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Lower Third Molar Region / Región del Tercer Molar Inferior  

Scientific Electronic Library Online (English)

Full Text Available La región del tercer molar inferior es una región importante para la práctica odontoestomatológica, en ella se presenta una gran cantidad de procesos patológicos relacionados con el desarrollo y erupción del tercer molar, por lo que se practican un gran número de intervenciones quirúrgicas. No obsta [...] nte su importancia, esta región no se encuentra considerada en la terminología anatómica ni descrita en la anatomía topográfica y a pesar de la gran cantidad de estudios que analizan la anatomía quirúrgica de la región, es necesario sistematizar la descripción de sus límites, planos, contenidos, elementos de riesgo, puntos de reparo, etc., es por ello que el propósito de este artículo es revisar los conceptos modernos relacionados con la anatomía quirúrgica de la región del tercer molar inferior y proponer una descripción basada en estos conceptos. Abstract in english The lower third molar region is an important region for the odontostomatological practice, since it presents a great amount of pathological processes related to the development and eruption of the third molar; thus having a considerable number of surgical interventions. Despite its importance, this [...] region is not accounted for in anatomical terminology nor is it described in topographic anatomy; and in spite of the great number of studies that analyze the surgical anatomy of the region, it is necessary to systematize the description of its boundaries, planes, content, risk elements, anatomical repairs, etc.; therefore, the purpose of the present article is to review the modern concepts related to the surgical anatomy of the lower third molar region and to establish a description based on these concepts.

Iván, Suazo Galdames.

2012-09-01

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Eruption chronology of the first deciduous teeth in children born prematurely with birth weight less than 1500g / Cronologia de erupcao dos primeiros dentes deciduos em criancas nascidas prematuras com peso inferior a 1500g / Cronologia de erupcion de los primeros dientes deciduos en ninos nacidos prematuros y con peso al nacer inferior a 1500g  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Languages: English, Portuguese Abstract in portuguese Objetivo: Descrever a cronologia de erupção dos primeiros dentes decíduos em crianças prematuras com peso de nascimento menor que 1500g e comparar as diferenças entre os sexos e entre a adequação nutricional ao nascimento. Métodos: Estudo longitudinal com 40 crianças prematuras e de muito baix [...] o peso ao nascer, de ambos os sexos. Considerou-se dente erupcionado no momento em que a coroa atravessou a gengiva e passou a pertencer ao ambiente bucal. A comparação da cronologia de erupção quanto ao sexo e entre as crianças adequadas e não adequadas nutricionalmente ao nascer foi realizada com o teste t de Student, sendo significante p Abstract in spanish Objetivo: Describir la cronología de erupción de los primeros dientes deciduos en niños prematuros con peso al nacer inferior a 1500g y comparar las diferencias entre los sexos y entre la adecuación nutricional al nacer. Métodos: Estudio longitudinal con 40 niños prematuros y de muy bajo peso [...] al nacer, de ambos sexos. Se consideró diente erupcionado en el momento en que la corona atravesó la encía y pasó a pertenecer al ambiente bucal. La comparación de la cronología de erupción respecto al sexo y entre los niños adecuados y no adecuados nutricionalmente al nacer se realizó con la prueba t de Student. El nivel de significancia fue de 0,05. Resultados : La erupción del (los) primer(os) diente(s) tuvo lugar, en promedio, a los 11,00±2,06 meses de edad cronológica y con 9,61±1,91 meses de edad corregida para la prematuridad. Los primeros dientes erupcionados fueron los incisivos centrales inferiores (81 y 71). El promedio de erupción en el sexo masculino fue de 9,74±1,91 y, en el femenino, de 9,46±1,95 meses, ambas corregidas para la prematuridad (p=0,98). El promedio de erupción en los niños adecuados nutricionalmente al nacer fue de 10,05±1,36 meses y, en los pequeños, de 9,35±2,16, también corregidas para la prematuridad (p=0,07). Conclusiones: El promedio de edad de erupción de los primeros dientes corregido para la prematuridad fue de 9,61 meses. El sexo y la adecuación nutricional al nacer no alteraron la cronología de la erupción. Abstract in english Objective: To describe the eruption chronology of the first deciduous teeth in premature infants with birth weight less than 1500g and to compare it according to gender and nutritional status at birth. Methods: Longitudinal study including 40 low birth weight premature infants of both genders. [...] The tooth was considered erupted when the crown went through the gum and became part of the oral environment. The comparison of the eruption chronology in relation to gender and among children appropriate or small for gestational age was done by Student's t-test, being significant p

Pedro Garcia, F. Neto; Mario Cicero, Falcao.

2014-03-01

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Avaliação ortopantomográfica das angulações mesiodistais de caninos, pré-molares e molares inferiores com e sem a presença dos terceiros molares / Panoramic evaluation of the mesiodistal angulations of canine teeth, premolar and inferior molars with and without the presence of the third molars  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese OBJETIVOS: comparar os valores médios normais das angulações mesiodistais dentárias, propostos por Ursi, em 1989, com as angulações mesiodistais de caninos, pré-molares e molares inferiores em indivíduos com e sem a presença dos terceiros molares inferiores e idades entre 18 e 25 anos. Além disso, f [...] oram comparados os valores das angulações mesiodistais desses dentes nessas duas situações. MÉTODOS: foram utilizadas 40 radiografias ortopantomográficas de indivíduos, de ambos os gêneros, que não receberam tratamento ortodôntico, divididos em dois grupos: Grupo I, constituído por 20 radiografias que não apresentavam os terceiros molares inferiores; e Grupo II, formado por 20 radiografias com os terceiros molares inferiores presentes. RESULTADOS E CONCLUSÕES: a análise dos resultados e a análise estatística permitiram concluir que ambos os grupos exibiram pré-molares e molares inferiores mais angulados em sentido mesial, quando comparados à oclusão normal. Por outro lado, a angulação mesiodistal de caninos inferiores mostrou-se semelhante àquela apresentada em casos de oclusão normal. Os dois grupos, quando comparados entre si, exibiram semelhantes valores angulares dos caninos, pré-molares e molares inferiores, de modo que a presença dos terceiros molares não exerceu influência sobre essas angulações mesiodistais dentárias. Abstract in english AIM: To compare the normal mean values of the mesiodistal axial angulation, proposed by Ursi in 1989, with the mesiodistal axial angulation of canine teeth, premolar and inferior molars in individuals with and without the presence of the third inferior molars and ages between 18 and 25 years. Beside [...] s, the values of the mesiodistal axial angulation of these teeth were compared in these two situations. METHODS: Forty panoramic x-rays were used from individuals of both genders that didn't receive orthodontic treatment, divided in two groups: Group I, constituted by 20 x-rays that didn't present the third inferior molars, and Group II, formed by 20 x-rays with the presence of the third inferior molars. RESULTS AND CONCLUSIONS: The results analysis and the statistical analysis allowed to conclude that both Groups exhibited inferior premolar and molars more angled in mesial direction when compared to the normal occlusion. On the other hand, the mesiodistal axial angulation of inferior canine teeth was similar to the presented in cases of normal occlusion. The two groups, when compared amongst themselves, exhibited similar angular values of the canine teeth, premolar and inferior molars, so that the presence of the third molars didn't exercise influence on these dental angulations.

Rodrigo Castellazzi, Sella; Marcos Rogério de, Mendonça; Osmar Aparecido, Cuoghi.

2009-12-01

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Spatial Relationship between Mandibular Third Molars and Inferior Alveolar Nerve using a Volume Rendering Software  

Directory of Open Access Journals (Sweden)

Full Text Available Precise localization of the third molars in relation to the inferior alveolar nerve canal is critical from a clinical point of view and strongly affects the surgical treatment outcome. Recently, by using three-dimensional modeling software, the relationship of third molar root apices and inferior alveolar nerve canal can be better understood. In this study, the spatial relationship of two surgical sites of 19 impacted third molars with close relationship to the inferior alveolar nerve canal is described by using imaging data from a cone beam computed tomography system. This study aimed to investigate the ability of three-dimensional modeling of tooth-nerve relationship using the data imported to Amira 5.2.2 imaging software

Shahrokh Nasseri

2013-12-01

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Má oclusão de Classe I com biprotrusão e ausência dos primeiros molares inferiores Angle Class I malocclusion with bimaxillary dental protrusion and missing mandibular first molars  

OpenAIRE

O presente relato de caso descreve o tratamento ortodôntico de uma paciente de 24 anos de idade, portadora de má oclusão de Classe I de Angle, com protrusão dos incisivos superiores e inferiores, além de perda recente dos primeiros molares inferiores. O tratamento idealizado envolveu a exodontia dos primeiros pré-molares superiores, aliada ao fechamento dos espaços presentes na arcada inferior. O resultado obtido demonstra a necessidade de planos de tratamento individualizados e a impo...

Aldino Puppin Filho

2011-01-01

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Má oclusão de Classe I com biprotrusão e ausência dos primeiros molares inferiores Angle Class I malocclusion with bimaxillary dental protrusion and missing mandibular first molars  

Directory of Open Access Journals (Sweden)

Full Text Available O presente relato de caso descreve o tratamento ortodôntico de uma paciente de 24 anos de idade, portadora de má oclusão de Classe I de Angle, com protrusão dos incisivos superiores e inferiores, além de perda recente dos primeiros molares inferiores. O tratamento idealizado envolveu a exodontia dos primeiros pré-molares superiores, aliada ao fechamento dos espaços presentes na arcada inferior. O resultado obtido demonstra a necessidade de planos de tratamento individualizados e a importância dos conceitos biomecânicos para movimentar adequadamente os dentes. Esse caso clínico foi apresentado à Diretoria do Board Brasileiro de Ortodontia e Ortopedia Facial (BBO, representando a categoria livre escolha, como parte dos requisitos para obtenção do título de Diplomado pelo BBO.This case report describes the orthodontic treatment of a 24-year-old patient presenting with Angle Class I malocclusion, bimaxillary dental protrusion and recent loss of mandibular molars. Treatment involved extraction of the maxillary first premolars and closing of mandibular first molar spaces. Treatment outcomes demonstrate the need for individualized treatment planning and highlight the key role played by biomechanical concepts in achieving proper orthodontic tooth movement. This case was presented to the Brazilian Board of Orthodontics and Facial Orthopedics (BBO as representative of the free choice category in partial fulfillment of the requirements for obtaining the BBO Diploma.

Aldino Puppin Filho

2011-12-01

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Má oclusão de Classe I com biprotrusão e ausência dos primeiros molares inferiores / Angle Class I malocclusion with bimaxillary dental protrusion and missing mandibular first molars  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Languages: English, Portuguese Abstract in portuguese O presente relato de caso descreve o tratamento ortodôntico de uma paciente de 24 anos de idade, portadora de má oclusão de Classe I de Angle, com protrusão dos incisivos superiores e inferiores, além de perda recente dos primeiros molares inferiores. O tratamento idealizado envolveu a exodontia dos [...] primeiros pré-molares superiores, aliada ao fechamento dos espaços presentes na arcada inferior. O resultado obtido demonstra a necessidade de planos de tratamento individualizados e a importância dos conceitos biomecânicos para movimentar adequadamente os dentes. Esse caso clínico foi apresentado à Diretoria do Board Brasileiro de Ortodontia e Ortopedia Facial (BBO), representando a categoria livre escolha, como parte dos requisitos para obtenção do título de Diplomado pelo BBO. Abstract in english This case report describes the orthodontic treatment of a 24-year-old patient presenting with Angle Class I malocclusion, bimaxillary dental protrusion and recent loss of mandibular molars. Treatment involved extraction of the maxillary first premolars and closing of mandibular first molar spaces. T [...] reatment outcomes demonstrate the need for individualized treatment planning and highlight the key role played by biomechanical concepts in achieving proper orthodontic tooth movement. This case was presented to the Brazilian Board of Orthodontics and Facial Orthopedics (BBO) as representative of the free choice category in partial fulfillment of the requirements for obtaining the BBO Diploma.

Aldino, Puppin Filho.

2011-12-01

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Variations of interleukin-6 after surgical removal of lower third molars / Variaciones de la interleuquina-6 tras la cirugía del tercer molar inferior  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: English Abstract in spanish Objetivos: Determinar si tras la cirugía del tercer molar inferior se produce una liberación de interleuquina-6 (IL-6) y comparar la cantidad de IL-6 en pacientes que tomaron AINES y en aquellos que tomaron glucocorticoides. Diseño del estudio: Estudio prospectivo sobre 73 pacientes sometidos a la e [...] xtracción quirúrgica de los terceros molares inferiores. Fueron divididos en dos grupos: De diclofenaco y de metilprednisolona. Se recogieron muestras de fluído crevicular gingival para valorar la liberación de interleuquina-6 tras la cirugía. Se usó el programa estadístico BMDP para hacer un amplio tratamiento de los datos. Resultados: Los niveles de IL-6 se elevaron tras la cirugía del tercer molar inferior permaneciendo elevados al séptimo día del postoperatorio, elevándose más a las 24 horas en el grupo de diclofenaco siendo esta diferencia significativa (0,008). Conclusiones: La IL-6 se eleva tras la cirugía del tercer molar inferior, presentando diferente comportamiento en los dos grupos de estudio. Abstract in english Objectives: To determine if there is a release of IL-6 after surgical removal of lower third molars and to compare the amount of IL-6 in patients treated with NSAID and in those treated with glucocorticoids. Study Design: Prospective study on 73 patients who attended the Oral Surgery Unit (Departmen [...] t of Medicine and Oral Surgery) in the Faculty of Odontology of the Universidad Complutense de Madrid for the surgical removal of their lower third molars. These patients were separated into two groups: the diclofenac group and the methylprednisolone group. A record card was completed with preoperative and postoperative epidemiological and clinic data. Samples of gingival crevicular fluid were collected in order to assess the release of interleukin-6 after surgery. In order to make a broad study of data, the BMDP program was used for statistical analysis. Results: Levels of IL-6 were higher after surgical extraction of lower third molars and remained high until the seventh day after. Levels were higher in the diclofenac group 24 hours after surgery, the difference was significant (0.008). Conclusions: IL-6 is higher after surgical extraction of lower third molars, behaving differently in each of the groups.

Carmen, López Carriches; José Mª, Martínez-González; Manuel, Donado Rodríguez.

2006-12-01

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Una rara complicación en la extracción del tercer molar inferior incluido: Caso clínico / A rare complication during the extraction of the included inferior third molar: Case report  

Scientific Electronic Library Online (English)

Full Text Available Presentamos una rara complicación ocurrida tras el intento de extracción del tercer molar incluido en una consulta odontológica bajo anestesia local. El paciente requirió ingreso en el servicio de urgencias para la extracción, de forma urgente, de la pieza a través de un abordaje cervical bajo anest [...] esia general e intubación nasaotraqueal por desplazamiento de la pieza hacia la fosa submandibular durante el intento de extracción ambulatoria. El paciente presentó signos evidentes de inflamación en la región submandibular con desplazamiento de la vía aérea hacia el lado opuesto. Las complicaciones derivadas de la cirugía del tercer molar son, en algunos casos, mortales y pueden aparecer tras un acto quirúrgico aparentemente de bajo riesgo. Estas complicaciones han sido ampliamente descritas en la literatura. Aún así consideramos importante el presentar complicaciones poco frecuentes en la cirugía del tercer molar ya que esto nos permitirá conocerlas y ofrecer la mejor solución en cada caso. Abstract in english We present a rare complication that appeared after an attempt to extract the included third molar with local anaesthesia at the odontologist office. The patient was admitted to the emergency room to have the tooth removed cervically under general anaesthesia and nasotracheal tubation because of its [...] movement towards the submandibular fossa during the ambulatory extraction attempt. The patient showed evident signs of swelling in submandibular region and the airway was displaced towards the opposite side. The resulting complications from the third molar surgery are, in some cases, mortal and can occur after an apparently low risk surgery. These complications have been thoroughly described in literature. Still, we consider it important to describe infrequent complications of third molar surgery because it will allow us to know more about them and offer the best solution in every case.

S., Aboul-Hosn Centenero; R., Sieira Gil; A., Monner Diéguez.

2009-10-01

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Cleaning and decompression of inferior alveolar canal to treat dysesthesia and paresthesia following endodontic treatment of a third molar.  

Science.gov (United States)

Endodontic overfilling involving the mandibular canal may cause an injury of the inferior alveolar nerve (IAN). We report a case of disabling dysesthesia and paresthesia of a 70-year-old man after endodontic treatment of his mandibular left third molar that caused leakage of root canal filling material into the mandibular canal. After radiographic evaluation, extraction of the third molar and distal osteotomy, a surgical exploration was performed and followed by removal of the material and decompression of the IAN. The patient reported an improvement in sensation and immediate disappearance of dysesthesia already from the first postoperative day. PMID:25099006

Scala, Rudy; Cucchi, Alessandro; Cappellina, Luca; Ghensi, Paolo

2014-01-01

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A influência da perda bilateral do primeiro molar inferior permanente na morfologia dentofacial: um estudo cefalométrico / The influence of bilateral lower first permanent molar loss on dentofacial morfology: a cephalometric study  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Languages: English, Portuguese Abstract in portuguese OBJETIVO: avaliar as alterações cefalométricas em pacientes com perda bilateral do primeiro molar inferior permanente. MÉTODOS: foram analisadas 68 telerradiografias laterais de pacientes de consultórios particulares. A amostra foi dividida em dois grupos pareados quanto ao sexo e idade - 34 indivíd [...] uos sem perdas (grupo controle) e 34 com perda bilateral do primeiro molar inferior permanente (grupo com perda). Foram excluídos da amostra pacientes que haviam perdido outros dentes que não o primeiro molar inferior, casos de agenesia e pacientes com menos de 16 anos de idade. Buscou-se avaliar somente indivíduos que tivessem relatado a perda há pelo menos 5 anos. RESULTADOS: demonstraram que a perda bilateral do primeiro molar inferior permanente leva ao suave fechamento do ângulo GnSN (P=0,05), um giro anti-horário do plano oclusal (P=0,0001), uma suave diminuição da altura facial anteroinferior (P=0,05), uma acentuada inclinação lingual (P=0,04) e retrusão dos incisivos inferiores (P=0,03). Por outro lado, a perda bilateral do primeiro molar inferior permanente não foi capaz de influenciar a relação maxilomandibular no sentido anteroposterior (P=0,21), a quantidade de mento (P=0,45), a inclinação dos incisivos superiores (P=0,12) e a posição anteroposterior dos incisivos superiores (P=0,46). CONCLUSÃO: a perda bilateral dos primeiros molares inferiores é capaz de produzir alterações marcantes no posicionamento dos incisivos inferiores e no plano oclusal, além de uma suave redução vertical da face Abstract in english OBJECTIVE: To evaluate cephalometric changes in patients after bilateral loss of lower first permanent molar teeth. METHODS: Sixty-eight lateral radiographs of patients from private practices were analyzed. The sample was divided into two groups matched for age and gender: 34 individuals without los [...] s (control group) and 34 presenting with bilateral loss of lower first permanent molar teeth (loss group). Patients who had lost teeth other than first molars, cases of agenesis and patients under 16 years of age were excluded from the sample. Only individuals who reported losing teeth at least 5 years earlier were evaluated. RESULTS: It was found that bilateral loss of lower first permanent molars leads to smooth closure of GnSN angle (P=0.05), counterclockwise rotation of occlusal plane (P=0.0001), mild decrease in lower anterior face height (P=0.05), pronounced lingual tipping (P=0.04) and retrusion of mandibular incisors (P=0.03). Moreover, bilateral loss of lower first permanent molars did not affect the maxillomandibular relationship in the anteroposterior direction (P=0.21), amount of treatment (P=0.45), inclination of upper incisors (P=0.12) and anteroposterior position of maxillary incisors (P=0.46). CONCLUSION: Bilateral loss of lower first molars can produce marked changes in lower incisor positioning and in the occlusal plane as well as a mild reduction of the face in the vertical direction

David, Normando; Cristina, Cavacami.

2010-12-01

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Correlation between radiographic signs of third molar proximity with inferior alveolar nerve and postoperative occurrence of neurosensory disorders: A prospective, double-blind study  

OpenAIRE

PURPOSE: To evaluate the interference of radiographic factors in the appearance of sensory deficit related to inferior alveolar nerve (IAN) after third molars (3Ms) removal. METHODS: A prospective, double-blind, observational, unicentric study was performed with 126 patients submitted to a surgical procedure of lower 3Ms removal in the period from March to October/2011. Collected data included gender, age, eruption stage of 3Ms, position/angle of 3Ms (Pell-Gregory and Winter classifications, ...

Fábio Wildson Gurgel Costa; Erick Helton Lima Fontenele; Tácio Pinheiro Bezerra; Thyciana Rodrigues Ribeiro; Bárbara Gressy Duarte Souza Carneiro; Eduardo Costa Studart Soares

2013-01-01

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Piezoelectric bone surgery in the treatment of an osteoma associated with an impacted inferior third molar: a case report.  

Science.gov (United States)

Operative removal of impacted mandibular third molars is a common and not riskless surgical procedure. We present an emblematic case of an osteoma closely associated with an impacted third left mandibular molar treated by Mectron Piezosurgery medical ultrasonic device. PMID:25002883

D'Amato, Salvatore; Sgaramella, Nicola; Vanore, Laura; Piombino, Pasquale; Orabona, Giovanni Dell'Aversana; Santagata, Mario

2014-01-01

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Desplazamiento accidental hacia el espacio parafaríngeo de un fragmento de un tercer molar inferior retenido Accidental displacement of a fragment of a retained lower third molar towards the parapharyngeal space  

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Full Text Available La extracción quirúrgica de los terceros molares retenidos es la operación realizada con más frecuencia por los cirujanos maxilofaciales, incluso de forma profiláctica, y se asocia con complicaciones trans y posoperatorias. Se presenta un caso con desplazamiento de un fragmento del tercer molar inferior izquierdo durante su exéresis quirúrgica hacia el espacio parafaríngeo, que resulta raro tanto por su frecuencia como por el tratamiento utilizado en esta complicación, pues se han reportado muy pocos casos en la literatura internacional y ninguno en nuestro país.The surgical removal of the retained third molars is the most common surgery performed by maxillofacial surgeons, even in a prophylactic way, and it is associated with trans- and postoperative complications. A case with displacement of a fragment of the left lower third molar towards the parapharyngeal space during its surgical exeresis is presented. It is a rare case due to its frequency and to the treatment used in this complication, since a few cases have been reported in international literature and none in our country.

Yudit Algozaín Acosta

2008-03-01

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Comparación del postoperatorio de dos colgajos en cirugía de terceros molares inferiores / Post operative comparison of two flap designs in lower third molar surgery  

Scientific Electronic Library Online (English)

Full Text Available La cirugía de terceros molares constituye en la práctica de la cirugía oral y maxilofacial, una de las intervenciones más realizadas. Las indicaciones son variadas, desde medidas profilácticas hasta grandes lesiones osteolíticas. Algunas de las consecuencias después de dicha intervención son; edema, [...] trismus y dolor postoperatorio. En la técnica quirúrgica, el colgajo cobra gran importancia a la hora de minimizar estas consecuencias. El objetivo del presente estudio es evaluar el postoperatorio de la cirugía de terceros molares mandibulares incluidos, utilizando un colgajo lineal en un lado y un colgajo triangular en el otro lado del mismo paciente. Se realizó un estudio prospectivo en 15 pacientes de la Facultad de Odontología de la Universidad Mayor. Se tomaron registros fotográficos estandarizados y se midió la apertura bucal máxima pre-quirúrgica de cada paciente. Se registró el edema, la limitación de apertura bucal y el dolor a las 48 horas y a los 7 días, además del tiempo intraoperatorio. Todos los datos fueron analizados estadísticamente. No existen diferencias significativas en el edema, limitación de la apertura ni dolor al utilizar ambos colgajos. Tampoco existe correlación entre el tiempo operatorio y las tres variables estudiadas. El postoperatorio de la cirugía de terceros molares mandibulares incluidos es similar al utilizar un colgajo lineal o un colgajo triangular. El cirujano puede optar por uno o el otro indistintamente, según su preferencia. Abstract in english One of the most common procedures in the field of Oral and Maxillofacial Surgery is third molar surgery. From prophylactic measures to large osteolytic lesions, there are various indications. Some of the consequences of this procedure are; edema, trismus and postoperative pain. Flap design is an imp [...] ortant feature of surgical technique that plays a vital role in minimizing these consequences. The objective of this study is a post operative evaluation of included third molar jaw surgery using a linear flap on one side and a triangular flap on the other side of the same patient. A prospective study of 15 patients from the Dentistry College at the Major University was carried out. Before surgery standard photos were taken and maximum oral opening was measured for each patient. The edema, maximum oral opening and pain were measured 48 hours and 7 days after surgery. All of the data were analyzed statistically. There are no significant differences in the edema, ability to open the mouth or the level of pain using the two types of flap. There also is no correlation between the operation time and the three variables studied. The postoperative edema, pain and trismus after included third molar surgery are similar when using linear or triangular flap designs. The surgeon can choose one or the other indistinctly, according to his/her preference.

G., Laissle Casas del Valle; P., Aparicio Molares; F., Uribe Fenner; D., Alcocer Carvajal.

2009-06-01

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Diagnostic Accuracy of Panoramic Radiography in Determining the Position of Impacted Third Molars in Relation to the Inferior Dental Canal Compared with Surgery  

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Full Text Available Background/Objective: Extraction of the third lower molar tooth is one of the common surgical procedures that may lead to the damage of the infra-alveolar nerve. This damage could be related to deep impacted third molar teeth and roots close to the mandibular canal. Therefore, the radiography evaluation of the position of this tooth in relation to the inferior dental canal is important before surgery."nPatients and Methods: In this cross-sectional descriptive study, 59 patients who were referred to maxillofacial surgeons for third molar tooth surgery, and had a panoramic radiography were enrolled into the study. The positions of the impacted teeth in the panoramic radiography were determined according to their relation to the mandibular canal and were reported as five different subgroups (A, B, C, D and E. Cases which were not classified in any of these subgroups were considered as F. The surgeon also determined the position of the impacted teeth after surgery based on the mentioned classification. To assess the correlation of the data, Kappa analysis was used."nResults: Kappa statistics for agreement between radiography and surgery was 0.85 (p<0.001."nConclusion: According to this study, radiological assessment before third molar tooth surgery can reduce the risk of conceivable damage to the canal and nerve. It is recommended to consider the radiologists opinion before surgery.    

F Ezoddini Ardakani

2010-10-01

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Variables preoperatorias e intraoperatorias asociadas al aumento del tiempo quirúrgico en la exodoncia de terceros molares inferiores / Pre-surgical and surgical factors related to increase of surgical time in lower third molar remove  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: Spanish Abstract in spanish Introducción: La exodoncia de tercer molar es un procedimiento frecuente en odontología, lo que exige conocer los factores que pueden anticipar el tiempo quirúrgico y sus características. El objetivo de esta investigación es conocer los factores asociados al aumento del tiempo quirúrgico (ATQ) en la [...] exodoncia de terceros molares inferiores (3M). Material y método: 145 sujetos de entre 15 y 40 años fueron seleccionados desde tres centros quirúrgicos de Temuco (Chile), en los que fueron realizados 158 cirugías; todos los pacientes consultaron por exodoncia de tercer molar siendo operados en tales centros. Las variables del paciente, del diente y de la cirugía fueron estudiadas; la información fue analizada con el paquete estadístico Stata 9.1, empleando en test de Fisher y chi cuadrado con p Abstract in english Introduction: Everyday, the third molar's surgery is more frequent. That fact makes necessary to know the factors that allow to anticipate the surgical time and its characteristics. The aim of this research was to know the pre-surgical and surgical factors associated with the increase of the surgica [...] l time (IST) of the mandibular third molar (3M)'s surgery. Methodology: 145 subjects between the 15-40 years-oldwere selected from three surgical centers of Temuco (Chile). In this enclousures 158 surgeries were realized. All of the patients consulted by a 3M' s surgery, being put under surgical extraction in this centers. Variables from the patients, tooth and surgery itself were studied. The information were analyzed in the Stata 9.1 statistical package, utilizing the Fisher Test and Chi-Square Test,with p

S., Olate; J.P., Alister; R., Alveal; M., Soto; H.D., de Miranda Chaves Netto; D., Thomas.

2012-12-01

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Electromyographic Study of the Masseter Muscle after Lower Third Molar Surgery Estudio Electromiográfico del Músculo Masetero tras Cirugía de Tercer Molar Inferior  

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Full Text Available Third molar extraction surgery is one of the most frequently performed procedures in the areas of buccal-maxillofacial traumatology and surgery. The post-surgery evolution was evaluated based on the clinical evidence obtained so far. The objective of this study was to analyze the post-surgery clinical evolution of the masseter muscle by means of surface electromyography, to evaluate muscle activity. Four analyses were performed: one pre-surgery, to register the normal activity, and three in post-surgery: on the 7th, 14th and 21st postoperative days, in a sample of 30 patients. On the 21st day, there was near normal recovery of the electrical signal of the masseter in women, but in men this activity did not reach normal levels. Surface electromyography is a safe and reliable tool for post-surgery evolution control of masseter function.La cirugía de extracción del tercer molar es uno de los procedimientos realizados con mayor frecuencia en las áreas de traumatología y cirugía buco-maxilofacial. La evolución post-quirúrgica fue evaluada sobre la base de la evidencia clínica obtenida hasta el momento. El objetivo de este estudio fue analizar la evolución clínica post-operatoria del músculo masetero por medio de electromiografía de superficie, para evaluar la actividad muscular. Fueron realizados cuatro análisis: uno previo a la cirugía, para registrar la actividad normal, y tres en la post-quirúrgica: en el día del 7, 14 y 21 postoperatorio, en una muestra de 30 pacientes. El día 21, hubo recuperación cercana a la normal de la señal eléctrica del músculo masetero en las mujeres, pero en los hombres esta actividad no alcanzó los niveles normales. La electromiografía de superficie es una herramienta segura y fiable para el control de la evolución post-quirúrgica de la función del músculo masetero.

Tarley Eloy Pessoa de Barros

2011-03-01

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Segundo y tercer molar inferior izquierdo impactados. Presentación de un caso / Impacted second and third lower left molar. A case report  

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Full Text Available Introducción: los dientes impactados presentan variadas formas de presentación en cuanto a posición, diente involucrado y complicaciones asociadas. Objetivo: mostrar un caso poco frecuente de impactación de dientes continuos con las complicaciones y posibilidades terapéuticas implementadas. Presenta [...] ción del caso: presentamos el caso de una paciente femenina, 17 años, quien acude a la clínica de cirugía de la Facultad de Estomatología, en IBB, República de Yemen, por presentar dolor en hemiarcada inferior izquierda, al examen clínico se aprecia, 37 parcialmente erupcionado y ausencia de 38 en cavidad bucal. Se completa estudio con análisis radiográfico diagnosticando retención del 37 y 38, se decide exéresis quirúrgica del 37 y seguimiento de erupción del 38, asociado a terapéutica conservadora del 36 con severa lesión cariosa. Conclusiones: la valoración integral del paciente en casos de retenciones múltiples se hace necesaria para lograr el equilibrio funcional y estético como los obtenidos en casos como este. Abstract in english Introduction: the impacted teeth have several forms of presentation in position, involved tooth, and associated complications. Objective: to show an unfrequented case of impactation in neighbor teeth, with its complications and therapeutic solutions. Presentation of the case: the case is a female pa [...] tient, 17 years old, who came to service of surgery of dentistry college of IBB university, Yemen; due to she felt pain in left inferior dental arcade, in the clinical examination was observed the 37 partially erupted, and absent of the 38 in the oral cavity. A radiographic exam was done, diagnosing retention in 37 and 38. Surgical extraction of 37 was done and the eruption follows up of the 38, in association with a conservative treatment in the 36 due to severe carious lesion. Conclusions: the integral assessment is necessary in all patient with multiple retention to get the functional and aesthetic equilibrium like a result obtained in this case.

Luis, Hernández Pedroso.

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Variables preoperatorias e intraoperatorias asociadas al aumento del tiempo quirúrgico en la exodoncia de terceros molares inferiores Pre-surgical and surgical factors related to increase of surgical time in lower third molar remove  

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Full Text Available Introducción: La exodoncia de tercer molar es un procedimiento frecuente en odontología, lo que exige conocer los factores que pueden anticipar el tiempo quirúrgico y sus características. El objetivo de esta investigación es conocer los factores asociados al aumento del tiempo quirúrgico (ATQ en la exodoncia de terceros molares inferiores (3M. Material y método: 145 sujetos de entre 15 y 40 años fueron seleccionados desde tres centros quirúrgicos de Temuco (Chile, en los que fueron realizados 158 cirugías; todos los pacientes consultaron por exodoncia de tercer molar siendo operados en tales centros. Las variables del paciente, del diente y de la cirugía fueron estudiadas; la información fue analizada con el paquete estadístico Stata 9.1, empleando en test de Fisher y chi cuadrado con pIntroduction: Everyday, the third molar's surgery is more frequent. That fact makes necessary to know the factors that allow to anticipate the surgical time and its characteristics. The aim of this research was to know the pre-surgical and surgical factors associated with the increase of the surgical time (IST of the mandibular third molar (3M's surgery. Methodology: 145 subjects between the 15-40 years-oldwere selected from three surgical centers of Temuco (Chile. In this enclousures 158 surgeries were realized. All of the patients consulted by a 3M' s surgery, being put under surgical extraction in this centers. Variables from the patients, tooth and surgery itself were studied. The information were analyzed in the Stata 9.1 statistical package, utilizing the Fisher Test and Chi-Square Test,with p<0,05 for statistical significance. Results: The surgical time used in the surgery was minorof 20 minutes in the 50% of the cases and minor of de 30 minutes in the 75 % ofthe cases. The patient's age, the molar's position, the presence of pericoronaritis and the 3M' s root anatomy were significantly associated with a IST (p<0,05, of equal way the flap elevation, osteotomy and coronal orroot section had statistical significance with IST (p<0,05. Conclusion: Factors like the patient's age, molar'sposition, surgeon's experience, pericoronaritis and the root fussion contribute significantly to and IST.

S. Olate

2012-12-01

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Correlation between radiographic signs of third molar proximity with inferior alveolar nerve and postoperative occurrence of neurosensory disorders: A prospective, double-blind study  

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Full Text Available SciELO Brazil | Language: English Abstract in english PURPOSE: To evaluate the interference of radiographic factors in the appearance of sensory deficit related to inferior alveolar nerve (IAN) after third molars (3Ms) removal. METHODS: A prospective, double-blind, observational, unicentric study was performed with 126 patients submitted to a surgical [...] procedure of lower 3Ms removal in the period from March to October/2011. Collected data included gender, age, eruption stage of 3Ms, position/angle of 3Ms (Pell-Gregory and Winter classifications, respectively), presence/absence of radiographic signs of 3Ms proximity with the inferior alveolar canal and surgical technique. Occurrence evaluation of the IAN injury was performed on the seventh postoperative day through pin-prick, two-point discrimination and brush directional stroke tests. RESULTS: Predominant radiographic signs were: narrowing of the inferior alveolar canal (68.25%), darkening of root (46.82%) and diversion of the canal (31%). None of the patients presented sensory loss. Sixty-one (48.41%) of the cases had at least one or two radiographic signs of proximity with NAI. Forty-seven (37.3%) had 3 or more signs, and 18 (14.29%) did not have any radiographic signs of proximity to mandibular canal. CONCLUSION: There was not a positive correlation between presence of radiographic signs of 3Ms with IAN proximity and postoperative neurosensory disorders occurrence.

Fábio Wildson Gurgel, Costa; Erick Helton Lima, Fontenele; Tácio Pinheiro, Bezerra; Thyciana Rodrigues, Ribeiro; Bárbara Gressy Duarte Souza, Carneiro; Eduardo Costa Studart, Soares.

2013-03-01

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Antibioterapia sistémica preventiva de la alveolitis seca en la exodoncia del tercer molar inferior: revisión sistemática / Systemic antibiotherapy in the prevention of dry socket in lower third molar exodontia: systematic review  

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Full Text Available SciELO Spain | Language: Spanish Abstract in spanish Introducción: El objetivo de esta revisión sistemática es responder a la pregunta: ¿son eficaces los antibióticos sistémicos en la cirugía del tercer molar inferior para reducir la frecuencia de alveolitis seca?. Método: Búsqueda bibliográfica, sin limitaciones, en repertorios y bases de datos infor [...] máticas. Criterios inclusión: exposición (antibioterapia sistémica), efecto (alveolitis seca) y diseño (ensayos clínicos aleatorizados- evidencia I). Se evaluaron la validez de los estudios primarios según la síntesis de la mejor evidencia disponible (escala Jadad) y los componentes individuales. De los ensayos seleccionados se verificó la validez externa de sus conclusiones. Resultados: Once ensayos clínicos cumplían los criterios de inclusión y obtuvieron puntuación = 1 en la escala de Jadad. En ninguno de los estudios se realizó análisis por intención de tratar. Sólo en uno se analizó la potencia y cálculo previo del tamaño muestral, y en dos el intervalo de confianza. Conclusión: No existe evidencia a favor o en contra de la eficacia de la antibioterapia sistémica preventiva en la exodoncia de los cordales inferiores. Abstract in english Introduction: The objective of this systematic review is to provide an answer to the question: Is the frequency of dry socket in lower third molar surgery reduced with efficacy using systemic antibiotics?. Method: Unlimited bibliographic search in repertories and computer databases. Inclusion criter [...] ia: exposure (systemic antibiotherapy), effect (dry socket) and design (randomised clinical trials -evidence I-). Validity of the preliminary studies was assessed according to the synthesis of the best available evidence (Jadad scale) and individual components. From the trials chosen, the external validity of their conclusions was verified. Results: Eleven clinical trials complied with the inclusion criteria obtaining = 1 points on the Jadad scale. Intention to treat analysis was not performed on any of the studies. Power analysis and preliminary calculation of the sample size was performed on only one, whereas the confidence interval was performed on two. Conclusion: There is no evidence for or against the efficacy of systemic preventive antibiotherapy in lower third molar exodontia.

María Iciar, Arteagoitia Calvo; María Antonia, Diez García; Luis, Barbier Herrero; Salvador, Landa Llona; Gorka, Santamaría Arrieta; Joseba, Santamaría Zuazua.

2002-12-01

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Comparative study of the anesthetic efficacy of 4% articaine versus 2% lidocaine in inferior alveolar nerve block during surgical extraction of impacted lower third molars  

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Full Text Available SciELO Spain | Language: English Abstract in spanish Objetivo: Valorar y comparar la eficacia anestésica de la Articaína al 4% respecto a la Lidocaína al 2%, ambas con una concentración de 1:100.000 de epinefrina en el bloqueo troncal del nervio alveolar inferior durante la extracción quirúrgica de terceros molares inferiores incluidos. Diseño del est [...] udio: Se realizó un ensayo clínico aleatorio a doble ciego en una muestra de 30 pacientes programados para las extracciones quirúrgicas bilaterales de terceros molares inferiores simétricos en el Servicio de Cirugía Bucal del Máster de Cirugía e Implantología Bucal de la Universidad de Barcelona. Previo consentimiento del paciente, dos operadores efectuaron las intervenciones quirúrgicas de forma extemporánea, utilizando como anestésico local la Articaína al 4% o la Lidocaína al 2 % con la misma concentración de vasoconstrictor (epinefrina 1:100.000). Las variables estudiadas para cada anestésico fueron: tiempo de latencia (o de inicio del efecto anestésico), duración del efecto anestésico, cantidad de solución anestésica utilizada y la necesidad de reanestesiar la zona operatoria. Se utilizó una escala analógica visual para valorar la cantidad de dolor experimentado durante el acto quirúrgico y, así, evaluar subjetivamente la profundidad anestésica de las dos soluciones. Resultados: Se observaron diferencias estadísticamente significativas (p= .003) en cuanto a la duración del efecto anestésico, que fue mayor para la artcaína al 4% (220,8 minutos), respecto a la lidocaína al 2% (168,20 minutos). En las variables tiempo de latencia, cantidad de solución anestésica utilizada y necesidad de reanestesiar el campo operatorio se evidenciaron diferencias clínicas a favor de la articaína, aunque estas diferencias no fueron estadísticamente significativas. La valoración cualitativa de los anestésicos mediante la escala analógica visual mostró similitud en el dolor experimentado por los pacientes con ambos anestésicos. Conclusiones: De acuerdo con los resultados obtenidos se puede afirmar que la articaína al 4% muestra mejores características clínicas que la lidocaína al 2%, especialmente en cuanto al tiempo de latencia y duración del efecto anestésico. Sin embargo, no hubieron diferencias estadísticamente significativas que confirmen la superioridad de una solución respecto a la otra, al valorar la eficacia anestésica. Abstract in english Background: A comparative study is made of the anesthetic efficacy of 4% articaine versus 2% lidocaine, both with epinephrine 1:100,000, in truncal block of the inferior alveolar nerve during the surgical extraction of impacted lower third molars. Study design: A randomized double-blind clinical tri [...] al was conducted of 30 patients programmed for the bilateral surgical extraction of symmetrical lower third molars in the context of the Master of Oral Surgery and Implantology (University of Barcelona, Barcelona, Spain). Following the obtainment of informed consent, two operators performed surgery on an extemporaneous basis, using as local anesthetic 4% articaine or 2% lidocaine with the same concentration of vasoconstrictor (epinephrine 1:100,000). The study variables for each anesthetic were: latency (time to action) and duration of anesthetic effect, the amount of anesthetic solution used, and the need of re-anesthetize the surgical zone. A visual analog scale was used to assess pain during surgery, and thus subjectively evaluate the anesthetic efficacy of the two solutions. Results: Statistically significant differences (p = 0.003) were observed in the mean duration of anesthetic effect (220.86 min. for 4% articaine vs. 168.20 min. for 2% lidocaine). Latency, the amount of anesthetic solution and the need to re-anesthetize the surgical field showed clinical differences in favor of articaine, though statistical significance was not reached. The pain scores indicated similar anesthetic efficacy with both solutions. Conclusions: The results obtained suggest that 4

Alejandro, Sierra Rebolledo; Esther, Delgado Molina; Leonardo, Berini Aytés; Cosme, Gay Escoda.

2007-03-01

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Using an operating microscope to re-treat an inferior premolar with two canals / Uso do microscópio operatório no retratamento de um pré-molar inferior com dois canais  

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Full Text Available O artigo tem como objetivo apresentar um caso clínico de retratamento endodôntico realizado em um pré-molar inferior esquerdo com dois canais de difícil localização, onde é discutida a importância dos conhecimentos anatômicos e o uso do microscópio operatório, sobretudo em reintervenções complexas. [...] Realizou-se um retratamento endodôntico no elemento 34, possuidor de restauração protética e fístula por vestibular. No exame clínico, constatou-se resultado negativo ao teste de sensibilidade e resultado positivo ao teste de percussão vertical. Após remoção de todo o material obturador existente, o microscópio operatório foi solicitado para avaliação de uma possível fratura ou presença de outro canal. Foi constatada a presença de outro canal, o qual foi tratado e obturado como o já existente. Após 12 meses, novo exame radiográfico foi feito e constatou-se normalidade radiográfica e assintomatologia. Em casos mais complexos e com anatomia peculiar torna-se imprescindível a utilização do microscópio operatório no auxílio à localização de um canal extra para o sucesso do tratamento. Abstract in english This report aims to present a clinical case of endodontic re-treatment performed on a left inferior premolar with two canals of difficult localization. The importance of anatomical knowledge and the use of an operating microscope, especially in complex reintervention are discussed. An endodontic re- [...] treatment was performed on element 34, which had a prosthetic restoration and vestibular fistula. In clinical examination, it was observed a negative result to the sensitization test and a positive result to vertical percussion test. After all the obturating material was removed, an operating microscope was requested to assess a possible fracture or the presence of another canal. It was noticed the presence of another canal that was treated and obturated as the existing canal. After 12 months, a new radiographic exam was performed, whose result was found asymptomatic and radiographically normal. In complex peculiar anatomy cases, the operating microscope is vital for the localization of extra canal to guarantee treatment success.

Janaína Fernandes, SANTOS; Gustavo Moreira, ALMEIDA; Eduardo Fernandes, MARQUES; Carlos Eduardo da Silveira, BUENO.

2014-12-01

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Estudo comparativo entre dois protocolos anestésicos envolvendo bloqueio do nervo alveolar inferior convencional e de Vazirani-Akinosi para exodontia de terceiro molar inferior / Comparative study of two anaesthetic protocols involving conventional and Vazirani-Akinosi alveolar inferior nerve block for lower third molar extraction  

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Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese INTRODUÇÃO: O bloqueio do nervo alveolar inferior (BNAI) apresenta alta porcentagem de falha na Odontologia. A fim de melhorar esse índice, vêm-se estudando diferentes alternativas, como diferentes técnicas e soluções anestésicas. OBJETIVO: Avaliar duas diferentes técnicas - técnica convenciona [...] l e de Vazirani-Akinosi - para o bloqueio do nervo alveolar inferior, bem como compará-las quanto à sua efetividade e quantificar o percentual de aspirações positivas nas duas diferentes técnicas. MATERIAL E MÉTODO: Foram avaliados 160 pacientes de ambos os sexos, sendo 80 submetidos ao bloqueio do nervo alveolar inferior de Vazirani-Akinosi e bloqueio do nervo bucal (G1), e 80 submetidos ao bloqueio do nervo alveolar inferior convencional e ao bloqueio do nervo bucal (G2). Em ambos os grupos, utilizou-se a combinação de articaína 4% com epinefrina 1:100.000 para bloqueio do nervo bucal, e lidocaína 2% com epinefrina 1:100.000 para bloqueio do nervo alveolar inferior. Foram avaliados: a quantidade de aspirações positivas, a eficácia da anestesia e o momento em que ocorreu a falha anestésica durante o procedimento cirúrgico. RESULTADO: Não houve diferenças estatisticamente significantes (p = 0,2453) entre os grupos G1 e G2 observando-se a eficácia e o índice de aspirações positivas, e o momento em que ocorreu a falha anestésica, observando-se uma maior eficácia de ambas as técnicas, quando comparadas com a literatura (90%) CONCLUSÃO: Não houve diferença significativa entre o BNAI pela técnica convencional e o BNAI pela técnica de Vazirani-Akinosi quanto a quantidade de aspirações positivas e eficácia, sendo que o uso da articaína 4% com epinefrina 1:100.000 no bloqueio do nervo bucal possivelmente aumentou a eficácia anestésica de ambas as técnicas. Abstract in english INTRODUCTION: The inferior alveolar nerve block has a high percentage of failure in dentistry. To improve this ratio, has been studied different alternatives, as different techniques, as well as anesthetics. OBJECTIVE: Evaluate two different techniques (conventional technique and Vazirani-Akino [...] si) for inferior alveolar nerve block, and compare them regarding their effectiveness and quantify the percentage of positive aspirations in both techniques. MATERIAL AND METHOD: 160 patients were evaluated for both sex, with 80 undergoing Vazirani-Akinosi technique plus buccal nerve block (G1), and 80 to conventional inferior alveolar nerve block plus buccal nerve block (G2), both groups using a combination of 4% articaine with 1:100.000 epinephrine to buccal nerve block and 2% lidocaine with 1:100.000 epinephrine to inferior alveolar nerve block. We evaluated the amount of positive aspirations, the effectiveness or not of anesthesia (pain) and when it occurred during the surgical procedure. RESULT: There were no statistically significant differences (p = 0.2453) between G1 and G2 observing the positive aspiration. It was obtained efficiency of 90% for both techniques. CONCLUSION: No significant difference between the conventional alveolar inferior nerve block technique and Vazirani-Akinosi alveolar nerve block technique considering the amount of positive aspirations and efficacy, and the use of 4% articaine with 1:100.000 epinephrine in buccal nerve block possibly increased the anesthetic efficacy of both techniques.

Danilo de Paula Ribeiro, Borges; Liane Maciel de Almeida, Souza; Maria Luisa Silveira, Souto; Liliane Poconé, Dantas; Mônica Silveira, Paixão; Francisco Carlos, Groppo.

2014-01-01

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Desplazamiento accidental hacia el espacio parafaríngeo de un fragmento de un tercer molar inferior retenido / Accidental displacement of a fragment of a retained lower third molar towards the parapharyngeal space  

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Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish La extracción quirúrgica de los terceros molares retenidos es la operación realizada con más frecuencia por los cirujanos maxilofaciales, incluso de forma profiláctica, y se asocia con complicaciones trans y posoperatorias. Se presenta un caso con desplazamiento de un fragmento del tercer molar infe [...] rior izquierdo durante su exéresis quirúrgica hacia el espacio parafaríngeo, que resulta raro tanto por su frecuencia como por el tratamiento utilizado en esta complicación, pues se han reportado muy pocos casos en la literatura internacional y ninguno en nuestro país. Abstract in english The surgical removal of the retained third molars is the most common surgery performed by maxillofacial surgeons, even in a prophylactic way, and it is associated with trans- and postoperative complications. A case with displacement of a fragment of the left lower third molar towards the parapharyng [...] eal space during its surgical exeresis is presented. It is a rare case due to its frequency and to the treatment used in this complication, since a few cases have been reported in international literature and none in our country.

Yudit, Algozaín Acosta; Mileydis, Viñas García.

2008-03-01

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Uso de metilprednisolona versus diclofenaco en el control de la inflamación y el trismo tras la cirugía del tercer molar inferior / The use of methylprednisolone versus diclofenac in the treatment of inflammation and trismus after surgical removal of lower third molars  

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Full Text Available SciELO Spain | Language: Spanish Abstract in spanish Objetivo: Comparar el efecto sobre la inflamación y el trismo de la metilprednisolona (corticoide) versus diclofenaco (antiinflamatorio no esteroideo-AINE-) tras la cirugía del tercer molar inferior. Diseño del estudio: Estudio prospectivo sobre 73 pacientes sometidos a la extracción quirúrgica de l [...] os terceros molares inferiores. Fueron divididos de forma aleatoria en dos grupos: De diclofenaco y de metilprednisolona. Se cumplimentó una ficha donde se hizo constar los datos epidemiológicos y clínicos preoperatorios y postoperatorios en relación a la inflamación y el trismo (tres medidas faciales y apertura bucal). Se usó el programa estadístico BMDP para hacer un amplio tratamiento de los datos. Resultados: A las 24 horas el grupo tratado con diclofenaco presentaba mayor inflamación en una de las medidas faciales (p Abstract in english Objective: To compare the efficacy of methylprednisolone (corticoid)versus diclofenac (nonsteroidal anti-inflammatory -NSAID-) in the treatment of inflammation and trismus after the surgical removal of lower third molars. Study design: Prospective study on 73 patients for the surgical removal of the [...] ir lower third molars. These patients were separated in two groups at ramdom: the diclofenac group and the methylprednisolone group. A record card was filled in with preoperative and postoperative epidemiological and clinic data about inflammation and trismus (three facial measures and mouth opening). In order to make a broad study of data, BMDP program was used for statistics. Results: 24 hours after surgery, patients in the diclofenac group showed a more severe inflammation in one of the facial measurements (p

Carmen, López Carriches; José Mª, Martínez González; Manuel, Donado Rodríguez.

2006-09-01

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Gel de Clorhexidina intra-alveolar en la prevención de la alveolitis tras la extracción de terceros molares inferiores: Estudio piloto / Intra-alveolar chlorhexidine gel for the prevention of dry socket in mandibular third molar surgery: A pilot study  

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Full Text Available SciELO Spain | Language: Spanish Abstract in spanish Introducción: La clorhexidina es un buen agente profiláctico de la alveolitis post-extracción. La aparición del gel bioadhesivo conteniendo clorhexidina al 0,2% podría mejorar esta acción. Su colocación intraalveolar permitiría una actuación más directa sobre el alveolo y una actuación más prolongad [...] a del fármaco. Pacientes y método: Presentamos un estudio a simple ciego, randomizado, sobre 30 pacientes, valorando la influencia de la colocación en una sola vez y de forma intraalveolar gel bioadhesivo conteniendo clorhexidina al 0,2% tras la extracción de terceros molares incluidos, en la aparición de alveolitis y en el postoperatorio de los pacientes. Resultados: Encontramos una reducción del 42,65% en la tasa de alveolitis y un postoperatorio más favorable en el grupo experimental. En el grupo control, la alveolitis apareció en un 30,76% frente a un 17,64 % en el grupo experimental. Discusión y Conclusiones: Tras comparar nuestros datos con otros estudio, pensamos que el gel bioadhesivo de clorhexidina al 0,2%, aplicado en una sola vez de forma intraalveolar parece ser una opción adecuada para la prevención de la alveolitis. Esta actuación mejora la apertura bucal y el edema en el postoperatorio, aunque son necesarios nuevos estudios realizados a doble ciego y con muestras más amplias para confirmar nuestros datos. Abstract in english Purpose: Chlorhexidine is a good prophylactic agent for post-extraction dry socket alveolitis. The bio-adhesive 0.2% chlorhexidine gel could improve this action since its intra-alveolar positioning would allow a more direct action on the alveolus and more prolonged action of the medication. Material [...] s and Method: We present a single blind, randomised study on 30 patients to evaluate the efficacy of the bio-adhesive 0.2% chlorhexidine gel, placed only once within the alveolus, on the reduction of the incidence of impacted third molar post-extraction dry socket alveolitis and its post-operative effects on patients. Results. A reduction of 42.65% in the occurrence of alveolitis and a more favourable post-operative period in the experimental group was observed. In the control group, the appearance of alveolitis was 30.76% opposite to 17.64 % in the experimental group. Conclusions: The bio-adhesive 0.2% chlorhexidine gel, applied only once after the extraction of impacted third molars, seems to be an appropriate option for the reduction of alveolitis. It improves the buccal aperture and oedema in the post-operative period, although further double blind studies with larger samples are necessary.

Daniel, Torres Lagares; Pedro, Infante Cossio; Jose Luis, Gutierrez Perez; Manuel Maria, Romero Ruiz; Manuel, Garcia Calderon; Maria Angeles, Serrera Figallo.

2006-04-01

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Lower third molar fused with a supernumerary tooth: diagnosis and treatment planning using Cone-Beam Computed Tomography / Terceiro molar inferior fusionado com um supranumerário: diagnóstico e plano de tratamento usando Tomografia Computadorizada Volumétrica  

Scientific Electronic Library Online (English)

Full Text Available Fusão é a união de dois germes dentários em desenvolvimento, resultando numa única estrutura dentária, podendo ocorrer entre dois germes dentários normais ou entre o germe de um dente normal com um supranumerário. Dentes supranumerários são dentes adicionais à série normal e podem ocorrer em qualque [...] r região da arcada dentária, entretanto, são mais comumente encontrados na maxila do que na mandíbula. O presente artigo ilustra um caso de fusão entre um terceiro molar mandibular e um dente supranumerário, onde foi realizada uma intervenção cirúrgica com o objetivo de remover os elementos dentários. Para complementar o diagnóstico, além da radiografia panorâmica, utilizou-se a técnica radiográfica de Donovan, mas, devido à proximidade do elemento dental com o ramo mandibular, não foi possível determinar um diagnóstico preciso de fusão. Sendo assim foi utilizada a Tomografia Computadorizada Volumétrica que fornece informações precisas e em três dimensões, possibilitando desta forma chegar ao diagnóstico de fusão e também auxiliando no planejamento cirúrgico. Abstract in english Fusion is the union of two developing dental germs, resulting in a single large dental structure. It involve two normal dental germs or the germ of a normal tooth with a germ of a supernumerary one. Supernumerary teeth are additional teeth of the normal series which may occur in any region of the de [...] ntal arch, althoug they are more common in the maxilla than in the mandible. This article presents a case of fusion between a third molar and a supernumerary tooth, in which a surgical intervention was carried out, with the objective of removing the dental elements. The panoramic radiography was complemented by the Donovan´s radiographic technique, but because of the proximity of the dental element to the mandibular ramus, it was not possible to have a final fusion diagnosis. Hence, the Cone-Beam Computed Tomography which provides precise three-dimensional information, was used to determinate the fusion diagnosis and also to help in the surgical planning.

Osny, FERREIRA-JÚNIOR; Luciana Dorigatti de, ÁVILA; Marcelo Bonifácio da Silva, SAMPIERI; Eduardo, DIAS-RIBEIRO.

2014-12-01

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Comparison of the cleaning efficacy of the FKG race system and hand instrument in molar root canal / Comparação da eficácia de limpeza entre o sistema FKG race e instrumentos manuais em molares inferiores  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese Objetivo deste trabalho foi avaliar a capacidade de limpeza de canais radiculares por meio do sistema de instrumentação RaCe (FKG Dentaire - La-Cheaux-de Fonds - Suíça) em comparação à instrumentação manual por meio de limas tipo K-File (Maillefer Instruments - Ballaigues - Suíça). Foram selecionado [...] s 20 dentes humanos extraídos (molares superiores) que tiveram seu conteúdo radicular removido após realização da abertura coronária. Os canais foram preenchidos com corante (tinta nanquim) e após 48 horas para secagem, realizou-se a odontometria da raiz mésio-vestibular. Metade dos espécimes foi instrumentada pela técnica de Oregon modificada e a outra metade pela seqüência crown-down preconizada pelo fabricante do sistema RaCe. Após o preparo, os dentes foram seccionados longitudinalmente e avaliados de acordo com a quantidade de corante remanescente. Os dados obtidos foram registrados por meio de escores numéricos e as médias aritméticas foram analisadas entre os grupos pelo teste de Mann Whitney. Ambas as técnicas foram incapazes de limpar completamente o interior dos canais radiculares sendo que a técnica manual desempenhou limpeza significantemente superior apenas no terço médio. Conclui-se que o sistema RaCe foi capaz de desempenhar uma limpeza satisfatória sendo próxima àquela conseguida pela técnica de instrumentação manual. Abstract in english INTRODUCTION AND OBJECTIVE: The aim of this study was to evaluate the ability of root canal cleaning of the RaCe rotary instrumentation system (FKG Dentaire - La-Cheaux-de Fonds - Switzerland), compared to manual filing with Stainless Steel K-files (Maillefer Instruments - Ballaigues - Switzerland). [...] MATERIAL AND METHOD: Twenty extracted human teeth (maxillary molars) were selected and their pulp tissue was removed after coronal access. The root canals were filled with a dye (India ink) and allowed to dry for 48 hours, followed by establishment of the working length of the mesiobuccal root; then, half of the specimens were instrumented by the modified Oregon technique and the other half were instrumented by crown-down sequence of the RaCe system. After preparation, the teeth were longitudinally sectioned and evaluated according to the amount of remaining dye. RESULTS: Data obtained were registered as numerical scores, and the arithmetic means were compared between groups using the Mann Whitney test. Both techniques were unable to completely clean the interior of the root canals, with a better performance of the manual technique only at the middle third. CONCLUSION: It could be concluded that the RaCe system was able to provide satisfactory cleaning, similar to that obtained by the manual instrumentation technique.

Carla Renata, Sipert; Renata Pardini, Hussne; Celso Kenji, Nishiyama.

2006-01-01

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Location and angulation of curvatures of mesiobucal canals of mandibular molars debrided by three endodontic techniques / Posição e angulação de curvaturas radiculares em canais mesiobucais de molares inferiores preparados por três técnicas endodônticas  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese O objetivo deste trabalho foi verificar a correlação entre o grau de angulação e a posição das curvaturas radiculares, e a sua influência nos resultados comparativos entre os desempenhos das técnicas do Preparo Progressivo, Escalonada e Seriada. Os canais mésio-vestibulares de 70 dentes molares infe [...] riores extraídos foram preenchidos com um contraste radiológico de sulfato de Bário a 100% e radiografados em um sistema de radiografia digital direta, em um aparato que garantia que as amostras ficassem sempre na mesma posição espacial. As imagens foram, então, analisadas no programa Coreldraw 10 (MicroSafe, RJ, Brasil) segundo dois critérios: os métodos de Berbert, Nishiyama¹ (1994) e de Schneider11 (1971) para determinação da posição e do ângulo das curvaturas radiculares, respectivamente. Estudou-se inicialmente a possibilidade de correlação entre essas duas variáveis. Os dentes foram, então, selecionados segundo a angulação (superior a 25 graus) e posição das curvaturas radiculares (cervical, mediana e apical) para a realização das técnicas endodônticas. Após os preparos, as amostras foram novamente radiografadas e as imagens sobrepostas para a comparação das áreas pré e pós-operatórias. A diferença entre elas mostrou a porcentagem de alargamento para cada técnica. Os resultados mostraram não existir correlação entre as angulações e as posições das curvaturas radiculares, e que as diferentes posições não interferem no desempenho das técnicas. A técnica do Preparo Progressivo mostrou maiores valores de alargamento para todos os grupos, independentemente da posição da curvatura radicular. Abstract in english The aim of this study was to assess the correlation between the degree of angulation and the position of root curvatures and their influence on the comparative results between the performances of the Progressive, Staged and Serial Preparation Techniques. The mesiobucal canals of 70 extracted mandibu [...] lar molars were filled with a radiological contrast of 100% Barium sulphate and radiographed with a direct digital radiographic system, in an apparatus that guarantees that the samples remain in the same spatial position at all times. The images were then analyzed in the Coreldraw 10 program (MicroSafe, RJ, Brasil) in accordance with two criteria: the methods of Berbert, Nishiyama¹ (1994) and Schneider11 (1971) to determine the position and the angle of the root curvatures, respectively. Initially, the possibility of correlation between these two variables was studied. The teeth were then selected according to angulation (greater than 25 degrees) and position of root curvatures (cervical, median and apical) in order to perform the endodontic techniques. After preparation, the samples were radiographed again and the images were superimposed in order to compare the pre- and post-operative areas. The difference between them showed the percentage of widening for each technique. The results showed that there was no correlation between the angulations and the root curvature positions, and that the different positions did not interfere in the performance of the techniques. The Progressive Preparation technique produced the highest widening values for all the groups, irrespective of the root curvature position.

Isa Geralda Teixeira, Constante; Harry, Davidowicz; Fernando Branco, Barletta; Abilio Albuquerque Maranhão de, Moura.

2007-03-01

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Molar Uprighting  

Science.gov (United States)

... What It's Used For Preparation How It's Done Follow-Up Risks When To Call a Professional Additional Info What Is It? Molar ... is bothering your lips, cheeks, tongue or gums, call for an appointment. ... 401 N. Lindbergh Boulevard St. Louis, MO 63141-7816 Phone: 314-993-1700 Toll-Free: 800- 424-2841 ...

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Piecewise Straight Line Approximation of Curve Existing in Slightly Curved Mesiobuccal Root Canal of Mandibular First Molar: A Radiographic Investigation Aproximación a Segmentos de Línea Recta en la Curva Existente del Canal Radicular Mesiobucal Ligeramente Curvado del Primer Molar Inferior: Una Investigación Radiográfica  

OpenAIRE

The aim of this study was to radiographically investigate the curve existing in slightly curved mesiobuccal canal of mandibular first molar by applying Piecewise straight line approximation. Extracted human mandibular molars were radiographed and one hundred radiographs were selected whose mesiobuccal canal showed slight curvature (10-20°) according to Schneider's method. The curves were traced and analyzed using Piecewise straight line method. Each curve was considered as a unit consisting ...

Prabhakar, J.; Priya, M. S.; Jones Tarcius Doss, L.; Sukumaran, V. G.

