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The sealing of second mandibular temporary molar pits and fissure with the laser of Nd: YAG, phosphoric acid and the glass ionomer cement; Selamento de fossulas e fissura de segundo molar deciduo inferior com laser de Nd: YAG, acido fosforico e cimento de ionomero de vidro  

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The main of our study was to check the sealing of second mandibular temporary molar pits and fissure, in vitro, with the laser of Nd: YAG, phosphoric acid at 37% and the glass ionomer cement (CIV, Fuji IX GC).The proposal was to check the structural morphologic changes in the laser irradiation upon the enamel surface to watch the pits and fissure sealing with the glass ionomer cement use after the laser irradiation and to verify the efficiency of the 'double conditioning' (phosphoric acid + Nd: YAG). At the same time we watch the evolution of the temperature in the pulp chamber's inside. Our desire was to achieve a therapeutic alternative technic to prevent the dental caries. The Nd: YAG laser parameters were the same: 79 mJ of energy per pulse; frequency of 5 Hz; mean power of 0,4 W; optical fiber on contact of 320 {mu}m diameter; fluency of 99,52 J/ cm{sup 2}, assuming that the only differential was the time of the laser application on the enamel surface. The samples were prepared with this way: Laser Nd: YAG (53 second) + acid + CIV (Fuji IX); Laser Nd: YAG (53 s); Laser Nd: YAG (20 s + 20 s) + acid + CIV; Laser Nd: YAG (20 s + 20 s); Acid + CIV; Control. Through the scanning electron microscopy (MEV) we noticed fusion and resolidification regions due to the laser irradiation and a better adaptation of the glass ionomer cement when we did the 'double conditioning'. Concerning the temperature increase we can conclude that the echeloned period was the best recommended because the temperature was found in a pattern that would not cause any damage to the dental pulp. For future studies we suggest a longer relaxing time between the laser irradiation, a comparative study of this method with other lasers, the use of other sealing materials and the study with the permanent teeth. (author)

Toda, Maria Aparecida

2003-07-01

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Lower Third Molar Region / Región del Tercer Molar Inferior  

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Full Text Available SciELO Chile | Language: English Abstract in spanish 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  

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Full Text Available SciELO Brazil | Language: English 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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Inferior Alveolar Nerve Injury after Mandibular Third Molar Extraction: a Literature Review  

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Full Text Available Objectives: The purpose of this study was to systematically review the comprehensive overview of literature data about injury to the inferior alveolar nerve after lower third molar extraction to discover the prevalence of injury, the risk factors, recovery rates, and alternative methods of treatment. Material and Methods: Literature was selected through a search of PubMed electronic databases. Articles from January 2009 to June 2014 were searched. English language articles with a minimum of 6 months patient follow-up and injury analysis by patient’s reporting, radiographic, and neurosensory testing were selected. Results: In total, 84 literature sources were reviewed, and 14 of the most relevant articles that are suitable to the criteria were selected. Articles were analyzed on men and women. The influence of lower third molar extraction (especially impacted on the inferior alveolar nerve was clearly seen. Conclusions: The incidence of injury to the inferior alveolar nerve after lower third molar extraction was about 0.35 - 8.4%. The injury of the inferior alveolar nerve can be predicted by various radiological signs. There are few risk factors that may increase the risk of injury to the nerve such as patients over the age of 24 years old, with horizontal impactions, and extraction by trainee surgeons. Recovery is preferable and permanent injury is very rare.

Rafael Sarikov

2014-12-01

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Projection of the oblique line in periapical radiographs of mandibular molars / Projeção da linha oblíqua na região de molares inferiores em radiografias periapicais  

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Full Text Available SciELO Brazil | Language: English Abstract in portuguese OBJETIVO: Identificar e quantificar a frequência da projeção da linha oblíqua sobre as cristas alveolares dos molares inferiores em radiografias periapicais. METODOLOGIA: Foram selecionadas 500 radiografias periapicais da região de molares inferiores e avaliada a presença ou a ausência da linha oblí [...] qua. Quando presente, foi analisada a interferência desta estrutura sobre a imagem das cristas alveolares dos molares inferiores. Os dados obtidos, considerando a frequência da sobreposição da linha oblíqua sobre as cristas alveolares dos molares inferiores foram expressos em percentagens. RESULTADOS: Nas 500 radiografias periapicais avaliadas, a linha oblíqua foi observada em 363 radiografias (72,6%). Nestas, em 308 (84,8%), houve sobreposição da linha oblíqua sobre as cristas alveolares. Entretanto, em 55 radiografias (15,1%) não foi encontrada interferência. Nas radiografias em que houve a sobreposição da linha oblíqua sobre as cristas alveolares (308), a incidência de sobreposição em apenas um local foi de 64,6% (199 radiografias); em dois locais foi de 33,4% (103 radiografias) e em três locais foi de 1,9% (6 radiografias). CONCLUSÃO: A sobreposição da linha oblíqua sobre a imagem das cristas alveolares na região de molares inferiores representou uma fração significativa do total da amostra. Abstract in english PURPOSE: To identify and quantify the frequency of the projection of the oblique line over the alveolar crests of the mandibular molars in periapical radiographs. METHODS: Five hundred periapical radiographs of the mandibular molar region were selected and evaluated for the presence or absence of th [...] e oblique line. When present, its interference on the image of the alveolar crest of the mandibular molars was analyzed. The data obtained was expressed as a percentage of the overlap of the oblique line to the alveolar crests of the mandibular molars. RESULTS: The oblique line was observed in 363 out of the 500 periapical radiographs (72.6%). Out of the 363, 308 (84.8%) showed an overlap of the oblique line over the alveolar crests. However, 55 radiographs (15.1%) did not show such interference. Of the radiographs showing an overlap (308), the incidence of an overlap was 64.6% at a single site (199 radiographs), 33.4% at two sites (103 radiographs), and 1.9% (6 radiographs) at three sites. CONCLUSION: The overlap of the oblique line over the image of the alveolar crests in the mandibular molar region was observed in a significant portion of the total sample.

Ruchielli Loureiro, Borghetti; Vanessa Paim, Nora; Luis César da, Costa Filho; Aline Rose Cantarelli, Morosolli; Maria Ivete Bolzan, Rockenbach.

2010-12-01

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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  

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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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Danger zone in mandibular molars before instrumentation: an in vitro study / Zona de risco em molares inferiores previamente a instrumentação: estudo "in vitro"  

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Full Text Available SciELO Brazil | Language: English Abstract in portuguese O objetivo deste estudo foi medir as zonas de risco de raízes mesiais de molares inferiores, demonstrando porque perfurações radiculares podem ocorrer durante o preparo do sistema de canais radiculares. Cem raízes mesiais de molares inferiores foram seccionadas horizontalmente 2mm abaixo da bifurcaç [...] ão e as concavidades distais foram medidas com o auxílio de um microscópio, desde a borda dos canais até a superfície externa da raiz. A espessura média para as zonas de risco das raízes mesiais foi 0,789 +/- 0,182 mm. Não houve diferença estatística significante entre as medidas das zonas de risco nos canais mésio-vestibulares e mésio-linguais de molares inferiores. Abstract in english The aim of this work was to measure the danger zone in mandibular molars, relating to strip perforations that might affect the mesial root during canal instrumentation. One hundred mesial roots were sectioned 2mm below the furcation and the distal concavities were measured with a microscope from the [...] border of the canals to the outer dentin of the root. The average thickness of the danger zone of the mesial roots was 0.789 +/- 0.182mm. No significant statistical differences were observed comparing the danger zone of mesiobuccal and mesiolingual canals.

Paulo Ferreira, Garcia Filho; Ariadne, Letra; Renato, Menezes; Antônio Márcio Rezende do, Carmo.

2003-12-01

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Efecto del tratamiento quirúrgico de los terceros molares inferiores sobre el síndrome de disfunción temporomandibular  

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Full Text Available Se realizó una investigación con la finalidad de determinar el efecto del tratamiento quirúrgico de los terceros molares inferiores no erupcionados sobre el síndrome de disfunción temporomandibular en 44 estudiantes, a quienes les efectuaron estudios clinicoestomatognáticos durante los períodos preoperatorio y posoperatorio. El índice de disfunción de Helkimo arrojó disfunción ligera en el 55 % y moderada en el resto durante la fase preoperatoria, mientras que el examen posoperatorio reveló disfunción ligera en el 45 % y moderada o severa en el 55 %. Se comprobaron notables cambios en el rango del movimiento mandibular durante la apertura bucal máxima y en los movimientos de lateralidad de la mandíbula.An investigation was conducted with the aim of determining the effect of surgical treatment of unerupted lower third molars on the temporomandibular joint dysfunction syndrome in 44 students who underwent clinical and stomatognathic studies during the preoperative and postoperative period. The index of Helkimo's dysfunction yielded a mild dysfunction in 55 % of cases, and a moderate dysfunction in the remaining patients during the preoperative phase, while the postoperative examination revealed a mild dysfunction in 45 % of patients and a moderate to severe dysfunction in 55 % of cases. Remarkable changes were proved regarding the rank of mandibular movement during maximum oral opening and in lateral movements of the jaw.

José Manuel Díaz Fernández

1996-08-01

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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  

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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  

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Full Text Available SciELO Spain | Language: Spanish Abstract in spanish 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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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  

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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 anestesia 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.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

2009-10-01

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Bilateral fusion of mandibular second molars with supernumerary teeth: case report / Fusão bilateral dos segundos molares inferiores com dente supranumerário: relato de caso  

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Full Text Available SciELO Brazil | Language: English Abstract in portuguese A fusão é uma anomalia de desenvolvimento dental caracterizada pela união de dois dentes adjacentes. Devido a baixa freqüência desta alteração e as suas características morfológicas complexa o tratamento, quando indicado, torna-se muitas vezes difícil. Neste artigo iremos relatar um caso raro de fus [...] ão bilateral entre os segundos molares inferiores com dentes supranumerários. Abstract in english Fusion is a developmental anomaly characterized by the union of two adjacent teeth. In this article we report a rare case of bilateral fusion of permanent mandibular second molars with supernumerary teeth. The rarity with which this entity appears, along with its complex characteristics, often make [...] it difficult to treat. The endodontic management of one tooth is described, as well as the successful treatment of a periradicular lesion.

Eduardo, Nunes; Ivaldo Gomes de, Moraes; Paulo Márcio de Oliveira, Novaes; Simone Maria Galvão de, Sousa.

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Elimination of permanent injuries to the inferior alveolar nerve following surgical intervention of the "high risk" third molar.  

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We aimed to find out whether improved preoperative assessment and surgical planning with cone beam computed tomography (CT) could reduce damage to the inferior alveolar nerve when high risk impacted mandibular third molars are extracted. We recorded the presence or absence of postoperative neuropathy after extraction of 200 lower third molars in 185 patients (where cone beam CT had shown contact between the nerve and root) after treatment in the oral surgery department of King's College Hospital. All patients had had cone beam CT of the teeth after panoramic radiography had indicated increased risk of injury to the nerve during extraction. Experienced oral surgeons did all the operations and postoperative reviews. Patients reported temporary alteration of sensation after operation in 12% of teeth but it resolved in all cases and no patient reported permanent loss of sensation. Permanent sensory disturbance in the distribution of the inferior alveolar nerve after third molars have been removed can be eliminated in high risk cases if operations are planned carefully (including cone beam CT), and the procedure is done by a skilled surgeon who has an appreciation of the anatomy of the nerve and roots, and an insight into the mechanical effect of their surgical manipulation. The incidence of permanent neurosensory dysfunction in this study was zero even though all teeth were intimately related to the inferior alveolar canal. PMID:23010201

Umar, G; Obisesan, O; Bryant, C; Rood, J P

2013-06-01

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Influencia del hábito tabáquico en el postoperatorio de la cirugía del tercer molar inferior / Influence of smoking upon the postoperative course of lower third molar surgery  

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Full Text Available SciELO Spain | Language: Spanish Abstract in spanish Objetivos: Determinar si tras la cirugía del tercer molar inferior el tabaco influye en el postoperatorio (dolor y trismo) y valorar clínicamente el estado de la herida, analizando las posibles diferencias entre fumadores y no fumadores. Diseño del estudio: Los pacientes que participaron en el estud [...] io fueron distribuidos de forma aleatoria en dos grupos: Fumadores y no fumadores. Se les realizó la extracción quirúrgica de los terceros molares inferiores en la Unidad de Cirugía Bucal y Maxilofacial de la Universidad Complutense de Madrid. Las variables registradas fueron el trismo a los 7 días, la intensidad del dolor y la necesidad de medicación de rescate durante un periodo de una semana. Se analizó también el estado de la herida (coloración, presencia de placa, etc.) Resultados: Hubo dos casos de infección postoperatoria en el grupo de pacientes fumadores. El trismo postoperatorio fue mayor en los fumadores (p=0.05) Conclusiones: No hubo diferencias estadísticamente significativas en cuanto a dolor, pero sí se observó un mayor trismo en el grupo de fumadores. El tabaco no influyó en el estado de la herida ( color, inflamación de los bordes, confrontación de los mismos, ulceración, etc.). Abstract in english Objectives: To determine whether smoking influences the postoperative course (pain and trismus) of lower third molar surgery, with a clinicalevaluation of surgical wound condition and analysis of the possible differences between smokers and nonsmokers. Design: The study subjects were randomly distri [...] buted into two groups(smokers and nonsmokers) and subjected to lower third molar extraction in the Unit of Oral and Maxillofacial Surgery (Madrid Complutense University, Spain).The study variables were trismus after 7 days, the intensity of pain and theneed for rescue medication during a period of one week. The surgical wound wasalso assessed (color, presence of plaque, etc.). Results: Two cases of postoperative infection were documented among thesmokers, and postoperative trismus was found to be greater among the latter (p=0.05). Conclusions: There were no statistically significant differences between the two groups in terms of pain, though trismus was greater among the smokers. Smoking did not influence wound condition (color, marginal inflammation, appositioning of the margins, ulceration, etc.).

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

2006-02-01

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Clinical efficacy of computed tomography and coronectomy for prevention of postoperative inferior alveolar nerve injury occurring after impacted mandibular third molar surgery  

International Nuclear Information System (INIS)

Our aim was to evaluate the clinical efficacy of computed tomography and coronectomy for preventing postoperative inferior alveolar nerve injury after impacted mandibular third molar surgery. Among the patients who visited Kawasaki Medical School Hospital between January 2009 and December 2010, 12 patients with high-risk signs of inferior alveolar nerve injury on panoramic imaging were examined for the extraction of impacted mandibular third molar by computed tomography (CT). CT examinations were performed in order to examine the relationship between the root apex of impacted mandibular third molar and inferior alveolar canal for 16 teeth. Based on the imaging findings, the patients were informed about treatment methods and their consent was obtained. We compared the CT and panoramic findings and discussed the relationship between the impacted third molar and the inferior alveolar nerve. Medical records were also examined for the presence of abnormal postoperative complications. Interruption of the cortical white line of the inferior alveolar canal was identified in 13 panoramic radiographs, and bending of the inferior alveolar canal was observed in 2 panoramic radiographs. CT findings indicated type 2 inferior alveolar nerve proximity in 13 teeth, and there was no proximity in 3 teeth. The observation was selected in 10 teeth showing nerve proximity in CT findings. Traditional third molar removal was performed for the 3 teeth with no nerve proximity. Coronectomy was with no nerve proximity. Coronectomy was performed in 3 teeth with nerve proximity. The clinical course was uneventful. To prevent inferior alveolar nerve injury, coronectomy may be a better means of removing the crown of an impacted third molar while leaving the roots intact, in cases where teeth might be in proximity with the inferior alveolar nerve. (author)

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Evaluation of accessory furcation canals of permanent mandibular molars using radiography and clearing / Avaliação do canal cavo-interradicular em molares inferiores permanentes através de Rx e diafanização  

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Full Text Available SciELO Brazil | Language: English Abstract in portuguese OBJETIVO: Avaliar a presença do canal cavo-interradicular em molares inferiores permanentes através de radiografias e diafanização. METODOLOGIA: A amostra foi constituída por 344 molares inferiores re-hidratados, preparados e armazenados individualmente em recipientes de vidro. A presença do canal c [...] avo-interradicular foi investigada por um único operador treinado usando lupa (4x) para as radiografias e microscópio óptico odontológico (30x) para as amostras diafanizadas. Microscopia eletrônica de varredura (MEV) foi usada para verificar diferenças morfológicas do assoalho pulpar. RESULTADOS: A análise radiográfica mostrou que 9% das amostras tinham uma zona levemente radiolúcida, 2% mostravam uma imagem sugestiva, e 89% das amostras não tinham nenhuma evidência. Pela diafanização, o canal não foi encontrado nas amostras avaliadas. Pela MEV, as amostras recém extraídas mostraram com canalículos dentinários uniformes; as demais apresentaram pequenos sítios com canalículos uniformes. CONCLUSÃO: O exame radiográfico não foi o melhor método de diagnóstico; a diafanização é um excelente método avaliativo, pois permite a visualização tridimensional da anatomia interna dental em pesquisas in vitro. Abstract in english PURPOSE: To evaluate the presence of furcation canals of permanent mandibular teeth using radiography and a clearing technique. METHODS: The sample comprised 344 extracted mandibular molars. The presence of furcation canals was assessed by a single trained observer using magnifying lens (4x) for the [...] dental radiographs and a dental optical microscope (30x) for the cleared specimens. Scanning electron microscopy (SEM) was used to evaluate morphological differences in the pulp chamber floor. RESULTS: Radiographs showed that 9% of the specimens had radiolucent areas, 2% had an image that suggested a canal, and 89% had no abnormal findings. Clearing techniques did not show any accessory canal. SEM images revealed dentin tubules in recently extracted teeth; the other specimens had small areas with dentin tubules. CONCLUSION: Radiography was not better than the clearing technique to diagnose furcation canals. The clearing technique can provide three-dimensional visualization of the internal tooth anatomy for in vitro studies.

Leandro José Corrêa, Harb; Fernanda Lavarda, Ramos; Carine Weber, Pires; Maria Gabriela Pereira de, Carvalho; Katia Olmedo, Braun.

2010-12-01

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Avaliação da efetividade do laser de baixa potência na redução da dor pós-operatória em cirurgia de terceiros molares inferiores inclusos  

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Objetivo: avaliar a efetividade do laser de baixa intensidade (LLLT) no controle da dor pós-operatória em cirurgia de terceiros molares inferiores inclusos, comparando-o com o lado oposto, que não foi exposto ao LLLT, no mesmo indivíduo. Metodologia: participaram do estudo 16 indivíduos, que apresentaram os dentes 38 e 48 inclusos, em posição similar, e que realizaram a remoção dos dentes no mesmo tempo cirúrgico. O laser foi aplicado imediatamente após a remoção do 48 (lado dire...

Juliane Wathier; Cintia Mussi Milani Contar; Luciana Reis Azevedo Alanis; Sérgio Aparecido Ignácio; Maria Ângela Naval Machado

2011-01-01

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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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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 p...

Tarley Eloy Pessoa de Barros; Gabriel Denser Campolongo; Reginaldo Perilo Oliveira; Nilton Alves; Reinaldo José de Oliveira

2011-01-01

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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  

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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 SciELO Cuba | Language: Spanish Abstract in spanish 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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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 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

2013-03-01

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Eficacia analgésica de diclofenaco versus metilprednisolona en el control del dolor postoperatorio tras la cirugía del tercer molar inferior / Analgesic efficacy of diclofenac versus methylprednisolone in the control of postoperative pain after surgical removal of lower third molars  

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Full Text Available SciELO Spain | Language: Spanish Abstract in spanish Objetivo: Comparar la eficacia analgésica 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 los 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. La valoración del dolor se hizo mediante escala visual analógica y semicuantitativa y número de analgésicos de rescate consumidos. El control del dolor se hizo en la primera hora, a las 8 horas, 24 horas, 48 y 72 horas. Se usó el programa estadístico BMDP para hacer un amplio tratamiento de los datos. Resultados: En el dolor reflejado por los pacientes en la escala visual analógica no hubo diferencias de conjunto entre los dos grupos (aunque sí las hubo en ciertos momentos). Tampoco hubo diferencias en el número de analgésicos de rescate consumidos. Conclusiones. La reducción del dolor que se consigue con el corticoide no es significativa por lo que no está justificado su uso rutinario. Abstract in english Objetive: To compare the analgesic efficacy of methylprednisolone (corticoid) versus diclofenac (nonsteroidal antiinflammatory-NSAID-) after surgical removal of lower third molars. Study Design: Prospective study on 73 patients for the surgical removal of their lower third molars. These patients wer [...] e separated in two groups at random: a diclofenac group and a methylprednisolone group. A record card was filled in with preoperative and postoperative epidemiological and clinic data. The pain level assessment was made on a semiquantitative and an analogical visual scales and in relation to the amount of rescue analgesics consumed. Pain levels were measured at 1, 8, 24, 48 and 72 hours. In order to make a broad study of data, BMDP program was used for statistics. Results: In the pain described by patients in the analogical visual scale there were no differences between groups as a whole. There were no differences in the amount of rescue analgesics consumed. Conclusions. There is less pain in the corticoid group but not as to justify its routine use.

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

2005-12-01

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Biometric study of the width, length and depth of the root trunk groove of human lower second molars / Estudo biométrico da largura, comprimento e profundidade da pre-furca dos segundos molares inferiores de humanos  

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Full Text Available SciELO Brazil | Language: English Abstract in portuguese Foram obtidos 100 dentes, segundos molares inferiores (51 esquerdos e 49 direitos) extraídos de humanos quando diagnosticados como condenados (extração indicada). Por meio de um aparelho Contracer foram traçados, em papel milimetrado, os perfis das faces vestibulares e linguais dos 100 dentes em est [...] udo. Estes perfis foram registrados a partir do limite amelocementário, de milímetro em milímetro, até que atingíssemos a entrada da furca. Foram realizadas medidas da largura, comprimento e profundidade da região da pré-furca, assim como o comprimento do tronco radicular. Após a análise estatística (p Abstract in english One hundred human lower second molars, 51 from the left side and 49 from the right side, extracted due to their poor clinical and radiographic conditions were utilized in this study. Using a Contracer apparatus, the profiles of the buccal and lingual root surfaces of these teeth were traced on a mil [...] limeter-scaled paper. The profiles were registered from the cementoenamel junction (CEJ), millimeter by millimeter, up to the entrance of the furcation. The width, length and depth of the root trunk groove, as well as the length of the root trunk, were studied. After statistical analysis (p

Constanza Marin de los, RIOS; Francisco Emílio, PUSTIGLIONI; Giuseppe Alexandre, ROMITO.

2002-03-01

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Eficacia analgésica del diclofenaco sódico vs. ibuprofeno después de la extracción quirúrgica de un tercer molar inferior incluido / Analgesic efficacy of diclofenac sodium versus ibuprofen following surgical extraction of impacted lower third molars  

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Full Text Available SciELO Spain | Language: Spanish Abstract in spanish -Objetivo: En este estudio evaluamos la eficacia analgésica del diclofenaco sódico en comparación con el ibuprofeno, después de la extracción quirúrgica de un tercer molar inferior incluido. -Diseño de estudio: Los pacientes que participaron en el estudio fueron distribuidos de forma aleatoria en do [...] s grupos. Uno fue el grupo ibuprofeno y el otro el grupo diclofenaco. La intervención practicada fue la extracción quirúrgica de un tercer molar inferior cuya dificultad fue determinada en función del grado de inclusión en todos los pacientes. Las variables registradas fueron la intensidad del dolor y la necesidad de medicación de rescate durante un periodo de una semana. Los registros se realizaron una vez al día a la misma hora y registrados en un cuaderno por parte del paciente. -Resultados: Un total de 81 pacientes (87.1%) fueron incluidos en el estudio. Los valores fueron similares en las primeras 48 horas postoperatorias, pero a partir del tercer día existió una tendencia del grupo diclofenaco a mostrar valores de dolor superiores, aunque sin llegar a existir diferencias estadísticamente significativas (p>0.05). Esta tendencia a presentar mayor dolor durante el periodo postoperatorio en el grupo diclofenaco también se vio reflejada en el requerimiento del analgésico de rescate y en el número de comprimidos empleados. -Conclusiones: No se evidenciaron diferencias estadísticamente significativas en cuanto a la eficacia analgésica del diclofenaco sódico respecto al ibuprofeno, aunque sí pudo observarse una mayor tendencia hacia la necesidad de más medicación suplementaria durante los 2 primeros días del postoperatorio en el grupo diclofenaco pero sin adquirir significación estadística (p>0.05). Abstract in english -Objective: An evaluation is made of the analgesic efficacy of diclofenac sodium versus ibuprofen after impacted lower third molar surgery. -Study design: The patients were randomly assigned to one of two groups (ibuprofen or diclofenac). The difficulty of third molar surgery, performed under local [...] anesthesia, was assessed by the degree of inclusion involved. The recorded study variables were pain intensity and the need for rescue medication during one week. The recordings were made once a day at the same time, using a patient-completed questionnaire. -Results: Eighty-one patients were finally included in the study (87.1%). The results were similar in the first 48 postoperative hours in both groups, though on the third day the diclofenac group tended to show higher pain scores - the differences being nonsignificant, however (p>0.05). This tendency was also reflected by an increased need for rescue medication and the consumption of a larger number of tablets in the diclofenac group. -Conclusions: There were no statistically significant differences in analgesic efficacy between diclofenac sodium and ibuprofen, though the former was associated with an increased need for supplementary medication in the first two postoperative days (p>0.05).