2013-01-01

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Estabilidade pós-contenção das alterações da forma do arco inferior na má oclusão de Classe II de Angle tratada com e sem a extração de pré-molares Postretention lower arch form stability in Angle Class II patients treated with and without premolars extractions  

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Full Text Available OBJETIVO: o objetivo desse estudo foi comparar o comportamento da forma do arco inferior durante as fases de tratamento e pós-contenção, em pacientes portadores de má oclusão Classe II de Angle, que haviam se submetido ao tratamento ortodôntico com extrações de dois e de quatro pré-molares, portanto com e sem extrações no arco inferior. METODOLOGIA: foram selecionados 66 pacientes que apresentavam inicialmente uma má oclusão de no mínimo meia Classe II, e que foram tratados com uma das combinações de extrações propostas. Esses pacientes foram divididos em dois grupos, sendo o grupo 1 composto de 19 pacientes tratados com extração de dois pré-molares superiores, com idade média de 14,04 anos; e o grupo 2 composto de 47 pacientes com extração de quatro pré-molares, com idade média de 13,03 anos. Para verificação das diferenças entre os grupos, mediu-se os modelos referentes às fases pré-tratamento, pós-tratamento e, em média, cinco anos após o final do tratamento ativo. As alterações das dimensões do arco inferior (distância intercaninos, intermolares e comprimento de arco, entre as três fases, também foram comparadas. RESULTADOS: os resultados demonstraram que diferenças estatisticamente significantes durante o tratamento se devem à opção por extrações no grupo 2. Não houve diferença entre os dois grupos para as mudanças pós-contenção no comprimento e na largura do arco inferior. CONCLUSÕES: pode-se esperar o mesmo grau de recidiva pós-contenção da forma do arco inferior em pacientes com má oclusão de Classe II, quando o tratamento é conduzido com extrações de dois pré-molares superiores, ou quando realizado com extrações de quatro pré-molares.AIM: the purpose of this research was to compare the relapse of the postretention lower arch form in patients with Class II malocclusions, that were treated with either two or four premolar extraction therapies. METHODS: Group 1 consisted of 19 patients (9 male e 10 female treated with two premolar extraction, and group 2 consisted of 47 patients (20 male e 27 female treated with four premolar extraction. The initial mean age of the first group was 14.04 years, and the initial mean age for group two was 13.03 years. Individual variables of the mandibular arch, such as intercanine width, intermolar width and arch length, were evaluated in the pre-treatment, end of active treatment and five years posttreatment diagnostic casts of each patient. lndependent t tests were used to compare the differences of the variables between groups. RESULTS: results demonstrated that there were no statistically significant difference between the groups for posttreatment constriction of the mandibular arch (width and length. CONCLUSION: it was concluded that the treatment of Class II malocclusion with two premolar extraction provides the same stability for lower arch form as the treatment with four premolar extraction.

Mauro C. Agner Busato

2006-10-01

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Third molar evaluation with cone-beam computerized tomography  

International Nuclear Information System (INIS)

Precise 3-dimensional localization of impacted mandibular third molars relative to the inferior dental canal (IDC) is critical to clinical management and surgical outcomes. Recently introduced dental 3-D volumetric imaging systems coupled with semi-automatic modeling techniques allows 3-D visualization of the IDC and the third-molar. Six impacted third molar sites were imaged with various 3-D volumetric imaging systems (NewTom 9000, Morita Accuitomo and Hitachi Mercuray). The spatial relationship of six impacted third-molars were visualized using imaging data obtained from these units. An interactive virtual model of a proposed third molar surgical site including the third molar and the inferior dental canal was developed. (orig.)

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Cuartos molares supernumerarios: relato de caso clínico  

Scientific Electronic Library Online (English)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish Los dientes supernumerarios se diagnostican mediante exámenes radiográficos de rutina, pues generalmente son asintomáticos. Los cuartos molares representan el segundo grupo de dientes supernumerarios con más frecuencias; ocurren en posición distal a los terceros molares, especialmente en el maxilar [...] superior, y en la mayoría de casos, estos están incluidos. El objetivo de este artículo es realizar la presentación de un caso, de una mujer de 30 anos con los cuartos molares incluidos en el maxilar inferior y describir la técnica para su remoción. Abstract in english Supernumerary teeth are generally asymptomatic and are diagnosed by routine X-ray tests. The fourth molar teeth represent the second group of the most frequent supernumerary teeth, occur in distal position to the third molar teeth, specially in the superior maxilla and, in most of the cases, they ar [...] e included. The aim of this paper is to comment on the case of a 30-year-old woman with the fourth molar teeth included in the inferior maxilla and to describe the technique used for their removal.

Daniela, Nascimento Silva; Marcelo, Ferraro-Bezerra; Karis, Barbosa Guimarães; Claudia Marcela, Hernández Cancino.

2006-04-01

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Inflammatory process decrease by gallium-aluminium-arsenide (GaAlAs) low intensity laser irradiation on postoperative extraction of impacted lower third molar; Reducao de processo inflamatorio com aplicacao de laser de arseneto de galio aluminio ({lambda}=830 nm) em pos-operatorio de exodontia de terceiros molares inferiores inclusos ou semi-inclusos  

Energy Technology Data Exchange (ETDEWEB)

This study aimed the observation of inflammatory process decrease by the use of GaAlAs Low Intensity Laser ({lambda}=830 nm; 40 mW) irradiation. Five patients were selected and submitted to surgery of impacted lower third molars, both right and left sides at different occasions. On a first stage, a tooth of a random chosen side - right or left - was extracted by conventional surgery, without LILT. The inflammatory process was measured at postoperative on the first, third and seventh days. This side was then called 'control side'. After 21 days, period in which the inflammatory process of the first surgery was terminated, the other side surgery took place, this time using LILT (4 J at four spots) at postoperative, first and third days. As the previous surgery, the inflammatory process was also measured at postoperative on the first, third and seventh days. This side was called 'experimental or lased side'. The inflammatory process was evaluated by measuring its four characteristic signs: swelling, pain, color and temperature. It was clearly observed a decrease for swelling, pain and color on the lased side which presented significant inference and descriptive statistics. It can be concluded that GaAlAs Low Intensity Laser ({lambda}=830 nm) can surely be used as an additional and important anti-inflammatory source on impacted lower third molar surgeries. (author)

Atihe, Mauricio Martins

2002-07-01

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Second molar impaction associated with lip bumper therapy  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese INTRODUÇÃO: embora placas labioativas (PLAs) promovam um ganho clínico significativo no perímetro da arcada inferior em pacientes com dentição mista, ortodontistas são relutantes em usá-las devido a possibilidade de problemas eruptivos dos segundos molares. [...] OBJETIVO: o presente estudo avaliou a impacção dos segundos molares associada ao uso das PLAs e como a impacção pôde ser resolvida. MÉTODOS: radiografias cefalométricas lateral e panorâmica de 67 pacientes (34 do sexo feminino e 33 do masculino) foram avaliadas antes (T1) e após (T2) o tratamento com PLAs, que durou aproximadamente 1,8 ± 0,9 anos. Expansão rápida do palato (ERP) foi usada na maxila no início do uso da PLA. Usando as radiografias panorâmicas, a impacção dos segundos molares inferiores foi avaliada relativamente à posição dos primeiros molares mandibulares. Os movimentos horizontais e verticais dos primeiros e segundos molares inferiores foram avaliados com base em sobreposições de estruturas estáveis da arcada inferior por meio das radiografias laterais. RESULTADOS: oito (11,9%) pacientes apresentaram impacção dos segundos molares mandibulares ao final do tratamento com PLA; dois pacientes tiveram de recorrer à intervenção cirúrgica para a correção da impacção, cinco tiveram a correção da impacção usando apenas espaçadores e um apresentou autocorreção da impacção. A coroa e o ápice do primeiro molar inferior migraram 1.3mm e 2,.3mm, respectivamente, para mesial. O segundo molar não mostrou movimento horizontal significativo. CONCLUSÃO: embora o tratamento com PLA aumente o risco de impacção do segundo molar mandibular, as impacções, na maioria das vezes, podem ser facilmente corrigidas. Abstract in english INTRODUCTION: Although lip bumpers (LBs) provide significant clinical gain of mandibular arch perimeter in mixed-dentition patients, orthodontists are reluctant to use them due to the possibility of permanent second molar eruptive disturbances. [...] OBJECTIVE: The present study was conducted to assess second molar impaction associated with the use of LBs, and to investigate how they can be solved. MATERIAL AND METHODS: Lateral and panoramic radiographs of 67 patients (34 females and 33 males) were assessed prior (T1) and post-LB treatment (T2). LB therapy lasted for approximately 1.8 ± 0.9 years. Concomitant rapid palatal expansion (RPE) was performed in the maxilla at LB treatment onset. Impaction of mandibular second molars was assessed by means of panoramic radiographs in relation to the position of first mandibular molars. Horizontal and vertical movements of first and second molars were assessed cephalometrically on lateral cephalometric radiographs based on mandibular superimpositions. RESULTS: Eight (11.9%) patients had impacted second molars at the end of LB therapy. Two patients required surgical correction, whereas five required spacers and one patient was self-corrected. Mandibular first molar tip and apex migrated forward 1.3 mm and 2.3 mm, respectively. Second molar tip showed no statistically significant horizontal movement. CONCLUSION: Although LB therapy increased the risk of second molar impaction, impactions were, in most instances, easily solved.

Helder Baldi, Jacob; Shawn, LeMert; Richard G., Alexander; Peter H., Buschang.

2014-12-01

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Utilización de un bosque deciduo por bovinos a pastoreo / Utilization of a deciduous forest by grazing bovines  

Scientific Electronic Library Online (English)

Full Text Available Con el objetivo de evaluar la utilización de un bosque deciduo por bovinos a pastoreo al noreste del estado Guárico, Venezuela, en los períodos seco y lluvioso del año 2007, se realizó un ensayo bajo un diseño factorial en bloques al azar. Para ello, se utilizaron vaquillas mestizas doble propósito [...] con una presión de pastoreo de 6 kg MS/100 kg PV. Los tratamientos evaluados fueron tres modalidades de pastoreo: Pastoreo de pasto estrella (Cynodon nlemfuensis), Pastoreo de C. nlemfuensis con acceso restringido al bosque (5 h) y Pastoreo de C. nlemfuensis con libre acceso al bosque. La superficie utilizada para los tratamientos con bosque fue 2 ha. El período de ensayo fue 10 d/época. Se midió la utilización de materia seca de gramíneas, hojarasca, follaje de árboles y frutos caídos. No se encontraron diferencias significativas en la utilización del pasto entre los distintos tratamientos. No obstante, se observaron diferencias altamente significativas (P Abstract in english With the objective to evaluate the utilization of a deciduous forest by grazing bovines at northeast of Guarico state, Venezuela, in dry and rainy seasons in 2007, it was carried out an experiment with a factorial design with randomized blocks. For that, there were used mixed dual purpose heifers wi [...] th a grazing pressure of 6 kg DM/100 kg LW. The evaluated treatments were three grazing conditions: OG: Grazing of star grass (Cynodon nlemfuensis), RAF: Grazing of C. nlemfuensis with restricted access to the forest (5 h) and OAF: Grazing of C. nlemfuensis with open access to the forest. The area used for the treatments with forest was 2 ha. Dry matter utilization of grasses, litter, tree foliage, and fallen fruits were measured. No significant differences were found for grass utilization among treatments. However, significant differences (P

Tisbey, Miliani; Freddy, Espinoza; José L, Gil; Alfredo, Baldizán; Yris, Diaz.

2008-09-01

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Multiple Abnormal Unerupted Mandibular Permanent Molar Teeth: A Case Report / Molares Mandibulares Anormales No-Erupcionados Múltiples: Reporte de un Caso  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish Los molares permanentes anormales no erupcionados múltiples, además de otras anomalías del desarrollo de los dientes, desde hace tiempo han recibido atención de anatomistas y cirujanos maxilofaciales. Este artículo presenta un caso clínico de un paciente masculino de 23 años de edad, que fue admitid [...] o en el Departamento de Cirugía Maxilofacial de la Facultad de Odontología de la Escuela de Medicina Gulhane, con una historia de seis meses de dolor, en la posición de descanso y durante la masticación, así como dolor en su cuerpo mandibular derecho. Fue encontrada la impactación que resulta de la falla en la erupción y la dislocación de la anatomía normal del desarrollo en tres molares mandibulares. En el examen extraoral fue definida asimetría facial del lado derecho. El diagnóstico de molares mandibulares anormales no erupcionados múltiples fue confirmado por radiografía panorámica e imágenes de tomografía 3D. El diente invertido no erupcionado fue el tercer molar que se encontró en la base de la mandíbula en el lado derecho. En el otro lado, el primer molar se posicionó sobre la base de la mandíbula distoangularmente. El segundo molar se encontró verticalmente en medio del cuerpo mandibular izquierdo. También, el tercer molar erupcionó mesioangularmente. La longitud del arco fue evaluada por el cirujano oral. La distancia mesio-distal entre los dientes fue suficiente. Las causas de impactación de los dientes permanentes podrían haber sido influenciadas por los factores locales, tales como la retención prolongada de dientes deciduos o gérmenes dentales malposicionados, pero no fueron provocados por deficiencia de longitud del arco y dientes supernumerarios. Anomalías tales como las reportadas en el presente caso, son importantes en la cirugía maxilofacial. Abstract in english Abnormal multiply unerupted permanent molars have long received the attention of anatomists and maxillofacial surgeons besides the other developmental teeth anomalies. This paper presents a clinical case of a 23-year-old male patient who was admitted to the department of maxillofacial surgery in fac [...] ulty of dentistry in Gulhane Medical School with a six month history of pain at the rest position and during chewing and also tender on his right corpus of mandible. The impaction which resulted in eruption failure and anatomical dislocation of the normally developed three mandibular molar teeth was found. It was defined facial asymmetry on his right side in extra-oral examination. Diagnosis of multiple abnormal unerupted mandibular molar teeth was confirmed by panoramic and 3D CT images. The unerupted inverted tooth was the third molar which is positioned to basis of the mandible on the right side. In the other side, the first molar was placed on basis of mandible and located distoangulary. The second molar was located on middle of the left corpus mandible vertically. And also, the third molar was erupted mesioangulary. The arch-length was evaluated by the oral surgeon. Mesio-distal distance between the teeth was to be sufficient. Causes of impacted permanent teeth might have been influenced by local factors such as prolonged deciduous tooth retention, malposed tooth germs, but not causing arch-length deficiency and supernumerary teeth. Abnormalities such as those reported in the present case are significant during maxillofacial surgery.

Umit, Karacayli; Nuket, Gocmen-Mas.

2009-03-01

41

Multiple Abnormal Unerupted Mandibular Permanent Molar Teeth: A Case Report Molares Mandibulares Anormales No-Erupcionados Múltiples: Reporte de un Caso  

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Full Text Available Abnormal multiply unerupted permanent molars have long received the attention of anatomists and maxillofacial surgeons besides the other developmental teeth anomalies. This paper presents a clinical case of a 23-year-old male patient who was admitted to the department of maxillofacial surgery in faculty of dentistry in Gulhane Medical School with a six month history of pain at the rest position and during chewing and also tender on his right corpus of mandible. The impaction which resulted in eruption failure and anatomical dislocation of the normally developed three mandibular molar teeth was found. It was defined facial asymmetry on his right side in extra-oral examination. Diagnosis of multiple abnormal unerupted mandibular molar teeth was confirmed by panoramic and 3D CT images. The unerupted inverted tooth was the third molar which is positioned to basis of the mandible on the right side. In the other side, the first molar was placed on basis of mandible and located distoangulary. The second molar was located on middle of the left corpus mandible vertically. And also, the third molar was erupted mesioangulary. The arch-length was evaluated by the oral surgeon. Mesio-distal distance between the teeth was to be sufficient. Causes of impacted permanent teeth might have been influenced by local factors such as prolonged deciduous tooth retention, malposed tooth germs, but not causing arch-length deficiency and supernumerary teeth. Abnormalities such as those reported in the present case are significant during maxillofacial surgery.Los molares permanentes anormales no erupcionados múltiples, además de otras anomalías del desarrollo de los dientes, desde hace tiempo han recibido atención de anatomistas y cirujanos maxilofaciales. Este artículo presenta un caso clínico de un paciente masculino de 23 años de edad, que fue admitido en el Departamento de Cirugía Maxilofacial de la Facultad de Odontología de la Escuela de Medicina Gulhane, con una historia de seis meses de dolor, en la posición de descanso y durante la masticación, así como dolor en su cuerpo mandibular derecho. Fue encontrada la impactación que resulta de la falla en la erupción y la dislocación de la anatomía normal del desarrollo en tres molares mandibulares. En el examen extraoral fue definida asimetría facial del lado derecho. El diagnóstico de molares mandibulares anormales no erupcionados múltiples fue confirmado por radiografía panorámica e imágenes de tomografía 3D. El diente invertido no erupcionado fue el tercer molar que se encontró en la base de la mandíbula en el lado derecho. En el otro lado, el primer molar se posicionó sobre la base de la mandíbula distoangularmente. El segundo molar se encontró verticalmente en medio del cuerpo mandibular izquierdo. También, el tercer molar erupcionó mesioangularmente. La longitud del arco fue evaluada por el cirujano oral. La distancia mesio-distal entre los dientes fue suficiente. Las causas de impactación de los dientes permanentes podrían haber sido influenciadas por los factores locales, tales como la retención prolongada de dientes deciduos o gérmenes dentales malposicionados, pero no fueron provocados por deficiencia de longitud del arco y dientes supernumerarios. Anomalías tales como las reportadas en el presente caso, son importantes en la cirugía maxilofacial.

Umit Karacayli

2009-03-01

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Identificación botánica y producción de frutos en un bosque deciduo del asentamiento Las Peñitas, al sur del estado Aragua, Venezuela  

Scientific Electronic Library Online (English)

Full Text Available SciELO Venezuela | Language: Spanish Abstract in spanish Se colectaron muestras vegetales con el objeto de identificar botánicamente las especies leñosas presentes en un bosque deciduo, así como su frecuencia, densidad y el grado de diversidad dentro del bosque. El bosque en estudio se dividió en cuatro áreas diferentes: bosque no intervenido, bosque no i [...] ntervenido recientemente, bosque parcialmente intervenido recientemente y bosque totalmente intervenido recientemente y en cada una se establecieron 3 transectas de 100 m x 5 m. La frecuencia y densidad se determinaron por el número de individuos de cada especie presentes en cada transecta y el grado de diversidad se estimó mediante los índices de Simpson y de Shannon. Se encontraron 32 especies botánicas diferentes, predominando la familia Leguminoseae con un 37% de participación y otras 14 familias que representaron el otro 63%. Se evidenciaron diferencias en la cantidad y la frecuencia de las especies entre cada una de las áreas fisonómicas, así como diferencias entre especies en la misma área. El área con mayor densidad de especies fue el bosque no intervenido (2.780 plantas/ha). El grado de diversidad evaluado por los índices de Simpson y de Shannon resultó mayor (P Abstract in english Herbarium specimen were collected in order to identify the woody species present in a deciduous forest, as well as their frequency, density and the degree of diversity of the forest. The studied forest was divided in four different areas: no intervened forest, forest no recently intervened, forest p [...] artially intervened recently, and forest completely intervened recently, and in each area 3 experimental plots of 100 m x 5 m were set along topography gradients. The frequency and density were determined by the number of individuals of each species in the plot, and the degree of diversity was assumed by the Simpson and Shannon’s indexes. There were 32 different botanical species, predominating the Leguminoseae family with 37% and 14 other families that represented 63%. Differences were found in the quantity and frequency of the species among the physiognomic areas, as well as differences among species in the same area. The area with higher species density was the no intervened forest (2780 plants/ha). The degree of diversity evaluated by the Simpson and Shannon´s indexes was higher (P

José, Valero; Miguel, Benezra; Selina, Camacaro; Luís, Chong; Orlando, Guenni.

2005-04-01

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Endodontic treatment of molars  

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Full Text Available Objective: Commissioned by the German Institute of Medical Documentation and Information (DIMDI the Austrian Health Institute (ÖBIG prepared a HTA report on the long-term effectiveness of endodontic treatment (root canal treatment, RCT of molars. The focus is to examine factors influencing the outcome of endodontic treatment and showing their impact on long-term results. Additionally, economic aspects of root canal treatment in Germany are discussed. Methodology: By performing a systematic literature search in 29 databases (e.g. MEDLINE, the Cochrane Library and by hand searching two peer-reviewed endodontic journals the authors could identify 750 relevant articles, of which finally 18 qualified for assessment. Results: The findings show that the most relevant factor influencing the long-term outcome of endodontic treatment is the preoperative status of a tooth. The lowest success rates are reported for molars with a preoperative devital or necrotic pulp and persisting periapical lesions (so called periapical disease. Discussion: Even if there is no positive selection of patients and the RCT is performed by a normal dentist rather than an endodontist - a fact which is very common - long-term success rates of more then 90% are possible. The overall success rates for endodontic treatment of molars therefore seem to be similar to those of other tooth-types. Conclusions: Especially primary, conventional (i.e. non-surgical root canal treatment is an effective and efficient therapy for endodontically ill molars, especially if no large periapical lesion persists. Nonetheless, a long term successful endodontic therapy requires a thorough assessment of the pre-operative status of the molar and treatment according to established guidelines.

Stürzlinger, Heidi

2006-02-01

44

Endodontic treatment of molars  

Science.gov (United States)

Objective Commissioned by the German Institute of Medical Documentation and Information (DIMDI) the Austrian Health Institute (ÖBIG) prepared a HTA report on the long-term effectiveness of endodontic treatment (root canal treatment, RCT) of molars. The focus is to examine factors influencing the outcome of endodontic treatment and showing their impact on long-term results. Additionally, economic aspects of root canal treatment in Germany are discussed. Methodology By performing a systematic literature search in 29 databases (e.g. MEDLINE), the Cochrane Library and by hand searching two peer-reviewed endodontic journals the authors could identify 750 relevant articles, of which finally 18 qualified for assessment. Results The findings show that the most relevant factor influencing the long-term outcome of endodontic treatment is the preoperative status of a tooth. The lowest success rates are reported for molars with a preoperative devital or necrotic pulp and persisting periapical lesions (so called periapical disease). Discussion Even if there is no positive selection of patients and the RCT is performed by a normal dentist rather than an endodontist - a fact which is very common - long-term success rates of more then 90% are possible. The overall success rates for endodontic treatment of molars therefore seem to be similar to those of other tooth-types. Conclusions Especially primary, conventional (i.e. non-surgical) root canal treatment is an effective and efficient therapy for endodontically ill molars, especially if no large periapical lesion persists. Nonetheless, a long term successful endodontic therapy requires a thorough assessment of the pre-operative status of the molar and treatment according to established guidelines. PMID:21289954

Habl, Claudia; Bodenwinkler, Andrea; Stürzlinger, Heidi

2006-01-01

45

Endodontic treatment of molars  

OpenAIRE

Objective Commissioned by the German Institute of Medical Documentation and Information (DIMDI) the Austrian Health Institute (ÖBIG) prepared a HTA report on the long-term effectiveness of endodontic treatment (root canal treatment, RCT) of molars. The focus is to examine factors influencing the outcome of endodontic treatment and showing their impact on long-term results. Additionally, economic aspects of root canal treatment in Germany are discussed. Methodology By performing a systematic ...

Habl, C.; Bodenwinkler, A.; Stu?rzlinger, H.

2006-01-01

46

Maxillary sinus pneumatization after maxillary molar extraction assessed with cone beam computed tomography  

International Nuclear Information System (INIS)

The purpose of this study was to examine the inferior expansion of the maxillary sinus floor following maxillary molar extraction. Cone beam computed tomographic images of 59 subjects were used to evaluate the height difference of the maxillary sinus floor between extraction sites and contralateral dentate sites. The height of the maxillary sinus floor was defined as the vertical distance to the Frankfort plane from the level of the anterior nasal spine to the most inferior point of the sinus floor. We examined the difference in sinus pneumatization according to the number of missing teeth and the vertical relationship of the molar roots to the sinus floor. The inferior expansion of the maxillary sinus floor was 1.20 ± 1.86 mm on the maxillary first molar and 1.90 ± 2.42 mm on the maxillary second molar. Increased expansion was observed in cases where two proximate molars were extracted. There was no significant difference in sinus pneumatization following extraction according to the vertical relationship of the molar roots to the sinus floor. The results of this study confirm that sinus pneumatization occurs following maxillary molar extraction. In situations where pneumatization can affect treatment after molar extraction, three-dimensional radiography should be considered.

47

Maxillary sinus pneumatization after maxillary molar extraction assessed with cone beam computed tomography  

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The purpose of this study was to examine the inferior expansion of the maxillary sinus floor following maxillary molar extraction. Cone beam computed tomographic images of 59 subjects were used to evaluate the height difference of the maxillary sinus floor between extraction sites and contralateral dentate sites. The height of the maxillary sinus floor was defined as the vertical distance to the Frankfort plane from the level of the anterior nasal spine to the most inferior point of the sinus floor. We examined the difference in sinus pneumatization according to the number of missing teeth and the vertical relationship of the molar roots to the sinus floor. The inferior expansion of the maxillary sinus floor was 1.20 {+-} 1.86 mm on the maxillary first molar and 1.90 {+-} 2.42 mm on the maxillary second molar. Increased expansion was observed in cases where two proximate molars were extracted. There was no significant difference in sinus pneumatization following extraction according to the vertical relationship of the molar roots to the sinus floor. The results of this study confirm that sinus pneumatization occurs following maxillary molar extraction. In situations where pneumatization can affect treatment after molar extraction, three-dimensional radiography should be considered.

Jung, Yu Hoa; Nah, Kyung Soo; Cho, Bong Hae [Department of Oral and Maxillofacial Radiology, College of Dentistry, Pusan National University, Pusan (Korea, Republic of)

2009-09-15

48

Presentación de un paciente geriátrico con retención de tercer molar mandibular / Presentation of a Geriatric Patient with Third Molar Retention  

Scientific Electronic Library Online (English)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish Se presentó un paciente masculino de 80 años de edad con retención del tercer molar inferior, que acudió a cuerpo de guardia con cuadro inflamatorio subagudo y dolor de moderada intensidad. El examen radiográfico evidenció la presencia del tercer molar inferior retenido en posición horizontal, el cu [...] al presentaba en su corona área radiolúcida compatible con caries dental. El paciente fue tratado con antibiótico, analgésico y antiinflamatorio y una vez rebasada la fase aguda fue intervenido quirúrgicamente con excelente evolución Abstract in english A 80-year-old male patient with retention of third lower molar that was admitted at Emergency Service with inflammatory sub-acute status and pain of moderated intensity is presented. The radiographic exam evidenced the presence of the third molar retained at horizontal position, which presented in i [...] ts crown, a dark area compatible with dental cavity. The patient was treated with antibiotic, analgesic and anti-inflammatory and when acute phase was over, the third molar was extracted. The surgery was completed without complications with an excellent evolution

David, Vazquez Isla; Miguel Osvaldo, Rodríguez Garrido; Adis Mirta, Reyna Leyva; Mirleydi, Mesa Pupo; Iveth, Méndez Danta.

2013-06-01

49

Evaluación del distalador molar Belussi Evaluation of Belussi's molar distalizer  

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Full Text Available La distalización de los molares superiores en mesogresión es una alternativa de tratamiento muy utilizado en nuestros días. Se conocen muchos métodos de distalización molar, estos han evolucionado notablemente y siguen siendo eficaces en el tratamiento. El objetivo de esta investigación fue evaluar los cambios dentales producidos por el distalador molar Belussi. El aparato fue empleado en 11 pacientes con una edad promedio de 12 años, distoclusión de molares causada por mesogresión, y con tipo facial favorable. A cada uno se le confeccionaron modelos de estudio y se le realizaron fotografías, radiografías panorámicas y telerradiografías laterales de cráneo, antes y después del tratamiento, para analizar las variables objeto de estudio. El aparato se mantuvo en boca hasta lograr un sobretratamiento de la relación molar. Finalmente, se obtuvo una distalización molar de 4,45 mm acompañada de una inclinación de 5,55°, con una pérdida mínima de anclaje temporal.The distalization of the superior molars in mesial migration is a useful alternative treatment nowadays. Many methods of molar distalization are known. They have significantly evolved and they are still effective in the treatment. The objective of this investigation was to evaluate the dental changes produced by Belussi Molar Distalizer. The appliance was used in 11 patients with an average of 12 years-old, distoocclusion of molars caused by mesial migration and with a favorable facial type. Study models were made for each one of them and pictures, panoramic x-rays and lateral X-rays of the skull were taken, before and after the treatment, to analyze the variables object of study. The appliance was kept in the mouth until achieving an overtreatment of the molar relation. Finally, a molar distalization of 4.45 mm accompanied with an inclination of 5.55° was obtained, with a minimum loss of temporary anchorage.

Samer Abdel Nour Khoury

2008-12-01

50

Efficacy of the technique of piezoelectric corticotomy for orthodontic traction of impacted mandibular third molars.  

Science.gov (United States)

Our aim was to assess the efficacy of piezoelectric corticotomy for orthodontic traction of mandibular third molars close to the inferior alveolar nerve. Thirty patients with impacted third molars close to the nerve were included in the study, 15 of whom were treated with conventional orthodontic traction and 15 with piezoelectric corticotomy. We recorded duration of treatment including exposure and orthodontic traction, and time to the final extraction. Postoperative complications including trismus, swelling, and pain were also noted. Alveolar bone levels mesial and distal to the second molars were evaluated on cone-beam computed tomographic (CT) images. Student's t test was used to assess the significance of differences between the groups. After orthodontic treatments all impacted third molars were successfully removed from the inferior alveolar nerve without neurological damage. The mean (SD) duration of surgical exposure in the piezoelectric corticotomy group was significantly longer than that in the conventional group (p=0.01). The mean (SD) duration of traction was 4 (2.3) months after piezoelectric corticotomy, much shorter than the 7.5 (1.3) months in the conventional group (p=0.03). There were no significant differences in postoperative complications between the groups. There was a significant increase in the distal alveolar height of second molars after treatment in both groups (ppiezoelectric corticotomy allows more efficient and faster traction of third molars with a close relation between the root and the inferior alveolar nerve, although it took longer than the traditional technique. PMID:25638568

Ma, Zhigui; Xu, Guangzhou; Yang, Chi; Xie, Qianyang; Shen, Yuqing; Zhang, Shanyong

2015-04-01

51

Embarazo molar repetido: Caso clínico  

Scientific Electronic Library Online (English)

Full Text Available SciELO Venezuela | Language: Spanish Abstract in spanish Se presenta el caso clínico de una paciente con tres embarazos molares en tres años. Los dos primeros fueron dos molas completas y el último una mola parcial, todas de la misma pareja sexual. Se revisaron 385 historias de pacientes con cualquier tipo de embarazo molar entre 1991-2000. Hubo 3 pacient [...] es con embarazo molar repetido lo que representa el 0,77 %, se diagnosticaron 104 embarazos y de estos 4 fueron molares lo que representó una mola por cada 26 embarazos. Se hacen comentarios sobre etiología, futuro reproductivo, posible evolución hacia tumor trofoblástico de la gestación y vigilancia clínica de los próximos embarazos. Abstract in english The case of a patient with three molar pregnancies in three years is reported. The first two were complete mola and the last one a partial mola, all from the same sexual partner. The record of 385 patients with any kind of molar pregnancy between 1991-2000 were revised and there were 3 patients with [...] repeated molar pregnancies (0.77 %). There were 104 pregnancies from which 4 were mola (one mola for each 26 pregnancies). We comment about etiology, reproductive future, possible evolution to gestational trophoblastic tumor and clinical surveillance of subsequent pregnancies.

Leonor, Zapata; Sol Felice, Rebolledo; Rosa, Urbano; José, Vidal; Ivelise, López.

2002-03-01

52

Embarazo molar repetido: Caso clínico  

Directory of Open Access Journals (Sweden)

Full Text Available Se presenta el caso clínico de una paciente con tres embarazos molares en tres años. Los dos primeros fueron dos molas completas y el último una mola parcial, todas de la misma pareja sexual. Se revisaron 385 historias de pacientes con cualquier tipo de embarazo molar entre 1991-2000. Hubo 3 pacientes con embarazo molar repetido lo que representa el 0,77 %, se diagnosticaron 104 embarazos y de estos 4 fueron molares lo que representó una mola por cada 26 embarazos. Se hacen comentarios sobre etiología, futuro reproductivo, posible evolución hacia tumor trofoblástico de la gestación y vigilancia clínica de los próximos embarazos.The case of a patient with three molar pregnancies in three years is reported. The first two were complete mola and the last one a partial mola, all from the same sexual partner. The record of 385 patients with any kind of molar pregnancy between 1991-2000 were revised and there were 3 patients with repeated molar pregnancies (0.77 %. There were 104 pregnancies from which 4 were mola (one mola for each 26 pregnancies. We comment about etiology, reproductive future, possible evolution to gestational trophoblastic tumor and clinical surveillance of subsequent pregnancies.

Leonor Zapata

2002-03-01

53

Inferior vestibular neuritis.  

Science.gov (United States)

Vestibular neuritis (VN) mostly involves the superior portion of the vestibular nerve and labyrinth. This study aimed to describe the clinical features of VN involving the inferior vestibular labyrinth and its afferents only. Of the 703 patients with a diagnosis of VN or labyrinthitis at Seoul National University Bundang Hospital from 2004 to 2010, we retrospectively recruited 9 patients (6 women, age range 15-75) with a diagnosis of isolated inferior VN. Diagnosis of isolated inferior VN was based on torsional downbeating spontaneous nystagmus, abnormal head-impulse test (HIT) for the posterior semicircular canal (PC), and abnormal cervical vestibular-evoked myogenic potentials (VEMP) in the presence of normally functioning horizontal and anterior semicircular canals, as determined by normal HIT and bithermal caloric tests. All patients presented with acute vertigo with nausea, vomiting, and imbalance. Three patients also had tinnitus and hearing loss in the involved side. The rotation axis of torsional downbeating spontaneous nystagmus was best aligned with that of the involved PC. HIT was also positive only for the involved PC. Cervical VEMP was abnormal in seven patients, and ocular VEMP was normal in all four patients tested. Ocular torsion and subjective visual vertical tests were mostly within the normal range. Since isolated inferior VN lacks the typical findings of much more prevalent superior VN, it may be mistaken for a central vestibular disorder. Recognition of this rare disorder may help avoid unnecessary workups in patients with acute vestibulopathy. PMID:22215238

Kim, Ji-Soo; Kim, Hyo Jung

2012-08-01

54

Mini-implants: mechanical resource for molars uprighting  

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Full Text Available INTRODUCTION: The early orthodontic treatment allows correction of skeletal discrepancies by growth control, and the elimination of deleterious habits, which are risk factors for the development of malocclusions, favoring for the correction of tooth positioning later in a second treatment stage. During development of teeth and occlusion, the mandibular second molars commonly erupt in the oral cavity after all other teeth of the anterior region. In their eruptive process there may be a condition known as tooth impaction, which precludes its complete eruption and requires proper uprighting treatment. The temporary anchorage devices allow disimpaction and movement of these teeth directly to their final position, without the need of patient compliance or reaction movements in other parts of the arch. OBJECTIVE: This paper aims at describing a case report of the treatment of a patient with Angle Class II malocclusion, performed in two phases, in which mini-implants were used for uprighting the impacted mandibular second molars.INTRODUÇÃO: o tratamento ortodôntico precoce permite a correção das discrepâncias esqueléticas por meio do controle de crescimento e a eliminação de hábitos deletérios, que são fatores de risco para o desenvolvimento de más oclusões, que favorecem a correção do posicionamento dentário mais tardiamente, em uma segunda fase do tratamento. Durante o desenvolvimento da dentição e da oclusão, normalmente o segundo molar inferior chega à cavidade bucal após todos os dentes posicionados anteriormente a ele. Durante seu processo eruptivo, pode ocorrer uma condição chamada "impacção dentária", em que sua erupção completa é interrompida, exigindo tratamento apropriado para verticalização. Os dispositivos temporários de ancoragem permitem a desimpacção e a movimentação desses dentes diretamente às suas posições finais, sem a necessidade de cooperação do paciente e sem movimento de reação nas outras unidades da arcada. OBJETIVO: descrever o tratamento de um caso de má oclusão Classe II de Angle, realizado em duas fases, durante o qual foram utilizados mini-implantes para verticalização dos segundos molares inferiores impactados.

Susiane Allgayer

2013-02-01

55

An evaluation of lidocaine hydrocarbonate compared with lidocaine hydrochloride for inferior alveolar nerve block.  

OpenAIRE

The purpose of this study was to measure the degree of anesthesia obtained with 2.2% lidocaine hydrocarbonate, 2.2% lidocaine hydrocarbonate with 1:100,000 epinephrine, and 2% lidocaine hydrochloride with 1:100,000 epinephrine for inferior alveolar nerve block. Using a repeated-measures design, 30 subjects randomly received an inferior alveolar injection of each solution over the course of three successive appointments. The first molar, first premolar, lateral incisor, and contralateral canin...

Chaney, M. A.; Kerby, R.; Reader, A.; Beck, F. M.; Meyers, W. J.; Weaver, J.

1991-01-01

56

Isolated inferior mesenteric portal hypertension with giant inferior mesenteric vein and anomalous inferior mesenteric vein insertion  

OpenAIRE

Extrahepatic portal hypertension is not an uncommon disease in childhood, but isolated inferior mesenteric portal varices and lower gastrointestinal (GI) bleed have not been reported till date. A 4-year-old girl presented with lower GI bleed. Surgical exploration revealed extrahepatic portal vein obstruction with giant inferior mesenteric vein and colonic varices. Inferior mesenteric vein was joining the superior mesenteric vein. The child was treated successfully with inferior mesenteric –...

Prasad, G. Raghavendra; Billa, Srikar; Bhandari, Pavaneel; Hussain, Aijaz

2013-01-01

57

Isolated inferior mesenteric portal hypertension with giant inferior mesenteric vein and anomalous inferior mesenteric vein insertion.  

Science.gov (United States)

Extrahepatic portal hypertension is not an uncommon disease in childhood, but isolated inferior mesenteric portal varices and lower gastrointestinal (GI) bleed have not been reported till date. A 4-year-old girl presented with lower GI bleed. Surgical exploration revealed extrahepatic portal vein obstruction with giant inferior mesenteric vein and colonic varices. Inferior mesenteric vein was joining the superior mesenteric vein. The child was treated successfully with inferior mesenteric - inferior vena caval anastomosis. The child was relieved of GI bleed during the follow-up. PMID:23798814

Prasad, G Raghavendra; Billa, Srikar; Bhandari, Pavaneel; Hussain, Aijaz

2013-04-01

58

Anesthetic technique for inferior alveolar nerve block: a new approach  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english BACKGROUND: Effective pain control in Dentistry may be achieved by local anesthetic techniques. The success of the anesthetic technique in mandibular structures depends on the proximity of the needle tip to the mandibular foramen at the moment of anesthetic injection into the pterygomandibular regio [...] n. Two techniques are available to reach the inferior alveolar nerve where it enters the mandibular canal, namely indirect and direct; these techniques differ in the number of movements required. Data demonstrate that the indirect technique is considered ineffective in 15% of cases and the direct technique in 13-29% of cases. OBJECTIVE: The aim of this study was to describe an alternative technique for inferior alveolar nerve block using several anatomical points for reference, simplifying the procedure and enabling greater success and a more rapid learning curve. MATERIAL AND METHODS: A total of 193 mandibles (146 with permanent dentition and 47 with primary dentition) from dry skulls were used to establish a relationship between the teeth and the mandibular foramen. By using two wires, the first passing through the mesiobuccal groove and middle point of the mesial slope of the distolingual cusp of the primary second molar or permanent first molar (right side), and the second following the oclusal plane (left side), a line can be achieved whose projection coincides with the left mandibular foramen. RESULTS: The obtained data showed correlation in 82.88% of cases using the permanent first molar, and in 93.62% of cases using the primary second molar. CONCLUSION: This method is potentially effective for inferior alveolar nerve block, especially in Pediatric Dentistry.

Dafna Geller, Palti; Cristiane Machado de, Almeida; Antonio de Castro, Rodrigues; Jesus Carlos, Andreo; José Eduardo Oliveira, Lima.

2011-02-01

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Assessment of first molars sagittal and rotational position in Class II, division 1 malocclusion  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese OBJETIVO: esse estudo avaliou o posicionamento anteroposterior dos primeiros molares superiores (1º MS) e inferiores, e o grau de rotação dos 1º MS, em indivíduos com má oclusão de Classe II, divisão 1. MÉTODOS: mensuraram-se, em aparelho de precisão Assimetria I, 60 pares de modelos, de 27 indivídu [...] os do sexo feminino e 33 do masculino, entre 12 e 21 anos de idade, com má oclusão de Classe II, divisão 1. Utilizando a sutura palatina mediana como referência de eixo de simetria, os modelos foram posicionados no aparelho para mensuração da distância entre a crista marginal mesial do molar mais distal e a crista marginal mesial do molar do lado oposto, a fim de verificar o posicionamento sagital dos molares. Em relação à giroversão, mediu-se a distância entre pontos na crista marginal mesial. O teste qui-quadrado a 5% foi utilizado para verificar a variação de posicionamento dos molares, por arcos e por lado. O teste t de Student a 5% foi utilizado para comparar esses valores. RESULTADOS: houve maior número de molares inferiores mesializados e, comparando os lados, maior número de molares mesializados no lado direito em ambas as arcadas. As rotações médias dos molares foram de 0,76mm do lado direito e 0,93mm do esquerdo. CONCLUSÃO: não houve diferença estatisticamente significativa entre os valores médios das mesializações dos molares quanto a lado ou arco. Quando observada isoladamente, a rotação dos molares, quantificada em milímetros, representou uma situação de ¼ de Classe II. Abstract in english OBJECTIVE: This study assessed the anterior-posterior positioning of the upper and lower first molars, and the degree of rotation of the upper first molars in individuals with Class II, division 1, malocclusion. METHODS: Asymmetry I, an accurate device, was used to assess sixty sets of dental casts [...] from 27 females and 33 males, aged between 12 and 21 years old, with bilateral Class II, division 1. The sagittal position of the molars was determined by positioning the casts onto the device, considering the midpalatal suture as a symmetry reference, and then measuring the distance between the mesial marginal ridge of the most distal molar and the mesial marginal ridge of its counterpart. With regard to the degree of rotation of the upper molar, the distance between landmarks on the mesial marginal ridge was measured. Chi-square test with a 5% significance level was used to verify the variation in molars position. Student's t test at 5% significance was used for statistical analysis. RESULTS: A great number of lower molars mesially positioned was registered, and the comparison between the right and left sides also demonstrated a higher number of mesially positioned molars on the right side of both arches. The average rotation of the molars was found to be 0.76 mm and 0.93 mm for the right and left sides, respectively. CONCLUSION: No statistically significant difference was detected between the mean values of molars mesialization regardless of the side and arch. Molars rotation, measured in millimeters, represented ¼ of Class II.

Paulo Estevão, Scanavini; Renata Pilli, Jóias; Maria Helena Ferreira, Vasconcelos; Marco Antonio, Scanavini; Luiz Renato, Paranhos.

2013-12-01

60

Primary inferior oblique overaction-management by inferior oblique recession.  

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Full Text Available PURPOSE: To evaluate the effect of 10 mm inferior oblique recession in horizontal strabismus with V pattern and primary inferior oblique overaction. METHODS: Ten patients of V esotropia and exotropia with primary inferior oblique overaction underwent 10 mm inferior oblique recession by the methods described by Park and Stallard. Pre- and postoperative V pattern, inferior oblique overaction and binocularity were assessed. Patients were followed up for 3 months. RESULTS: The mean preoperative V pattern was 38.3 PD and the mean inferior oblique overaction was 22 PD. After surgery the mean correction of the V pattern was 26.9 PD and the mean residual V pattern was 11.4 PD. None of the patients had inferior oblique overaction postoperatively. 70% of the patients showed improvement in binocularity. CONCLUSION: 10 mm Inferior oblique recession by the described technique is a simple, safe and effective method for the cosmetic and functional treatment of horizontal deviation and V pattern with primary inferior oblique overaction.

Kamlesh

2002-01-01

61

Autotransplantation of a Mandibular Third Molar: A Case Report with 5 Years of Follow-up  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese O objetivo deste trabalho foi descrever o transplante autógeno de um terceiro molar inferior direito para substituir as raízes residuais do segundo molar no mesmo quadrante, preservando a função e a estética. Foi realizado acompanhamento clínico e radiográfico por 5 anos. Após o transplante, o dente [...] doador recebeu tratamento endodôntico e colocação de hidróxido de cálcio, o qual foi substituído periodicamente a cada 3 meses, até a obturação dos canais radiculares, totalizando período de 1 ano quando então, o fechamento apical foi confirmado. O dente encontra-se em perfeitas condições funcionais e estéticas após 5 anos do início do tratamento. O autotransplante é uma opção viável para a substituição de dentes perdidos quando um dente doador está disponível. O autotransplante de um terceiro molar inferior direito com comprometimento estético e funcional afim de substituir raízes residuais (resultado de um processo cariogênio extenso) de um segundo molar do mesmo quadrante foi um tratamento alternativo viável. Abstract in english This paper describes the autologous transplantation of a mandibular right third molar to replace the residual roots of the second molar in the same quadrant, preserving function and aesthetics. A 5-year clinical and radiographic follow-up was undertaken. After transplantation, the donor tooth receiv [...] ed endodontic treatment and placement of calcium hydroxide, which was periodically replaced every 3 months until the filling of the root canals, totalizing a period of 1-year, when apical closure was confirmed. The tooth was in perfect functional and aesthetic conditions 5 years after beginning of treatment. Autotransplantation is a feasible option for replacing missing teeth when a donor tooth is available. The autotransplantation of a right mandibular third molar with compromised function and aesthetics to replace the residual roots resulting from coronal destruction due to extensive carious lesion of the second molar in the same quadrant was a viable treatment alternative.

Mauro Henrique Chagas e, Silva; Mariane Floriano Lopes Santos, Lacerda; Maria das Gracas Afonso Miranda, Chaves; Celso Neiva, Campos.

2013-06-01

62

Molar development in sheep: morphology, radiography, microhardness  

International Nuclear Information System (INIS)

The chronology of molar development is studied from radiographic and macroscopic observations on 48 south Pre-Alps were living under optimal nutritional conditions. It was found that the first molar started its development in utero, the second molar at one month after birth, and the third molar, at 9-10 months. The first molar emerged into the oral cavity at 3 months, the second at 9 months and the third molar at 18 months. The first molar began the development of its roots at 6-7 months, the second molar at 11-12 months and the third molar at 20-22 months. The first molar reached completion of the growth of its roots at 3.5-4 years, the second and the third molars at about 6 years. The molars show the particularity of being functional during the three months which follow their eruption although the development of the crown is not completed. Then the accelerated wear is only partially compensated by the growth of the roots. The study also shows how the combined effects of wear and dentine deposit in the pulp cavity affect the morphology of molars. It reveals the marked hardness of enamel (240 Vickers units) and the low resistance of dentine at the surface of attrition (30 Vickers units)

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Anaesthetic Challenges in Molar Pregnancy  

OpenAIRE

Gestational Trophoblastic Disease (GTD) is a spectrum of tumours with a wide range of biologic behaviour and potential for metastases, which were often fatal in the past. However, with better understanding of patho-physiology in the last few years, most women can now be cured. A Hydatidiform Mole (or Molar Pregnancy) is a benign Gestational Trophoblastic Disease that originates from the placenta. Treatment consists of vacuum evacuation but rarely hysterectomy may be required. Anaesthetic mana...

Ghansham Biyani; Sadik Mohammed; Pradeep Bhatia

2013-01-01

64

/ Inferior alveolar nerve paresthesia caused by a dentigerous cyst associated with three teeth  

Scientific Electronic Library Online (English)

Full Text Available The dentigerous cyst is a common pathologic entity associated with an impacted tooth, usually third molars. They generally are asymptomatic, being found on routine dental radiographic examination. This report describes the case of a 43 year old male with a large dentigerous cyst associated with mand [...] ibular canine, first and second premolar teeth that caused paresthesia of the inferior alveolar nerve.

Mahmut, Sumer; Burcu, Bas; Levent, Yildiz.

2007-09-01

65

Autotransplantation of a Mature Mandibular Third Molar to Replace Hopeless Mandibular First Molar Autotransplantation of a Mature Mandibular Third Molar to Replace Hopeless Mandibular First Molar  

OpenAIRE

In this case report, a mature third mandibular molar was transplanted in the socket of a hopeless first mandibular molar of the same quadrant. A 32-year-old woman was diagnosed with strip perforation of her left first lower molar. Orthograde and retrograde treatments were unsuccessful. The tooth was extracted and replaced by the third molar of the same quadrant. Following transplantation, the tooth was splinted and the soft tissue was sutured. Removing sutures and pulp extirpation were carr...

Samar Fatemi; Sonbol Fatemi; Maryam Boojarpoor

2013-01-01

66

Inferior alveolar nerve damage because of overextended endodontic material: a problem of sealer cement biocompatibility?  

Science.gov (United States)

Damage to the inferior alveolar nerve is a relatively infrequent complication in dental practice. When root canal treatment of a lower molar or premolar surpasses and/or overextends beyond the apical foramen and invades the periapical zone, the foreign material introduced within such a sensitive anatomical space may mechanically or even chemically affect the inferior alveolar nerve. We describe a case of endodontic treatment of a permanent right lower first molar in which the sealer cement overextended in large amounts and damaged the right inferior alveolar nerve. The condition reverted a few months after the surgical removal of the material. Evaluation of the removed material, using powder x-ray diffraction and scanning electron microscopy with coupled dispersive energy spectroscopy, showed it to consist of calcium tungstate (scheelite [CaWO4]) and zirconium oxide (baddeleyite [ZrO2]), which were chemical components of the sealer cement. PMID:18037065

Escoda-Francoli, Jaume; Canalda-Sahli, Carles; Soler, Albert; Figueiredo, Rui; Gay-Escoda, Cosme

2007-12-01

67

Anaesthetic Challenges in Molar Pregnancy  

Directory of Open Access Journals (Sweden)

Full Text Available Gestational Trophoblastic Disease (GTD is a spectrum of tumours with a wide range of biologic behaviour and potential for metastases, which were often fatal in the past. However, with better understanding of patho-physiology in the last few years, most women can now be cured. A Hydatidiform Mole (or Molar Pregnancy is a benign Gestational Trophoblastic Disease that originates from the placenta. Treatment consists of vacuum evacuation but rarely hysterectomy may be required. Anaesthetic management is often complicated by the associated systemic derangements.

Ghansham Biyani

2013-06-01

68

Anaesthetic Challenges in Molar Pregnancy  

Directory of Open Access Journals (Sweden)

Full Text Available Gestational Trophoblastic Disease (GTD is a spectrum of tumours with a wide range of biologic behaviour and potential for metastases, which were often fatal in the past. However, with better understanding of patho-physiology in the last few years, most women can now be cured. A Hydatidiform Mole (or Molar Pregnancy is a benign Gestational Trophoblastic Disease that originates from the placenta. Treatment consists of vacuum evacuation but rarely hysterectomy may be required. Anaesthetic management is often complicated by the associated derangements.

Ghansham Biyani

2013-06-01

69

Mini-implants: mechanical resource for molars uprighting  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese INTRODUÇÃO: o tratamento ortodôntico precoce permite a correção das discrepâncias esqueléticas por meio do controle de crescimento e a eliminação de hábitos deletérios, que são fatores de risco para o desenvolvimento de más oclusões, que favorecem a correção do posicionamento dentário mais tardiamen [...] te, em uma segunda fase do tratamento. Durante o desenvolvimento da dentição e da oclusão, normalmente o segundo molar inferior chega à cavidade bucal após todos os dentes posicionados anteriormente a ele. Durante seu processo eruptivo, pode ocorrer uma condição chamada "impacção dentária", em que sua erupção completa é interrompida, exigindo tratamento apropriado para verticalização. Os dispositivos temporários de ancoragem permitem a desimpacção e a movimentação desses dentes diretamente às suas posições finais, sem a necessidade de cooperação do paciente e sem movimento de reação nas outras unidades da arcada. OBJETIVO: descrever o tratamento de um caso de má oclusão Classe II de Angle, realizado em duas fases, durante o qual foram utilizados mini-implantes para verticalização dos segundos molares inferiores impactados. Abstract in english INTRODUCTION: The early orthodontic treatment allows correction of skeletal discrepancies by growth control, and the elimination of deleterious habits, which are risk factors for the development of malocclusions, favoring for the correction of tooth positioning later in a second treatment stage. Dur [...] ing development of teeth and occlusion, the mandibular second molars commonly erupt in the oral cavity after all other teeth of the anterior region. In their eruptive process there may be a condition known as tooth impaction, which precludes its complete eruption and requires proper uprighting treatment. The temporary anchorage devices allow disimpaction and movement of these teeth directly to their final position, without the need of patient compliance or reaction movements in other parts of the arch. OBJECTIVE: This paper aims at describing a case report of the treatment of a patient with Angle Class II malocclusion, performed in two phases, in which mini-implants were used for uprighting the impacted mandibular second molars.

Susiane, Allgayer; Deborah, Platcheck; Ivana Ardenghi, Vargas; Raphael Carlos Drumond, Loro.

2013-02-01

70

Endodontic treatment in C-shaped molar  

Directory of Open Access Journals (Sweden)

Full Text Available Introduction: The C-shaped molar is an anatomical variationthat deserves careful attention in endodontic treatment due to itscharacteristic peculiarities. Objective and case report: This study aimed to review the scientific literature on this morphological alteration and to report a case of endodontic treatment of a C-shaped second molar. Conclusion: A good planning of all stages of the treatment is essential to reach success in endodontic treatment in C-shaped molars.

Kathrein Tapia da SILVA

2010-03-01

71

Permanent molars: Delayed development and eruption  

Directory of Open Access Journals (Sweden)

Full Text Available Delayed development and eruption of all the permanent molars is a rare phenomenon, which can cause disturbance in the developing occlusion. The eruption of permanent first and second molars is very important for the coordination of facial growth and for providing sufficient occlusal support for undisturbed mastication. In the case described, the first permanent molars were delayed in their development and were seen erupting at the age of nine and a half years. Severe disparity between the left and the right side of the dentition with respect to the rate of development of molars were also present.

Arathi R

2006-05-01

72

Positional relationship between the deciduous molar and the successional permanent teeth. Three-dimensional observation of the deciduous second molars and second premolars by X-ray CT  

International Nuclear Information System (INIS)

To investigate the positional relationship between the maxillo-mandibular deciduous second molars and the successional permanent teeth, the second premolars in the jaw bones, three-dimensional observation of dry skulls was performed using X-ray CT. The specimens were 30 dry skulls, comprising of 15 dry skulls in the deciduous dentition period and 15 dry skulls in the first half of the mixed dentition period. The following results were obtained: Regarding the observation of the horizontally sectioned images, measurement was performed by overlapping horizontally sectioned images of the outline form of the tooth crown of the deciduous second molars, and those of the bony crypt of the second premolars. In the maxillary bone, the bony crypt of the second premolars was mesio-distally within the outline form of the tooth crown of the diciduous second molars, whereas it was bucco-lingually on the palatal side. In the mandibular bone, although the bony crypt of the second premolars was bucco-lingually within the outline form of the tooth crown of the deciduous second molars, it was mesio-distally slightly on the distal side. By observing the position of the central point of the deciduous second molar tooth crown and that of the deciduous second molar tooth root, differences were noted in both the maxilla and mandible, and the distance between the 2 points was larger in the mandible. Furthermore, by observing the position of the central point of the deciduous second molar tooth point of the deciduous second molar tooth crown and that of the bony crypt of the second premolars, the distance was larger in the maxilla. Regarding the observation of the vertically sectioned images, bucco-lingual sections of the maxillo-mandibular deciduous second molars were observed. Differences in the inclination angle between the coronal axis of the deciduous second molars and the axis of the bony crypt were smaller in the maxilla than in the mandible. Therefore, it was speculated that the bony crypt was vertically located near the direction of the coronal axis of the deciduous second molars in the maxilla, and was in the inferior position of the crown of the deciduous second molars in the mandible. The vertical distance between the occlusal surface (cuspal mid-point) of the deciduous second molars and the superior edge point of the bony crypt of the second molars was 9.3 mm in the maxilla, and 9.8 mm in the mandible, and that between the occlusal surface of the deciduous second molars and the central point of the bony crypt was 14.4 mm in the maxilla, and 14.0 mm in the mandible, showing no significant differences between the maxilla and mandible. Concerning the positional relationship between the maxillo-mandibular deciduous second molars and the second premolars, these findings revealed that the bony crypts of the successional permanent teeth are not positioned in the central area of the deciduous tooth crowns, both bucco-lingually and mesio-distally, but in characteristic positions in both the maxilla and mandible. It was also found that differences in the mutual positional relationship were large in the maxilla, in particular. (author)

73

Enamel thickness of human maxillary molars reconsidered.  

Science.gov (United States)

Forty-four modern human maxillary molars (M1 = 21, M2 = 12, and M3 = 11) were sectioned through the mesial cusps in a plane perpendicular to the cervical margin of the crown. Eight measurements of enamel thickness as well as bucco-lingual (BL) and mesio-distal (MD) diameters were recorded for each tooth in order to investigate differences in these dimensions between tooth categories. Uni- and multi-variate analyses revealed first maxillary molars to have generally thinner enamel than second or third upper molars, especially with regard to the occlusal basin. Furthermore, the decrease of MD diameters from anterior to posterior is greater than that of BL diameters. Principal Component Analysis using enamel thickness measurements resulted in complete separation of first molars, while second and third maxillary molars showed a certain amount of overlap. This finding casts doubt on using an overall measure of "molar enamel thickness" derived from mixed samples of molars for taxonomic purposes. There appears to be a relationship between bite force and enamel thickness such that posterior molars, where masticatory forces are stronger, have thicker enamel than anterior teeth. It is suggested that the gradient of enamel thickness between (and within) teeth in extant and extinct species may thus provide further information about relative wear resistance as well as the biomechanical constraints of the orofacial skeleton. PMID:8273831

Macho, G A; Berner, M E

1993-10-01

74

Treating Intraradicular Pockets of molars  

Directory of Open Access Journals (Sweden)

Full Text Available It appears that until bone graft has not achieved 100% success, intraradicular diseases remain controversial and therefore, different treatment plans are suggested for them. Treating intraradicular diseases depend on many factors: maxillary molars are more prone to bone loss and have worse prognosis. To assess prognosis more carefully these factors should be considered: 1 bone loss: its apical depth, local or generalized 2 bone condition: buccal, lingual, mesial and distal aspects 3 tooth mobility: grades 2 and 3 have not good prognosis. Crown root ratio is also important. 4 the angle of divergence of roots: the more the roots are divergent, the better the prognosis would be. 5adjacent teeth health 6tooth position in jaws 7 age and general health of the patients 8 oral hygiene In general, teeth with 2 roots can be treated more effectively than 3 root ones. Maxillary first premolars are exceptions that do not respond to the treatments positively. We should look forward to the future investigations and findings.

H. Lotfizade

1987-10-01

75

Evaluation of Food Retention in Occlusal Surfaces of First Primary Molars / Evaluación de la Retención de Alimentos en las Superficies Oclusales de los Primeros Molares Temporales  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish Algunas características de los alimentos, como la viscosidad y consistencia, puede modificar el tiempo para el retiro de alimentos de la boca, así como favorecer la actividad de las bacterias cariogénicas, y el aumento de riesgo de caries dental. Este estudio tuvo como objetivos verificar la retenci [...] ón de alimentos en contacto con un sustrato cariogénico en niños de 24-30 meses de edad. 27 niños (54 dientes) fueron evaluados. Se realizo la ingesta de una galleta de chocolate, y la zona de retención del alimento fue documentada por la fotografía digital en dos tiempos de experimentación (to: 0 y t1: 30 minutos) y se calculó utilizando el software Image Tool 3.0. El índice de superficie (mm2) de retención de alimentos fue estadísticamente reducido (test de Wilcoxon, p = 0,001) después de 30 minutos para molares maxilares (to: 0,37 ± 0,04 y t1: 0,042 ± 0,015) y mandibulares (to:0,30 ± 0,03 y t1: 0,078 ± 0,019). No se observaron diferencias en El índice de superficie de retención de alimentos entre los grupos en el tiempo inicial. En el momento final, los molares inferiores muestran una zona de retención superiores a los maxilares (prueba de Mann-Whitney, p = 0,04). La prevalencia de la retención de alimentos en los molares inferiores fue más alta que los molares superiores (Chi cuadrado, p = 0,03). En conclusión, los primeros molares mandibulares primarios retienen más alimentos que los molares superiores, siendo concordante con los resultados clínicos de la prevalencia de caries. Abstract in english Some food characteristics, like stickiness and consistency, can modify the time for food removal from the mouth as well as favors the activity of cariogenic bacteria, increasing dental caries risk. This study aimed to observe food retention in contact with a cariogenic substrate in 24-30 months old [...] children. Therefore, 27 children (54 teeth) were evaluated. They intake a chocolate cookie and the food retention area was documented by digital photography in two experimental times (to: 0 and t1: 30 minutes) and it was calculated using Image Tool 3.0 software. The food retention surface index (mm2) was statistically reduced (Wilcoxon’s test, p=0.001) after 30 minutes for both maxillary (to: 0.37 ± 0.04 and t1:0.042 ± 0.015) and mandibular (to: 0.30 ± 0.03 and t1: 0.078 ± 0.019) molars. No differences were observed between the groups in food retention surface index at the initial time. At the final time, the mandibular molars show a higher retention area than the maxillary ones (Mann-Whitney’s test, p=0.04). The prevalence of food retention at the mandibular molars is higher than the maxillary molars (Chi Square’s test, p=0.03). In conclusion, first primary mandibular molars retain more food than the maxillary molars, being in agreement with clinical results of dental caries’ prevalence.