Vicenç, Esteller Martínez; Jordi, Paredes García; Eduard, Valmaseda Castellón; Leonardo, Berini Aytés; Cosme, Gay-Escoda.

2004-12-01

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Biometric study of the width, length and depth of the root trunk groove of human lower second molars Estudo biométrico da largura, comprimento e profundidade da pre-furca dos segundos molares inferiores de humanos  

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Full Text Available One hundred human lower second molars, 51 from the left side and 49 from the right side, extracted due to their poor clinical and radiographic conditions were utilized in this study. Using a Contracer apparatus, the profiles of the buccal and lingual root surfaces of these teeth were traced on a millimeter-scaled paper. The profiles were registered from the cementoenamel junction (CEJ, millimeter by millimeter, up to the entrance of the furcation. The width, length and depth of the root trunk groove, as well as the length of the root trunk, were studied. After statistical analysis (p Foram obtidos 100 dentes, segundos molares inferiores (51 esquerdos e 49 direitos extraídos de humanos quando diagnosticados como condenados (extração indicada. Por meio de um aparelho Contracer foram traçados, em papel milimetrado, os perfis das faces vestibulares e linguais dos 100 dentes em estudo. Estes perfis foram registrados a partir do limite amelocementário, de milímetro em milímetro, até que atingíssemos a entrada da furca. Foram realizadas medidas da largura, comprimento e profundidade da região da pré-furca, assim como o comprimento do tronco radicular. Após a análise estatística (p < 0,05, conclui-se que: a a largura da pré-furca, na face vestibular, é de 3,6 mm e na face lingual 3,3 mm; b a profundidade da pré-furca foi de 0,88 mm na face vestibular e 0,77 mm na face lingual; c o comprimento da pré-furca na face vestibular foi de 2,93 mm e de 3,61 mm na face lingual. O comprimento do tronco radicular foi de 3,09 mm na face vestibular e de 3,91 mm na face lingual (p < 0,025. Houve uma coincidência do comprimento do tronco radicular e da pré-furca em 90,2% da amostra para a face vestibular no lado esquerdo e 77,5% no lado direito; para a face lingual, a coincidência ocorreu em 77,5 % dos casos no lado esquerdo e 88,3% no lado direito.

Constanza Marin de los RIOS

2002-03-01

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Morfología de los dientes deciduos de algunos tremactinos (Ursida: Tremarctinae)  

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Se describe y compara la morfología de algunos dientes deciduos de Arctotherium tarijense Ameghino and A. angustidens Gervais and Ameghino (Ursidae, Tremarctinae) por primera vez. La morfología del dP4 y dp4 es muy similar a la del M1 y m1. La morfología general de los dP/dp4 en A. tarijense y Ursinae es similar, aunque la morfología de sus dientes definitivos es muy diferente. Los dP/dp4 de A. tarijense parecen poseer un conjunto de caracteres generalizados (en relación con el contorno ...

Carlini, Alfredo Armando; Soibelzon, Leopoldo He?ctor

2004-01-01

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Avaliação da efetividade do laser de baixa potência na redução da dor pós-operatória em cirurgia de terceiros molares inferiores inclusos  

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Full Text Available Objetivo: avaliar a efetividade do laser de baixa intensidade (LLLT no controle da dor pós-operatória em cirurgia de terceiros molares inferiores inclusos, comparando-o com o lado oposto, que não foi exposto ao LLLT, no mesmo indivíduo. Metodologia: participaram do estudo 16 indivíduos, que apresentaram os dentes 38 e 48 inclusos, em posição similar, e que realizaram a remoção dos dentes no mesmo tempo cirúrgico. O laser foi aplicado imediatamente após a remoção do 48 (lado direito - LD, intra-alvéolo, de forma pontual e sobre a região da sutura, em varredura. O mesmo procedimento foi realizado no 38 (lado esquerdo - LE, com o aparelho desligado garantindo o desconhecimento do paciente sobre qual lado recebeu o laser. Todos foram medicados e orientados quanto aos cuidados pós-operatórios e receberam as escalas visuais análogas (VAS que variavam de 0-10 cm, anotando a ausência ou presença da dor durante 5 dias do lado direito e esquerdo. Os dados foram tabulados e submetidos ao teste de Wilcoxon (p < 0,05 comparando-se as médias da VAS de 1 a 5 dias. Resultados: no 3° dia LD e LE, houve diferença estatística significante (p = 0,0284 e do LD a dor foi menor. No 1° e 5° dia houve redução da dor em ambos os lados (LD:p=0,007; LE:p=0,001. Conclusão: dentro dos limites do presente estudo o laser de baixa intensidade mostrou efetividade no controle da dor pós-operatória.

Juliane Wathier

2011-01-01

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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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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  

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Full Text Available 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 of six different pieces of straight lines joining at seven specific points and the angle of curvature at these points was determined using the slope formula. All curves analyzed in this study had varying degrees of curvatures at different points on the curve. Maximum curvature (0.40° was recorded at the middle third of the root canal. Within the limitation of the study, significant curvature occurs through out the curve existing in the mesiobuccal canal of mandibular first molar and the middle third of the curve showing greater degree of curvature. There is a possibility of greater curvature occurring in the coronal third of the curve. Though three dimensional studies would be more appropriate, Piecewise straight line approximation may be a better method than existing methods to simulate canal geometry.El objetivo de este estudio fue investigar radiográficamente la curva existente en el canal radicular mesiobucal ligeramente curvado del primer molar inferior mediante la aplicación de aproximaciones a segmentos de línea recta. Se utilizaron molares inferiores humanos extraídos que fueron radiografiados. Fueron seleccionadas, según el método de Schneider, 100 radiografías cuyo canal mesiobucal mostró una ligera curvatura (10-20°. Las curvas fueron delineadas y analizadas mediante el método de aproximación a segmentos de línea recta. Cada curva se consideró como una unidad que consta de seis diferentes segmentos de línea recta que unen a siete puntos específicos y el ángulo de curvatura en estos puntos se determinó utilizando la fórmula de la pendiente. Todas las curvas analizadas en este estudio tenían diversos grados de curvaturas en diferentes puntos de la curva. La curvatura máxima (0,40° se registró en el tercio medio del canal radicular. Dentro de la limitación del estudio, una curvatura significativa se produce a través de la curva existente en el canal mesiobucal del primer molar inferior y el tercio medio de la curva que muestra un mayor grado de curvatura. Existe la posibilidad que ocurra una mayor curvatura en el tercio coronal de la curva. Aunque un estudio tridimensional sería más apropiado, la aproximación a segmentos de línea recta puede ser un mejor método que los existentes para simular la geometría del canal.

J Prabhakar

2013-03-01

33

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  

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Full Text Available SciELO Chile | Language: English Abstract in spanish El objetivo de este estudio fue investigar radiográficamente la curva existente en el canal radicular mesiobucal ligeramente curvado del primer molar inferior mediante la aplicación de aproximaciones a segmentos de línea recta. Se utilizaron molares inferiores humanos extraídos que fueron radiografi [...] ados. Fueron seleccionadas, según el método de Schneider, 100 radiografías cuyo canal mesiobucal mostró una ligera curvatura (10-20°). Las curvas fueron delineadas y analizadas mediante el método de aproximación a segmentos de línea recta. Cada curva se consideró como una unidad que consta de seis diferentes segmentos de línea recta que unen a siete puntos específicos y el ángulo de curvatura en estos puntos se determinó utilizando la fórmula de la pendiente. Todas las curvas analizadas en este estudio tenían diversos grados de curvaturas en diferentes puntos de la curva. La curvatura máxima (0,40°) se registró en el tercio medio del canal radicular. Dentro de la limitación del estudio, una curvatura significativa se produce a través de la curva existente en el canal mesiobucal del primer molar inferior y el tercio medio de la curva que muestra un mayor grado de curvatura. Existe la posibilidad que ocurra una mayor curvatura en el tercio coronal de la curva. Aunque un estudio tridimensional sería más apropiado, la aproximación a segmentos de línea recta puede ser un mejor método que los existentes para simular la geometría del canal. Abstract in english 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 mesiobucc [...] al 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 of six different pieces of straight lines joining at seven specific points and the angle of curvature at these points was determined using the slope formula. All curves analyzed in this study had varying degrees of curvatures at different points on the curve. Maximum curvature (0.40°) was recorded at the middle third of the root canal. Within the limitation of the study, significant curvature occurs through out the curve existing in the mesiobuccal canal of mandibular first molar and the middle third of the curve showing greater degree of curvature. There is a possibility of greater curvature occurring in the coronal third of the curve. Though three dimensional studies would be more appropriate, Piecewise straight line approximation may be a better method than existing methods to simulate canal geometry.

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

2013-03-01

34

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

35

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

36

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  

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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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Ensayo clínico randomizado a doble ciego de evaluación de la efectividad del gel bioadhesivo de clorhexidina al 0.2% en la prevención de alveolitis seca tras la exodoncia de terceros molares inferiores  

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La alveolitis seca es una complicación frecuente tras la exodoncia de los terceros molares. Uno de los agentes más estudiados en su prevención es la clorhexidina. El objetivo de este estudio fue evaluar la eficacia del gel bioadhesivo de clorhexidina al 0,2% colocado intra-alveolar en la prevención de la alveolitis seca después de la extracción de los terceros molares mandibulares y analizar el impacto de los factores de riesgo como el tabaquismo y los anticonceptivos ora...

Rubio Palau, Josep

2014-01-01

38

Fusión de un tercer molar mandibular con un cuarto molar supernumerario Fusion of mandibular third molar with supernumerary fourth molar  

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Full Text Available La fusión dental es la unión de dos gérmenes dentales normalmente separados, mientras que la geminación se define como el intento de división de un único germen dental. La fusión y geminación de molares es poco frecuente en la dentición permanente. Describimos un caso clínico de un tercer molar inferior derecho fusionado a un cuarto molar supernumerario en un paciente varón de 36 años que ha presentado repetidos episodios de pericoronaritis. Tras el estudio radiológico se realiza la exodoncia del cordal semiincluido bajo anestesia local. Llevamos a cabo una revisión bibliográfica al respecto.Dental fusion is the union of two tooth buds that normally are separated, while gemination is defined as an attempt by a single tooth bud to divide. The fusion and gemination of molars is uncommon in permanent teeth. We report a clinical case of a right lower third molar fused to a supernumerary fourth molar in a 36-year-old male patient with repeated episodes of inflammation. After the radiologic study, the semi-impacted third molar was extracted under local anesthesia. The literature was reviewed.

C. López Carriches

2008-10-01

39

Influence of treatment including second molars on final and postretention molar angulation  

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Full Text Available SciELO Brazil | Language: English Abstract in portuguese OBJETIVO: analisar a influência da inclusão dos segundos molares inferiores durante a mecânica ortodôntica nas angulações dos molares ao final do tratamento e na fase de pós-contenção. MÉTODOS: a amostra consistiu em 150 radiografias panorâmicas de 50 pacientes avaliados antes, após o tratamento e n [...] o período de pós-contenção. Os pacientes foram tratados com extrações dos quatro primeiros pré-molares, e divididos em dois grupos: grupo 1, composto por 25 pacientes com segundo molares incluídos na mecânica ortodôntica; grupo 2, 25 pacientes cujos segundos molares não foram incluídos na mecânica ortodôntica. As angulações dos primeiros e segundos molares inferiores foram comparadas nas fases estudadas utilizando-se a Análise de Variância (análise intragrupo) e o teste t independente (análise intergrupos). RESULTADOS: a análise intragrupo, realizada no grupo 2, demonstrou que ocorreu uma verticalização significativa dos primeiros e segundos molares inferiores durante o tratamento, que se manteve estável na fase de pós-contenção. Os resultados da análise intergrupos demonstraram diferenças significativas na angulação dos primeiros e segundos molares após o tratamento e na fase de pós-contenção. CONCLUSÃO: a inclusão dos segundos molares inferiores à mecânica ortodôntica apresenta-se relevante, não apenas para corrigir a angulação desses dentes, mas, também, para auxiliar a correção da angulação dos primeiros molares permanentes. Abstract in english OBJECTIVE: Evaluate axial mesiodistal inclinations of the mandibular molars in orthodontically treated cases, analyzing whether inclusion of second mandibular molars in treatment mechanics has any influence on final and postretention molars angulations. METHODS: The sample comprised 150 panoramic ra [...] diographs of 50 patients. Patients were treated with extraction of four first premolars and divided into 2 groups: Group 1 comprised 25 subjects without inclusion of mandibular second molars during orthodontic treatment, whereas Group 2 comprised 25 subjects with inclusion of mandibular second molars. Panoramic radiographs at three observation times were evaluated: pretreatment, posttreatment and postretention. The statistical analysis included one-way analysis of variance (ANOVA) for intragroup evaluation and independent t-tests for intergroup comparisons. RESULTS: Intragroup analysis demonstrated significant uprighting of mandibular first and second molars during treatment in Group 2, which remained stable during the postretention stage. Intergroup comparison demonstrated that Group 2 presented first and second molars significantly more uprighted in relation to Group 1 in both post-treatment and postretention stages. CONCLUSIONS: It was concluded that inclusion of mandibular second molars in the orthodontic mechanics is relevant not only to correct the angulation of these teeth, but also to aid mandibular first molars uprighting.

Luiz Filiphe Gonçalves, Canuto; Karina Maria Salvatores de, Freitas; Marcos Roberto de, Freitas; Rodrigo Hermont, Cançado.

2013-10-01

40

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  

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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

 
 
 
 
41

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  

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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

42

Cuartos molares supernumerarios: relato de caso clínico  

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Full Text Available 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.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 are 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

2006-04-01

43

Cuartos molares supernumerarios: relato de caso clínico  

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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

44

LITTERFALL AND NUTRIENT DEPOSITION IN A SEMI-DECIDUOS MOUNTAIN FOREST, AND IN EUCALYPTUS (Eucalyptus saligna) AND BRACATINGA (Mimosa scabrella) PLANTATIONS IN AREAS DEGRADED BY MINING  

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The nutrients elements N, P, K, Ca, and Mg were quantified in a semi-deciduos mountain forest, and in eucalyptus (Eucalyptus saligna) and “bracatinga” (Mimosa scaabrella) plantations in areas degraded by mining, close to Poços de Caldas- MG (21º47’13” S - 46º34’10” W).In the eucalyptus annual litterfall was 7,100 kg.ha-1 with 202.4 kg.ha-1 of N, 4.4 kg.ha-1 of P, 46.2 kg.ha-1 of K, 440.2 kg.ha-1 of Ca and 54.0 kg.ha-1 of Mg. In the semi-deciduos mountain forest the annual litte...

Jeferson Antônio de Souza; Antônio Cláudio Davide

2001-01-01

45

Removable molar power arm  

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Attachment of force elements from the gingival hook of maxillary molar tubes during the retraction of the anterior teeth is very common in orthodontic practice. As the line of force passes below the center of resistance (CR) of molar, it results its mesial tipping and also anchorage loss. To overcome this problem, the line of force should pass along the CR of molar. This article highlights a method to overcome this problem by attaching a removable power arm to the headgear tube of molar tube ...

Verma, Raj Kumar; Jena, Ashok Kumar; Singh, Satinder Pal; Utreja, Ashok Kuamr

2013-01-01

46

Removable molar power arm.  

Science.gov (United States)

Attachment of force elements from the gingival hook of maxillary molar tubes during the retraction of the anterior teeth is very common in orthodontic practice. As the line of force passes below the center of resistance (CR) of molar, it results its mesial tipping and also anchorage loss. To overcome this problem, the line of force should pass along the CR of molar. This article highlights a method to overcome this problem by attaching a removable power arm to the headgear tube of molar tube during the retraction of the anterior teeth. PMID:24124303

Verma, Raj Kumar; Jena, Ashok Kumar; Singh, Satinder Pal; Utreja, Ashok Kuamr

2013-07-01

47

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

48

Double inferior vena cava.  

Science.gov (United States)

Venous anomalies involving the inferior vena cava are very rare. The case of a 74-year-old man with coronary artery disease is presented. Interestingly, a double inferior vena cava was incidentally discovered during coronary artery bypass grafting. Persistence of the left hepatic segment vein appeared as a left inferior vena cava-a very rare condition. PMID:22698610

Tirilomis, Theodor

2012-06-01

49

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

50

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

51

Cornual molar ectopic pregnancy  

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Full Text Available The aim of this study is to present a rarely seen cornual molar ectopic pregnancy case regarding with literature. 36 years old patient with the third pregnancy was referred to our clinic with the prediagnosis of viable ectopic pregnancy. The patient had two vaginal delivery history and she had vaginal bleeding as spotting onwards fifteen days. Ultrasonographic assessment demonstrated ectopic pregnancy with positive fetal cardiac activity and 8mm crown-rump length (6W5D at right cornual region. The patient was performed cornotomy with laparotomy. Postoperative pathological evaluation was reported as a partial molar pregnancy. ?-human chorionic gonadotropin (?-hCG values declined dramatically and so additional treatment was not applied. Molar ectopic pregnancy findings are usually seen as conventional pregnancies and ?-hCG values and histopathological evaluation is important for correct diagnosis and follow up. [Int J Reprod Contracept Obstet Gynecol 2013; 2(4.000: 740-742

Bulent Cakmak

2013-08-01

52

Mandibular alveolar neurovascular bundle injury associated with impacted third molar surgery  

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Inferior alveolar neurovascular bundle (IANB) injury is one of the most common complications of third molar removal and involves important medicolegal issues. An accurate preoperative radiographic assessment of surgical difficulty is necessary to correctly plan the removal of impacted third molars and to estimate the risk of IANB injury. Therefore, the preoperative knowledge of the exact location of the third molar roots in relation to the mandibular canal is mandatory. A direct contact betwe...

Gallesio, Cesare

2010-01-01

53

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

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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

54

Secondary retention of molars  

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Eruption is the axial or occlusal movement of the tooth from its developmental position within the jaw to its functional position in the occlusal plane. lt continues throughout life to compensate for growth of the jaws and occlusal wear. Eruption disturbances of molars can lead to severe malocclusion, and to loss of the affected tooth and neighbouring teeth due to plaque accumulation followed by caries or periodontal disease. Secondary r tention refers to the cessation of eruption neither due...

Raghoebar, Gerry Max

1991-01-01

55

Cornual molar ectopic pregnancy  

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The aim of this study is to present a rarely seen cornual molar ectopic pregnancy case regarding with literature. 36 years old patient with the third pregnancy was referred to our clinic with the prediagnosis of viable ectopic pregnancy. The patient had two vaginal delivery history and she had vaginal bleeding as spotting onwards fifteen days. Ultrasonographic assessment demonstrated ectopic pregnancy with positive fetal cardiac activity and 8mm crown-rump length (6W5D) at right cornual regio...

Bulent Cakmak; Muhammet Toprak; Mehmet Can Nacar; Resid Dogan Koseoglu; Fazli Demirturk

2013-01-01

56

LITTERFALL AND NUTRIENT DEPOSITION IN A SEMI-DECIDUOS MOUNTAIN FOREST, AND IN EUCALYPTUS (Eucalyptus saligna AND BRACATINGA (Mimosa scabrella PLANTATIONS IN AREAS DEGRADED BY MINING  

Directory of Open Access Journals (Sweden)

Full Text Available The nutrients elements N, P, K, Ca, and Mg were quantified in a semi-deciduos mountain forest, and in eucalyptus (Eucalyptus saligna and “bracatinga” (Mimosa scaabrella plantations in areas degraded by mining, close to Poços de Caldas- MG (21º47’13” S - 46º34’10” W.In the eucalyptus annual litterfall was 7,100 kg.ha-1 with 202.4 kg.ha-1 of N, 4.4 kg.ha-1 of P, 46.2 kg.ha-1 of K, 440.2 kg.ha-1 of Ca and 54.0 kg.ha-1 of Mg. In the semi-deciduos mountain forest the annual litterfall was 4,490 kg.ha-1 with 245.2 kg.ha-1 of N, 10.3 kg.ha-1 of P, 39.5 kg.ha-1 of K, 292.8 kg.ha-1 of Ca and 57.5 kg.ha-1 of Mg, whereas in the “bracatinga” the annual litterfall was 3,460 kg.ha-1 with 217.6 kg.ha-1 of N, 11.1 kg.ha-1 of P, 11.4 kg.ha-1 of K, 194.1 kg.ha-1 of Ca and 25.3 kg.ha-1 of Mg. Therefore, the total quantity of mineral nutrients returned to the soil by litter decomposition is done according to the following sequences: Ca>N>Mg>K>P (semideciduos mountain forest andeucalyptus plantation and N>Ca>Mg>K>P (“bracatinga”. In the litter of bracatinga was detected the smallest quantity of K, Ca and Mg, while, the higher quantity of N and P was detected in eucalyptus. The litter decomposition coefficient was higher in the bracatinga and eucalyptus. The presence of P by coming from organic matter decomposition is bigger in bracatinga plantation, N and Mg in the semi-deciduos mountain forest, and K and Ca in eucalyptus plantations. The lowest rate of P was observed in eucalyptus.

Jeferson Antônio de Souza

2001-01-01

57

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

58

Molares impactados en la rama ascendente de la mandíbula. Presentación de un caso clínico  

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Se presenta el caso de una mujer de 23 años de edad que presentaba los molares inferiores permanentes segundo y tercero impactados verticalmente en la rama ascendente de la mandíbula. Las superficies oclusales de ambos dientes se encontraban en contacto. Tras un diagnóstico preciso, que incluyó una tomografía computarizada, se decidió extraer ambos dientes. El conducto del nervio dentario inferior, que en las radiografías se consideró que se encontraba bajo riesgo, no sufrió ningún ...

Valmaseda Castello?n, Eduardo; Rosa Gay, Mari?a Cristina La; Gay Escoda, Cosme

1998-01-01

59

Fusión de un tercer molar mandibular con un cuarto molar supernumerario / Fusion of mandibular third molar with supernumerary fourth molar  

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Full Text Available SciELO Spain | Language: Spanish Abstract in spanish La fusión dental es la unión de dos gérmenes dentales normalmente separados, mientras que la geminación se define como el intento de división de un único germen dental. La fusión y geminación de molares es poco frecuente en la dentición permanente. Describimos un caso clínico de un tercer molar infe [...] rior derecho fusionado a un cuarto molar supernumerario en un paciente varón de 36 años que ha presentado repetidos episodios de pericoronaritis. Tras el estudio radiológico se realiza la exodoncia del cordal semiincluido bajo anestesia local. Llevamos a cabo una revisión bibliográfica al respecto. Abstract in english Dental fusion is the union of two tooth buds that normally are separated, while gemination is defined as an attempt by a single tooth bud to divide. The fusion and gemination of molars is uncommon in permanent teeth. We report a clinical case of a right lower third molar fused to a supernumerary fou [...] rth molar in a 36-year-old male patient with repeated episodes of inflammation. After the radiologic study, the semi-impacted third molar was extracted under local anesthesia. The literature was reviewed.

C., López Carriches; I., Leco Berrocal; R., Baca Pérez-Bryan.

2008-10-01

60

The use of piezosurgery for mandibular third molar extraction  

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Full Text Available Introduction. Extraction of impacted mandibular third molars is often accompanied by intraoperative and postoperative complications such as damage of the inferior alveolar nerve, prolonged difficulty in mouth opening, alveolitis, pain and swelling in the region of surgery. The aim of this study was to compare two surgical techniques (standard and piezo in the extraction of mandibular third molars and to assess their postoperative complications. Material and Methods. Study included 16 patients (8 male and 8 female age 17 to 32 years treated in the period from 2012 to 2014. All patients had both mandibular molars impacted. One third molar was extracted using classical technique while the other one using a piezo device. Preoperative preparation was the same for all patients and included radiological analysis and verification of teeth by ortopan tomography (OPG and CT. Patients were assessed one, seven and 14 days after the procedure. Results. After the extraction, all patients were followed for postoperative symptoms: pain, swelling and paresthesia of the inferior alveolar nerve. The results confirmed advantages of piezosurgery in the removal of impacted mandibular third molars. Average duration of the intervention was 18 minutes with standard technique while the duration with piezo technique was 23 minutes. According to the visual-analog scale (VAS the average pain in the standard group was 9 whereas in the piezo group it was 6. Postoperative swelling was 10 mm (pronounced the first day after the procedure in the standard group while in the piezo group it was 6 mm (moderate. Conclusion. The use of piezo technology for the extraction of impacted wisdom teeth is reliable method which reduces the risk of the most common postoperative complications following mandibular wisdom teeth removal.

Tanaskovi? Nenad

2014-01-01

 
 
 
 
61

Consideraciones anatómicas del conducto alveolar inferior / Anatomical considerations of the inferior alveolar canal  

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish INTRODUCCIÓN: el conocimiento de variantes anatómicas del conducto alveolar inferior es necesario para la realización de procedimientos que involucren la mandíbula. El objetivo fue determinar las relaciones y variaciones anatómicas del conducto alveolar inferior MÉTODOS: se hizo un estudio descripti [...] vo, en 50 hemimandíbulas humanas secas, midiendo distancias del foramen mandibular con respecto a los bordes anterior, posterior, inferior y escotadura sigmoidea, las distancias del agujero mentoniano al borde basal y la cresta alveolar. Se hicieron cortes en la rama y el cuerpo, para determinar las relaciones con estructuras anatómicas próximas. RESULTADOS: el foramen mandibular fue encontrado en el 88% en el tercio medio de rama. La distancia del foramen a la escotadura fue 19,78 ± 3,3 mm, al borde anterior 17,46 ± 3,04, al borde posterior 12,2 ± 1,9 y al borde basal 26,4 ± 3,8 mm. La ubicación del conducto alveolar inferior a nivel de rama respecto a los bordes anterior, posterior, lateral y medial fue 11,1 ± 2,6, 15,8 ± 2,7, 3,5 ± 1,0 y 1,9 ± 0,7 mm respectivamente. En el cuerpo mandibular la distancias respecto a los bordes basal, lateral, medial y alveolar fueron 10,1 ± 2,3, 4,7 ± 1,4, 2,5 ± 1,0 y 13,7 ± 2,7 mm respectivamente distal al tercer molar, 7,6 ± 1,7, 6,4 ± 1,4, 2,8 ± 1,0 y 16,4 ± 2,2 mm distal al segundo molar, 7,1 ± 1,5, 6,1 ± 1,3, 2,6 ± 0,8 y 17,0 ± 2,3 mm distal al primer molar, y 7,9 ± 1,7, 4,7 ± 1,2, 3,4 ± 1,2 y 18.3±2.7 mm distal al segundo premolar. El diámetro fue 2,82 ± 0,6 mm. La distancia del agujero mentoniano al borde basal fue 14,2 ± 1,59 mm, a la cresta alveolar 15,97 ± 2,87 mm, y se relacionó con el segundo premolar. CONCLUSIONES: los datos obtenidos, si bien, no infieren en la totalidad de la población colombiana, confirma que existen variaciones anatómicas del conducto alveolar inferior diferentes a las descritas en otras poblaciones. Abstract in english INTRODUCTION: the knowledge of anatomical variations of the inferior alveolar canal is necessary for surgical procedures involving the mandible. The purpose was to determine the relationships and anatomical variations of the mandibular canal. METHODS: a descriptive study was performed using 50 dry m [...] andibles measuring distances of the mandibular foramen with respect to the anterior posterior and lower borders and the sigmoid notch, distances from the mental foramen to the basal border and the alveolar crest. Cuts were done in ramus and body to determine the relationship with close anatomical structures. RESULTS: The mandibular foramen was found in 88% of the cases in the middle third of ramus. The distance from the foramen to the sigmoid notch was 19.78 ± 3.3 mm, to the anterior border was 17.46 ± 3.04 mm, to the posterior border was 12.2 ± 1.9 mm and to the inferior border was 26.4 ± 3.8 mm. The location of the inferior alveolar canal on the mandibular ramus with respect to the anterior, posterior, lateral and medial borders were 11.1 ± 2.6 mm, 15.8 ± 2.7 mm, 3.5 ±1.0 mm y 1.9 ± 0.7 mm respectively. On the mandibular body, the distances from the inferior alveolar canal to the inferior, lateral, medial and alveolar borders were 10.1 ± 2.3 mm, 4.7 ± 1.4 mm, 2.5 ± 1.0 mm and 13.7±2.7 mm respectively distal to the third molar, 7.6 ± 1.7 mm, 6.4 ± 1.4 mm, 2.8 ± 1.0 mm and 16.4 ± 2.2 mm distal to the second molar, 7.1 ± 1.5 mm, 6.1 ± 1.3 mm, 2.6 ± 0.8 mm and 17.0 ± 2.3 mm distal to the first molar, and 7.9 ± 1.7 mm, 4.7 ± 1.2 mm, 3.4 ± 1.2 mm and 18.3 ± 2.7 mm distal to the second bicuspid. The diameter was 2.82 ± 0.6 mm. The distance from the mental foramen to the inferior border was 14.2 ± 1.59 mm, to the alveolar crest was 15.97 ± 2.87 mm, and it was directly related to the second bicuspid. CONCLUSIONS: The data obtained, even though, do not infer in the totality of the Colombian population, confirms that there are anatomical variations of the inferior alveolar canal different from the ones

Omar Yamid, Ruge Jiménez; Oscar Andrés, Camargo Cañón; Yudy, Patricia Ortiz.

2009-07-01

62

Third molar extraction. Current trends.  

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Extraction of third molars is the operation most frequently performed by oral and maxillofacial surgeons. The American National Institute of Health (1979) and the American Association of Oral and Maxillofacial Surgeons (1993) have organised consensus conferences to systematically analyse the scientific evidence and provide official guidelines for the management of third molars. However, some clinical aspects are still controversial: indications for preventive extraction, early extraction, pro...

Pasqualini, Damiano

2002-01-01

63

Mandibular Third Molar Impaction: Review of Literature and a Proposal of a Classification  

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Full Text Available Objectives: The purpose of present article was to review impacted mandibular third molar aetiology, clinical anatomy, radiologic examination, surgical treatment and possible complications, as well as to create new mandibular third molar impaction and extraction difficulty degree classification based on anatomical and radiologic findings and literature review results.Material and Methods: Literature was selected through a search of PubMed, Embase and Cochrane electronic databases. The keywords used for search were mandibular third molar, impacted mandibular third molar, inferior alveolar nerve injury third molar, lingual nerve injury third molar. The search was restricted to English language articles, published from 1976 to April 2013. Additionally, a manual search in the major anatomy and oral surgery journals and books was performed. The publications there selected by including clinical and human anatomy studies.Results: In total 73 literature sources were obtained and reviewed. Impacted mandibular third molar aetiology, clinical anatomy, radiographic examination, surgical extraction of and possible complications, classifications and risk factors were discussed. New mandibular third molar impaction and extraction difficulty degree classification based on anatomical and radiologic findings and literature review results was proposed. Conclusions: The classification proposed here based on anatomical and radiological impacted mandibular third molar features is promising to be a helpful tool for impacted tooth assessment as well as for planning for surgical operation. Further clinical studies should be conducted for new classification validation and reliability evaluation.

Gintaras Juodzbalys

2013-06-01

64

El tercer molar: aspectos periodontales a considerar en el tercer milenio / The third molar: some periodontal topics to be analyzed in the third millenium  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: Spanish Abstract in spanish A pesar del avance en los conocimientos clínicos y terapéuticos en Periodoncia, el manejo clínico de los terceros molares, desde el punto de vista periodontal, sigue siendo controvertido. En el presente artículo se analizan los condicionantes que llevarían a la pérdida de soporte periodontal por imp [...] actación de terceros molares inferiores, así como los procedimientos terapéuticos más adecuados desde el punto de vista de la evidencia científica. Abstract in english Despite the advances achieved in the clinical and therapeutic knowledge of Periodontics, the clinical management of third molars remains controversial from a periodontal point of view. In the present paper, the features leading to loss of periodontal support associated to impacted lower third molars [...] and the most appropriate therapeutic procedures are analysed based on the available scientific evidence.

Guillermo, Machuca Portillo.

2002-04-01

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DENS INVAGINATUS BILATERAL EM PRIMEIRO MOLAR MANDIBULAR EM CÃO  

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Full Text Available Atendeu-se a uma cadela da raça maltês, de quatro anos de idade, com queixa de mau hálito e presença de tártaros. À anamnese relatou-se que o animal havia sido submetida anteriormente a três procedimentos de tratamento periodontal, sempre sem a necessidade de anestesia. Submetida à anestesia geral, a cadela foi clinicamente examinada, evidenciando-se a presença de lesão degenerativa na face vestibular dos primeiros molares mandibulares esquerdo e direito, que após exame radiológico diagnosticou-se como Dens invaginatus. Observou-se alteração da morfologia dentária dos dentes envolvidos, evidenciada radiograficamente como áreas radiopacas, demonstrando alteração da morfologia do canal em ambos os elementos e reabsorção da raiz distal do primeiro pré-molar inferior direito. PALAVRAS-CHAVE: Dens invaginatus, dens in dente, exodontia.

Floriano Pinheiro Silva

2006-10-01

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Molarization of mandibular second premolar.  

Science.gov (United States)

Macrodontia (megadontia, megalodontia, mac rodontism) is a rare shape anomaly that has been used to describe dental gigantism. Mandibular second premolars show an elevated variability of crown morphology, as are its eruptive potential and final position in the dental arch. To date, only eight cases of isolated macrodontia of second premolars have been reported in the literature. This case report presents clinical and radiographic findings of unusual and rare case of isolated unilateral molarization of left mandibular second premolar. How to cite this article: Mangla N, Khinda VIS, Kallar S, Brar GS. Molarization of Mandibular Second Premolar. Int J Clin Pediatr Dent 2014;7(2):137-139. PMID:25356014

Mangla, Neha; Singh Khinda, Vineet Inder; Kallar, Shiminder; Singh Brar, Gurlal

2014-05-01

67

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

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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

69

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)

70

Anaesthetic Challenges in Molar Pregnancy  

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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

71

Anaesthetic Challenges in Molar Pregnancy  

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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

72

Evaluation of Dental Eruption of Third Molars in the Length of Mandible Evaluación de la Erupción Dentaria de los Terceros Molares en Relación a la Longitud de la Mandíbula  

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Full Text Available The aim of this work was to evaluate the eruption of the third molar teeth in the length of the mandible using the orthodontic documentation obtained between 2005 and 2006 as sampling method, a total of 193 cases of both sexes. The cephalometric analysis and panoramic radiographic studies were chosen from two clinics randomly selected in the city of Recife ­ Pernambuco - Brazil. It was analyzed the linear size of mandibular bone by the use of McNamara's Cephalometric Analysis, and also the presence or not of dental retention of inferior third molar teeth with the help of panoramic radiographic study, evaluating the commitment of these retentions with the effective length of mandible. The work concluded that when the effective mandibular length is small induces a dental retention of these third molars, mostly the left inferior third molar, which 46.5% of the cases was observed as retained. However, in 53.8% of the cases was observed the absence or no-formation of these dental germs for the left inferior third molar and 60% for the right, showing a big size of the effective length of the mandible exposing that the no-formation of these teeth was not directly related to the lack of space in the dental arch. The study demonstrated that the sexual dimorphism does not influence the eruption of these teeth, however, according to age, was emphasized a dependence concerning about dental eruption, retention or absence of left inferior third molar.El objetivo de la presente investigación fue evaluar la erupción del tercer molar a lo largo de la mandíbula usando documentación de ortodoncia obtenida entre los años 2005 y 2006, en un total de 193 casos de individuos brasileños, adultos, de ambos sexos. El análisis cefalométrico y los estudios radiográficos panorámicos fueron obtenidos de dos clínicas y seleccionados al azar en la ciudad de Recife, Estado de Pernambuco, Brasil. Se analizó el tamaño linear de la mandíbula usando el método cefalómetrico de McNamara, y también la presencia o ausencia de retención dental del tercer molar inferior con la ayuda de radiografías panorámicas, evaluando la relación de esas retenciones, si las hubiere, con la longitud efectiva de la mandíbula. Los resultados muestran que cuando la longitud mandibular efectiva es pequeña induce a retención dental de los terceros molares, siendo en la mayoría de los casos el tercer molar inferior izquierdo, lo cual fue obervado en 46,5 % . Sin embargo, en el 53,8 % de los casos se observó ausencia o no formación de los gérmenes dentales del molar mencionado, característica que se encontró en 60 % en el lado derecho, mostrando un gran tamaño de longitud efectiva de la mandíbula, indicando que la no formación de ese molar no fue directamente relacionada a un reducido espacio en el arco dental. El estudio demostró que el dimorfismo sexual no influencia la erupción de ese molar, sin embargo, la variable edad, resaltó una dependencia relacionada con la erupción dental, retención o ausencia del tercer molar inferior izquierdo.

Gilberto de Sousa Filho

2009-12-01

73

Evaluation of Dental Eruption of Third Molars in the Length of Mandible / Evaluación de la Erupción Dentaria de los Terceros Molares en Relación a la Longitud de la Mandíbula  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish El objetivo de la presente investigación fue evaluar la erupción del tercer molar a lo largo de la mandíbula usando documentación de ortodoncia obtenida entre los años 2005 y 2006, en un total de 193 casos de individuos brasileños, adultos, de ambos sexos. El análisis cefalométrico y los estudios ra [...] diográficos panorámicos fueron obtenidos de dos clínicas y seleccionados al azar en la ciudad de Recife, Estado de Pernambuco, Brasil. Se analizó el tamaño linear de la mandíbula usando el método cefalómetrico de McNamara, y también la presencia o ausencia de retención dental del tercer molar inferior con la ayuda de radiografías panorámicas, evaluando la relación de esas retenciones, si las hubiere, con la longitud efectiva de la mandíbula. Los resultados muestran que cuando la longitud mandibular efectiva es pequeña induce a retención dental de los terceros molares, siendo en la mayoría de los casos el tercer molar inferior izquierdo, lo cual fue obervado en 46,5 % . Sin embargo, en el 53,8 % de los casos se observó ausencia o no formación de los gérmenes dentales del molar mencionado, característica que se encontró en 60 % en el lado derecho, mostrando un gran tamaño de longitud efectiva de la mandíbula, indicando que la no formación de ese molar no fue directamente relacionada a un reducido espacio en el arco dental. El estudio demostró que el dimorfismo sexual no influencia la erupción de ese molar, sin embargo, la variable edad, resaltó una dependencia relacionada con la erupción dental, retención o ausencia del tercer molar inferior izquierdo. Abstract in english The aim of this work was to evaluate the eruption of the third molar teeth in the length of the mandible using the orthodontic documentation obtained between 2005 and 2006 as sampling method, a total of 193 cases of both sexes. The cephalometric analysis and panoramic radiographic studies were chose [...] n from two clinics randomly selected in the city of Recife ­ Pernambuco - Brazil. It was analyzed the linear size of mandibular bone by the use of McNamara's Cephalometric Analysis, and also the presence or not of dental retention of inferior third molar teeth with the help of panoramic radiographic study, evaluating the commitment of these retentions with the effective length of mandible. The work concluded that when the effective mandibular length is small induces a dental retention of these third molars, mostly the left inferior third molar, which 46.5% of the cases was observed as retained. However, in 53.8% of the cases was observed the absence or no-formation of these dental germs for the left inferior third molar and 60% for the right, showing a big size of the effective length of the mandible exposing that the no-formation of these teeth was not directly related to the lack of space in the dental arch. The study demonstrated that the sexual dimorphism does not influence the eruption of these teeth, however, according to age, was emphasized a dependence concerning about dental eruption, retention or absence of left inferior third molar.

Gilberto de, Sousa Filho; Adelmar Afonso de, Amorim Júnior; Carla Cabral dos Santos Accioly, Lins; Joaquim Celestino da, Silva Neto.

1319-13-01

74

La hiperdontia en región de molares Hyperdontia in molar region  

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Full Text Available La hiperdontia constituye una de las anomalías más estudiadas de la dentición humana. Esa alteración representa la aparición de uno o más dientes en cantidades mayores de lo normal, que puede ocurrir en la mandíbula o maxila y de manera unilateral o bilateral. La etiología de los dientes supernumerarios puede ser explicada principalmente por hiperactividad de la lámina dentaria en la fase inicial. Es importante la detección precoz de dientes supernumerarios porque se ha visto una serie de complicaciones como los diastemas, que pueden causar en la cavidad bucal: retardo de la erupción o dientes impactados, posicionamiento inadecuado de dientes permanentes, desajuste oclusal y el desarrollo de quistes y tumores odontógenos. Así el diagnóstico es normalmente realizado a partir de un examen radiográfico convencional, principalmente la radiografía panorámica. Este trabajo tuvo como objetivo relatar 4 casos clínicos de pacientes con presencia de molares supernumerarios, que fueron atendidos en el Servicio de Radiología de la Escuela de Odontología de la Universidad Federal de Ceará.Hyperdontia is one of the more studied anomalies of human dentition. This alteration represents the appearance of one or more teeth in a number greater of normal, occurring in mandible or in maxilla and could be unilateral or bilateral. The etiology of supernumerary teeth may be explained mainly due to the hyperactivity of dental plate in its initial phase; its early detection is important because of there have been a series of complications that may to cause diastemata, eruption retard or impacted teeth, inappropriate positioning of permanent teeth, occlusal misalignment and the development of odontogenic cysts or tumors. Thus, the diagnosis is normally made from a conventional radiographic examination, mainly the panoramic X-ray. The objective of present paper is the present four clinical cases of patients presenting with supernumerary molars, seen in the Radiology Service during the course of stomatology of the Federal University of Ceará.

George Táccio de Miranda Candeiro

2011-12-01

75

La hiperdontia en región de molares / Hyperdontia in molar region  

Scientific Electronic Library Online (English)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish La hiperdontia constituye una de las anomalías más estudiadas de la dentición humana. Esa alteración representa la aparición de uno o más dientes en cantidades mayores de lo normal, que puede ocurrir en la mandíbula o maxila y de manera unilateral o bilateral. La etiología de los dientes supernumera [...] rios puede ser explicada principalmente por hiperactividad de la lámina dentaria en la fase inicial. Es importante la detección precoz de dientes supernumerarios porque se ha visto una serie de complicaciones como los diastemas, que pueden causar en la cavidad bucal: retardo de la erupción o dientes impactados, posicionamiento inadecuado de dientes permanentes, desajuste oclusal y el desarrollo de quistes y tumores odontógenos. Así el diagnóstico es normalmente realizado a partir de un examen radiográfico convencional, principalmente la radiografía panorámica. Este trabajo tuvo como objetivo relatar 4 casos clínicos de pacientes con presencia de molares supernumerarios, que fueron atendidos en el Servicio de Radiología de la Escuela de Odontología de la Universidad Federal de Ceará. Abstract in english Hyperdontia is one of the more studied anomalies of human dentition. This alteration represents the appearance of one or more teeth in a number greater of normal, occurring in mandible or in maxilla and could be unilateral or bilateral. The etiology of supernumerary teeth may be explained mainly due [...] to the hyperactivity of dental plate in its initial phase; its early detection is important because of there have been a series of complications that may to cause diastemata, eruption retard or impacted teeth, inappropriate positioning of permanent teeth, occlusal misalignment and the development of odontogenic cysts or tumors. Thus, the diagnosis is normally made from a conventional radiographic examination, mainly the panoramic X-ray. The objective of present paper is the present four clinical cases of patients presenting with supernumerary molars, seen in the Radiology Service during the course of stomatology of the Federal University of Ceará.

George Táccio, de Miranda Candeiro; Julio Ricardo, Velásquez Lopez; Julissa Janet, Robles Ruiz.

2011-12-01

76

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

77

[Molar pregnancy (primary or recurrent?)].  

Science.gov (United States)

A peculiar case of gestational trophoblastic disease is described. A 24 year old female with former history of three molar pregnancies, spontaneous abortion and anembryoic pregnancy was admitted because of a newly diagnosed hydatiform mole (ex novo). After uterine curettage followed by a low oral dose of methotrexate (0.5 mg/kg/day) for five days. The HCG levels determined in plasma by beta-HCG- radioinmmunoassay, became negative until four months of follow3 up. An intrauterine device was installed. She resumed HCG positivity a year later and a histerectomy was performed. A post-surgical diagnosis of invasive mole was made. Since the possibility of intercurrent pregnancy was lowered by the presence of a intrauterine device, we assumed that trophoblastic transformation into an invasive mole adopted a sort of dormant period before its resurge (resurrection) independently either from curettage of chemotherapy. PMID:2562106

Ayala, A; Aizpuru, E; Tovar, J M

1989-08-01

78

[Hyperthyroidism induced by molar pregnancy].  

Science.gov (United States)

A case is reported of a Senegalese patient admitted for hydatiform mole. The serum human chorionic gonadotrophin concentration (hCG) was 900,000 UI.l-1. The patient was recognized to be clinically hyperthyroid with raised T4 and T3 values, but a very low TSH concentration. After two days of beta adrenergic blockade and carbimazole, a suction curettage was performed under general anaesthesia. Propranolol was again administered 6 hours after the surgery. Thyroid function returned to normal level two weeks after removal of the mole, suggesting that hCG was responsible for the thyrotoxicosis. Serum hCG concentrations closely paralleled those of free thyroxine, but the correlation was difficult to assess because of carbimazole. Clinical thyrotoxicosis is rare in molar pregnancy. The diagnosis being made in semi-urgent conditions, this raises the question of how to obtain rapid stabilization of the disease before surgery. PMID:8273931

Laurent, V; Besson, L; Doussin, J F; Rondelet, B; Banssillon, V

1993-01-01

79

Cuartos molares supernumerarios: relato de caso clínico  

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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...