L. L, Meneghel; K. B. P, Fernandes; S. M. H, Lara; A, Ferelle; L, Sturion; L. R. F, Walter.

2010-09-01

76

Association between Peritonsillar Abscess and Molar Caries  

Directory of Open Access Journals (Sweden)

Full Text Available Background: Peritonsillar abscess is the most common deep neck infections that are related with periodontal disease which has the same pathogenesis. We determined the relationship between peritonsillar infection and molar caries. Methods: In a cross-sectional study, 33 consecutive patients whom referred to Hamadan university clinic of otolaryngologic for peritonsillar abscess were examined by otolaryngologist and dentist who investigated relationship between peritonsillar infection and molar caries. Results: There were 27 males and 6 females with mean age 26.7+_7 years. The frequency caries on ipsilateral peritonsillar infection sides was in relation to molars caries on opposite sides (conterol group. This corrolation was significant with odds ratio 2.5. Conclusion: Molar caries were seen 2.5 times more likely to have peritonsillar infection compared with normal molar sides. Key Words: Peritonsillar abscess, Infection, Periodontal disease, Dental caries

M Shayani Nasab

2006-05-01

77

Caries dental aguda del primer molar permanente en niños de 12 años / Acute dental caries of the first permanent molar in children younger than 12 years  

Scientific Electronic Library Online (English)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish Introducción: el primer molar permanente es considerado la llave de la oclusión dentaria, la presencia de caries en éste es elevada, lo que dificulta el logro de las metas trazadas por organizaciones de salud a nivel mundial en este grupo de edad. Objetivo: determinar el comportamiento de la caries [...] dental aguda en primer molar permanente en una población de 12 años de edad atendida en la Clínica Estomatológica Santa Cruz de la Parroquia Goaigoaza. Métodos: se realizó un estudio descriptivo transversal en la Clínica Estomatológica Santa Cruz. Parroquia Goaigoaza, municipio Puerto Cabello, estado Carabobo, en el período comprendido entre abril del 2009 a abril 2010. Se seleccionaron 97 pacientes de 12 años de edad los que constituyeron el universo y la muestra. Acudieron a la consulta por dolor debido a la presencia de caries dental aguda. Se registraron las variables: edad, sexo, grado clínico de la caries dental, estímulos externos que provocaron dolor, la cara dental y la arcada dentaria más afectadas. La información fue recogida mediante interrogatorio y examen clínico. Resultados: el sexo masculino representó el 63,9 %. La caries dental de 3er grado estuvo presente en un 68 %. Los estímulos externos que provocaron dolor fueron: el frío presente en 75,2 % y los alimentos dulces en 69,1 % en ambos sexos. El primer molar inferior derecho resultó más afectado (46,4 %) que el izquierdo (36,1 %), así como la arcada dentaria inferior (25,8 %) y la cara oclusal (64,9 %). Conclusiones: predominaron el sexo masculino y la caries dental aguda de 3er grado. El frío y los alimentos dulces fueron los estímulos externos más frecuentes. Los más afectados resultaron el primer molar inferior derecho, la cara oclusal y la arcada dentaria inferior. Abstract in english Introduction: the first permanent molar is considered the dental key to occlusion. The presence of caries here is high, hindering the achievement of goals set by various health organizations worldwide in this age group. Objetive: to determine acute dental caries behavior in the first permanent molar [...] within a 12 year-aged population, assisted at The Dental Clinic of Santa Cruz in Goaigoaza Parish. Method: a descriptive cross-sectional study was conducted in The Dental Clinic of Santa Cruz in Goaigoaza Parish, Puerto Cabello, Carabobo, from April 2009 to April 2010. 97 patients (12 year-aged) were selected to form the universe and sample. These patients came to consultation in pain due to the presence of acute dental caries. Variables were recorded such as: age, sex, clinical grade of dental caries, external stimuli causing pain, dental face and the most affected dental arch: the variables were. The information was collected by interview and clinical examination. Results: the males accounted for 63.9 %. 3rd grade dental caries were present in 68.0 %. External stimuli causing pain were cold (75.2 %) and sweet foods (69.1 %) in both genders. The lower right first molar was the more affected (46.4 %) than the left one (36.1 %), as well as the lower dental arch (25.8 %) and the occlusal face (64.9 %). Conclusions: acute 3rd grade dental caries and males patients predominated. Cold and sweet foods were the most frequent external stimuli, The lower right first molar, the occlusal face and lower dental arch were the most affected.

Daniel Enrique, Reyes Romagosa; Ireana Josefina, Baños Toirac; María Elena, Sánchez Iturriaga; Blanca Margarita, Rodríguez Martínez.

2013-09-01

78

Antibiotics in third molar surgery.  

Science.gov (United States)

The aim of this survey was to assess the knowledge and practice of Swiss dentists focusing on the use of antibiotics in prophylactic surgical removal of lower wisdom teeth. A postal survey was conducted among all 3288 dentists who are members of the Swiss Dental Society (SSO) representing nearly all dentists in Switzerland. The questionnaire consisted of 13 questions with mostly multiple-choice answers. Demographic profile, surgical experience, the use of antibiotics, and wound management, i.e. wound closure and the use of mouth rinse were assessed. A response rate of 55% was obtained. Most Swiss dentists perform surgical extractions in their practices. Of all dentists, 18.6% used antibiotics routinely, but a large variation was found comparing the three linguistic regions of Switzerland with the highest prescription rate of 48% in the French-speaking south-west of Switzerland. Fifty-two percent of dentists prescribed amoxicillin in a dose of 750 mg. Most often three daily doses were prescribed (47%). A postoperative regime was prescribed by 54.4% of dentists. French language (p=0.003), graduation from the university of Geneva (p=0.007), foreign diplomas (p<0.001), and dentists with diplomas awarded from 2001-2006 (p=0.004) showed a highly significant correlation with the use of antibiotics. In Switzerland, prophylactic antibiotics are used in third molar surgery. Antibiotic prescription however largely depends on geographical situation and dentist profiles. The assessment of antibiotic use in private practices is important in the light of growing evidence that antibiotic overuse may lead to development of multiresistant bacterial strains. In a second part results regarding wound management and mouth rinse will be presented. PMID:24671748

Vlcek, Daniel; Razavi, Amir; Kuttenberger, Johannes J

2014-01-01

79

Characteristic Findings on Panoramic Radiography and Cone-beam CT to Predict Paresthesia after Extraction of Impacted Third Molar.  

Science.gov (United States)

The purpose of this study was to compare findings on the relationship between impacted molar roots and the mandibular canal in panoramic and three-dimensional cone-beam CT (CBCT) images to identify those that indicated risk of postoperative paresthesia. The relationship between impacted molars and the mandibular canal was first classified using panoramic images. Only patients in whom the molar roots were either in contact with or superimposed on the canal were evaluated using CBCT. Of 466 patients examined using both panoramic and CBCT images, 280 underwent surgical extraction of an impacted molar, and 15 of these (5%) reported postoperative paresthesia. The spatial relationship between the impacted third molar root and the mandibular canal was determined by examining para-sagittal sections (lingual, buccal, inter-radicular, inferior, and combinations) obtained from the canal to the molar root and establishing the proximity of the canal to the molar root (in contact with or without loss of the cortical border and separate). The results revealed that darkening of the roots with interruption of the mandibular canal on panoramic radiographs and the inter-radicular position of the canal in CBCT images were characteristic findings indicative of risk of postoperative paresthesia. These results suggest that careful surgical intervention is required in patients with the above characteristics. PMID:25765570

Harada, Nana; Beloor Vasudeva, Subash; Matsuda, Yukiko; Seki, Kenji; Kapila, Rishabh; Ishikawa, Noboru; Okano, Tomohiro; Sano, Tsukasa

2015-01-01

80

Primer registro de Clastoptera sp. (Hemiptera: Cercopidae) en Harpalyce arborescens (Fabaceae) del bosque tropical deciduo de Tamaulipas, México / First record of Clastoptera sp. (Hemiptera: Cercopidae) in Harpalyce arborescens (Fabaceae) of the tropical deciduous forest in Tamaulipas, Mexico  

Scientific Electronic Library Online (English)

Full Text Available SciELO Mexico | Language: Spanish Abstract in spanish Se registra por primera vez la presencia de Clastoptera sp., asociada a Harpalyce arborescens, especie de árbol maderable de alto valor comercial del bosque tropical deciduo del estado de Tamaulipas. Los registros se delimitan a 2 localidades, ubicadas en 3 sitios: San Vicente y González, del munici [...] pio de Casas, en la zona sureste de la Sierra de Tamaulipas (23°25'35.76" N, 98°38'56.86" O; 382 m y 23°21'35.75" N, 98°38'21.06" O; 455 m) y en el ejido Morelos, municipio de Llera, en la parte media de la misma sierra (23°27'27.37" N, 99°05'09.41" O; 546 m). Abstract in english Castopetra sp. is reported for the first time associated to Harpalyce arborescens at a timber tree species of high commercial value of the tropical deciduous forest in Tamaulipas state. The records of the genus are restricted to 2 locations in 3 sites: San Vicente and González, municipality of Casas [...] in the southeast of the Sierra de Tamaulipas (23°25'35.76" N, 98°38'56.86" W; 382 m and 23°21'35.75" N, 98°38'21.06" W; 455 m), and the ejido Morelos municipality of Llera in the middle of the same range (23°27'27.37" N, 99°05'09.41" W; 546 m).

José Guadalupe, Martínez-Avalos; Manuel, Lara; Griselda, Gaona; Gerardo, Sánchez-Ramos.

1233-12-01

81

Molar Incisor Hypomineralization, Prevalence, and Etiology  

OpenAIRE

Aim. To evaluate the prevalence and possible etiological factors associated with molar incisor hypomineralization (MIH) among a group of children in Jeddah, Saudi Arabia. Methods. A group of 8-12-year-old children were recruited (n = 267) from the Pediatric Dental Clinics at the Faculty of Dentistry, King Abdulaziz University. Children had at least one first permanent molar (FPM), erupted or partially erupted. Demographic information, children's medical history, and pregnancy-related data wer...

Sulaiman Mohammed Allazzam; Sumer Madani Alaki; Omar Abdel Sadek El Meligy

2014-01-01

82

Subcutaneous emphysema during third molar surgery: a case report  

Scientific Electronic Library Online (English)

Full Text Available A extração de terceiros molares é o procedimento cirúrgico mais comum na prática diária em cirurgia oral, e complicações podem ocorrer a despeito da habilidade e experiência do cirurgião. Complicações observadas durante ou após extração de terceiros molares podem incluir dor, edema, sangramento, inf [...] ecção, perfuração de seio e dano nervoso. Felizmente, a incidência de tais eventos é baixa quando se emprega conduta adequada e boa técnica cirúrgica. O enfisema subcutâneo associado à extração dentária ocorre quando o ar da turbina de alta rotação é forçado para dentro dos tecidos moles através de um retalho rebatido e invade os tecidos adjacentes, causando edema, crepitação à palpação, e eventualmente espalhando-se pelos espaços teciduais dos planos fasciais. Embora seja raro, o enfisema subcutâneo iatrogênico pode ter conseqüências sérias e com risco de morte. É necessário ter cuidado com o uso de turbinas de alta rotação durante a realização de procedimentos cirúrgicos orais. A penetração de ar nos tecidos faciais não está limitada às extrações dentárias, e pode ocorrer também por outras vias de acesso, tais como dentes tratados endodonticamente, periodonto e lacerações de tecidos moles intraorais. Quando ocorre, o enfisema subcutâneo deve ser diagnosticado rapidamente e tratado adequadamente para diminuir o risco de outras complicações. Este relato apresenta um caso de enfisema subcutâneo ocorrido durante a extração de um terceiro molar inferior com emprego de turbina de alta rotação. O manejo do caso é descrito e os aspectos relacionados ao diagnóstico e à prevenção desta complicação cirúrgica são discutidos. Abstract in english Extraction of third molars is the most common surgical procedure performed in oral surgery on a daily basis and, despite surgical skills and expertise, complications may occur. Complications observed during or after third molar removal may include pain, swelling, bleeding, infection, sinus perforati [...] on and nerve damage. Fortunately, with a proper management and a good surgical technique, the incidence of such events is low. Subcutaneous emphysema associated with dental extraction occurs when the air from the high-speed dental handpiece is forced into the soft tissue through the reflected flap and invades the adjacent tissues, leading to swelling, crepitus on palpation and occasionally spreading through the tissue spaces of the fascial planes. Although rare, iatrogenic subcutaneous emphysema can have serious and potentially life-threatening consequences. Care should be taken when using air-driven handpieces. The access of air into the facial tissues is not limited to tooth extractions, but may also occur through other portals of entrance, such as endodontically treated teeth, periodontium and lacerations of intraoral soft tissues. When subcutaneous emphysema occurs, it must be quickly diagnosed and properly managed to reduce the risk of further complications. This report presents a case of subcutaneous emphysema occurred during extraction of a mandibular third molar extraction with the use of an air turbine handpiece. Case management is described and issues relative to the diagnosis and prevention of this surgical complication are discussed.

Umberto, Romeo; Alexandros, Galanakis; Francesco, Lerario; Gabriele Maria, Daniele; Gianluca, Tenore; Gaspare, Palaia.

83

Inferior rectus recession—an effective procedure?  

OpenAIRE

AIMS—To examine the postoperative stability of inferior rectus recession, with particular reference to the incidence of progressive overcorrection.?METHODS—The results of consecutive patients undergoing inferior rectus recession over a 3 year period were reviewed.?RESULTS—21 patients underwent inferior rectus recession, using an adjustable suture technique in all but three cases. In 16 patients additional vertical muscle surgery was performed at the time of the inferior rectus rec...

Scotcher, S.; O Flynn, E.; Morris, R.

1997-01-01

84

Pneumatization of bilateral inferior turbinates: case report  

OpenAIRE

Nasal turbinates are very important for normal nasal functions. Warming, humidification, filtration and regulation of air sow are the main functions of turbinates. Pneumatization of inferior turbinate which is known as inferior concha bullosa is an anatomic variation and less than the pneumatization of middle turbinate. Although usually asymptomatic, severe pneumatized and inferior hypertrophic turbinates can cause nasal obstruction and headache. Mostly; pneumatization of inferior turbinate i...

Fatih Akagun; Banu Atalay Erdogan; Fatih Bora

2013-01-01

85

Caries dental y necesidades de tratamiento en el primer molar permanente en escolares de 12 años de las escuelas públicas del municipio de Rionegro (Antioquia, Colombia, 2010 / Dental Caries and Treatment Needs in the First Permanent Molar [...  

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Full Text Available Antecedentes: es importante evaluar el primer molar permanente, ya que en edad escolar es el diente permanente más afectado por caries. La prevalencia de caries en estos dientes se ha asociado con la actividad futura de caries. Objetivo: determinar la prevalencia de caries y las necesidades de tratamiento de los primeros molares permanentes en la población escolar de 12 años de las escuelas oficiales del municipio de Rionegro (Antioquia. Métodos: se realizó un estudio descriptivo transversal en 808 escolares de 12 años de escuelas públicas del municipio. Se analizó la prevalencia de caries dental en el primer molar permanente por número y tipo de dientes afectados y de acuerdo con sexo, escolaridad, zona de residencia y afiliación al Sistema General de Seguridad Social en Salud (SGSSS. También se describieron las necesidades de tratamiento para cada primer molar permanente. Resultados: los molares inferiores presentaron la mayor prevalencia de caries dental en relación con las variables de afiliación al SGSSS, sexo y zona de residencia; en estas dos últimas variables se evidenció más afectación en el primer molar inferior derecho y concentración en este molar de las necesidades de tratamiento restaurativo. Conclusiones: aunque se cuenta con estudios previos sobre prevalencia de caries dental en el municipio que muestran cumplimiento de metas de la Organización Mundial de la Salud, son más escasos los estudios que evalúen de manera individual los primeros molares permanentes para orientar políticas de salud pública dirigidos a la preservación de estas importantes estructuras dentales. Background: Evaluation of the first permanent molar is important since it is the tooth that is most affected from dental cavities in schoolers. Caries prevalence of this molar has been associated with future caries activity. Objective: Determine caries prevalence and treatment needs in the first permanent molar of a 12-year-old population from public schools in the municipality of Rionegro (Antioquia. Methods: A descriptive study in 808 12-year-old school children from public schools in Rionegro was conducted. Caries prevalence in the first permanent molar was analyzed regarding number and type of teeth affected and association with sex, grade, zone of residence, and type of affiliation to the social security system (SSS. Needs for dental treatment in this molar were also described. Results: Lower molars were the most affected by dental caries in relationship with sex, SSS, and zone of residence; in the latter two dental cavities were more prevalent in the right lower first molar, tooth in which the need for restorative treatment is higher than the other first molars. Conclusions: Although there are previous studies on the dental health status in Rionegro and indicators show that the goals of the World Health Organization are being met, evaluative research focused on the first permanent molar is scarce and necessary given its importance for health public policymaking intended to preserve this teeth.

Anny Marcela Vivares Builes

2012-07-01

86

Third molar surgery: the patient's and the clinician's perspective  

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Full Text Available Abstract Background In this report, the problems of third molar surgery have been reviewed from the perspective of both patient and clinician; additionally an overall analysis of preoperative imaging investigations was carried out. Specifically, three main areas of interest were investigated: the prediction of surgical difficulty and potential complications; the assessment of stress and anxiety and finally the assessment of postoperative complications and the surgeon's experience. Findings In the first study, the prediction of surgical difficulty and potential injury to the inferior alveolar nerve was assessed. This was achieved by examining the patient's orthopantomograms and by using the Pederson Difficulty Index (PDI. Several radiological signs were identified and a classification tree was created to help predict the incidence of such event. In the second study, a prospective assessment addressing the patient's stress and anxiety pre-, intra- and postoperatively was employed. Midazolam was the active drug used against placebo. Objective and subjective parameters were assessed, including measuring the cortisol level in saliva. Midazolam was found to significantly reduce anxiety levels and salivary cortisol was identified as an accurate anxiety marker. In the third study, postoperative complications and the surgeon's experience were examined. Few patients in this study suffered permanent nerve dysfunction. Junior surgeons reported a higher complication rate particularly in trismus, alveolar osteitis, infection and paraesthesia over the distributions of the inferior alveolar and lingual nerves. In apparent contrast, senior surgeons reported higher incidence of postoperative bleeding. Discussion These studies if well employed can lead to favourable alteration in patient management and might have a positive impact on future healthcare service.

Jerjes Waseem

2009-10-01

87

Ossifying fibroma of the inferior turbinate.  

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Hypertrophy of inferior turbinate is a common condition, especially with nasal septum deviation. Sometimes, the cause of hypertrophy of inferior turbinate can be fibro-osseous lesions. Benign, rare, and non-aggressive fibro-osseous neoplasms such as ossifying fibroma can affect paranasal sinuses. Isolated inferior turbinate involvement is extremely rare in ossifying fibroma. In this article, we present a 28-year-old female suffering from nasal obstruction due to septal deviation and hypertrophy of inferior turbinate. Preoperative and postoperative investigation show that cause of hypertrophy of inferior turbinate is ossifying fibroma. To our knowledge, that this is the second case of ossifying fibroma reported in the English-language literature due to its isolated localization. However, if the patients with inferior turbinate hypertrophy are examined carefully, we can prevent unnecessary medical treatment and surgery for inferior turbinate hypertrophy. PMID:21595621

Pata, Yavuz Selim; Ekici, I??n Do?an; Cihangiro?lu, Mutlu; Do?an, Müzeyyen; Koçak, Ismail

2011-01-01

88

Oxygen from Hydrogen Peroxide. A Safe Molar Volume-Molar Mass Experiment.  

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Describes a molar volume-molar mass experiment for use in general chemistry laboratories. Gives background technical information, procedures for the titration of aqueous hydrogen peroxide with standard potassium permanganate and catalytic decomposition of hydrogen peroxide to produce oxygen, and a discussion of the results obtained in three…

Bedenbaugh, John H.; And Others

1988-01-01

89

Má oclusão Classe I de Angle tratada com extrações de primeiros molares permanentes / Angle Class I malocclusion treated with extraction of first permanent molars  

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Full Text Available SciELO Brazil | Languages: English, Portuguese Abstract in portuguese A má oclusão Classe I de Angle é caracterizada por uma relação anteroposterior normal nos molares, que pode ou não estar acompanhada por alterações esqueléticas - nos planos vertical ou transverso - ou dentárias. A biprotrusão, revelada pela inclinação acentuada dos incisivos superiores e inferiores [...] para vestibular, somada ao trespasse horizontal excessivo, faz com que o paciente fique mais exposto a traumas dentários, além de causar comprometimento estético. A escolha dos dentes a serem extraídos para a correção, geralmente, recai sobre os primeiros ou segundos pré-molares, devido à sua posição na arcada. Contudo, a extração do primeiro molar permanente, em função de algum comprometimento, por cárie ou restauração extensa, pode ser uma alternativa, proporcionando a manutenção de um dente hígido em detrimento de outro já manipulado. O presente caso, tratado de maneira incomum, pela extração dos quatro primeiros molares permanentes, foi apresentado à Diretoria do Board Brasileiro de Ortodontia e Ortopedia Facial (BBO), representando a categoria 2, como parte dos requisitos para a obtenção do título de diplomado pelo BBO. Abstract in english Angle Class I malocclusion is characterized by normal anteroposterior molar relationship, which may or may not be accompanied by skeletal changes-in the vertical or transverse planes-or dental changes. Bimaxillary dental protrusion, characterized by pronounced labial inclination of maxillary and man [...] dibular incisors combined with excessive overjet, expose patients to dental trauma and compromise aesthetics. In deciding which teeth to extract for Class I correction the first or second premolars are usually selected due to their location in the dental arch. However, the extraction of a first permanent molar compromised by caries or extensive restoration may be an alternative that ensures the preservation of a healthy tooth instead of one that has already been manipulated. This case, treated in an unusual manner by the extraction of four first permanent molars, was presented to the Brazilian Board of Orthodontics and Dentofacial Orthopedics (BBO) as representative of category 2, as part of the requirements for obtaining the BBO diplomate title.

Ivan Tadeu Pinheiro da, Silva.

2010-08-01

90

Traumatismos de veia cava inferior / Inferior vena cava injuries  

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Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese OBJETIVO: Avaliar a incidência, o perfil clínico e as estratégias operatórias dos ferimentos de Veia Cava Inferior (VCI). MÉTODOS: Foram analisados retrospectivamente os prontuários de 76 doentes com ferimento de VCI atendidos nos dois prontossocorros de Manaus, no período de janeiro de 1997 a julho [...] de 2002. Mecanismo de lesão, mortalidade, estado hemodinâmico, índice de trauma abdominal penetrante (PATI), achados intra-operatórios e conduta cirúrgica foram estudados. RESULTADOS: Quarenta e nove (65%) doentes sofreram lesão por arma branca, 26 (34%) por arma de fogo e um por traumatismo abdominal fechado. Quarenta e um (54%) doentes sobreviveram. Quase todos chegaram acordados, entretanto 40% estavam hipotensos (pressão arterial sistólica Abstract in english BACKGROUND: Injuries of inferior vena cava (IVC) require immediate and definitive action. Our objective is to evaluate the incidence, the clinical findings and the operative approach to IVC injuries. METHODS: We retrospectively studied 76 patients with IVC injuries treated in two Emergency Hospitals [...] of Manaus, AM, Brazil, from January 1997 to July 2002. Mechanisms of injuries, mortality, hemodynamic status, penetrating abdominal trauma index (PATI), intraoperative findings and surgical approach were among assessed data. RESULTS: Fourty-nine patients (65%) had stab wounds, 26 (34%) gunshot wounds, and one had blunt abdominal trauma. Fourty-one (54%) patients survived. Almost all patients entered the emergency room awake, although 40% were hypotensive (systolic blood pressure

Cleinaldo de Almeida, Costa; José Carlos Costa, Baptista-Silva; Lana Márcia Esteves, Rodrigues; Fabiana Lo Presti, Mendonça; Thiago Silveira, Paiva; Emil, Burihan.

2005-10-01

91

Estudo morfológico da polpa de molares de ratos Wistar frente a uma oclusão traumática experimental / Morphological study of the pulp of Wistar rats molars under experimental occlusal interference  

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Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese As alterações morfológicas pulpares, decorrentes de um estímulo externo experimental (interferência oclusal), foram estudadas, em nível de microscopia de luz. Utilizaram-se restaurações de amálgama, em sobreoclusão nos primeiros molares superiores direitos de dez ratos Wistar, divididos em 3 grupos [...] e sacrificados por perfusão transcardíaca com formol a 10%, aos 10, 20 e 30 dias. A avaliação foi feita nos molares inferiores direitos (lado experimental) e esquerdos (lado controle). As peças ósseas após descalcificação em solução de EDTA associada às microondas, seguiram técnica histológica de rotina e coloração por hematoxilina-eosina e tricrômico de Mallory. Verificou-se no lado controle uma reação intensa caracterizada por um posicionamento atípico dos odontoblastos, seguida pelo aparecimento de cálculos pulpares e posteriormente por uma aparente e uniforme acomodação tecidual em toda a polpa, com moderada incidência de fibras colágenas. No lado experimental, as alterações foram similares parecendo, porém, aumentar com o tempo, principalmente aos 30 dias, onde a imagem histológica era semelhante à do lado controle aos 10 dias. Os resultados obtidos permitiram concluir que a interferência oclusal provocou alterações no tecido conjuntivo pulpar tanto no lado experimental como no controle e que as mesmas foram proporcionais à direção dos movimentos mandibulares. Abstract in english Pulpal morphological alterations in mandibular molars of rats, resulting from an experimental external stimulus (occlusal interference), were studied using light microscopy. We placed amalgam restorations in supraocclusion in the right superior first molars of 10 Wistar rats divided into three group [...] s, which were sacrificed by transcardiac perfusion with 10% formalin, after 10, 20 and 30 days. The evaluation of the right (experimental side) and left (control side) inferior molars was made after decalcification of the bony specimens with EDTA solution associated with microwaves, followed by routine histologic technique and staining with HE and Mallory?s Trichrome. On the control side, an intense reaction characterized by an atypical positioning of the odontoblasts was observed, followed by the appearance of pulp stones and, subsequently, by an apparent and uniform accommodation of the tissue in the whole pulp, with moderate incidence of collagenous fibers. On the experimental side, the alterations were similar, but they apparently increased with time, specially after 30 days, when the histologic image was similar to that of the control side after 10 days. We can conclude that the occlusal interference induces alterations in the pulpal connective tissue both on the experimental side and on the control side, and they are proportional to the direction of the mandibular movements.

Luiz Alberto Plácido, PENNA; Sigmar de Mello, RODE.

2000-06-01

92

Ectopic molar pregnancy: a case report  

OpenAIRE

The incidence of hydatidiform moles is 1 per 1,000 pregnancies. Ectopic pregnancy occurs in 20 per 1,000 pregnancies. Thus, the incidence of the ectopic molar gestation is very rare. We report a case of tubal molar pregnancy diagnosed at the systematic histology exam of an ectopic pregnancy. We report the case of 32 years old nulliparus women who presented a vaginal bleeding, lower abdominal pain and 6 weeks amenorrhea corresponding to the last menstrual period. At the clinical examination, t...

Bousfiha, Najoua; Erarhay, Sanaa; Louba, Adnane; Saadi, Hanan; Bouchikhi, Chahrazad; Banani, Abdelaziz; Fatemi, Hind El; Sekkal, Med; Laamarti, Afaf

2012-01-01

93

Traumatismos de veia cava inferior Inferior vena cava injuries  

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Full Text Available OBJETIVO: Avaliar a incidência, o perfil clínico e as estratégias operatórias dos ferimentos de Veia Cava Inferior (VCI. MÉTODOS: Foram analisados retrospectivamente os prontuários de 76 doentes com ferimento de VCI atendidos nos dois prontossocorros de Manaus, no período de janeiro de 1997 a julho de 2002. Mecanismo de lesão, mortalidade, estado hemodinâmico, índice de trauma abdominal penetrante (PATI, achados intra-operatórios e conduta cirúrgica foram estudados. RESULTADOS: Quarenta e nove (65% doentes sofreram lesão por arma branca, 26 (34% por arma de fogo e um por traumatismo abdominal fechado. Quarenta e um (54% doentes sobreviveram. Quase todos chegaram acordados, entretanto 40% estavam hipotensos (pressão arterial sistólica BACKGROUND: Injuries of inferior vena cava (IVC require immediate and definitive action. Our objective is to evaluate the incidence, the clinical findings and the operative approach to IVC injuries. METHODS: We retrospectively studied 76 patients with IVC injuries treated in two Emergency Hospitals of Manaus, AM, Brazil, from January 1997 to July 2002. Mechanisms of injuries, mortality, hemodynamic status, penetrating abdominal trauma index (PATI, intraoperative findings and surgical approach were among assessed data. RESULTS: Fourty-nine patients (65% had stab wounds, 26 (34% gunshot wounds, and one had blunt abdominal trauma. Fourty-one (54% patients survived. Almost all patients entered the emergency room awake, although 40% were hypotensive (systolic blood pressure < 70 mmHg, and the penetrating abdominal trauma index average was above 40. At laparotomy, active retroperitoneal bleeding or an expanding retroperitoneal hematoma were detected in all cases. Caval injury was retro-hepatic in 21 patients, and infrahepatic in the other 55. The prevailing surgical approach was lateral repair in 65 patients. Atrial-caval shunting was tried in six patients, with only three survivals. CONCLUSIONS: We concluded that IVC injury remains a highly lethal injury and there is a close relationship with urban violence. This study emphasizes that successful outcome depends on prompt volume restoration, avoidance of hypothermia and a stratified selective surgical approach.

Cleinaldo de Almeida Costa

2005-10-01

94

Evaluation of effects of two dexamethasone formulations in impacted third molar surgeries / Avaliação dos efeitos de duas formulações de dexametasona em cirurgias de terceiros molares inclusos  

Scientific Electronic Library Online (English)

Full Text Available JUSTIFICATIVA E OBJETIVOS: A utilização da injeção submucosa de dexametasona diretamente na área cirúrgica tem sido realizada em vários procedimentos odontológicos, mas ainda são escassos os estudos que avaliaram a sua eficácia em comparação com a via oral para exodontias de terceiros molares inclu [...] sos. Desta forma, o objetivo do presente estudo foi avaliar a dor, edema e trismo no pós-operatório de cirurgia de terceiros molares inclusos utilizando-se dexametasona, por via oral, ou por injeção local submucosa. MÉTODOS: Estudo prospectivo, controlado, cruzado e randomizado envolvendo 36 pacientes com indicação cirúrgica de terceiros molares inferiores que foram divididos em dois grupos: grupo A injeção local submucosa de dexametasona (4mg/1mL) após a anestesia local e grupo B - 1 comprimido de dexametasona (4mg), por via oral, uma hora antes do procedimento. Edema e trismo foram avaliados clinicamente no pré-operatório, 1º, 2º, 3º e 7º dia de pós-operatório. Os pacientes foram orientados a registrar a intensidade de dor na escala analógica visual nos períodos zero (pré-operatório), 1h, 2h, 4h, 12h, 1 dia, 2 dias, 3 dias e uma semana após as cirurgias. Os dados obtidos foram submetidos a análise estatística com nível de significância de 5%. RESULTADOS: Não revelaram diferenças significativas no tempo cirúrgico em relação aos lados operados (p=0,4). Os valores de edema facial e trismo não demonstraram diferenças estatisticamente significativas entre os grupos observados (p>0,05). Os valores médios de dor registrados na escala analógica visual não mostraram diferença estatística significativa entre os grupos e os pacientes não relataram grande desconforto pós-operatório e não necessitaram prolongar o fármaco analgésico (p>0,05). CONCLUSÃO: As duas vias de administração da dexametasona mostraram-se eficazes no controle da dor, edema e trismo após cirurgias de terceiros molares inferiores, apresentando resultados semelhantes. Abstract in english BACKGROUND AND OBJECTIVES: Submucosal dexamethasone injection directly in the surgical area has been used in different dental procedures, but there are still few studies evaluating its efficacy as compared to oral route for impacted third molar surgeries. So, this study aimed to evaluate postoperat [...] ive pain, edema and trismus after impacted third molar surgeries using oral or submucosal local injection of dexamethasone. METHODS: This was a prospective, controlled, crossover and randomized study involving 36 patients with indication of lower third molar surgeries, who were randomly distributed in two groups: group A - submucosal local injection of dexamethasone (4mg/1mL) after local anesthesia, and group B - oral dexamethasone tablet (4mg) one hour before procedure. Edema and trismus were clinically evaluated in the postoperative period and in the 1st, 2nd, 3rd and 7th postoperative days. Patients were oriented to record pain intensity in the visual analog scale in periods zero (preoperative), 1h, 2h, 4h, 12h, 1 day, 2 days and 3 days and one week after surgery. Data were submitted to statistical analysis with significance level of 5%. RESULTS: There were no significant differences in surgical time with regard to operated sides (p=0.4). Edema and trismus values were not statistically different between observed groups (p>0.05). Mean pain values recorded in the visual analog scale were not statistically different between groups and patients have not reported major postoperative discomfort and had no need to prolong analgesic medication (p>0.05). CONCLUSION: Both dexamethasone administration routes were effective to control pain, edema and trismus after lower third molar surgeries, presenting similar results.

Marsal Moretto, Noboa; Juliana Cama, Ramacciato; Rubens Gonçalves, Teixeira; Carllini Barroso, Vicentini; Francisco Carlos, Groppo; Rogério Heládio Lopes, Motta.

2014-09-01

95

Uncertainty assessment of Si molar mass measurements  

Science.gov (United States)

The uncertainty of the Si molar mass measurement is theoretically investigated by means of a two-isotope model, with particular emphasis to the role of this measurement in the determination of the Avogadro constant. This model allows an explicit calibration formula to be given and propagation of error analysis to be made. It also shows that calibration cannot correct for non-linearity.

Mana, G.; Massa, E.; Valkiers, S.; Willenberg, G.-D.

2010-01-01

96

Ectopic molar pregnancy: a case report.  

Science.gov (United States)

The incidence of hydatidiform moles is 1 per 1,000 pregnancies. Ectopic pregnancy occurs in 20 per 1,000 pregnancies. Thus, the incidence of the ectopic molar gestation is very rare. We report a case of tubal molar pregnancy diagnosed at the systematic histology exam of an ectopic pregnancy. We report the case of 32 years old nulliparus women who presented a vaginal bleeding, lower abdominal pain and 6 weeks amenorrhea corresponding to the last menstrual period. At the clinical examination, the arterial pressure was 100/60 mmHG. The gynecological examination was difficult because of lower abdominal pain. Serum gonadotropin activity was 3454 ui/l. Pelvic ultrasound revealed an irregular echogenic mass in the left adnexa. Diagnostic laparoscopy revealed a left-sided unruptured ampullary ectopic pregnancy. A left laparoscopic salpingectomy was performed. The systematic histologic test identified an ectopic partial molar pregnancy, which was confirmed by DNA ploidy image analysis. The patient was followed with weekly quantitative B-hCG titers until three successive B-hCG levels were negative. It is pertinent that clinicians take routine histological examination of tubal specimens in ectopic pregnancy very seriously in order to diagnose cases of ectopic molar gestations early and mount appropriate post treatment surveillance. PMID:22655097

Bousfiha, Najoua; Erarhay, Sanaa; Louba, Adnane; Saadi, Hanan; Bouchikhi, Chahrazad; Banani, Abdelaziz; El Fatemi, Hind; Sekkal, Med; Laamarti, Afaf

2012-01-01

97

Inferior epigastric artery angiography applied in the transplantation with the deep inferior epigastric perforator free flap  

International Nuclear Information System (INIS)

Objective: To observe the effect of inferior epigastric artery angiography applied in the transplantation with the deep inferior epigastric perforator free flap. Methods: Seven patients who had undergone the deep inferior epigastric perforator free flap transplantation, received angiography of the inferior epigastric artery. The value of the angiography was discussed. Results: All patients were successful in angiography without any adverse reaction. All patients were successful in transplantation except one because of personal reason. Conclusion: Inferior epigastric artery angiography facilitates the transplantation with the deep inferior epigastric perforator free flap. (authors)

98

Estágio de mineralização dos terceiros molares e sua relação com a idade cronológica: uma amostra da população do Centro-Oeste do Brasil / Third molars stage of mineralization and its relation to chronological age: Midwest Brazil sample  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese INTRODUÇÃO: Nos últimos anos, alguns estudos foram conduzidos com o objetivo de avaliar a aplicabilidade da análise de desenvolvimento dos terceiros molares na estimativa da idade humana. No entanto, há escassez de trabalhos em amostras populacionais da região Centro-Oeste do Brasil. OBJETIVO: [...] Avaliar a relação entre estágio de desenvolvimento dos terceiros molares inferiores e a idade cronológica de indivíduos da região Centro-Oeste do Brasil. MATERIAL E MÉTODO: Trata-se de um estudo observacional transversal, com uma amostra constituída por 120 prontuários de pacientes entre 5 e 22 anos de idade, dos gêneros masculino e feminino, atendidos entre os anos de 2007 e 2012 na nossa instituição. O estágio de desenvolvimento dos terceiros molares inferiores foi avaliado pelo método descrito por Nolla e relacionado à idade cronológica do indivíduo por meio de regressão linear, sendo considerados significantes valores de tendência linear entre 0 e 1. RESULTADO: Pode-se observar que tanto a amostra composta por pacientes do gênero masculino (R2 = 0,7495) quanto do feminino (R2 = 0,8507) apresentaram correlação linear entre o estágio de desenvolvimento dos terceiros molares inferiores e a idade cronológica. Notou-se, ainda, que os estágios de desenvolvimento coincidiram com idades semelhantes em ambos os gêneros. CONCLUSÃO: Há relação entre a idade cronológica e o estágio de desenvolvimento dos terceiros molares inferiores na amostra estudada. Estes dados sugerem que este tipo de análise deve ser individualizada, de acordo com as características populacionais da região. Abstract in english INTRODUCTION: In recent years some studies have been taken to evaluate the applicability of the third molar development analysis in the estimation of human age. However, just a few studies with the population from Midwest Brazil were performed. OBJECTIVE: The present study aim to analyze the r [...] elationship between the lower third molars development stage and the chronological age of individuals in Midwest Brazil region. MATERIAL AND METHOD: This cross-sectional observational study comprised a total of 120 panoramic radiographies of patients aged 5-22 year-old, males and females, attended between 2007 and 2012 at our Institution. The third molars development stage was analyzed based on the method described by Nolla and related with the chronological age of the individual by linear regression. It was considered significant values for linear tendency between 0-1. RESULT: It was observed that both, male patients (R2 = 0.7495) and females (R2 = 0.8507), showed a linear correlation between the third molars development stage and chronological age. It was also noted that the development stages coincided with similar ages in both genders. CONCLUSION: There is a relationship between chronological age and developmental stage of the third molars in the sample studied. These data suggest that this type of analysis should be individualized according to the population characteristics.

Alyne de Carvalho, GUNDIM; Ana Paula, SOUSA; Jéssica Caroline, SILVA; Renata de, OLIVEIRA; Fernanda Paula, YAMAMOTO-SILVA; Brunno Santos de Freitas, SILVA.

2014-09-01

99

Intra-sinusal third molar: Case report  

Directory of Open Access Journals (Sweden)

Full Text Available Ectopic tooth eruption into an area other than the oral cavity is rare. Nasal septum, mandibular condyle, coronoid process and infratemporal fossa space have been reported as frequent locations for ectopic tooth eruption. Ectopic teeth located within the maxillary sinus may be asymptomatic, found only in routine examinations. Headache, sinusitis and nasal obstruction are some of the associated symptoms. The differential diagnosis includes foreign bodies (rhinolith, infections (syphilis and tuberculosis, benign lesions (hemangioma, osteoma, calcifi ed polyp and malign lesions (osteosarcoma. Upper third molars located within the maxillary sinus may be associated with the development of mucocele or dentigerous cyst. The aim of this paper was to describe the case of a 24-year old female patient with an ectopic right upper third molar in the maxillary sinus. A hyperdense area was observed with sinus obliteration, consistent with mucous material.

Frederico Sampaio Neves

2011-01-01

100

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available BREAST RECONSTRUCTION: DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00:00:24 WOMAN 1: ... surgery each of them chose to undergo. The deep inferior epigastric perforator flap technique allows surgeons to ...

101

Dens in dente of maxillary third molar  

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Full Text Available ?Dens in dente,? also known as dens invaginatus, is a developmental anomaly resulting from deepening or invagination of the enamel organ into the dental papilla, which begins at the crown and often extends to the root before calcification of the dental tissues. Dens in dente commonly occur in the maxillary lateral incisor. This article reports a case of dens in dente in the maxillary third molar.

Subramaniam Arun

2008-01-01

102

Dens in dente of maxillary third molar  

OpenAIRE

?Dens in dente,? also known as dens invaginatus, is a developmental anomaly resulting from deepening or invagination of the enamel organ into the dental papilla, which begins at the crown and often extends to the root before calcification of the dental tissues. Dens in dente commonly occur in the maxillary lateral incisor. This article reports a case of dens in dente in the maxillary third molar.

Subramaniam Arun; Kamtane Smita; Desai Rajiv; Thakre Gauri

2008-01-01

103

Compromised first permanent molars: an orthodontic perspective.  

Science.gov (United States)

The first permanent molar (FPM) is commonly subject to significant compromise which may arise due to caries or endodontic complication, or from developmental anomalies such as hypoplasia. Compromised teeth with questionable prognosis may result in short and long-term clinical dilemmas. This review article highlights the factors that require careful consideration when a compromised FPM is detected and the importance of timely FPM extraction. Several clinical cases are described in detail to discuss possible treatment options from the orthodontic perspective. PMID:20415906

Ong, D C-V; Bleakley, J E

2010-03-01

104

Assessment of the relationship between the mandibular third molar and the mandibular canal using panoramic radiograph and cone beam computed tomography  

International Nuclear Information System (INIS)

The purpose of this study is to evaluate the position of the mandibular canal in relation to the mandibular third molar by cone beam CT in cases showing a close relationship between the third molar and the mandibular canal on the panoramic radiograph. The panoramic images and cone beam CT scans of 87 impacted mandibular third molars in 60 patients were evaluated to assess the tooth relationship to the mandibular canal. The clearness of the canal wall and the vertical depth of the lower third molar were evaluated on panoramic radiographs. The lower third molars were assessed using cone beam CT to determine the proximity and position of the canal relative to the roots. In the 66 cases where the canal wall was unclear on the panoramic radiographs, 58 (87.9%) of the third molars had contact between the canal and root; 34 (51.5%) canals were showed an inferior position and 22 (33.3%) showed a linguoinferior position on cone beam CT. Interruption of the canal wall on panoramic radiographs was highly predictive of contact between the mandibular canal and the third molar. Cross sectional CT may be indicated for localization of the mandibular canal in such cases.

105

Pneumatization of bilateral inferior turbinates: case report  

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Full Text Available Nasal turbinates are very important for normal nasal functions. Warming, humidification, filtration and regulation of air sow are the main functions of turbinates. Pneumatization of inferior turbinate which is known as inferior concha bullosa is an anatomic variation and less than the pneumatization of middle turbinate. Although usually asymptomatic, severe pneumatized and inferior hypertrophic turbinates can cause nasal obstruction and headache. Mostly; pneumatization of inferior turbinate is detected incidentaly on paranasal computerized tomography. Treatment is not always necessary but in some symptomatic cases surgery may be required. There is no consensus about surgical management. Paranasal sinus and turbinate surgical treatment focuses on techniques that affect the functions of the lowest rate. In this report, a 35 year old inferior concha bullosa case who suffers from nasal obstruction is presented and the symptomatology, diagnosis and treatment options are discussed.

Fatih Akagun

2013-01-01

106

[Injury of inferior vena cava].  

Science.gov (United States)

Results of treatment of 102 patients with injuries of inferior vena cava (IVC) were analyzed. The causes of injury were penetrating stab-incised wounds of abdomen (67.5% patients), close trauma (28.2%), gunshot wounds (4.3%). Zone of confluence of iliac veins was injured in 7% patients, infrarenal and renal segments -- in 51.9%, suprarenal -- in 21.5%, supra- and retrohepatic -- in 19.6% patients. Injury of one wall of vein was revealed in 63.7% patients, both walls -- in 14.7%, complete disruption of vessel -- in 7.9%, avulsion or fissure of hepatic veins -- in 13.7%. In 96.2% patients trauma of IVC were associated with injuries of liver (37.2% cases), small intestine (26.4%), stomach (15.6%), pancreas (12.7%), duodenum (10.7%), large intestine (6.8%), and other organs (10.7%). The side suture (83.7%), circular one (5%), ligation of vein (6.2%), grafting (3.8%), and ligation of left hepatic vein (1.3%) were performed. Reconstructive surgery was carried out by general surgeon in 30% patients, and by vascular surgeon -- in 70%. Lethality was 53.9% (55 patients). Lethality after injuries of supra- and retrohepatic segments of IVC was 100%, suprarenal and renal segments -- 60.6%, infrarenal segment -- 30.6%. PMID:16710217

Baeshko, A A; Klimovich, V V; Voevoda, M T; Orlovski?, Iu N; Gornosta?, P V; Iushkevich, V A

2006-01-01

107

Metabolitos secundarios y patrón de selección de dietas en el bosque deciduo tropical de los llanos centrales venezolanos / Secondary metabolites in a tropical deciduous forest vegetation of the Venezuelan central plains  

Scientific Electronic Library Online (English)

Full Text Available Mediante el tamizaje fitoquímico se investigó la presencia de algunos grupos de metabolitos secundarios (fenoles, taninos condensados, saponinas, cianógenos y alcaloides) en la biomasa comestible de cuarenta y uno especies presentes en la vegetación del bosque deciduo tropical de los Llanos Centrale [...] s de Venezuela. El 44% de las especies encontradas correspondieron a plantas leguminosas. La subfamilia Mimosoide agrupó al 50% de los casos; mientras que Faboide y Caesalpinoide estuvieron presentes en el 28 y 22%, respectivamente. Los fenoles (83%) y los alcaloides (61%) fueron los metabolitos de mayor distribución general. Las combinaciones cuádruples de grupos secundarios fueron las más abundantes en leguminosas (33%) y la doble en las no leguminosas (61%). En algunas de las especies más representativas se observó un efecto marcado de la época, el tipo de bosque y la ubicación geográfica, en la presencia de dichos grupos funcionales. Sin embargo, dependió de las particularidades fitoquímicas en cada caso. Mediante pruebas microhistológicas se observó un amplio rango de aceptabilidad por parte de los bovinos y caprinos.  En sentido general, los bovinos consumieron ávidamente aquellas especies con pocas combinaciones de metabolitos, mientras que los caprinos no mostraron preferencias específicas. Se concluye que las especies analizadas contienen en su biomasa algunos metabolitos secundarios cuya presencia en algunos casos varía con la época, el tipo de bosque y su ubicación. Los fenoles y los alcaloides son los grupos que requieren mayor atención en cuanto a su posible repercusión antinutricional, por su elevada distribución en la vegetación. Abstract in english The presence of some groups of secondary metabolites (phenols, condensed tannins, saponins, cyanogens and alkaloids) in the edible biomass of 41 species in the tropical deciduous forest vegetation of the Central Plains, Venezuela were investigated. Forty four per cent of the species corresponded to [...] leguminous plants. The Mimosoide subfamily contained 50% of the cases; while Faboide and Caesalpinoide were present in 28 and 22%, respectively. Phenols (83%) and alkaloids (61%) showed a greater general distribution. The quadruple combinations of secondary groups were the most abundant in leguminous (33%) and the double in non leguminous species (61%). In some representative species, a marked effect of the season, the forest type, and the geographical location were observed. However, it depended of the phytochemical particularities. By microhistological tests a wide range of acceptability were observed. In general, cattle consumed eagerly species with few metabolites combinations; while goats showed non specific preferences. The edible biomass of analyzed species contains some secondary metabolites groups whose presence, in some cases, varies with season, the forest type and location. Phenols and alkaloids are the groups that require bigger attention for their possible antinutricional repercussion.

Alfredo, Baldizán; Carlos, Domínguez; Danny E, García; Eduardo, Chacón; L, Aguilar.

2006-09-01

108

"Nangañaña" (Tremelloscypha gelatinosa, Sebacinaceae), hongo silvestre comestible del bosque tropical deciduo en la depresión central de Chiapas, México / "Nangañaña" (Tremelloscypha gelatinosa, Sebacinaceae), a wild edible fungus from the tropical deciduous forest of the Central Chiapas Basin, Mexico  

Scientific Electronic Library Online (English)

Full Text Available Se presenta información sobre el uso de los esporomas de Tremelloscypha gelatinosa como alimento por los habitantes nativos de Nandayalu, una localidad al SE de Tuxtla Gutiérrez, Chiapas, México. El hongo es localmente llamado "nangañaña", los cuerpos fructíferos se recogen durante parte de la tempo [...] rada de lluvias (julio-agosto) y se usan para consumo familiar. Se describe el método de recolección y de preparación, y se presentan fotografías de sus basidiomas, de su hábitat y usos. La especie se registró fructificando en el suelo, bajo árboles de Gymnopodium floribundum, en bosque tropical deciduo en la depresión central de Chiapas. Tremelloscypha gelatinosa es un heterobasidiomiceto del orden Sebacinales y su relación filogenética con especies que forman micorrizas sugiere su posible relación ectomicorrízica con las raíces de las plantas y, por tanto, desempeñando una importante función ecológica en los ecosistemas tropicales donde se desarrolla. Es un hongo poco frecuente, hasta ahora registrado de Jamaica (localidad tipo), Florida (E.U.A.), Yucatán y Quintana Roo (México). No se tenía conocimiento de su uso como elemento comestible silvestre. Abstract in english We present information on the use of sporomes of Tremelloscypha gelatinosa as a food source among native people from Nandayalu, a locality situated SE of Tuxtla Gutiérrez, Chiapas, Mexico. The fungus is locally named "nangañaña" and its fruit bodies are collected during part of the rainy season (Jun [...] e-August) and are used for familiar consumption. Their methods of collecting and preparation are described and photographs of the basidiomes and habit are provided. Tremelloscypha gelatinosa was found growing below trees of Gymnopodium floribundum in the tropical deciduous forest of the Central Chiapas basin. It is a heterobasidiomycete belonging to the order Sebacinales and its phylogenetic placement among proven ectomycorrhizal sebacinoid species suggests its probable ectomycorrhizal symbiosis with plant roots, thus playing a relevant ecological role in tropical ecosytems where it occurs. Tremelloscypha gelatinosa is an infrequently encountered fungus, currently known from Jamaica (type locality), Florida (USA), Yucatán and Quintana Roo (Mexico) and until now unreported as a wild edible fungus.

Victor, Manuel Bandala; Leticia, Montoya; Rafael, Villegas; Teresa Guadalupe, Cabrera; Manuel de Jesús, Gutiérrez; Tomás, Acero.

2014-01-01

109

Transposition surgery for inferior rectus fibrosis.  

Science.gov (United States)

Congenital fibrosis of the extraocular muscles is a rare hereditary strabismus disorder. A case of congenital fibrosis of the inferior rectus muscles with severe chin-up posture and bilateral limitation of up gaze is reported. Bilateral large recessions of the tight inferior rectus muscles provided only partial improvement. Residual head posture and hypotropia were successfully corrected with bilateral horizontal rectus muscle transpositions toward the superior rectus muscles, despite persistently tight inferior rectus muscles at the time of surgery. [J Pediatr Ophthalmol Strabismus. 2015;52:e1-e3.]. PMID:25735010

Al-Haddad, Christiane E; Abdulaal, Marwan

2015-01-01

110

Anomalies of the vena cava inferior  

International Nuclear Information System (INIS)

Two cases of anomalous inferior vena cava are presented, with the emphasis on embryology. The firts patient was investigated by venography for a clinically proven varicocele as a probable cause of infertility. A double inferior vena cava was found during venography, and was confirmed by computed tomography (CT). In the second case a left-sided inferior vena cava was an incidental finding when a CT scan was done as a diagnostic procedure in a case of Hodgkin's disease. A short summary of the embryology and the significance of the variants is presented

111

Molar Pregnancy Presents as Tubal Ectopic Pregnancy  

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Full Text Available Hydatidiform moles are abnormal gestations characterized by the presence of hydropic changesaffecting some or all of the placental villi. Hydatidiform moles arise as a result of the fertilizationof an abnormal ovum. In this report, the patient was a 29 year old Asian woman who had inductionof ovulation with letrozol. Since the majority of molar gestations arise within the uterine cavitythus the occurrence of a hydatidiform mole within ectopic gestational tissue is rare. It is importantto differentiate a hydatidiform mole from a conventional ectopic pregnancy, particularly in infertilewomen who have a history of ovulation induction.

Fatemeh Davari Tanha

2011-01-01

112

Restauraciones cerámicas en molares jóvenes con endodoncia Ceramics restorations in young molars with endodontic  

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Full Text Available Objetivo: Efectuar restauraciones cerámicas Cerec (feldespática y de dióxido de circonio en molares jóvenes con endodoncia, para prevenir complicaciones en el aparato estomatognático por la pérdida de estos dientes. Material y métodos: Se describe la confección de restauraciones cerámicas a nivel de la zona molar mandibular derecha de un paciente del género femenino de 18 años de edad, a quien se le realizó radiografía periapical, por presentar dolor espontáneo en el lado derecho mandibular. Se diagnosticó una pulpitis irreversible en el primer y segundo molar que fue tratada endodónticamente. Las restauraciones cerámicas de ambos molares fueron confeccionadas con los sistemas CAD/CAM Cerec y evaluadas clínicamente a los 6 y 12 meses, de acuerdo a los criterios establecidos por el Servicio de Salud Pública de los Estados Unidos (USPHS. Resultados: La evaluación clínica evidenció que las estructuras de cerámica feldespática y de dióxido de circonio ofrecen en el lapso evaluado, adecuada forma anatómica, adaptación marginal, estabilidad en el color, ausencia de caries recidiva a nivel de dientes del sector posterior con tratamiento endodóntico y aceptación del paciente.Purpose: Make a ceramic restoration (feldsphatic and zirconium dioxide in young molars with endodontic treatment, to prevent further complications in the stomatognathic apparatus for the loss of these teeth. Material and methods: It describes the making of ceramic restorations in the right mandibular molar area to a female patient of 18 years old, to whom it was made a periapical radiography, for presenting spontaneous pain on the mandibular right side. It was diagnosed as an irreversible pulpitis at the first and second molar, that were treated endodontically. The ceramic restorations of both molars were made with the Cerec CAD/CAM system and were examined after 6 and 12 months in accordance with the US Public Health Service (USPHS criteria at baseline. Results: The clinical evaluation showed that the structures of feldspathic ceramic and zirconium dioxide in the offer period evaluated presented, proper anatomical shape, marginal adaptation, color stability, absence of recurrence cavities in the posterior teeth with endodontic treatment and acceptance of the patient.

M. Urdaneta Quintero

2009-12-01

113

Restauraciones cerámicas en molares jóvenes con endodoncia / Ceramics restorations in young molars with endodontic  

Scientific Electronic Library Online (English)

Full Text Available Objetivo: Efectuar restauraciones cerámicas Cerec (feldespática y de dióxido de circonio) en molares jóvenes con endodoncia, para prevenir complicaciones en el aparato estomatognático por la pérdida de estos dientes. Material y métodos: Se describe la confección de restauraciones cerámicas a nivel d [...] e la zona molar mandibular derecha de un paciente del género femenino de 18 años de edad, a quien se le realizó radiografía periapical, por presentar dolor espontáneo en el lado derecho mandibular. Se diagnosticó una pulpitis irreversible en el primer y segundo molar que fue tratada endodónticamente. Las restauraciones cerámicas de ambos molares fueron confeccionadas con los sistemas CAD/CAM Cerec y evaluadas clínicamente a los 6 y 12 meses, de acuerdo a los criterios establecidos por el Servicio de Salud Pública de los Estados Unidos (USPHS). Resultados: La evaluación clínica evidenció que las estructuras de cerámica feldespática y de dióxido de circonio ofrecen en el lapso evaluado, adecuada forma anatómica, adaptación marginal, estabilidad en el color, ausencia de caries recidiva a nivel de dientes del sector posterior con tratamiento endodóntico y aceptación del paciente. Abstract in english Purpose: Make a ceramic restoration (feldsphatic and zirconium dioxide) in young molars with endodontic treatment, to prevent further complications in the stomatognathic apparatus for the loss of these teeth. Material and methods: It describes the making of ceramic restorations in the right mandibul [...] ar molar area to a female patient of 18 years old, to whom it was made a periapical radiography, for presenting spontaneous pain on the mandibular right side. It was diagnosed as an irreversible pulpitis at the first and second molar, that were treated endodontically. The ceramic restorations of both molars were made with the Cerec CAD/CAM system and were examined after 6 and 12 months in accordance with the US Public Health Service (USPHS) criteria at baseline. Results: The clinical evaluation showed that the structures of feldspathic ceramic and zirconium dioxide in the offer period evaluated presented, proper anatomical shape, marginal adaptation, color stability, absence of recurrence cavities in the posterior teeth with endodontic treatment and acceptance of the patient.

M., Urdaneta Quintero; L., Yánez de Meléndez; J., Álvarez Zárraga; M., Jimeno Jiménez; C., Soto Mestre.

2009-12-01

114

Radiologic study of mandibular third molar of Korean youths  

International Nuclear Information System (INIS)

The author has made a study on the classification of the mandibular 3rd molars of Korean youths through dental radiography by means of Pell and Gregory's classification and on the prevalence of the dental caries of distal surface of the mandibular 2nd molar adjacent to the mandibular 3rd molars turned anteriorly. The results are as follow; 1. It was found that the largest case number was class I (272 cases, 52.9%) in the relation of the tooth to the ramus of the mandible and 2nd molar. 2. The mesio-angular position was the largest number (239 cases, 46.5%) in the relation of the long axis of the impacted mandibular 3rd molar to the long axis of the 2nd molar. 3. The mesio-angular position of class I was the largest number (140 cases, 27.2%) in the relation of the tooth to the ramus of the mandible and 2nd molar and the long axis of the impacted mandibular 3rd moral to the long axis of the 2nd molar. 4. The average angle of the long axis of mandibular 3rd molar in mesioangular position or horizontal position to the occlusal plane was 143 W 5. Mandibular 3rd molar with lesion such as dental cries or pericoronitis was 73 cases (14.2). 6. The caries incidence rate of the distal surface of the 2nd molar was about 3.1%.

115

Radiologic study of mandibular third molar of Korean youths  

Energy Technology Data Exchange (ETDEWEB)

The author has made a study on the classification of the mandibular 3rd molars of Korean youths through dental radiography by means of Pell and Gregory's classification and on the prevalence of the dental caries of distal surface of the mandibular 2nd molar adjacent to the mandibular 3rd molars turned anteriorly. The results are as follow; 1. It was found that the largest case number was class I (272 cases, 52.9%) in the relation of the tooth to the ramus of the mandible and 2nd molar. 2. The mesio-angular position was the largest number (239 cases, 46.5%) in the relation of the long axis of the impacted mandibular 3rd molar to the long axis of the 2nd molar. 3. The mesio-angular position of class I was the largest number (140 cases, 27.2%) in the relation of the tooth to the ramus of the mandible and 2nd molar and the long axis of the impacted mandibular 3rd moral to the long axis of the 2nd molar. 4. The average angle of the long axis of mandibular 3rd molar in mesioangular position or horizontal position to the occlusal plane was 143 W 5. Mandibular 3rd molar with lesion such as dental cries or pericoronitis was 73 cases (14.2). 6. The caries incidence rate of the distal surface of the 2nd molar was about 3.1%.

Ahn, Hyung Kyu [Dept. of Oral Radiology, College of Dentistry, Seoul National University, Seoul (Korea, Republic of)

1982-11-15

116

An incidental finding of the accessory inferior thyroid artery  

OpenAIRE

We report a case of an incidental finding of the right accessory inferior thyroid artery, emerging from the thyrocervical trunk together with a typical inferior thyroid artery, present in a normal position. On the left side, only single inferior thyroid artery was present. Only one inferior thyroid vein was found on each side. The accessory inferior thyroid artery entered the thyroid gland approximately 1 cm above the normal inferior thyroid, above the superior parathyroid gland. Although acc...

Sedy J

2008-01-01

117

Bilateral lower second molar impaction in teenagers: An emergent problem?  

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Full Text Available The frequency of simultaneously impacted second and third molars in teenagers is increasing and becoming a common occurrence in adolescent oral surgery practice. The traditional treatment is the removal of the third molar by conventional access but repositioning of the surgical flap to the distal face of the first molar can predispose to complications such as pericoronitis and delayed healing of the attached gingiva. We present a case in which we use the germectomy approach to remove the impacted third molar for the eruption of the second molar through a vestibular incision. This incision offers excellent bone exposure and exit route for the third molar without disturbing the gingiva attached architecture on the distal face of the first molar providing good healing environment.

Shinohara Elio

2010-01-01

118

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available ... L. SMITH, MD, FACS: Yes, well, that's the fascia. And that's actually one of the strength layers of the abdomen. And one of the big differences between the deep inferior epigastric perforator flap and the older TRAM ...

119

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available ... it depends on the amount of tension that's present at closure. The more tension, the more we ... a second pair of vessels that are sometimes present. Those are called the superficial inferior epigastric vessels. ...

120

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available BREAST RECONSTRUCTION: DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00: ... Over the next hour, live from Beth Israel Medical Center in New York City, you'll hear ...

121

Inferior Vena Cava Filter Placement and Removal  

Science.gov (United States)

... Video Clip (00:04:58) Your Radiologist Explains IVC Filter Placement and Removal What is Inferior Vena Cava ... the clot can travel to the lungs. An IVC filter traps large clot fragments and prevents them from ...

122

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available ... which is the deep inferior epigastric artery and vein, comes up from underneath the muscle and perforates ... if present, may be very small. So the veins are usually present. And here we've seen ...

123

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available BREAST RECONSTRUCTION: DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00:00:24 WOMAN 1: The diagnosis of breast cancer is shocking for anybody and everybody. It's ...

124

Portal Decompression Using the Inferior Mesenteric Vein  

OpenAIRE

We report five patients with variceal hemorrhage, in three cases secondary to diffuse thrombosis of the portal, superior mesenteric and splenic veins. Mesenteric angiography demonstrated patency of the inferior mesenteric vein (IMV) in each, and successful portal decompression by anastomosis of the IMV to the left renal vein (n=4) or the inferior vena cava (n=1) was accomplished. Bleeding was permanently controlled: four patients have survived from one to eight years post-operatively. Because...

Gorini, Paolo; Johansen, Kaj

1998-01-01

125

A novel technique for inferior rectus recession  

OpenAIRE

Birsen Gokyigit, Serpil Akar, Omer Faruk YilmazDepartment of Strabismus, Istanbul Beyoglu Educational and Research Eye Hospital, Istanbul, TurkeyPurpose: To introduce a novel technique of inferior rectus recession operation to allow larger amounts of recession without causing lower lid retraction and to compare this method with the results obtained in standard inferior rectus recession.Material and methods: This study included 20 patients operated on in the authors' clinic. The median age...

Gokyigit B; Akar S; Of, Yilmaz

2014-01-01

126

[Traumatic thrombosis of the inferior vena cava].  

Science.gov (United States)

Traumatic thrombosis of vena cava is rare. Thrombosis of the inferior vena cava diagnosed by uroscanner after blunt abdominal trauma involving the kidney is reported. The Doppler exam confirmed the floating character of the clot. Three days after the initiation of anticoagulant therapy, the thrombus disappeared without any clinical or radiological signs of pulmonary embolism. Fifteen cases of traumatic thrombosis of the inferior vena cava have been described in the literature. Mechanisms, clinical pictures and the management are discussed. PMID:15324965

Mouaffak, Y; Mikou, M M; Benyacob, A; Mosaddek, A; Faroudy, M; Ababou, A; Lazreq, C; Sbihi, A

2004-07-01

127

Disposición del conducto dentario inferior en el cuerpo mandibular: Estudio anatómico y tomográfico  

Scientific Electronic Library Online (English)

Full Text Available RESUMEN El objetivo del presente estudio fue determinar la distancia entre el conducto dentario inferior (CDI) y las tablas óseas lingual (TL), vestibular (TV) y basal (RB) en cuatro sectores del cuerpo mandibular. Se utilizaron diez mandíbulas que presentaban la región premolar y molar edéntula. Se [...] evaluaron mediante tomografía espiral convencional (Cranex TOME multifuctional unit, Soredex, Finlandia) y examen visual directo, posterior a la osteotomía. Se realizaron mediciones desde el CDI hasta TL, TV y RB; a nivel del segundo premolar, primer molar, segunda molar y tercer molar. Los resultados obtenidos se evaluaron estadísticamente con las pruebas Kolmogorov-Smirnov, ANOVA y test de Levene; las cuales demostraron homogeneidad y distribución normal entre las medidas de los especímenes y las tomografías (p>0.05). Al analizar las medidas mediante ANOVA y Kruskal-Wallis se encontró que el diámetro del CDI y la distancia hacia la TL eran constantes en los cuatro sectores del cuerpo mandibular (p>0.05). El diámetro del CDI presentó un rango de 2.3mm a 2.6mm y la distancia a TL de 2.5mm a 2.8mm. Las distancias a RB y TV presentaban diferencias estadísticamente significativas (p Abstract in english Abstract The aim of the current study was determine the distance between mandibular canal (CDI) and lingual (TL), labial (V) and basal cortical bone (RB) in four mandibular body areas. Ten mandibular bones showing premolar and molar edentulous region was used. They were assessed by Conventional Spir [...] al Tomography (Cranex TOME multifuctional unit, Soredex, Finland) and a direct visual exam following osteotomy. Measures were made from CDI to TL, TV and RB; at second premolar, first molar, second molar and third molar level. Gotten results were assessed by ANOVA, Kolmogorov-Smirnov and Levene tests that showed homogeneity among specimens measures and Tomographies (p>0.05). ANOVA and Kruskal-Wallis were used to refer measures where CDI diameter and the distance to TL were constant in the four mandibular body areas (p>0.05). CDI diameter showed a rank from 2.3mm to 2.6mm and a distance of 2.5mm a 2.8mm to TL. The distances to RB and TV showed statistically significant differences (p

Jorge A, Beltrán Silva; Lillie E, Abanto Silva; Abraham, Meneses López.

2007-09-01

128

Inferior vena cava hypoplasia with right hepatic vein and accessory inferior hepatic vein shunt.  

Science.gov (United States)

Inferior vena cava (IVC) hypoplasia is a rare condition. Venous blood flow is usually provided through collaterals in the azygos or hemiazygos venous systems. However, portosystemic shunts with intrahepatic venous collateral are extremely rare. The case is presented here of a large shunt between the right hepatic vein, accessory inferior hepatic vein, and inferior vena cava in a 37-year-old female patient with IVC hypoplasia. PMID:24590531

Cullu, N; Yeniçeri, O; Deveer, M; Tetiker, H

2014-02-01

129

Electro-acupuncture efficacy on pain control after mandibular third molar surgery  

Scientific Electronic Library Online (English)

Full Text Available O objetivo desta pesquisa foi verificar a eficácia da aplicação de eletro-acupuntura (EAC) na redução da dor após a exodontia de terceiros molares inferiores inclusos. Foram selecionados 24 pacientes jovens (12 homens e 12 mulheres) com inclusão bilateral de terceiros molares inferiores em posição s [...] imilar. Cada paciente foi submetido aleatoriamente a dois procedimentos cirúrgicos em dias diferentes: em um deles o dente foi extraído com uma sessão pré-operatória (24 h) e uma pós-operatória imediata de EAC enquanto no outro a extração foi feita sem EAC. A EAC foi aplicada em 6 pontos sistêmicos bilaterais e 2 auriculares com um aparelho WQ10D1 utilizando freqüência de 40-60 Hz por 20 min com intensidade ajustada individualmente. A dor foi avaliada desde 2h até 72h pós-operatórias utilizando a escala visual análoga (EVA) de 100 mm e pelo consumo de analgésicos. Os dados foram comparados pelo teste deWilcoxon. Os escores de dor da EVA foram significantemente menores para o tratamento com EAC (p Abstract in english The aim of this study was to evaluate the efficacy of electro-acupuncture (EAC) on postoperative pain control after mandibular third molar surgery. Twenty four young patients (12 male and 12 female) with symmetrically impacted mandibular third molars were selected. Each patient was submitted to two [...] separate surgical procedures under local anesthesia. At one side, extraction was carried out employing both prior (24h) and immediately postoperative application of EAC, while on the contralateral side surgery was carried out without any treatment. EAC was applied on 6 bilateral systemic and 2 auricular points with a WQ10Dl appliance using 40-60Hz frequency for 20 min and individually adjusted intensity. Postoperative pain intensity was rated on a 100 mm visual analog scale (VAS) between 2 and 72 h and recording the amount of analgesics intake after surgery. Statistical analysis was performed using theWilcoxon test. Postoperative pain VAS scores were significantly lower for the EAC group (p

Marconi Gonzaga, Tavares; Ana Paula, Machado; Breno Gutierrez, Motta; Maria Cristina, Borsatto; Adalberto Luiz, Rosa; Samuel Porfírio, Xavier.

130

Influence of deciduous molar hypomineralization on the development of molar-incisor hypomineralizarion  

Scientific Electronic Library Online (English)

Full Text Available Defects similar to Molar-Incisor Hypomineralization (MIH) in second primary molars can be found in the literature, being recently named Deciduous Molar Hypomineralization (DMH). Researchers have stated that the presence of DMH in primary dentition represents a risk for MIH in permanent teeth. The ex [...] planation for this association is probably related to the etiological factors. AIM: To investigate prospectively the association between DMH and MIH and the etiologic factors involved in both defects. METHODS: One hundred and thirty four children aged 4 to 6 years from Botelhos, MG, Brazil, were evaluated six-monthly until they completed the eruption of the first permanent molars. A structured questionnaire was developed with questions about the child's health up to the first year of life and the mother's health during pregnancy. RESULTS: It could be noted that, although most children with DMH in the primary dentition had higher incidence of MIH in permanent dentition, this difference was not statistically significant. CONCLUSIONS: None of the possible etiologic factors had associations with the studied enamel defects, even among children who presented two types of enamel defects in the mixed dentition. However, further studies with larger samples should be conducted in order to confirm or refute the findings of the present study.

Cristiane Maria, Costa-Silva; Janice Simpson de, Paula; Glaucia Maria Bovi, Ambrosano; Fábio Luiz, Mialhe.

2013-12-01

131

Association between clinical parameters and the presence of active caries lesions in first permanent molars Associação entre parâmetros clínicos e a presença de lesões ativas de cárie em primeiros molares permanentes  

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Full Text Available The aim of the present study was to evaluate the association between clinical parameters and the presence of active caries lesions on the occlusal surface of first permanent molars. Forty eight children (5.8-13.8 years-old with at least one first permanent molar present were selected. The clinical parameters evaluated were gender, age, DMF-T and dmf-t, presence of active white spots in other teeth, general plaque index, tooth's dental arch (upper or lower, tooth's side (right or left, presence of visible plaque and eruption degree of the first permanent molars. The first permanent molars were evaluated through visual inspection by two examiners in order to assess the presence of active or inactive caries lesions on the occlusal surface. Univariate and multivariate analyses for determination of the association between clinical parameters and the presence of active caries lesions in these teeth were performed. The presence of active white spots in other teeth was associated with the presence of active caries lesions in the first permanent molars, in both univariate and multivariate analyses (Odds ratio = 8.8 and 1.9, respectively. The presence of abundant visible plaque on the occlusal surface of the first permanent molars (Odds ratio = 3.5 in the univariate analysis, and 3.9 in the multivariate one also presented a significant association. In conclusion, the presence of active white spots in other teeth and the presence of considerable visible plaque were associated with the presence of active caries lesions on the occlusal surfaces of first permanent molars.O objetivo do presente trabalho foi avaliar a associação entre parâmetros clínicos e presença de lesões ativas de cárie sobre a superfície oclusal de primeiros molares permanentes. Quarenta e oito crianças (5,8-13,8 anos com pelo menos um primeiro molar permanente foram selecionadas. Os parâmetros clínicos avaliados foram sexo, idade, CPO-D e ceo-d, presença de manchas brancas ativas em outros dentes, índice de placa, arco dentário do dente (superior ou inferior, lado do dente (direito ou esquerdo, presença de placa visível e grau de erupção dos primeiros molares permanentes. Os primeiros molares permanentes foram avaliados usando inspeção visual por dois examinadores para avaliar a presença de lesões de cárie ativas ou inativas sobre a superfície oclusal. Análises univariada e multivariada para avaliação da associação dos parâmetros clínicos e presença de lesões ativas nesses dentes foram realizadas. A presença de manchas brancas ativas em outros dentes apresentou associação significante com a presença de lesões ativas de cárie nos primeiros molares permanentes, em ambas as análises univariada e multivariada ("Odds ratio" = 8,8 e 1,9, respectivamente. A presença de placa visível abundante sobre a superfície oclusal dos primeiros molares permanentes ("Odds ratio" = 3,5 na análise univariada, e 3,9 na análise multivariada também apresentou associação significante. Em conclusão, a presença de manchas brancas ativas em outros dentes e a presença de placa visível abundante apresentaram associação com a presença de lesões ativas de cárie sobre a superfície oclusal dos primeiros molares permanentes.

Juliana Maria Quaglio

2006-12-01

132

Litterfall, litter decomposition and nitrogen mineralization in old-growth evergreen and secondary deciduous Nothofagus forests in south-central Chile / Aporte, descomposición de hojarasca y mineralización de nitrógeno en bosques siempreverdes de antiguo crecimiento y bosques secundarios deciduos, centro-sur de Chile  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish Los ecosistemas forestales del sur de Chile presentan un gran valor ecológico pues constituyen una de las mayores áreas del hemisferio Sur con existencias de bosques templados lluviosos. Están sometidos a procesos de deforestación, invasión de especies exóticas, fragmentación e incremento de deposit [...] ación de nitrógeno (N) atmosférico. Para apoyar su manejo sustentable se requiere de mayor conocimiento en el ciclo de nutrientes de estos ecosistemas. Se estudia la dinámica de nutrientes en cuatro sitios de bosques lluviosos valdivianos de la precordillera de los Andes, centro-sur de Chile: un bosque siempreverde de antiguo crecimiento prístino y otro alterado, un bosque caducifolio secundario con manejo silvícola y otro sin. Durante el período octubre 2002 -septiembre 2006, se estimaron (i) masa de la hojarasca (cuatro años) y contenido de nutrientes de la hojarasca (un año), (ii) descomposición y dinámica de nutrientes de hojarasca (un año) y de la corteza de Saxegothaea conspicua, y (iii) mineralización neta de nitrógeno (N-min) en el suelo in situ (un año). El aporte de hojarasca en los cuatro sitios fluctúa desde 3.5 hasta 5.8 ton ha-1 año-1, y es temporalmente menor en bosque caducifolio manejado, respecto del caducifolio sin manejo. Además, presentan una estacionalidad en los siempreverdes que es diferente, respecto de los deciduos. La hojarasca se descompone más rápidamente (promedio 32 % pérdida de masa después de un año) que la corteza (8 %), pero no se presentaron diferencias significativas en la hojarasca. El N neto en la hojarasca de los bosques siempreverdes disminuye durante la descomposición, pero se incrementa en la hojarasca de los deciduos. La N-mineralización neta del suelo fue completa en el bosque siempreverde prístino, intermedia en los bosques deciduos y el más baja en el bosque siempreverde alterado. Dada la ausencia de réplicas en las parcelas, no puede ser demostrado el impacto definido del tipo de bosque o régimen de manejo en el ciclo interno de nutrientes. Sin embargo, los resultados sugieren que el manejo silvícola puede afectar el reciclaje de nutrientes por la alteración en la composición de especies y estructura del bosque, aun cuando en el bosque secundario deciduo una extracción selectiva de madera en tiempo reciente (cinco años), no afecta la descomposición de la hojarasca o los montos de mineralización del nitrógeno. Abstract in english South Chilean forest ecosystems represent one of the largest areas of old-growth temperate rainforests remaining in the Southern hemisphere and have a high ecological value, but suffer from deforestation, invasion by exotic species, fragmentation, and increasing atmospheric nitrogen (N) deposition. [...] To support sustainable forest management, more knowledge is required on nutrient cycling of these ecosystems. Therefore, a descriptive study of nutrient dynamics was done in four Valdivian rainforests in the lower Andes range of south Chile: old-growth and altered evergreen stands and unmanaged and managed secondary deciduous stands. Time series were measured for (i) mass (four year) and nutrient content (N, K, Ca, and Mg; one year) of litterfall, (ii) decomposition and nutrient dynamics (N, C, K, Ca, Mg, and P; one year) of leaf litter and Saxegothaea conspicua bark litter, and (iii) in situ topsoil net N mineralization (one year). Litterfall in the four stands ranged from 3.5 to 5.8 ton ha-1 yr-1, was temporarily lower in the managed than in the unmanaged deciduous stand and had a different seasonality in the evergreen stands than in the deciduous stands. Leaf litter decomposed faster (on average 32 % mass loss after one year) than bark litter (8 %) but without significant differences between leaf litter types. Net N in evergreen leaf litter decreased during decomposition but increased in deciduous leaf litter. Net soil N mineralization was fastest in the pristine evergreen stand, intermediate in the deciduous stands and slowest in

JEROEN, STAELENS; NELE, AMELOOT; LEONARDO, ALMONACID; EVELYN, PADILLA; PASCAL, BOECKX; DRIES, HUYGENS; KRIS, VERHEYEN; CARLOS, OYARZÚN; ROBERTO, GODOY.

2011-03-01

133

The extent of axonal exposure and axo-axonal apposition in the non-myelinated nerve fibres of peripheral nerve trunks and their dependence on buffer molarity.  

OpenAIRE

Nineteen rats were perfused intracardially with a 2% glutaraldehyde solution in cacodylate buffers adjusted in molarity from 0 to 0 . 4 m. Ultrathin sections of the inferior alveolar nerve were photographed in the electron microscopy. From prints of unmyelinated nerve fibres, the following measurements were made: axon circumference, the proportion of axons which were incompletely covered by the Schwann cell and the extent of this 'exposure', the proportion of axons which were apparently in co...

Holland, G. R.

1982-01-01

134

Remoción de terceros molares mandibulares con asistencia endoscópica: Nota técnica de un nuevo procedimiento quirúrgico para prevenir lesiones del NAI y formación de defectos óseos / Removal of mandibular third molars with endoscopic approach: Technical note of a new surgical procedure to avoid IAN damage and bone defect formation  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: Spanish Abstract in spanish La variada posición anatómica de los terceros molares mandibulares presenta importantes desafíos asociados a su profundidad y grado de inclinación. Las complicaciones más habituales del procedimiento quirúrgico convencional de extracción se relacionan con la extensa osteotomía y poca visualización d [...] el sitio quirúrgico, que pueden generar consecuencias post-quirúrgicas como inflamación, dolor, trismus, lesiones reversibles e irreversibles del nervio alveolar inferior (NAI) o nervio lingual, riesgo de fractura y formación de defectos periodontales del segundo molar. La implementación de soportes rígidos en la óptica endoscópica ha permitido utilizar esta tecnología para realizar abordajes mínimamente invasivos para remover terceros molares mediante accesos flapless con una mínima osteotomía de la zona oclusal, conservando la pared bucal y lingual a través de la visualización directa y magnificada del sitio quirúrgico, adaptable a los movimientos del paciente durante la intervención. En este reporte se presenta un nuevo procedimiento quirúrgico mínimamente invasivo a través de asistencia endoscópica para la conservación ósea en la remoción de terceros molares mandibulares con riesgo de lesión del nervio alveolar inferior. Abstract in english Anatomic variability of the position of mandibular third molars represents significant challenges associated with its depth and angulation. The most common complications of conventional surgical procedure are related to extensive osteotomy and poor visualization, which can cause postsurgical effects [...] such as inflammation, pain, trismus, reversible and irreversible lesions of the inferior alveolar nerve (IAN) or lingual nerve, fracture risk and formation of a deep periodontal defect on the distal aspect of the second molar. The implementation of rigid endoscopy in optics has allowed to use this technology via a minimally invasive approach to remove third molars by a minimally occlusal flapless ostectomy, preserving the buccal and lingual walls through direct and magnified visualization of the surgical site, adaptable to the patient’s movements during the surgery. In this report, we present a new and minimally invasive procedure through endoscopic assistance for bone conservation in the removal of third molars at risk of inferior alveolar nerve injury.

R, Fuentes; V, Beltrán; M, Cantín; W, Engelke.

2012-08-01

135

A simplified approach to true molar intrusion  

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Full Text Available Abstract Background Orthodontic management of anterior open bites is a demanding task for orthodontists. Molar intrusion as a primary means of open bite correction entails the need for appropriate anchorage. Orthodontic mini implants can provide the required mechanical support. The suggested procedure aims to reduce the risk of complications such as root damage or soft tissue irritations while minimizing overall complexity. Methods Three female patients aged 14, 18 and 19 years who decided against a surgical correction were treated with a device consisting of mini implants in the palatal slope, a palatal bar and intrusion cantilevers. Results In all three patients, an open bite reduction of more than a millimeter occurred within four months. An anterior overbite of 2 mm or more could be established within 6 to 9 months. Conclusions The method presented in this article enables the practitioner to use mini implants in an easily accessible insertion site. A lab-side procedure is optional but not required.

Flieger Stefanie

2012-11-01

136

Partial Invasive Molar Pregnancy –2 Case Reports  

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Full Text Available Gestational trophoblastic disease encompasses several entities like complete mole , partial mole , invasive mole , gestational trophoblastic carcinoma and trophoblastic carcinoma from implantation site . These entities are different from each other by their origins , morphology , their evolution and their treatment. Among all components partial mole is very common (90% and triploid genetically. This is one of the important causative factors of miscarriages. Very rarely (2-4% partial mole can develop into invasive one presenting with features of incomplete abortion , missed abortion and sometimes as obstetric emergencies like intra peritoneal hemorrhage and torrential vaginal bleeding .So proper diagnosis and timely intervention can prevent mortality and reduce morbidity of the patients. Here we report two such cases of partial invasive molar pregnancies with varied picture .

Debasmita Mandal

2010-01-01

137

Molar extinction coefficients of some fatty acids  

International Nuclear Information System (INIS)

The attenuation of gamma rays in some fatty acids, viz. formic acid (CH2O2), acetic acid (C2H4O2), propionic acid (C3H6O2), butyric acid (C4H8O2), n-hexanoic acid (C6H12O2), n-caprylic acid (C8H16O2), lauric acid (C12H24O2), myristic acid (C14H28O2), palmitic acid (C16H32O2), oleic acid (C18H34O2) and stearic acid (C18H36O2), has been measured at the photon energies 81, 356, 511, 662, 1173 and 1332 keV. Experimental values for the molar extinction coefficient, the effective atomic number and the electron density have been derived and compared with theoretical calculations. There is good agreement between experiment and theory

138

Molar extinction coefficients of some fatty acids  

Science.gov (United States)

The attenuation of gamma rays in some fatty acids, viz. formic acid (CH 2O 2), acetic acid (C 2H 4O 2), propionic acid (C 3H 6O 2), butyric acid (C 4H 8O 2), n-hexanoic acid (C 6H 12O 2), n-caprylic acid (C 8H 16O 2), lauric acid (C 12H 24O 2), myristic acid (C 14H 28O 2), palmitic acid (C 16H 32O 2), oleic acid (C 18H 34O 2) and stearic acid (C 18H 36O 2), has been measured at the photon energies 81, 356, 511, 662, 1173 and 1332 keV. Experimental values for the molar extinction coefficient, the effective atomic number and the electron density have been derived and compared with theoretical calculations. There is good agreement between experiment and theory.

Sandhu, G. K.; Singh, Kulwant; Lark, B. S.; Gerward, L.

2002-10-01

139

Molar extinction coefficients of some fatty acids  

DEFF Research Database (Denmark)

The attenuation of gamma rays in some fatty acids, viz. formic acid (CH2O2), acetic acid (C2H4O2), propionic acid (C3H6O2), butyric acid (C4H8O2), n-hexanoic acid (C6H12O2), n-caprylic acid (C8H16O2), lauric acid (C12H24O2), myristic acid (C14H28O2), palmitic acid (C16H32O2), oleic acid (C18H34O2) and stearic acid (C18H36O2), has been measured at the photon energies 81, 356, 511, 662, 1173 and 1332 keV. Experimental values for the molar extinction coefficient, the effective atomic number and the electron density have been derived and compared with theoretical calculations. There is good agreement between experiment and theory.

Sandhu, G.K.; Singh, K.

2002-01-01

140

The unerupted maxillary second molar, due to an overlying and malformed upper third molar: treatment and follow-up.  

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This retrospective study presents the treatment and follow-up of 20 young patients with 23 impacted upper second molars, due to overlying, impacted upper third molars. The third molars were removed surgically under local anaesthesia. After removal of these palatally obstructing teeth, radiographic and clinical follow-up was performed. The purpose of this study was to evaluate the eruption progress of the upper second molars after surgery. Radiological and/or clinical follow-up showed complete eruption of 19 (83%) of the upper second molars. For those cases treated before the age of 12 years and 4 months (the mean eruption age), all the upper second molars erupted completely. For those cases where surgical removal was undertaken after the mean eruption age, four (17%) of the upper second molars did not completely erupt. It was concluded that early treatment of impacted upper second molars, due to overlying third molars, may lead to more rapid eruption. Further prospective research is necessary to develop guidelines for the removal of palatally obstructing third molars to avoid eruption problems. PMID:18287391

Salentijn, E G; Ras, F; Mensink, G; van Merkesteyn, J P R

2008-03-01

141

Sagittal osteotomy for the removal of deeply impacted mandibular molars: a presentation of series of cases.  

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Sagittal osteotomy was primarily described as a treatment for prognathism and retrognathia. It has been rarely reported as an option for the removal of deeply impacted tooth. The principal indication of this approach is when the tooth is deeply impacted on the mandibular ramus or body and it presents intimate relationship between its root and inferior alveolar neurovascular bundles. In this article the author related three rare cases of lower third molar included. Because of the unusual deeply position of these, the SRRO surgery technique was realized to remove them. Sagittal split ramus osteotomy (SSRO) is technically safe and allows the removal of teeth in situations of deeply impacted mandibular ramus, angle or body with minimal trauma in a short time. PMID:25838706

Santos, Saulo Ellery; Tavares, Rodrygo Nunes; de Moraes, Márcio; Freire-Filho, Francisco Wagner Vasconcelos

2015-03-01

142

Relationship between hypoesthesia of the lower lip after extraction of the mandibular third molar and preoperative imaging findings on panoramic X-ray films and multi-planer reconstructive CT scans  

International Nuclear Information System (INIS)

The mandibular third molars are usually located near the inferior alveolar nerve. Surgical removal of these molars may damage the nerve and cause hypoesthesia of the lower lip. Before surgery, it is important to examine the exact positional relationship between the mandibular third molars and the mandibular canal to prevent such complications. A total of 329 lower third molars from 198 patients were studied on panoramic radiographs and computed tomography (CT). We studied the association of hypoesthesia with the spacial relation between the tooth roots and the mandibular canal. Hypoesthesia occurred in 23 of 329 teeth (7.0%). Almost all cases of hypoesthesia resolved within 6 months. However, hypoesthesia of 3 teeth (0.9%) persisted approximately 7 to 12 months after surgery. In 206 of 329 teeth (62.6%), the assumed location of the mandibular canal differed between panoramic radiography and CT. Furthermore, the prediction rate of the incidence of type 1 hypoesthesia on CT (35.5%) was higher than that on panoramic radiography (15.9%). Risk factors related to hypoesthesia included loss of the white line of the root, curve of the mandibular canal, and close proximity of the tooth to the mandibular canal (Type 1) on panoramic radiography. There were also teeth in contact with the canal (0 mm) in all patients in whom hypoesthesia developed. In particular, patients whose mandibular canals were located between the roots of the mandibular third molar or on the lingual side ofular third molar or on the lingual side of the mandibular third molar had a high incidence of hypoesthesia (26.0%). These results suggest that the positional relation between the mandibular third molars and the mandibular canal should be accurately evaluated by CT. Because of its high resolution and ability to examine patients in detail, CT was found to be useful for predicting the risk of inferior alveolar nerve damage before mandibular third molar surgery. (author)

143

Caracterización de la formación y el desarrollo de los terceros molares / Characterization of the formation and development of the third molars  

Scientific Electronic Library Online (English)

Full Text Available Se realizó un estudio observacional, descriptivo y transversal en el Departamento de Ortodoncia de la Clínica Estomatológica Provincial Docente "Mártires del Moncada" de Santiago de Cuba, con vistas a caracterizar la formación y desarrollo de los terceros molares según edad, localización, sexo y gru [...] po étnico, en el período de mayo de 2010 a igual mes de 2011. La información necesaria se obtuvo de las historias clínicas y radiografías panorámicas de los pacientes ingresados en dicho Departamento. En la casuística, la edad promedio de aparición de la cripta fue a los 8,7 años y de los movimientos eruptivos a los 11-12,2 años; asimismo se concluyó que la arcada inferior, el sexo masculino y la raza negra se adelantaron en alcanzar las diferentes etapas de formación y desarrollo de los cordales. Se recomendó llevar a cabo otra investigación al respecto, pero con un número mayor de pacientes y en edades más tempranas, así como proponer un esquema de formación y desarrollo para el tercer molar en el territorio Abstract in english An observational, descriptive and cross-sectional study was carried out in the Department of Orthodontics of "Martires del Moncada" Provincial School of Dentistry in Santiago de Cuba, with the purpose of characterizing the formation and development of the third molars according to age, location, gen [...] der and ethnicity, in the period of May 2010 to the same month of 2011. The necessary information was obtained from medical records and panoramic x-rays of patients admitted to this department. In the case series the average age of the crypt onset was 8.7 years and the eruptive movements from 11 to 12.2 years; it was also concluded that the lower arch, male sex and black race were advanced to reach the different stages of formation and development of wisdom teeth. It was recommended to carry out another study on this, but with a greater number of patients and at younger ages, and to propose a scheme of the third molar formation and development in the territory

Liuba, González Espangler; Paula, Mok Barceló; Alexis, de la Tejera Chillón; Yaimel, George Valles; Marvis Lisy, Leyva Lara.

2014-01-01

144

Impaction of permanent mandibular second molar: A retrospective study  

OpenAIRE

Objective: To determine the prevalence of impacted mandibular second molar (MM2) and the association between MM2 impaction and crowding. The clinical significance of the angle between first and second mandibular molar and of the space between the first mandibular molar (MM1) and the anterior margin of mandibular ramus in MM2 impaction were also evaluated. Material and Methods: In this retrospective study , from the dental records of 2,945 caucasian young orthodontics patients, 40 subjects ...

Cassetta, Michele; Altieri, Federica; Di Mambro, Alfonso; Galluccio, Gabriella; Barbato, Ersilia

2013-01-01

145

Late Mandibular Angle Fracture After Impacted Third Molar Extraction: Case Report and Review of Predisposing Factors / Fractura Tardía de Ángulo de Mandibula Post Extracción de Tercer Molar Impactado: Reporte de un Caso y Revisión de Factores Predisponentes  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish Cirugía del tercer molar es el procedimiento quirúrgico más común en la cavidad oral. Cuando se indica la extracción, una cuidadosa planificación basada en los exámenes clínicos y radiográficos es esencial para evitar complicaciones postoperatorias como sangrado, alveolitis, infecciones, lesiones a [...] los dientes adyacentes, comunicaciones oroantrales o incluso fracturas mandibulares. Aunque es raro, el riesgo de fracturas mandibulares postoperatorias después de la cirugía del tercer molar impactado se relaciona con algunos factores. Reportamos el caso de un paciente de 50 años de edad con queja de dolor en la región del ángulo mandibular izquierdo, quien y declaró que tres semanas antes se había extraído el tercer molar inferior izquierdo. Por tomografía computarizada se confirmó la presencia de una fractura en el ángulo mandibular. Este informe contribuye a mostrar los factores que predisponen para provocar esta lesión después de una revisión de la literatura, que muestran que el clínico los debería tener como consideración cuando indican la extracción de los terceros molares. Para evitar esta complicación, factores como el grado de impactación ósea, profundidad del diente en el hueso, proximidad al canal mandibular, posición en relación a dientes adyacentes, presencia de dilaceraciones radiculares, entre otras, deben ser tomadas en cuenta. Se presenta un caso de fractura mandibular tardía que ocurrió 21 días después de la extracción del tercer molar. Se realizó un tratamiento conservador y después de seis meses de seguimiento radiográfico y clínico, el paciente conservó completamente la función mandibular, con una oclusión normal y sin molestias. Abstract in english Third molar surgery is the most common surgical procedure in the oral cavity. Whenever extraction is indicated, careful planning based on clinical and radiographic examinations is essential to guard against postoperative complications like: bleeding, alveolitis, infections, injury to adjacent teeth, [...] oroantral communications, or even mandibular fractures. Although rare, the risk of postoperative mandibular fractures after third molar impaction surgery is related to some factors. Our case report a 50-year-old white female patient with a complaint of pain in the region of the left mandibular angle and stated that three weeks before she had the left mandibular third molar extracted, which computerized tomographic confirmed the presence of a fracture in the mandibular angle. However, our report contributes to showing the predisposing factors to cause this injury after a review of the literature, showing the clinician what they should take like consideration when they indicate the extraction of third molars. To avoid this complication, factors like bony impaction, depth of tooth within bone, proximity to the inferior dental canal, tooth position in relation to adjacent teeth, the presence of root dilacerations and others must be taken into account. A case of late mandibular fracture that occurred 21 days after third molar extraction is reported. Conservative treatment was adopted and after six-months of radiographic and clinical follow-up, the patient had fully preserved mandibular function, normal occlusion and no discomfort.

Valdir Cabral, Andrade; Patrício José de Oliveira, Neto; Márcio, de Moraes; Luciana, Asprino.

2013-08-01

146

Response of molars and non-molars to a strict supragingival control in periodontal patients  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english The posterior position in the arches is one of the factors that underlies the poor prognosis of molar teeth (M). It is speculated that M do not benefit from the oral hygiene routine as well as non-molars (NM) do. This study evaluated the response of M and NM to supragingival control during a 6-month [...] period in 25 smokers (S) and 25 never-smokers (NS) with moderate-to-severe periodontitis. One calibrated examiner assessed visible plaque (VPI) and gingival bleeding (GBI) indexes, periodontal probing depth (PPD), bleeding on probing (BOP), and clinical attachment loss (CAL) at days 0 (baseline), 30 and 180. At baseline, M showed significantly higher mean values of VPI (p = 0.017) and PPD (p

Patrícia Daniela Melchiors, Angst; Flávia Benetti, Piccinin; Rui Vicente, Oppermann; Rosemary Adriana Chiérici, Marcantonio; Sabrina Carvalho, Gomes.

2013-02-01

147

Excess molar volumes, excess molar enthalpies, and excess isentropic compressibilities of tetrahydropyran with aromatic hydrocarbons  

International Nuclear Information System (INIS)

Excess molar volumes VE, excess molar enthalpies HE, and speeds of sound u, data of {tetrahydropyran (i) + benzene, or toluene, or o-, or p-, or m-xylene (j)} binary mixtures have been measured as a function of composition at a temperature of 308.15 K. Speeds of sound data have been utilized to predict excess isentropic compressibilities, ?SE. VE, HE, and ?SE data for the investigated mixtures have been analyzed in terms of the Graph theory which in turn deals with topology of the constituents of mixtures. An analysis of VE data in terms of Graph theory suggests that these mixtures are characterized by interactions between dipole of tetrahydropyran and ?-electron cloud of aromatic ring of aromatic hydrocarbons to form 1:1 molecular complex. It has been observed that VE, HE, and ?SE values predicted by the Graph theory compare well with their corresponding experimental values.

148

Profile changes in premolar extraction / Alterações no perfil em extrações de pré-molares  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese OBJETIVO: Este estudo retrospectivo avaliou pacientes tratados com exodontias de pré-molares através da análise de telerradiografias, comparando o efeito de diferentes protocolos de exodontias no perfil. METODOLOGIA: 87 pacientes foram selecionados da clínica particular de três ortodontistas diploma [...] dos pelo Board Brasileiro de Ortodontia e Ortopedia Facial. Estes pacientes foram tratados com aparelho fixo Edgewise e foram divididos em três grupos, de acordo com a sequência de pré-molares extraídos: "Grupo 40", primeiros pré-molares superiores (22 pacientes); "Grupo 44", quatro primeiros pré-molares (43 pacientes); e "Grupo 45", primeiros pré-molares superiores e segundos inferiores (22 pacientes). O Ângulo Z e a Linha de Burstone foram utilizados para quantificar e comparar os perfis antes e após o tratamento. RESULTADOS: O teste t-student mostrou melhora no perfil em todos os grupos, visto que o valor do ângulo Z apresentou-se maior ao final do tratamento e as medidas dos lábios vieram ao encontro dos valores preconizados por Burstone. A análise das mudanças proporcionadas pelo tratamento pela ANOVA não revelou diferenças significativas entre os grupos CONCLUSÃO: Os protocolos produzem aparências faciais semelhantes ao final do tratamento. Abstract in english PURPOSE: This retrospective study assessed patients treated with extraction of premolars by analysis of lateral cephalograms, comparing the effect of different tooth extraction protocols on the profile. METHODS: Eighty-seven patients were selected from the private practices of three orthodontists ce [...] rtified by the Brazilian Board of Orthodontics and Facial Orthopedics. These patients were treated with fixed edgewise appliances and divided into three groups according to the sequence in which premolars were extracted: "Group 40", maxillary first premolars (22 patients); "Group 44", both maxillary and mandibular first premolars (43 patients); and "Group 45", maxillary first and mandibular second premolars (22 patients). The Z angle and the Burstone line were used to quantify and compare the profiles before and after treatment. RESULTS: Student's t-test showed profile improvement in all groups, as the Z angle value was higher at treatment completion and the lip measurements were in agreement with the values recommended by Burstone. Analysis of treatment changes by the ANOVA did not reveal significant differences between groups. CONCLUSION: The protocols produced similar facial appearance at treatment completion.

Susiane, Allgayer; Eduardo M. Santayana de, Lima; Susana Deon, Rizzatto; Carlos Alberto Estevanell, Tavares; Luciane Macedo de, Menezes; Mauricio Barbieri, Mezzomo.

149

First permanent maxillary molar morphology and ideal occlusion.  

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Full Text Available AIM. To assess if variations in the anatomy of the upper first permanent molar might prevent the establishment of an ideal molar occlusion after orthodontic treatment. DESIGN. Measurements on dental casts selected at random from initial orthodontic records. MATERIALS AND METHODS. Forty maxillary dental casts were selected using criteria that assured the anatomical integrity of the upper right first permanent molar. The casts were scanned and the position of the molar cusps was measured using computer software. MAIN OUTCOME MEASURES. a. Buccal width (BW: the width between the buccal cusps. b. Cusp angle (CA: the angle between the lines joining the buccal and palatal cusps. c. Dist: the distance of the mesiobuccal cusp from a line perpendicular to the line joining the palatal cusps and passing through the mesiopalatal cusp. RESULTS. BW: mean 4.88 mm (SD: 0.41 mm, range: 4.2 – 6.0 mm. CA: mean -2.43 degrees (SD: 6.01, range -12.7 – 13.8 degrees. Dist: mean 2.15 mm (SD: 0.69 mm, range 1.0 – 3.8 mm. A large variability was noted. The morphology of 20% of the molars was such, that, if the mesiopalatal cusp were properly positioned in the central groove of the lower molar, the mesiobuccal cusp would be more than one-fifth cusp mesial or distal to the mesiobuccal groove of the lower molar. CONCLUSIONS. In some cases, the anatomy of the upper molar may not allow an ideal molar occlusion, and compromises in molar positioning may be required. The results of this study are based on the assumption of an average lower molar morphology and cuspal relationship.

D. I. Halazonetis

2000-01-01

150

EMBARAZO ECTÓPICO MOLAR CORNUAL: CASO CLÍNICO  

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Full Text Available Antecedentes: La incidencia de embarazo ectópico es 20/1000 embarazos y en la región cornual se presentan en el 2-4%. La mola hidatiforme ocurre en 1/1000 embarazos en EEUU y 1/500 en México. La presentación simultánea es muy rara. Se han descrito solamente 40 casos en la literatura médica, con una incidencia estimada de 0,04% de localización cornual. Caso clínico: Primigesta de 30 años, que cursando un embarazo de 8 semanas, acude de urgencia por presentar náuseas y vómitos de 1 día de evolución, con dolor abdominal y sangrado vaginal. Prueba de embarazo positiva. A la exploración física presenta dolor abdominal difuso y signos de irritación peritoneal. El ultrasonido transvaginal mostró imagen ecogénica multiquística intrauterina cercana a la región cornual, por lo que se sospecha embarazo molar. En la laparotomía exploradora se realizó resección cornual y posteriormente dilatación y curetaje de la cavidad uterina. La anatomía patológica confrmó el diagnóstico. Negativizó ß-hGC a las 7 semanas después de la cirugía.Background: The incidence of ectopic pregnancy is 20 per 1,000 pregnancies. The cornual ectopic pregnancy is found in 2-4%. Hydatidiform moles occur in 1 per 1000 pregnancies in USA and 1 per 500 in Mexico. Thus, the incidence of the two occurring together is very rare. Only 40 cases have been reported in the medical literature, the incidence estimate is 0.04%. Clinic case: We analyzed a 30 year old woman patient case, gravida 1, with 8 weeks’ gestation by last menstrual period, came at the Hospital Universitario “Dr. José Eleuterio González”, Monterrey, Nuevo León, with complaints of nausea and vomiting for 1 day and abdominal pain, and transvaginal bleeding. A cualitative pregnancy test was positive. Physical examination revealed diffuse abdominal tenderness and peritoneal signs. The transvaginal ultrasonography showed a multicystic echogenic mass within the uterus near cornual region consistent with a molar pregnancy. A cornual resection was performed followed by dilation and curettage. Pathologic diagnosis was confrmed. The monitoring of ß-hGC titers was negative 7 weeks after surgery.

Clara del Carmen Flores Acosta

2010-01-01

151

EMBARAZO ECTÓPICO MOLAR CORNUAL: CASO CLÍNICO  

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Full Text Available SciELO Chile | Language: Spanish Abstract in spanish Antecedentes: La incidencia de embarazo ectópico es 20/1000 embarazos y en la región cornual se presentan en el 2-4%. La mola hidatiforme ocurre en 1/1000 embarazos en EEUU y 1/500 en México. La presentación simultánea es muy rara. Se han descrito solamente 40 casos en la literatura médica, con una [...] incidencia estimada de 0,04% de localización cornual. Caso clínico: Primigesta de 30 años, que cursando un embarazo de 8 semanas, acude de urgencia por presentar náuseas y vómitos de 1 día de evolución, con dolor abdominal y sangrado vaginal. Prueba de embarazo positiva. A la exploración física presenta dolor abdominal difuso y signos de irritación peritoneal. El ultrasonido transvaginal mostró imagen ecogénica multiquística intrauterina cercana a la región cornual, por lo que se sospecha embarazo molar. En la laparotomía exploradora se realizó resección cornual y posteriormente dilatación y curetaje de la cavidad uterina. La anatomía patológica confrmó el diagnóstico. Negativizó ß-hGC a las 7 semanas después de la cirugía. Abstract in english Background: The incidence of ectopic pregnancy is 20 per 1,000 pregnancies. The cornual ectopic pregnancy is found in 2-4%. Hydatidiform moles occur in 1 per 1000 pregnancies in USA and 1 per 500 in Mexico. Thus, the incidence of the two occurring together is very rare. Only 40 cases have been repor [...] ted in the medical literature, the incidence estimate is 0.04%. Clinic case: We analyzed a 30 year old woman patient case, gravida 1, with 8 weeks’ gestation by last menstrual period, came at the Hospital Universitario “Dr. José Eleuterio González”, Monterrey, Nuevo León, with complaints of nausea and vomiting for 1 day and abdominal pain, and transvaginal bleeding. A cualitative pregnancy test was positive. Physical examination revealed diffuse abdominal tenderness and peritoneal signs. The transvaginal ultrasonography showed a multicystic echogenic mass within the uterus near cornual region consistent with a molar pregnancy. A cornual resection was performed followed by dilation and curettage. Pathologic diagnosis was confrmed. The monitoring of ß-hGC titers was negative 7 weeks after surgery.

Clara del Carmen, Flores Acosta; Oralia, Barboza Quintana; Oscar, Vidal Gutiérrez; Felipe, Morales Martínez.

152

Evolución postquirúrgica del cierre de la herida quirúrgica por segunda intención en terceros molares / Postoperative evolution of surgical wound closure by secondary intention in third molars  

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Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish Introducción: la cirugía del tercer molar constituye uno de los tratamientos que con frecuencia se realiza en la práctica estomatológica. Actualmente es la técnica quirúrgica convencional más empleada. Objetivo: evaluar la evolución postoperatoria en los pacientes con terceros molares inferiores sem [...] iretenidos, con cierre de la herida quirúrgica por segunda intención, según la presencia de dolor, edema, sangramiento, sepsis y trismo mandibular. Material y método: se realizó un estudio analítico, longitudinal, prospectivo de casos y controles en el Hospital General Docente "Abel Santamaría Cuadrado" de Pinar del Río en el período comprendido desde septiembre de 2010 hasta julio de 2013. La muestra estuvo compuesta por 120 pacientes que asistieron a la consulta de cirugía maxilofacial por presentar los terceros molares mandibulares semiretenidos. Para el análisis estadístico se emplearon las técnicas de estadística comparativas de Kolmogorov-Smirnov y la de probabilidad exacta de Fisher. Resultados: en los 60 pacientes operados mediante la técnica quirúrgica convencional con sutura del colgajo vestibular, a las 72 horas presentaban dolor, en 48 era moderado para un 80%, y en 12, era intenso para un 20%. De los 60 que fueron operados mediante la técnica quirúrgica con cierre de la herida por segunda intención, a las 72 horas solo 15 pacientes para un 25% tenían dolor ligero. Conclusiones: hubo una mejor evolución postoperatoria en los pacientes con cierre de la herida quirúrgica por segunda intención, con un 45% de los casos sin dolor y un 90% con edema ligero a las 72 horas de operados; no presentaron síntomas como sangramiento, sepsis, ni trismo mandibular. Abstract in english Introduction: third molar surgery is a treatment often performed during the dentistry practice work. Nowadays it is the most used conventional surgical technique. Objective: to evaluate the postoperative results in patients with non-semi-retained mandibular molars, with closure of the wound by secon [...] dary intention, regarding aspects such as the presence of pain, edema, bleeding, sepsis and mandibular trismus. Methods: an analytical, longitudinal, prospective case-control study was conducted at Abel Santamaria Cuadrado General Teaching Hospital in Pinar del Río, in the period from September 2010 to July 2013. The sample consisted of 120 patients attending the maxillofacial surgery office because of semi-retained mandibular third molars. For statistical analysis we used the Kolmogorov-Smirnov statistic methods and the Fisher exact probability variant. Results: for the 60 patients operated by conventional surgical suture with vestibular flap, after 72 hours pain appeared, and it was moderate in 48-80%, and at 12 hours, it was intense for the 20%. For the 60 patients operated by surgical technique with wound closure by secondary intention, after 72 hours only 15 patients (25%) had mild pain. Conclusions: There was a better postoperative result in patients with surgical wound closure by secondary intention, with 45% of the patients with no pain and 90% with slight edema after 72 hours of surgery; the study showed no symptoms such as bleeding, sepsis, or mandibular trismus.

Felicia Caridad, Morejón Álvarez; Yan, Álvarez Rodríguez.

1008-10-01

153

Incomplete molar pregnancy with live coexisting fetus: a case report  

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Conclusion: The rate of pregnancy complications such as hypertension, hyperthyroidism, and obstetrics hemorrhage and also the risk of Gestational Trophoblastic Neoplasm (GTN are increasing in incomplete molar pregnancy. Therefore, early diagnosis and timely treatment of molar pregnancy is very important to reduce maternal morbidity and mortality.

Leila Pourali

2014-03-01

154

Fusion of complex odontome with permanent mandibular molar.  

Science.gov (United States)

Odontomas are malformation of the dental tissue, arising during normal tooth development. They are usually asymptomatic, but often associated with tooth eruption disturbance. This article reports a case of complex odontome in a 23-year-male, which hampered the eruption of mandibular right second molar as well devitalization of first molar. PMID:23066237

Talari, Bharathi H; Ananda, Divya; Prince, Christo N; Annaporna, Chandrakala S; Pranavadhyani

2012-08-01

155

Molar incisor hypomineralisation: clinical management of the young patient.  

LENUS (Irish Health Repository)

Molar incisor hypomineralisation (MIH) is a common developmental condition resulting in enamel defects in first permanent molars and permanent incisors. It presents at eruption of these teeth. Early diagnosis is essential since rapid breakdown of tooth structure may occur, giving rise to acute symptoms and complicated treatment. The purpose of this article is to review MIH and illustrate its clinical management in young children.

Daly, Dympna

2009-04-01

156

Taurodont molars: Review of literature and radiological features  

International Nuclear Information System (INIS)

Taurodontic molar teeth are present as a clinical entity in modem man. This is a suggestion that the occurrence has a racial bias. The importance of the differential diagnosis of teeth with enlarged pulp is discussed, and the possible influence of taurodontic molars on treatment planning is outlined. (author)

157

Hydrophobic effects on partial molar volume  

Science.gov (United States)

The hydrophobic effects on partial molar volume (PMV) are investigated as a PMV change in the transfer of a benzenelike nonpolar solute from the nonpolar solvent to water, using an integral equation theory of liquids. The volume change is divided into two effects. One is the "packing" effect in the transfer from the nonpolar solvent to hypothetical "nonpolar water" without hydrogen bonding networks. The other is the "iceberg" effect in the transfer from nonpolar water to water. The results indicate that the packing effect is negative and a half compensated by the positive iceberg effect. The packing effect is explained by the difference in the solvent compressibility. Further investigation shows that the sign and magnitude of the volume change depend on the solute size and the solvent compressibility. The finding gives a significant implication that the exposure of a hydrophobic residue caused by protein denaturation can either increase or decrease the PMV of protein depending on the size of the residue and the fluctuation of its surroundings.

Imai, Takashi; Hirata, Fumio

2005-03-01

158

Molar extinction coefficients of some fatty acids  

Energy Technology Data Exchange (ETDEWEB)

The attenuation of gamma rays in some fatty acids, viz. formic acid (CH{sub 2}O{sub 2}), acetic acid (C{sub 2}H{sub 4}O{sub 2}), propionic acid (C{sub 3}H{sub 6}O{sub 2}), butyric acid (C{sub 4}H{sub 8}O{sub 2}), n-hexanoic acid (C{sub 6}H{sub 12}O{sub 2}), n-caprylic acid (C{sub 8}H{sub 16}O{sub 2}), lauric acid (C{sub 12}H{sub 24}O{sub 2}), myristic acid (C{sub 14}H{sub 28}O{sub 2}), palmitic acid (C{sub 16}H{sub 32}O{sub 2}), oleic acid (C{sub 18}H{sub 34}O{sub 2}) and stearic acid (C{sub 18}H{sub 36}O{sub 2}), has been measured at the photon energies 81, 356, 511, 662, 1173 and 1332 keV. Experimental values for the molar extinction coefficient, the effective atomic number and the electron density have been derived and compared with theoretical calculations. There is good agreement between experiment and theory.

Sandhu, G.K.; Singh, Kulwant; Lark, B.S.; Gerward, L. E-mail: gerward@fysik.dtu.dk

2002-10-01

159

Prevalent of root resorption of second molar adjustment the impacted third molar in prepiacal and panoramic radiographs  

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Full Text Available   Background and Aims: Impacted third molar reduces the bone level in the distal aspect of second molar, and sometimes it can lead to root resorption of the adjacent tooth. The purpose of this study was to determine this resorption using panoramic and periapical radiographs.   Materials and Methods: In this cross-sectional descriptive study 54 patient (28 men, 26 women above 15 years old with the average of 22 years in Oral and Maxillofacial Department of Tehran University were studied. A periapical radiography from the third molar and a panoramic radiograph were taken from each patient (Because of their routine use and evaluation of accuracy of panoramic compared with periapical, and the magnitude of the root resorption for the second molar was determined by 2 observers and written in a questionnaire. Data were analyzed using Fisher test.   Results: The prevalence of the root resorption of the second molar adjacent to the impacted third molar in the panoramic and the periapical radiographies, with respect to the limitation of the sample size were 46.3% and 31.5%, respectively, with 95% confidence(P>0.05. Most of these resorptions were in the cervical third of the second molar roots and in cases in which the third molars were mesially oriented or horizontal. There was also no significant difference between panoramic and periapical radiographs.   Conclusion: Due to the increased risk of the resorption of the second molar adjacent to the third molar, extraction of the impacted third molars, especiall y mesially oriented or horizontal ones are recommended.

Mohammad Ebrahimi Saravi

2013-10-01

160

Anesthetic implications of a partial molar pregnancy and associated complications.  

Science.gov (United States)

In the United States, molar pregnancy occurs between 1 in 1,200 and 1 in 2,500 pregnancies. The critical nature of complications associated with a molar pregnancy requires advanced perioperative anesthetic management. This case report details the perioperative events of a 34-year-old gravida 5, para 3, with a partial molar pregnancy who underwent general anesthesia for a dilatation and curettage procedure, following therapeutic termination of a coexisting fetus at 18 weeks' gestation. Her initial presentation, anesthetic and operative management, and postoperative course are described clearly. The medical and anesthetic interventions required for treatment of molar pregnancy are reviewed. Of molar pregnancies, 80% are uncomplicated and follow an unremarkable course. However, for the remaining 20%, complications can be severe and may lead to substantial morbidity and mortality in otherwise healthy women. PMID:11759139

Celeski, D; Micho, J; Walters, L

2001-02-01

161

Pulpotomies with portland cement in human primary molars  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english Two clinical cases in which Portland cement (PC) was applied as a medicament after pulpotomy of mandibular primary molars in children are presented. Pulpotomy using PC was carried out in two mandibular first molars and one mandibular second molar, which were further followed-up. At the 3, 6 and 12-m [...] onth follow-up appointments, clinical and radiographic examinations of the pulpotomized teeth and their periradicular area revealed that the treatments were successful in maintaining the teeth asymptomatic and preserving pulpal vitality. Additionally, the formation of a dentin bridge immediately below the PC could be observed in the three molars treated. PC may be considered as an effective alternative for primary molar pulpotomies, at least in a short-term period. Randomized clinical trials with human teeth are required in order to determine the suitability of PC before unlimited clinical use can be recommended.

Taísa Regina, Conti; Vivien Thiemy, Sakai; Ana Paula Camolese, Fornetti; Ana Beatriz Silveira, Moretti; Thais Marchini, Oliveira; Natalino, Lourenço Neto; Maria Aparecida Andrade Moreira, Machado; Ruy Cesar Camargo, Abdo.

2009-02-01

162

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available ... DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00:00:24 WOMAN ... hour, live from Beth Israel Medical Center in New York City, you'll hear about the tough decisions ...

163

A case of inferior lumbar hernia  

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Full Text Available In this article we report a case of inferior lumbar hernia. The patient underwent preperitoneal meshplasty. The patient is well on follow up with no recurrence. The relevant literature has been reviewed and management discussed in brief. [Int J Res Med Sci 2013; 1(1.000: 33-35

Vidhyasagar M. Sharma

2013-02-01

164

Hemianopsia altitudinal inferior por aracnoidite optoquiasmática  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese Os autores relatam o caso de um paciente de 48 anos de idade, queixando-se de falta de visão nas metades inferiores dos campos visuais, há aproximadamente um ano. A doença evoluiu progressivamente após sinusotomia maxilar e frontal. Os diversos exames complementares realizados nada revelaram de anor [...] mal. Reação de Wassermann sempre negativa no sangue. Ao exame oftalmoscópico ficou patenteado, em AO, franca atrofia, no setor superior das papilas e edema pronunciado em suas metades inferiores. O exame campimétrico revelou nítida hemianopsia altitudinal inferior. As demais funções neurológicas e o exame clínico geral nada mais demonstraram de anormal. A iodoventriculografia evidenciou sinais radiológicos de aracnoidite optoquiasmática. À intervenção cirúrgica, foi verificada a existência de aracnoidite intensa na região quiasmática, com compressão dos nervos ópticos e do próprio quiasma. Após a intervenção cirúrgica, exames oftalmoscópicos sucessivos demonstraram melhora franca da acuidade visual em AO e discreto aumento dos campos visuais. Finalizando, os AA. tecem considerações sôbre as prováveis causas etiológicas dêsse tipo de reação meníngea. Abstract in english Report of a case, in a male, white, 48 years old man, who presented a blindness of inferior half of visual fields, since one year before his admission in the hospital. The disease progressed slowly after a maxillar and frontal sinusotomy was performed. Several complementary tests were normal. Wasser [...] mann reactions were normal. Ophthalmologic examination revealed in superior half of papillae, in both eyes, a severe atrophy and edema in their inferior halves. Other neurological functions and clinical examination were normal. Ventriculography with lipiodol showed radiological signs of optochiasmatic arachnoiditis. Operation showed a severe arachnoiditis in chiasmatic region, which compressed optic nerves and chiasma. After intervention, successive ophthalmologic examinations revealed a considerable improvement of visual acuity, in both eyes, and a moderate increase of visual fields. The probable etiologic causes of this kind of meningeal reaction are discussed.

R., Melaragno Filho; P. Braga, Magalhães; Rolando A., Tenuto.

1949-09-01

165

Correção da hipoplasia de polo inferior da mama / Surgical correction of breast inferior pole hypoplasia  

Scientific Electronic Library Online (English)

Full Text Available INTRODUÇÃO: As mamas com hipoplasia de polo inferior apresentam aspecto desarmônico, com o sulco inframamário alto, predominância de volume glandular nos quadrantes superiores, e, consequentemente, direcionamento inferior do complexo areolopapilar. É meta desejável, nesses casos, a correção da forma [...] desarmônica das mamas, bem como de eventuais assimetrias, com cicatrizes mínimas ou inconspícuas. O objetivo deste trabalho é apresentar técnica cirúrgica para correção de hipoplasia de polo inferior da mama. MÉTODO: A técnica cirúrgica utilizou retalho interno rodado para reconfigurar a mama e reposicionar o sulco inframamário, tendo como vias de acesso cirúrgico tão somente as cicatrizes por onde se colocam as próteses. RESULTADOS: A técnica descrita foi utilizada em 4 pacientes com hipoplasia de polo inferior de mama, com idades variando entre 19 anos e 27 anos. Os resultados demonstram que a correção da deformidade mamária foi alcançada adequadamente, bem como o reposicionamento do sulco inframamário, sem provocar irregularidades no contorno inferior da mama. CONCLUSÕES: A técnica proposta é uma alternativa adequada para o tratamento de casos selecionados de deformidade mamária com hipoplasia de polo inferior. Abstract in english BACKGROUND: Breasts with inferior pole hypoplasia have a disharmonious appearance owing to a high inframammary fold and the prevalence of glandular volume in the upper quadrants that results in a lower inclination of the nipple-areola complex. In these patients, the goal is to correct the disharmoni [...] ous shape of their breasts and possible asymmetries while causing minimal or inconspicuous scars. The aim of this study was to present a surgical technique to correct breast inferior pole hypoplasia. METHODS: The surgical technique involved a rotated internal flap to reshape the breast and relocate the inframammary fold, a result achieved using only the scores where the implants would be positioned as surgical access routes. RESULTS: The procedure described here was used in four patients aged 19-27 years with breast inferior pole hypoplasia. The results demonstrate that the correction of breast deformities was properly achieved, and the inframammary fold was repositioned without any irregularities in the inferior breast contour. CONCLUSIONS: The technique proposed here is a suitable alternative for the treatment of selected cases of breast deformities with hypoplasia of the inferior pole.

Victor Vieira, Orsi; Gustavo Levacov, Berlim; Carlos Eduardo Ochoa, Tagliari; Diego Ilha, Thomasi; Pedro Bilibio, Westphalen; João Valter, Pires Junior.

2013-06-01

166

Influence of cervical preflaring on determinationof apical file size in mandibular molars: SEM analysis  

Scientific Electronic Library Online (English)

Full Text Available Este estudo investigou a influência do alargamento cervical feito com diferentes instrumentos rotatórios na determinação do instrumento apical inicial (IAI) das raizes mésio-vestibulares de molares inferiores. Foram utilizados 50 molares inferiores cujas raízes mesiais apresentavam dois forames apic [...] ais nitidamente separados (mésio-vestibular e mésio-lingual). Após o acesso à câmara pulpar de forma convencional e remoção do tecido pulpar, o comprimento de trabalho foi definido a 1 mm do ápice radicular. Os dentes foram divididos aleatoriamente em cinco grupos (n= 10) de acordo com o tipo de instrumento utilizado no alargamento cervical. No grupo 1, o IAI foi definido sem o prévio alargamento dos terços médio e cervical das raízes. Nos grupos 2 a 5, o terço cervical e médio do canal radicular foi alargado com as brocas de Gates-Glidden, instrumentos Pro Taper, Endo Flare e brocas LA Axxes, respectivamente. A determinação do IAI foi realizada manualmente com limas tipo K em ordem crescente de diâmetro a partir da lima 08 até se chegar ao instrumento que permitisse ao operador ter a sensação tátil do mesmo estar firmemente ajustado ao CRT. O instrumento que correspondeu ao IAI foi fixado no interior do canal radicular com cianocrilato de metila. Com o IAI posicionado, os dentes foram seccionados transversalmente até 1 mm do ápice. As seções transversais do CRT foram observadas através da microscopia eletrônica de varredura e os desajustes entre o diâmetro do canal e o diâmetro do IAI foram calculados com a função "régua" (FEG) do software do próprio microscópio. Os resultados foram avaliados estatisticamente pelo testes de Kruskal-Wallis e Dunn ao nível de significância de 5%. Houve diferenças estatisticamente significantes entre os grupos (p Abstract in english This study investigated the influence of cervical preflaring with different rotary instruments on determination of the initial apical file (IAF) in mesiobuccal roots of mandibular molars. Fifty human mandibular molars whose mesial roots presented two clearly separated apical foramens (mesiobuccal an [...] d mesiolingual) were used. After standard access opening and removal of pulp tissue, the working length (WL) was determined at 1 mm short of the root apex. Five groups (n=10) were formed at random, according to the type of instrument used for cervical preflaring. In group 1, the size of the IAF was determined without preflaring of the cervical and middle root canal thirds. In groups 2 to 5, preflaring was performed with Gates-Glidden drills, ProTaper instruments, EndoFlare instruments and LA Axxes burs, respectively. Canals were sized manually with K-files, starting with size 08 K-files, inserted passively up to the WL. File sizes were increased until a binding sensation was felt at the WL and the size of the file was recorded. The instrument corresponding to the IAF was fixed into the canal at the WL with methylcyanoacrylate. The teeth were then sectioned transversally 1 mm short of the apex, with the IAF in position. Cross-sections of the WL region were examined under scanning electron microscopy and the discrepancies between canal diameter and the diameter of IAF were calculated using the tool "rule" (FEG) of the microscope's proprietary software. The measurements (µm) were analyzed statistically by Kruskal-Wallis and Dunn's tests at 5% significance level. There were statistically significant differences among the groups (p0.05) were found among the rotary instruments. In conclusion, cervical preflaring improved IAF fitting to the canals at the WL in mesiobuccal roots of maxillary first molars. The rotary instruments evaluated in this study did not differ from each other regarding the discrepancies produced between the IAF size and canal diameter at the WL.

Marcia da Silva, Schmitz; Roberto, Santos; Alexandre, Capelli; Marcos, Jacobovitz; Júlio César Emboava, Spanó; Jesus Djalma, Pécora.

167

Análise da presença do canal cavo-inter-radicular em molares: estudo in vitro = ‘In vitro’ analysis of acessory foramina in molar teeth  

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Full Text Available Evidências significativas sugerem a inter-relação existente entre a região de furca de dentes multirradiculados com o desenvolvimento de lesões endo-periodontais, principalmente, quando da presença do canal cavo-inter-radicular. Com o objetivo de compreender os mecanismos envolvidos na etiopatogenia de tais doenças periodontais, assim como propiciar o diagnóstico e o tratamento precoces, buscou-se melhor caracterizar essa região dando ênfase à morfologia do assoalho da câmara pulpar. Para este estudo foram selecionados 42 molares humanos extraídos, sendo 21 superiores e 21 inferiores. Após realizadas as aberturas coronárias e localizadas as entradas dos canais radiculares, os dentes tiveram parte das porções coronária e radicular cortada perpendicularmente ao longo do seu eixo, com o auxílio de disco de carburundum. Depois de uma criteriosa limpeza dos espécimes, esses foram secos em câmara de ponto crítico, sendo, a seguir, preparados para análise em microscópio eletrônico de varredura (Philips®, modelo XL30, Holanda. Os dados foram analisados através do Teste U de Mann- Whitney e do teste Qui-quadrado. Com base nos resultados obtidos e de acordo com a literatura pertinente, pôde-se verificar que: 1. o diâmetro e o número de túbulos dentinários encontrados por mm2 assim como a presença de foraminas no assoalho da câmara pulpar sugerem a permeabilidade dessa região; 2. o diâmetro maior de algumas foraminas identifica a presença do canal cavo-inter-radicular. Mounting evidence has suggested a relationship between the existing furcation region in multirradicular teeth and the development of endoperiodontal lesions. This effect is particulary pronounced when accessory foramina are present. In order to improve our understanding of the mechanisms involved in the etiopathogeny of periodontal disease, as well as facilitate early diagnosis and treatment, an attempt was made to characterize this region with special attention to the morphology of the pulp chamber floor. Forty-two extracted human molars (21 maxillary and 21 mandibular molars were used in this study. After the crows had been resected and the root canals openings identified, part of the coronal and radicular sections of the teeth were split longitudinally their axes with carborundum disc. After meticulous cleansing, the teeth were dried in a critical point dry chamber and then prepared for analysis in a Philips® XL-30, Holland, SEM. The collected data were submitted to statistical analysis by Mann-Whitney Test and Qui-square Test. The results obtained and a revision of literature shows that: 1. the number and diameter of dentinal tubules per mm2 found, as well as the presence of foramina on the pulp chamber floor are indicators of permeability in this region; 2. the wider diameter of some foramina indicate the presence of accessory foramina.

Machado, Geovana

2005-01-01

168

Extração de incisivo inferior: uma opção de tratamento ortodôntico / Lower incisor extraction: an orthodontic treatment option  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Languages: English, Portuguese Abstract in portuguese A exodontia de um incisivo inferior pode ser considerada uma opção valiosa na busca de excelência nos resultados ortodônticos para obtenção de máxima função, estética e estabilidade. O objetivo deste estudo foi reunir informações referentes às indicações, contraindicações, vantagens, desvantagens e [...] estabilidade dos resultados obtidos nos tratamentos realizados com extração de um incisivo inferior. Essa opção de tratamento pode ser indicada em más oclusões com discrepância de volume dentário anterior devido a incisivos superiores estreitos e/ou incisivos inferiores largos. É contraindicada em más oclusões sem discrepância anterior ou com discrepâncias ocasionadas por incisivos superiores largos e/ou incisivos inferiores estreitos. A literatura sugere maior estabilidade pós-tratamento quando comparada com a opção de extrações de pré-molares. Além do diagnóstico cuidadoso, obtido com a colaboração do set-up, a habilidade e a experiência clínica do profissional são importantes para o sucesso dos resultados ortodônticos alcançados com essa opção de tratamento Abstract in english Lower incisor extraction can be regarded as a valuable option in the pursuit of excellence in orthodontic results in terms of function, aesthetics and stability. The aim of this study was to gather information about the indications, contraindications, advantages, disadvantages and stability of the r [...] esults achieved in treatments performed with lower incisor extraction. This treatment option may be indicated in malocclusions with anterior dental volume discrepancy due to narrow maxillary incisors and/or large mandibular incisors. It is contraindicated in malocclusions without anterior discrepancy or with discrepancies caused by large maxillary incisors and/or narrow mandibular incisors. The literature suggests this method affords improved posttreatment stability compared with premolar extraction. As well as a careful diagnosis, established with the aid of a diagnostic setup, professional skills and clinical experience are instrumental in achieving successful orthodontic results with this treatment option

Mírian Aiko Nakane, Matsumoto; Fábio Lourenço, Romano; José Tarcísio Lima, Ferreira; Silvia, Tanaka; Elizabeth Norie, Morizono.