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

2006-01-01

80

The adaptive value of shoot differentiation in deciduous trees and its evolutionary relevance / Valor adaptativo de la diferenciación de brotes en árboles deciduos y su relevancia evolutiva  

Scientific Electronic Library Online (English)

Full Text Available SciELO Argentina | Language: English Abstract in spanish En Angiospermas arbóreas deciduas, es común encontrar un alto grado de diferenciación entre brotes largos y brotes cortos. También se presenta esta característica en un número de gimnospermas y en muy pocas angiospermas arbóreas siempreverdes. El estudio de 719 especies de angiospermas arbóreas (602 [...] deciduas y 117 siempreverdes) demostró que la condición decidua está casi siempre asociada a la diferenciación de los brotes. Mediciones detalladas en 38 angiospermas demostraron que la totalidad del área foliar de un brote corto es semejante al área foliar de una hoja de un brote largo de la misma especie y del mismo individuo. En los pocos casos en que el área foliar del brote corto es levemente mayor que el área de una hoja de un brote largo, las hojas del brote corto se sombrean entre sí de manera que el área proyectada del brote corto se asemeja a la de la hoja del brote largo. Cálculos de la biomasa de tallo necesaria para soportar una determinada superficie asimilatoria mostraron dos aspectos interesantes. Primero, que la biomasa de tallo (peso seco) de soporte del área foliar is alrededor de 10 veces menor en brotes cortos que en brotes largos. Segundo, que esta biomasa en brotes largos y brotes cortos parece ser independiente de la especie. En cuanto a la eficiencia estructural de los brotes, el tamano y la forma de las hojas no son relevantes. Algunas especies siempreverdes se asemejan en todos sus parámetros más a las especies deciduas que a especies siempreverdes típicas. Datos fitogeográficos así como datos morfológicos sugieren que estas especies siempreverdes atípicas derivaron de ancestros deciduos. Como todos los parámetros medidos difieren notablemente entre todas las gimnospermas, excepto Ginkgo, y las angiospermas, suponemos que el camino evolutivo que condujo a la diferenciación de brotes fue diferente en gimnospermas y angiospermas. Abstract in english Pronounced long shoot/short shoot differentiation is typical for deciduous angiosperm trees. It also occurs in a number of gymnosperms and very few evergreen angiosperm trees. The study of 719 angiosperm tree species (602 deciduous and 117 evergreen species) demonstrated that the deciduous condition [...] is nearly always associated with shoot differentiation. Detailed measurements in 38 angiosperms showed that the leaf area of an entire short shoot equals the leaf area of a single long shoot leaf of the same species and individual. In the few cases where the leaf area of the short shoot is slightly larger than that of a single long-shoot leaf, the short shoot leaves shade each other and the projection of the short shoot equals the area of a single long shoot leaf. Calculations of the stem biomass needed to expose a given assimilatory surface show two interesting aspects. First, the stem biomass (dry weight) to expose leaf surface is about 10 times less in short shoots than in long shoots. Second, this biomass in long shoots and short shoots appears to be species independent. Regarding shoot structure efficiency, leaf size and shape do not matter. Some evergreen species resemble in all parameters more to deciduous species than to typical evergreen species. Phytogeographical data as well as morphological data suggest that these atypical evergreen species are derived from deciduous ancestors. As measured parameters differ markedly between all gymnosperms, except Ginkgo, and angiosperms, we suppose that the evolutionary pathway leading to shoot differentiation was different for gymnosperms and angiosperms.

Veit M., Dörken; Thomas, Stützel.

2009-12-01

 
 
 
 
81

The adaptive value of shoot differentiation in deciduous trees and its evolutionary relevance Valor adaptativo de la diferenciación de brotes en árboles deciduos y su relevancia evolutiva  

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Full Text Available Pronounced long shoot/short shoot differentiation is typical for deciduous angiosperm trees. It also occurs in a number of gymnosperms and very few evergreen angiosperm trees. The study of 719 angiosperm tree species (602 deciduous and 117 evergreen species demonstrated that the deciduous condition is nearly always associated with shoot differentiation. Detailed measurements in 38 angiosperms showed that the leaf area of an entire short shoot equals the leaf area of a single long shoot leaf of the same species and individual. In the few cases where the leaf area of the short shoot is slightly larger than that of a single long-shoot leaf, the short shoot leaves shade each other and the projection of the short shoot equals the area of a single long shoot leaf. Calculations of the stem biomass needed to expose a given assimilatory surface show two interesting aspects. First, the stem biomass (dry weight to expose leaf surface is about 10 times less in short shoots than in long shoots. Second, this biomass in long shoots and short shoots appears to be species independent. Regarding shoot structure efficiency, leaf size and shape do not matter. Some evergreen species resemble in all parameters more to deciduous species than to typical evergreen species. Phytogeographical data as well as morphological data suggest that these atypical evergreen species are derived from deciduous ancestors. As measured parameters differ markedly between all gymnosperms, except Ginkgo, and angiosperms, we suppose that the evolutionary pathway leading to shoot differentiation was different for gymnosperms and angiosperms.En Angiospermas arbóreas deciduas, es común encontrar un alto grado de diferenciación entre brotes largos y brotes cortos. También se presenta esta característica en un número de gimnospermas y en muy pocas angiospermas arbóreas siempreverdes. El estudio de 719 especies de angiospermas arbóreas (602 deciduas y 117 siempreverdes demostró que la condición decidua está casi siempre asociada a la diferenciación de los brotes. Mediciones detalladas en 38 angiospermas demostraron que la totalidad del área foliar de un brote corto es semejante al área foliar de una hoja de un brote largo de la misma especie y del mismo individuo. En los pocos casos en que el área foliar del brote corto es levemente mayor que el área de una hoja de un brote largo, las hojas del brote corto se sombrean entre sí de manera que el área proyectada del brote corto se asemeja a la de la hoja del brote largo. Cálculos de la biomasa de tallo necesaria para soportar una determinada superficie asimilatoria mostraron dos aspectos interesantes. Primero, que la biomasa de tallo (peso seco de soporte del área foliar is alrededor de 10 veces menor en brotes cortos que en brotes largos. Segundo, que esta biomasa en brotes largos y brotes cortos parece ser independiente de la especie. En cuanto a la eficiencia estructural de los brotes, el tamano y la forma de las hojas no son relevantes. Algunas especies siempreverdes se asemejan en todos sus parámetros más a las especies deciduas que a especies siempreverdes típicas. Datos fitogeográficos así como datos morfológicos sugieren que estas especies siempreverdes atípicas derivaron de ancestros deciduos. Como todos los parámetros medidos difieren notablemente entre todas las gimnospermas, excepto Ginkgo, y las angiospermas, suponemos que el camino evolutivo que condujo a la diferenciación de brotes fue diferente en gimnospermas y angiospermas.

Veit M. Dörken

2009-12-01

82

Inferiorization and "Self-Esteem"  

Science.gov (United States)

In this century, the concept of the self-esteem of subordinated groups was transformed from its original orientation toward coping strategies to inferiorization; to a psychological construct of the personalities of subordinated people; and to a rejection of any view which could move into the perspective of blaming the victim. (BW)

Adam, Barry D.

1978-01-01

83

Treating Intraradicular Pockets of molars  

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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

84

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  

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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

85

Antibiotics in third molar surgery.  

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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 (pantibiotics. 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

86

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

87

Detection of Root Canal Isthmuses in Molars by Map-Reading Dynamic using CBCT images  

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Full Text Available SciELO Brazil | Language: English Abstract in portuguese O objetivo deste estudo foi detectar a presença de istmos em molares superiores e inferiores, e avaliar a frequência usando dinâmica de navegação em imagens de tomografia computadorizada de feixe cônico (TCFC). Duzentos molares superiores e inferiores humanos foram usados em ensaio ex vivo. Uma amos [...] tra consecutiva de duzentos molares (superiores e inferiores, primeiros e segundos) foi selecionada a partir de exames de TCFC. Os istmos foram detectados a partir do orifício de entrada da cavidade pulpar em direção ao ápice, de acordo com o início e o fim, nas categorias: 1. início e término no terço cervical; 2. início no terço cervical e término no terço médio; 3. início no terço cervical e término no terço apical; 4. início e fim no terço médio; 5. início no terço médio e término no terço apical; 6. início e término no terço apical ; 7. ausência de istmo radicular. Os exames de TCFC foram obtidos em diferentes planos com estratégias de navegação em cortes axiais de 0,5 mm/0.5 mm de coronal para a direção apical. As frequências de istmo radicular foram analisadas de acordo com o terço da raiz e avaliadas pelo teste do qui-quadrado. O nível de significância estabelecido foi de 5%. A presença de istmo radicular em molares superiores foi de 86% em ensaio ex vivo e 62% em ensaio in vivo, enquanto que, em molares inferiores foram observados 70% em ensaio ex vivo e 72% em ensaio vivo. A frequência radicular de istmo foi elevada em ambos os modelos de estudo. A dinâmica da estratégia de navegação em imagens de TCFC é precisa para detectar a localização do istmo radicular. Abstract in english The aim of this study was to detect root isthmuses in maxillary and mandibular molars and evaluate their frequencies using map-reading dynamics in CBCT images. Two hundred extracted human maxillary and mandibular molars were used in ex vivo assay. A consecutive sample of two hundred maxillary and ma [...] ndibular molars (first and second) was selected from CBCT exams. The isthmuses were detected from the pulp orifice to the apex and were recorded according to their beginning and their end, into categories: 1. begin and end in cervical third; 2. beginning in cervical third and end in middle third; 3. beginning in cervical third and end in apical third; 4. beginning and end in middle third; 5. begin in middle third and end in apical third; 6. beginning and end in apical third; 7. no isthmus. The scans were obtained in different planes with map-reading in axial slices of 0.5 mm/0.5 mm involved the coronal to apical direction. The frequencies of isthmus were analyzed according to the level of root and evaluated by Chi-square test. The level of significance was set at ?=0.05. The presence of isthmus detected in maxillary molars was 86% in ex vivo assay and 62% in vivo assay, whereas in mandibular molars was observed 70% in ex vivo assay and 72% in vivo assay. The frequency of isthmus was high in both study models. The map-reading dynamics in CBCT images was found to be precise to detect the localization of isthmus.

Jesus Djalma, Pecora; Carlos, Estrela; Mike Reis, Bueno; Olavo Cesar, Porto; Ana Helena Goncalves, Alencar; Manoel Damiao, Sousa-Neto; Cyntia Rodrigues de Araujo, Estrela.

2013-12-01

88

Third molars: a threat to periodontal health??  

Science.gov (United States)

The third molars have received the fair amount of interest in literature. It has been blamed for problems such as-lower incisor crowding, atypical facial pain, caries etc. They are considered as 'waste bins' in dental practices as they are regarded as functionally non-essential. While making the clinical decision, they are given less importance and often extraction is considered to be the treatment option. Despite periodontal problems that can arise with extracted third molars, retention of third molars can also lead to periodontal problems with the adjacent teeth in addition to teeth farther to third molars. Of late, it is very important to consider the periodontal problems while making the clinical decision. This review paper has been discussed keeping this as prime objective. PMID:23730073

Kaveri, G S; Prakash, Shobha

2012-06-01

89

Lingual exposure during mandibular third molar surgery.  

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The necessity for surgical exposure of the lingual aspect of mandibular third molars will vary according to the severity of the impaction and the surgical technique adopted. A retractor is described for use in those cases when major lingual retraction is required. The retractor provides optimum access to the mandibular third molar area with adequate protection for the lingual nerve, tongue retraction and enhanced illumination by light reflection. It can be used under both local and general anaesthesia. PMID:415017

Stacy, G C

1977-12-01

90

Third Molars: A Threat to Periodontal Health??  

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The third molars have received the fair amount of interest in literature. It has been blamed for problems such as—lower incisor crowding, atypical facial pain, caries etc. They are considered as ‘waste bins’ in dental practices as they are regarded as functionally non-essential. While making the clinical decision, they are given less importance and often extraction is considered to be the treatment option. Despite periodontal problems that can arise with extracted third molars, retentio...

Kaveri, G. S.; Prakash, Shobha

2011-01-01

91

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  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 pero 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 fís...

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

2011-01-01

92

Subcutaneous emphysema during third molar surgery: a case report  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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.

93

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

94

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 [...  

Directory of Open Access Journals (Sweden)

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

95

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

96

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

Science.gov (United States)

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

97

Molar heat capacity and molar excess enthalpy measurements in aqueous amine solutions  

Science.gov (United States)

Experimental measurements of molar heat capacity and molar excess enthalpy for 1, 4-dimethyl piperazine (1, 4-DMPZ), 1-(2-hydroxyethyl) piperazine (1, 2-HEPZ), I-methyl piperazine (1-MPZ), 3-morpholinopropyl amine (3-MOPA), and 4-(2-hydroxy ethyl) morpholine (4, 2-HEMO) aqueous solutions were carried out in a C80 heat flow calorimeter over a range of temperatures from (298.15 to 353.15) K and for the entire range of the mole fractions. The estimated uncertainty in the measured values of the molar heat capacity and molar excess enthalpy was found to be +/- 2%. Among the five amines studied, 3-MOPA had the highest values of the molar heat capacity and 1-MPZ the lowest. Values of molar heat capacities of amines were dominated by --CH 2, --N, --OH, --O, --NH2 groups and increased with increasing temperature, and contributions of --NH and --CH 3 groups decreased with increasing temperature for these cyclic amines. Molar excess heat capacities were calculated from the measured molar heat capacities and were correlated as a function of the mole fractions employing the Redlich-Kister equation. The molar excess enthalpy values were also correlated as a function of the mole fractions employing the Redlich-Kister equation. Molar enthalpies at infinite dilution were derived. Molar excess enthalpy values were modeled using the solution theory models: NRTL (Non Random Two Liquid) and UNIQUAC (UNIversal QUAsi Chemical) and the modified UNIFAC (UNIversal quasi chemical Functional group Activity Coefficients - Dortmund). The modified UNIFAC was found to be the most accurate and reliable model for the representation and prediction of the molar excess enthalpy values. Among the five amines, the 1-MPZ + water system exhibited the highest values of molar excess enthalpy on the negative side. This study confirmed the conclusion made by Maham et al. (71) that -CH3 group contributed to higher molar excess enthalpies. The negative excess enthalpies were reduced due to the contribution of --O and --OH groups in 3-MOPA; 1, 2-HEPZ and 4, 2-HEMO. Conclusions made by Maham et al. (71 ) stating that the interaction between water (--OH group) and diethylamine (--NH group) was more dominant than the interactions between --OH groups from water and alcohol molecules were supported by this study for cyclic amines.

Poozesh, Saeed

98

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: 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

99

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  

Directory of Open Access Journals (Sweden)

Full Text Available 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.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 groups, 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

2000-06-01

100

Molar and molecular views of choice.  

Science.gov (United States)

The molar and molecular views of behavior are not different theories or levels of analysis; they are different paradigms. The molecular paradigm views behavior as composed of discrete units (responses) occurring at moments in time and strung together in chains to make up complex performances. The discrete pieces are held together as a result of association by contiguity. The molecular view has a long history both in early thought about reflexes and in associationism, and, although it was helpful to getting a science of behavior started, it has outlived its usefulness. The molar view stems from a conviction that behavior is continuous, as argued by John Dewey, Gestalt psychologists, Karl Lashley, and others. The molar paradigm views behavior as inherently extended in time and composed of activities that have integrated parts. In the molar paradigm, activities vary in their scale of organization--i.e., as to whether they are local or extended--and behavior may be controlled sometimes by short-term relations and sometimes by long-term relations. Applied to choice, the molar paradigm rests on two simple principles: (a) all behavior constitutes choice; and (b) all activities take time. Equivalence between choice and behavior occurs because every situation contains more than one alternative activity. The principle that behavior takes time refers not simply to any notion of response duration, but to the necessity that identifying one action or another requires a sample extended in time. The molecular paradigm's momentary responses are inferred from extended samples in retrospect. In this sense, momentary responses constitute abstractions, whereas extended activities constitute concrete particulars. Explanations conceived within the molecular paradigm invariably involve hypothetical constructs, because they require causes to be contiguous with responses. Explanations conceived within the molar paradigm retain direct contact with observable variables. PMID:15157981

Baum, William M

2004-06-30

 
 
 
 
101

Inferior vena cava syndrome and morbid obesity.  

Science.gov (United States)

A case is reported of inferior vena cava syndrome in a patient with extreme obesity (BMI: >70 kg/m(2)), treated at a public hospital. The inferior vena cava obstruction was diagnosed during an attempt at inferior vena cava filter percutaneous insertion, in prebariatric surgery period. The diagnosis occurred after a hepatic scintillography, and was confirmed with a femoral venography and celiac trunk arteriography. The patient underwent a biliopancreatic diversion-duodenal switch and has lost weight. A venography 7 months after the surgery did not show any inferior vena cava rechanneling evidence. PMID:18574647

Meinhardt, Nelson Guardiola; Souto, Kátia Elisabete Pires; Knebel, Alexis Vasiluk; Stein, Airton Tetelbom

2008-12-01

102

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

103

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 SciELO Brazil | Language: English Abstract in portuguese 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

104

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 ...

105

Pulpotomías de molares temporales en pulpas muertas con tintura de propóleos al 10% / Pulpotomies of dead pulps in temporal molars using 10% propolis tinction.  

Scientific Electronic Library Online (English)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish Se realizó un ensayo clínico fase II aleatorizado comparado en 50 niños de 4 a 10 años que presentaron molares temporales con muerte pulpar, los cuales acudieron a la Clínica Estomatológica Provincial de Santiago de Cuba entre septiembre del 2005 y septiembre del 2006, con el objetivo de demostrar l [...] a eficacia de la tintura de propóleos al 10 % en pulpotomías (necropulpotomías). Se conformaron 2 grupos de tratamientos de 26 pacientes cada uno: en el grupo A se empleó tintura de propóleos al 10 % y en el B el formocresol. Los pacientes se evaluaron a los 7, 15 y 30 días, sin observarse diferencias ni reacciones adversas. El grupo dentario más tratado fue el constituido por los segundos molares temporales inferiores, donde la tintura de propóleos al 10 % en las pulpotomías, resultó ser tan eficaz como el formocresol, por lo que se recomienda incluir en tratamientos endodónticos esta nueva terapéutica. Abstract in english A comparative phase II randomized clinical assay of 50 children aged 4 to 10 years, who presented with temporal molars with dead pulp and were seen at the Provincial Dental Clinic of Santiago de Cuba from September 2005 to September 2006, was conducted to confirm the effectiveness of 10% propolis ti [...] nction in pulpotomies (necropulpotomies). Two groups of 26 patients were formed; group A used 10% propolis tinction and group B was treated with formocresol. The patients were evaluated at 7th , 15th and 30th days; neither difference nor adverse reaction was observed. The most treated dental group was the second lower temporal molars where 10% propolis tinction in pulpotomies proved to be as effective as formocresol, so it was recommended to include this new therapy in the endodontic treatment.

Walkyria del Carmen, González Rodríguez; Marcia Hortensia, Corona Carpio; Mayra Raquel, Martínez Ramos; Marylena, García Milanés; Leonardo, Núñez Antúnez.

2007-09-01

106

Forced extrusion for removal of impacted third molars close to the mandibular canal Extrusión forzada para extraer los terceros molares impactados cerca del canal mandibular  

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Full Text Available Impacted mandibular third molars can be located in close proximity to the mandibular canal. This creates a risk for the nerve or artery injury. These are contained in the canal. However, the impacted third molar can be moved coronally by orthodontic means, after removal of overlying bone, and safely extracted. The orthodontic intervention slowly moves the tooth apex away from the mandibular canal and reduces the potential for a neural injury. This method may be useful for older patients with root apices that approximate or are actually located in the mandibular canal. This technique needs further study. There is a theoretical potential for neural or arterial injury from physical contact of the tooth apex as it moves by or through the mandibular canal.Los terceros molares inferiores impactados pueden localizarse muy cerca del canal mandibular. Esto constituye un riesgo de lesión del nervio o la arteria, que se localizan dentro del canal. No obstante, el tercer molar impactado puede desplazarse en dirección coronal con ortodoncia, tras ostectomía del hueso suprayacente, y extraerse sin riesgos. La intervención ortodóncica desplaza lentamente el ápice del diente fuera del canal mandibular y reduce la posibilidad de lesión neural. Este método puede ser útil para pacientes de edad avanzada con ápices dentales que se aproximan o en realidad se localizan en el canal mandibular. La técnica necesita un estudio adicional. Hay la posibilidad teórica de lesión neural o arterial a partir del contacto físico del ápice del diente a medida que se desplaza a través del canal mandibular.

Dennis Flanagan DDS

2012-03-01

107

Forced extrusion for removal of impacted third molars close to the mandibular canal / Extrusión forzada para extraer los terceros molares impactados cerca del canal mandibular  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: English Abstract in spanish Los terceros molares inferiores impactados pueden localizarse muy cerca del canal mandibular. Esto constituye un riesgo de lesión del nervio o la arteria, que se localizan dentro del canal. No obstante, el tercer molar impactado puede desplazarse en dirección coronal con ortodoncia, tras ostectomía [...] del hueso suprayacente, y extraerse sin riesgos. La intervención ortodóncica desplaza lentamente el ápice del diente fuera del canal mandibular y reduce la posibilidad de lesión neural. Este método puede ser útil para pacientes de edad avanzada con ápices dentales que se aproximan o en realidad se localizan en el canal mandibular. La técnica necesita un estudio adicional. Hay la posibilidad teórica de lesión neural o arterial a partir del contacto físico del ápice del diente a medida que se desplaza a través del canal mandibular. Abstract in english Impacted mandibular third molars can be located in close proximity to the mandibular canal. This creates a risk for the nerve or artery injury. These are contained in the canal. However, the impacted third molar can be moved coronally by orthodontic means, after removal of overlying bone, and safely [...] extracted. The orthodontic intervention slowly moves the tooth apex away from the mandibular canal and reduces the potential for a neural injury. This method may be useful for older patients with root apices that approximate or are actually located in the mandibular canal. This technique needs further study. There is a theoretical potential for neural or arterial injury from physical contact of the tooth apex as it moves by or through the mandibular canal.

Dennis, Flanagan DDS.

2012-03-01

108

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

109

Anesthetic efficacy of a repeated intraosseous injection given 30 min following an inferior alveolar nerve block/intraosseous injection.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

To determine whether a repeated intraosseous (IO) injection would increase or prolong pulpal anesthesia, we measured the degree of anesthesia obtained by a repeated IO injection given 30 min following a combination inferior alveolar nerve block/intraosseous injection (IAN/IO) in mandibular second premolars and in first and second molars. Using a repeated-measures design, we randomly assigned 38 subjects to receive two combinations of injections at two separate appointments. The combinations w...

Reitz, J.; Reader, A.; Nist, R.; Beck, M.; Meyers, W. J.

1998-01-01

110

Molar volume of solid isotopic helium mixtures  

International Nuclear Information System (INIS)

Solid isotopic helium mixtures have been studied by path-integral Monte Carlo simulations in the isothermal-isobaric ensemble. This method allowed us to study the molar volume as a function of temperature, pressure, and isotopic composition. At 25 K and 0.2 GPa, the relative difference between molar volumes of isotopically pure crystals of 3He and 4He is found to be about 3%. This difference decreases under pressure, and for 12 GPa it is smaller than 1%. For isotopically mixed crystals, a linear relation between lattice parameters and concentrations of helium isotopes is found, in agreement with Vegard's law. The virtual crystal approximation, valid for isotopic mixtures of heavier atoms, does not give reliable results for solid solutions of helium isotopes

111

Dens in dente of maxillary third molar  

Directory of Open Access Journals (Sweden)

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

112

Can histopathologists reliably diagnose molar pregnancy?  

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AIMS--To assess the degree of difficulty in diagnosing partial mole by analysing intraobserver and interobserver agreement among a group of pathologists for these diagnoses. METHODS--Fifty mixed cases of partial mole, complete mole, and non-molar pregnancy were submitted to seven histopathologists, two of whom are expert gynaecological pathologists; the other five were district general hospital consultants, one of whom works in Australia. These participants gave each slide a firm diagnosis of...

Howat, A. J.; Beck, S.; Fox, H.; Harris, S. C.; Hill, A. S.; Nicholson, C. M.; Williams, R. A.

1993-01-01

113

Ectopic third molar in the maxillary sinus  

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Ectopic eruption of teeth into a region other than the oral cavity is rare although there have been reports of teeth in the nasal septum, mandibular condyle, coronoid process, palate, chin and maxillary sinus. Occasionally, a tooth may erupt in the maxillary sinus and present with local sinonasal symptoms attributed to chronic sinusitis. We present a case of an ectopic maxillary third molar tooth that caused chronic purulent sinusitis in relation to the right maxillary sinus.

Mohan, Shishir; Kankariya, Hasti; Harjani, Bhupendra; Sharma, Harendra

2011-01-01

114

Iatrogenic injury to the inferior alveolar nerve : etiology, signs and symptoms, and observations on recovery  

DEFF Research Database (Denmark)

The purpose of this prospective, non-randomised, descriptive study is to characterise the neurosensory deficit and associated neurogenic discomfort in 52 patients with iatrogenic injury to the inferior alveolar nerve (IAN). All patients were examined and followed up according to a protocol assessing tactile, thermal, and positional perception as well as two-point discrimination and pain. In 48 patients with IAN injuries of differing etiologies who did not undergo surgery, 32 patients with injury associated with third molar surgery exhibited significant spontaneous improvement of sensory function. Recovery improvement of sensory function was insignificant in the patients with other etiologies. In most patients the level of sensory perception was such that microsurgical repair was only occasionally indicated. Four patients had microsurgical repair; the outcome was favourable in three. IAN injuries associated with third molar surgery, other dento-alveolar surgery or implant surgery occur sufficiently often to render prevention a key issue.