2010-12-01

169

Litterfall, litter decomposition and nitrogen mineralization in old-growth evergreen and secondary deciduous Nothofagus forests in south-central Chile Aporte, descomposición de hojarasca y mineralización de nitrógeno en bosques siempreverdes de antiguo crecimiento y bosques secundarios deciduos, centro-sur de Chile  

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Full Text Available South Chilean forest ecosystems represent one of the largest areas of old-growth temperate rainforests remaining in the Southern hemisphere and have a high ecological value, but suffer from deforestation, invasion by exotic species, fragmentation, and increasing atmospheric nitrogen (N deposition. To support sustainable forest management, more knowledge is required on nutrient cycling of these ecosystems. Therefore, a descriptive study of nutrient dynamics was done in four Valdivian rainforests in the lower Andes range of south Chile: old-growth and altered evergreen stands and unmanaged and managed secondary deciduous stands. Time series were measured for (i mass (four year and nutrient content (N, K, Ca, and Mg; one year of litterfall, (ii decomposition and nutrient dynamics (N, C, K, Ca, Mg, and P; one year of leaf litter and Saxegothaea conspicua bark litter, and (iii in situ topsoil net N mineralization (one year. Litterfall in the four stands ranged from 3.5 to 5.8 ton ha-1 yr-1, was temporarily lower in the managed than in the unmanaged deciduous stand and had a different seasonality in the evergreen stands than in the deciduous stands. Leaf litter decomposed faster (on average 32 % mass loss after one year than bark litter (8 % but without significant differences between leaf litter types. Net N in evergreen leaf litter decreased during decomposition but increased in deciduous leaf litter. Net soil N mineralization was fastest in the pristine evergreen stand, intermediate in the deciduous stands and slowest in the altered evergreen forest. Given the absence of replicated stands, the definite impact of forest type or management regime on the internal nutrient cycling cannot be demonstrated. Nevertheless, the results suggest that management can affect nutrient turnover by altering species composition and forest structure, while recent (five years selective logging in secondary deciduous forest did not affect litter decomposition or N mineralization rates in the present study.Los ecosistemas forestales del sur de Chile presentan un gran valor ecológico pues constituyen una de las mayores áreas del hemisferio Sur con existencias de bosques templados lluviosos. Están sometidos a procesos de deforestación, invasión de especies exóticas, fragmentación e incremento de depositación de nitrógeno (N atmosférico. Para apoyar su manejo sustentable se requiere de mayor conocimiento en el ciclo de nutrientes de estos ecosistemas. Se estudia la dinámica de nutrientes en cuatro sitios de bosques lluviosos valdivianos de la precordillera de los Andes, centro-sur de Chile: un bosque siempreverde de antiguo crecimiento prístino y otro alterado, un bosque caducifolio secundario con manejo silvícola y otro sin. Durante el período octubre 2002 -septiembre 2006, se estimaron (i masa de la hojarasca (cuatro años y contenido de nutrientes de la hojarasca (un año, (ii descomposición y dinámica de nutrientes de hojarasca (un año y de la corteza de Saxegothaea conspicua, y (iii mineralización neta de nitrógeno (N-min en el suelo in situ (un año. El aporte de hojarasca en los cuatro sitios fluctúa desde 3.5 hasta 5.8 ton ha-1 año-1, y es temporalmente menor en bosque caducifolio manejado, respecto del caducifolio sin manejo. Además, presentan una estacionalidad en los siempreverdes que es diferente, respecto de los deciduos. La hojarasca se descompone más rápidamente (promedio 32 % pérdida de masa después de un año que la corteza (8 %, pero no se presentaron diferencias significativas en la hojarasca. El N neto en la hojarasca de los bosques siempreverdes disminuye durante la descomposición, pero se incrementa en la hojarasca de los deciduos. La N-mineralización neta del suelo fue completa en el bosque siempreverde prístino, intermedia en los bosques deciduos y el más baja en el bosque siempreverde alterado. Dada la ausencia de réplicas en las parcelas, no puede ser demostrado el impacto definido del tipo de bosque o régimen de manejo en el ciclo interno de nutrientes. Sin embargo, los r

JEROEN STAELENS

2011-03-01

170

Elongational viscosity of narrow molar mass distribution polystyrene  

DEFF Research Database (Denmark)

Transient and steady elongational viscosity has been measured for two narrow molar mass distribution polystyrene melts of molar masses 200 000 and 390 000 by means of a filament stretching rheometer. Total Hencky strains of about five have been obtained. The transient elongational viscosity rises above the linear viscoelastic prediction at intermediate strains, indicating strain hardening. The steady elongational viscosities are monotone decreasing functions of elongation rate. At elongation rates larger than the inverse reptation time, the steady elongational viscosity scales linearly with molar mass at fixed elongation rate.

Bach, Anders; Almdal, Kristoffer

2003-01-01

171

Parálisis traumática del recto inferior Traumatic paralysis of the inferior rectus muscle  

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Full Text Available La parálisis constituye una interrupción completa de la acción muscular por afectación de la inervación responsable de la motilidad, a diferencia de la paresia, en la cual la afectación es parcial. La parálisis aislada del músculo recto inferior es clínicamente infrecuente caracterizada por hipertropía del ojo afectado que se acentúa a la abducción.El paciente presenta diplopía vertical que aumenta con la mirada hacia abajo sobre todo abajo y afuera, puede presentar tortícolis, lo que hace que se deprima el mentón. Es una entidad que no debemos olvidar en los traumatismo que afecten el piso de la órbita. Acude a consulta por presentar diplopía vertical de 7 meses de evolución. Al examen de motilidad ocular había una hipertropía de 15° x Hirshberg; 30 Dp base inferior por barra de prismas y marcada tortícolis con limitación en la depresión. El Test de fuerza generada mostró una ausencia de fuerza. Nuestra impresión diagnóstica fue parálisis traumática del músculo recto inferior derecho, por lesión directa. El tratamiento realizado fue la transposición total de los músculos rectos medial y recto lateral al músculo recto inferior derecho siguiendo la espiral de Tillaux horizontales con el objetivo de lograr el alineamiento de los ojos y eliminar la posición anómala de la cabeza, para lo cual se tiene en cuenta que la parálisis prolongada del recto inferior puede provocar contractura del recto superior ipsilateral, aspecto este que limita la depresión no solo en abducción sino también en aducción.Paralysis represents a complete interruption of muscular action due to problems in enervation in charge of motility, unlike paresia in which the effect is partial. The isolated inferior rectus muscle paralysis is infrequent and is characterized by the affected eye hypertropia that increases in abduction. The patient presents vertical diplopia that increases when he looks down and out, he can also suffer torticollis which depresses his chin. This is a disease that must not be ignored in patients with orbit floor traumatism. A patient went to see the doctor with vertical diplopia for 7 months. The ocular motility exam disclosed 15 ° × Hirshberg hypertrophy, 30 Dp inferior base by prism bar and marked torticollis with restricted depression. The definitive diagnosis was a traumatic paralysis of the right inferior rectus muscle due to a direct lesion. The treatment was total transposition of the medial and lateral rectus muscle to the right inferior rectus muscle following the Tillaux horizontal spiral, with the objective of reaching the eye's alignment and eliminating the anomalous position of the head. One kept in mind that the prolonged paralysis of the inferior rectus muscle may provoke contracture of the ipsilateral upper rectus, thus limiting the depression on abduction and adduction.

Rosa Naranjo Fernández

2010-12-01

172

Leiomyosarcoma arising from the inferior mesenteric vein  

OpenAIRE

Leyomiosarcomas arising from the portal/mesenteric venous system are very rare tumours, and only a few cases have been reported in the global literature. As the other leyomiosarcomas of vascular origin, they are associated with a poor prognosis. The present report describes the case of a 66-year-old woman with a leyomiosarcoma of the inferior mesenteric vein, unexpectedly found during a CT scan performed for another indication. A brief review of the literature is also given. The patient under...

Clemente, Gennaro; Sarno, Gerardo; Barbaro, Brunella; Nuzzo, Gennaro

2009-01-01

173

A novel technique for inferior rectus recession  

Science.gov (United States)

Purpose To introduce a novel technique of inferior rectus recession operation to allow larger amounts of recession without causing lower lid retraction and to compare this method with the results obtained in standard inferior rectus recession. Material and methods This study included 20 patients operated on in the authors’ clinic. The median age of the patients was 24.5±18.6 (4–73) years and the median follow-up was 9.3±11.8 (3–43) months. Ten patients operated on with the standard method were labeled Group 1 and ten patients operated on with the new method were labeled Group 2. Without exceeding 4 mm, inferior rectus recession to the whole muscle was performed in Group 1 patients. Inferior rectus recession was also performed on patients in Group 2 following the new method. Using a spatula, approximately 10% of the muscle surface fibers were detached intact as a thin layer, and the remaining 90% of deeper fibers were recessed 4–8 mm as planned. Patients’ preoperative deviations and lower lid positions were recorded. The same parameters were checked in the first and third month postoperatively. Both groups were evaluated retrospectively by screening their files, and the Mann–Whitney U test was used for statistical evaluation. Results Lower lid retraction was seen in four patients of Group 1. There was no retraction in Group 2. While there was a need to perform additional vertical muscle procedures for vertical deviations and lower lid retractions in Group 1, it was observed that there was no need for additional procedures in Group 2 patients. There was a statistically meaningful difference between the two procedures (P<0.05). Conclusion This novel technique was found to be an effective surgical method for permitting more recession without the risk of lower lid retraction. PMID:24492531

Gokyigit, Birsen; Akar, Serpil; Yilmaz, Omer Faruk

2014-01-01

174

Transcatheteral occlusion of the inferior mesenteric artery  

International Nuclear Information System (INIS)

Three times the inferior mesenteric artery was embolized in one patient with recurrent gastrointestinal hemorrhage due to hypernephroma invading the left colon (tumorrecurrency after nephrectomy and radiation-therapy). The patient was inoperable. The bleeding could be stopped repetedly for several weeks. Fibrospum particles were used with the aim to obtain incomplete ischemia. So the danger to produce local necrosis was thought to be limited. (orig.)

175

Magnetic resonance of the inferior vena cava.  

Science.gov (United States)

MRI was performed in 54 patients with abnormalities of the inferior vena cava (IVC). These included 16 patients with extrinsic IVC compression, 32 patients with intrinsic IVC abnormalities, and 6 patients with IVC dilatation. All patients had spin-echo imaging, and 21 had MR angiography. While presaturated spin-echo images showed intrinsic lesions to advantage, collateral vessels were best appreciated with MR angiography. The IVC is well evaluated with MRI techniques. PMID:1564987

Colletti, P M; Oide, C T; Terk, M R; Boswell, W D

1992-01-01

176

Microvascular Organization of the Cat Inferior Colliculus  

OpenAIRE

Brain neural activity depends critically on the blood supply to a given structure. The blood supply can differ within and between divisions, which may have functional significance. We analyzed the microvascular organization of the cat inferior colliculus (IC) to determine if the capillary distribution is homogenous throughout. The IC consists of the central nucleus (CN), the dorsal cortex (DC), and the lateral cortex (LC), each with different roles in auditory behavior and perception. Plastic...

Song, Yohan; Mellott, Jeffrey G.; Winer, Jeffery A.

2010-01-01

177

Intraosseous Hemangioma of the Inferior Turbinate  

OpenAIRE

The nasal cavity harbors an enormous variety of neoplasms, including epithelial and mesenchymal tumors. Hemangioma is an infrequent mesenchymal tumor of the nasal cavity, mostly arising in the mucosa and rarely in the bones. We describe the case of a 73-year-old woman who was referred to our hospital with a tumor in her left nasal cavity. The tumor originated from the left inferior turbinate. Histological examination subsequent to complete excision revealed that the tumor was an intraosseous ...

Michiko Hashimoto; Kazuya Takeda; Yukinori Takenaka

2010-01-01

178

Leiomyosarcoma of the inferior vena cava  

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Full Text Available Vascular leiomyosarcoma (LMS are unique. The inferior vena cava (IVC is the most affected organ (about 38% cases. We report the observation of a 50-year old woman who consulted for right upper quadrant pain. Imaging studies revealed a retroperitoneal mass that mimic a LMS of the IVC. The patient was operated. A resection of the IVC along with the tumor was performed without reconstruction. The management of LMS is surgical and depends upon the location and tumor characteristics.

Ben Abid Sadri

2013-01-01

179

Leiomyosarcoma of the inferior vena cava.  

Science.gov (United States)

Vascular leiomyosarcoma (LMS) are unique. The inferior vena cava (IVC) is the most affected organ (about 38% cases). We report the observation of a 50-year old woman who consulted for right upper quadrant pain. Imaging studies revealed a retroperitoneal mass that mimic a LMS of the IVC. The patient was operated. A resection of the IVC along with the tumor was performed without reconstruction. The management of LMS is surgical and depends upon the location and tumor characteristics. PMID:24765501

Sadri, Ben Abid; Amine, Attaoui Mohamed; Zeineb, Mzoughi; Nizar, Miloudi; Lassad, Gharbi; Khalfallah, Mohamed Tahar

2013-01-25

180

Leiomyosarcoma of the inferior vena cava  

OpenAIRE

Vascular leiomyosarcoma (LMS) are unique. The inferior vena cava (IVC) is the most affected organ (about 38% cases). We report the observation of a 50-year old woman who consulted for right upper quadrant pain. Imaging studies revealed a retroperitoneal mass that mimic a LMS of the IVC. The patient was operated. A resection of the IVC along with the tumor was performed without reconstruction. The management of LMS is surgical and depends upon the location and tumor characteristics.

Ben Abid Sadri; Attaoui Mohamed Amine; Mzoughi Zeineb; Miloudi Nizar; Gharbi Lassad; Mohamed Tahar Khalfallah

2013-01-01

181

Comportamiento fenológico y producción de frutos de algunas especies leñosas del bosque deciduo en el asentamiento Las Peñitas, al sur del estado Aragua / Phenological performance and fruit production of some tree species of a deciduous tropical forest at “Las Peñitas” rural development, south of Aragua state  

Scientific Electronic Library Online (English)

Full Text Available SciELO Venezuela | Language: Spanish Abstract in spanish Con el objeto de identificar botánicamente y caracterizar el comportamiento fenológico de algunas especies leñosas presentes en un bosque deciduo, así como medir la producción de frutos caídos al suelo en 4 especies de leguminosas, se realizaron colectas de muestras para su identificación y se lleva [...] ron observaciones de campo en forma mensual durante todo un año cronológico. Se midió también la producción total de los frutos caídos al suelo en las 4 leguminosas más importantes de la zona. Se encontraron 32 especies botánicas diferentes, predominando la familia Leuminoseae (37%), estando el resto de las especies (63%) distribuidas en 14 familias diferentes Se encontraron solo 4 especies perennifolias (Talissia olivaeformis, Acacia articulata, Caparis fexuosa y Lecythys ollaria) con periodos de floración variable entre los meses de diciembre a agosto. Hubo 12 especies con períodos de floración en la época lluviosa, 6 especies con presencia de hojas durante 6 meses o más y 6 especies con presencia de follaje menos de 6 meses, con el proceso de caducifolia muy marcado. Así mismo, 9 especies mostraron floración en la época seca. La especie Acacia macracanta mostró la mayor producción de frutos (11,8 kg/planta). El bosque deciduo evaluado mostró una gran variabilidad en cuanto a la época de ocurrencia de los distintos eventos fenológicos y una producción de frutos importantes, que pueden ser consumidos por los rumiantes en diversas épocas del año. Abstract in english With the aim to identify botanically and to characterize the phenological performance of some tree species of a deciduous tropical forest, and to measure the fruit production in four legume species, there were made monthly observations and collection of samples for its identification during a whole [...] year. There were found 32 species. The Leuminoseae family was predominant (37%) and the rest of the species were distributed in 14 families. Only four perennial leaves species were found (Talissia olivaeformis, Acacia articulata, Caparis fexuosa and Lecythys ollaria) with flowering period from December to August. There were 12 species with the flowering period during the rainy season. Six species had leaves during 6 months or more and 6 species were without leaves for less than 6 months. Also, it was found 9 species flowering during the dry season. The specie Acacia macrocanta had the highest fruit production (11.8 kg/plant). The deciduous forest has an important production of fruits that could be eaten by the ruminants during different seasons.

José, Valero; Miguel, Benezra; Luis, Chong; Orlando, Guenni.

2006-03-01

182

Partial Molar Volume of Helium Dissolved in Hydrogen  

Science.gov (United States)

We have determined the partial molar volume v ^' of helium dissolved in hydrogen, by analyzing existing data on the concentrations of the liquid and the coexisting vapor phase at high pressures. The partial molar volume can be found from the chemical potential of the helium in solution (v ^' =?2/ p |T,X2, where ?2 is the chemical potential of the helium in solution, and X2 its concentration), and the chemical potential can be determined from pressure and the concentration of the vapor phase, after applying virial corrections. Both v ^' and the virial terms lead to corrections to Henry's law. Over the range studied (0-50 bar and 15.5-29 K), we find that the partial molar volume of helium is equal to the molar volume of pure hydrogen, within a few percent. The results are relevant to recent experiment on the wetting of cesium by helium/hydrogen solutions, and may also have astrophysical applications.

Smith, Madeline; Pettersen, M. S.

2009-03-01

183

Intraoperative accidents associated with surgical removal of third molars  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english Aim: To evaluate the prevalence of intraoperative accidents associated with extraction of third molars and identify possible risk factors. Methods: Prospective study with patients undergoing third molar surgery by residents of the Oral and Maxillofacial Surgery Service at the Federal University of P [...] arana. Epidemiological data were collected from preoperative evaluation forms. During the surgical procedure were evaluated the radiographic position classifications of all third molars removed, using methods such as osteotomy and/or tooth section, time for the procedure and occurrence of any complication. Results: The students extracted a total of 323 teeth. The mean surgical time was 45 min. Conclusions: The prevalence of intraoperative accidents during extraction of third molars was 6.19%. The most prevalent accident was maxillary tuberosity fracture, followed by hemorrhage. Age, positioning of the teeth and use of the techniques of osteotomy and tooth section are possible risk factors.

Aline Monise, Sebastiani; Sara Regina Barancelli, Todero; Giovana, Gabardo; Delson João da, Costa; Nelson Luis Barbosa, Rebelatto; Rafaela, Scariot.

2014-12-01

184

Alternatives for restoration of a hemisected mandibular molar.  

Science.gov (United States)

Hemisection is a common conservative treatment option for periodontally or endodontically compromised teeth. It is most likely to be performed on mandibular molars with class II or III furcation involvement. Their restoration is more critical than implant surgery to ensure the ability to masticate along with the ability to maintain good oral hygiene. There are various alternatives to restore such types of teeth: the remaining root restored as an individual tooth, restoring individual roots with either a molar or premolar morphology using the adjacent tooth as an abutment in a full coverage fixed partial denture, restoring individual roots with either molar or premolar morphology using an inlay type of restoration on the adjacent abutment tooth. This article reports two cases, one treated with molar morphology and an inlay type of restoration and the other with a premolar morphology and a full coverage fixed partial denture. PMID:25080543

Naveen, Y G; Patel, Jayanti R; Parikh, Pooja; Shah, Khyati

2014-01-01

185

Excess Molar Volume of Binary Systems Containing Mesitylene  

Directory of Open Access Journals (Sweden)

Full Text Available This paper presents a review of density measurements for binary systems containing 1,3,5-trimethylbenzene (mesitylene with a variety of organic compounds at atmospheric pressure. Literature data of the binary systems were divided into nine basic groups by the type of contained organic compound with mesitylene. The excess molar volumes calculated from the experimental density values have been compared with literature data. Densities were measured by a few experimental methods, namely using a pycnometer, a dilatometer or a commercial apparatus. The overview of the experimental data and shape of the excess molar volume curve versus mole fraction is presented in this paper. The excess molar volumes were correlated by Redlich–Kister equation. The standard deviations for fitting of excess molar volume versus mole fraction are compared. Found literature data cover a huge temperature range from (288.15 to 343.15 K.

Morávková, L.

2013-05-01

186

A novel technique for inferior rectus recession  

Directory of Open Access Journals (Sweden)

Full Text Available Birsen Gokyigit, Serpil Akar, Omer Faruk YilmazDepartment of Strabismus, Istanbul Beyoglu Educational and Research Eye Hospital, Istanbul, TurkeyPurpose: To introduce a novel technique of inferior rectus recession operation to allow larger amounts of recession without causing lower lid retraction and to compare this method with the results obtained in standard inferior rectus recession.Material and methods: This study included 20 patients operated on in the authors' clinic. The median age of the patients was 24.5±18.6 (4–73 years and the median follow-up was 9.3±11.8 (3–43 months. Ten patients operated on with the standard method were labeled Group 1 and ten patients operated on with the new method were labeled Group 2. Without exceeding 4 mm, inferior rectus recession to the whole muscle was performed in Group 1 patients. Inferior rectus recession was also performed on patients in Group 2 following the new method. Using a spatula, approximately 10% of the muscle surface fibers were detached intact as a thin layer, and the remaining 90% of deeper fibers were recessed 4–8 mm as planned. Patients' preoperative deviations and lower lid positions were recorded. The same parameters were checked in the first and third month postoperatively. Both groups were evaluated retrospectively by screening their files, and the Mann–Whitney U test was used for statistical evaluation.Results: Lower lid retraction was seen in four patients of Group 1. There was no retraction in Group 2. While there was a need to perform additional vertical muscle procedures for vertical deviations and lower lid retractions in Group 1, it was observed that there was no need for additional procedures in Group 2 patients. There was a statistically meaningful difference between the two procedures (P<0.05.Conclusion: This novel technique was found to be an effective surgical method for permitting more recession without the risk of lower lid retraction.Keywords: inferior rectus recession, lower lid retraction, ophthalmologic surgical procedures

Gokyigit B

2014-01-01

187

Management of a partial molar pregnancy: a case study report.  

Science.gov (United States)

Partial molar pregnancy with coexisting fetus is a rare complication of pregnancy and carries significant risks to both the mother and the fetus. Maternal risks include abnormal bleeding and the development of preeclampsia. The fetus frequently develops abnormally, often due to abnormal karyotype. This case presents a woman with a partial molar pregnancy with coexisting fetus, including diagnosis, plan of care, and delivery information. PMID:19474581

Drummond, Susan; Fritz, Elizabeth

2009-01-01

188

Inflammatory root resorption in primary molars: prevalence and associated factors  

OpenAIRE

This study aimed at determining the prevalence of inflammatory root resorption and associated factors in 1068 primary mandibular molars in 453 children 3 to 12 years of age. Age, dental history and medical history were recorded using a questionnaire administered to the children's parents/caregivers. Previously trained and calibrated examiners assessed radiographic images of the primary molars by direct observation, with the aid of a viewing box. Root resorption (physiological or inflammatory)...

Raquel Gonçalves Vieira-Andrade; Clarissa Lopes Drumond; Laura Pereira Azevedo Alves; Leandro Silva Marques; Maria Letícia Ramos-Jorge

2012-01-01

189

Inferior sinus venosus defects: anatomic features and echocardiographic correlates.  

Science.gov (United States)

Inferior sinus venosus defects (SVDs) are rare imperfections located in the inferior portion of the atrial septum, leading to an overriding inferior vena cava (IVC) and an interatrial connection. These defects have increased risk of anomalous pulmonary venous return (PAPVR) and often are confused with secundum atrial septal defects (ASDs) with inferior extension. The authors sought to review their experience with inferior SVDs and to establish at their institution an echocardiographic definition that differentiates inferior SVDs from secundum ASDs with inferior extension. The study identified 161 patients 1.5 to 32 years of age who had undergone repair of a secundum ASD with inferior extension or inferior SVD over the preceding 10 years. All surgical notes, preoperative transthoracic echocardiograms (TTEs), and preoperative transesophageal echocardiograms (TEEs) were reviewed. Based on the surgical notes, 147 patients were classified as having a secundum ASD (147/161, 91 %) and 14 patients (9 %) as having an inferior SVD. The study identified PAPVR in 7 % (1/14) of the patients with inferior SVDs and 3.5 % (5/14) of the patients with secundum ASDs. Surgical diagnosis and preoperative TTE correlated for 143 (89 %) of the 161 patients. Using a strict anatomic and echocardiographic definition with a blinded observer, the majority of the defects (14/18, 78 %) were reclassified correctly after review of their TTE images, and 100 % of the defects were correctly reclassified after TEE image review. Accurate diagnosis of inferior SVDs remains challenging. The data from this study demonstrate that use of a strict anatomic and echocardiographic definition (a defect that originates in the mouth of the IVC and continues into the inferoposterior border of the left atrium, leaving no residual atrial septal tissue at the inferior margin) allows for accurate differentiation between secundum ASDs with inferior extension and inferior SVDs. This differentiation is extremely important in planning for surgical versus device closure of these rare defects. PMID:22854830

Plymale, Jennifer; Kolinski, Kellen; Frommelt, Peter; Bartz, Peter; Tweddell, James; Earing, Michael G

2013-02-01

190

Outcome of molar pregnancies in Malaysia: a tertiary centre experience.  

Science.gov (United States)

Gestational trophoblastic disease (GTD) is a common problem among Asian ethnics. A total of 102 women with molar pregnancies between 1 January 2005 and 31 December 2010, were analysed. The aim of the study was to determine the outcome of all molar pregnancies in our institution. The local incidence of molar pregnancy was 2.6 per 1,000 deliveries. A total of 48 women (47.1%) had complete hydatidiform mole and another 54 (52.9%) had partial mole. The mean age of the women with molar pregnancies was 32.0 ± 7.9 years. The mean gestational age at initial diagnosis was 11 weeks ± 3 days. The majority (97 women, 95.1%) had symptoms of vaginal bleeding and 18 (17.6%) women had a uterus larger than dates. A total of 48 (47.1%) women had ultrasound scan findings of 'snow-storm' appearance. None of the women with uncomplicated molar pregnancy had evidence of relapse following one undetectable serum ?-hCG level. Four out of the 102 women (3.9%) developed persistent trophoblastic disease before attaining one undetectable serum ?-hCG level. All four women required single agent methotrexate and they remained in remission. The prognosis for uncomplicated molar pregnancy is good. Establishment of a National Trophoblastic Centre is recommended to maintain optimal outcome. PMID:23445147

Nirmala, C K; Nor Azlin, M I; Harry, S R; Lim, P S; Shafiee, M N; Nur Azurah, A G; Omar, M H; Hatta, M D

2013-02-01

191

Standard molar enthalpies of formation of 3'- and 4'-nitroacetophenones  

International Nuclear Information System (INIS)

Research highlights: ? The standard molar enthalpies of formation, in the condensed phase, of 3'- and 4'-nitroacetophenones have been determined by combustion calorimetry. ? The vapor pressures of the crystalline 3'- and 4'-nitroacetophenones were measured as function of temperature by the Knudsen effusion mass loss technique. ? The standard molar enthalpies, entropies and Gibbs functions of sublimation, at T = 298.15 K, were calculated for both compounds. - Abstract: The standard (po = 0.1 MPa) molar enthalpies of formation, in the condensed phase, of 3'- and 4'-nitroacetophenones, presented in this work, were obtained from measurements of their combustion energies, at T = 298.15 K, using a static bomb calorimeter. The vapor pressures of the two crystalline 3'- and 4'-nitroacetophenones were measured as a function of temperature by the Knudsen effusion mass loss technique. The standard molar enthalpies of sublimation, at T = 298.15 K, were derived from the Clausius-Clapeyron equation. The standard molar enthalpies, entropies, and Gibbs functions of sublimation, at T = 298.15 K, were calculated for the two compounds. The experimental values obtained were used to calculate the standard molar enthalpies of formation of 3'- and 4'-nitroacetophenones, in the gaseous phase, as ?fHm0(g)=-(99.4±1.6)kJ·mol-1 and ?fHm0(g)=-(99.1±1.7)kJ·mol-1, respectively, and these dup>, respectively, and these derived values are analyzed in terms of structural enthalpic increments.

192

Molar exergy and flow exergy of pure chemical fuels  

International Nuclear Information System (INIS)

Expressions of the molar exergy and of the molar flow exergy of a pure chemical fuel are deduced rigorously from the basic principles of thermodynamics. It is shown that molar exergy and molar flow exergy coincide when the temperature T and the pressure p of the fuel are equal to the temperature TB and the pressure pB of the environment; a general relation between exergy and flow exergy is proved as a consequence. The deduction of the expression of the molar exergy of a chemical fuel for non-standard values of TB and pB is clarified. For hydrogen, carbon dioxide and several hydrocarbons, tables are reported to allow a simple calculation of the molar exergy of the fuel for any value of the temperature TB and the relative humidity ?B of the environment, in the range 268.15 K ? TB ? 313.15 K and 0.1 ? ?B ? 1, with reference to the standard atmospheric pressure. Additional tables are provided to evaluate the difference between the exergy or the flow exergy of the fuel in its given initial state and the exergy at T = TB and p = pB. In these tables, it is assumed that fuel and environment have the same temperature and that the fuel pressure varies in the range 1.01325 bar ? p ? 200 bar; the fuel may be gas or liquid.

193

Prevalence of Taurodont molars in a North Indian population  

Science.gov (United States)

Background: It is very important for dentists to be familiar with anomalies of teeth not only for the clinical complications but also their management. Taurodontism also provides a valuable clue in detecting its association with various syndromes and other systemic conditions. The purpose of this study was to assess the prevalence of Taurodont molars among a North Indian population. Materials and Methods: A total of 1000 patients’ full-mouth periapical radiographs were screened. The radiographs were evaluated under optimal conditions using double magnifying glasses. A total of 7615 molars (including third molars) were evaluated. The relative incidence and the correlations regarding the location of Taurodont teeth (right versus left side and maxillary versus mandibular) were analyzed using the Chi-square test. Results: Twenty-eight patients were found to have a Taurodont molar (11 women and 17 men [P = 0.250]). The prevalence of Taurodont molar was 2.8%. Males had a higher prevalence rate than females (3.4% vs. 2.2%, respectively). A cluster analysis of total Taurodonts in the mandible (45%) versus maxilla (55%) of both males and females combined showed a statistically significant difference (P < 0.05). Conclusion: The occurrence of Taurodontism is basically based on racial expression in different populations. These variations in prevalence between different populations may be due to ethnic variations. The occurrence of Taurodont molars among this Indian population was rare. PMID:25767357

Bharti, Ramesh; Chandra, Anil; Tikku, Aseem Prakash; Arya, Deeksha

2015-01-01

194

Standard molar enthalpy of formation of methoxyacetophenone isomers  

International Nuclear Information System (INIS)

Highlights: • Experimental and computational energetic study of methoxyacetophenone isomers. • Enthalpies of formation and phase transition determined by calorimetric techniques. • Quantum chemical calculations allowed estimation of enthalpies of formation. • Structure and energy correlations were established. - Abstract: Values of the standard (po = 0.1 MPa) molar enthalpy of formation of 2?-, 3?- and 4?-methoxyacetophenones were derived from their standard molar energy of combustion, in oxygen, at T = 298.15 K, measured by static bomb combustion calorimetry. The Calvet high temperature vacuum sublimation technique was used to measure the enthalpies of sublimation/vaporization of the compounds studied. The standard molar enthalpies of formation of the three compounds, in the gaseous phase, at T = 298.15 K, have been derived from the corresponding standard molar enthalpies of formation in the condensed phase and the standard molar enthalpies for the phase transition. The results obtained are ?(232.0 ± 2.5), ?(237.7 ± 2.7) and ?(241.1 ± 2.1) kJ · mol?1 for 2?-, 3?- and 4?-methoxyacetophenone, respectively. Standard molar enthalpies of formation were also estimated from different methodologies: the Cox scheme as well as two different computational approaches using density functional theory-based B3LYP and the multilevel G3 methodologies

195

A bracket design proposal for the first molar  

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Full Text Available Introduction: The advent of bracket bonding simplified the assembly of orthodontic braces, besides giving more comfort to the patient and decreasing the risk of decalcification. However, there is no first molar bracket with accessory tube and hooks in the market, except for the convertible type.Objective:To present a patent for utility model of a bracket Roth prescription, Straight-Wire technique for first molar, in order to facilitate orthodontic treatment where there is a need for placing accessories in second molars.Material and methods:This patent consists of a molar bracket for bonding, which contains a retentive base for this, similar to the bracket used in the Edgewise technique,with fins for placing alastic or metal ligature,but containing pre-angles and torques as the tubes of the molar Straight-Wire technique with Roth prescription.It also includes an accessory tube for placing arches or cantilevers and hooks for placing elastics.Results and conclusion:With this bracket design proposal it is possible to obtain an accessory that facilitates the inclusion of the second molar in the assembly of the orthodontic brace without the use of bands.Moreover, this bracket has fins for placing ligatures,accessory tube for placing arches or cantilevers and hooks for placing elastics.

Roberto Scalon

2010-07-01

196

Relación entre Niveles de Inclusión de Terceros Molares Mandibulares e Índices Antropométricos Físicos de la Mandíbula en Etnias Atacameñas y Aymaras del Norte de Chile / Relationship between Levels of Third Molar Inclusion and Physical Anthropometric Indices of the Mandible in the Atacameño and Aymara Ethnic Groups of Northern Chile  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: Spanish Abstract in spanish La patología relacionada con el proceso de formación odontogénica, desarrollo y erupción de terceros molares, constituyen uno de los motivos más frecuentes de consulta odontológica. La mayoría de los autores coinciden en que el tercer molar inferior es el diente con mayor frecuencia de inclusión per [...] o existen discrepancias respecto a la influencia de factores ecológicos y raciales que expliquen esa condición. Se sabe que los individuos de un grupo étnico tienen características físicas especiales y esto también se observa a nivel facial de acuerdo a las características del macizo máxilo-mandibular. Esto motivó investigar la relación entre niveles de inclusión de terceros molares mandibulares e índices antropométricos físicos de la mandíbula en grupos étnicos atacameños y aymaras del norte de Chile. De esta población se estableció una muestra de 56 pacientes para la determinación de grupos sanguíneos y factor Rh y establecer el grado de mestizaje. Asimismo se efectuó un examen clínico intra-oral para precisar el estado de erupción o ausencia de terceros molares inferiores y se tomaron ortopantomografías para determinar el estado de inclusión o agenesia de los dientes no visibles en la cavidad oral, a través de la clasificación de profundidad respecto del límite amelo-cementario del segundo molar presente. Finalmente, se procedió a registrar diferentes medidas del macizo máxilo-facial para establecer los índices de la rama bilateral e índice cigo-mandibular en cada uno de los individuos seleccionados. El estudio compara sus resultados con otras investigaciones y pudo determinar en ambas poblaciones indígenas la prevalencia de terceros molares inferiores (85,72% derecha y 83,93% izquierda). Abstract in english The pathology associated with the formation, development and eruption of third molars is one of the most frequent reasons for dental consults. Several authors agree that the third molar is the most frequent inclusion tooth, there is however, disagreement about the influence of environmental and raci [...] al factors that explain this condition. It is known that individuals of one ethnic group have particular physical characteristics, which are also observed at facial level according to characteristics of maxillo-mandibular mass. This prompted research regarding the relationship between levels of third molar inclusion and physical anthropometric indices of the mandible in Atacameño and Aymara ethnic groups in Northern Chile. A sample of 56 patients to determine blood type and Rh factor was established to assess the degree of mixing. An intra-oral clinical examination was also performed to clarify the state of eruption or absence of third molars. Radiographs were taken to determine the inclusion or agenesis if teeth were not visible in the oral cavity, through classification of depth on cementum-enamel boundary of the second molar present. Finally we proceeded to record various measurements of maxillo-facial massif to set the bilateral mandibular ramus and ziggo mandibular indexes in each of the selected individuals. The study compares results with other research and determined in both indigenous populations, the prevalence of third molars (85.72% right, and 83.93% left).

Víctor Javier, Beltrán Varas; Ramón, Fuentes Fernández; Alejandro, Bustos Cortés; Antonio, Sanhueza Campos.

2011-06-01

197

Molars extraction for bone graft study in rabbits Extração de molares para estudos de enxertos ósseos em coelhos  

OpenAIRE

PURPOSE: The aim of this study was to describe an experimental surgical technique to be used in the evaluation of bone grafts in rabbits. METHODS: The operative technique was performed in jaws, with external approach from the labial commissure to the last molar tooth. An incision about 1cm extended forward to the alveolar ridge, followed by a exposing the cervical region of the alveolar bone and dental elements was done. Thus, after extraction of first molar with forceps, the tooth socket lef...

José Eduardo Ferreira Manso; Carlos Fernando de Almeida Barros Mourão; Flávio Alexandre Lima Pinheiro; Manoel Luiz Ferreira; Paulo César Silva; Alberto Schanaider

2011-01-01

198

Morphological changes related to age in mesial root canals of permanent mandibular first molars  

Scientific Electronic Library Online (English)

Full Text Available SciELO Argentina | Language: English Abstract in portuguese O objetivo do presente estudo foi avaliar as alteracoes morfologicas relacionadas com a idade em canais radiculares mesial de primeiros molares inferiores. Cinquenta e seis especimes foram selecionados para este estudo. Os especimes foram distribuidos em quatro grupos etarios (n. 14): a) Grupo de cr [...] iancas menores de 13 anos, b) grupo de adolescentes (de 14 a 19 anos), c) Grupo de jovens adultos (de 20 a 39 anos ) e d) Grupo de adultos (acima de 40 anos). Apos as extracoes os elementos foram cuidadosamente limpos, esterilizados, identificadas e armazenadas em agua. A fim de melhorar a limpeza, foram colocados numa solucao de hipoclorito de sodio a 1%, durante quatro horas e enxaguados em 10 vol. peroxido de hidrogenio durante 8 horas. Depois, uma tecnica de diafanizacao foi realizada para ilustrar a anatomia do canal radicular. As imagens digitalizadas de todas as amostras foram obtidas atraves da utilizacao de um estereoscopio. Os canais foram visivelmente mais simples em adultos mais velhos: eles foram bem definidas e estreito, por vezes, demasiado estreito. Nucleo de calcificacao nao foi encontrado e havia apenas alguns restos de espacos internucleares. O sistema de canal apareceu mais limpa, mais clara e mais bem definida do que nas outras faixas etarias. Pode-se concluir que ha uma correlacao entre as alteracoes do envelhecimento e morfologicas nos canais radiculares mesial de primeiros molares inferiores. Abstract in english The aim of this study was to evaluate age-related morphological canal changes in mesial root canals of mandibular first molars of known ages. Fifty-six specimens were selected for this study and distributed into the following four age groups (n. 14): a) Group of children under 13 years, b) Group of [...] adolescents (from 14 to 19 years), c) Group of young adults (from 20 to 39 years) and d) Group of older adults (over 40 years). The specimens were in perfect condition because after extraction they were carefully cleaned, sterilized, identified and stored in water. In order to improve the cleaning, they were placed in 1% sodium hypochlorite solution for four hours and rinsed in 10 vol. hydrogen peroxide for 8 hours. After that, a clearing technique was performed to illustrate root canal anatomy. Digitalized images of all samples were obtained by use of a stereomicroscope. Canals were noticeably simpler in older adults: they were sharply defined and narrow, sometimes too narrow. Calcification nuclei were not found and there were only a few remains of internuclear spaces. The canal system appeared cleaner, clearer and more sharply defined than in the other age groups. It may be concluded that there is a correlation between aging and morphological changes in the mesial root canals of mandibular first molars.

Omar A, Gani; Claudio F, Boiero; Carolina, Correa; Ivana, Masin; Ricardo, Machado; Emmanuel JNL, Silva; Luiz Pascoal, Vansan.

2014-12-01

199

Molars extraction for bone graft study in rabbits / Extração de molares para estudos de enxertos ósseos em coelhos  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese OBJETIVO: Descrever uma técnica cirúrgica em coelhos para avaliação de enxertos ósseos. MÉTODOS: A técnica operatória consiste numa incisão na topografia da comissura labial até o ultimo molar. Uma incisão de 1cm no rebordo para expor o osso alveolar e a região cervical dos molares. Realizou-se a ex [...] odontia com fórceps e o alvéolo é preenchido com hidroxiapatita. Após o tempo de cicatrização é realizada a avaliação histológica. RESULTADOS: A análise histológica mostrou o novo osso formado rodeando biomaterial. CONCLUSÃO: O modelo cirúrgico para avaliação de enxertos ósseos utilizando molares de coelhos se mostrou factível. Abstract in english PURPOSE: The aim of this study was to describe an experimental surgical technique to be used in the evaluation of bone grafts in rabbits. METHODS: The operative technique was performed in jaws, with external approach from the labial commissure to the last molar tooth. An incision about 1cm extended [...] forward to the alveolar ridge, followed by a exposing the cervical region of the alveolar bone and dental elements was done. Thus, after extraction of first molar with forceps, the tooth socket left was filled with hydroxyapatite. The bone gain was analyzed by histopathological studies. RESULTS: The histological analyses indicated formed bone surrounding the biomaterial. CONCLUSION: The experimental model using the tooth socket of the rabbit molar is a feasible procedure for studies of bone grafts.

José Eduardo Ferreira, Manso; Carlos Fernando de Almeida Barros, Mourão; Flávio Alexandre Lima, Pinheiro; Manoel Luiz, Ferreira; Paulo César, Silva; Alberto, Schanaider.

200

Molars extraction for bone graft study in rabbits Extração de molares para estudos de enxertos ósseos em coelhos  

Directory of Open Access Journals (Sweden)

Full Text Available PURPOSE: The aim of this study was to describe an experimental surgical technique to be used in the evaluation of bone grafts in rabbits. METHODS: The operative technique was performed in jaws, with external approach from the labial commissure to the last molar tooth. An incision about 1cm extended forward to the alveolar ridge, followed by a exposing the cervical region of the alveolar bone and dental elements was done. Thus, after extraction of first molar with forceps, the tooth socket left was filled with hydroxyapatite. The bone gain was analyzed by histopathological studies. RESULTS: The histological analyses indicated formed bone surrounding the biomaterial. CONCLUSION: The experimental model using the tooth socket of the rabbit molar is a feasible procedure for studies of bone grafts.OBJETIVO: Descrever uma técnica cirúrgica em coelhos para avaliação de enxertos ósseos. MÉTODOS: A técnica operatória consiste numa incisão na topografia da comissura labial até o ultimo molar. Uma incisão de 1cm no rebordo para expor o osso alveolar e a região cervical dos molares. Realizou-se a exodontia com fórceps e o alvéolo é preenchido com hidroxiapatita. Após o tempo de cicatrização é realizada a avaliação histológica. RESULTADOS: A análise histológica mostrou o novo osso formado rodeando biomaterial. CONCLUSÃO: O modelo cirúrgico para avaliação de enxertos ósseos utilizando molares de coelhos se mostrou factível.

José Eduardo Ferreira Manso

2011-01-01

201

The inferior hypogastric plexus: a different view.  

Science.gov (United States)

The morphology of the inferior hypogastric plexus has been demonstrated in a series of dissections of nulliparous cadavers. Each cadaver was embalmed in a solution containing a significant proportion of methanol which preserved the pliability of the tissues enabling the nerve plexi to be clearly demonstrated. These structures are not normally encountered during general gynaecological surgery and clinicians are often unaware of the possible consequences of injury during vaginal delivery or sustained constipation. Denervation of pelvic organs, with subsequent reinnervation over the medium term, may account for a variety of obstetric and gynaecological syndromes. PMID:17454456

Spackman, R; Wrigley, B; Roberts, A; Quinn, M

2007-02-01

202

Prevalence of missing and impacted third molars in adults aged 25 years and above  

Energy Technology Data Exchange (ETDEWEB)

The purpose of this study was to determine the prevalence of missing and impacted third molars in people aged 25 years and above. The study sample of 3,799 patients was chosen randomly from patients who visited Pusan National University Dental Hospital and had panoramic radiographs taken. The data collected included presence and impaction state, angulation, and depth of impaction of third molars, and radiographically detected lesions of third molars and adjacent second molars. A greater percentage of men than women retained at least one third molar. The incidence of third molars decreased with increasing age. The incidence of partially impacted third molars greatly declined after the age of 30. Vertically impacted maxillary third molars and horizontally impacted mandibular third molars were most frequent in all age groups. Among the maxillary third molars, those impacted below the cervical line of the second molar were most frequent in all age groups, and among the mandibular third molars, deeply impacted third molars were most frequent in those aged over 40. Dental caries was the most common radiographic lesion of the third molars. Mesioangularly impacted third molars showed radiographic lesions in 13 (9.5%) adjacent maxillary second molars and 117 (27.4%) mandibular second molars. The number of remaining third molars decreased and the percentage of Class C depth increased with age. Caries was the most frequent lesion in third molars. Partially impacted mesioangular third molars showed a high incidence of caries or periodontal bone loss of the adjacent second molar. Regular oral examination will be essential to keep asymptomatic third molars in good health.

Jung, Yun Hoa; Cho, Bong Hae [Dept. of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University, Yansan (Korea, Republic of)

2013-12-15

203

Prevalence of missing and impacted third molars in adults aged 25 years and above  

International Nuclear Information System (INIS)

The purpose of this study was to determine the prevalence of missing and impacted third molars in people aged 25 years and above. The study sample of 3,799 patients was chosen randomly from patients who visited Pusan National University Dental Hospital and had panoramic radiographs taken. The data collected included presence and impaction state, angulation, and depth of impaction of third molars, and radiographically detected lesions of third molars and adjacent second molars. A greater percentage of men than women retained at least one third molar. The incidence of third molars decreased with increasing age. The incidence of partially impacted third molars greatly declined after the age of 30. Vertically impacted maxillary third molars and horizontally impacted mandibular third molars were most frequent in all age groups. Among the maxillary third molars, those impacted below the cervical line of the second molar were most frequent in all age groups, and among the mandibular third molars, deeply impacted third molars were most frequent in those aged over 40. Dental caries was the most common radiographic lesion of the third molars. Mesioangularly impacted third molars showed radiographic lesions in 13 (9.5%) adjacent maxillary second molars and 117 (27.4%) mandibular second molars. The number of remaining third molars decreased and the percentage of Class C depth increased with age. Caries was the most frequent lesion in third molars. Partially impacted mesioangular third molars showed a high incidence of caries or periodontal bone loss of the adjacent second molar. Regular oral examination will be essential to keep asymptomatic third molars in good health.

204

Estudo in vitro da resistência ao cisalhamento da colagem direta de tubos ortodônticos em molares / In vitro study of shear bond strength in direct bonding of orthodontic molar tubes  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Languages: English, Portuguese Abstract in portuguese INTRODUÇÃO: apesar da colagem direta despender menor tempo clínico, com maior preservação da integridade gengival, ainda hoje se observa uma alta incidência de bandagem dos molares. Portanto, torna-se interessante a idealização de recursos para o aumento da eficiência desse procedimento para dentes [...] submetidos a maiores impactos mastigatórios, como, por exemplo, os molares. OBJETIVO: esse estudo teve o propósito de avaliar se a resistência à adesão com a aplicação de uma camada de resina adicional na região oclusal da interface tubo/dente aumenta a qualidade do procedimento de colagem direta de tubos em molares. MÉTODOS: selecionou-se uma amostra composta por 40 terceiros molares inferiores, que foram aleatoriamente divididos em 2 grupos: Grupo 1 - colagem direta convencional, seguida pela aplicação de uma camada de resina na oclusal da interface tubo/dente; e Grupo 2 - colagem direta convencional. O teste de resistência ao cisalhamento foi realizado 24 horas após a colagem, utilizando-se uma máquina de ensaio universal, operando a uma velocidade de 0,5mm/min. Os resultados foram analisados por meio do teste t independente. RESULTADOS: os valores médios obtidos nos testes de cisalhamento foram: 17,08MPa para o Grupo 1 e 12,60MPa para o Grupo 2. O Grupo 1 apresentou uma resistência ao cisalhamento estatisticamente significativa mais alta do que o Grupo 2. CONCLUSÃO: a aplicação de uma camada adicional de resina na oclusal da interface tubo/dente aumenta a qualidade da adesão do procedimento de colagem direta de tubos ortodônticos em molares. Abstract in english OBJECTIVE: Although direct bonding takes up less clinical time and ensures increased preservation of gingival health, the banding of molar teeth is still widespread nowadays. It would therefore be convenient to devise methods capable of increasing the efficiency of this procedure, notably for teeth [...] subjected to substantial masticatory impact, such as molars. This study was conducted with the purpose of evaluating whether direct bonding would benefit from the application of an additional layer of resin to the occlusal surfaces of the tube/tooth interface. METHODS: A sample of 40 mandibular third molars was selected and randomly divided into two groups: Group 1 - Conventional direct bonding, followed by the application of a layer of resin to the occlusal surfaces of the tube/ tooth interface, and Group 2 - Conventional direct bonding. Shear bond strength was tested 24 hours after bonding with the aid of a universal testing machine operating at a speed of 0.5mm/min. The results were analyzed using the independent t-test. RESULTS: The shear bond strength tests yielded the following mean values: 17.08 MPa for Group 1 and 12.60 MPa for Group 2. Group 1 showed higher statistically significant shear bond strength than Group 2. CONCLUSIONS: The application of an additional layer of resin to the occlusal surfaces of the tube/tooth interface was found to enhance bond strength quality of orthodontic buccal tubes bonded directly to molar teeth.

Célia Regina Maio Pinzan, Vercelino; Arnaldo, Pinzan; Júlio de Araújo, Gurgel; Fausto Silva, Bramante; Luciana Maio, Pinzan.

2011-06-01

205

Orthodontic band retention on primary molar stainless steel crowns.  

Science.gov (United States)

The retention of orthodontic bands cemented on primary molar stainless steel crowns (SSC) was studied in vitro. Unitek maxillary and mandibular 1st and 2nd primary molar SSC were fitted with one of four commonly used orthodontic bands (Unitek regular, Unitek narrow, Rocky Mountain, or custom bands made from SSC) using glass ionomer cement. The cemented samples were tested for their resistance to dislodgment on the Instron Universal Testing Machine (Instron Engineering Corp., Canton, MA) in tensile mode. Alpha level for statistical significance was set at alpha = 0.05. Unitek regular bands cemented on the 2nd molar crowns and Unitek narrow bands cemented on the 1st molar crown samples had equivalent or superior resistance to dislodgment compared with the other bands in the study. When the inside of the band and the outside band-bearing surfaces of selected crowns were lightly scored with a diamond bur prior to cementation, samples exhibited significantly superior retention. Subgroup means increased from 107 to 330%, compared to the values obtained in their preroughened state. The mean values obtained using the roughened band/crown interface technique (range 52.9 +/- 7.6 to 73.6 +/- 8.4 lbs) compared favorably with retention values from the literature for orthodontic bands cemented on permanent molar and premolar teeth. PMID:8153003

Beemer, R L; Ferracane, J L; Howard, H E

1993-01-01

206

Uterine rupture following incomplete molar pregnancy: a case report  

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Full Text Available Background: In molar pregnancy, when hydatidiform changes are local and some embryonic components are observed, the term of partial mole is used. The risk of persistent trophoblastic tumor after partial mole is much lower than complete mole. In this persistent cases almost all are non metastatic. The aim of this study is to report a case of uterine rupture following incomplete molar pregnancy.Case presentation: The patient was a 26 year old woman with obstetric history of an abortion and one molar pregnancy and no child. She was referred to emergency unit in Ghaem University Hospital, Mashhad, Iran in May 2011. She had an evacuation curettage following molar pregnancy three months before and without any follow up visit. The patient was referred to emergency unit with hemorrhagic shock. She immediately underwent laparotomy. The uterine fundal rupture was repaired and evacuation curettage performed. In post operative evaluation, she had a nine millimeter metastatic nodule in base of right Lung. As a patient in low risk stage III, she received weekly intramuscular methotrexate (40mg/m2 for six courses. In follow up visit ?-hCG titer was negative (<10miu/ml at 5th week. Conclusion: In cases of in complete molar pregnancy risk of metastasis is very low. Serial beta-hCG titer is the most accurate method for detection of persistent gestational trophoblastic disease (GTN. In neglected cases like this case preservation of ruptured uterus in GTN is possible.

Pourali L

2013-03-01

207

Frequency of unerupted mandibular third molar in mandibular angle fractures  

International Nuclear Information System (INIS)

Background: Fractures of the mandibular angle are common and comprise 31% of all mandibular fractures. Multiple recent studies report a 2-3 fold increased risk for mandibular angle fractures when un-erupted mandibular third molars are present. The objective of this study was to assess the frequency of un-erupted mandibular third molar in mandibular angle fractures. Methods: This cross sectional study was conducted at the Department of Oral and Maxillofacial Surgery, Ayub Medical College, Abbottabad from April to October 2009. One hundred and two patients were included both from the outdoor and ward on consecutive non-probability sampling base. Data were recorded on a structured Performa and analysed using SPSS-16. Results: A hemi-mandible containing un-erupted mandibular third molar was seen to have a 1.41 times the risk of mandibular angle fracture then a hemi-mandible containing an erupted mandibular third molar. Conclusion: The presence of unerupted mandibular third molar is associated with an increased risk for mandibular angle fracture. (author)

208

An alternative approach to extruding a vertically impacted lower third molar using an orthodontic miniscrew: A case report with cone-beam CT follow-up  

Energy Technology Data Exchange (ETDEWEB)

One of the most common oral surgical procedures is the extraction of the lower third molar (LTM). Postoperative complications such as paresthesia due to inferior alveolar nerve (IAN) injury are commonly observed in cases of horizontal and vertical impaction. The present report discusses a case of a vertically impacted LTM associated with a dentigerous cyst. An intimate contact between the LTM roots and the mandibular canal was observed on a panoramic radiograph and confirmed with cone-beam computed tomographic (CBCT) cross-sectional cuts. An orthodontic miniscrew was then used to extrude the LTM prior to its surgical removal in order to avoid the risk of inferior alveolar nerve injury. CBCT imaging follow-up confirmed the success of the LTM orthodontic extrusion.

Cortes, Arthur Rodriguez Gonzales; Cavalcanti, Marcelo Gusmaeo Paraiso; Arita, Emiko Saito [Dept. of Oral Radiology, School of Dentistry, University of Saeo Paulo, Saeo Paulo (Brazil); No-Cortes, Julian [Orthodontic Clinic, Saeo Paulo (Brazil)

2014-06-15

209

An alternative approach to extruding a vertically impacted lower third molar using an orthodontic miniscrew: A case report with cone-beam CT follow-up  

International Nuclear Information System (INIS)

One of the most common oral surgical procedures is the extraction of the lower third molar (LTM). Postoperative complications such as paresthesia due to inferior alveolar nerve (IAN) injury are commonly observed in cases of horizontal and vertical impaction. The present report discusses a case of a vertically impacted LTM associated with a dentigerous cyst. An intimate contact between the LTM roots and the mandibular canal was observed on a panoramic radiograph and confirmed with cone-beam computed tomographic (CBCT) cross-sectional cuts. An orthodontic miniscrew was then used to extrude the LTM prior to its surgical removal in order to avoid the risk of inferior alveolar nerve injury. CBCT imaging follow-up confirmed the success of the LTM orthodontic extrusion.

210

Hepatocellular carcinomas supplied by inferior phrenic arteries  

International Nuclear Information System (INIS)

Purpose: To assess the arterial supply to hepatocellular carcinomas (HCCs) by inferior phrenic arteries (IPA). Material and Methods: A total of 126 consecutive cases of HCC were studied by contrast-enhanced CT and conventional arteriography. Blood supply from an IPA was suspected when the size of the HCC mass as seen on contrast-enhanced CT did not match the size of the tumor mass as seen on hepatic arteriography. Inferior phrenic arteriography was employed to confirm these findings. HCCs fed by the IPA were analyzed in terms of size, location, and history of prior treatment. Results: In 14 (11%) of the 126 cases, the tumor was found to have a blood supply from an IPA. Eleven of these tumors were located in segments 2 and 7. Three tumors, which had not been treated previously, had a blood supply from an IPA. Six tumors were almost exclusively fed by an IPA and were located in segments 7, 1, and 4. Conclusion: HCCs located in segments which form the bare area of the liver (S1, S2, S7) can be supplied by an IPA. This should be suspected when a lesion or part of a lesion is identified on contrast-enhanced CT but not on hepatic arteriography. (orig.)

211

Agenesia da veia cava inferior / Agenesis of the inferior vena cava  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Languages: English, Portuguese Abstract in portuguese Agenesia da veia cava inferior é uma malformação rara. Sua causa mais comum é a disgenesia durante a embriogênese, mas também pode estar relacionada a trombose intrauterina ou perinatal. Normalmente é assintomática, em associação, ou não, com outras malformações congênitas, e pode cursar com maior r [...] isco de insuficiência venosa crônica e trombose venosa profunda, especialmente em jovens. Seu diagnóstico frequentemente é acidental, durante cirurgias abdominais ou procedimentos radiológicos. Relatamos cinco casos de agenesia da veia cava inferior detectada durante procedimentos eletrofisiológicos. Abstract in english Agenesis of the inferior vena cava is a rare malformation. Its most common cause is dysgenesis during embryogenesis, but it may also be related to intrauterine or perinatal thrombosis. It is usually asymptomatic, associated or not with other congenital malformations and may be related to increased r [...] isk of chronic venous insufficiency and deep vein thrombosis, especially in young individuals. Diagnosis is often incidental, during abdominal surgery or radiological procedures. We reported five cases of agenesis of the inferior vena cava detected during electrophysiological procedures.

Caroline Saltz, Gensas; Leonardo Martins, Pires; Marcelo Lapa, Kruse; Tiago Luiz Luz, Leiria; Daniel Garcia, Gomes; Gustavo Glotz de, Lima.

2012-12-01

212

Parálisis traumática del recto inferior / Traumatic paralysis of the inferior rectus muscle  

Scientific Electronic Library Online (English)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish La parálisis constituye una interrupción completa de la acción muscular por afectación de la inervación responsable de la motilidad, a diferencia de la paresia, en la cual la afectación es parcial. La parálisis aislada del músculo recto inferior es clínicamente infrecuente caracterizada por hipertro [...] pía del ojo afectado que se acentúa a la abducción.El paciente presenta diplopía vertical que aumenta con la mirada hacia abajo sobre todo abajo y afuera, puede presentar tortícolis, lo que hace que se deprima el mentón. Es una entidad que no debemos olvidar en los traumatismo que afecten el piso de la órbita. Acude a consulta por presentar diplopía vertical de 7 meses de evolución. Al examen de motilidad ocular había una hipertropía de 15° x Hirshberg; 30 Dp base inferior por barra de prismas y marcada tortícolis con limitación en la depresión. El Test de fuerza generada mostró una ausencia de fuerza. Nuestra impresión diagnóstica fue parálisis traumática del músculo recto inferior derecho, por lesión directa. El tratamiento realizado fue la transposición total de los músculos rectos medial y recto lateral al músculo recto inferior derecho siguiendo la espiral de Tillaux horizontales con el objetivo de lograr el alineamiento de los ojos y eliminar la posición anómala de la cabeza, para lo cual se tiene en cuenta que la parálisis prolongada del recto inferior puede provocar contractura del recto superior ipsilateral, aspecto este que limita la depresión no solo en abducción sino también en aducción. Abstract in english Paralysis represents a complete interruption of muscular action due to problems in enervation in charge of motility, unlike paresia in which the effect is partial. The isolated inferior rectus muscle paralysis is infrequent and is characterized by the affected eye hypertropia that increases in abduc [...] tion. The patient presents vertical diplopia that increases when he looks down and out, he can also suffer torticollis which depresses his chin. This is a disease that must not be ignored in patients with orbit floor traumatism. A patient went to see the doctor with vertical diplopia for 7 months. The ocular motility exam disclosed 15 ° × Hirshberg hypertrophy, 30 Dp inferior base by prism bar and marked torticollis with restricted depression. The definitive diagnosis was a traumatic paralysis of the right inferior rectus muscle due to a direct lesion. The treatment was total transposition of the medial and lateral rectus muscle to the right inferior rectus muscle following the Tillaux horizontal spiral, with the objective of reaching the eye's alignment and eliminating the anomalous position of the head. One kept in mind that the prolonged paralysis of the inferior rectus muscle may provoke contracture of the ipsilateral upper rectus, thus limiting the depression on abduction and adduction.

Rosa, Naranjo Fernández; Yaimir, Estévez Miranda; Teresita de Jesús, Méndez Sánchez; Alina, Pedroso Llanes.

2010-12-01

213

A NOVEL TREATMENT APPROACH FOR EXTRUDED MAXILLARY MOLAR  

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Full Text Available Two approaches are currently used to correct overerupted/extruded posterior teeth, the “prosthodontic” and the “orthodontic” one. This report presents a novel orthodontic approach for selective molar intrusion. In two females (26 and 20 years, a modified transpalatal arch (TPA, equivalent to a couple with a 30 g net force was used to move the tooth bodily. A 50 g force was applied to the overerupted maxillary second molar by means of a short length elastomeric chain from the helix to the palatal sheath and replaced every three weeks. Sufficient intrusion of the maxillary second molar was obtained within two months. For intrusion of a single tooth, a modified TPA together with a short length elastomeric chain is a non-invasive and cost-effective alternative to traditional edgewise mechanics, temporary anchorage devices, or removable appliances.

Julia Elodie Vlachojannis

2011-08-01

214

Análise oclusal de pacientes com má-oclusão de classe ii, tratados com extrações de 4 pré-molares  

Directory of Open Access Journals (Sweden)

Full Text Available Para determinar a estabilidade dos resultados oclusais, após tratamento ortodôntico, realizou-se um estudo comparativo do número de pontos de contato oclusais na posição de máxima intercuspidação habitual em uma amostra composta por 14 pacientes leucodermas, sendo 9 do sexo feminino e 5 do sexo masculino, com má-oclusão de Classe II, divisão 1a de Angle, tratados ortodonticamente com a técnica de Edgewise, e extração dos 4 primeiros pré-molares. Estes pontos foram registrados em dois tempos: T1 - ao final da fase de contenção superior e T2 - após um período médio de 5,2 anos. A contagem dos contatos oclusais foi realizada, separadamente, no arco superior e inferior, na região anterior e posterior. Depois da análise estatística, pôde-se concluir que não houve diferença estatisticamente significante entre o número médio de contatos oclusais nos diferentes períodos estudados.

Fernando Alcides José de Souza

2008-01-01

215

Molar enamel thickness and dentine horn height in Gigantopithecus blacki.  