Hillerup, SØren

2008-01-01

115

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

116

[The research of orthodontic therapy in second molar overjet  

Science.gov (United States)

The malocclusion of overjet of second molars is very frequent,When the 2183 patients were examined,we found that the above-mentioned malocclusion had 420 cases.It accounts for 19.22%.The factors led this malocclusion are many.The cases of buccoversion of second molar in maxilla and normal of this tooth in mandible are 257.That upper second molar is buccoversion and lower second molar is linguoversion.all in one side,are 104 cases.Upper normal and lower linguoversion are 24.Buccoversion of two second molars only in upper dental arch and lingual position of second molar in one side of lower dental arch are 31.Even that bilateral lower second molars are linguoversion and this tooth of upper jaw in one side is buccoversion are 4.Therefore,we must adopt various technique according to malposition condition of second molar.This paper will describe five corrective. PMID:15159895

Lin, Z; Xu, R S; Li, K F; Ke, J; Wang, H D

1992-12-01

117

Efficacy of low level laser therapy on neurosensory recovery after injury to the inferior alveolar nerve  

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Full Text Available Abstract Background The most severe complication after the removal of mandibular third molars is injury to the inferior alveolar nerve or the lingual nerve. These complications are rather uncommon (0.4% to 8.4% and most of them are transient. However, some of them persist for longer than 6 months, which can leave various degrees of long-term permanent disability. While several methods such as pharmacologic therapy, microneurosurgery, autogenous and alloplastic grafting can be used for the treatment of long-standing sensory aberrations in the inferior alveolar nerve, there are few reports regarding low level laser treatment. This paper reports the effects of low level laser therapy in 4 patients with longstanding sensory nerve impairment following mandibular third molar surgery. Methods Four female patients had complaints of paresthesia and dysesthesia of the lip, chin and gingiva, and buccal regions. Each patient had undergone mandibular third molar surgery at least 1 year before. All patients were treated with low level laser therapy. Clinical neurosensory tests (the brush stroke directional discrimination test, 2-point discrimination test, and a subjective assessment of neurosensory function using a visual analog scale were used before and after treatment, and the responses were plotted over time. Results When the neurosensory assessment scores after treatment with LLL therapy were compared with the baseline values prior to treatment, there was a significant acceleration in the time course, as well as in the magnitude, of neurosensory return. The VAS analysis revealed progressive improvement over time. Conclusion Low level laser therapy seemed to be conducive to the reduction of long-standing sensory nerve impairment following third molar surgery. Further studies are worthwhile regarding the clinical application of this treatment modality.

Gorur Ilker

2006-02-01

118

First permanent maxillary molar morphology and ideal occlusion.  

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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 ...

Halazonetis, D. I.

2000-01-01

119

Breast Reconstruction: Deep Inferior Epigastric Perforator  

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

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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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 ...

 
 
 
 
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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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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 ...

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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Full Text Available ... blood supply, which is the deep inferior epigastric artery and vein, comes up from underneath the muscle ... re not always as reliable, and particularly the artery is not always present, or if present, may ...

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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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 ...

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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Full Text Available ... The deep inferior epigastric perforator flap technique allows surgeons to rebuild breasts in the most natural way ... m Dr. William Samson. I'm a plastic surgeon, and I'll be your moderator for today's ...

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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Full Text Available ... tough decisions these and other women made after learning they had breast cancer. You will also see the breast reconstruction surgery each of them chose to undergo. The deep inferior epigastric perforator flap technique allows surgeons to ...

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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Full Text Available ... DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00:00:24 ... MD, FACS: This is called a microvascular coupling device. It's used by us to reconnect the vein. ...

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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Full Text Available BREAST RECONSTRUCTION: DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00: ... 51:00 MARK L. SMITH, MD, FACS: The final clamp is the one on the artery feeding ...

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

Science.gov (United States)

BREAST RECONSTRUCTION: DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00:00: ... had breast cancer. You will also see the breast reconstruction surgery each of them chose to undergo. The ...

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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Full Text Available BREAST RECONSTRUCTION: DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00:00: ... had breast cancer. You will also see the breast reconstruction surgery each of them chose to undergo. The ...

130

Breast Reconstruction: Deep Inferior Epigastric Perforator  

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Full Text Available ... chose to undergo. The deep inferior epigastric perforator flap technique allows surgeons to rebuild breasts in the ... natural way possible. Unlike older techniques, the deep flap doesn't require the removal of abdominal muscle. ...

131

Breast Reconstruction: Deep Inferior Epigastric Perforator  

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Full Text Available ... to undergo. The deep inferior epigastric perforator flap technique allows surgeons to rebuild breasts in the most natural way possible. Unlike older techniques, the deep flap doesn't require the removal ...

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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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. ...

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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Full Text Available ... DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00:00:24 ... my preference is just to do it the old-fashioned way, which is to sew it. So ...

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Breast Reconstruction: Deep Inferior Epigastric Perforator  

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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 ...

135

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

136

Pérdida del primer molar permanente en niños de 7 a 13 años / Loss of the first permanent molar tooth in children from 7 to 13 years  

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Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish Fundamento: La caries dental es una enfermedad crónica, infecciosa, transmisible y multifactorial; prevalece en la infancia y constituye la causa fundamental de la pérdida dental. Objetivo: Determinar la pérdida del primer molar permanente en niños de 7 a 13 años. Método: Se realizó un estudio obser [...] vacional, descriptivo, longitudinal y prospectivo en 63 niños de 7 a 13 años pertenecientes al sector 1 de la urbanización «Las Margaritas», municipio Carirubana, estado Falcón, desde septiembre de 2005 a mayo de 2006. Las variables estudiadas fueron: edad, sexo, daño causado a las estructuras bucales e higiene bucal del niño. Resultados: Del total de pacientes, 16 corresponden al sexo masculino, lo que representó el 57,4 % de la muestra y 12 pacientes al femenino para un 42,6 %. En relación a la edad se obtuvo un mayor número de pacientes en las edades de 10-11 años con un total de seis niños (21,4%). El diente con mayor índice de ausencia fue el primer molar inferior derecho con un total de 16 para el 37,2. De las afecciones bucales más comunes provocadas por la pérdida del primer molar permanente, se encontró que 17 niños presentaron extrusión del antagonista y 13 masticación unilateral. Al analizar la higiene en los niños estudiados se observó que solo en 11 pacientes (39,2%) fue aceptable y en el 60,8 % (17 de los pacientes) fueron evaluados de no aceptable. Conclusiones: El sexo masculino fue el más afectado por la pérdida del primer molar permanente y la higiene bucal en su mayoría fue no aceptable. Abstract in english Background: Dental caries is a transmissible, infectious, chronic and multifactorial disease; prevails in the infancy and constitutes the fundamental cause of the dental loss. Objective: To determine the loss of the first permanent molar tooth in children from 7 to 13 years. Method: An observational [...] , descriptive, longitudinal and prospective study was conducted in 63 children from 7 to 13 years belonging to the sector 1 of the urbanization «Las Margaritas», Carirubana municipality, Falcón state, from September 2005 to May 2006. The studied variables were: age, sex, damage caused to the oral structures and oral hygiene of the boy. Results: Of the total of patients, 16 correspond to the male sex, what represented the 57.4% of the sample and 12 patients to the female one for a 42.6%. Relating to the age a greater number of patients between 10-11 years with a total of six children was obtained (21,4%). The tooth with greater index of absence was the first right lower molar with a total of 16 for the 37.2%. Of the most common oral affections caused by the loss of the first permanent molar tooth, was found that 17 children presented extrusion of the antagonist and 13 unilateral mastication. On analyzing the hygiene in the studied children was observed that just in 11 patients (39,2%) was acceptable and in the 60.8% (17 of the patients) were evaluated as no acceptable. Conclusions: The male sex was the most affected one by the loss of the first permanent molar tooth and mostly oral hygiene was no acceptable.

Deinys, Pupo Arias; Xiomara Bárbara, Batista Zaldívar; Isidro de Jesús, Nápoles González; Oscar, Rivero Pérez.

2008-10-01

137

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  

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Full Text Available SciELO Venezuela | Language: Spanish Abstract in spanish 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

138

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%.

139

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

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Full Text Available SciELO Brazil | Language: English Abstract in english 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

140

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

 
 
 
 
141

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  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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. Abstract in english 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.

Juliana Maria, Quaglio; Marcela Bernardes, Sousa; Thiago Machado, Ardenghi; Fausto Medeiros, Mendes; José Carlos Pettorossi, Imparato; Sérgio Luiz, Pinheiro.

2006-12-01

142

ANOMALOUS ORIGIN OF RIGHT INFERIOR PHRENIC ARTERY  

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Full Text Available Background: To show the anomalous origin of right inferior phrenic artery from right renal artery and to discuss the embryological basis and surgical significance of such variation. Method: This was found during routine dissection of abdomen in a 61 year old adult male cadaver in the department of anatomy, R.G.Kar Medical College. Results: It was seen that right inferior phrenic artery(RIPA took its origin from right renal artery. Further distribution of RIPA was normal. Left inferior phrenic artery (LIPA arose normally from abdominal aorta. Conclusion: Accurate knowledge regarding this is important for carrying out vascular and reconstructive surgery and for evaluation of angiographic images . The RIPA is a major source of collateral arterial supply to hepatocellular carcinoma, second only to the hepatic artery. So a surgically inoperable HCC can be treated by transcatheter embolization of not only the right or left hepatic arteries, but also by embolization of a RIPA, if involved.

Banani Kundu

2014-06-01

143

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

144

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

145

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

146

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

147

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 SciELO Cuba | Language: Spanish Abstract in spanish 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

148

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)

149

Molar viscosity of molten mixtures of lithium and thorium fluorides  

International Nuclear Information System (INIS)

The method of damped torsional oscillations of a cylindrical crucible, filled with melt has been used to study the temperature dependence of kinematic viscosity of molten mixtures of lithium and thorium fluorides (910-1481 K). The coefficients of dynamic viscosity, as well as molar viscosity of the investigated melts, are calculated. The equation of isotherm of the molar viscosity of the ideal mixture is proposed in supposition on additive change of the molar free activation energy of viscous flow by composition. A relative derivations of the molar viscosity from the ideal are calculated

150

[Traumatic rupture of the inferior thyroid artery].  

Science.gov (United States)

We report a rare case of traumatic aneurysma of the inferior thyroid artery, which occurred after a minor life-threatening trauma. The lesion was diagnosed during an angiographical examination, performed because of hemodynamic instability of the patient. For therapy, the lesion was ligated and excised. PMID:8737585

Siegmeth, A; Gäbler, C; Sandbach, G; Vécsei, V

1996-05-01

151

Inferior vena cava aneurysm. A case report  

International Nuclear Information System (INIS)

Aneurysmal dilatation of the inferior vena cava can occur in patients with heart disease or, very likely, with congenital weakness of the vascular wall. Chest x-ray discloses a mass in right cardiophrenic angle. The diagnosis can be confirmed by ultrasound, more invasive measures being unnecessary. (Author) 6 refs

152

A case of inferior lumbar hernia  

Directory of Open Access Journals (Sweden)

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

153

Multiplanar imaging of inferior vena cava variants.  

Science.gov (United States)

Inferior vena cava (IVC) variants are rare and are usually detected incidentally. Even though, these variants are by themselves asymptomatic, they can have important clinical, radiological, and surgical implications. In this pictorial essay, we sensitize the reader to various IVC variants by presenting reports of actual patients. A succinct description of the embryological development of these anatomic variants is also provided. PMID:24981147

Awais, Muhammad; Rehman, Abdul; Baloch, Noor Ul-Ain; Salam, Basit

2015-01-01

154

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.

155

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

156

Presence of third molars in orthodontic patients from northern Greece  

Directory of Open Access Journals (Sweden)

Full Text Available Georgia Barka,1 Georgios Tretiakov,1 Theodosios Theodosiou,2 Ioulia Ioannidou-Marathiotou31School of Dentistry, 2Biostatistics, Department of Informatics, School of Natural Sciences, 3Department of Orthodontics, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, GreeceObjective: The purpose of the present study was to investigate the frequency of presence of third molar teeth and their distribution in each jaw and each side, according to sex, in a group of orthodontic patients with permanent dentition from northern Greece.Methods: The sample included panoramic radiographs from 220 patients with permanent dentition (mean age 13.62 ± 1.81. The ?2 test was used to assess the relationships between the variables, and the Fisher's exact test was used in cases where the expected frequencies in each cell were <5.Results: The frequency of third molar presence was 79.1%, and 20.9% was the frequency of third molar agenesis. Intersexual differences in the number of third molars was not statistically significant. There was a correlation between the distribution of third molars on the right and the left side (Fisher's exact test = 100.788; P = 0. The two sides showed the same tendency toward the presence or absence of third molars. A correlation was also found between the distribution of maxillary and mandibular third molars (Fisher's exact test = 24.372; P = 0. In each jaw, the presence or absence of third molars was highly related to the number of third molars found in the other jaw.Conclusion: The present results showed that in this orthodontic group of northern Greek patients, presence accounted for 79.1% and agenesis for 20.9%. No significant difference was found between the frequencies of third molar presence on the left and right sides in either the maxilla or mandible.Keywords: third molars, presence, orthodontic population, Greeks

Barka G

2012-05-01

157

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese 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

158

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  

Scientific Electronic Library Online (English)

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

159

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

160

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

 
 
 
 
161

Treatment options for hypomineralized first permanent molars and incisors  

Directory of Open Access Journals (Sweden)

Full Text Available The aim of this study was to discuss therapy possibilities in the management of molar incisor hypomineralization. Molar incisor hypomineralization (MIH is defined as hypomineralization of one or more first permanent molars frequently affecting incisors. Etiology of MIH is not fully clarified and numerous etiological factors have been cited. Hypomineralized molars are more prone to caries, cause severe restorative problems and are frequently extracted due to serious damage and caries complications. Incisors can present demarcated enamel opacities, while enamel breakdown is uncommon. Clinically, affected molars can be sensitive to thermal and chemical irritations even when there is no enamel breakdown. Molars can be sensitive to mechanical irritations making even regular tooth brushing painful. Specific problems related to the treatment of these teeth are sensitivity and occlusion in molars and aesthetics in incisors. Considering the fact that permanent first molars with severe defects and incisors demand complex and multidisciplinary treatment they present serious problem for the patient as well as for the dentist.

Ivanovi? Mirjana

2006-01-01

162

The bihemispheric posterior inferior cerebellar artery  

Energy Technology Data Exchange (ETDEWEB)

Rarely, a solitary posterior inferior cerebellar artery (PICA) will supply both cerebellar hemispheres. We report four cases of this variant. We present a retrospective review of clinical information and imaging of patients undergoing angiography at our institution to identify patients with a bihemispheric PICA. There were four patients: three males and one female. One patient presented with a ruptured arteriovenous malformation, and one with a ruptured aneurysm. Two patients had normal angiograms. The bihemispheric PICA was an incidental finding in all cases. The bihemispheric vessel arose from the dominant left vertebral artery, and the contralateral posterior inferior cerebellar artery was absent or hypoplastic. In all cases, contralateral cerebellar supply arose from a continuation of the ipsilateral PICA distal to the choroidal point and which crossed the midline dorsal to the vermis. We conclude that the PICA may supply both cerebellar hemispheres. This rare anatomic variant should be considered when evaluating patients with posterior fossa neurovascular disease. (orig.)

Cullen, Sean P. [Brigham and Women' s Hospital and Children' s Hospital, Department of Radiology and Neurosurgery, Boston, MA (United States); Ozanne, Augustin; Alvarez, Hortensia; Lasjaunias, Pierre [Service de Neuroradiologie Diagnostic et Therapeutique, Hopital de Bicetre-Universite Paris-sud Orsay (France)

2005-11-01

163

The bihemispheric posterior inferior cerebellar artery  

International Nuclear Information System (INIS)

Rarely, a solitary posterior inferior cerebellar artery (PICA) will supply both cerebellar hemispheres. We report four cases of this variant. We present a retrospective review of clinical information and imaging of patients undergoing angiography at our institution to identify patients with a bihemispheric PICA. There were four patients: three males and one female. One patient presented with a ruptured arteriovenous malformation, and one with a ruptured aneurysm. Two patients had normal angiograms. The bihemispheric PICA was an incidental finding in all cases. The bihemispheric vessel arose from the dominant left vertebral artery, and the contralateral posterior inferior cerebellar artery was absent or hypoplastic. In all cases, contralateral cerebellar supply arose from a continuation of the ipsilateral PICA distal to the choroidal point and which crossed the midline dorsal to the vermis. We conclude that the PICA may supply both cerebellar hemispheres. This rare anatomic variant should be considered when evaluating patients with posterior fossa neurovascular disease. (orig.)

164

CT appearance of pneumatized inferior turbinate  

Energy Technology Data Exchange (ETDEWEB)

Aim: To study the computed tomography (CT) features of pneumatized inferior turbinate (PIT). Materials and methods: A retrospective review of paranasal sinus CT over a period of 12 years showed 16 cases of PIT. The pneumatization pattern was analysed according to the classification proposed by Bolger. Pneumatization was classified into three types: bulbous, lamellar, and extensive. Results: Fourteen patients had unilateral and two patients had bilateral pneumatization (n = 18). Seven (39%) of the 18 PIT were bulbous, nine (50%) were lamellar, and two (11%) were of the extensive type. In eight (44%) cases there was communication between the medial wall of the maxillary sinus and the PIT. Conclusions: The features of PIT can be readily identified on CT. Imaging helps clinicians to differentiate PIT from other causes of the inferior turbinate hypertrophy or complications.

Yang, B.T. [Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing (China); Chong, V.F.H. [Department of Diagnostic Radiology, National University Hospital and Yong Loo Lin School of Medicine, National University of Singapore (Singapore); Wang, Z.C. [Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing (China)], E-mail: cjr.yangbentao@vip.163.com; Xian, J.F.; Chen, Q.H. [Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing (China)

2008-08-15

165

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

166

Microvascular Organization of the Cat Inferior Colliculus  

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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

167

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

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Full Text Available SciELO Brazil | Language: 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

168

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

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Full Text Available 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 tratamentoLower 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 results 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

2010-12-01

169

Influence of inferior olive on flexor reflex activity.  

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In Wistar rats we have studied the effect of inferior olive lesion or activation on the threshold of a flexor reflex elicited by a nociceptive stimulus applied to the hindpaw. When the inferior olive is lesioned by means of 3-acetylpyridine, the threshold value is significantly decreased. A recovery occurs in 3-4 weeks. When the inferior olive is activated by means of harmaline, the threshold value is significantly increased. These experiments suggest the inferior olive activity exerts an inh...

Rocca, Paola; Strata, Pier Giorgio

1986-01-01

170

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

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Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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.

171

Cemental tear on a mandibular second molar: a case report.  

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A cemental tear is a special kind of root fracture that may cause rapid and localized periodontal destruction. Most cemental tears have been reported on bicuspids and incisors. Here we present a case of cemental tears on both the right mandibular first and second molars. The patient was a 72-year-old man who showed gingival swelling and a deep pocket over his right mandibular second molar as well as a deep periodontal pocket on the distolingual aspect of the first molar. During exploratory flap surgery, a detached root fragment on the mesial side of the second molar and a small root fragment on the lingual surface of the first molar were found and removed for biopsy. After histopathological examination, both root fragments were confirmed to be cemental tears. The periodontal defects were treated by osseous grafting and guided tissue regeneration. A postoperative probing depth of 4 mm on the second molar was recorded at 3 months and remained stable for 5 years. Where marked periapical and periodontal bony destruction are present, a cemental tear should be considered as a possible diagnosis, even in the molar teeth, for early treatment to improve prognosis. PMID:20652798

Lin, Hsueh-Jen; Chan, Chiu-Po; Wu, Chen-Tsai; Jeng, Jiiang-Huei

2010-07-01

172

Molar heat capacity and entropy of calcium metal  

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The heat capacity of calcium has been measured at 85 mean temperatures between T ??? 8 K and T ??? 369 K using an adiabatically-shielded calorimeter in an intermittent heating mode. At T = 298.15 K, the recommended values for the molar heat capacity, molar entropy, and molar enthalpy increment referred to T = 0 are (25.77 ?? 0.08) J??K-1??mol-1, (42.90 ?? 0.11) J??K-1??mol-1, and (5811 ?? 12) J??mol-1, respectively. The uncertainties are twice the standard deviation of the mean. ?? 1997 Academic Press Limited.

Hemingway, B.S.; Robie, R.A.; Chase, M.W.

1997-01-01

173

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

174

The leiomyosarcoma of the vena cava inferior  

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The leiomyosarcoma of the Vena cava inferior is a mesenchymal tumor originating from the smooth muscle fibers of the vascular wall. This tumor is usually slow-growing and of expansive growth. Prior to the sonographic and computer-tomographic era the tumor was usually only discovered during autopsy or surgery without any preoperative suspicion. Today, the most efficient imaging methods for exact localization, delineation or relation to the vascular lumen and local extent are sonography and computer tomography. Caudal cavography is called upon for preoperative demonstration of the venous collateral circulation and thrombotic vascular occlusion. (orig.)

175

Mandibular first molar with a radix entomolaris: an endodontic dilemma.  

Science.gov (United States)

It is known that the mandibular first molar can display significant anatomical variations namely the number of root canals, the number of roots and morphology. Mandibular molars may sometimes have an additional root located lingually (the radix entomolaris) or buccally (the radix paramolaris). If encountered, an awareness and understanding of this unusual root and its canal morphology can contribute to the successful outcome of root canal treatment. This case report discusses endodontic treatment of a mandibular first molar with a radix entomolaris, which is a rare entity and poses as an endodontic dilemma for the clinician with respect to diagnosis and subsequent treatment. Clinicians should be aware of these unusual root morphologies in the mandibular first molar which needs strategic treatment as unfilled canals remain a nidus for infection and can compromise treatment outcome. PMID:24910685

Sarangi, Priyanka; Uppin, Veerendra M

2014-01-01

176

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

177

Mandibular First Molar with a Radix Entomolaris: An Endodontic Dilemma  

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It is known that the mandibular first molar can display significant anatomical variations namely the number of root canals, the number of roots and morphology. Mandibular molars may sometimes have an additional root located lingually (the radix entomolaris) or buccally (the radix paramolaris). If encountered, an awareness and understanding of this unusual root and its canal morphology can contribute to the successful outcome of root canal treatment. This case report discusses endodontic treat...

Sarangi, Priyanka; Uppin, Veerendra M.

2014-01-01

178

Molar and molecular analysis: two visions of behavior  

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Full Text Available The confrontation between the molar and the molecular approach to the study of behavior has regainedimportance. Both viewpoints are contrasted in this article, indicating their common ground butemphasizing its discrepancies. These discrepancies are present in the conceptualization of behavior asevent, in the interpretation of behavioral data (illustrated with the study of avoidance behavior, and inthe comprehension of mental events (illustrated with the notion of pain. In all these instances, thetheoretical superiority of a molar over a molecular perspective is evident.

FEDERICO SANABRIA

2002-07-01

179

Diagnosis of complete molar pregnancy by microsatellites in archival material.  

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AIMS--To develop an assay which would determine the parentage of hydatidiform molar pregnancies. METHODS--DNA was extracted from formalin fixed, paraffin wax embedded tissue from hydatidiform molar pregnancies and spontaneous abortions after separation of chorionic villi and decidua. PCR amplification of dinucleotide repeat sequences ("microsatellites") was performed using three different primers. Products were radioactively labelled and visualised by autoradiography of dried polyacrylamide g...

Lane, S. A.; Taylor, G. R.; Ozols, B.; Quirke, P.