Science.gov (United States)

Absolutely thick molar enamel is consistent with large body size estimates and dietary inferences about Gigantopithecus blacki, which focus on tough or fibrous vegetation. In this study, 10 G. blacki molars demonstrating various stages of attrition were imaged using high-resolution microtomography. Three-dimensional average enamel thickness and relative enamel thickness measurements were recorded on the least worn molars within the sample (n = 2). Seven molars were also virtually sectioned through the mesial cusps and two-dimensional enamel thickness and dentine horn height measurements were recorded. Gigantopithecus has the thickest enamel of any fossil or extant primate in terms of absolute thickness. Relative (size-scaled) measures of enamel thickness, however, support a thick characterization (i.e., not "hyper-thick"); G. blacki relative enamel thickness overlaps slightly with Pongo and completely with Homo. Gigantopithecus blacki dentine horns are relatively short, similar to (but shorter than) those of Pongo, which in turn are shorter than those of humans and African apes. Gigantopithecus blacki molar enamel (and to a lesser extent, that of Pongo pygmaeus) is distributed relatively evenly across the occlusal surface compared with the more complex distribution of enamel thickness in Homo sapiens. The combination of evenly distributed occlusal enamel and relatively short dentine horns in G. blacki results in a flat and low-cusped occlusal surface suitable to grinding tough or fibrous food objects. This suite of molar morphologies is also found to varying degrees in Pongo and Sivapithecus, but not in African apes and humans, and may be diagnostic of subfamily Ponginae. PMID:17941103

Olejniczak, A J; Smith, T M; Wang, W; Potts, R; Ciochon, R; Kullmer, O; Schrenk, F; Hublin, J-J

2008-01-01

216

Correlations between elastic moduli and molar volume in metallic glasses  

International Nuclear Information System (INIS)

We report clear correlations between bulk modulus (K) and average molar volume Vm, and between Poisson's ratio ? and Vm for various bulk metallic glasses. The origin for the correlations between elastic moduli and Vm are discussed. The established correlation, associated with Poisson's ratio ?, and since the ? correlates with plasticity of metallic glasses, indicates that the average molar volume is important factor to be considered for plastic metallic glasses searching. The found correlations also suggest a close relation between the mechanical properties and the short-range atomic bonding, and assist in understanding deformation behavior in metallic glasses

217

[Recurrent hydatidiform mole. Case report of 9 successive molar pregnancies].  

Science.gov (United States)

The recurrent hydatiform mole is rare, its frequency is lower to 1%. We report the observation of a 28 years old women. without antecedents of molar pregnancy in the family and without considerable pathological antecedents. She had 9 successive molar pregnancies, without inset normal pregnancies and without living children. The delay of at least 1 year between the gestations has been respected in 6 pregnancies. The etiologic balance in particular the caryotypes of parents is normal. The authors debate the étiopathogénic and prognostic factors of this pathology. PMID:17175694

Sahraoui, Wassila; Hajji, Saloua; Haouas, Noureddine; Ladib, Noura; Essafi, Adel; Hmissa, Sihem; Bibi, Mohamed; Khairi, Hedi

2006-08-01

218

Phase separation induced fractionation in molar mass in aqueous mixtures of gelatin and dextran  

OpenAIRE

An overview of the effects of phase separation of aqueous mixtures of gelatin and dextran on the fractionation in molar mass of these two components is given. Molar mass distributions in coexisting phases were investigated using size exclusion chromatography with multiangle laser light scattering. The initial molar mass of the native material, concentration, and temperature were varied. The results show a strong fractionation in molar mass for both components. The molar mass of the native mat...

Edelman, M. W.; Tromp, R. H.; Weenen, H.

2003-01-01

219

Forças de mordida relacionadas a próteses parciais removíveis inferiores / Biting forces related to partially removable mandibular dentures  

Scientific Electronic Library Online (English)

Full Text Available A pesquisa teve como objetivo determinar as forças de mordida de 73 indivíduos, por meio de um gnatodinamômetro. Os pacientes eram portadores de próteses parciais removíveis inferiores classes I, II ou III. A arcada antagonista era prótese, parcial removível ou fixa, ou total. Os resultados permitir [...] am concluir que: as selas de extremidade livre, principalmente em suas posições extremas, conduziram a forças de mordida muito baixas; o envolvimento de prótese total, também, conduziu a forças de mordida baixas; o sexo masculino alcançou valores maiores que o feminino; com prótese parcial removível classe III, os dentes naturais molares e pré-molares desenvolveram valores maiores do que com classes I e II. Abstract in english The purpose of this study was to determine the biting forces of individuals wearing classes I, II or III partially removable mandibular dentures. Upper jaws presented fixed bridges, classes I, II or III partially removable dentures, or complete dentures. Measurements of biting forces were obtained b [...] y a gnathodynamometer. The conclusions were: classes I and II presented low biting forces, specially far from the last abutment tooth; when the opposite arcade was a complete denture, biting forces were low; males presented higher biting forces than females; natural molars and bicuspids presented higher biting forces with class III than with classes I or II.

Eduardo Piza, PELLIZZER; Antonio, MUENCH.

1998-10-01

220

Forças de mordida relacionadas a próteses parciais removíveis inferiores Biting forces related to partially removable mandibular dentures  

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Full Text Available A pesquisa teve como objetivo determinar as forças de mordida de 73 indivíduos, por meio de um gnatodinamômetro. Os pacientes eram portadores de próteses parciais removíveis inferiores classes I, II ou III. A arcada antagonista era prótese, parcial removível ou fixa, ou total. Os resultados permitiram concluir que: as selas de extremidade livre, principalmente em suas posições extremas, conduziram a forças de mordida muito baixas; o envolvimento de prótese total, também, conduziu a forças de mordida baixas; o sexo masculino alcançou valores maiores que o feminino; com prótese parcial removível classe III, os dentes naturais molares e pré-molares desenvolveram valores maiores do que com classes I e II.The purpose of this study was to determine the biting forces of individuals wearing classes I, II or III partially removable mandibular dentures. Upper jaws presented fixed bridges, classes I, II or III partially removable dentures, or complete dentures. Measurements of biting forces were obtained by a gnathodynamometer. The conclusions were: classes I and II presented low biting forces, specially far from the last abutment tooth; when the opposite arcade was a complete denture, biting forces were low; males presented higher biting forces than females; natural molars and bicuspids presented higher biting forces with class III than with classes I or II.

Eduardo Piza PELLIZZER

1998-10-01

221

Percutaneous insertion of the inferior vena cava filter  

International Nuclear Information System (INIS)

Objective: To evaluate the effect of inferior vena cava filter for prevention of pulmonary embolus (PE) formation. Methods: Twenty-eight cases of deep venous thrombosis (DVT) were treated with insertion of the inferior vena cava filter. Results: The filter was implanted into inferior vena cava below the rena vein. There were no severe complications occurred in the group. Twenty-seven cases were followed up to 2-34 months, and no migration of the filters were found. And no pulmonary embolism were revealed in fifteen cases without pulmonary thromboembolism. Conclusions: The inferior vena cava filter implantation is a safe and effective method to prevent pulmonary thromboembolism

222

Congenital anomalies of the inferior vena cava  

International Nuclear Information System (INIS)

Congenital anomalies of the inferior vena cava (IVC) and its tributaries are increasingly recognized in asymptomatic patients due to the more frequent use of cross-sectional imaging and computed tomography (CT) in particular. IVC development is a complex process involving formation of anastomoses between three pairs of embryonic veins in the 4th to 8th week of gestation. Various permutations occur in the basic venous plan of the abdomen and pelvis resulting in variants such as isolated left IVC, double IVC, and retroaortic left renal vein. The majority of these anomalies are asymptomatic but occasionally present clinically with thromboembolic complications. However, awareness of their existence is important to avoid important diagnostic pitfalls and in preoperative surgical and interventional radiological planning.

223

Congenital anomalies of the inferior vena cava  

Energy Technology Data Exchange (ETDEWEB)

Congenital anomalies of the inferior vena cava (IVC) and its tributaries are increasingly recognized in asymptomatic patients due to the more frequent use of cross-sectional imaging and computed tomography (CT) in particular. IVC development is a complex process involving formation of anastomoses between three pairs of embryonic veins in the 4th to 8th week of gestation. Various permutations occur in the basic venous plan of the abdomen and pelvis resulting in variants such as isolated left IVC, double IVC, and retroaortic left renal vein. The majority of these anomalies are asymptomatic but occasionally present clinically with thromboembolic complications. However, awareness of their existence is important to avoid important diagnostic pitfalls and in preoperative surgical and interventional radiological planning.

Malaki, M., E-mail: mbmv@doctors.org.uk [Department of Clinical Radiology, Queen Elizabeth Hospital, Birmingham (United Kingdom); Willis, A.P.; Jones, R.G. [Department of Clinical Radiology, Queen Elizabeth Hospital, Birmingham (United Kingdom)

2012-02-15

224

Management of Six Root Canals in Mandibular First Molar  

Science.gov (United States)

Success in root canal treatment is achieved after thorough cleaning, shaping, and obturation of the root canal system. This clinical case describes conventional root canal treatment of an unusual mandibular first molar with six root canals. The prognosis for endodontic treatment in teeth with abnormal morphology is unfavorable if the clinician fails to recognize extra root canals. PMID:25685156

Gomes, Fabio de Almeida; Sousa, Bruno Carvalho

2015-01-01

225

[Caries of the first permanent molar in Ivory Coast children].  

Science.gov (United States)

The authors study dental decay in the first permanent molar among school children in Dimbokro (Côte d'Ivoire). The study, carried out on 1050 children aged between 7 to 16, revealed a low CAO index but a frequency index greater than 50%. PMID:2561686

Bakayoko-Ly, R; Toure, S H; Djaha, K; Adiko, E F; Kattie, A; Koffi, A; Brou, E; Egnankou, J K

1989-09-01

226

Efficacy of 5 machining instruments in scaling of molar furcations.  

Science.gov (United States)

The scaling efficacy of machining instruments was studied in the furcations of 100 extracted molars. The molars were divided into 5 groups with similar furcation anatomy, painted with artificial calculus, partly submerged in stone blocks, and the furcation entrances covered with a heavy rubber dam material. Ten mandibular and 10 maxillary molars were scaled by an experienced operator with each of the following instruments/inserts: ultrasonic instrument with either a prototype ball point insert or with a new pointed insert; ultrasonic instrument with a ball point insert; reciprocating hand-piece with new inserts for furcations; and a sonic scaler with a universal insert. The molar groups were coded and graded in a stereomicroscope by 2 independent examiners, and the rankings were tested with the Kruskal-Wallis test and the multiple comparisons between treatments test. The results revealed statistically significant differences between the instruments, as well as between different topographical areas of the furcations. The sonic scaler with a universal insert and the ultrasonic instrument with ball point inserts were significantly more efficient (P machining instruments for furcation cleaning as well as identifying the most difficult topographical areas to instrument. PMID:8463946

Takacs, V J; Lie, T; Perala, D G; Adams, D F

1993-03-01

227

Term Pregnancy with Partial Molar Changes of Placenta  

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Full Text Available A rare case report of successful term pregnancy with partial molar changes of placenta is beingreported. The patient was 2nd gravida with twin pregnancy with pregnancy induced hypertension(Pili. Patient under went LSCS and gave birth to two healthy looking babies. She was followed upand serum HCG (Human Chorinic Gouadotrophin level returned to normal within 4 weeks afterdelivery.

Amita Gupta,Yudhister Veer Gupta

2003-04-01

228

Extraction Timing of Heavily Destructed Upper First Permanent Molars  

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Full Text Available The first permanent molar as the first permanent tooth in the mouth and with a general insufficient oral hygiene of the children, is commonly subject to significant compromise which may arise due to caries or endodontic complication, or from developmental anomalies such as hypoplasia. Compromised teeth with questionable prognosis may result in short- and long-term clinical dilemmas. The aim of this research is to highlight the factors that require careful consideration when a compromised UFPM is detected and the importance of timely UFPM extraction to ensure the mesial drift of the upper second permanent molar (USPM to fulfill the space of the extracted UFPM without any orthodontic intervention. For this purpose 52 heavily destructed UFPMs were extracted at age of 10.5 years old, 44 (84.6% USPMs erupted exactly distal to the second premolar while only 7 (13.4% USPMs erupted 1 mm distal to the second premolar. Clinically it is recommended to extract the heavily destructed upper first molars at age of 10.5 years old to ensure the complete closure of the extraction space by the passive mesial drift of upper second permanent molar.

Ahmad A. Rahhal

2014-03-01

229

Variations in the mechanical properties of Alouatta palliata molar enamel.  

Science.gov (United States)

Teeth have provided insights into many topics including primate diet, paleobiology, and evolution, due to the fact that they are largely composed of inorganic materials and may remain intact long after an animal is deceased. Previous studies have reported that the mechanical properties, chemistry, and microstructure of human enamel vary with location. This study uses nanoindentation to map out the mechanical properties of Alouatta palliata molar enamel on an axial cross-section of an unworn permanent third molar, a worn permanent first molar, and a worn deciduous first molar. Variations were then correlated with changes in microstructure and chemistry using scanning electron microscopy and electron microprobe techniques. The hardness and Young's modulus varied with location throughout the cross-sections from the occlusal surface to the dentin-enamel junction (DEJ), from the buccal to lingual sides, and also from one tooth to another. These changes in mechanical properties correlated with changes in the organic content of the tooth, which was shown to increase from approximately 6% near the occlusal surface to approximately 20% just before the DEJ. Compared to human enamel, the Alouatta enamel showed similar microstructures, chemical constituents, and magnitudes of mechanical properties, but showed less variation in hardness and Young's modulus, despite the very different diet of this species. PMID:19672851

Darnell, Laura A; Teaford, Mark F; Livi, Kenneth J T; Weihs, Timothy P

2010-01-01

230

Term Pregnancy with Partial Molar Changes of Placenta  

OpenAIRE

A rare case report of successful term pregnancy with partial molar changes of placenta is beingreported. The patient was 2nd gravida with twin pregnancy with pregnancy induced hypertension(Pili). Patient under went LSCS and gave birth to two healthy looking babies. She was followed upand serum HCG (Human Chorinic Gouadotrophin) level returned to normal within 4 weeks afterdelivery.

Amita Gupta, Yudhister Veer Gupta

2003-01-01

231

Inflammatory root resorption in primary molars: prevalence and associated factors  

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Full Text Available This study aimed at determining the prevalence of inflammatory root resorption and associated factors in 1068 primary mandibular molars in 453 children 3 to 12 years of age. Age, dental history and medical history were recorded using a questionnaire administered to the children's parents/caregivers. Previously trained and calibrated examiners assessed radiographic images of the primary molars by direct observation, with the aid of a viewing box. Root resorption (physiological or inflammatory, dental crown status (healthy, carious with no pulp involvement, carious with pulp involvement and evidence of restoration, and pulpotomy or pulpectomy were determined. Data analysis involved descriptive statistics, the chi-square test and a multiple logistic regression (p < 0.05. The prevalence of inflammatory root resorption was 16.2% (n = 173. The male gender (OR: 1.4; 95% CI, the 3-to-7-years age bracket (OR: 1.5; 95% CI, an unhealthy dental crown (OR: 8.7; 95% CI, caries with pulp involvement (OR: 7.4; 95% CI, pulpotomy (OR: 3.1; 95% CI, and pulpectomy (OR: 5.4; 95% CI were risk factors for the occurrence of inflammatory root resorption in primary molars. In conclusion, the prevalence of inflammatory root resorption in the present sample was 16.2%. Gender, age, an unhealthy tooth, caries with pulp involvement, pulpotomy, pulpectomy, and the absence of a restoration were associated with a higher occurrence of inflammatory root resorption in primary molars.

Raquel Gonçalves Vieira-Andrade

2012-08-01

232

Miniscrew-supported coil spring for molar uprighting: description  

Scientific Electronic Library Online (English)

Full Text Available INTRODUÇÃO: desde o surgimento dos mini-implantes como recurso de ancoragem ortodôntica, muitas aplicações têm sido descritas na literatura. Entre essas, cita-se a verticalização de molares inclinados para mesial. No entanto, pouco se fala da correta aplicação das forças ortodônticas nesses disposit [...] ivos, sob o ponto de vista mecânico. OBJETIVOS: o objetivo desse artigo foi demonstrar uma mola mini-implante suportada para verticalizar molares inclinados para mesial. Com esse dispositivo consegue-se correta aplicação da mecânica ortodôntica, favorecendo movimentos mais previsíveis e minimizando os movimentos indesejáveis. Abstract in english INTRODUCTION: Since the beginning of miniscrews as orthodontic anchorage, many applications have been described in the literature. Among these, one is the uprighting of mesially inclined molars. In regard to the mechanical aspects, however, there is little information about the application of orthod [...] ontic forces using such devices. OBJECTIVE: The objective of this study was to describe a miniscrew supported spring for uprighting of mesially inclined molars. With this device, one can achieve the correct use of orthodontic biomechanics, thus favoring more predictable tooth movements and preventing unwanted movements from occurring.

Antônio Carlos de Oliveira, Ruellas; Matheus Melo, Pithon; Rogério Lacerda dos, Santos.

2013-02-01

233

Miniscrew-supported coil spring for molar uprighting: description  

Directory of Open Access Journals (Sweden)

Full Text Available INTRODUCTION: Since the beginning of miniscrews as orthodontic anchorage, many applications have been described in the literature. Among these, one is the uprighting of mesially inclined molars. In regard to the mechanical aspects, however, there is little information about the application of orthodontic forces using such devices. OBJECTIVE: The objective of this study was to describe a miniscrew supported spring for uprighting of mesially inclined molars. With this device, one can achieve the correct use of orthodontic biomechanics, thus favoring more predictable tooth movements and preventing unwanted movements from occurring.INTRODUÇÃO: desde o surgimento dos mini-implantes como recurso de ancoragem ortodôntica, muitas aplicações têm sido descritas na literatura. Entre essas, cita-se a verticalização de molares inclinados para mesial. No entanto, pouco se fala da correta aplicação das forças ortodônticas nesses dispositivos, sob o ponto de vista mecânico. OBJETIVOS: o objetivo desse artigo foi demonstrar uma mola mini-implante suportada para verticalizar molares inclinados para mesial. Com esse dispositivo consegue-se correta aplicação da mecânica ortodôntica, favorecendo movimentos mais previsíveis e minimizando os movimentos indesejáveis.

Antônio Carlos de Oliveira Ruellas

2013-02-01

234

The partial molar volumes of rare gases in aqueous solutions  

International Nuclear Information System (INIS)

A correlation ratio was suggested for calculating the limiting partial molar volumes of noble gases (He-Rn) in aqueous solution, which integrates the contribution made electronic polarizability of dissolved substance molecules as a result of their interaction with a uniform force field of the solvent. Conclusion was made on interrelation between volumetric properties and dissolving (hydration) mechanism of noble gases in water

235

Retroperitoneal arteriovenous malformation extending through the inferior vena cava into the heart and causing inferior vena cava dissection  

Energy Technology Data Exchange (ETDEWEB)

We present a case of retroperitoneal arteriovenous malformation extending through the inferior vena cava into the heart, which was associated with dissection of the inferior vena cava in a 32-year-old female. Computed tomography and magnetic resonance imaging showed a double-lumen inferior vena cava and a rod-like solid component attached to a sac-like lesion in the right heart chambers. Digital subtraction angiography showed an arteriovenous malformation draining to the inner lumen of the inferior vena cava. (orig.)

Sung, Yon Mi [Sungkyunkwan University School of Medicine, Department of Radiology and Center for Imaging Science, Seoul (Korea); Choe, Yeon Hyeon [Sungkyunkwan University School of Medicine, Department of Radiology and Center for Imaging Science, Seoul (Korea); Sungkyunkwan University School of Medicine, Cardiac and Vascular Center, Samsung Medical Center, Seoul (Korea); Park, Seung Woo [Sungkyunkwan University School of Medicine, Cardiac and Vascular Center, Samsung Medical Center, Seoul (Korea); Sungkyunkwan University School of Medicine, Department of Internal Medicine, Division of Cardiology, Seoul (Korea); Park, Pyo Won [Sungkyunkwan University School of Medicine, Cardiac and Vascular Center, Samsung Medical Center, Seoul (Korea); Sungkyunkwan University School of Medicine, Department of Thoracic and Cardiovascular Surgery, Seoul (Korea); Sung, Chang Ohk [Sungkyunkwan University School of Medicine, Department of Pathology, Seoul (Korea)

2005-06-01

236

Variant Inferior Root of Ansa Cervicalis / Variación de la Raíz Inferior del Asa Cervical  

Scientific Electronic Library Online (English)

Full Text Available El asa cervical es un loop de nervios que se encuentra en la pared anterior de la vaina carotídea, en el triángulo carotídeo del cuello, que inerva los músculos infrahioideos. Su raíz superior tiene fibras del primer nervio cervical que sale del nervio hipogloso y se une a la raíz inferior formada p [...] or las ramas de los nervios cervicales segundo y tercero. Las dos raíces se unen para formar el asa cervical. La formación del asa cervical del nervio es relativamente compleja, ya que su curso y ubicación varía a lo largo de los grandes vasos del cuello. En el lado izquierdo del cuello de un cadáver adulto de sexo masculino, la raíz inferior del asa cervical estaba ausente y las contribuciones de los ramos de C2 y C3 se unieron, de forma independiente, con la raíz superior del asa y así formar el loop. Abstract in english Ansa cervicalis is a loop of nerves found in the anterior wall of the carotid sheath in the carotid triangle of neck innervating infrahyoid muscles. Its superior root has fibres from the first cervical nerve that leaves the hypoglossal nerve and joins the inferior root formed by the branches from th [...] e second and third cervical nerves. The two roots join to form ansa cervicalis. The ansa cervicalis nerve formation is relatively complex, as its course and location along the great vessels of the neck vary. In the present case on the left side of an adult male cadaver the inferior root was absent and the contributions from C2 and C3 were joining independently with the superior root of ansa to form ansa cervicalis. However no such variation was found in the ansa cervicalis formation on the right side.

B. Prakash, Babu.

2011-03-01

237

Ausência de veia cava inferior: relato de caso / Absence of the inferior vena cava: case report  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese A ausência congênita de veia cava inferior é achado incomum e ocasional durante exames complementares ou cirurgias do abdome. Em razão de a maioria dos pacientes sem outras malformações serem assintomáticos, há dificuldade em estimar a prevalência dessas anomalias. O objetivo deste trabalho foi rela [...] tar o caso de um paciente de 28 anos, sexo masculino, referido para radiografia de tórax devido a quadro de febre alta (39ºC) não-responsiva à medicação. Radiografia de tórax sugeriu dilatação de veia ázigos. Em inquérito dirigido para sintomas cardiovasculares, referiu dor torácica (durante atividade física e em repouso) e dispneia ocasionais durante o sono associada ao período em que intensificou a prática de exercícios. Realizada tomografia computadorizada sem contraste e, posteriormente, contrastada. As mesmas não esclareceram o caso, fazendo-se necessário angiotomografia, a qual evidenciou ausência de veia cava inferior torácica. Abstract in english The congenital absence of the inferior vena cava is a rare and occasional finding at complementary exams or abdominal surgeries. As the majority of patients without other malformations are asymptomatic, it is hard to estimate the prevalence of these anomalies. Our goal was to report a case of a 28-y [...] ear-old patient, male, referred to thorax X-ray due to high fever state (39ºC), nonresponder to medication. The X-ray suggested azygos vein dilatation. The interview about cardiovascular symptoms revealed thoracic pain during both physical exercises and at rest, and occasional dyspnea during sleep related to the period of intensification of physical exercises. Computadorized tomography with and without contrast did not solve the case, what explain the request of an angiotomography, that showed absence of thoracic inferior vena cava.

Elton Correia, Alves; Gabriela Bóia Rocha, Ferro; Luciana Karla Lira, França; Mabel Batista, Jacó; Guilherme Benjamin Brandão, Pitta.

2010-12-01

238

El Trípode en la distalización unilateral de molares superiores: Cambios oclusales The tripod in the unilateral distalization of superior molars: Occlusal changes  

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Full Text Available OBJETIVO: aumentar los conocimientos en los tratamientos distalizadores, se realizó este estudio con una técnica distalizadora novedosa: el Trípode. MÉTODOS: el estudio incluyó 6 pacientes con clase II de Angle por mesogresión de los molares superiores y con ausencia clínica del segundo molar superior. Se evaluaron las modificaciones a nivel dental producidas por el trípode. RESULTADOS: los primeros molares superiores se distalizaron (3.36 mm, además, el molar sufrió una inclinación distal; las segundas bicúspides siguieron al molar en su movimiento distal, mientras que, la primera bicúspide del lado de la distalización se mesializó; los incisivos resultaron vestibularizados y la anchura transversal, medida a nivel de los primeros molares y primeras bicúspides, disminuyó, mientras que, en las segundas bicúspides aumentó. CONCLUSIONES: los cambios producidos con esta aparatología a nivel dental han sido: distalización de los primeros molares superiores (3.36 mm, además, el molar sufrió una inclinación distal; las segundas bicúspides siguieron al primer molar en su movimiento distal, mientras que, la primera bicúspide del lado de la distalización se mesializó; los incisivos resultaron vestibularizados; la anchura transversal medida a nivel de los primeros molares y primeras bicúspides disminuyó, mientras que, en las segundas bicúspides aumentóOBJECTIVE: to enhance the knowledge of the distalizing treatments, a study was conducted with a distalizing novel technique: the tripod. METHODS: the study included 6 patients with Angle class II due to mesogression of the superior molars and with clinical absence of the second superior molar. The modifications produced by the tripod at the dental level were evaluated. RESULTS: The first superior molars were distalized (3.36 mm. The molar also suffered a distal inclination, the second bicuspids followed the molar in its distal movement, whereas the first bicuspid of the side of the distalization was mesialized. The incisive were vestibularized and the cross-sectional width measured at the level of the first molars and the first bicuspids decreased, while in the second bicuspids increased. CONCLUSIONS: the changes caused by this apparatology at the dental level were the following: distalization of the first superior molars (3.36 mm; besides, the molar suffered a distal inclination; the second bicuspids followed the first molar in its distal movement, whereas the first bicuspid of the side of the distalization was mesialized; the incisives were vestibularized; the cross-sectional width measured at the level of the first molars and first bicuspids decreased, but in the second bicuspids it increased

Ania Moreno Véliz

2008-06-01

239

Distribution and characteristics of molar-incisor hypomineralization  

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Full Text Available Background/Aim. Developmental disorders of teeth are the problems that are becoming more present in pediatric dentistry, especially on first permanent molars and incisors. Molar Incisor Hypomineralization (MIH is proposed term for this phenomenon. The aim of this study was to establish the MIH prevalence in children living in the Fo?a municipality (Bosnia and Herzegovina as well as to assess characteristics and expression of hypomineralization within the tested population. Methods. A total of 141 children from the Fo?a municipality, 8 years of age, were included in this study. Criteria according to Weerhejm have been used for diagnosis of hypomineralization: demarcated opacity (DO, post-eruptive breakdown (PEB, atypical restoration (AR, extracted molars due to MIH (E-MIH and unerupted tooth (UT. Level and the prominence of color changes have been determined for patients with DO, PEB and AR. Results. MIH in this area was present in 12.8% of children. The prevalence of MIH changes expressed in percentages was as follows: DO was at 9.2%, PEB in 3.5%, AR in 5.6%, while E-MIH was 5.6%. A total of 9.9% of the examinees had mild, 5.6% moderate, and 7.8% severe form of MIH. White form of MIH defects was found in 9.9% of the examinees, white-yellow one in 5.6% and yellow-brown color in 3.5% of the examined children. These changes were more often present in the lower jaw (60.3%. In total, 6.4% of children had these changes present only on molars, while 6.4% of them both on molars and incisors simultaneously. Conclusion. A total of 12.8% of the examinees with MIH is not to be disregarded. With timely diagnosis, prevention and therapy complications could be avoided or mitigated.

Jankovi? Svjetlana

2014-01-01

240

Estudio de volumen molar y refracción molar de miscelas de triglicéridos (triacetina, tributirina o tricaprilina y alcoholes (etanol, 1-butanol o 1-hexanol  

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Full Text Available Values of molar refraction for every studied mixtures show linear plots versus molar fractions of triglyceride. Values of molar volume show this behaviour, but only for tributyrin-butanol or tricaprylin-butanol miscellas. However, in tributyrin-ethanol mixtures, volume contractions have been found, whereas triacetin-butanol and tributyrin-hexanol show volume expansions. These facts are related to the mode of being structured of the alcohol and triglyceride molecules in mixtures. A linear relationship between molar volume and temperature have been found, and also a linear dependence between the coefficient of thermal expansion at constant pressure and the molar fraction of triglyceride.

Los valores de la refracción molar en todas las miscelas estudiadas presentan variaciones lineales frente a la fracción molar de triglicérido. la misma variación que presentan los valores del volumen molar de las miscelas tributirina y tricaprilina en butanol. Sin embargo, en las miscelas de tributirina-etanol se encuentran contracciones de volumen mientras que en las de triacetina-butanol y tributirina-hexanol expansiones, atribuidas en ambos casos a la forma de estructurarse las moléculas de alcohol y triglicérido en las miscelas. Por otra parte, se encuentra una variación lineal entre el volumen molar de las miscelas y la temperatura, y se establece una relación lineal entre el coeficiente de dilatación térmico molar a presión constante y la fracción molar de triglicérido en los cinco sistemas estudiados.

Rodríguez Rodríguez, M.

1992-12-01

241

Clinical application and advancement of inferior vena cava filter  

International Nuclear Information System (INIS)

Deep venous thrombosis is a common disorder, with a considerably high incidence and mortality. Inferior vena cava filter provides fruitful means in decrease and prevention of fatal pulmonary embolism. The authors reviewed the history, indications and applications of inferior vena cava filter for different types of deep venous thrombosis, with outlook of future trends. (authors)

242

Internal structure of mandible around mandibular molar using computed tomography. Anatomical consideration of molar anchorage in orthodontic treatment  

International Nuclear Information System (INIS)

For establishment of fine occlusion, facial profile and oral function in orthodontic treatment, molar anchorage in teeth movement is important manner in extracted cases. The aims of this study were to investigate the relationship between facial morphology and internal structure of mandibular body in molar region by computer tomography, and to discuss about molar anchorage in orthodontic treatment. The data for this study were obtained from 35 modern male Japanese skulls (mean age; 27 year-old, ranged from 18 year-old to 47 year-old). Measurement variables were FMA, SN to mandibular plane angle, gonial angle, alveolar breadth, cortical bone thickness of buccal and lingual sides, and the distance between dental root and cortical bone. As a result, alveolar breadth and the distance between dental root and cortical bone were narrow in long facial type, on the contrary, these variables were wide in short facial type. The result suggested that these variables were considered important factors as molar anchorage in extracted cases. (author)

243

Ressonância magnética cardiovascular em veia cava inferior interrompida não prevista Cardiovascular magnetic resonance in unsuspected interrupted inferior vena cava Cardiovascular magnetic resonance in unsuspected interrupted inferior vena cava  

OpenAIRE

A Veia Cava Inferior (VCI) interrompida é uma anomalia rara. As anomalias da VCI são clinicamente importantes para os cardiologistas e radiologistas que pretendem intervir na cavidade cardíaca direita. Descrevemos três casos de interrupção da VCI diagnosticados por meio de estudo imaginológico de ressonância magnética cardíaca.La Vena Cava Inferior (VCI), interrumpida es una anomalía rara. Las anomalías de la VCI son clínicamente importantes para los cardiólogos y radiólogos qu...

Andre Mauricio Fernandes; Vikas Rathi; June Yamrozik; Ronald Willians; Biederman, Robert W.

2012-01-01

244

Terceros molares retenidos, su comportamiento en Cuba. Revisión de la literatura / Retained third molars, their behavior in Cuba. Literature review  

Scientific Electronic Library Online (English)

Full Text Available Introducción: el objetivo de este trabajo es realizar una revisión bibliográfica sobre la información de estudios realizados y publicados en diferentes provincias de Cuba, en los que se abordan las complicaciones pre y posoperatorias de los terceros molares retenidos. Metodología: se desarrolló una [...] estrategia de búsqueda con los términos: tercer molar retenido, meta-análisis, revisión sistemática, combinados con complicaciones pre y posoperatorias, utilizando las publicaciones encontradas desde enero de 1990 hasta junio de 2013. Discusión: se encontró en todos los estudios realizados en las diferentes provincias de Cuba, que los terceros molares son los dientes que presentan mayor posibilidades de retención, por lo que casi siempre tienen indicación de tratamiento quirúrgico, presentando diferentes complicaciones tanto pre como posoperatoria. Conclusiones: con esta revisión llegamos a la conclusión de que en los estudios realizados en las diferentes provincias de Cuba, la complicación preoperatoria más frecuente causada por terceros molares retenidos fue la pericoronaritis, la cual siempre viene acompañada de dolor y edema, y las complicaciones más frecuentes después de la cirugía son la celulitis facial posoperatoria, acompañada casi siempre de trismo y dolor. Abstract in english Background: the aim of this work is developing a bibliographic review on the studies carried out and published in several Cuban provinces, approaching pre-surgery and post-surgery complications of the third retained molars. Methodology: we developed a search strategy with the terms: third retained m [...] olar, meta-analyses, systematic review, combined with pre- and post-surgery complications, using literature published from January 1990 to June 2013. Discussion: in all the studies made in different Cuban provinces we found that the third molars are the teeth having greater retention possibilities, therefore their surgical treatment is almost always indicated; they present different pre- and post-surgery complications. Conclusions: with this review we arrived to the conclusion that in studies carried out in different Cuban provinces, the most frequent pre-surgery complication caused by the retained third molars was pericoronaritis, always accompanied by pain and edema, and the most frequent post-surgery complication was facial cellulites, almost always accompanied with trismus and pain.

Myrna, del Puerto Horta; Leivis, Casas Insua; Roberto, Cañete Villafranca.

245

The clinical application of inferior vena caval CO2-DSA  

International Nuclear Information System (INIS)

Objective: To explore the feasibility and safety of inferior vena caval CO2-DSA and evaluate the results of inferior vena cavography using CO2-DSA or iodinated contrast media. Methods: 25 patients diagnosed as deep venous thrombosis of lower limb were prepared to conceive the implantation of inferior vena caval filter. The inferior vena cava and right renal vein CO2-DSA and iodinated contrast media DSA were carried out through jugular or femoral vein approach in all patients. Results: The inferior vena caval angiography with CO2-DSA or iodinated contrast media were carried out successfully in all patients. The quality of the inferior vena caval angiogram showed: with CO2 as contrast media, 14 cases obtained excellent images and 11 cases had good images; with iodinated contrast media the images of 18 cases were excellent and 7 cases were good. No thrombus and variation of inferior vena cava were found by the two kinds of angiography. The diameter of inferior vena cava showed: (20.01 ± 0.83) mm with CO2 contrast media and (20.15 ± 0.92) mm with iodinated contrast media, (P=0.006); having statistical significance between them. The safety of angiography with CO2 presented only 1 case with transient slight decrease of O2 saturation. No abnormal changes were found in blood pressure, heart rate and so on. Conclusions: Inferior vena caval CO2-DSA is feasible and safe, with sta/sub>-DSA is feasible and safe, with statistical significance in the measurement of inferior vena caval diameter comparing with iodinated contrast material but with no influence on the implantation of filter. (authors)

246

Imaging evaluation of the inferior vena cava.  

Science.gov (United States)

The inferior vena cava (IVC) is an essential but often overlooked structure at abdominal imaging. It is associated with a wide variety of congenital and pathologic processes and can be a source of vital information for referring clinicians. Initial evaluation of the IVC is most likely to occur at computed tomography performed for another indication. Many routine abdominal imaging protocols may result in suboptimal evaluation of the IVC; however, techniques to assist in specific evaluation of the IVC can be used. In this article, the authors review the spectrum of IVC variants and pathologic processes and the relevant findings from magnetic resonance imaging, angiography, sonography, and positron emission tomography. Embryologic development of the IVC and examples of congenital IVC variants, such as absence, duplication, left-sided location, azygous or hemiazygous continuation, and web formation, are described. The authors detail IVC involvement in Wilms tumor, leiomyosarcoma, adrenal cortical carcinoma, testicular carcinoma, hepatocellular carcinoma, renal cell carcinoma, and other neoplasms, as well as postsurgical, traumatic, and infectious entities (including filter malposition, mesocaval shunt, and septic thrombophlebitis). The implications of these entities for patient treatment and instances in which specific details should be included in the dictated radiology report are highlighted. Furthermore, the common pitfalls of IVC imaging are discussed. The information provided in this review will allow radiologists to detect and accurately characterize IVC abnormalities to guide clinical decision making and improve patient care. (©)RSNA, 2015. PMID:25763740

Smillie, Richard P; Shetty, Monisha; Boyer, Andrew C; Madrazo, Beatrice; Jafri, Syed Zafar

2015-01-01

247

Adaptive global synchrony of inferior olive neurons  

Energy Technology Data Exchange (ETDEWEB)

This paper treats the question of global adaptive synchronization of inferior olive neurons (IONs) based on the immersion and invariance approach. The ION exhibits a variety of orbits as the parameter (termed the bifurcation parameter), which appears in its nonlinear functions, is varied. It is seen that once the bifurcation parameter exceeds a critical value, the stability of the equilibrium point of the ION is lost, and periodic orbits are born. The size and shape of the orbits depend on the value of the bifurcation parameter. It is assumed that bifurcation parameters of the IONs are not known. The orbits of IONs beginning from arbitrary initial conditions are not synchronized. For the synchronization of the IONs, a non-certainty equivalent adaptation law is derived. The control system has a modular structure consisting of an identifier and a control module. Using the Lyapunov approach, it is shown that in the closed-loop system, global synchronization of the neurons with a prescribed relative phase is accomplished, and the estimated bifurcation parameters converge to the true parameters. Unlike the certainty-equivalent adaptive control systems, an interesting feature of the designed control system is that whenever the estimated parameters coincide with the true values, the parameter estimates remain frozen thereafter, and the closed-loop system recovers the performance of the deterministic closed-loop system. Simulation results are presented which show that in the closed-loop system, the synchrony of neurons with prescribed phases is accomplished despite the uncertainties in the bifurcation parameters.

Lee, Keum W [Division of Electronic Information and Communication, University of Kwandong, Gangwon (Korea, Republic of); Singh, Sahjendra N, E-mail: sahaj@egr.unlv.ed [Department of Electrical and Computer Engineering, University of Nevada Las Vegas, Las Vegas, NV 89154-4026 (United States)

2009-09-15

248

Evaluation of superior-inferior position of mandibular canal and its anatomic variations on panoramic radiographs in patients over 18 referring to Khorasgan Dental School  

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Full Text Available Introduction: Attention to the location and the shape of mandibular canal is necessary to prevent problems during mandibular surgeries. This study was determined the prevalence of superior-inferior position of mandibular canal and its anatomic variations on panoramic radiographs in patients over 18 referring to Khorasgan Dental School.Materials and methods: In this descriptive-analytical study 260 radiographs were examined for variations in the position of mandibular canal. The subjects’ personal data, type of mandibular canal regarding its position based on Nortje‘s classification (high, low or intermediate position in relation to the apex of the first molar root and inferior border of the mandible, the distance from the superior border of lingula to the center of the ramus, existence of bifid canal and its shape and side and existence of anesthesia problems or impacted teeth on the same side as the bifid canal, were recorded. Data was analyzed by SPSS 10, using chi-squared test (?=0.05.Results: The most common canals in relation to their position relative to the first molar area, in descending order, were canals in middle position (55.8%, in the low position (35%, and in the high position (9.2%, respectively. No statistically significant differences were observed between the frequency distributions of canal positions (p value = 0.14%. The average distances from the superior border of lingula to the center of the ramus, in low position, middle position, and high position canals were 10.7, 11.35, and 10.87 mm, with no statistically significant differences (p value = 0.14. Conclusion: According to the results, there were no statistically significant differences between the frequency distributions of different positions of mandibular canals in relation to the root apex of the first molar and also between the distances from the lingual to the center of the ramus. Similar studies using CT scan technique are recommended. Key words: Inferior alveolar nerve, Mandible, Panoramic radiography.

Roshanak Ghafari

2011-01-01

249

Agenesia de veia cava inferior associada à trombose venosa profunda Agenesis of inferior vena cava associated with deep venous thrombosis  

Directory of Open Access Journals (Sweden)

Full Text Available A agenesia da veia cava inferior é uma anomalia congênita rara, que foi recentemente identificada como um importante fator de risco para o desenvolvimento e a recorrência de trombose venosa profunda de membros inferiores em jovens. O objetivo deste trabalho foi relatar o caso de uma paciente que apresentou trombose venosa profunda dois meses após a realização de cirurgia de varizes. A angiotomografia computadorizada demonstrou a presença de anomalia venosa complexa com ausência da veia cava inferior.The agenesis of the inferior vena cava is a rare congenital anomaly, which was recently identified as an important risk factor for the development and recurrence of deep venous thrombosis especially in young people. The goal of this work was to report the case of a patient who presented deep venous thrombosis approximately two months after varicose vein surgery. The computerized angiotomography demonstrated the presence of a complex venous anomaly with absence of the inferior vena cava.

Clovis Luis Konopka

2010-09-01

250

Mudanças na apresentação clínica da gravidez molar The changing clinical presentation of molar pregnancy  

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Full Text Available OBJETIVO: determinar se a apresentação clínica da mola hidatiforme tem mudado nos últimos anos (1992-1998 quando comparada a registros históricos de controle (1960-1981. MÉTODOS: foram revisadas 80 fichas de pacientes com mola hidatiforme acompanhadas entre 1960-1981 no Centro de Neoplasia Trofoblástica Gestacional da Santa Casa da Misericórdia (Rio de Janeiro Brasil e as de 801 pacientes atendidas entre 1992-1998 no mesmo centro. Foram analisados os seguintes parâmetros: idade, número de gestações, sangramento vaginal, hiperêmese, edema dos membros inferiores, hipertensão arterial, útero grande para a idade gestacional e cistos teca-luteínicos dos ovários. Para análise estatística foram utilizados os testes do qui-quadrado e o cálculo do odds ratio (OR com intervalo de confiança (IC de 95%. RESULTADOS: com relação à idade, a ocorrência de mola em pacientes com menos de 15 anos ou mais de 40 foi significativamente mais freqüente no grupo II do que no grupo I; quanto ao número de gestações, a diferença entre os dois grupos só não foi significativa entre aquelas pacientes que gestavam pela terceira e quarta vez. A hipertensão arterial, foi detectada em porcentagem semelhante nos dois grupos e útero grande para a idade gestacional foi mais freqüente no grupo II (41,4 vs 31,2% - p OBJECTIVE: to determine whether the clinical presentation of hydatidiform mole has changed in the recent years (1992-1998 when compared with historic controls (1960-1981. METHODS: medical records of 80 patients with hydatidiform mole attended in the 1960-1981 period (Group I were reviewed and compared to data from 801 patients followed in the 1992-1998 period (Group II. The clinical signals and symptoms analyzed were: age distribution, number of pregnancies, vaginal bleeding, hyperemesis, edema, hypertension, large uterus for gestation date and theca lutein cysts of the ovaries. Statistical analyses employed chi-square tests and odds ratio (OR estimate with the confidence interval (CI of 95%. RESULTS: concerning age, the disease occurred more frequently in group II than in group I, in patients under 15 and over 40 years old. As to the number of pregnancies, there was no statistical difference only in those patients who were in their third or fourth pregnancies. Arterial hypertension was the only symptom that occurred with similar frequency in both groups. Enlarged uterus was more frequent in group II (41.4 X 31.2% - p <0.05; OR: 1.5; IC: 1.0-2.3. Bleeding remained the most common symptom, occurring in 76.9% of patients (Group II, although it has occurred in 98.7% of the historic controls (p<0.05; OR: 0.04; IC: 0.03 0.04. The following symptoms were also less frequent in group II as compared to group I: hyperemesis (36.5% X 45% - p<0.05; OR: 0.7; IC: 0.4 0.9, edema (12.7% X 20% - p<0.05, OR: 0.5, IC: 0.3 0.8, enlarged uterus for gestational age (41.4% x 31.2% - p<0.05; OR: 1.5; IC: 1.0 2.3 and theca lutein cysts (16.4% X 41.2% - p<0.05; OR: 0.3; IC: 0.2 0.4. Ultrasound has become the commonest method of diagnosis (89.2% - p<0.05, allowing early detection of hydatidiform moles. CONCLUSION: there was a decrease of the traditional symptoms in current patients with hydatidiform mole as compared to historic controls, due to early diagnosis through ultrasonography.

Paulo Belfort

2004-07-01

251

Thermal Correction to the Molar Polarizability of a Boltzmann Gas  

CERN Document Server

Metrology in atomic physics has been crucial for a number of advanced determinations of fundamental constants. In addition to very precise frequency measurements, the molar polarizability of an atomic gas has recently also been measured very accurately. Part of the motivation for the measurements is due to ongoing efforts to redefine the International System of Units (SI) for which an accurate value of the Boltzmann constant is needed. Here, we calculate the dominant shift of the molar polarizability in an atomic gas due to thermal effects. It is given by the relativistic correction to the dipole interaction, which emerges when the probing electric field is Lorenz transformed into the rest frame of the atoms that undergo thermal motion. While this effect is small when compared to currently available experimental accuracy, the relativistic correction to the dipole interaction is much larger than the thermal shift of the polarizability induced by blackbody radiation.

Jentschura, U D; Mohr, P J

2013-01-01

252

Complication of Invasive Molar Pregnancy with Clostridium perfringens Sepsis.  

Science.gov (United States)

Clostridium perfringens (CP) is an anaerobic, Gram-positive bacillus associated with malignant diseases and near-term pregnancies. The necrotic tissue that results from these disease processes fuels the proliferation of CP, leading to gas gangrene and subsequently sepsis. Herein, we report a case of a 41-year-old female patient with a history of invasive molar pregnancy that was further complicated with a CP infection. Although past research has shown a link between Clostridium infection and choriocarcinoma (Chern-Horng and Hsieh, 1999), no previous cases of CP infection have been associated with invasive molar pregnancy. We also report complete resolution of the CP sepsis and its associated symptoms following the hysterectomy. PMID:24716030

Singh, Sanmeet; Angra, Kunal; Davis, Bonnie; Shokrani, Babak

2014-01-01

253

Density and molar volume studies of phosphate glasses  

Directory of Open Access Journals (Sweden)

Full Text Available The density and molar volume of some phosphate glasses (xNa2O•(100-xP2O5, x = 30, 35, 40, 45, 50; xB2O3•(1-xNaPO3, x = 5, 10, 15, 20, 25; xNa2O•(30-x K2O•10Al2O3• 25B2O3•35P2O5, x= 5, 10, 15, 20, 25 glasses were determined, in order to study their structure. The density of the glasses increased while their molar volume values decreases with the increase of sodium oxide content in phosphate glasses. The results obtained could be correlated to several factors such as the polarization, the field strengths and the ionic radii of the different incorporated cations.

Chanshetti U.B.

2011-01-01

254

Inflammatory root resorption in primary molars: prevalence and associated factors  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english This study aimed at determining the prevalence of inflammatory root resorption and associated factors in 1068 primary mandibular molars in 453 children 3 to 12 years of age. Age, dental history and medical history were recorded using a questionnaire administered to the children's parents/caregivers. [...] Previously trained and calibrated examiners assessed radiographic images of the primary molars by direct observation, with the aid of a viewing box. Root resorption (physiological or inflammatory), dental crown status (healthy, carious with no pulp involvement, carious with pulp involvement and evidence of restoration), and pulpotomy or pulpectomy were determined. Data analysis involved descriptive statistics, the chi-square test and a multiple logistic regression (p

Raquel Gonçalves, Vieira-Andrade; Clarissa Lopes, Drumond; Laura Pereira Azevedo, Alves; Leandro Silva, Marques; Maria Letícia, Ramos-Jorge.

2012-08-01

255

The partial molar volume of water in biological membranes.  

OpenAIRE

A new algorithm is presented for interpreting the hydration dependence of x-ray diffraction measurements. The method assumes that the volume of the hydrocarbon phase of the lipid bilayer is not affected by hydration and that the volume expansion between bilayers at maximum hydration is caused by incorporation of water molecules whose partial molar volume is that of pure bulk water. These simple assumptions lead to a determination of the area expansion (and hence change in hydrocarbon-phase th...

Scherer, J. R.

1987-01-01

256

Moxel: A molar tooth voxel model for dosimetric studies  

Energy Technology Data Exchange (ETDEWEB)

Stylized numerical models of the tooth are usually employed in qualification procedure related to Electronic Paramagnetic Resonance in long-term accidental contamination dose reconstruction. In this work a voxel model was developed from the microCT image data set of a human non contaminated molar tooth. A stylized model, reproducing the characteristics of the voxel model, was also created in order to investigate the level of accuracy that can be obtained in this kind of study.

Ferrari, P., E-mail: paolo.ferrari@enea.i [ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ION-IRP, Radiation Protection Institute, 16 Via dei Colli, 40136 Bologna (Italy); Gualdrini, G. [ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ION-IRP, Radiation Protection Institute, 16 Via dei Colli, 40136 Bologna (Italy); Fattibene, P. [Istituto Superiore di Sanita, Department of Technology and Health, Viale Regina Elena 299, I-00161 Roma (Italy); Istituto Nazionale di Fisica Nucleare, Sezione di Roma, Gruppo Collegato Sanita, Viale Regina Elena 299, I-00161 Roma (Italy); Veronese, I. [Universita degli Studi di Milano, Dipartimento di Fisica, Via Celoria 16, 20133 Milano (Italy); INFN, Sezione di Milano, Via Celoria 16, 20133 Milano (Italy)

2010-02-15

257

Moxel: A molar tooth voxel model for dosimetric studies  

International Nuclear Information System (INIS)

Stylized numerical models of the tooth are usually employed in qualification procedure related to Electronic Paramagnetic Resonance in long-term accidental contamination dose reconstruction. In this work a voxel model was developed from the microCT image data set of a human non contaminated molar tooth. A stylized model, reproducing the characteristics of the voxel model, was also created in order to investigate the level of accuracy that can be obtained in this kind of study.

258

Bilateral Taurodontism in Deciduous Molars: A case Report  

Directory of Open Access Journals (Sweden)

Full Text Available Taurodontism is a rare dental anomaly in which the involved tooth has an enlarged and elongated body and pulpchamber with apical displacement of the pulpal floor. It has a very low incidence and very few cases are reported inliterature in deciduous dentition. Endodontic treatment of a taurodont tooth is challenging and requires special handlingbecause of the proximity and apical displacement of the roots. In this article a case of five year child with bilateralinvolvement of mandibular second molars is presented.

Parimala Tyagi,

2010-01-01

259

Cyclophosphamide inhibits root development of molar teeth in growing mice.  

Science.gov (United States)

Root development of permanent teeth is disturbed in survivors of childhood cancer. Cyclophosphamide (CY) is a cytostatic drug commonly used for chemotherapy in children with cancer. This study aimed to evaluate the effects of CY on the development of molar teeth until the completion of occlusion in young mice, focusing on Hertwig's epithelial root sheath (HERS). We treated thirty-two 12-day-old ICR mice with CY (100 mg/kg; 100-CY group), and 36 control mice with saline. At 12, 14, 16, 20, 24, 27, 39, 60, and 76 days of age, the mandibular molars were removed. Soft X-ray radiographs were obtained in lateral projection. The root/crown length (R/C) ratio of the first molar was calculated. Serial sagittal sections were prepared and histomorphological hematoxylin and eosin (HE) staining and immunohistochemical (cytokeratin) studies were performed. The R/C ratio of the 100-CY group (0.78) was smaller than that of the control group (1.23) at 76 days (p roots developed further after injection, microscopic examination showed that the roots of the first molars that developed in the 100-CY group were shorter than those in the control group. In addition, experimental mice showed apical closure of the roots. By 20 days after injection, the HERS had disappeared from the root surface in the 100-CY group. In conclusion, this study indicates that CY can induce a defect in HERS and cause early loss of HERS. Disruption of the epithelial sheath inhibits normal root formation, and it could cause irreversible short-root development. PMID:24888490

Kawakami, Tomomi; Nakamura, Yuko; Karibe, Hiroyuki

2014-06-01

260

Factores asociados a la pérdida del primer molar permanente en escolares de Campeche, México: Pérdida del primer molar permanente / Associated factors to loss of the first permanent molar on scholars of Campeche, Mexico  

Scientific Electronic Library Online (English)

Full Text Available Objetivo: 1) determinar la prevalencia de pérdida del primer molar permanente (PMP) en niños escolares de 6 a 13 años de edad, e 2) investigar la relación entre la pérdida del PMP y factores sociodemográficos, socioeconómicos, conductuales y clínicos. Material y Métodos: Se realizó un estudio transv [...] ersal en 1517 escolares de la ciudad de Campeche, México. Un cuestionario estructurado dirigido a las madres fue enviado a estas para explorar las variables sociodemográficas, socioeconómicas y conductuales. En los niños se efectuó un examen bucal clínico. En el análisis se realizaron estadísticas descriptivas y un modelo multivariado de regresión logística binaria. Resultados: La prevalencia de sujetos con al menos un PMP perdido fue de 7.5% (n=114). De los 6,068 PMP examinados, 2.1% (n=130) se clasificaron como perdidos. Los PMP de la arcada inferior se perdieron con mayor frecuencia (70%, n=91). Las variables asociadas a la pérdida del PMP que permanecieron en el modelo final fueron: mayor edad (RM= 1.66, IC95%= 1.45 - 1.89) y la higiene bucal regular e inadecuada (RM= 2.64, IC95%= 1.39 - 5.02). Así como una interacción entre los defectos estructurales del esmalte y el sexo, considerando 1) el efecto del defecto estructural del esmalte en los niños (RM= 9.84, IC95%= 4.82 - 20.14), y 2) el efecto del defecto estructural del esmalte en las niñas (RM= 38.10, IC95%= 18.98 - 76.48). Conclusiones: La prevalencia de pérdida del PMP fue relativamente alta considerando el grupo de edad bajo investigación (6-13 años de edad). Encontramos variables de diversos tipos asociadas a la pérdida del PMP. Los datos presentados sirven como un indicador del estado de salud bucal y podrían ser empleados como línea basal para la evaluación de programas de salud dental preventivos Abstract in english Abstract Objectives: 1) to determine the prevalence of loss of the first permanent molar (FPM) on schoolchildren aged 6-13 years, and 2) to investigate the relationship between loss of FPM and sociodemographic, socioeconomic, behavioural, and clinic factors. Material and Methods: A cross-sectional s [...] tudy on 1517 children of Campeche City, Mexico. The children’s mothers were surveyed using a questionnaire to investigate sociodemographic, socioeconomic, behavioural variables. Clinic dental examinations were realized in children. In the analyses, descriptive statistics and binary logistic regression analyses were used. Results: The prevalence of subjects with at least one FPM lost was 7.5% (n=114). Of 6,068 FMP examined, 2.1% (n=130) were classified as lost. The mandibular FPM were lost more frequently (70%, n=91). The associated variables to loss of FPM that remained in the final model were: higher age (OR= 1.66, CI95%= 1.45 - 1.89) and regular and inadequate oral hygiene (OR= 2.64, CI95%= 1.39 - 5.02). As well as an interaction between structural enamel defects and sex, thus we can consider 1) the effect of structural enamel defects on boys (OR= 9.84, CI95%= 4.82 - 20.14), and 2) the effect of structural enamel defects on girls (OR= 38.10, CI95%= 18.98 - 76.48). Conclusions: The prevalence of loss of the FPM was relatively higher considered the age group under investigation (6-13 years old). We found variables of diverse types associated with loss of the FPM. The data presented serve like an indicator of the oral health status and could be employees as baseline for the evaluation of preventive dental health programs

Alejandro José, Casanova-Rosado, M en C; Carlo Eduardo, Medina-Solís, M en C²; Juan Fernando, Casanova-Rosado, CDEO., M en C¹; Ana Alicia, Vallejos-Sánchez, M en C¹; Gerardo, Maupomé., PhD3; Maria de la Luz, Kageyama-Escobar, Dra en C.

261

Cateterização dos seios petrosos inferiores: aspectos técnicos / Inferior petrosal sinus catheterization: technical aspects  

Scientific Electronic Library Online (English)

Full Text Available OBJETIVO: O cateterismo dos seios petrosos inferiores (SPI) ajuda a diferenciar as formas hipofisária e ectópica na síndrome de Cushing (SC). O objetivo desse trabalho é descrever a técnica empregada em nosso serviço, discutir a solução de dificuldades e verificar o índice de sucesso atingido. CASUÍ [...] STICA E MÉTODO: Foram submetidos a cateterismo bilateral dos SPI 42 pacientes com SC, entre setembro de 2000 e setembro de 2005. As dificuldades para o posicionamento do cateter foram correlacionadas com as soluções empregadas. RESULTADOS: As variações anatômicas, a semelhança entre o SPI e a veia emissária do plexo basilar e a dificuldade de contrastar as estruturas a contrafluxo para localizá-las foram os principais problemas. Foram utilizados cateter pré-moldado, fio-guia semicurvo e dirigível, road-maping e venografia por injeção contralateral, além de critérios para diferenciar o SPI da veia emissária. Dos 84 SPI abordados, um apresentava trombose, e dos 83 possíveis, 80 (96,4%) foram cateterizados. Não se observaram complicações. CONCLUSÃO: A cateterização dos SPI pode ser feita na maioria dos pacientes. A identificação da veia emissária do plexo basilar e o uso de flebografia por injeção contralateral melhoraram o desempenho do método. Abstract in english PURPOSE: Inferior petrosal sinus catheterization and sampling for corticotropin dosage helps to differentiate hypophisary and ectopic forms of Cushing syndrome. The aim of this paper is to describe the technique used in inferior petrosal sinus catheterization in our service, emphasizing the solution [...] found for frequent difficulties, and verify the success rate achieved. PATIENTS AND METHODS: Between September/2000 and September/2005, forty-two (eighty-four sinuses) patients were submitted to inferior petrosal sinus sampling. The difficulties for correct catheter positioning were identified and correlated with their solutions. RESULTS: Anatomical variations, similarity between IPS and emissary vein of the basilar plexus and unfavorable flow to the contrastation of the structures (retrograde catheterization) were the main problems. Using pre-shaped catheters, curved, steerable guide-wires, road-maping and venography by contalateral injection, besides criteria to differentiate IPS from the emissary vein. Of the 84 sinuses approached, one was thrombosed, and 80 (96.4%) of 83 possible were selectively catheterized. No clinical complication occurred. CONCLUSION: IPSC can be safe and successfully performed in most cases. The identification of the emissary vein of the basilar plexus and use of venography by contralateral injection, improved the method performance.

Paulo, Puglia Jr.; José G. M. P., Caldas; Leandro A., Barbosa; Antenor T., Sá Jr.; Márcio C., Machado; Luis R., Salgado.

2008-06-01

262

Cateterização dos seios petrosos inferiores: aspectos técnicos Inferior petrosal sinus catheterization: technical aspects  

Directory of Open Access Journals (Sweden)

Full Text Available OBJETIVO: O cateterismo dos seios petrosos inferiores (SPI ajuda a diferenciar as formas hipofisária e ectópica na síndrome de Cushing (SC. O objetivo desse trabalho é descrever a técnica empregada em nosso serviço, discutir a solução de dificuldades e verificar o índice de sucesso atingido. CASUÍSTICA E MÉTODO: Foram submetidos a cateterismo bilateral dos SPI 42 pacientes com SC, entre setembro de 2000 e setembro de 2005. As dificuldades para o posicionamento do cateter foram correlacionadas com as soluções empregadas. RESULTADOS: As variações anatômicas, a semelhança entre o SPI e a veia emissária do plexo basilar e a dificuldade de contrastar as estruturas a contrafluxo para localizá-las foram os principais problemas. Foram utilizados cateter pré-moldado, fio-guia semicurvo e dirigível, road-maping e venografia por injeção contralateral, além de critérios para diferenciar o SPI da veia emissária. Dos 84 SPI abordados, um apresentava trombose, e dos 83 possíveis, 80 (96,4% foram cateterizados. Não se observaram complicações. CONCLUSÃO: A cateterização dos SPI pode ser feita na maioria dos pacientes. A identificação da veia emissária do plexo basilar e o uso de flebografia por injeção contralateral melhoraram o desempenho do método.PURPOSE: Inferior petrosal sinus catheterization and sampling for corticotropin dosage helps to differentiate hypophisary and ectopic forms of Cushing syndrome. The aim of this paper is to describe the technique used in inferior petrosal sinus catheterization in our service, emphasizing the solution found for frequent difficulties, and verify the success rate achieved. PATIENTS AND METHODS: Between September/2000 and September/2005, forty-two (eighty-four sinuses patients were submitted to inferior petrosal sinus sampling. The difficulties for correct catheter positioning were identified and correlated with their solutions. RESULTS: Anatomical variations, similarity between IPS and emissary vein of the basilar plexus and unfavorable flow to the contrastation of the structures (retrograde catheterization were the main problems. Using pre-shaped catheters, curved, steerable guide-wires, road-maping and venography by contalateral injection, besides criteria to differentiate IPS from the emissary vein. Of the 84 sinuses approached, one was thrombosed, and 80 (96.4% of 83 possible were selectively catheterized. No clinical complication occurred. CONCLUSION: IPSC can be safe and successfully performed in most cases. The identification of the emissary vein of the basilar plexus and use of venography by contralateral injection, improved the method performance.

Paulo Puglia Jr.

2008-06-01

263

Determination of partial molar volumes from free energy perturbation theory.  

Science.gov (United States)

Partial molar volume is an important thermodynamic property that gives insights into molecular size and intermolecular interactions in solution. Theoretical frameworks for determining the partial molar volume (V°) of a solvated molecule generally apply Scaled Particle Theory or Kirkwood-Buff theory. With the current abilities to perform long molecular dynamics and Monte Carlo simulations, more direct methods are gaining popularity, such as computing V° directly as the difference in computed volume from two simulations, one with a solute present and another without. Thermodynamically, V° can also be determined as the pressure derivative of the free energy of solvation in the limit of infinite dilution. Both approaches are considered herein with the use of free energy perturbation (FEP) calculations to compute the necessary free energies of solvation at elevated pressures. Absolute and relative partial molar volumes are computed for benzene and benzene derivatives using the OPLS-AA force field. The mean unsigned error for all molecules is 2.8 cm(3) mol(-1). The present methodology should find use in many contexts such as the development and testing of force fields for use in computer simulations of organic and biomolecular systems, as a complement to related experimental studies, and to develop a deeper understanding of solute-solvent interactions. PMID:25589343

Vilseck, Jonah Z; Tirado-Rives, Julian; Jorgensen, William L

2015-04-01

264

Intranasal atomized dexmedetomidine for sedation during third molar extraction.  

Science.gov (United States)

The purpose of this study was to evaluate the intranasal use of 1.5 ?g/kg atomized dexmedetomidine for sedation in patients undergoing mandibular third molar removal. Eighteen patients underwent third molar removal in two surgical sessions. Patients were randomly assigned to receive intranasal water (placebo group) or 1.5 ?g/kg atomized dexmedetomidine (group D) at the first session. The alternate regimen was used during the second session. Local anaesthesia was injected 30 min after placebo/sedative administration. Pain from local anaesthesia infiltration was rated on a scale from zero (no pain) to 10 (worst pain imaginable). Sedation status was measured every 10 min by a blinded observer with a modified Observer's Assessment of Alertness/Sedation (OAA/S) scale and the bispectral index (BIS). Adverse reactions and analgesic consumption were recorded. Sedation values in group D were significantly different from placebo at 20-30 min, peaked at 40-50 min, and returned to placebo levels at 70-80 min after intranasal drug administration. Group D displayed decreased heart rate and systolic blood pressure, but the decreases did not exceed 20% of the baseline values. Intranasal administration of 1.5 ?g/kg atomized dexmedetomidine is effective, convenient, and safe as a sedative for patients undergoing third molar extraction. PMID:23497981

Nooh, N; Sheta, S A; Abdullah, W A; Abdelhalim, A A

2013-07-01

265

Ultrasensitive biosensing on the zepto-molar level.  

Science.gov (United States)

Detection of analytes on the zepto-molar (10(-21) M) level has been achieved using a field-effect bio-detector. By applying a gating voltage to enzymes immobilized on the working electrode of the detector, amplification of the biocatalytic current was observed. The amplification is attributed to the modification of the tunnel barrier between the enzyme and the electrode by the gating voltage-induced electric field which exists at the solution-electrode interface. The detection was demonstrated with the glucose oxidase (GOx)-glucose and alcohol dehydrogenase (ADH)-ethanol biocatalytic systems. Glucose at zepto-molar level was detected with zepto-molar detection resolution. Equivalently, 30 glucose molecules present in the sample were detected and the detection system responded distinctively to the incremental change in the number of glucose molecules in unit of 30 molecules. The enzyme's biospecificity was also preserved in the presence of the applied field. We present possible processes that could give rise to the electrical charges required to produce the observed current level. PMID:21295965

Choi, Yongki; Yau, Siu-Tung

2011-03-15

266

The use of deciduous molars in EPR dose reconstruction  

International Nuclear Information System (INIS)

The use of deciduous teeth in EPR dose reconstruction has the unique potential to measure individual doses that were accumulated in the early childhood in the age up to 12 years. It was found previously that due to the small size of deciduous incisors, the available amount of enamel is not sufficient for EPR measurements. Therefore, dose assessment with deciduous incisors can only be done by measurement of whole teeth, including enamel and dentine. The measurement of whole teeth instead of enamel alone is possibly less reliable for dose reconstruction because the stability of CO2- radicals (that are an indicator for the absorbed dose) in biologically active dentine is not known. In the present study naturally loosed deciduous molars were investigated. The feasibility of separating enamel from small size molars was analysed. EPR spectrum parameters of whole molars and separated enamel only were evaluated before and after laboratory irradiation. The EPR signal amplitudes of the CO2- and native signals were determined by spectrum deconvolution, in dependence on radiation dose in the range 0.1 - 10 Gy. The fading at room temperature of native and CO2- EPR signals was analysed. The detection threshold for absorbed dose in enamel was determined.

267

A new method for the determination of the nitrogen content of nitrocellulose based on the molar ratio of nitrite-to-nitrate ions released after alkaline hydrolysis.  

Science.gov (United States)

A new method was proposed to determine the nitrogen content of nitrocelluloses (NCs). It is based on the finding of a linear relationship between the nitrogen content and the molar ratio of nitrite-to-nitrate ions released after alkaline hydrolysis. Capillary electrophoresis was used to monitor the concentration of nitrite and nitrate ions. The influences of hydrolysis time and molar mass of NC on the molar ratio of nitrite-to-nitrate ions were investigated, and new insights into the understanding of the alkaline denitration mechanism of NCs, underlying this analytical strategy is provided. The method was then tested successfully with various explosive and non-explosive NC-containing samples such as various daily products and smokeless gunpowders. Inherently to its principle exploiting a concentration ratio, this method shows very good repeatability in the determination of nitrogen content in real samples with relative standard deviation (n=3) inferior to 1.5%, and also provides very significant advantages with respect to sample extraction, analysis time (1h for alkaline hydrolysis, 3min for electrophoretic separation), which was about 5 times shorter than for the classical Devarda's method, currently used in industry, and safety conditions (no need for preliminary drying NC samples, mild hydrolysis conditions with 1M sodium hydroxide for 1h at 60°C). PMID:25562808

Alinat, Elodie; Delaunay, Nathalie; Archer, Xavier; Mallet, Jean-Maurice; Gareil, Pierre

2015-04-01

268

MR venography of the inferior mesentery vein  

International Nuclear Information System (INIS)

Objective: To evaluate on three-dimensional (3D) dynamic contrast-enhanced (DCE) MR venography (MRV), the visibility of the inferior mesenteric vein (IMV), its insertion pattern into the portal system, and the difference of IMV diameters between healthy subjects and patients with cirrhosis. Materials and methods: Two hundred and seventeen consecutive patients who had abdominal 3D DCE MRI was included in this study. The original image data of 3D DCE MRI was used to generate multiple planar volume reconstruction (MPVR) images, which were evaluated for visualization of the IMV and its pattern of insertion into the portal system. The diameter of IMV was measured and compared in 24 patients with cirrhosis (Cirrhosis Group) and in 30 patients without hepatic lesions or liver disease (Healthy Group). Results: In the 217 patients, the frequencies of visualization of IMV, grade 1 order branches and grade 2 order branches were, respectively, 88%, 24% and 9%. The IMV inserted into the splenic vein (SV), the portal confluence and the superior mesenteric vein (SMV) in 45%, 18% and 37%, respectively. Among patients with cirrhosis, 12.5% had IMV diameter larger than 5.1 mm, although there was no significant difference between cirrhosis and healthy groups (P > 0.05). However, the diameters of the main portal vein (MPV), SV and SMV were significantly larger in the Cirrhosis Group (P < 0.05). Conclusion: The IMV and its branches can be depicted well by 3D DCE MRV. The most common inser well by 3D DCE MRV. The most common insertion of the IMV is into the splenic vein. A minority of patients with cirrhosis had dilatation of the IMV

269

MR venography of the inferior mesentery vein  

Energy Technology Data Exchange (ETDEWEB)

Objective: To evaluate on three-dimensional (3D) dynamic contrast-enhanced (DCE) MR venography (MRV), the visibility of the inferior mesenteric vein (IMV), its insertion pattern into the portal system, and the difference of IMV diameters between healthy subjects and patients with cirrhosis. Materials and methods: Two hundred and seventeen consecutive patients who had abdominal 3D DCE MRI was included in this study. The original image data of 3D DCE MRI was used to generate multiple planar volume reconstruction (MPVR) images, which were evaluated for visualization of the IMV and its pattern of insertion into the portal system. The diameter of IMV was measured and compared in 24 patients with cirrhosis (Cirrhosis Group) and in 30 patients without hepatic lesions or liver disease (Healthy Group). Results: In the 217 patients, the frequencies of visualization of IMV, grade 1 order branches and grade 2 order branches were, respectively, 88%, 24% and 9%. The IMV inserted into the splenic vein (SV), the portal confluence and the superior mesenteric vein (SMV) in 45%, 18% and 37%, respectively. Among patients with cirrhosis, 12.5% had IMV diameter larger than 5.1 mm, although there was no significant difference between cirrhosis and healthy groups (P > 0.05). However, the diameters of the main portal vein (MPV), SV and SMV were significantly larger in the Cirrhosis Group (P < 0.05). Conclusion: The IMV and its branches can be depicted well by 3D DCE MRV. The most common insertion of the IMV is into the splenic vein. A minority of patients with cirrhosis had dilatation of the IMV.

Zhang Xiaoming [Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Wenhua Road 63, Nanchong, Sichuan 637000 (China)], E-mail: zhangxm@nsmc.edu.cn; Zhong Tangli [Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Wenhua Road 63, Nanchong, Sichuan 637000 (China)], E-mail: zhongtls@163.com; Zhai Zhaohua [Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Wenhua Road 63, Nanchong, Sichuan 637000 (China)], E-mail: zhaizhaohuada@163.com; Zeng Nanlin [Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Wenhua Road 63, Nanchong, Sichuan 637000 (China)], E-mail: znl99@163.com

2007-10-15

270

MDCT of inferior mesenteric vein: normal anatomy and pathology  

Energy Technology Data Exchange (ETDEWEB)

Multidetector computed tomography (MDCT) is a useful technique for imaging the inferior mesenteric vein. The aim of the present review was to discuss the normal anatomy and the pathologies of the inferior mesenteric vein, including partial or total thrombosis secondary to inflammation (pyophlebitis) and malignancy, occlusion, dilatation and reversed flow, which are rarely encountered. Optimal reconstruction techniques are also discussed. The pathologies of the inferior mesenteric vein can be clearly demonstrated using MDCT using curved-planar reformatted multiplanar reconstruction (MPR) and minimum intensity projection (MIP) images.

Akpinar, E.; Turkbey, B. [Department of Radiology, Hacettepe University School of Medicine, Ankara (Turkey); Karcaaltincaba, M. [Department of Radiology, Hacettepe University School of Medicine, Ankara (Turkey)], E-mail: musturayk@yahoo.com; Karaosmanoglu, D.; Akata, D. [Department of Radiology, Hacettepe University School of Medicine, Ankara (Turkey)

2008-07-15

271

MDCT of inferior mesenteric vein: normal anatomy and pathology  

International Nuclear Information System (INIS)

Multidetector computed tomography (MDCT) is a useful technique for imaging the inferior mesenteric vein. The aim of the present review was to discuss the normal anatomy and the pathologies of the inferior mesenteric vein, including partial or total thrombosis secondary to inflammation (pyophlebitis) and malignancy, occlusion, dilatation and reversed flow, which are rarely encountered. Optimal reconstruction techniques are also discussed. The pathologies of the inferior mesenteric vein can be clearly demonstrated using MDCT using curved-planar reformatted multiplanar reconstruction (MPR) and minimum intensity projection (MIP) images

272

Hypercementosis and concrescence of maxillary second molar with third molar: a case report and review of literature.  

Science.gov (United States)

Concrescence signifies a rare developmental alteration, most commonly in maxillary molars,where two fully formed teeth with separate root canal structures are fused with cementum. Clinical detection is difficult due to lack of enamel involvement and radiographic detection may be challenging, as two dimensional images may be misdiagnosed as overlap, superimposition or close proximity of roots. Such a developmental anomaly can influence treatment outcomes for extraction, endodontic, periodontic, prosthodontic and orthodontic treatment. Legal complications could arise due to unexpected difficulties following treatment. Awareness of occurrence, incidence and post treatment implications of such anomalies is paramount for both the patient and clinician's benefit. This article discusses a case report of concrescence between two maxillary molar teeth and its management. PMID:24984682

Mohan, Bhavya

2014-06-01

273

Endodontic Treatment of a Maxillary Second Molar with Developmental Anomaly: A Case Report  

OpenAIRE

Fusion is a rare occurrence in molar teeth. The purpose of this rare case presentation is to describe the nonsurgical endodontic treatment of maxillary molar. A 28-year-old patient was referred for endodontic treatment of her chronic apical abscess of right maxillary second molar. In the clinical examination, a sinus tract adjacent to involved tooth and a small crown of supernumerary tooth fused to the buccal surface of the molar at gingival margin was observed. Endodontic treatment was decid...

Asgary, Saeed

2007-01-01

274

Endodontic Treatment of a Mandibular Second Molar with Two Mesial Roots: Report of a Case  

OpenAIRE

A case of unusual root morphology is presented to demonstrate anatomic variations in mandibular second molars. The most common configuration of mandibular second molar is to have two roots with three root canals; however mandibular molars may have many different combinations. Endodontic therapy was performed in a mandibular second molar with 3 separate roots 2 located mesially and one distally. Radiographically all 3 root canals terminated with individual foramina. Three orifices or 3 indepen...

Ravanshad, Shohreh; Nabavizade, Mohammad Reza

2008-01-01

275

Strategies used to inhibit postoperative swelling following removal of impacted lower third molar  

OpenAIRE

Postoperative swelling following different surgical strategies is an area of great interest. The main part of literature on the topic deals with swelling after extraction of low impacted third molar. In this review, we have analyzed publications of the last 20 years with a pubmed search using the following key words: impacted third molar, swelling third molar, wisdom tooth, edema jaw, corticosteroids and extraction third molar, antibiotic prophylaxis and tooth extraction. Attention has often ...

Sortino, Francesco; Cicciu?, Marco

2011-01-01

276

Roentgenographic studies on the growth and development of lower third molars in Korean female  

International Nuclear Information System (INIS)

The author obtained the following results through the studies on 1012 roentgenograms of lower third molar regions of Korean female; 1. The rate of presence of lower third molars was 78.9 percent. 2. The period that crowns of lower third molars become completed was 16.1 years. 3. The period that completion of apices of lower third molars become completed was over 27 years.

277

Relationship between mandibular condyle and angle fractures and the presence of mandibular third molars  

Science.gov (United States)

Objectives We retrospectively evaluated the impact of mandibular third molars on the occurrence of angle and condyle fractures. Materials and Methods This was a retrospective investigation using patient records and radiographs. The sample set consisted of 440 patients with mandibular fractures. Eruption space, depth and angulation of the third molar were measured. Results Of the 144 angle fracture patients, 130 patients had third molars and 14 patients did not. The ratio of angle fractures when a third molar was present (1.26 : 1) was greater than when no third molar was present (0.19 : 1; odds ratio, 6.58; P<0.001). Of the 141 condyle fractures patients, the third molar was present in 84 patients and absent in 57 patients. The ratio of condyle fractures when a third molar was present (0.56 : 1) was lower than when no third molar was present (1.90 : 1; odds ratio, 0.30; P<0.001). Conclusion The increased ratio of angle fractures with third molars and the ratio of condyle fractures without a third molar were statistically significant. The occurrence of angle and condyle fractures was more affected by the continuity of the cortical bone at the angle than by the depth of a third molar. These results demonstrate that a third molar can be a determining factor in angle and condyle fractures. PMID:25741462

Mah, Deuk-Hyun; Moon, Seong-Yong; Oh, Ji-Su; You, Jae-Seek

2015-01-01

278

Sub-10-Minute Characterization of an Ultrahigh Molar Mass Polymer by Multi-detector Hydrodynamic Chromatography  

Science.gov (United States)

Molar mass averages, distributions, and architectural information of polymers are routinely obtained using size-exclusion chromatography (SEC). It has previously been shown that ultrahigh molar mass polymers may experience degradation during SEC analysis, leading to inaccurate molar mass averages a...

279

Vertical bone growth following autotransplantation of the developing maxillary third molar to replace a retained mandibular permanent molar: a case report.  

Science.gov (United States)

A retained permanent mandibular first molar caused arrested development and a defect of the alveolar bone in a 16-year-old girl. Extraction of the ankylosed tooth was immediately followed by autotransplantation of the developing maxillary third molar. At the 3-year follow-up examination the interproximal bone level at the autotransplanted molar was equal to that of the neighboring teeth. Cone beam computed tomography showed bone at the labial aspect of the transplant. The eruption of the autotransplanted tooth stimulated vertical alveolar bone development and repaired the bone defect. Additionally, there was closure of the posterior open bite that was initially present at the ankylosed molar site. PMID:25171037

Plakwicz, Pawe?; Czochrowska, Ewa Monika; Milczarek, Anna; Zadurska, Malgorzata

2014-01-01

280

The medial and inferior calcaneal nerves: an anatomic study.  

Science.gov (United States)

The existence of chronic heel pain induced by the compression of nerves prompted us to conduct an anatomic study of the innervation of the heel. Fifteen cadaver feet were dissected to investigate the origin, course and branches of the medial calcaneal nerve (MCN) and the inferior calcaneal nerve (ICN). Despite a variable origin (tibial n. (TN) or lateral plantar n. (LPN)), the medial calcaneal nerve branches which lay superficial to the abductor hallucis muscle (AH) were quite constant. The medial calcaneal nerve gave branches to the abductor hallucis muscle and innervated the posterior part of the medial face of the heel. It terminated in the superficial heel pad at the inferior part of the heel. In our study, the inferior calcaneal nerve always originated from the lateral plantar nerve. Its relationship to the deep fascia of the abductor hallucis muscle and anterior tubercle of calcaneus may explain the entrapment syndrome of the inferior calcaneal nerve. PMID:10431329

Louisia, S; Masquelet, A C

1999-01-01

281

Inferior alveolar nerve sensitivity changes after mandibular trauma  

Directory of Open Access Journals (Sweden)

Full Text Available The investigation was performed on 195 patients, who had fracture on mandibular angle zone. In control group pain thresholds of infraorbital nerve and inferior alveolar nerve did not differ significantly (p > 0.05. Consequently, lesion degree of inferior alveolar nerve and its functional recovery dynamics were estimated objectively according to pain threshold and lesion index of neural function. Stump dislocation extent has influence on neural lesion: the more expressed dislocation, the higher likelihood of severe lesion of inferior alveolar nerve. Three degrees of neural lesion were identified in the case of mandibular angle fracture. When minor lesion of inferior alveolar nerve took place (17.4%, sensation recovered in 21 days after stump reposition and fixation; moderate lesion of nerve (55.8% had sensory recovery after 28 days, and in the case of severe lesion of nerve (26.6% neural function did not recover even after 90 days.

Simonas Grybauskas

2010-12-01

282

Inferior vena cava filter penetration into right proximal ureter.  

Science.gov (United States)

Inferior vena cava (IVC) filter penetration into the renal collecting system is an infrequent event. We report a case of IVC filter penetration into the right proximal ureter resulting in gross hematuria, hydronephrosis and stone formation. PMID:24529023

Sherman, Christopher M; Rao, Sandhya R; Talluri, Sriharsha; Dwivedi, Amit J; Ankem, Murali K

2014-02-01

283

A basic review on the inferior alveolar nerve block techniques  

OpenAIRE

The inferior alveolar nerve block is the most common injection technique used in dentistry and many modifications of the conventional nerve block have been recently described in the literature. Selecting the best technique by the dentist or surgeon depends on many factors including the success rate and complications related to the selected technique. Dentists should be aware of the available current modifications of the inferior alveolar nerve block techniques in order to effectively choose b...

Khalil, Hesham

2014-01-01

284

Inferior alveolar nerve sensitivity changes after mandibular trauma  

OpenAIRE

The investigation was performed on 195 patients, who had fracture on mandibular angle zone. In control group pain thresholds of infraorbital nerve and inferior alveolar nerve did not differ significantly (p > 0.05). Consequently, lesion degree of inferior alveolar nerve and its functional recovery dynamics were estimated objectively according to pain threshold and lesion index of neural function. Stump dislocation extent has influence on neural lesion: the more expressed dislocation, the high...

Simonas Grybauskas; Algirdas Lukosiunas; Gintautas Sabalys; Ricardas Kubilius; Dainius Razukevicius

2010-01-01

285

Arched Needle Technique for Inferior Alveolar Mandibular Nerve Block  

OpenAIRE

One of the most commonly used local anesthetic techniques in dentistry is the Fischer’s technique for the inferior alveolar nerve block. Incidentally this technique also suffers the maximum failure rate of approximately 35–45%. We studied a method of inferior alveolar nerve block by injecting a local anesthetic solution into the pterygomandibular space by arching and changing the approach angle of the conventional technique and estimated its efficacy. The needle after the initial insertio...

Chakranarayan, Ashish; Mukherjee, B.

2011-01-01

286

Management of primary rhegmatogenous retinal detachment with inferior breaks  

OpenAIRE

Background: Rhegmatogenous retinal detachments (RRD) with inferior breaks are usually treated by scleral buckling (SB) or pars plana vitrectomy (PPV) or a combination of both methods. However, applying a SB during PPV may produce a risk of choroidal haemorrhage. Following a recent pilot study showing that such cases can be safely treated by PPV without SB the authors re-examined their management of RRD in which inferior breaks were present.

Sharma, A.; Grigoropoulos, V.; Williamson, T. H.

2004-01-01

287

Penetrating injuries of the abdominal inferior vena cava.  

OpenAIRE

This is a retrospective study of 74 patients with penetrating injuries of the abdominal inferior vena cava; the cause of injury was gunshot in 91% and stabbing in 9%. Of the patients, 77% underwent lateral venorrhaphy, 5% underwent infrarenal ligation of the inferior vena cava (IVC), and 18% died perioperatively before any caval repair could be carried out. There was an overall perioperative mortality of 39%. Persistent shock, the site of the venous injury, particularly in the retrohepatic po...

Degiannis, E.; Velmahos, G. C.; Levy, R. D.; Souter, I.; Benn, C. A.; Saadia, R.

1996-01-01

288

Opioid modulation of GABA release in the rat inferior colliculus  

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Full Text Available Abstract Background The inferior colliculus, which receives almost all ascending and descending auditory signals, plays a crucial role in the processing of auditory information. While the majority of the recorded activities in the inferior colliculus are attributed to GABAergic and glutamatergic signalling, other neurotransmitter systems are expressed in this brain area including opiate peptides and their receptors which may play a modulatory role in neuronal communication. Results Using a perfusion protocol we demonstrate that morphine can inhibit KCl-induced release of [3H]GABA from rat inferior colliculus slices. DAMGO ([D-Ala(2, N-Me-Phe(4, Gly(5-ol]-enkephalin but not DADLE ([D-Ala2, D-Leu5]-enkephalin or U69593 has the same effect as morphine indicating that ? rather than ? or ? opioid receptors mediate this action. [3H]GABA release was diminished by 16%, and this was not altered by the protein kinase C inhibitor bisindolylmaleimide I. Immunostaining of inferior colliculus cryosections shows extensive staining for glutamic acid decarboxylase, more limited staining for ? opiate receptors and relatively few neurons co-stained for both proteins. Conclusion The results suggest that ?-opioid receptor ligands can modify neurotransmitter release in a sub population of GABAergic neurons of the inferior colliculus. This could have important physiological implications in the processing of hearing information and/or other functions attributed to the inferior colliculus such as audiogenic seizures and aversive behaviour.

Forge Andrew

2004-09-01

289

Mandibular third molar development after mantle radiation in long-term survivors of childhood Hodgkin's disease  

International Nuclear Information System (INIS)

Sequential panoramic radiographs were assessed for mandibular third molar development in 47 long-term survivors of childhood Hodgkin's disease after treatment with 37 Gy mantle field radiation. To make a comparison, panoramic radiographs of 149 healthy, nonirradiated children were reviewed for the presence of mandibular third molars. In children between the ages of 7 and 12 years, bilateral agenesis of mandibular third molars was more frequent in patients who had been treated with mantle radiation than in nonirradiated patients. Unilateral agenesis, crown hypoplasia, and root growth impairment of mandibular third molars were also found. Similar, apparent, radiation-induced developmental anomalies were noted in maxillary third molars of the irradiated patients

290

A Case of Blunt Trauma of the Eyeball Associated With an Inferior Oblique Muscle and an Inferior Rectus Muscle Rupture.  

Science.gov (United States)

Rupture of the extraocular muscle in the absence of significant injury to the eyeball and adnexa is uncommon. The authors report a case of blunt trauma of the eyeball associated with an inferior oblique muscle and an inferior rectus muscle rupture. A 55-year-old man slipped and fell down hitting his eye on an extended windshield wiper blade. Although he had treatment in the emergency room, he complained of diplopia in the primary position 1 day postoperatively. After noticing ruptures of the inferior oblique muscle and an inferior rectus muscle during exploratory surgery, the authors carefully repaired it. Diplopia in the primary position had disappeared within 1 month after the operation and by 6 months postoperatively. The movement of the eye had almost completely recovered. PMID:25210874

Nitta, Keisuke; Kashima, Tomoyuki; Miura, Fumihide; Hiroe, Takashi; Akiyama, Hideo; Kishi, Shoji

2014-09-10

291

Experimental benchmark value for the molar polarizability of neon  

Science.gov (United States)

With dielectric-constant gas thermometry (DCGT), the molar polarizability of neon has been determined with a relative standard uncertainty of about 11 parts in 106 (11 ppm). A series of isotherms using helium and neon as measuring gas have been taken and the ab initio value for the polarizability of helium has been used to achieve this unprecedented level of uncertainty. The result of AepsilonDCGTNe=9.94727×10-7 m3/mol agrees with the latest theoretical calculation on the level of a few parts in 104, but shows a relative deviation from the existing (experimental) reference value of several parts in 103.

Gaiser, C.; Fellmuth, B.

2010-06-01

292

A new spectrometer to measure the molar Planck constant  

OpenAIRE

The SI-unit kilogram is scheduled to be re-defined within the next years. In the attempt to link it to a fundamental constant of nature – namely the Planck constant or the Avogadro constant – some discrepancies appeared. A direct determination of the molar Planck constant helps to trace this discrepancy. Such a determination can be done with the gamma-spectrometer Gams, that exists at the ILL. However, the instrument is not stable enough to provide the required accuracy of 2×10^(?8) (r...

Krempel, Jochen

2011-01-01

293

Anesthetic management in thyroid crisis triggered by molar pregnancy  

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Full Text Available Clinical thyrotoxicosis is one of the rare complications of molar pregnancy. The cause of the symptoms associated with hyperthyroidism in mol hydatiform is the thyrotrophic effects of high levels of ?-hCG. The hCG molecule consists of ? and ? subunits; the ? subunit is identical to TSH and the ? subunit has a similar structure to TSH. In this case report it was aimed to discuss the anesthetic management of a dilatation and curettage case in a patient with mol hydatiform and thyroid crisis. J Clin Exp Invest 2012; 3 (3: 433-434Key words: Hydatidiform mole, hyperthyroidism, anesthesia

Harun Aydo?an

2012-09-01

294

Absence of Inferior Gluteal Artery: A Rare Observation Ausencia de la Arteria Glútea Inferior: Una Rara Observación  

OpenAIRE

The gluteal region is an important anatomical and clinical area which contains muscles and vital neurovascular bundles. They are important for their clinical and morphological reasons. In this manuscript we report a rare case of absence of inferior gluteal artery. In the same specimen the superior gluteal artery was taking origin from the anterior division of internal iliac artery. The structures normally supplied by the inferior gluteal artery were supplied by a branch coming from the superi...

Sreenivasulu Reddy; Venkata Ramana  Vollala; Mohandas Rao

2007-01-01

295

Compensation trends of the angulation of first molars: retrospective study of 1403 malocclusion cases.  

Science.gov (United States)

We investigated the compensatory trends of mesiodistal angulation of first molars in malocclusion cases. We compared differences in the angulation of first molars in different developmental stages, malocclusion classifications and skeletal patterns. The medical records and lateral cephalogrammes of 1403 malocclusion cases taken before treatment were measured to evaluate compensation of molar angulation in relation to the skeletal jaw. The cases were stratified by age, Angle classification and skeletal patterns. Differences in the mesiodistal angulation of the first molars were compared among the stratifications. We observed three main phenomena. First, angulation of the upper first molar varied significantly with age and tipped most distally in cases aged 16 years. The lower first molar did not show such differences. Second, in Angle Class II or skeletal Class II cases, the upper first molar was the most distally tipped, the lower first molar was the most mesially tipped, and opposite angulation compensation was observed in Class III cases. Third, in high-angle cases, the upper and lower first molars were the most distally tipped, and opposite angulation compensation was observed in low-angle cases. These data suggest that the angulation of the molars compensated for various growth patterns and malocclusion types. Hence, awareness of molar angulation compensation would help to adjust occlusal relationships, control anchorage and increase the chances of long-term stability. PMID:24699185

Su, Hong; Han, Bing; Li, Sa; Na, Bin; Ma, Wen; Xu, Tian-Min

2014-09-01

296

GABAA receptor binding in the aging rat inferior colliculus.  

Science.gov (United States)

The inhibitory neurotransmitter GABA has been shown to be critically involved in shaping neuronal responses to simple and complex acoustic stimuli in the inferior colliculus. Studies in the rat and human inferior colliculus have suggested significant changes in functions related to GABA neurotransmission occur in the aged. These changes include significant decreases in GABA content, GABA release, GABA neurons, glutamate decarboxylase enzymatic activity, and GABAB receptor binding. Such changes within the inferior colliculus may affect the ability of elderly listeners to process complex acoustic signals, particularly in the presence of background noise. The present study was designed to examine the regional distribution and effects of aging on GABAA receptor binding sites in the Fischer 344 rat inferior colliculus using in vitro quantitative receptor autoradiography. [3H]GABA binding to GABAA receptors was significantly reduced in the inferior colliculus of young adult (3 months) and aged (18-26 months) rats when compared to 2-month animals. However, no significant changes were observed after 3 months of age. Single concentrations of tritiated GABAA receptor ligands (muscimol, t-butylbicycloorthobenzoate, and flunitrazepam) revealed no significant age-related changes in receptor binding in the inferior colliculus between 3 and 26 months of age. To characterize further the pharmacology of the GABAA receptor in the inferior colliculus, GABA modulation of the picrotoxin binding site was examined using [3H]t-butylbicycloorthobenzoate. When increasing concentrations of GABA were added to the incubation buffer, a significant decrease in binding was observed in the inferior colliculus of rats in each age group. In aged rats, the dose-response curve was shifted to the left, indicating an increase in the potency of GABA to inhibit [3H]t-butylbicycloorthobenzoate binding. Although no changes in GABAA receptor binding were detected in the inferior colliculus after 3 months of age, a significant alteration in interaction between the GABA and picrotoxin binding sites was observed in the inferior colliculus of aged rats when compared to 3-month-old young adults. This difference appears to reflect an increased sensitivity of the receptor to GABA modulation in aged rats and, thus, may serve as a compensatory mechanism to enhance GABAA receptor function in response to a presynaptic loss of inhibition. PMID:8783261

Milbrandt, J C; Albin, R L; Turgeon, S M; Caspary, D M

1996-07-01

297

Morphological Alterations of the Surfaces of Enamel and Dentin of Deciduous Teeth Irradiated with Nd:YAG, C0(2and Diode Lasers Alteraciones Morfológicas de las Superficies de Esmalte y Dentina de Dientes Deciduos Irradiados con Láseres de Nd:YAG, C0(2 y Diodo  

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Full Text Available In this work, we studied the effects of C0(2, Nd:YAG and diode lasers on the enamel and dentin of deciduous human teeth. After the irradiations, the samples were duly prepared and set up on metallic bases, covered with gold and examined in the scanning electron microscope. The results showed that the irradiation with the C0(2 mode locked laser with 1.0 W power caused melting and irregularities with small cavities on the surface of the enamel. The irradiated area on the dentin surface appeared circular and well delimited, containing blocks of dentin and cracks. By using the pulsed Nd:YAG laser with 1.0 W mean power and 10 Hz frequency, the enamel surface presented granules of molten enamel, with a typical melting look. The irradiated dentin surface presented a cavity with a margin elevated with granules and holes, and its bottom presented dentinary tubules with globules of melted dentin. Irradiation with the mode locked of diode laser with 1.0 W mean power, showed the formation of a melted and evenly resolidified enamel surface, and the dentin surface presented a block of melted dentin with adjacent regions of normal dentin, evidently with a relatively smooth surface.El estudio presenta algunos resultados del efecto del láser de C0(2, Nd:YAG y Diodo sobre el esmalte y dentina de dientes deciduos humanos. Después de las irradiaciones, se prepararon las muestras y se montaron sobre bases metálicas, cubiertas con oro y examinadas en el microscopio electrónico de barrido. Los resultados mostraron que la irradiación con el láser C0(2 en modo conmutado con 1,0 W de potencia, provoca fusión e irregularidades con pequeños cráteres en la superficie del esmalte. En la superficie de la dentina, el área irradiada se mostró circular y bien definido, con bloques de dentina y grietas. Con el uso del láser Nd: YAG en el modo pulsado con 1,0 W de potencia media y frecuencia de 10Hz, la superficie del esmalte presentó granulos de esmalte fundido, dándole el aspecto de "melting" (derretido. La superficie de dentina irradiada presentó un cráter con borde elevado con granulos y agujeros, y su fondo presentó túbulos dentinarios con glóbulos de dentina derretida. La irradiación del láser de Diodo en el modo conmutado con potencia media de 1,0 W, provocó la formación de una superficie de esmalte fusionada y resolidificada uniforme y la superficie de la dentina presentó un bloque de dentina fundida en la regiones adyacentes de dentina normal, mostrando una superficie bastante lisa.

Mónica Rodrigues de Souza

2009-06-01

298

Morphological Alterations of the Surfaces of Enamel and Dentin of Deciduous Teeth Irradiated with Nd:YAG, C0(2)and Diode Lasers / Alteraciones Morfológicas de las Superficies de Esmalte y Dentina de Dientes Deciduos Irradiados con Láseres de Nd:YAG, C0(2) y Diodo  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish El estudio presenta algunos resultados del efecto del láser de C0(2), Nd:YAG y Diodo sobre el esmalte y dentina de dientes deciduos humanos. Después de las irradiaciones, se prepararon las muestras y se montaron sobre bases metálicas, cubiertas con oro y examinadas en el microscopio electrónico de b [...] arrido. Los resultados mostraron que la irradiación con el láser C0(2) en modo conmutado con 1,0 W de potencia, provoca fusión e irregularidades con pequeños cráteres en la superficie del esmalte. En la superficie de la dentina, el área irradiada se mostró circular y bien definido, con bloques de dentina y grietas. Con el uso del láser Nd: YAG en el modo pulsado con 1,0 W de potencia media y frecuencia de 10Hz, la superficie del esmalte presentó granulos de esmalte fundido, dándole el aspecto de "melting" (derretido). La superficie de dentina irradiada presentó un cráter con borde elevado con granulos y agujeros, y su fondo presentó túbulos dentinarios con glóbulos de dentina derretida. La irradiación del láser de Diodo en el modo conmutado con potencia media de 1,0 W, provocó la formación de una superficie de esmalte fusionada y resolidificada uniforme y la superficie de la dentina presentó un bloque de dentina fundida en la regiones adyacentes de dentina normal, mostrando una superficie bastante lisa. Abstract in english In this work, we studied the effects of C0(2), Nd:YAG and diode lasers on the enamel and dentin of deciduous human teeth. After the irradiations, the samples were duly prepared and set up on metallic bases, covered with gold and examined in the scanning electron microscope. The results showed that t [...] he irradiation with the C0(2) mode locked laser with 1.0 W power caused melting and irregularities with small cavities on the surface of the enamel. The irradiated area on the dentin surface appeared circular and well delimited, containing blocks of dentin and cracks. By using the pulsed Nd:YAG laser with 1.0 W mean power and 10 Hz frequency, the enamel surface presented granules of molten enamel, with a typical melting look. The irradiated dentin surface presented a cavity with a margin elevated with granules and holes, and its bottom presented dentinary tubules with globules of melted dentin. Irradiation with the mode locked of diode laser with 1.0 W mean power, showed the formation of a melted and evenly resolidified enamel surface, and the dentin surface presented a block of melted dentin with adjacent regions of normal dentin, evidently with a relatively smooth surface.

Mónica Rodrigues de, Souza; Ii-Sei, Watanabe; Luciane H, Azevedo; Edgar Y, Tanji.

2009-06-01

299

Extração de incisivo inferior: uma opção terapêutica Mandibular incisor extraction: a terapeutic option  

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Full Text Available O planejamento ortodôntico em casos de apinhamento, normalmente oscila entre não extração e extrações de quatro pré-molares. Em determinadas situações a escolha por uma alternativa ou outra pode provocar conseqüências negativas. A extração de um incisivo inferior em casos bem selecionados é uma abordagem eficiente, pouco explorada na literatura. Entretanto, para sua correta indicação o ortodontista precisa conhecer as variáveis que envolvem este tipo de terapia. O objetivo deste trabalho é abordar de maneira sistemática os diversos aspectos clínicos relacionados com esta modalidade terapêutica, ilustrando sua aplicabilidade com a apresentação de casos clínicos.The orthodontic treatment strategy in crowded cases has usually been oscillated among no extraction and premolars' extractions. In certain situations the choice for an alternative or another would bring negative consequences. The extraction of a lower incisor in well selected cases represents an efficient approach, although little attention has been given to this kind of therapy in the literature. However, the correct indication must be evaluated by the orthodontist, who needs to know the peculiarities related to this treatment modality. In this sense, the aim of this work is to approach in a systematic way the several clinical aspects related with this therapeutic modality, illustrating its applicability through the presentation of treated cases.

Camilo Massa Ferreira Lima

2005-08-01

300

Extração de incisivo inferior: uma opção terapêutica / Mandibular incisor extraction: a terapeutic option  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese O planejamento ortodôntico em casos de apinhamento, normalmente oscila entre não extração e extrações de quatro pré-molares. Em determinadas situações a escolha por uma alternativa ou outra pode provocar conseqüências negativas. A extração de um incisivo inferior em casos bem selecionados é uma abor [...] dagem eficiente, pouco explorada na literatura. Entretanto, para sua correta indicação o ortodontista precisa conhecer as variáveis que envolvem este tipo de terapia. O objetivo deste trabalho é abordar de maneira sistemática os diversos aspectos clínicos relacionados com esta modalidade terapêutica, ilustrando sua aplicabilidade com a apresentação de casos clínicos. Abstract in english The orthodontic treatment strategy in crowded cases has usually been oscillated among no extraction and premolars' extractions. In certain situations the choice for an alternative or another would bring negative consequences. The extraction of a lower incisor in well selected cases represents an eff [...] icient approach, although little attention has been given to this kind of therapy in the literature. However, the correct indication must be evaluated by the orthodontist, who needs to know the peculiarities related to this treatment modality. In this sense, the aim of this work is to approach in a systematic way the several clinical aspects related with this therapeutic modality, illustrating its applicability through the presentation of treated cases.

Camilo Massa Ferreira, Lima; Eduardo, Lacet; Candice Ramos, Marques.

2005-08-01

301

Image analysis of the eruptive positions of third molars and adjacent second molars as indicators of age evaluation in Thai patients  

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This study was performed to determine the relationship between the stage of tooth eruption (both vertical and mesio-angular) and chronological age. Indirect digital panoramic radiographs were used to measure the distances from the dentinoenamel junction (DEJ) of the second molars to the occlusal plane of the second molar teeth and of the adjacent third molars in 264 Thai males and 437 Thai females using ImageJ software. The ratio of those distances was calculated by patient age, and the correlation coefficient of the ratio of the third molar length to the second molar length was calculated. The correlation between the height of the vertically erupted upper third molar teeth and age was at the intermediate level. The age range of ?15 to <16 years was noted to be the range in which the correlation between the chronological age determined from the eruptional height and actual chronological age was statistically significant. The mean age of the female subjects, in which the position of the right upper third molar teeth was at or above the DEJ of the adjacent second molar but below one half of its coronal height was 19.9±2.6 years. That for the left side was 20.2±2.7 years. The mean ages of the male subjects were 20.1±3.3 years and 19.8±2.7 years for the right and left sides, respectively. It might be possible to predict chronological age from the eruption height of the wisdom teeth.

Mahasantipiya, Phattaranant May; Pramojanee, Sakarat; Thaiupathump, Trasapong [Chiang Mai University, Chiang Mai (Thailand)

2013-12-15

302

Replantation of a maxillary second molar after removal of a third molar with a dentigerous cyst: Case report and 12-month follow-up.  

Science.gov (United States)

The aim of this study was to describe the replantation of a maxillary second right molar, which had been removed for surgical reasons in order to remove a dentigerous cyst associated with the adjacent third molar, and the case's 12-month follow-up. A 51-year-old man presented swelling in the right maxillary area. Radiographic examination showed a large radiolucency in close proximity to the third molar, suggesting a follicular cyst. The third molar was extracted and the cyst underwent curettage. The second molar had to be extracted to enable complete removal of the cyst and to achieve primary closure of the wound, which would have been impossible without repositioning the molar. With this objective, extraoral endodontic treatment was performed, the root-end was resected and prepared with ultrasonic retrotips, and root-end filling was accomplished with MTA before the molar was replanted. At the 12-month follow-up, the tooth showed no clinical signs or symptoms, probing depth was no greater than 3 mm and radiographic examination showed no evidence of root resorption or periapical lesion. Key words:Replantation, maxillary molar, follicular cyst, dentigerous cyst. PMID:24790721

Peñarrocha-Diago, María A; Aloy-Prósper, Amparo; Peñarrocha-Oltra, David; Peñarrocha-Diago, Miguel

2014-04-01

303

Immunocytochemical and molecular studies with primary cultures of molar tissue Estudio inmunocitoquímico y molecular de cultivo primario de tejido molar  

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Full Text Available Introduction. Gestational trophoblastic disease includes a group of pathologies characterized by abnormal trophoblast growth and invasion. The molecular bases of the disease are largely unknown, due in part to the lack of appropriate biological models. The insulin-like growth factor (IGF system plays a fundamental role in the growth and development of many tissues and is involved in the progression of several diseases.
Objectives. Primary cell cultures derived from first trimester placenta were characterized from patients with complete hydatidiform mole and spontaneous non molar abortion by immunocytochemical and molecular methods.
Materials and Methods. The immunocytochemical method used specific markers for trophoblastic cells, whereas RT-PCR was used to identify insulin-like growth factor gene expression.
Results. Histochemical staining with hematoxilin-eosin revealed that the cultures contained heterogeneous cell types, including trophoblast and endometrial decidual cells. The ratio of trophoblast cells in the cultures varied between 16% and 37%, as detected by cytokeratine-7 as the specific trophoblast marker. Gene expression analysis corroborated the presence of trophoblasts by detecting insulin-like growth factor II mRNA, whereas GH-V transcripts were correlated with the presence of syncitiotrophoblasts. Insulin-like growth factor I and insulin-like growth factor binding protein 1 mRNAs were related to mesenchyimal and decidual cells, respectively. Higher insulin-like growth factor II expression levels were found in molar tissues in comparison with non-molar abortions.
Conclusion. By combining three methodologies-morphology, immunocytochemistry and gene expression, characterization and follow-up of placenta cultures from abnormal tissues is found to facilitate diagnosis.
Introducción. La enfermedad trofoblástica gestacional comprende un conjunto de patologías caracterizadas por crecimiento e invasión anómalos del trofoblasto. Las bases moleculares de esta patología son desconocidas, en parte por la dificultad para disponer de modelos biológicos adecuados. Se plantea que el sistema de factores de crecimiento similares a la insulina puede tener un papel fundamental en el desarrollo de la enfermedad.
Objetivo. Caracterizar cultivos primarios de placentas de primer trimestre provenientes de pacientes con mola hidatidiforme completa y aborto espontáneo no molar mediante morfología, inmunocitoquímica y expresión diferencial de algunos genes del sistema de factores de crecimiento similares a la insulina.
Materiales y métodos. Se empleó inmunocitoquímica para determinar células trofoblásticas y detección por transcripción reversa y reacción en cadena de la polimerasa de genes del sistema de factores de crecimiento similares a la insulina asociados al tipo celular.
Resultados. La morfología evidenció heterogeneidad de los cultivos, incluidas células mesenquimales, trofoblásticas y de decidua. El contenido de células de trofoblasto con citoqueratina-7 (marcador específico estuvo entre 16 y 37%. La expresión de genes corroboró la presencia de trofoblasto por medio del ARNm del factor II de crecimiento similar a la insulina, en tanto que los transcritos de la hormona de crecimiento variante evidenciaron la presencia de sincitiotrofoblasto. El factor I de crecimiento similar a la insulina y la proteína de unión tipo 1 se relacionaron con células mesenquimales y de decidua. Se observó una mayor expresión del factor II de crecimiento similar a la insulina en tejidos molares en comparación con aborto no molar.
Conclusiones. Los resultados mostraron la utilidad de combinar tres metodologías, morfología, inmunocitoquímica y expresión de genes, como herramient

Myriam Sánchez-Gómez

2006-12-01

304

Estudio inmunocitoquímico y molecular de cultivo primario de tejido molar / Immunocytochemical and molecular studies with primary cultures of molar tissue  

Scientific Electronic Library Online (English)

Full Text Available Introducción. La enfermedad trofoblástica gestacional comprende un conjunto de patologías caracterizadas por crecimiento e invasión anómalos del trofoblasto. Las bases moleculares de esta patología son desconocidas, en parte por la dificultad para disponer de modelos biológicos adecuados. Se plantea [...] que el sistema de factores de crecimiento similares a la insulina puede tener un papel fundamental en el desarrollo de la enfermedad. Objetivo. Caracterizar cultivos primarios de placentas de primer trimestre provenientes de pacientes con mola hidatidiforme completa y aborto espontáneo no molar mediante morfología, inmunocitoquímica y expresión diferencial de algunos genes del sistema de factores de crecimiento similares a la insulina. Materiales y métodos. Se empleó inmunocitoquímica para determinar células trofoblásticas y detección por transcripción reversa y reacción en cadena de la polimerasa de genes del sistema de factores de crecimiento similares a la insulina asociados al tipo celular. Resultados. La morfología evidenció heterogeneidad de los cultivos, incluidas células mesenquimales, trofoblásticas y de decidua. El contenido de células de trofoblasto con citoqueratina-7 (marcador específico) estuvo entre 16 y 37%. La expresión de genes corroboró la presencia de trofoblasto por medio del ARNm del factor II de crecimiento similar a la insulina, en tanto que los transcritos de la hormona de crecimiento variante evidenciaron la presencia de sincitiotrofoblasto. El factor I de crecimiento similar a la insulina y la proteína de unión tipo 1 se relacionaron con células mesenquimales y de decidua. Se observó una mayor expresión del factor II de crecimiento similar a la insulina en tejidos molares en comparación con aborto no molar. Conclusiones. Los resultados mostraron la utilidad de combinar tres metodologías, morfología, inmunocitoquímica y expresión de genes, como herramientas para la caracterización y seguimiento de cultivos placentarios a partir de muestras de tejidos anómalos complejos, facilitando así el diagnóstico. Abstract in english Introduction. Gestational trophoblastic disease includes a group of pathologies characterized by abnormal trophoblast growth and invasion. The molecular bases of the disease are largely unknown, due in part to the lack of appropriate biological models. The insulin-like growth factor (IGF) system pla [...] ys a fundamental role in the growth and development of many tissues and is involved in the progression of several diseases. Objectives. Primary cell cultures derived from first trimester placenta were characterized from patients with complete hydatidiform mole and spontaneous non molar abortion by immunocytochemical and molecular methods. Materials and Methods. The immunocytochemical method used specific markers for trophoblastic cells, whereas RT-PCR was used to identify insulin-like growth factor gene expression. Results. Histochemical staining with hematoxilin-eosin revealed that the cultures contained heterogeneous cell types, including trophoblast and endometrial decidual cells. The ratio of trophoblast cells in the cultures varied between 16% and 37%, as detected by cytokeratine-7 as the specific trophoblast marker. Gene expression analysis corroborated the presence of trophoblasts by detecting insulin-like growth factor II mRNA, whereas GH-V transcripts were correlated with the presence of syncitiotrophoblasts. Insulin-like growth factor I and insulin-like growth factor binding protein 1 mRNAs were related to mesenchyimal and decidual cells, respectively. Higher insulin-like growth factor II expression levels were found in molar tissues in comparison with non-molar abortions. Conclusion. By combining three methodologies-morphology, immunocytochemistry and gene expression, characterization and follow-up of placenta cultures from abnormal tissues is found to facilitate diagnosis.

Yinth Andrea, Bernal; Luis Eduardo, Díaz; Jinneth, Acosta; Cecilia, Crane; Stella, Carrasco-Rodríguez; Antonio José, Bermúdez; Myriam, Sánchez-Gómez.

2006-12-01

305

Innervation of rat molar teeth: II. A quantitative analysis of primary sensory neurons innervating a mandibular molar tooth.  

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This study was conducted to determine the source and number of primary sensory neurons (PSNs) innervating a mandibular molar tooth of a population of 15-18-week-old Sprague-Dawley rats. The pulpal tissue was exposed to horseradish peroxidase (HRP) pellets for 24 hours. Subsequently the animals were perfusion fixed and the following PSN structures were examined for the presence of HRP-labelled cells: trigeminal (TGs) and cervical dorsal root ganglia (DRGs) and mesencephalic nucleus (MN). Only the TGs contained labelled cells and they thus were the sole source of PSN pulpal innervation. The number of TG cells was highly variable, 49-407, but most of this variability was attributable to insufficient HRP filling of the pulp chamber or leakage of HRP into periapical tissue. Selection of TGs whose respective experimental teeth demonstrated that HRP filled and was restricted to the pulp chamber revealed a narrower range of TG cells providing pulpal innervation to the first molars, 142-288, with an average of 213. A detailed mapping of these cells indicated a somatotopic distribution within the mandibular territory of the TGs. It was concluded that these findings represent TG's contribution to the pulpal innervation of this specific population of rat first molar teeth. This suggests that from animal to animal the density of innervation may be quite variable and it is hypothesized that the sensitivity of the pulp would likewise vary. In addition, these findings may contribute to the explanation of why there is variability in the stimulus strength needed to elicit a pain response in the human dentition. PMID:3688472

Aker, F D

1987-10-01

306

Dynamic shear properties of the porcine molar periodontal ligament.  

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The role of the periodontal ligament (PDL) is to support the tooth during function and resist external forces applied to it. The dominant vertical component of these forces is associated with shear in the PDL. Little information, however, is available on the dynamic behavior of the PDL in shear. Therefore, the present study was designed to determine the dynamic shear properties of the PDL in the porcine molar (n=10). From dissected mandibles transverse sections of the mesial root of the first molar were obtained at the apical and coronal levels and used for dynamic shear tests. Shear strain (0.5%, 1.0%, and 1.5%) was applied in superoinferior direction parallel to the root axis with a wide range of frequencies (0.01-100 Hz). The dynamic complex and storage moduli increased significantly with the loading frequency, the dynamic loss modulus showed only a small increase. The dynamic elasticity was significantly larger in the coronal region than in the apical region although the dynamic viscosity was similar in both regions. The present results suggest that non-linearities, compression/shear coupling, and intrinsic viscoelasticity affect the shear material behavior of the PDL, which might have important implications for load transmission from tooth to bone and vice versa. PMID:16949081

Tanaka, Eiji; Inubushi, Toshihiro; Takahashi, Koji; Shirakura, Maya; Sano, Ryota; Dalla-Bona, Diego A; Nakajima, Akira; van Eijden, Theo M G J; Tanne, Kazuo

2007-01-01

307

Biometric study of furcation area of first maxillary molars  

Scientific Electronic Library Online (English)

Full Text Available O presente estudo objetivo analisar biometricamente a distância das entradas das 3 bifurcações do primeiro molar superior até a respectiva raiz oposta e determinar o centro da trifurcação (CT), este o ponto eqüidistante da entrada de cada bifurcação. Trinta e cinco dentes livres de qualquer dano sup [...] erficial e sem raízes fusionadas foram selecionados. As raízes foram incluídas em resina acrílica e seccionadas a partir da linha esmalte-cemento até a porção mais apical usando um disco de diamante. Fatias de 0,45 mm foram obtidas. Com o auxílio de um perfilômetro digital foram determinadas coordenadas de pontos num plano cartesiano. Isto permitiu o cálculo das distâncias desejadas utilizando fórmulas de geometria analítica. Após a análise estatística (Kruskal-Wallis ANOVA test, p Abstract in english The present investigation was designed to study the distance from the 3 bifurcation entrances to their opposite roots, and also the virtual center of the trifurcation (TC), which is equidistant from each bifurcation entrance, of maxillary molars. Thirty-five teeth devoid of any surface damage or fus [...] ed roots were selected. Roots were included in acrylic resin and cross-sectioned at the cementoenamel junction to the apex using a rotary diamond blade and 0.45-mm slices were obtained. A profile projector apparatus was used to obtain the coordinated points on a Cartesian plane, which allowed the calculation of all distances present using analytic geometric formulas. Based on statistical analysis (comparison by Kruskal-Wallis ANOVA test, p

Giuseppe Alexandre, Romito; Francisco Emílio, Pustiglioni.

308

Embarazo ectópico molar tubárico: a propósito de un caso clínico  

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Full Text Available SciELO Chile | Language: Spanish Abstract in spanish Introducción: La incidencia de gestación ectópica es 20/1000 embarazos. La mola hidatiforme ocurre en 1/1000 embarazos. Los casos de mola hidatiforme en embarazos ectópicos albergados en las trompas de Falopio constatados en la literatura mundial son excepcionales. Objetivo: Presentamos un caso clín [...] ico de embarazo ectópico molar tubárico y revisión de la literatura. Conclusión: La enfermedad trofoblástica gestacional asociada a embarazo ectópico es un entidad extremadamente rara que debe tenerse en cuenta por su trascendencia. Abstract in english Introduction: The incidence of ectopic pregnancy is 20/1000 pregnancies. The hidatidyform mole occurs in about 1/1000 pregnancies. The cases of hidatidyform mole in ectopic pregnancies located in the Fallopian tube collected in world literature are exceptional. Objective: We present a clinical case [...] of an ectopic molar pregnancy in the tubes and a literature review. Conclusion: The trophoblastic pregnancy disease associated to an ectopic pregnancy is an extremely rare entity that should be considered because of its transcendence.

Encarnación, Arévalo Reyes; Amelia, Vizcaíno Martínez; María Luisa, Vizoso Pérez; Rafael Enrique, Sotelo Avilés.

309

Nanoparticle counting: towards accurate determination of the molar concentration.  

Science.gov (United States)

Innovations in nanotechnology have brought tremendous opportunities for the advancement of many research frontiers, ranging from electronics, photonics, energy, to medicine. To maximize the benefits of nano-scaled materials in different devices and systems, precise control of their concentration is a prerequisite. While concentrations of nanoparticles have been provided in other forms (e.g., mass), accurate determination of molar concentration, arguably the most useful one for chemical reactions and applications, has been a major challenge (especially for nanoparticles smaller than 30 nm). Towards this significant yet chronic problem, a variety of strategies are currently under development. Most of these strategies are applicable to a specialized group of nanoparticles due to their restrictions on the composition and size range of nanoparticles. As research and uses of nanomaterials are being explored in an unprecedented speed, it is necessary to develop universal strategies that are easy to use and are compatible with nanoparticles of different sizes, compositions, and shapes. This review outlines the theories and applications of current strategies to measure nanoparticle molar concentration, discusses the advantages and limitations of these methods, and provides insights into future directions. PMID:25099190

Shang, Jing; Gao, Xiaohu

2014-11-01

310

Supplemental root in a mandibular first molar: a rarity  

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Full Text Available Anatomic variations are common in human dentition. A clear understanding of these variations is very important for success of endodontic treatment. A dentist should be aware of these anatomic variations as this can affect the treatment outcome. A case of endodontic therapy is presented in which inability to locate an anatomically rare supplemental canal of a three rooted mandibular first molar resulted in treatment failure. A 21-year-old female reported with pain and swelling in relation to lower right first molar. An intra oral periapical radiograph revealed 3 roots; the first canal of the mesial root and a canal of one of the distal roots were found to be treated endodontically, which were infraobturated but the canal of the 2nd distal root had not been treated. The radiograph revealed periapical radiolucency and widening of periodontal space. Prior to starting the endodontic treatment the clinician must be aware of the anatomic variations in tooth pulp morphology and also the importance of preoperative radiographs cannot be underscored.

Poonam Mahajan

2011-03-01

311

A geometric morphometric analysis of hominin upper first molar shape.  

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Recent studies have revealed interesting differences in upper first molar morphology across the hominin fossil record, particularly significant between H. sapiens and H. neanderthalensis. Usually these analyses have been performed by means of classic morphometric methods, including the measurement of relative cusp areas or the angles defined between cusps. Although these studies have provided valuable information for the morphological characterization of some hominin species, we believe that the analysis of this particular tooth could be more conclusive for taxonomic assignment. In this study, we have applied geometric morphometric methods to explore the morphological variability of the upper first molar (M(1)) across the human fossil record. Our emphasis focuses on the study of the phenetic relationships among the European middle Pleistocene populations (designated as H. heidelbergensis) with H. neanderthalensis and H. sapiens, but the inclusion of Australopithecus and early Homo specimens has helped us to assess the polarity of the observed traits. H. neanderthalensis presents a unique morphology characterized by a relatively distal displacement of the lingual cusps and protrusion in the external outline of a large and bulging hypocone. This morphology can be found in a less pronounced degree in the European early and middle Pleistocene populations, and reaches its maximum expression with the H. neanderthalensis lineage. In contrast, modern humans retain the primitive morphology with a square occlusal polygon associated with a round external outline. PMID:17599390

Gómez-Robles, A; Martinón-Torres, M; Bermúdez de Castro, J M; Margvelashvili, A; Bastir, M; Arsuaga, J L; Pérez-Pérez, A; Estebaranz, F; Martínez, L M

2007-09-01

312

Quantitative pixel grey measurement of the “high-risk” sign, darkening of third molar roots: a pilot study  

Science.gov (United States)

Objectives: Our aim was to examine the panoramic darkening of the root, which is a “high-risk” sign, using quantitative measurements of pixel grey values to determine different aetiological backgrounds, namely inferior alveolar nerve (IAN) exposure with or without groove formation of the third molar roots or thinning/fenestration of the lingual cortex (LCTF). Methods: 38 impacted third molars that had been surgically removed and had darkened roots on panoramic radiographs were included in this retrospective case–control study. 15 IAN exposure cases were selected for the case group, and 23 cases with proven lingual cortical thinning or fenestration were chosen for the control group. The mean pixel grey values of selected areas in the dark band (D) and control areas within the same roots (R) were determined with the ImageTool (University of Texas Health Science Center, San Antonio, TX) software. The differences in pixel values (R–D) of the IAN and LCTF groups were analysed using the Mann–Whitney U-test and Pearson's ?2 test. Results: The medians of the R–D pixel values were 45.7 in the IAN group and 34.3 in the LCTF group, whereas the interquartile ranges were 12.0 (IAN) and 18.3 (LCTF) (p < 0.001). The R–D critical value at which the outcomes differed significantly was 38. If the differences in pixel grey values (R–D) were higher than 38, the chance of IAN exposure was approximately 32 times higher than the chance of LCTF (?2 test, p < 0.001; odds ratio, 32.0; 95% confidence interval, 3.5–293.1). Conclusions: The pre-operative prediction of IAN exposure or lingual cortical thinning in cases with “darkening” is possible based on pixel grey measurements of digital panoramic radiographs. PMID:23775927

Szalma, J; Bata, Z; Lempel, E; Jeges, S; Olasz, L

2013-01-01

313

Correlação entre o índice morfológico das coroas dos incisivos inferiores e a estabilidade da correção do apinhamento ântero-inferior Correlation between the morphologic index of crowns of mandibular incisors and stability of correction of mandibular anterior crowding  

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Full Text Available OBJETIVO: investigar até que ponto as dimensões mesiodistais e vestibulolinguais das coroas dos incisivos inferiores contribuem para a estabilidade da correção do apinhamento ântero-inferior. METODOLOGIA: foram avaliados 56 pacientes leucodermas, de ambos os gêneros (27 feminino e 29 masculino, que inicialmente apresentavam má oclusão de Classe I ou de Classe II, divisão 1 (28 cada, tratados com extrações dos quatro primeiros pré-molares e com mecânica Edgewise. Nenhum caso foi submetido a desgastes interproximais durante ou após o tratamento. As medidas foram realizadas nos modelos de estudo obtidos de cada caso nas fases pré, pós-tratamento e pós-contenção, totalizando na avaliação de 168 modelos inferiores. A idade média pré-tratamento foi de 13,23 anos, o tempo de tratamento de 2,11 anos e pós-tratamento foi de 5,12 anos. O índice de irregularidade de Little foi utilizado para quantificar o apinhamento ântero-inferior e o índice de Peck e Peck para mensuração das dimensões mesiodistais e vestibulolinguais dos mesmos. O teste de correlação de Pearson foi utilizado para determinar a significância de correlação entre a morfologia das coroas dos incisivos inferiores e a estabilidade. Secundariamente, investigou-se a presença de dimorfismo entre os gêneros e a existência de diferença entre os dois tipos de má oclusão inicial, em relação à estabilidade da correção do apinhamento ântero-inferior, utilizando o teste t independente. RESULTADOS E CONCLUSÕES: concluiu-se que a morfologia da coroa dos incisivos inferiores apresentou uma fraca correlação com a estabilidade pós-contenção. Nem o gênero dos pacientes, nem o tipo de má oclusão inicial influenciaram na estabilidade da correção do apinhamento ântero-inferior, cinco anos pós-tratamento.AIM: This study investigated the extent to which the mesiodistal and buccolingual dimensions of the crowns of mandibular incisors contribute with the stability of correction of mandibular anterior crowding. METHODS: For that purpose, 56 white patients of both genders (27 females and 29 males were evaluated, who initially presented Class I or Class II division 1 malocclusion (28 patients each, treated with extraction of the four first premolars and edgewise mechanics. No interproximal stripping was performed during or after treatment. Measurements were performed on the dental casts achieved from each case at pretreatment, posttreatment and postretention, adding up to 168 mandibular dental casts. The mean age at pretreatment was 13.23 years, the mean treatment time was 2.11 years and the mean post-retention time was 5.12 years. The Little irregularity index was used to quantify the mandibular anterior crowding, and the Peck and Peck index was applied for measurement of the mesiodistal and buccolingual ratios of the crowns of mandibular incisors. The Pearson correlation test was applied to determine the significance of correlation between the morphology of the crowns of mandibular incisors and stability. Dimorphism between genders and the existence of difference between the two types of initial malocclusion were also investigated by the independent t test. RESULS AND CONCLUSION: Analysis of the results revealed that the morphology of crown of mandibular incisors was not significantly correlated with postretention stability. The gender and type of initial malocclusion also did not influence the stability of correction of mandibular anterior crowding at five years posttreatment.

Renata Cristina Faria Ribeiro de Castro

2007-06-01

314

STUDY ON VARIATIONS OF INFERIOR SEGMENTAL BRANCH OF RENAL ARTERY  

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Full Text Available Background: The segmental arteries of the kidney supply the organ in such a way that, each renal pole receives its own artery while, the anterior portion between the poles is supplied by an upper and lower segmental vessel. These two arteries also include in their territory the lateral edge of the kidney and adjacent to the strip of parenchyma on the dorsal or posterior aspect of the organ. The knowledge of inferior segmental branch of renal artery is very important for surgeries in its distribution area in kidney. Materials and Methods: 100 kidneys (Fifty pairs intact with abdominal aorta were collected from department of Forensic medicine, JSS Medical College and Mysore Medical College. For study of segmental variation Corrosion cast technique method was used. The variations of inferior segmental branch of renal artery were observed and recorded. Results: In present study type I inferior segmental branch of renal artery were found in - 59% cases, type II in - 6% cases, type III in - 28% cases, type IV in - 2% cases. Conclusion: The inferior segmental artery from the anterior division of the renal artery is the commonest event –arising in 59%. This is Type I, the normal type. It arises from the renal artery (28% or from the posterior division (6% or from the aorta (2%. The knowledge of inferior segmental branch of renal artery helpful in kidney transplantation and renal surgery because these type of surgeries success mainly depends on arterial ligations.