1993-01-01

180

3-D diagnosis-assisted management of anomalous mandibular molar  

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This case report describes the successful non-surgical endodontic management of carious exposed three-rooted mandibular molar with four root canals detected on the pre-operative radiograph taken with 20 degrees mesial angulation and confirmed with a 64-slice helical computed tomography scan-assisted 3-D-reconstructed images. Access cavity shape was modified to locate the extra canal with respect to the distolingual root in the left mandibular first molar. Copious irrigation was accomplished w...

Mittal, Neelam; Narang, Isha

2012-01-01

 
 
 
 
181

Restorasi Stainless Steel Crown Open Face Pada Gigi Molar Sulung  

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Dalam praktek sehari-hari sering kita mendapat kesulitan untuk menentukan restorasi yang tepat pada molar sulung dengan karies yang meliputi lebih dari dua permukaan gigi oleh karena amalgam dan bahan tambalan lain mengalami kegagalan. Stainless Steel Crown(SSC) dapat mengatasi masalah ini, tetapi karena warna logam dari ssc ini menyebabkan pasien kurang menyukainya. Restorasi SSC untuk gigi molar sulung dapat dikerjakan dalam waktu singkat dan prosedur kerjanya tidaklah sulit, karena telah t...

Zarniati

2008-01-01

182

Influence of molar ratios on properties of magnesium oxychloride cement  

International Nuclear Information System (INIS)

A parametric study has been conducted to investigate the influences of the molar ratios of MgO/MgCl2 and H2O/MgCl2 on the properties of magnesium oxychloride (MOC) cement. By an integrated assessment of the experimental studies of strength development and X-ray diffractograms, together with application of the relevant phase diagram, it is recognized that the molar ratios of MgO/MgCl2 and H2O/MgCl2 can significantly affect the properties of MOC cement. For a MOC cement paste possessing a dominance of 5MgO.MgCl2.8H2O (phase 5) crystals, the molar ratios of MgO/MgCl2 of 11-17 and H2O/MgCl2 of 12-18 are found to be the most favorite ranges for design purpose. The choose of the molar ratio of H2O/MgCl2 is, however, largely depends on the molar ratio of MgO/MgCl2 mainly for controlling workability of paste. Therefore, the most critical parameter to be selected in the design process is the molar ratio of MgO/MgCl2, although the reactivity of the MgO powder is also important. Besides, the molar ratio can also be affected by the reactivity of the MgO powder to be employed. It is believed that a molar ratio of MgO/MgCl2 of 13, the most suitable one shown in this study, can be used as a starting point in the normal practice

183

Standard molar enthalpies of formation of some vinylfuran derivatives  

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The standard (p{sup 0} = 0.1 MPa) molar enthalpies of combustion, {delta}{sub c}H{sub m}{sup 0}, for crystalline 2-furanacrylic acid, 3-furanacrylic acid, and 3-(2-furyl)-2-propenal and for the liquid 2-furanacrylonitrile were determined, at the temperature 298.15 K, using a static bomb combustion calorimeter. For these compounds, the standard molar enthalpies of phase transition, {delta}{sub cr,l}{sup g}H{sub m}{sup 0}, at T = 298.15 K, were determined by Calvet microcalorimetry. For the two crystalline furanacrylic acids the vapour pressures as function of temperature were measured by the Knudsen effusion technique and the standard molar enthalpies of sublimation, {delta}{sub cr}{sup g}H{sub m}{sup 0}, at T = 298.15 K were derived by the Clausius-Clapeyron equation. The results are presented in a table. These values were used to derive the standard molar enthalpies of formation of the compounds in their condensed and gaseous phases, respectively. For 2-furanacrylic acid and 3-furanacrylic acid, the standard (p{sup 0} = 0.1 MPa) molar enthalpies, entropies, and Gibbs functions of sublimation, at T = 298.15 K, were derived. The derived standard molar enthalpies of formation in the gaseous state are analysed in terms of structural enthalpic increments.

Ribeiro da Silva, Manuel A.V. [Centro de Investigacao em Quimica, Department of Chemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto (Portugal)], E-mail: risilva@fc.up.pt; Amaral, Luisa M.P.F. [Centro de Investigacao em Quimica, Department of Chemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto (Portugal)

2009-03-15

184

Standard molar enthalpies of formation of some vinylfuran derivatives  

International Nuclear Information System (INIS)

The standard (p0 = 0.1 MPa) molar enthalpies of combustion, ?cHm0, for crystalline 2-furanacrylic acid, 3-furanacrylic acid, and 3-(2-furyl)-2-propenal and for the liquid 2-furanacrylonitrile were determined, at the temperature 298.15 K, using a static bomb combustion calorimeter. For these compounds, the standard molar enthalpies of phase transition, ?cr,lgHm0, at T = 298.15 K, were determined by Calvet microcalorimetry. For the two crystalline furanacrylic acids the vapour pressures as function of temperature were measured by the Knudsen effusion technique and the standard molar enthalpies of sublimation, ?crgHm0, at T = 298.15 K were derived by the Clausius-Clapeyron equation. The results are presented in a table. These values were used to derive the standard molar enthalpies of formation of the compounds in their condensed and gaseous phases, respectively. For 2-furanacrylic acid and 3-furanacrylic acid, the standard (p0 = 0.1 MPa) molar enthalpies, entropies, and Gibbs functions of sublimation, at T = 298.15 K, were derived. The derived standard molar enthalpies of formation in the gaseous state are analysed in terms of structural enthalpic increments

185

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

186

Bonded molar tubes: a retrospective evaluation of clinical performance.  

Science.gov (United States)

This study investigated time to first failure of stainless steel orthodontic first permanent molar tubes (Ormco Corp) bonded with a light-cured resin adhesive (Transbond) and assessed whether this was related to patient gender, age of the patient at the start of treatment, the presenting malocclusion, or the operator. All first molar tubes were bonded to intact buccal enamel, free of any restoration. Survival analysis was carried out on data from 483 patients with 1190 bonded first molar tubes. For each case, a single molar tube, either that which was first to fail or had the shortest follow-up time, was chosen for analysis. The median time until first bonded tube failure was 699 days with an overall failure rate of 21% recorded. There was no significant difference in time to first failure of molar tubes with respect to patient gender or presenting malocclusion but significant differences were recorded with respect to the patients' age at the start of treatment and the operator. Age at the start of treatment and operator were identified as independently useful predictors of bonded molar tube survival. PMID:10358250

Millett, D T; Hallgren, A; Fornell, A C; Robertson, M

1999-06-01

187

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.)

188

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

189

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

190

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.

191

Pattern of third molar impaction in a Saudi population  

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Full Text Available Ali H Hassan11Department of Preventive Dental Sciences, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi ArabiaObjective: To evaluate the current pattern of third molar impaction in a sample of Saudi patients.Methods: One thousand thirty-nine orthopantomograms (OPG of patients ranging in age from 19 to 46 years (536 males and 503 females were evaluated to determine the frequency of impacted third molars, their levels of eruption, and their angulations.Results: Four hundred twenty-two (40.5% of the 1039 OPG showed at least one impacted third molar, with no significant difference between males (222; 52.6% and females (200; 47.4% (P = 0.284. The most common number of impacted third molars per OPG was one (72.5%. Impacted third molars were 1.64 times more likely to occur in the mandible than in the maxilla. The most common angulation of impaction in the mandible was the mesial (33.4%, while the most common angulation in the maxilla, was the vertical (49.6%. Level B impaction was the most common in both maxilla (48.2% and mandible (67.7%. There was no significant difference in the frequency of impaction between the right and left sides in both jaws.Conclusion: The pattern of third molar impaction in the western region of Saudi Arabia is characterized by a high prevalence of impaction that is greater in the mandibles and with no sex predilection.Keywords: third molar, impaction, prevalence, Saudi 

Ali H Hassan

2010-10-01

192

Moraxella Catarrhalis en tracto respiratorio inferior  

Scientific Electronic Library Online (English)

Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish Se analizaron 1598 muestras de tracto respiratorio inferior de pacientes admitidos en el Hospital San Juan de Dios, San José, Costa Rica de noviembre de 1996 a agosto de 1997 y se determinó una frecuencia de aislamiento de Moraxella catarrhalis de 4,3%. Los pacientes con enfermedad pulmonar obstruct [...] iva crónica (EPOC), tuvieron mayor riesgo de presentar la bacteria Moraxella catarrhalis (p Abstract in english Among 1598 lower respiratory tract samples corresponding to patients admitted at the San Juan de Dios Hospital, San José, Costa Rica, between november 1996 and august 1997 (The frecuency of isolation of Moraxella catarrhalis) was 4,3%. Patients with Chronic Obstrutive Pulmonary Disease (copd) had a [...] higher risk of presenting Moraxella catarrhalis (p

Minor, Mora Mora.

1998-12-01

193

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.

194

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

195

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 | Language: 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

196

Iatrogenic displacement of impacted third molar. Case report  

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Full Text Available Peri-operative complications may occur during the surgical extraction of impacted mandibular third molars such as the iatrogenic displacement of the whole tooth or a tooth fragment in to the adjacent anatomical structures. The purpose of this case report is to present the diagnosis and treatment planning, as well as the surgical management required for the removal of a 3rd molar displaced in the soft tissues of the floor of the mouth. A 38-year old male patient presented to the Dental School, complaining of pain around the left submandibular area that started three months after the extraction of the impacted mandibular left third molar. At the radiographic examination the tooth was detected in the soft tissues of the floor of the mouth and in close proximity to the lingual plate. It is noteworthy that the patient was under the assumption that the tooth had been extracted successfully. Radiographically the tooth appeared at an 180° turnaround from its original position. Surgical extraction of the displaced third molar took place under local anaesthesia. No post-operative complications were reported. Thorough clinical and radiographic examination, as well as competency at surgical procedures are prerequisites for the appropriate surgical management of impacted third molars.

Konstantinos TSIKLAKIS

2013-08-01

197

Mandibular first molar with six root canals: a rare entity.  

Science.gov (United States)

Recently, there has been an ongoing trend of case reports that highlight the presence of more than four root canals in mandibular first molars. This tendency warns clinicians to be more prudent when dealing with mandibular first molars requiring endodontic treatment. Moreover, radiographic examination should be taken as a clue providing tool rather than as an absolute guide to anatomy and its associated aberrances. This case reports the successful non-surgical endodontic management of a mandibular first molar with six root canal systems with three canals in the mesial root and three in the distal root. The classification of root canal systems found in this case was Sert and Bayirli type XV in both the roots. After non-surgical endodontic treatment, the tooth was restored definitively with a resin composite core followed by porcelain fused to the metal crown. This case adds to the library of previously reported cases of mandibular first molars with six root canals and further emphasises on the importance of rare morphological deviations that may occur in the mandibular first molars. PMID:25082869

Hasan, Muhammad; Rahman, Munawar; Saad, Najeeb

2014-01-01

198

Thiomers: influence of molar mass on in situ gelling properties.  

Science.gov (United States)

The aim of this study was to investigate the influence of molar mass of thiolated polymers (thiomers) on their in situ gelling properties. Chitosan-thioglycolic acid (chitosan-TGA) and pectin-cysteine (pectin-Cys) of increasing molar mass were chosen to produce in situ gels in combination with carbamide peroxide. Low molar mass chitosan (~2 kDa) was prepared by oxidative degradation with NaNO(2), whereas pectin was depolymerized by heat treatment. Thiomers, displaying 1271-1616 ?mol (chitosan-TGA) and 305-403 ?mol (pectin-Cys) free thiol groups per gram polymer, were synthesized via amide bond formation mediated by a carbodiimide. The results showed that a reduction of molar mass combined with increased concentrations of both cationic chitosan-TGA and anionic pectin-Cys leads to higher final viscosities and to a higher relative increase in viscosity within 60 min and 180 min, respectively. Using this method, the dynamic viscosity of a very low molar mass chitosan-TGA (~2 kDa) could be increased 100,000-fold within 60 min and 390,000-fold within 180 min. In view of these in situ gelling properties carbohydrate thiomers might be useful for various pharmaceutical applications such as vehicle for drug delivery or as wound dressing material. PMID:22683454

Hintzen, Fabian; Laffleur, Flavia; Sarti, Federica; Shahnaz, Gul; Bernkop-Schnürch, Andreas

2012-10-15

199

Quality of analgesia after lower third molar surgery: A randomised, double-blind study of levobupivacaine, bupivacaine and lidocaine with epinephrine  

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Full Text Available Background/Aim. Surgical extraction of lower third molars is followed by mild or severe postoperative pain which peaks at maximal intensity in the first 12 hours and has a significant impact on a patient’s postoperative quality of life. The use of long-acting local anaesthetics is a promising strategy to improve postoperative analgesia. The aim of the present study was to investigate analgesic parameters and patient satisfaction after using 0.5% levobupivacaine (Lbup, 0.5% bupivacaine (Bup and 2% lidocaine with epinephrine 1:80,000 (Lid + Epi for an inferior alveolar nerve block following lower third molar surgery. Methods. A total of 102 patients (ASA I were divided into three groups, each of which received either 3 mL of Lbup, Bup or Lid + Epi. The intensity of postoperative analgesia was measured using a verbal rating scale (VRS. The total amounts of rescue analgesics were recorded on the first and during seven postoperative days. Patients satisfaction was noted using a modified verbal scales. Results. A significantly higher level of postoperative pain was recorded in Lid + Epi group compared to Bup and Lbup groups. No significant differences were seen between Bup and Lbup, but a significant reduction in the need for rescue analgesics was seen postoperatively in both Lbup and Bup (50% in comparison with Lid + Epi (80% in the first 24 hours. The same significant trend in rescue analgesic consumption was recorded for seven postoperative days. Patients’ overall satisfaction was significantly lower for Lid + Epi (10% than for Lbup (56% and Bup (52%. Conclusion. The use of a new and long-acting local anaesthetic 0.5% levobupivacaine is clinically relevant and effective for an inferior alveolar nerve block and postoperative pain control after third molar surgery. In our study Lbup and Bup controled postoperative pain more efficiently after lower third molar surgery compared to Lid + Epi. [Projekat Ministarstva nauke Republike Srbije, br. 175021

Brajkovi? Denis

2015-01-01

200

Standard molar enthalpies of formation of monochloroacetophenone isomers  

International Nuclear Information System (INIS)

The standard (p0=0.1MPa) molar enthalpies of formation of the liquids 2'-, 3'-, and 4'-chloroacetophenones were derived from the standard molar energies of combustion, in oxygen, to yield CO2(g) and HCl . 600H2O(l), at T = 298.15 K, measured by rotating-bomb combustion calorimetry. The Calvet microcalorimetry was used to measure the enthalpies of vaporization of the three compounds. These two thermodynamic parameters yielded the standard molar enthalpies of formation of the chloroacetophenone isomers, in the gaseous phase, at T = 298.15 K. (table) An empirical scheme, developed by Cox, was used to estimate the gas-phase enthalpies of formation and the obtained values were compared with the experimental ones.

 
 
 
 
201

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

202

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 SciELO Brazil | Language: Portuguese Abstract in portuguese 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

203

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

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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 the 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 ...

Prakash Babu, B.

2011-01-01

204

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

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Full Text Available 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 the 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.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 por 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.

B. Prakash Babu

2011-03-01

205

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish 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

206

Estudios físico-químicos de miscelas de aceites vegetales XIV. Volumen molar, refracción molar y viscosidad de disoluciones de estearato de metilo en ciciohexano, hexano, tetracloroetileno o tricloroetileno  

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Full Text Available In the miscelies studied, molar volume and molar refraction values show linear dependence with the molar fraction of methyl stearate. Viscosity values fit Hildebrand's modified equation, where the "Vo" parameter is a linear function of the molar fraction of methyl stearate. Regarding with this three physico-chemical properties, the mixtures studied behave like ideal mixtures of two organic liquids without ionization.

En todas las miscelas estudiadas los valores del volumen molar y de la refracción molar presentan variaciones lineales en función de la fracción molar de estearato de metilo. Los valores de viscosidad de las miscelas estudiadas se ajustan a la ecuación de fluidez de Hildebrand modificada, siendo su parámetro "Vo" función lineal de la fracción molar de estearato de metilo. En relación con estas tres características, el comportamiento de las miscelas estudiadas no difiere significativamente del correspondiente a una mezcla "ideal" de dos líquidos orgánicos sin ionizar.

Muñoz Cueto, María J.

1991-02-01

207

Endodontic Management of a Maxillary Molar with Three Mesiobuccal Canals  

Science.gov (United States)

It is imperative that the clinician should have comprehensive knowledge about the normal anatomy and its variations of the teeth as the deviations from the usual are very common. An increased awareness of unusual anatomy and a better understanding of the root canal system guide the clinician in accurate diagnosis and treatment of such variations in order to achieve a successful endodontic outcome. The maxillary first molar has been shown to have a wide variation in respect to the number of canals specifically noted in the mesiobuccal root. The current case report shows the successful management of a maxillary molar in which the mesiobuccal root had three canals. PMID:25505997

Gundam, Sirisha; Maddu, Radhika; Gurram, Sindhura Reddy

2014-01-01

208

Dilated odontome in the mandibular third molar region.  

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The dilated odontome is the most severe form of the dens invaginatus (dens in dente), which is extremely rare in the mandible, especially in the molar region. A case is reported in a 28-year-old female with an unusual ringlike radiopaque appearance of the mandibular third right molar on panoramic x-ray. CT scan findings were suggestive that the intraosseous circular radiopaque formation was a dilated odontome. The alveotomy of the "tooth" was performed, and histopathological analysis of the inner and surrounding soft tissue revealed a diagnosis consistent with a dilated odontome. PMID:20123392

Cukovi?-Bagi?, Ivana; Macan, Darko; Dumanci?, Jelena; Manojlovi?, Spomenka; Hat, Josip

2010-02-01

209

Estudios físico-químicos de miscelas de aceites vegetales XIV. Volumen molar, refracción molar y viscosidad de disoluciones de estearato de metilo en ciciohexano, hexano, tetracloroetileno o tricloroetileno  

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In the miscelies studied, molar volume and molar refraction values show linear dependence with the molar fraction of methyl stearate. Viscosity values fit Hildebrand's modified equation, where the "Vo" parameter is a linear function of the molar fraction of methyl stearate. Regarding with this three physico-chemical properties, the mixtures studied behave like ideal mixtures of two organic liquids without ionization.

En todas las miscelas es...

Mun?oz Cueto, Mari?a J.; Gala?n Vallejo, M.; Flores Luque, V.

1991-01-01

210

Fertility preserving treatment in a nulliparous with a molar pregnancy: a case report.  

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Hydatidiform mole represents an abnormal form of conception that occurs in about one in 500-1000 pregnancies. It is a subtype of gestational trophoblastic disease. Hydatidiform moles should be regarded as premalignant lesions because 15-20% of complete hydatidiform moles (CHMs) and 1% of partial hydatidiform moles (PHMs) undergo malignant transformation into invasive moles, choriocarcinomas, or, in rare cases, placental-site trophoblastic tumors (PSTTs). We will illustrate the case of a 26-year-old nulliparous with a seven weeks amenorrhea, positive immunological pregnancy test, a ?-HCG value of 136 000 mIU÷mL and minor vaginal bleeding. The ultrasonographic examination showed an enlarged endometrium with adjacent hyperechoic material containing tiny anechoic spaces and an anembryonic pregnancy, distended endometrial cavity containing innumerable, variably sized anechoic cysts with intervening hyperechoic material ("snowstorm" appearance). The CT showed a uterine mass measuring 89÷111÷67 mm, inhomogeneous density, proliferative-infiltrative endocavitary tissue without exceeding the peritoneal serosa, and a few pulmonary micronodules with not certain origin on the left inferior lobe. In this case, due to the large infiltrative uterine mass, the risk of severe bleeding after curettage and the possibility of a necessity hysterectomy, we decided to apply first of all the Methotrexate protocol for molar pregnancy. PMID:24970000

Filipescu, George Alexandru; Boiangiu, Andreea Gratiana; Clim, Nicoleta; Andrei, Florin

2014-01-01

211

Successful use of the inferior mesenteric vein for renal transplantation.  

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For renal transplantation, the standard venous drainage of the allograft is via the iliac vein. In unusual circumstances, such as thrombosis or agenesis of the iliac veins and the inferior vena cava, portal venous drainage may be a suitable option. We report a case in which the inferior mesenteric vein was used for venous drainage of a cadaveric renal allograft. PMID:12859544

Patel, Pratik; Krishnamurthi, Venkatesh

2003-08-01

212

Maxillary Sinus Retention Cysts Protruding Into the Inferior Meatus  

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Although most of the maxillary sinus retention cysts are asymptomatic, a few of them increase in size and cause symptoms. However, they rarely erode bony walls nor protrude into the inferior meatus. I present 2 cases with maxillary sinus retention cysts protruding into the inferior meatus by making a large defect on the medial wall of the maxillary sinus.

Hong, Sung-lyong; Cho, Kyu-sup; Roh, Hwan-jung

2014-01-01

213

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

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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

214

Procedures to recover DNA from pre-molar and molar teeth of decomposed cadavers with different post-mortem intervals.  

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A task-force to resolve 26 pending forensic caseworks was carried out. We tested four different protocols to extract DNA from molar and pre-molar teeth from 26 cadavers with post-mortem intervals from 2 months to 12 years. We compared the amount of DNA and DNA profiles with the time elapsed between death and laboratory procedures. Molar or pre-molar teeth were removed from the corpses, cleaned, and DNA was extracted using 2 or 12h of incubation on lysis buffer and filtered using concentration column or precipitated with isopropanol. DNA profiles were obtained using PowerPlex16™ System PCR Amplification Kit, AmpFlSTR(®) Yfiler™ and/or mtDNA sequencing. Complete DNA profiles comparison and statistical evaluation allowed unambiguous identification of the 26 victims. No significant differences were observed in the amount of DNA obtained with the distinct incubation times. The use of concentration column resulted in an increased amount of DNA when compared to isopropanol. However, the lower concentration of DNA obtained with isopropanol seemed to have been compensated by the higher purity. No significant differences in the number of amplified loci were found. A non-significant tendency was found between the amount of total DNA recovered and the time elapsed between death and laboratory procedures. The increase of post-mortem time did not interfere in the analysed autosomal loci. In conclusion, molar and pre-molar teeth were shown to be good candidates to obtain satisfactory DNA profiles, suggesting the high potential of tooth samples as source for DNA typing independently of the decomposed corpse's time or laboratory procedures. PMID:23040740

Raimann, Paulo E; Picanço, Juliane B; Silva, Deborah S B S; Albuquerque, Trícia C K; Paludo, Francis Jackson O; Alho, Clarice S

2012-11-01

215

Adaptive global synchrony of inferior olive neurons  

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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

216

Leiomyosarcoma of the inferior vena cava.  

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The purpose of this article is to present the CT features in five cases of pathologically verified Inferior vena cava (IVC) leiomyosarcoma. In this retrospective analysis, we reviewed CT features in 5 cases of clinicopathologically confirmed IVC leiomyosarcoma with respect to its location (infra renal, trans renal, supra renal), its extent (with or without involvement of renal vein, hepatic IVC with or without involvement of hepatic vein, right atrial & extra caval extension) and pattern of enhancement. CT guided biopsy was performed in four patients while the last patient underwent successful resection of the tumor. Three male and two female patients (aged 45 to 72 years) were included in the study. Heterogeneously enhancing retroperitoneal mass involving IVC is the most common imaging feature. The intra and extra luminal extension was demonstrated excellently in all patients. IVC leiomyosarcoma is a rare neoplasm often presenting very late with non-specific symptoms. Cross sectional imaging establishes the exact location and extension and plays a vital role in determining the resectibility and planning the management. PMID:24784870

Naphade, Prashant S; Raut, Abhijit A; Hira, Priya; Vaideeswar, Pradip; Vadeyar, Hemant

2014-05-01

217

Standard molar enthalpies of formation of 1- and 2-cyanonaphthalene  

International Nuclear Information System (INIS)

Highlights: ? Enthalpies of formation of 1- and 2-cyanonaphthalene were measured by combustion calorimetry. ? Vapor pressures of crystalline 1- and 2-cyanonaphthalene obtained by Knudsen effusion mass loss technique. ? Enthalpies, entropies and Gibbs functions of sublimation at T = 298.15 K were calculated. - Abstract: The standard (po = 0.1 MPa) molar enthalpies of formation, in the crystalline state, of the 1- and 2-cyanonaphthalene were derived from the standard molar energies of combustion, in oxygen, at T = 298.15 K, measured by static-bomb combustion calorimetry. Vapor pressure measurements at different temperatures, using the Knudsen mass loss effusion technique, enabled the determination of the enthalpy, entropy, and Gibbs energy of sublimation, at T = 298.15 K, for both isomers. The standard molar enthalpies of sublimation, at T = 298.15 K, for 1- and 2-cyanonaphthalene, were also measured by high-temperature Calvet microcalorimetry. (table) Combining these two experimental values, the gas-phase standard molar enthalpies, at T = 298.15 K, were derived and compared with those estimated by employing two different methodologies: one based on the Cox scheme and the other one based on G3MP2B3 calculations. The calculated values show a good agreement with the experimental values obtained in this work.