Chandragirish S

2014-11-01

315

The effects of inferior olive lesion on strychnine seizure  

International Nuclear Information System (INIS)

Bilateral inferior olive lesions, produced by systemic administration of the neurotoxin 3-acetylpyridine (3AP) produce a proconvulsant state specific for strychnine-induced seizures and myoclonus. We have proposed that these phenomena are mediated through increased excitation of cerebellar Purkinje cells, through activation of glutamate receptors, in response to climbing fiber deafferentation. An increase in quisqualic acid (QA)-displaceable [3H]AMPA [(RS)-alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid] binding in cerebella from inferior olive-lesioned rats was observed, but no difference in [3H]AMPA binding displaced by glutamate, kainic acid (KA) or glutamate diethylester (GDEE) was seen. The excitatory amino acid antagonists GDEE and MK-801 [(+)-5-methyl-10,11-dihydro-5H-dibenzo[a,d]cyclo-hepten-5,10 imine] were tested as anticonvulsants for strychnine-induced seizures in 3AP inferior olive-lesioned and control rats. Neither drug effected seizures in control rats, however, both GDEE and MK-801 produced a leftward shift in the strychnine-seizure dose-response curve in 3AP inferior olive-lesioned rats. GDEE also inhibited strychnine-induced myoclonus in the lesioned group, while MK-801 had no effect on myoclonus. The decreased threshold for strychnine-induced seizures and myoclonus in the 3AP-inferior olive-lesioned rats may be due to an increase in glutamate receptors as suggested by the [3H]AMPA binding datap>3H]AMPA binding data

316

Anterior ST segment depression in acute inferior myocardial infarction as a marker of greater inferior, apical, and posterolateral damage  

International Nuclear Information System (INIS)

The clinical significance of anterior precordial ST segment depression during acute inferior myocardial infarction was evaluated in 67 consecutive patients early after onset of symptoms with gated blood pool scans, thallium-201 perfusion images, and 12-lead ECGs. Patients with anterior ST depression (n = 33) had depressed mean values for left ventricular ejection fraction (54 +/- 2% [mean +/- S.E.M.] vs 59 +/- 2%; p = 0.02), cardiac index (3.1 +/- 0.2 vs 3.6 +/- 0.2 L/m2; p = 0.03), and ratio of systolic blood pressure to end-systolic volume (2.0 +/- 0.1 vs 2.5 +/- 0.3 mm Hg/ml; p = 0.04) compared to patients with no anterior ST depression (n = 34). Patients with anterior ST depression had (1) lower mean wall motion values for the inferior, apical, and inferior posterolateral segments (p less than 0.05) and (2) greater reductions in thallium-201 uptake in the inferior and posterolateral regions (p less than 0.05). However, anterior and septal (1) wall motion and (2) thallium-201 uptake were similar in patients with and without ST depression. Thus, anterior precordial ST segment depression in patients with acute inferior wall myocardial infarction represents more than a reciprocal electrical phenomenon. It identifies patients with more severe wall motion impairment and greater hypoperfusion of the inferior and adjacent segments. The poorer global left ventricular function in these patients is a result of more extensive inferior infarction and not of remote septal or anterior injury

317

Estudo clínico e ultraestrutural pós-turbinectomia inferior parcial Clinical and ultrastructural study after partial inferior turbinectomy  

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Full Text Available O presente trabalho refere-se ao estudo dos resultados clínicos e histológicos obtidos após a turbinectomia inferior parcial (TIP, cirurgia indicada no tratamento da obstrução nasal crônica causada pela hipertrofia das conchas nasais inferiores. MATERIAL E MÉTODOS: Foram estudados vinte pacientes, divididos em dois grupos de dez cada (grupos A e B, submetidos à TIP, associada à septoplastia ou não. Os pacientes foram reavaliados clinicamente e histologicamente (com biópsia das áreas regeneradas das conchas inferiores, em dois períodos pós-operatórios diferentes: um grupo após oito a doze meses (grupo A e outro após dois anos de TIP (grupo B. RESULTADOS: Os resultados clínicos mostraram-se satisfatórios para o alívio da obstrução nasal no grupo A, e insatisfatórios no grupo B. Entretanto, melhores resultados histológicos, com maior recuperação e diferenciação epitelial da mucosa regenerada das conchas inferiores após a TIP foram observados no grupo B, com sua ultraestrutura ciliar normal. CONCLUSÕES: A cirurgia revelou ser eficaz a curto, mas não em médio prazo, apesar da recuperação histológica ter sido importante.We report clinical and histological results obtained after partial inferior turbinectomy (PIT, surgery indicated for the treatment of chronic nasal obstruction. METHODS: Twenty patients were divided into two groups submitted to PIT plus septoplasty and PIT alone. The patients were reassessed clinically and histologically by means of a biopsy of the regenerated areas in the inferior turbinates at two different times after PIT, i.e., after 8 to 12 months (group A and after two years (group B. RESULTS: The clinical results proved to be satisfactory for the relief of nasal obstruction in group A and unsatisfactory in group B. However, better histological results with better recovery and epithelial differentiation of the regenerated mucosa of the inferior turbinates after PIT were observed in group B. CONCLUSION: Surgery proved to be effective on a short-term but not on a long-term basis, and histological recovery did not accompany improvement of clinical signs and symptoms.

Rogério Dutra Bandos

2006-10-01

318

Radiographic evaluation of third molar development in 6 to 24 year olds  

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This study investigated the developmental stages of third molars in relation to chronological age and compared third molar development according to location and gender. A retrospective analysis of panoramic radiographs of 2490 patients aged between 6 and 24 years was conducted, and the developmental stages of the third molars were evaluated using the modified Demirjian's classification. The mean age, standard deviation, minimal and maximal age, and percentile distributions were recorded for each stage of development. A Mann-Whitney U test was performed to test the developmental differences in the third molars between the maxillary and mandibular arches and between genders. A linear regression analysis was used for assessing the correlation between the third molar development and chronological age. The developmental stages of the third molars were more advanced in the maxillary arch than the mandibular arch. Males reached the developmental stages earlier than females. The average age of the initial mineralization of the third molars was 8.57 years, and the average age at apex closure was 21.96 years. The mean age of crown completion was 14.52 and 15.04 years for the maxillary and the mandibular third molars, respectively. The developmental stages of the third molars clearly showed a strong correlation with age. The third molars developed earlier in the upper arch than the lower arch; further, they developed earlier in males than in females.

Jung, Yun Hwa; Cho, Bong Hae [Dept. of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University, Yangsan (Korea, Republic of)

2014-09-15

319

Radiographic evaluation of third molar development in 6 to 24 year olds  

International Nuclear Information System (INIS)

This study investigated the developmental stages of third molars in relation to chronological age and compared third molar development according to location and gender. A retrospective analysis of panoramic radiographs of 2490 patients aged between 6 and 24 years was conducted, and the developmental stages of the third molars were evaluated using the modified Demirjian's classification. The mean age, standard deviation, minimal and maximal age, and percentile distributions were recorded for each stage of development. A Mann-Whitney U test was performed to test the developmental differences in the third molars between the maxillary and mandibular arches and between genders. A linear regression analysis was used for assessing the correlation between the third molar development and chronological age. The developmental stages of the third molars were more advanced in the maxillary arch than the mandibular arch. Males reached the developmental stages earlier than females. The average age of the initial mineralization of the third molars was 8.57 years, and the average age at apex closure was 21.96 years. The mean age of crown completion was 14.52 and 15.04 years for the maxillary and the mandibular third molars, respectively. The developmental stages of the third molars clearly showed a strong correlation with age. The third molars developed earlier in the upper arch than the lower arch; further, they developed earlier in males than in females.

320

Reappraisal of Class II molar relationships diagnosed from the lingual side.  

Science.gov (United States)

The buccal and lingual molar relationships in 459 clinically diagnosed Class II cases and the impact of upper first permanent molar rotation on this classification were assessed. Of the 459 Class II cases, 99 (10.78%) sides exhibited unilateral neutral molar relationship assessed from both the buccal and the lingual aspect. None of the molars exhibiting Class I relationship were rotated. The 175 (19.06%) sides with mild Class II molar relationship from the buccal aspect were all judged to be Class I lingually and 85% of these molars were rotated mesially. In the case of a moderate buccal Class II tendency, 55% of the molars were in a Class I relationship when evaluated from the lingual side, whereas 45% belonged to mild (1st degrees ) Class II with molar rotations present in 81% of the cases. When a severe (3rd degrees ) Class II was present from the buccal side, its corresponding lingual Class II tendencies were accordingly elevated (83% 2nd degrees, 17% 3rd degrees ). Among these cases, the molar rotations occurred in 74% of the cases. The results suggested the upper mesiopalatal cusp as a pivotal axis around which the upper first molar rotated. This cusp occluded most frequently in the central fossa, less frequently in the mesio-triangular fossa and rarely anterior to the mesio-triangular fossa. Rotations that correspond to these types of lingual occlusion were 85, 81 and 74%, respectively. The correlation between buccal and lingual molar relationships and their correlation with molar rotation were all significant (pmolar relationship in Class II cases, expressed by Ycanine relation=1.423+0.47 Xmolar relation (pmolar relationship will allow for a more causally directed correction of Class II molar relationship. PMID:11553091

D, L; B, M

2001-05-01

321

Spiral CT in aplasia of the pre-renal inferior vena cava as a cause of phlebothrombosis from the femoral veins to the inferior vena cava  

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The case report focuses on the computed tomography of the thrombotic okklusion of the inferior vena cava, venae iliacae and femorales communes due to congenital interruption of the prerenal inferior vena cava. The embryology of the abnormality was discussed. (orig.)

322

Pendulum: distalização do molar com simplicidade na confecção e utilização / Pendulum: molar distalization with simplicity on its making and utilization  

Scientific Electronic Library Online (English)

Full Text Available Durante muito tempo, a correção da Classe II baseava-se no uso de ancoragem extrabucal. Atualmente, inúmeros dispositivos trazem a possibilidade de distalização dos molares permanentes superiores, dentre estes o aparelho pêndulo preconizado por Hilgers o qual requer um mínimo de cooperação do pacien [...] te, considerando-se que a falta de colaboração poderá levar ao fracasso o mais bem elaborado plano de tratamento. O objetivo deste trabalho é descrever as características, confecção e indicações do Pêndulo, contando com a ilustração de casos clínicos. Abstract in english Over the time, the correction of Class II has been based on the use of anchorage extraoral traction with the headgear. Nowadays, many devices have been used to give the possibility of distalization of the maxillary permanents molars. One of these devices is the , appliance Pendulum suggested by Hilg [...] ers. This device also requires a minimum of the patient's cooperation; considering that the lack of the patient's cooperation can compromise the careful elaborated treatment plan. The aim of work is to describe the characteristic, the way of making and the indication of the Pendulum, based on case illustrations practices medicine.

Mêrian Lucena M., Leiros; Leão Pereira, Pinto.

2004-08-01

323

Qualidade de vida de pacientes submetidos à exodontia de terceiros molares / Quality of life in patients undergoing third molar extraction  

Scientific Electronic Library Online (English)

Full Text Available INTRODUÇÃO: A remoção dos terceiros molares pode causar transtornos e prejuízos à qualidade de vida. OBJETIVO: Avaliar a qualidade de vida de pacientes submetidos à exodontia de terceiros molares, discutindo os eventos mais comumente observados. MATERIAL E MÉTODO: Sessenta pacientes de uma Clínica [...] Privada de Cirurgia, da cidade de João Pessoa-PB, foram submetidos à exodontia de terceiros molares, pelo mesmo operador e em condições semelhantes. Os dados foram coletados em duas etapas: a primeira foi realizada no dia do procedimento, quando foram anotados os dados do paciente, assim como as informações relacionadas à cirurgia. A segunda etapa foi realizada sete dias após o procedimento, quando os pacientes responderam o formulário acerca da qualidade de vida durante o pós-operatório. RESULTADO: 71,4% dos pacientes submetidos a Osteotomia e Odontossecção mantiveram suas atividades normais, e 28,6% não mantiveram. No entanto, quanto aos pacientes não submetidos às técnicas, 40,9% mantiveram suas atividades normais e 59,1% não mantiveram. De acordo com a classificação de Pell & Gregory, percebeu-se que 71,4% dos pacientes Classe 3 mantiveram suas atividades sociais normalmente, enquanto 60% dos pacientes Posição C não as mantiveram. Dos pacientes que se isolaram socialmente e foram submetidos às técnicas, 71,4% relataram a dor como o principal motivo, e 100% dos pacientes Classe 3 e 80% dos pacientes Posição C optaram pela mesma resposta. CONCLUSÃO: Os resultados indicam que as técnicas empregadas no transoperatório não interferem na qualidade de vida do paciente durante o pós-operatório e a posição tem maior influência do que a classe, no que se refere ao desenvolvimento normal das atividades sociais. Abstract in english INTRODUCTION: The removal of third molars can cause disorders and damage in quality of life. OBJECTIVE: This study aimed to evaluate the quality of life in patients underwent surgery, discussing the most commonly events observed. MATERIAL AND METHOD: Sixty patients of a private surgery clinic from [...] João Pessoa/PB were underwent extraction of third molars by the same surgeon and and under the same conditions. Data were collected in two steps: the first one was accomplished at the day of the procedure, which were noted down both patient and surgery informations. The second step were realized seven days after the procedure, the patients answered a form about life quality at the postoperative period. RESULT: 71,4% patients underwent to osteotomy and odontosection maintained their normal activities and 28,6% did not. While in patients not submitted to the techniques, 40,9% maintained their normal activities and 59,1% did not. According to Pell & Gregory classification, 71,4% of patients Class 3 maintained normally their social activities, while 60% of patients Position C didn´t. Patients who remained socially isolated and were underwent to techniques, 71,4% reported as the main reason the pain, and 100% of patients Class 3 and 80% of patients Position C have chosen the same answer. CONCLUSION: The results suggest that the techniques used in the transoperative does not influence the quality of life during the postoperative and the position has more influence than the class, in respect to the development of normal social activities.

Talita Lopes dos, Santos; Elis Janaina Lira dos, Santos; Rodrigo Barros Esteves, Lins; Lucas Formiga, Araújo; Bruno da Silva, Mesquita; Talvane, Sobreira.

2015-02-01

324

Cerebelo y tracto urinario inferior / Cerebellum and lower urinary tract  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: Spanish Abstract in spanish OBJETIVO: Revisar el papel del cerebelo en la dinámica del tracto urinario inferior. MÉTODO: Metodología anatomofuncional que incluye estudio estructural, funcional y de neurotransmisores. RESULTADOS: Se describen las complejas conexiones del cerebelo y su influencia sobre la función del tracto urin [...] ario inferior. CONCLUSIONES: Es sorprendente la interrelación funcional entre cerebelo y tracto urinario inferior, ejerciendo un papel modulador inhibitorio durante la fase de llenado y facilitador durante la fase de vaciado. Abstract in english OBJECTIVES: To review the role of cerebellum on the lower urinary tract dynamics. METHODS: Anatomic-functional methodology including structural, functional and neurotransmitters study. RESULTS: We describe the complex connections of the cerebellum and its influence on the lower urinary tract functio [...] n. CONCLUSIONS: It is surprising the functional relationship between cerebellum and lower urinary tract, playing a inhibitory modulating role during the filling phase and facilitating the voiding phase.

Jesús María, Díez Rodríguez; Jesús, Salinas Casado; Antonio, Mañas Pelillo; Miguel, Mora Durbán; Javier, Navarro Sebastián; Mariano, Arrizabalaga Moreno.

2005-06-01

325

Agenesia de veia cava inferior associada à trombose venosa profunda / Agenesis of inferior vena cava associated with deep venous thrombosis  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Languages: English, Portuguese Abstract in portuguese A agenesia da veia cava inferior é uma anomalia congênita rara, que foi recentemente identificada como um importante fator de risco para o desenvolvimento e a recorrência de trombose venosa profunda de membros inferiores em jovens. O objetivo deste trabalho foi relatar o caso de uma paciente que apr [...] esentou trombose venosa profunda dois meses após a realização de cirurgia de varizes. A angiotomografia computadorizada demonstrou a presença de anomalia venosa complexa com ausência da veia cava inferior. Abstract in english The agenesis of the inferior vena cava is a rare congenital anomaly, which was recently identified as an important risk factor for the development and recurrence of deep venous thrombosis especially in young people. The goal of this work was to report the case of a patient who presented deep venous [...] thrombosis approximately two months after varicose vein surgery. The computerized angiotomography demonstrated the presence of a complex venous anomaly with absence of the inferior vena cava.

Clovis Luis, Konopka; Marcelo, Salame; Geórgia Andrade, Padulla; Raquel Rodrigues, Muradás; Julio César, Batistella.

2010-09-01

326

Distalizador de molares superiores con pistones de níquel-titanio. Informe de un caso / Molar distalizer with nickel-titanium pistons. A case presentation  

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish Para distalizar los molares superiores en pacientes con maloclusiones clase II, se han utilizado diversos aparatos. Se ha visto que la mayoría de ellos tienden a rotar e inclinar las coronas de los primeros molares. En este trabajo se presenta un aparato fijo capaz de distalizar los molares con muy [...] poca rotación e inclinación, que no requiere el uso de fuerzas extra-orales. La aplicación de fuerzas ligeras y constantes mediante pistones de níquel-titanio optimizan los movimientos y disminuyen el tiempo de tratamiento. Otra ventaja de este dispositivo reside en que por estar cementado no se necesita cooperación por parte del paciente. Abstract in english Various devices have been used to distalize upper molars on class II malocclusion patients. It has been noted that most of those devices tend to incline and rotate first molars’ crowns, because of the force applied on them. This presentation introduces a fixed device that is able to move distally up [...] per molars with reduced rotation or distal inclination. Therefore, the use of extra-oral forces would be minimized. Constant low intensity forces applied by the nickel titanium’s open spring piston optimizes movement and decreases treatment time. Another advantage of this specific device is the fact, that it is bonded, so patient’s high degree of cooperation is no a requirement for upper molars distalization treatments.

Rafael J., Prato.

2007-12-01

327

Prediction of postoperative pain after mandibular third molar surgery  

DEFF Research Database (Denmark)

To evaluate the predictive potential of preoperative psychological and psychophysiological variables in estimating severity of postoperative pain following mandibular third molar surgery (MTMS). Methods: Following ethical committee approval and informed consent, 40 consecutive patients scheduled for MTMS were included. Preoperative psychometric indicators of anxiety, depression, and vulnerability were evaluated by patient questionnaires. Thermal thresholds and heat pain perception (1 second phasic stimuli: 44 degrees C to 48 degrees C) were evaluated with quantitative sensory testing techniques. Standardized surgery was performed during local anesthesia. Postoperative pain management was with rescue paracetamol and ibuprofen. The patients were instructed to record each day their pain at rest and during dynamic conditions, and their requirement of analgesics for 14 days following surgery.

Rudin, Asa; Eriksson, Lars

2010-01-01

328

Incidencia de comunicación bucosinusal tras la extracción de 389 terceros molares superiores / Incidence of oral sinus communications in 389 upper third molar extraction  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: Spanish Abstract in spanish Introducción. La incidencia de las comunicaciones bucosinusales (CBS) tras la extracción del tercer molar superior no se conoce con exactitud. Objetivos. El objetivo de este estudio fue identificar la incidencia de las CBS tras la extracción de 389 cordales superiores realizadas durante el año 2003 [...] en el Máster de Cirugía Bucal e Implantología Bucofacial de la Universidad de Barcelona. Material y método. Se registraron diversas variables con el fin de determinar la relación de la extracción del tercer molar con la incidencia de las CBS: la edad y el sexo del paciente, la angulación del cordal, la técnica quirúrgica y la sospecha radiológica de proximidad con el seno maxilar. Resultados. Únicamente el 5.1% (IC 95%: 2.2-7.3%) de las extracciones quirúrgicas de los cordales superiores provocaron una CBS. El riesgo de producir una CBS fue similar en todos los grupos de edad, y aumentó con la profundidad de inclusión del tercer molar, la complejidad de la técnica quirúrgica y al efectuar ostectomía. Abstract in english Introduction. The incidence of oral sinus communications (OSC) following the extraction of an upper third molar remains uncertain. Objectives. The purpose of this study was to determine the incidence of OSC following the extraction of 389 consecutive upper third molars during 2003 in the Master of O [...] ral Surgery and Orofacial Implantology (Barcelona University, Spain). Patients and method. Different variables were recorded, including patient age, sex, molar angulation, surgical technique and radiological sinus proximity, to determine the relation between third molar extraction and the incidence of OSC. Results. Only 5.1% (95% CI: 2.2-7.3%) of the upper molar surgical extractions produced OSC, the risk of which was found to be similar in all age groups and increased with the depth of third molar inclusion, the complexity of the surgical technique and the performance of an ostectomy.

Marta del, Rey Santamaría; Eduard, Valmaseda Castellón; Leonardo, Berini Aytés; Cosme, Gay Escoda.

2006-07-01

329

The inferior turbinate flap for closure of septal perforations.  

Science.gov (United States)

In 31 patients a symptomatic septal perforation was repaired using an inferior-turbinate flap originally described by Masing. In approximately 50% of the cases the perforation was closed for two-thirds or more. Postoperative scarring causing nasal obstruction or alar asymmetry occurred in 21% of the cases. Some specific symptoms such as epistaxis, whistling and frontal headache appeared to improve even after partial closure. However, the overall degree of satisfaction of the patients and the degree of closure of the perforation were related. Based on the results of this series the inferior-turbinate flap did not prove satisfactory for the closure of septal perforations. PMID:3370854

Vuyk, H D; Versluis, R J

1988-02-01

330

Infrared optical constants, molar absorption coefficients, dielectric constants, molar polarisabilities, transition moments and dipole moment derivatives of liquid N, N-dimethylformamide-carbon tetrachloride mixtures  

Science.gov (United States)

Mid-infrared spectra of the N, N-dimethylformamide-carbon tetrachloride system by transmission and single- and multiple-reflection ATR technique in the whole composition range (0 xDMF ? 1), recorded at room temperature between 5000 and 840 cm -1, are presented. The complex optical constant, molar absorption coefficient, complex dielectric constant and complex molar polarisability spectra are determined. The wavenumber × imaginary molar polarisability spectra were fitted to the classical damped oscillator model, which gives intensities, vibrational transition moments, and dipole moment derivatives with respect to normal coordinates of the vibrations.

Biliškov, Nikola

2011-07-01

331

A rare presentation of dens in dente in the mandibular third molar with extra oral sinus  

OpenAIRE

The unusual case of dense in dente in mandibular molar area with extra oral sinus in a 30-year-old female is presented. The chief complaint of the patient was wound formation and pus discharge from the right side of lower jaw for many years. Clinical examination revealed extra oral sinus and mild swelling in vestibular region opposite the right mandibular molars. On radiographical examination, right mandibular third molar had bulbous root associated with periapical radiolucency. It appeared t...

Bansal Monika; Singh N; Singh Anand

2010-01-01

332

Apparent molar volumes of sodium naproxen in water at several concentrations and temperatures  

OpenAIRE

Densities of aqueous solutions of sodium naproxen have been measured as functions of concentration (from 0.0250 to 0.5000 mol kg-1 ) and temperature (from 278.15 to 313.15 K). The apparent molar volumes, partial molar volumes at infinite dilution and partial molar expansibility were calculated. The dependence of these properties with temperature is also shown. The results are interpreted in terms of solute-solvent interactions.

Holgui?n, Andre?s R.; Delgado, Daniel R.; Ruidiaz, Miller A.; Vargas, Edgar F.; Marti?nez, Fleming

2011-01-01

333

[A modified technique for transsubmucosal maxilloethmoid sinus surgery through the inferior turbinate--transsubmucosal sinus surgery through the inferior turbinate].  

Science.gov (United States)

In 1993, in the Journal of the Oto-Rhino-Laryngological Society of Japan, the authors published an endoscopic endonasal approach to surgery for chronic sinusitis, performing a transsubmucosal maxillectomy, ethmoidectomy and sphenoidectomy through the inferior turbinate, which the authors tentatively termed "swinging of the nasolacrimal duct and inferior turbinate." With the original technique, some bony structure was left partially exposed during resection of the mucosa in some patients, who suffered from postoperative crust formation. This technique thus required improvement. To solve this problem, the authors made an antero-posterior incision along the inferior turbinate during submucosal turbinectomy. This technique has solved most of the problems and greatly reduced postoperative crust formation, thereby considerably reducing the time for postoperative wound healing as compared with that seen with the original technique. The authors report herein on this surgical technique and indication, an improvement on the original method. PMID:23678674

Tsuta, Yoshiaki; Murata, Kiyotaka

2013-03-01

334

Inferior Colliculus Lesions Impair Eyeblink Conditioning in Rats  

Science.gov (United States)

The neural plasticity necessary for acquisition and retention of eyeblink conditioning has been localized to the cerebellum. However, the sources of sensory input to the cerebellum that are necessary for establishing learning-related plasticity have not been identified completely. The inferior colliculus may be a source of sensory input to the…

Freeman, John H.; Halverson, Hunter E.; Hubbard, Erin M.

2007-01-01

335

Transhepatic approach for extracardiac inferior cavopulmonary connection stent fenestration.  

LENUS (Irish Health Repository)

We report on a 3-year-old male who underwent transcatheter stent fenestration of the inferior portion of an extracardiac total cavopulmonary connection in the setting of hypoplastic left heart syndrome. Transhepatic approach, following an unsuccessful attempt from the femoral vein facilitated delivery of a diabolo-shaped stent.

Kenny, Damien

2012-02-01

336

Pelvic Fascias and Inferior Hypogastric Plexus. Surgical and Anatomical Considerations.  

Directory of Open Access Journals (Sweden)

Full Text Available Iatrogenic lesions of the hypogastric Plexus are frequent, due to the fact that autonomic nerves are located on the lowest portion of the sacral vertebrae, and they are very difficult to locate and dissect during surgery. Three fresh cadavers were studied, 5 formolized. A fascia that is extended from one ureter to the other was found, which surrounds the genital vessels and the Superior Hypogastric Plexus. When it passes the sacral promontory it constitutes a frontal partition between the fascia recti and the sacrum, leaving the ureters laterally and the sympathetic plexus medially. It continues as to sagital partitions which leave outside the Inferior Hypogastric Plexus. The hypograstric plexus is conformed by the Hypogastric nerves, the Sacral Splanchnic nerves and the Pelvic Splanchnic nerves. It constitutes two parasagital partitions, which are divided into two groups of fibers: some posterior, which are distributed through the superior rectum, and some anterior, to the bladder, inferior rectum, prostate (or cervix, and erectile tissue. The previously mentioned approach the prostate from behind through its lateral inferior side, on 8:20 time, and enter the penis cell through the medium perineal aponeurosis, behind the membranous urethra. In spite of the difficulties of the identification of the Inferior Hypogastric Plexus during the surgical act, we believe that if dissection is made by maintaining integrity of these fascias, noble structures are respected even if they can’t be seen.

Nahuel Paesano

2010-12-01

337

Inferior olivary hypertrophy is uncommon in progressive supranuclear palsy.  

Science.gov (United States)

Inferior olivary hypertrophy (IOH) is an uncommon disorder attributed to transsynaptic degeneration and characterized clinically by palatal myoclonus and histopathologically by swollen, fenestrated neurons and bizarre astrocytic gliosis. IOH is usually associated with the interruption of the dentato-olivary tract, most often from cerebrovascular lesions in the dentate nucleus or red nucleus. In progressive supranuclear palsy (PSP), the dentato-olivary tract is consistently affected, and there are reports suggesting that IOH may be relatively common in PSP. To address this issue, the frequency of IOH was investigated in 264 PSP brains. To determine if there was a relationship between IOH and neurofibrillary degeneration in the dentato-olivary pathway, the severity of neurofibrillary degeneration was assessed in the inferior olivary nucleus, cerebellar dentate nucleus and red nucleus in PSP cases with and without IOH. IOH was uncommon in PSP, being found in only 4 of 264 (1.5%) brains, which was not significantly different from the frequency in non-PSP controls (8 of 862; 0.9%). In all non-PSP cases IOH was associated with cerebrovascular lesions, but not in any of the PSP cases with IOH. The severity of neurofibrillary degeneration in the inferior olivary nucleus was significantly greater in PSP cases with IOH than in PSP cases without IOH, whereas there were no significant differences in the cerebellar dentate nucleus and red nucleus. These findings suggest that direct neurofibrillary degeneration in the inferior olivary nucleus may be related to IOH in PSP rather than transsynaptic degeneration. PMID:15235807

Katsuse, Omi; Dickson, Dennis W

2004-08-01

338

Intrahepatic venous collaterals in obstruction of the inferior vena cava  

International Nuclear Information System (INIS)

The case of a 46-year-old female patient with an intrahepatic venous shunt and a congenital occlusion of the inferior vena cava in the hepatic segment is taken as an example to explain the diagnostic efficiency of the diagnostic methods of sonography, CT, magnetic resonance imaging, and angiography. (orig./MG)

339

Inferior Turbinate osteoma — rare cause of nasal obstruction  

OpenAIRE

Osteomas are common benign tumors of the paranasal sinus, with a predilection for the frontal sinus. We report a rare case of inferior turbinate osteoma in a 54 year old lady. The osteoma was resected completely by endoscopic sinus surgery and the patient was relieved of symptoms.

Kumar, K. Krishna; Sumathi, V.; Sundhari, V.

2010-01-01

340

Prismatic adaptation changes visuospatial representation in the inferior parietal lobule.  

Science.gov (United States)

Prismatic adaptation has been shown to induce a realignment of visuoproprioceptive representations and to involve parietocerebellar networks. We have investigated in humans how far other types of functions known to involve the parietal cortex are influenced by a brief exposure to prismatic adaptation. Normal subjects underwent an fMRI evaluation before and after a brief session of prismatic adaptation using rightward deviating prisms for one group or after an equivalent session using plain glasses for the other group. Activation patterns to three tasks were analyzed: (1) visual detection; (2) visuospatial short-term memory; and (3) verbal short-term memory. The prismatic adaptation-related changes were found bilaterally in the inferior parietal lobule when prisms, but not plain glasses, were used. This effect was driven by selective changes during the visual detection task: an increase in neural activity was induced on the left and a decrease on the right parietal side after prismatic adaptation. Comparison of activation patterns after prismatic adaptation on the visual detection task demonstrated a significant increase of the ipsilateral field representation in the left inferior parietal lobule and a significant decrease in the right inferior parietal lobule. In conclusion, a brief exposure to prismatic adaptation modulates differently left and right parietal activation during visual detection but not during short-term memory. Furthermore, the visuospatial representation within the inferior parietal lobule changes, with a decrease of the ipsilateral hemifield representation on the right and increase on the left side, suggesting thus a left hemispheric dominance. PMID:25164675

Crottaz-Herbette, Sonia; Fornari, Eleonora; Clarke, Stephanie

2014-08-27

341

Asymptomatic Lumbar Vertebral Erosion from Inferior Vena Cava Filter Perforation  

International Nuclear Information System (INIS)

In 2002, a 24-year-old female trauma patient underwent prophylactic inferior vena cava filter placement. Recurrent bouts of renal stones prompted serial CT imaging in 2004. In this brief report, we describe erosion and ossification of the L3 vertebral body by a Greenfield filter strut

342

Duodenal perforation caused by an inferior vena cava filter.  

Science.gov (United States)

The inferior vena cava (IVC) filter is known as an effective and safe method for preventing fatal pulmonary thromboembolism in patients with deep vein thrombosis. Usually, the remaining IVC filters are asymptomatic and do not cause clinical problems. We report a case of duodenal perforation caused by a remaining IVC filter. PMID:22363914

Bae, Mi Ju; Chung, Sung Woon; Lee, Chung Won; Kim, Sangpil; Song, Seunghwan

2012-02-01

343

Duodenal Perforation Caused by an Inferior Vena Cava Filter  

OpenAIRE

The inferior vena cava (IVC) filter is known as an effective and safe method for preventing fatal pulmonary thromboembolism in patients with deep vein thrombosis. Usually, the remaining IVC filters are asymptomatic and do not cause clinical problems. We report a case of duodenal perforation caused by a remaining IVC filter.

Bae, Mi Ju; Chung, Sung Woon; Lee, Chung Won; Kim, Sangpil; Song, Seunghwan

2012-01-01

344

Drenagem anômala de veia pulmonar inferior direita em veia cava inferior associada a apêndice hepático intracardíaco Anomalous drainage of the right inferior pulmonary vein into the inferior vena cava associated to intrathoracic hepatic appendix  

Directory of Open Access Journals (Sweden)

Full Text Available Descreve-se o caso de uma paciente de 61 anos de idade, com drenagem anômala de veia pulmonar inferior direita em veia cava inferior, associada a apêndice hepático intratorácico, herniado através de fenda no diafragma. A correção cirúrgica foi realizada por anastomose direta da veia anômala com o átrio esquerdo, pela redução do apêndice hepático para a cavidade abdominal e, finalmente, pelo fechamento do defeito diafragmático. O pós-operatório decorreu sem qualquer complicação. Os autores chamam a atenção para a raridade do caso.The authors present a case of a 61-year-old woman with anomalous drainage of the right inferior pulmonary vein into the inferior vena cava associated to an intrathoracic hepatic appendix herniated through a diaphragmatic defect. Surgical correction was obtained by direct anastomosis of the anomalous vein to the left atrium, reduction of the hepatic appendix to the abdominal cavity and closure of the diphragmatic defect. The postoperative course was unevenftul. The rarity of this condition is stressed.

Carlos R Moraes

1988-08-01

345

Injuries of the retrohepatic inferior vena cava and the liver  

Directory of Open Access Journals (Sweden)

Full Text Available Beckground. Injuries of the retrohepatic inferior vena cava, and the liver have mortality rate up to 71-78%. We presented a patient with combined injury of the retrohepatic inferior vena cava, liver, craniocerebral and thoracic traumas, inflicted in a traffic accident. Case report. Man, 20 years old has been injured in a traffic accident. At admission, 20 minutes after the injury, the patient was comatose and hypotensive. Bloody content was obtained by abdominal tracer. The patient underwent emergent laparotomy, utilizing trifurcated incision and cell saver device. Abdominal exploration revealed two liters of free blood and massive retroperitoneal hematoma. Manual compression of the liver was done, as well as perihepatic packing, complete hepatic vascular exclusion and mobilization of the right liver lobe. Due to impressive chemodynamic instability supraceliac aortic clamping was performed. Upon exposure of the retrohepatic inferior vena cava and right liver lobe, multiple lacerations of retrohepatic inferior vena cava and right hepatic vein, and right hepatic vein avulsion were found. We also identified an injury of VII and VIII segments of the liver (grade V according to the Moore's classification. Nonexpansive hepatoduodenal ligament hematoma and the injury of II and III segments of the liver group II/III according to Moore were found. Venorrhaphy of the inferior vena cava was done in the area of circumference of the right hepatic vein, a portion of which served as autologous vein patch. Continuous prolene 3/0 venorrhaphy of the distal caval laceration was done. Total caval and aorta clamping time of the inferior vena cava was 41 minutes. Atypical resection, debridment, of hepatic segments was done by using a harmonic scalpel. Hepatoduodenal ligament was declamped after 65 minutes. Fibrin glue was applied on the resectioned area of liver. The patient received 3.2 l of autologuos blood transfusion with 5 units of packed red blood cells, 6 units of fresh frozen plasma, 13 units of concentrated thrombocytes and 15 units of cryoprecipitates. Due to coagulopathy, factor rVIIa was administered. Bilateral toracal drainage was done. Small bilateral contusions of the frontal part of the brain were noticed but the patient successfully recovered and was dismissed after three weeks. Conclusion. Combined injuries of the inferior vena cava and the liver befall into the most complex vascular traumas, thus representing a challenge for any complete medical team to manage them. The patient presented in our study was urgently transported to the hospital, immediately operated on applying modern doctrines of anesthesiology, transfusiology and vascular surgery that, all together, resulted into favorable treatment outcome with no distant complications.

Koprivica Radenko

2008-01-01

346

First molar cross-bite is more closely associated with a reverse chewing cycle than anterior or pre-molar cross-bite during mastication.  

Science.gov (United States)

A posterior cross-bite is defined as an abnormal bucco-lingual relationship between opposing molars, pre-molars or both in centric occlusion. Although it has been reported that patients with unilateral posterior cross-bite often show unique chewing patterns, the relationship between the form of cross-bite and masticatory jaw movement remains unclear in adult patients. The objective of this study was to investigate masticatory jaw movement among different forms of cross-bite. One hundred and one adults were recruited in this study: 27 had unilateral first molar cross-bite (MC group); 28, unilateral pre-molar cross-bite (PC group); 23, anterior cross-bite (AC group); and 23, normal occlusion (control group). Masticatory jaw movement of the lower incisor point was recorded with six degrees of freedom jaw-tracking system during unilateral mastication. Our results showed that the reverse chewing ratio during deliberate unilateral mastication was significantly larger in the MC group than in the PA (P < 0.001), AC (P < 0.001) and control (P < 0.001) groups. These findings suggest that compared to the anterior or pre-molar cross-bite, the first molar cross-bite is more closely associated with a higher prevalence of a reverse chewing cycle. PMID:25158937

Tomonari, H; Ikemori, T; Kubota, T; Uehara, S; Miyawaki, S

2014-12-01

347

Scimitar vein descending from the right inferior lobe to the inferior vena cava beneath the diaphragm: a rare case.  

Science.gov (United States)

Scimitar syndrome is a rare anomaly involving a pulmonary vein flowing into the inferior vena cava (scimitar vein) and is commonly associated with lung hypoplasia wherein a scimitar vein drains the entire lung. We report a rare case of a scimitar vein draining only the right inferior lobe found in a 77-year-old male cadaver. In this case, no hypoplastic lung or abnormal lobulation were observed. The scimitar vein drained the inferior lobe of the right lung after piercing the diaphragm and draining into the inferior vena cava. The remaining two right pulmonary veins, draining the superior and middle lobes, terminated into the left atrium. To the best of our knowledge, this is the first report of a scimitar vein during gross anatomical dissection in an adult cadaver. In adults, scimitar veins are often benign, incidental findings, and little is known about them. The present case of a scimitar vein partially draining the lung without lung hypoplasia offers important insights into the formative processes of the pulmonary venous system. PMID:24633625

Hayashi, Shogo; Hirai, Shuichi; Naito, Munekazu; Kawata, Shinichi; Qu, Ning; Hatayama, Naoyuki; Terayama, Hayato; Moriyama, Hiroshi; Itoh, Masahiro

2015-03-01

348

Estudo clínico e ultraestrutural pós-turbinectomia inferior parcial / Clinical and ultrastructural study after partial inferior turbinectomy  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Languages: English, Portuguese Abstract in portuguese O presente trabalho refere-se ao estudo dos resultados clínicos e histológicos obtidos após a turbinectomia inferior parcial (TIP), cirurgia indicada no tratamento da obstrução nasal crônica causada pela hipertrofia das conchas nasais inferiores. MATERIAL E MÉTODOS: Foram estudados vinte pacientes, [...] divididos em dois grupos de dez cada (grupos A e B), submetidos à TIP, associada à septoplastia ou não. Os pacientes foram reavaliados clinicamente e histologicamente (com biópsia das áreas regeneradas das conchas inferiores), em dois períodos pós-operatórios diferentes: um grupo após oito a doze meses (grupo A) e outro após dois anos de TIP (grupo B). RESULTADOS: Os resultados clínicos mostraram-se satisfatórios para o alívio da obstrução nasal no grupo A, e insatisfatórios no grupo B. Entretanto, melhores resultados histológicos, com maior recuperação e diferenciação epitelial da mucosa regenerada das conchas inferiores após a TIP foram observados no grupo B, com sua ultraestrutura ciliar normal. CONCLUSÕES: A cirurgia revelou ser eficaz a curto, mas não em médio prazo, apesar da recuperação histológica ter sido importante. Abstract in english We report clinical and histological results obtained after partial inferior turbinectomy (PIT), surgery indicated for the treatment of chronic nasal obstruction. METHODS: Twenty patients were divided into two groups submitted to PIT plus septoplasty and PIT alone. The patients were reassessed clinic [...] ally and histologically by means of a biopsy of the regenerated areas in the inferior turbinates at two different times after PIT, i.e., after 8 to 12 months (group A) and after two years (group B). RESULTS: The clinical results proved to be satisfactory for the relief of nasal obstruction in group A and unsatisfactory in group B. However, better histological results with better recovery and epithelial differentiation of the regenerated mucosa of the inferior turbinates after PIT were observed in group B. CONCLUSION: Surgery proved to be effective on a short-term but not on a long-term basis, and histological recovery did not accompany improvement of clinical signs and symptoms.

Rogério Dutra, Bandos; Valder Rodrigues de, Mello; Maria Dolores Seabra, Ferreira; Maria, Rossato; Wilma Terezinha, Anselmo-Lima.

2006-10-01

349

Sublingual Traumatic Ulcerative Lesions Caused by the Eruption of First Primary Mandibular Molars: a Case Report / Lesión Ulcerativa Traumática Sublingual Causada por la Erupción del Primer Molar Temporal: Reporte de un Caso  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish La ulceración traumática de la superficie ventral de la lengua es una condición poco común en bebés y niños pequeños, la cual se asocia a menudo con los dientes natales y neonatales en los recién nacidos. El objetivo de este reporte es presentar un caso de úlceras bilaterales en la superficie ventra [...] l de la lengua causada por la erupción de los primeros molares mandibulares temporales en un infante de sexo masculino de 14 meses de edad. En niño fue capaz de señalar las lesiones y se negó a consumir ciertas bebidas y alimentos, lo que favoreció un diagnóstico precoz. El tratamiento clínico consistió en el suavizado manual de los bordes afilados de los primeros molares inferiores y un régimen casero de solución de clorhidrato de lidocaína (Xilocaína®, Astra) junto a la solución esteroidal de acetónido de triamcinolona (Omcilon - A, Brystol-Myers) para el alivio de los síntomas y curación de la lesión respectivamente. La curación completa de ambas lesiones y la alimentación normal se observó en una semana del control de seguimiento. La detección temprana de las lesiones y el cumplimiento de los padres con los regímenes caseros recomendados, son factores claves para un resultado exitoso del tratamiento, ya que los casos no tratados de estas lesiones ulcerosas pueden provocar dificultades en la alimentación y una evolución inadecuada. Aunque existen varios informes de lesiones ulcerosas en la lengua causada por la erupción dental, que se asocian generalmente con la erupción de los incisivos mandibulares temporales (enfermedad de Riga-Fede). Sin embargo, no existen informes de lesiones ulcerosas causadas por otros dientes temporales. Abstract in english Traumatic ulceration of the ventral surface of the tongue is an uncommon condition in infants and toddlers, which is often associated with natal and neonatal teeth in newborns. The aim of this report is to present a case of bilateral ulcerative ulcers on the ventral surface of the tongue caused by t [...] he eruption of first primary mandibular molars in a 14-month-old male child. The child was able to point to the lesions and also refused to consume certain beverages and foods, which favored an early diagnosis. Clinical treatment consisted of manual smoothing of the sharp edges of both mandibular first molars and a home regimen of lidocaine hydrochloride solution (Xylocaine®, Astra) and a steroid solution of triamcinolone acetonide (Omcilon ­ A, Brystol-Myers) for symptoms relief and lesion healing, respectively. Complete healing of both lesions and normal feeding were both observed at a one-week follow-up exam. Early detection of the lesions and parental compliance with recommended home regimens were key factors for a successful treatment outcome, since untreated cases of tongue ulcerative lesions may evoke feeding difficulties and failure to thrive. Although there are several reports of ulcerative lesions on the tongue caused by dental eruption, they are usually associated with the eruption of mandibular primary incisors (Riga-Fede disease). However, there are no reports of ulcerative lesions caused by other primary teeth.

Cassia Cilene, Dezan; Luiz Reynaldo de Figueiredo, Walter; Karin, Weber-Gasparoni; João Paulo Menck, Sangiorgio; Bruna, Nogari; Karen Barros Parron, Fernandes.

1136-11-01

350

Sublingual Traumatic Ulcerative Lesions Caused by the Eruption of First Primary Mandibular Molars: a Case Report Lesión Ulcerativa Traumática Sublingual Causada por la Erupción del Primer Molar Temporal: Reporte de un Caso  

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Full Text Available Traumatic ulceration of the ventral surface of the tongue is an uncommon condition in infants and toddlers, which is often associated with natal and neonatal teeth in newborns. The aim of this report is to present a case of bilateral ulcerative ulcers on the ventral surface of the tongue caused by the eruption of first primary mandibular molars in a 14-month-old male child. The child was able to point to the lesions and also refused to consume certain beverages and foods, which favored an early diagnosis. Clinical treatment consisted of manual smoothing of the sharp edges of both mandibular first molars and a home regimen of lidocaine hydrochloride solution (Xylocaine®, Astra and a steroid solution of triamcinolone acetonide (Omcilon ­ A, Brystol-Myers for symptoms relief and lesion healing, respectively. Complete healing of both lesions and normal feeding were both observed at a one-week follow-up exam. Early detection of the lesions and parental compliance with recommended home regimens were key factors for a successful treatment outcome, since untreated cases of tongue ulcerative lesions may evoke feeding difficulties and failure to thrive. Although there are several reports of ulcerative lesions on the tongue caused by dental eruption, they are usually associated with the eruption of mandibular primary incisors (Riga-Fede disease. However, there are no reports of ulcerative lesions caused by other primary teeth.La ulceración traumática de la superficie ventral de la lengua es una condición poco común en bebés y niños pequeños, la cual se asocia a menudo con los dientes natales y neonatales en los recién nacidos. El objetivo de este reporte es presentar un caso de úlceras bilaterales en la superficie ventral de la lengua causada por la erupción de los primeros molares mandibulares temporales en un infante de sexo masculino de 14 meses de edad. En niño fue capaz de señalar las lesiones y se negó a consumir ciertas bebidas y alimentos, lo que favoreció un diagnóstico precoz. El tratamiento clínico consistió en el suavizado manual de los bordes afilados de los primeros molares inferiores y un régimen casero de solución de clorhidrato de lidocaína (Xilocaína®, Astra junto a la solución esteroidal de acetónido de triamcinolona (Omcilon - A, Brystol-Myers para el alivio de los síntomas y curación de la lesión respectivamente. La curación completa de ambas lesiones y la alimentación normal se observó en una semana del control de seguimiento. La detección temprana de las lesiones y el cumplimiento de los padres con los regímenes caseros recomendados, son factores claves para un resultado exitoso del tratamiento, ya que los casos no tratados de estas lesiones ulcerosas pueden provocar dificultades en la alimentación y una evolución inadecuada. Aunque existen varios informes de lesiones ulcerosas en la lengua causada por la erupción dental, que se asocian generalmente con la erupción de los incisivos mandibulares temporales (enfermedad de Riga-Fede. Sin embargo, no existen informes de lesiones ulcerosas causadas por otros dientes temporales.

Cassia Cilene Dezan

2011-12-01

351

Computed tomographic anatomy of the mandibular first and second molars and their surrounding structures in the spread of odontogenic infection  

International Nuclear Information System (INIS)

The purposes of this study were to analyze the CT anatomy of the mandibular first and second molars in uninfected subjects and to clarify the pathway of odontogenic infection originating from the mandibular first and second molars. CT anatomies, especially for bucco-lingual aspects and the surrounding soft tissues, were investigated in 100 uninfected subjects and 17 infected patients. At the level of bifurcation, disappearance of the cortical plates was frequently observed on the buccal and lingual sides of the first molars, and it was reduced on the buccal side in the second molar. In the first molar, the bony width was thinner on the buccal than the lingual side. The lingual cortices were thinner in the second molar. All medial pterygoid and 88% of masseter muscles were situated posteriorly, without horizontally overlapping the second molar, whereas the mylohyoid muscle (MhM) overlapped horizontally with the first and second molars. The MhM was positioned superior to the root apices in 10 and 39% of first and second molars, respectively. All patients with first molar infection showed involvement of buccal structures, and one showed lingual side involvement. In contrast, six of nine patients with second molar infection showed involvement on the lingual side. Infection originating from the second molar was more likely to spread to the lingual side than infection originating from the first molar. CT anatomy surrounding the causal teeth supported the spread pathways of al teeth supported the spread pathways of mandibular first and second molar infection. (author)

352

Phase-separation-induced fractionation in molar mass in aqueous mixtures of gelatin and dextran.  

Science.gov (United States)

An overview of the effects of phase separation of aqueous mixtures of gelatin and dextran on the fractionation in molar mass of these two components is given. Molar mass distributions in coexisting phases were investigated using size exclusion chromatography with multiangle laser light scattering. The initial molar mass of the native material, concentration, and temperature were varied. The results show a strong fractionation in molar mass for both components. The molar mass of the native material and concentration appeared to be the only factors that affected the final molar mass distributions, temperature having no effect. The results show that in the molar mass range where fractionation is the strongest, i.e., roughly below the maximum in the distribution, fractionation is governed by a Boltzmann factor e(-deltaG/kT), where deltaG denotes the free energy involved in transferring a polymer with a certain length from the enriched to the depleted phase, and in this case turns out to be proportional to the molar mass. Comparison of the results of phase separation with results on dialysis shows that water affinity is not the driving force for the phase separation of gelatin and dextran in aqueous solution. The gelation properties of gelatin in both phases were also determined. The gelation properties of gelatin in the coexisting phases differ from those of native gelatin. In particular, the gelatin in the gelatin-poor phase shows strong differences compared to the native material. PMID:12636676

Edelman, M W; Tromp, R H; van der Linden, E

2003-02-01

353

Comparison of pulpotomy with formocresol and MTA in primary molars: a systematic review and meta- analysis  

OpenAIRE

Introduction: There are various studies looking at the effects of formocresol (FC) and mineral trioxide aggregate (MTA) on pulpotomy of primary molars. This is a systematic review of literature comparing the success rates of MTA and FC in pulpotomy of primary molars.

Fallahinejad Ghajari, Masoud; Mirkarimi, Mahkameh; Vatanpour, Mehdi; Kharrazi Fard, Mohammad Javad

2008-01-01

354

Simultaneous distalization of maxillary first and second molars by means of superelastic NiTi coils.  

Directory of Open Access Journals (Sweden)

Full Text Available Several methods have been suggested in order to distalize maxillary molars in patients with Class II malocclusion. A simple iritraoral fixed appliance for quick simultaneous distalization of both first and second maxillary molars is presented in this article. The appliance is easy to fabricate, costs less than other similar prefabricated appliances, and it can be used bilaterally or unilaterally.

M.A. Papadopoulos

1998-01-01

355

Origin of choriocarcinoma in previous molar pregnancy proved by DNA analysis  

International Nuclear Information System (INIS)

A 17-year old woman had in a short time period (seven months) a very exciting reproduction history. Molar pregnancy in December 1993, choriocarcinoma in January 1994 and induced abortion in June 1994. DNA analysis proved the origin of the choriocarcinoma in the previous molar pregnancy. (author)

356

Factors affecting root curvature of mandibular first molar  

International Nuclear Information System (INIS)

To find the cause of root curvature by use of panoramic and lateral cephalometric radiograph. Twenty six 1st graders whose mandibular 1st molars just emerged into the mouth were selected. Panoramic and lateral cephalometric radiograph were taken at grade 1 and 6, longitudinally. In cephalometric radio graph, mandibular plane angle, ramus-occlusal place angle, gonial angle, and gonion-gnathion distance(Go-Gn distance) were measured. In panoramic radiograph, elongated root length and root angle were measured by means of digital subtraction radiography. Occlusal plane-tooth axis angle was measured, too. Pearson correlations were used to evaluate the relationships between root curvature and elongated length and longitudinal variations of all variables. Multiple regression equation using related variables was computed. The pearson correlation coefficient between curved angle and longitudinal variations of occlusal plane-tooth axis angle and ramus-occlusal plane angle was 0.350 and 0.401, respectively (p1+0.745X2(Y: root angle, X1: variation of occlusal plane-tooth axis angle, X2: variation of ramus-occlusal plane angle). It was suspected that the reasons of root curvature were change of tooth axis caused by contact with 2nd deciduous tooth and amount of mesiath 2nd deciduous tooth and amount of mesial and superior movement related to change of occlusal plane

357

Removal of an upper third molar from the maxillary sinus.  

Science.gov (United States)

The maxillary sinus or antrum is the largest of the paranasal sinuses. It is located in the maxillary bone and has a proximity to the apexes of upper molars and premolars, which allows it to form a direct link between the sinus and the oral cavity. Dislocation of a foreign body or tooth to the interior of a paranasal sinus is a situation that can occur as a result of car accidents, firearm attacks, or iatrogenic in surgical procedures. Therefore, it is necessary to know how to treat this kind of situation. This study's objective is to report the case of a 23-year-old female patient, leucoderma, who sought treatment from the Surgical Unit at the Dental Faculty of the Federal University of Sergipe. She had a history of pain and edema in the right side of the genian region and two failed attempts at removing dental unit (DU) 18. The extraoral clinical exam revealed intense edema of the left hemiface with signs of infection, excoriation of the labial commissure, hematoma, a body temperature of 39°C, and a limited ability to open her mouth. The patient was medicated and treated surgically. The tooth was removed from the maxillary sinus with caution, as should have been done initially. PMID:25705524

Amorim, Klinger de Souza; da Silva, Vanessa Tavares; da Cunha, Rafael Soares; Souto, Maria Luisa Silveira; São Mateus, Carla Rocha; Souza, Liane Maciel de Almeida

2015-01-01

358

Removal of an Upper Third Molar from the Maxillary Sinus  

Science.gov (United States)

The maxillary sinus or antrum is the largest of the paranasal sinuses. It is located in the maxillary bone and has a proximity to the apexes of upper molars and premolars, which allows it to form a direct link between the sinus and the oral cavity. Dislocation of a foreign body or tooth to the interior of a paranasal sinus is a situation that can occur as a result of car accidents, firearm attacks, or iatrogenic in surgical procedures. Therefore, it is necessary to know how to treat this kind of situation. This study's objective is to report the case of a 23-year-old female patient, leucoderma, who sought treatment from the Surgical Unit at the Dental Faculty of the Federal University of Sergipe. She had a history of pain and edema in the right side of the genian region and two failed attempts at removing dental unit (DU) 18. The extraoral clinical exam revealed intense edema of the left hemiface with signs of infection, excoriation of the labial commissure, hematoma, a body temperature of 39°C, and a limited ability to open her mouth. The patient was medicated and treated surgically. The tooth was removed from the maxillary sinus with caution, as should have been done initially. PMID:25705524

Amorim, Klinger de Souza; da Silva, Vanessa Tavares; da Cunha, Rafael Soares; Souto, Maria Luisa Silveira; São Mateus, Carla Rocha; Souza, Liane Maciel de Almeida

2015-01-01

359

Molar crown inner structural organization in Javanese Homo erectus.  

Science.gov (United States)

This contribution investigates the inner organizational pattern (tooth tissue proportions and enamel-dentine junction morphology) of seven Homo erectus permanent molar crowns from the late Lower-early Middle Pleistocene Kabuh Formation of the Sangiran Dome (Central Java, Indonesia). The previous study of their external characteristics confirmed the degree of time-related structural reduction occurred in Javanese H. erectus, and also revealed a combination of nonmetric features which are rare in the Lower and early Middle Pleistocene dental record, but more frequently found in recent humans. In accordance with their outer occlusal morphology, the specimens exhibit a set of derived internal features, such as thick to hyperthick enamel, an incomplete expression of the crest patterns at the enamel-dentine junction (EDJ) level, a sharp EDJ topography. As a whole, these features differ from those expressed in some penecontemporaneous specimens/samples representing African H. erectus/ergaster and H. heidelbergensis, as well as in Neanderthals, but occur in recent human populations. Further research in virtual dental paleoanthropology to be developed at macroregional scale would clarify the polarity and intensity of the intermittent exchanges between continental and insular Southeast Asia around the Lower to Middle Pleistocene boundary, as well as should shed light on the still poorly understood longitudinal evolutionary dynamics across continental Asia. PMID:25209431

Zanolli, Clément

2015-01-01

360

Experience versus complication rate in third molar surgery  

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Full Text Available Abstract Objectives The records of 1087 patients who underwent surgical removal of third molar teeth were prospectively examined to analyse the possible relationship between postoperative complications and the surgeon's experience parameter. Method and materials Seven surgeons (three specialists in surgical dentistry [specialists SD] and four oral and maxillofacial Senior House Officers [OMFS residents] carried out the surgical procedures. For each patient, several variables were recorded including age, gender, radiographic position of extracted teeth, treating surgeon, duration of surgery and postoperative complications. Results Analysis of the data revealed some differences in the incidence of complications produced by the specialists SD and OMFS residents. The main statistically relevant differences were increase the incidences of trismus, nerve paraesthesia, alveolar osteitis and infection in the resident-treated group, while the specialist-treated group showed higher rates of post-operative bleeding. Conclusion The higher rate of postoperative complications in the resident-treated group suggests that at least some of the complications might be related to surgical experience. Further work needs to compare specialists of training programmes with different years of experience, using large cross – sectional studies.

Al-Khawalde Mohammed

2006-05-01

361

Endodontic Treatment of a Maxillary Second Molar with Developmental Anomaly: A Case Report  

Science.gov (United States)

Fusion is a rare occurrence in molar teeth. The purpose of this rare case presentation is to describe the nonsurgical endodontic treatment of maxillary molar. A 28-year-old patient was referred for endodontic treatment of her chronic apical abscess of right maxillary second molar. In the clinical examination, a sinus tract adjacent to involved tooth and a small crown of supernumerary tooth fused to the buccal surface of the molar at gingival margin was observed. Endodontic treatment was decided for the involved molar for functional reason. Recall examination, a year after completion of endodontic and restorative treatments, showed the tooth was clinically asymptomatic and there was no radiographic lucency around the apical region. PMID:24327819

Asgary, Saeed

2007-01-01

362

Appropriate electrode placement site for electric pulp testing first molar teeth.  

Science.gov (United States)

Twenty volunteers with first molars free of restorations and caries were recruited. One molar from each arch was selected, and rubber dam was applied. Seven sites on each crown were electric pulp tested 4 times with an Elements Diagnostic Unit, and lowest threshold responses were recorded. Data were analyzed with one-way analysis of variance and the Tukey test at the .01 level. The lowest response for both the maxillary and mandibular teeth was with the probe on the mesiobuccal cusp tip. Other sites showed an increase in level from the mesiobuccal cuspal surface, mesiobuccal gingival surface, and the center of the supporting cusps (palatal of maxillary molar, buccal of mandibular molar). No significant difference in responses was found between male and female subjects; however, male subjects responded at higher thresholds than female subjects on all test sites except the mesiobuccal cusp tip. The optimum site for pulp testing first molars is the mesiobuccal cusp tip. PMID:17963950

Lin, Jack; Chandler, Nicholas; Purton, David; Monteith, Brian

2007-11-01

363

PEMANFAATAN BIJI KAKAO INFERIOR CAMPURAN SEBAGAI SUMBER ANTIOKSIDAN DAN ANTIBAKTERI  

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Full Text Available [ENGLISH] There are about 30% of cocoa beans still classified as inferior or low quality beans due to diseases. Low-quality cocoa beans can be used as the source of polyphenolic substances. The purpose of this study was to determine the potency of inferior cocoa beans with various particle sizes as raw materials for polyphenol extraction, and the use of polyphenol-rich cocoa extracts as antioxidant and antibacterial substances. The research was conducted in two stages, namely preliminary research and primary research. This preliminary study aimed to obtain polyphenol-rich cocoa bean extract and to examine antioxidant activity using DPPH method. The next research was to conduct antibacterial test against Escherichia coli and Bacillus subtilis using well diffusion method treated using polyphenols of each type of various particle size (16 mesh, 25 mesh, 35 mesh with concentrations of 0 ppm, 25.000 ppm, 50.000 ppm, 75.000 ppm, 100.000 ppm. The plates were incubated at 37°C for 24 hours and the inhibition power against bacteria was observed. The results showed that the greater the concentration of polyphenol extracts and the smaller size of the filter powder cocoa resulted in the increase of bacterial growth inhibition area. Keywords: Polyphenol; Cocoa beans; Escherichia coli; Bacillus subtilis [INDONESIAN] Biji kakao inferior merupakan biji buah kakao bermutu rendah karena terserang penyakit dan belum termanfaatkan secara maksimal. Biji kakao berkualitas rendah dapat dimanfaatkan dengan cara mengekstrak kandungan polifenolnya. Tujuan penelitian ini adalah mengetahui potensi ekstrak polifenol biji kakao inferior dengan variasi ukuran partikel sebagai bahan yang memiliki aktivitas antioksidan dan penghambat pertumbuhan bakteri. Penelitian ini dilakukan dalam dua tahap, yaitu penelitian pendahuluan dan penelitian utama. Penelitian pendahuluan bertujuan untuk memperoleh esktrak polifenol dari biji kakao inferior campuran yang terserang penyakit. Esktrak polifenol hasil penelitian pendahuluan berpotensi sebagai senyawa antioksidan dan antibakteri. Pengujian aktivitas antioksidan dilakukan dengan menggunakan metode DPPH. Sedangkan pengujian antibakteri menggunakan metode difusi sumuran. Daya penghambatannya terhadap bakteri Escherichia coli dan Bacillus subtilis menggunakan esktrak polifenol dari variasi ukuran partikel (16 mesh, 25 mesh, 35 mesh yaitu sebanyak 0 ppm, 25000 ppm, 50000 ppm, 75000 ppm, 100000 ppm dan dilakukan secara triplo. Setelah itu diinkubasi selama 24 jam pada suhu 37°C dan diamati daya penghambatan terhadap bakteri. Hasil penelitian menunjukkan bahwa semakin besar konsentrasi ekstrak polifenol dan semakin kecil ukuran saringan bubuk biji kakao, menghasilkan luasan diameter daerah hambatan pertumbuhan bakteri yang semakin besar. Kata kunci: Polifenol; Kakao; Escherichia coli; Bacillus subtilis How to citate: Kusuma YTC, S Suwasono, S Yuwanti. 2013. Pemanfaatan biji kakao inferior campuran sebagai sumber antioksidan dan antibakteri. Berkala Ilmiah Pertanian 1(2: 33-37.

Yulianto Tri Chandra Kusuma

2013-11-01

364

Inferior venacaval compression due to excessive abdominal packing / Comprensión de la vena cava inferior debido al exceso de taponamiento abdominal / Compressão da veia cava inferior por causa do excesso de tamponamento abdominal  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Languages: English, Portuguese, Spanish Abstract in portuguese Compressão da veia cava inferior é um problema comum no fim da gravidez. Também pode ocorrer por causa da compressão da veia cava inferior por tumores abdominais ou pélvicos. Relatamos um caso de compressão iatrogênica aguda da veia cava inferior por causa do excesso de tamponamento durante uma ciru [...] rgia intra-abdominal. Abstract in spanish La compresión de la vena cava inferior es un problema común al final del embarazo. También puede ocurrir debido a la compresión de la vena cava inferior por tumores abdominales o pélvicos. Relatamos un caso de compresión iatrogénica aguda de la vena cava inferior debido al exceso de taponamiento dur [...] ante una cirugía intraabdominal. Abstract in english Inferior venacaval compression is a common problem in late pregnancy. It can also occur due to compression of inferior venacava by abdominal or pelvic tumors. We report a case of acute iatrogenic inferior venacaval compression due to excessive abdominal packing during an intraabdominal surgery. [...

M.C.B., Santhosh; Rohini Bhat, Pai; Roopa, Sachidanand; Varun, Byrappa; Raghavendra P., Rao.

2014-06-01

365

Morphology of the Physiological Apical Foramen in Maxillary and Mandibular First Molars / Morfología del Foramen Fisiológico Apical en Primeros Molares Maxilares y Mandibulares  

Scientific Electronic Library Online (English)

Full Text Available La información relacionada a la anatomía del foramen fisiológico apical es limitada. Conocer su diámetro y forma contribuye al trabajo clínico, específicamente en los procedimientos de limpieza y conformación del tercio apical. El objetivo de este estudio ex vivo fue determinar los diámetros menor, [...] mayor y la forma del foramen fisiológico apical en las raíces de primeros molares maxilares y mandibulares. Se realizó un estudio descriptivo sobre 89 primeros molares recientemente extraídos. Se seccionaron las raíces a 3­5 mm del ápice y fueron preparadas para su análisis bajo magnifi