218

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

219

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

220

Experimental standard molar enthalpies of formation of some methylbenzenediol isomers  

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The present work is part of a research program on the energetics of formation of alkyl substituted benzenediols, aiming the study of the enthalpic effect of the introduction of methyl substituents into benzenediols. In this work we present the results of the thermochemical research on 2-methylresorcinol, 3-methylresorcinol, 4-methylresorcinol, and methylhydroquinone. The standard (p{sup 0}=0.1MPa) molar enthalpies of formation, in the crystalline phase, at T = 298.15 K, of the compounds mentioned above were derived from their standard massic energies of combustion, measured by static-bomb combustion calorimetry, while the standard molar enthalpies of sublimation of those compounds were obtained by the temperature dependence of their vapour pressures determined by the Knudsen effusion technique. From experimental values, the standard molar enthalpies of formation of the studied methylbenzenediols in the gaseous phase, at T = 298.15 K were then derived. The results are interpreted in terms of structural contributions to the energetics of the substituted benzenediols and compared with the same parameters estimated from the Cox Scheme. Moreover, the standard (p{sup 0}=0.1MPa) molar enthalpies, entropies, and Gibbs energies of sublimation, at T = 298.15 K, were derived for the four isomers of methylbenzenediols.

Ribeiro da Silva, Manuel A.V. [Centro de Investigacao em Quimica, Department of Chemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P 4169-007 (Portugal)], E-mail: risilva@fc.up.pt; Lobo Ferreira, Ana I.M.C. [Centro de Investigacao em Quimica, Department of Chemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P 4169-007 (Portugal)

2009-10-15

 
 
 
 
221

Standard molar enthalpies of formation of 1- and 2-cyanonaphthalene  

Energy Technology Data Exchange (ETDEWEB)

Highlights: > Enthalpies of formation of 1- and 2-cyanonaphthalene were measured by combustion calorimetry. > Vapor pressures of crystalline 1- and 2-cyanonaphthalene obtained by Knudsen effusion mass loss technique. > Enthalpies, entropies and Gibbs functions of sublimation at T = 298.15 K were calculated. - Abstract: The standard (p{sup o} = 0.1 MPa) molar enthalpies of formation, in the crystalline state, of the 1- and 2-cyanonaphthalene were derived from the standard molar energies of combustion, in oxygen, at T = 298.15 K, measured by static-bomb combustion calorimetry. Vapor pressure measurements at different temperatures, using the Knudsen mass loss effusion technique, enabled the determination of the enthalpy, entropy, and Gibbs energy of sublimation, at T = 298.15 K, for both isomers. The standard molar enthalpies of sublimation, at T = 298.15 K, for 1- and 2-cyanonaphthalene, were also measured by high-temperature Calvet microcalorimetry. (table) Combining these two experimental values, the gas-phase standard molar enthalpies, at T = 298.15 K, were derived and compared with those estimated by employing two different methodologies: one based on the Cox scheme and the other one based on G3MP2B3 calculations. The calculated values show a good agreement with the experimental values obtained in this work.

Ribeiro da Silva, Manuel A.V., E-mail: risilva@fc.up.pt [Centro de Investigacao em Quimica, Department of Chemistry and Biochemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto (Portugal); Lobo Ferreira, Ana I.M.C.; Barros, Ana L.M.; Bessa, Ana R.C.; Brito, Barbara C.S.A.; Vieira, Joana A.S.; Martins, Silvia A.P. [Centro de Investigacao em Quimica, Department of Chemistry and Biochemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto (Portugal)

2011-09-15

222

Apical Closure of Immature Molar Roots: A Rare Case Report  

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This is a rare case report of apexification in an immature permanent mandibular first molar. Calcium hydroxide was used for apical root closure of both the mesial and distal canals. Root closure occurred after 13 months following which obturation of the tooth was completed.

A, Deepti; S, Shifa; Ms, Muthu; Prabhu V, Rathna

2008-01-01

223

Anquilose em molares decíduos - relato de caso clínico  

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and/or invasive options for treatment and continuous care.This article relates a case report of severe bilateral ankylosis of lower deciduous molars, whose proposed treatment was the extraction and the installation of a space regain. Therefore, we tried to avoid an occlusal disharmony.

Milca Telles dos Santos

2009-01-01

224

Radiofrequency inferior turbinate reduction improves smell ability of patients with chronic rhinitis and inferior turbinate hypertrophy.  

Science.gov (United States)

Radiofrequency inferior turbinate reduction (RFITR) of inferior turbinate hypertrophy (ITH) is an effective way to treat patients with intractable nasal mucosal obstruction. The objective of this study was to assess smell ability, nasal symptoms, inferior turbinate grading (ITG), peak nasal inspiratory flow (PNIF) of patients with chronic rhinitis (CR), and ITH before and after RFITR. Patients with CR and ITH, aged 18-60 years, who underwent RFITR, were prospectively recruited. Smell ability (measured by smell detection threshold [SDT]), visual analog scale (VAS) of nasal symptoms, ITG, and PNIF before and 6-10 weeks after RFITR were compared. Forty-eight subjects were included. All nasal symptoms were significantly decreased after RFITR. After surgery, SDT (tested by phenyl ethyl alcohol) was worsened in 7 patients (14.6%), improved in 8 patients (16.7%), and did not change in 33 patients (68.7%). SDT after RFITR of six patients in the worsened SDT group were still within normal range (> -6.5). There was only one patient whose SDT changed from normosmia to mild hyposmia (-7.25 to -5.38). In the improved SDT group, two of eight patients had obviously better SDT after RFITR, which changed from moderate hyposmia to normosmia (-3.65 to -10; -3.73 to -10), whereas six of eight patients had little better SDT after RFITR. RFITR also significantly reduced ITG and improved PNIF. In conclusion, the treatment of patients with CR and ITH with RFITR significantly improved PNIF, ITG, and nasal symptoms assessed by VAS, although SDT after RFITR could be the same or improved or worsened. PMID:24612902

Assanasen, Paraya; Choochurn, Panyalak; Banhiran, Wish; Bunnag, Chaweewan

2014-03-01

225

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

226

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

227

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)

228

Partial Molar Volumes for Lanthanide Sesquioxides in Sodium Silicate Melts  

Science.gov (United States)

Lanthanides are of great interest in igneous petrology as trace indicators of magmatic processes that control the origin and evolution of igneous rocks. A key to the petrogenetic modelling of magmatic processes and to determine the phase diagrams of lanthanide host phases is the accurate determination of the physico-chemical and thermodynamic properties of lanthanide-containing materials, such as the volumetric properties of lanthanide-bearing silicate melts. Therefore, we have undertaken to provide a new reliable volumetric data set for lanthanide-bearing silicate melts which allows the available models in the literature to be extended to lanthanide-bearing melts. For this purpose, the densities of various lanthanide-bearing silicate melts distributed along various pseudo-binary joins, where the end-members are Na-disilicate and one of the lanthanide sesquioxides (i.e., Ce2O3, Pr2O3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, Tb2O3, Dy2O3, Ho2O3, Er2O3, Tm2O3 and Yb2O3), have been measured using the double-bob Archimedean method. The present results show that the addition of any lanthanide to Na-disilicate leads to an increase in the melt density and that the melt density increases with increasing atomic number of the lanthanide. From the present density data set, the molar volumes of these melts have been calculated and the partial molar volumes of each lanthanide sesquioxide in these melts have been determined using a linear regression through each pseudo-binary join (i.e., Na-disilicate - lanthanide sesquioxide). This study indicates ideal behaviour with respect to the molar volume (i.e., a linear variation of the molar volume along each pseudo-binary join) for Na-silicate melts containing up to 10 mol% of lanthanide oxide. Comparison between the partial molar volumes of lanthanide sesquioxides obtained in this study and the molar volumes of molten lanthanide sesquioxides given in the literature raise the possibility however that this ideality is not maintained along the entire Na-disilicate - lanthanide sesquioxide pseudo-binary joins. Excess volumes of mixing appear to be required to describe the combined volumetric data set.

Courtial, P.; Dingwell, D. B.

2004-12-01

229

Morbilidad de la extracción de los terceros molares en pacientes entre los 12 y 18 años de edad / Morbidity of third molar extraction in patients between 12 and 18 years of age  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: Spanish Abstract in spanish Objetivo: El propósito de este estudio fue analizar la incidencia de complicaciones después de la extracción quirúrgica de los terceros molares en pacientes de 12 a 18 años de edad. Pacientes y método: Se realizó un estudio retrospectivo de 390 extracciones quirúgicas de terceros molares superiores [...] e inferiores en 173 pacientes en edades comprendidas entre los 12 y 18 años de edad, intervenidos bajo anestesia locorregional en el año 2000 en el Máster de Cirugía Bucal e Implantología Bucofacial de la Universidad de Barcelona. Los pacientes fueron divididos en tres grupos (A: 12-14 años, B:15-16 años, C: 17-18 años). Se registró la edad y el sexo del paciente, el motivo de la extracción, el grado de desarrollo dentario, la posición, la angulación y la inclusión del tercer molar. Finalmente se valoró la asociación entre dichas variables y la aparición de complicaciones postoperatorias. Resultados: La mayoría de los pacientes intervenidos fueron del sexo femenino (66,9%), y el grupo de edad en la que se realizó el mayor número de extracciones (62,8%) fue en el grupo C (17-18 años). El principal motivo de extracción fue la indicación por parte del ortodoncista (40,5%), seguido por la indicación profiláctica (39,5%). La presencia de clínica fue el motivo de extracción en un 20% de los casos. Se observó una incidencia del 15,6% de complicaciones postoperatorias tras la extracción de 390 terceros molares. En el grupo A el riesgo de complicaciones fue de 17,4%, en el grupo B de 19% y en el grupo C de 13,7%. Todas las complicaciones fueron reversibles y de corta duración como el dolor y la inflamación persistente, la infección, el trismo y la equimosis. Se presentó un caso de parestesia del nervio dentario inferior y un caso de parestesia del nervio lingual que remitieron a los 2 meses y al mes respectivamente. Conclusiones: este estudio demuestra que no hay diferencias significativas en las complicaciones observadas entre los tres grupos de edad, y por lo general, éstas son leves y reversibles. Se observó una mayor tendencia de complicaciones en las mujeres y el porcentaje de complicaciones aumenta cuanto menor es el espacio disponible para la erupción. Abstract in english Objective: An analysis is made of the incidence of complications following third molar surgical extraction in patients between 12 and 18 years of age. Patients and method: A retrospective study was conducted of 390 surgical extractions of upper and lower third molars in 173 patients operated upon un [...] der locoregional anesthesia during the year 2000 in the Master in Oral Surgery and Implantology of Barcelona University Dental School (Spain). The patients were divided into three age groups (A: 12-14 years, B: 15-16 years, C: 17-18 years). The reason for extraction, the degree of dental development, and third molar position, angle and impaction were recorded. Finally, the association of these variables to the appearance of postoperative complications was analyzed. Results: Most patients were females (66,9%), and the age group in which most extractions were carried out (62,8%) corresponded to Group C (17-18 years). The main reason for extraction was orthodontist indication (40,5%), closely followed by prophylaxis (39,5%). The existence of clinical manifestations was an indication for extraction in 20% of cases. The postoperative complications rate after the extraction of the global 390 molars was 15,6%. In Groups A, B and C the complication risks were 17,4%, 19% and 13,7%, respectively. All complications were reversible and of short duration. One case each of inferior alveolar nerve paresthesia and lingual nerve paresthesia was recorded, which subsided after one and two months, respectively. Conclusions: There were no significant differences in complications between the three age groups. An increased tendency towards complications was observed in females, and the percentage of postoperative problems increased.

Angie Virginia, Chaparro Avendaño; Silvia, Pérez García; Eduard, Valmaseda Castellón; Leonardo, Berini Aytés; Cosme, Gay Escoda.

2005-12-01

230

Three rooted, four canalled mandibular first molar (Radix Entomolaris).  

Science.gov (United States)

A mandibular first molar with two distal roots is an interesting example of anatomic variation. This paper describes case reports of mandibular first molar with three roots (one mesial and two distal) and four canals (two in mesial and one in each distobuccal and distolingual root). The canals were shaped with protaper rotary files and irrigated with 5.25% sodium hyochlorite, 0.2 %w/v of chlorhexidine gluconate and normal saline as the fi nal irrigant. The canals were then obturated with gutta- percha and AH plus sealer. These case reports show an anatomic variation of internal morphology of the tooth and points out the importance of searching for additional canals. PMID:20071878

Parolia, Abhishek; Kundabala, M; Thomas, M S; Mohan, M; Joshi, N

2009-01-01

231

Desplazamiento de un tercer molar superior al espacio facial bucal  

Directory of Open Access Journals (Sweden)

Full Text Available La exodoncia del tercer molar superior es uno de los procedimien- tos quirúrgicos más comunes que pueden cursar con complica- ciones tras y posoperatorias, mismas que suelen ser frecuentes, como: hemorragia, dolor, fracturas óseas, comunicación sinusal, lesiones vasculares y nerviosas; o excepcionales, como el des- plazamiento del órgano dental al espacio facial bucal, resultado de la aplicación de fuerzas excesivas y técnicas quirúrgicas incorrectas. Se comunica el caso clínico de una paciente de 35 años de edad con el diagnóstico de desplazamiento del tercer molar superior derecho al espacio facial bucal, así como la des- cripción de las características clínicas, auxiliares de diagnóstico y la técnica quirúrgica de enucleación. Actualmente la paciente se encuentra en recuperación.

Diana Araceli D\\u00E1vila Hern\\u00E1ndez

2013-01-01

232

Distalização dos molares superiores com aparelho Pendex: estudo cefalométrico prospectivo  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese A distalização dos molares superiores constitui um desafio na correção da má oclusão de Classe II em tratamentos sem extrações dentárias e sem avanço mandibular. Há uma procura por dispositivos que substituam a tração extrabucal (AEB) e que não exijam demasiada colaboração do paciente, o que estimul [...] a os ortodontistas a testarem métodos alternativos aos relatados na literatura. Dentre estes, destacam-se os aparelhos Pêndulo e Pendex de Hilgers. OBJETIVO: a realização desta pesquisa teve o intuito de avaliar, mediante a cefalometria, os efeitos do aparelho Pendex aplicado no final da dentadura mista e na dentadura permanente. METODOLOGIA: a amostra constou de 14 pacientes com má oclusão de Classe II bilateral, com média de idade de 11 anos e 3 meses. Foram tomadas duas telerradiografias em norma lateral, uma correspondente ao início do tratamento e outra aproximadamente 5 meses após sua finalização, quando a relação dos molares encontrava-se sobrecorrigida. RESULTADOS: após a determinação e mensuração das grandezas cefalométricas lineares e angulares e análise estatística (Teste t de Student), pode-se concluir que os efeitos do aparelho Pendex foram predominantemente ortodônticos: distalização da coroa dos primeiros molares permanentes numa velocidade média de 0,8 mm/mês e vestibularização dos incisivos superiores com aumento do trespasse horizontal. CONCLUSÃO: assim sendo, quando há indicação para distalização dos molares, cumpre-se fazer uma análise dos fatores envolvidos, a fim de eleger, com prudência, a solução terapêutica mais adequada às exigências individuais e profissionais. Abstract in english The upper molar distalization is a challenge in the Class II malocclusion correction in treatments without dental extraction and without mandibular advance. There is a search for appliances that replace the extrabuccal traction (AEB) and do not require patient cooperation, that stimulate the orthodo [...] ntists to test the alternative methods related in the literature. Among these, we see the Hilgers' Pendulum and Pend-X appliances. AIM: The realization of this research has the aim to evaluate, through the cephalometry, the effects of the Pend-X appliance applied in the end of the mixed dentition and in the permanent too. METHODS: The sample consisted of 14 patients with bilateral Class II malocclusion and with mean age of 11 years and 3 months old. Two teleradiographies were taken in the lateral norm, one was correspondent to the beginning of the treatment and the other one after approximately 5 months, when the molars relation were overcorrected. RESULTS: After the determination and measurement of angular and linear cephalometry quantities and the statistical analysis (Student's t tests) could one to conclude that the effects of the Pend-X appliance were predominantly dental: first molars crown distalization in a mean speed of 0.8mm/month and superior incisive vestibularization with overjet increase. CONCLUSION: So, when there is indication to molars distalization, we have to analyse the involved factors to elect, with prudence, the most adequated therapeutic solution with the individual and professional exigencies.

Eduardo César Almada, Santos; Omar Gabriel da, Silva Filho; Patrícia Maria Pizzo, Reis; Francisco Antônio, Bertoz.

233

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

234

Thermal correction to the molar polarizability of a Boltzmann gas  

Science.gov (United States)

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 Lorentz 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.; Puchalski, M.; Mohr, P. J.

2011-12-01

235

CONTRIBUTIONS TO MOLDOVA RIVER’S INFERIOR BASIN VEGETATION KNOWLEDGE  

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Full Text Available Authors describes in this paper two vegetal associations (mesophyllus grasslands, Festuco rubrae-Agrostetum capillaris Horvati? 1951 and Trisetetum flavescentis R?bel 1911 from the inferior basin of Moldova river.

M?RIU?A CONSTANTIN

2004-01-01

236

Desplazamiento de un tercer molar superior al espacio facial bucal  

Digital Repository Infrastructure Vision for European Research (DRIVER)

La exodoncia del tercer molar superior es uno de los procedimien- tos quirúrgicos más comunes que pueden cursar con complica- ciones tras y posoperatorias, mismas que suelen ser frecuentes, como: hemorragia, dolor, fracturas óseas, comunicación sinusal, lesiones vasculares y nerviosas; o excepcionales, como el des- plazamiento del órgano dental al espacio facial bucal, resultado de la aplicación de fuerzas excesivas y técnicas quirúrgicas incorrectas. S...

Ndez, Diana Araceli D. U. E. Vila Hern U. E.

2013-01-01

237

Complication of Invasive Molar Pregnancy with Clostridium perfringens Sepsis  

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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 ...

Sanmeet Singh; Kunal Angra; Bonnie Davis; Babak Shokrani

2014-01-01

238

Characteristics of 351 supernumerary molar teeth In Turkish population  

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Objective: The aim of the present study was to evaluate the demographic profile of supernumerary molar (SM) teeth in people in various regions of Turkey. Study Design: A retrospective analysis was carried out on an initial sample of 104,902 subjects drawn from the ortopantographics files from 10 clinics in 7 Turkish cities with documentation of demographic data, the presence of SM teeth, their location, eruption, morphology, and position within the arch. In one region associated patho­lo...

Kara, Muhammed I?; Aktan, Ali M.; Ay, Sinan; Bereket, Cihan; S?ener, I?smail; Bu?lbu?l, Mehmet; Ezirganl?, S?eref; Polat, Hidayet B.

2012-01-01

239

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

240

Fibroblast cell proliferation in the mouse molar periodontal ligament.  

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Cytogenesis of the developing molar periodontal ligament was studied by determining labelling indices in 4 groups of young mice. Autoradiographs were made using paraffin sections of demineralised specimens from 10 days, 12 days, 16 days and 20 days old mice allowed to survive a varying period (1--96 hours) after the administration of [3H]thymidine. Labelled fibroblasts in number per unit area were counted over three different zones (apical, middle and cervical) of the sections and labelling i...

Perera, K. A.; Tonge, C. H.

1981-01-01

 
 
 
 
241

A Neanderthal lower molar from Stajnia Cave, Poland.  

Science.gov (United States)

The primary aim of this study was to conduct a taxonomic assessment of the second of three isolated human teeth found in the Stajnia Cave (north of the Carpathians, Poland) in 2008. The specimen was located near a human tooth (S5000), which was identified by Urbanowski et al. (2010) as a Neanderthal permanent upper molar. Both of these teeth were excavated from the D2 layer, which belongs to the D stratigraphic complex comprising the archaeological assemblage associated with the Micoquian tradition. An Ursus spelaeus bone and Mammuthus primigenius tooth that were also excavated from the D2 layer were dated to >49,000 years BP (by AMS (14)C) and 52.9 ka BP (by U-Th), respectively. The sediment overlying stratigraphic complex D was dated to 45.9 ka BP by the OSL method. The S4300 tooth is a lower first or second permanent molar belonging to an individual other than that who once possessed the S5000 tooth. The S4300 tooth exhibits a combination of traits typical of Neanderthal lower molars, including a mid-trigonid crest, large anterior fovea, taurodontism and subvertical grooves on the interproximal face, indicating that this tooth belonged to a Neanderthal individual. The S4300 tooth from Stajnia Cave is one of the oldest human remains found in Poland. PMID:23415376

D?browski, P; Nowaczewska, W; Stringer, C B; Compton, T; Kruszy?ski, R; Nadachowski, A; Stefaniak, K; Urbanowski, M

2013-04-01

242

A 3-dimensional analysis of molar movement during headgear treatment.  

Science.gov (United States)

Superimposition of serial cephalograms provides a limited description of tooth movement that could be complemented by data obtained from serial dental casts. The aim of this study was to develop a mathematical method for superimposing 3-dimensional data obtained from selected landmarks on longitudinally collected dental casts to describe maxillary first molar movement during headgear treatment. The material consisted of dental casts taken bimonthly from 36 children whose Class II Division 1 malocclusion was treated with straight-pull headgear during a 24-month period. Control data were collected from initial and final models of 38 subjects with a similar malocclusion who were not treated during a 24-month observation period. Spatial data from each subject's initial model were oriented similarly in an anatomically derived coordinate system, and a best-fit superimposition of palatal rugae landmarks from subsequent models allowed the measurement of molar movement. On average, headgear treatment resulted in distal movement of the molars, and the fitted net difference between treated and control subjects was 3.00 mm (SE, 0.37 mm; P pattern of tooth movement. Several reasons could account for the wide range of individual variation and warrant exploration. PMID:11786867

Ashmore, Jennifer L; Kurland, Brenda F; King, Gregory J; Wheeler, Timothy T; Ghafari, Joseph; Ramsay, Douglas S

2002-01-01

243

Injuries of the retrohepatic inferior vena cava and the liver  

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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 ...

Koprivica Radenko; Cvijovi? Radiša; Koprivica Ranka; Smiljani? Radmila

2008-01-01

244

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

245

A Comprisionol two Anesthetic Technique (mandibular block versus in filtration in Restorative Treatment of Class I Second Mandibular Molars in 5-8 Years Children  

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Full Text Available Introduction: Inferior mandibular bolck anesthesia, some time causes postoperative lip and tongue biting trauma, however, an infiltration injection with a limited anesthetized area, has less complications. The aim of present study is to compare of two techniques (block and infiltration for class I restorative treatment in primary second molars.Methods and Materials: Fourty children between 5-8 years old having bilateral calss I caries lesions on mandibular primary second molars were selected. Bite wing radiography was used to exclude proximal caries before operation. Operation was made by first using infiltration technique on one side and using block technique on the other side 72 hours later. Standard block injection technique was performed. Infiltration technique consisted of injecting half of a carpule in the bottom of vestibule between roots of the tooth and injection of 2 drops of anesthetic in mesial and distal papillae after 5 minutes. Pain was assessed using SEM (Sound, Eyes, Motor scale by an observer who did not know which technique was used. SEM scale is a reliable and easy to administer for assessment of pain.Results: Pain during operation for both techniques, scored by SEM, was compared and there was no significant difference between block and infiltration techniques.Conclusion: Results show, according to less density of bone in buccal plate and less need to a profound anesthesia for minor restorative treatment, infiltration rechnique can be used instead of block injection in mandibular primary molars in 5-8 years children.

M - Jafaerzadeh

2006-01-01

246

Thermodynamic properties of binary mixtures containing tetrahydropyran: Excess molar volumes, excess molar enthalpies and isentropic compressibilities changes of mixing  

International Nuclear Information System (INIS)

Excess molar volumes, VE, excess molar enthalpies, HE and speeds of sound, u data of tetrahydropyran (i) + cyclohexane or n-hexane or n-heptane (j) binary mixtures have been measured using dilatometer, calorimeter and interferometer over whole mole fraction range at 308.15 K. Speeds of sound data have been utilized to predict isentropic compressibilities changes of mixing, ?SE. The analysis of VE in terms of Graph theory reveals that (i + j) mixtures are characterized by dipole-induced dipole interactions between THP and cyclo or n-alkanes to form 1:1 molecular complex. HE and ?SE data of the investigated mixtures have also been analyzed in terms of Graph theory. VE, HE and ?SE data predicted by Graph theory compare well with their corresponding experimental values.

247

Apparent molar and partial molar volumes of aqueous ceric ammonium nitrate solutions at 20, 25, 30, and 35°C  

Science.gov (United States)

Present paper reports the measured densities (?) and refractive indices ( n D) of aqueous solutions of ceric ammonium nitrate (CAN) at 20, 25, 30, and 35°C in different concentrations of solution. Apparent molar volumes (?v) have been calculated from the density data at different temperatures and fitted to Massons relation to get limiting partial molar volumes (?{v/0}) of CAN. Refractive index data were fitted to linear dependence over concentration of solutions and values of constant K and n {D/0} for different temperatures were evaluated. Specific refractions ( R D) of solutions were calculated from the refractive index and density data. Concentration and temperature effects on experimental and derived properties have been discussed in terms of structural interactions.

Deosarkar, S. D.; Wanale, S. G.; Shelke, M. P.

2014-07-01

248

Cephalometric evaluation of the effect of third molar eruption on skeletal facial height  

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AbstractIntroduction: The influence of third molar eruption on vertical facial growth has been evaluated less frequently by researchers. The aim of this study was cephalometric evaluation of the effect of third molar eruption on skeletal facial height.Materials and Methods: The subjects in this cross-sectional/analytical study consisted of thirty patients with four completely erupted third molars with proper occlusal relationships (group A) and thirty patients without third molars (group B). ...

Mostafa Shahabi; Amin Mahdaviasl; Javad Faradmal; Seyedeh Maryam Tayari; Amirabbas Jafari; Mehrnoush Rostampour

2012-01-01

249

Surgical extraction of mandibular third molar in pterygomandibular space: a case report.  

Science.gov (United States)

Impacted mandibular third molars are located between the second mandibular molar and mandibular ramus. However, ectopic mandibular third molars with heterotopic positions are reported in the subcondylar or pterygomandibular space. The usual cause of malposition is a cyst or tumor, and malposition without a pathology is rare. This case report described an impacted mandibular third molar in the pterygomandibular space without any associated pathology. PMID:24471052

Lee, Young-Kyu; Park, Sung-Soo; Myoung, Hoon

2013-10-01

250

Síndrome de compresión de vena cava inferior secundario a fibrosis retroperitoneal Inferior vena cava compression syndrome secondary to retroperitoneal fibrosis  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Se estudió un paciente de 57 años de edad, de tez negra, con edemas en miembros inferiores relevantes por su volumen y extensión. Se realizó la discusión clínica la cual orientó hacia la búsqueda de una lesión o tumor retroperitoneal asociado a un síndrome de compresión u obstrucción de vena cava inferior y se comprobó imagenológicamente. La confirmación histológica se obtuvo por vía quirúrgica.We studied a 57 year-old patient of black complexion, with swelling of the lo...

Alberto Miranda Bravo; Collazo-ramos, Milagros I.; Asbel Vicente de la Cruz; Digna Chávez Jiménez

2010-01-01

251

Deuterium isotope effect on molar heat capacities and apparent molar heat capacities in dilute aqueous solutions: A multi-channel heat-flow microcalorimeter study  

International Nuclear Information System (INIS)

The molar heat capacities of chloroform, dichloromethane, methanol, acetonitrile, acetone, dimethyl sulfoxide, benzene, dimethylformamide, toluene, and cyclohexane, as well as their deuterated isotopologues, were measured using a multi-channel heat conduction TAM (Thermal Activity Monitor) III microcalorimeter. In addition, the apparent molar heat capacities of some of the associated dilute aqueous solutions (0.0039 i < 0.0210) were also measured. A temperature drop method from (298.15 to 297.15) K at 0.1 MPa was employed. The corresponding heat capacities were determined from the integration of the measured heat flow. The heat capacity results are shown to be in good to very good agreement with the available literature values. In addition, good correlations were obtained for the effect of isotopic substitution on both molar heat capacity and apparent molar heat capacity in aqueous solutions. These correlations should be useful in the prediction of the molar heat capacities or the apparent molar heat capacities of other deuterated compounds. Since these measurements were conducted with ampoules, the effects of heat of condensation and/or vapor space on the accuracy of the heat capacity determinations are discussed. The overall results from this study demonstrate the utility of a multi-channel heat conduction microcalorimeter in obtaining good reproducibility and good accuracy for molar heat capacities as well as apparent molar heat capacities as well as apparent molar heat capacities from simultaneous samples

252

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

253

Angle Class III malocclusion treated with mandibular first molar extractions.  

Science.gov (United States)

A Class III malocclusion associated with dental asymmetry is a complex diagnostic and treatment problem in orthodontics. The goals of maintaining or improving the facial profile and achieving good function are decisive factors when considering whether to plan a surgical or a nonsurgical treatment approach. A fixed appliance in combination with extractions could be considered for nonsurgical management of this type of malocclusion in the permanent dentition. This article presents the results of an orthodontic approach to a Class III subdivision malocclusion in an adult treated with mandibular first molar extractions. The extractions provided the space needed to correct the overjet and overbite and to improve the intercuspation. PMID:22920705

Ruellas, Antonio Carlos de Oliveira; Baratieri, Carolina; Roma, Mariana Bottino; Izquierdo, Antonio de Moraes; Boaventura, Luciana; Rodrigues, Carina Souza; Telles, Vicente

2012-09-01

254

A new spectrometer to measure the molar Planck constant  

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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

255

Hitos de la perspectiva molar del condicionamiento clásico  

Directory of Open Access Journals (Sweden)

Full Text Available En este artículo se revisan los acontecimientos históricos fundamentales en la teoría del condicionamiento clásico como fenómeno psicológico ?comportamental o cognoscitivo?, es decir, desde una perspectiva molar, en oposición a una perspectiva molecular, que es propia de las neurociencias. Se analizan los siguientes acontecimientos o hitos: la teoría reflexológica de Vladimir Bechterev, la perspectiva conductista radical de B. F. Skinner, el modelo de Rescorla y Wagner (1972, los modelos atencionales de Mackintosh (1975 y de Pearce y Hall (1980, las teorías que se basan en los procesos oponentes, de Allan Wagner (1981; Wagner & Brandon, 1989, y las teorías que se basan en el control temporal del comportamiento (Gallistel & Gibbon, 2002.

Andr\\u00E9s M. P\\u00E9rez Acosta

2003-01-01

256

Determination of the molar concentration of messenger RNA  

International Nuclear Information System (INIS)

Purification of messenger RNA and mRNA precursors with columns of oligo (dT)-cellulose or poly(U)-Sepharose results in a highly enriched but nevertheless impure population of polyadenylated molecules. Since the contaminating molecules, principally rRNA, are present in variable but often significant amounts, methods for quantifying the polyadenylated component are required. This chapter presents a technique for determining the mole fraction poly(A)+ RNA and its molar concentration in the presence of roughly equivalent amounts of poly(A)- RNA. The method consumes about 75-100 ng of total RNA and takes about 45 min to perform

257

Assessment of the relationship between the maxillary molars and adjacent structures using cone beam computed tomography  

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This study investigated the relationship between the roots of the maxillary molars and the maxillary sinus using cone beam computed tomography (CBCT), and measured the distances between the roots of the maxillary molars and the sinus floor as well as the thickness of the bone between the root and the alveolar cortical plate. The study sample consisted of 83 patients with normally erupted bilateral maxillary first and second molars. A total of 332 maxillary molars were examined using CBCT images. The vertical relationship of each root with the maxillary sinus was classified into four types on CBCT cross-sectional images. The distance between the sinus floor and root and the bone thickness between the root and alveolar cortical plate were measured. In the buccal roots of the maxillary molars, a root protruding into the sinus occurred most frequently. A root projecting laterally along the sinus cavity was most common in the palatal roots of the maxillary first molars. The mesiobuccal roots of the maxillary second molar were closest to the sinus. The mesiobuccal roots of the first molars were closest to the cortical plate. The relationship between the roots of the maxillary molars and the sinus differed between the buccal and palatal roots. A root protruding into the sinus occurred more frequent in the buccal roots of the maxillary molars. The mesiobuccal root of the maxillary second molar was closest to the maxillary sinus floor and farthest from the alveolar cortical plate.

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

2012-09-15

258

Comparative study of third molar impaction in rural and urban areas of South-Western Nigeria.  

Science.gov (United States)

This study was carried out in the urban and rural areas of Southwest Nigeria with the objective of comparing the pattern of third molar impaction. A total of two thousand four hundred (2,400) subjects aged 20 years and above were examined for third molar impaction and radiographs taken for all suspected cases. Analysis of the finding in this study revealed that there was an increase in the prevalence of third molar impaction in the urban areas (10.7%) when compared with the rural populations (1.1%). It could be demonstrated that third molar impaction is more of a problem of urban youths than the older age groups. Civilization and change of diet seemed to be responsible for the observed differences in third molar impaction in the two geographical areas. This study also revealed that mesioangular impaction of lower third molar and vertical impaction of upper third molar was the commonest respectively in both communities. PMID:11372160

Olasoji, H O; Odusanya, S A

2000-06-01

259

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 SciELO Colombia | Language: Spanish Abstract in spanish 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

260

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

International Nuclear Information System (INIS)

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.

 
 
 
 
261

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

Energy Technology Data Exchange (ETDEWEB)

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

262

Intra- and interspecific variation in macaque molar enamel thickness.  

Science.gov (United States)

Enamel thickness has played an important role in studies of primate taxonomy, phylogeny, and functional morphology, although its variation among hominins is poorly understood. Macaques parallel hominins in their widespread geographic distribution, relative range of body sizes, and radiation during the last five million years. To explore enamel thickness variation, we quantified average and relative enamel thickness (AET and RET) in Macaca arctoides, Macaca fascicularis, Macaca fuscata, Macaca mulatta, Macaca nemestrina, and Macaca sylvanus. Enamel area, dentine area, and enamel-dentine junction length were measured from mesial sections of 386 molars scanned with micro-computed tomography, yielding AET and RET indices. Intraspecific sex differences were not found in AET or RET. Macaca fuscata had the highest AET and RET, M. fascicularis showed the lowest AET, and M. arctoides had the lowest RET. The latitudinal distribution of macaque species was associated with AET for these six species. Temperate macaques had thicker molar enamel than did tropical macaques, suggesting that thick enamel may be adaptive in seasonal environments. Additional research is needed to determine if thick enamel in temperate macaques is a response to intensified hard-object feeding, increased abrasion, and/or a broader diet with a greater range of food material properties. The extreme ecological flexibility of macaques may prohibit identification of consistent trends between specific diets and enamel thickness conditions. Such complications of interpretation of ecological variability, dietary diversity, and enamel thickness may similarly apply for fossil Homo species. PMID:25146639

Kato, Akiko; Tang, Nancy; Borries, Carola; Papakyrikos, Amanda M; Hinde, Katie; Miller, Ellen; Kunimatsu, Yutaka; Hirasaki, Eishi; Shimizu, Daisuke; Smith, Tanya M

2014-11-01

263

The expression pattern of FHL2 during mouse molar development.  

Science.gov (United States)

Four and a half LIM domains 2 (FHL2) functions as a transcriptional co-activator or co-repressor in a cell-type-specific manner. As a positive regulator, FHL2 plays an important role in osteoblast differentiation and bone formation. Our previous study showed that FHL2 was expressed in odontoblasts in mature human teeth under normal and pathological conditions. The purpose of this study was to investigate the spatial-temporal expression patterns of FHL2 at different stages of mouse molar development by immunohistochemistry. Our results showed that at the bud and cap stage, FHL2 was expressed both in enamel organ and the underlying mesenchyme. At the early bell stage, FHL2 appeared in the inner and outer enamel epithelium, stratum intermedium and the secondary enamel knot. Positive staining gradually converged at the cusps of dental papilla. At the late bell stage, FHL2 was expressed in the terminal differentiated ameloblasts and odontoblasts and stratum intermedium. At the postnatal day, FHL2 was detected in the secretory and mature ameloblasts and odontoblasts and mature enamel, and gradually appeared at Hertwig's epithelial root sheath and periodontal tissues. The spatial-temporal expression patterns of FHL2 from the bud stage to the postnatal day (13.5) suggested that during tooth development, FHL2 might play an important role in ameloblast and odontoblast differentiation, secretion of enamel and dentin matrix, mineralization of enamel, molar crown morphogenesis, as well as root formation. PMID:22461197

Du, Jianxin; Wang, Qiang; Wang, Li; Wang, Xiaoying; Yang, Pishan

2012-06-01

264

Standard molar enthalpies of formation of hydroxy-, chlor-, and bromapatite  

International Nuclear Information System (INIS)

The standard (p0 =0.1MPa) molar enthalpies of formation in the crystalline state of hydroxyapatite, chlorapatite and a preliminary value for bromapatite, at T=298.15K, were determined by reaction-solution calorimetry as: ?fHm0 [Ca10(PO4)6(OH)2,cr]=-(13399+/-11)kJ.mol-1,?fHm0 [Ca10(PO4)6Cl2,cr]=-(13231+/-82)kJ.mol-1,and?fHm0 [Ca10(PO4)6Br2,cr]=-(13063+/-81)kJ.mol-1. A critical assessment of these results and of previously published data is made. Finally, the standard molar enthalpy of formation of iodapatite is estimated as ?fHm0 [Ca10(PO4)6I2,cr]=-12949kJ.mol-1, from a linear correlation of ?fHm0 [Ca10(PO4)6X2,cr] (X=OH, F, Cl, Br) against the corresponding ?fHm0 [CaX2,cr

265

Infinitely dilute partial molar properties of proteins from computer simulation.  

Science.gov (United States)

A detailed understanding of temperature and pressure effects on an infinitely dilute protein's conformational equilibrium requires knowledge of the corresponding infinitely dilute partial molar properties. Established molecular dynamics methodologies generally have not provided a way to calculate these properties without either a loss of thermodynamic rigor, the introduction of nonunique parameters, or a loss of information about which solute conformations specifically contributed to the output values. Here we implement a simple method that is thermodynamically rigorous and possesses none of the above disadvantages, and we report on the method's feasibility and computational demands. We calculate infinitely dilute partial molar properties for two proteins and attempt to distinguish the thermodynamic differences between a native and a denatured conformation of a designed miniprotein. We conclude that simple ensemble average properties can be calculated with very reasonable amounts of computational power. In contrast, properties corresponding to fluctuating quantities are computationally demanding to calculate precisely, although they can be obtained more easily by following the temperature and/or pressure dependence of the corresponding ensemble averages. PMID:25325571

Ploetz, Elizabeth A; Smith, Paul E

2014-11-13

266

Embarazo ectópico molar tubárico: a propósito de un caso clínico  

Scientific Electronic Library Online (English)

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.

267

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

268

Bifid inferior turbinate: a report of two cases.  

Science.gov (United States)

Nasal turbinates are functionally important structures which extend from the lateral nasal walls to the nasal cavity. Lateral nasal wall anomalies are usually asymptomatic lesions which are incidentally detected. The most common variation of the lateral nasal wall is the pneumatization of turbinates. Anatomical variations of paranasal structures may present confusing intranasal landmarks. This may cause challenges in endoscopic sinus surgery. Bifid inferior turbinate is an extremely rare condition. In this article, we present two cases with bifid inferior turbinate. This variation should be kept in mind as a rare cause of nasal obstruction. PMID:25547752

Y?lmaz, Mahmut Sinan; Güven, Mehmet; Akidil, Öznur; Kayaba?o?lu, Gürkan

2014-01-01

269

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

270

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

271

Síndrome de compresión de vena cava inferior secundario a fibrosis retroperitoneal Inferior vena cava compression syndrome secondary to retroperitoneal fibrosis  

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Full Text Available Se estudió un paciente de 57 años de edad, de tez negra, con edemas en miembros inferiores relevantes por su volumen y extensión. Se realizó la discusión clínica la cual orientó hacia la búsqueda de una lesión o tumor retroperitoneal asociado a un síndrome de compresión u obstrucción de vena cava inferior y se comprobó imagenológicamente. La confirmación histológica se obtuvo por vía quirúrgica.We studied a 57 year-old patient of black complexion, with swelling of the lower limbs which was relevant due to its mass and extension. The clinical discussion guided us to search for a lesion or retroperitoneal tumor associated with a compression syndrome or obstruction of the inferior vena cava, which was determined radiologically. Histological confirmation was obtained through surgery.

Alberto Miranda Bravo

2010-09-01

272

Effect of sodium hypochlorite and edta irrigation, individually and in alternation, on dentin microhardness at the furcation area of mandibular molars  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese A proposta desse estudo foi avaliar o efeito do NaOCl 1% e do ácido etilenodiaminotetracético 17% (EDTA), de forma isolada e alternada, sobre a microdureza dentinária da região da furca de molares inferiores. A superfície oclusal e as raízes de vinte molares inferiores, recém extraídos, foram cortad [...] as transversalmente e descartadas. Os espécimes foram distribuídos em 4 grupos (n=5) de acordo com a solução irrigante utilizada. As soluções empregadas foram EDTA 17% (I), NaOCl 1% (II), NaOCl 1% e EDTA 17% (III), e água destilada (IV) (controle). Os dentes foram incluídos em blocos de resina acrílica e cortados transversalmente. A hemi-secção que melhor representou a furca dental foi lixada e polida para a avaliação da microdureza Knoop. As medidas obtidas foram analisadas utilizando-se teste ANOVA seguido do teste de comparação múltipla de Tukey (?=0,05). Os resultados desse estudo mostraram que todas as soluções, exceto o grupo controle, diminuíram a microdureza dentinária. O EDTA não apresentou diferença estatística significante em relação ao NaOCl/EDTA (p>0,05), mas foi diferente do NaOCl (p Abstract in english The aim of this study was to evaluate the effect of irrigation regimens on dentin microhardness at the furcation area of mandibular molars, using sodium hypochlorite and ethylenediaminetetraacetic acid (EDTA), individually and in alternation. The occlusal surface and the roots of 20 non-carious extr [...] acted human permanent mandibular molars were cut transversally and discarded. The tooth blocks were embedded in acrylic resin and randomly assigned to 4 groups (n=5) according to the irrigating regimens: 1% NaOCl solution, 17% EDTA solution, 1% NaOCl and 17% EDTA and distilled water (control). Knoop microhardness of dentin at the furcation area was evaluated. Data were analyzed using one-way ANOVA and Tukey's multiple comparison tests (?=0.05). The results of this study indicated that all irrigation solutions, except for distilled water (control), decreased dentin microhardness. EDTA did not show a significant difference with NaOCl/EDTA (p>0.05), but showed a significant difference with NaOCl (p

Danilo, Zaparolli; Paulo César, Saquy; Antonio Miranda, Cruz-Filho.

273

Congenital intrahepatic portosystemic shunt with variant inferior right hepatic vein.  

Science.gov (United States)

We present a case of congenital intrahepatic aneurysmal portosystemic shunt in which the right portal vein communicates with both a variant inferior right hepatic vein and the right hepatic vein. We also describe the importance and efficacy of three dimensional computed tomography reconstruction images in determining subtle, small shunt vessels. PMID:18553284

Senocak, Efsun; O?uz, Berna; Edgüer, Tahsin; Cila, Ay?enur

2008-06-01

274

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

275

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

276

Magnetic resonance venography of double inferior vena cava.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

ABSTRACT Duplication of the inferior vena cava IVC is the most common anomaly affecting the vena cava. Variations of the IVC are diagnosed in routine dissection studies, in retroperitoneal surgeries, or in radiological studies for various reasons. In this paper, we present a case of double IVC with its magnetic resonance imaging findings.

Ilkan Tatar; Tore, Huseyin G.; Celik, Hakan H.; Musturay Karcaaltincaba

2005-01-01

277

Entrapment of venous catheter following inferior vena caval spasm.  

Science.gov (United States)

This is a report of a case in which a 5F high-flow right coronary catheter with its guide wire was entrapped within the inferior vena cava following a venous spasm. Local infusion of nitroglycerin (NTG) relieved the spasm, and the guidewire-catheter assembly could be safely retrieved. PMID:2504494

Dalvi, B V; Gupta, K G; Munsi, S C; Vengsarkar, A S

1989-07-01

278

Leiomyosarcoma of inferior vena cava - a case report  

International Nuclear Information System (INIS)

The previously diagnosis of vena cava inferior tumors has a great importance in the prognosis. The present report is about a 36-year-old woman who has an abdominal mass to be confirmed. The aspects observed in the ultrasonography and computed tomography are shown. The reviewed literature on the subject is also discussed. (author)

279

Relationship of cervical spinal rootlets and the inferior vertebral notch.  

Science.gov (United States)

The anatomic features of cervical spinal rootlets from C5 to T1 and their relationships to the inferior vertebral notches were studied. Fifteen fresh cadavers were dissected and the cervical spinal cord and spinal rootlets were exposed by posterior total laminectomy. The dorsal rootlet entry zone of each spinal root was located proximal to the inferior vertebral notch, with an increasing distance from 15 mm at C5 to 28 mm at T1. The angle sustained by the rootlets to the cord decreased from 45 degrees to 89 degrees at C5 and to 23 degrees to 41 degrees at T1. Ventral rootlet exit zones shared similar arrangements and orientations, but they could not be exposed with posterior laminectomy only. Spinal rootlets of a particular cervical spinal segment may be found medial to the pedicles or through the intervertebral foramen one level above. They may be exposed by foraminotomy or partial excision of the pedicles. The inferior vertebral notch, which is the inferior border of the pedicle, is a reliable landmark for location of the rootlets. The information is useful for safe surgical manipulation and instrumentation around the pedicles, and when reimplantation of spinal nerve roots is considered for total brachial palsy. PMID:12671495

Hung, Leung Kim; Zhao, Xin

2003-04-01

280

Renal Angiomyolipoma Associated with Inferior Vena Cava Thrombus  

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A 57-year-old woman was found to have an inferior vena cava involvement of a known sinusal angiomyolipoma incompletely resected three years beforehand. Intravascular extension into the IVC of angiomyolipoma has rarely been reported. We present a new case and reconsider the literature about this uncommon complication of a benign renal tumor.

Francois Richard; Raphaelle Renard-Penna; Marc-Olivier Bitker; Eva Comperat; Xavier Durand

2009-01-01

 
 
 
 
281

Estratigrafia del Cretacico inferior continental de la Cordillera Iberica Central  

Digital Repository Infrastructure Vision for European Research (DRIVER)

El Cretácico inferior continental de la Cordillera Ibérica Central está representado en dos subcuencas de sedimentación: las Cubetas de Aguilón y Oliete. Los estudios realizados sobre estos materiales han permitido definir nuevas unidades litoestratigráficas, cuya caracterización bioestratigráfica se realiza a partir de su contenido en carofitas. La identificación de discontinuidades significativas permiten definir tres secuencias de depósito que abarca en el intervalo temporal Vala...

Soria Miguel, Ana Rosa; Marti?n-closas, Carles; Mele?ndez Hevia, Alfonso; Mele?ndez, M. Nieves; Aurell, Marc

1995-01-01

282

Superior and Inferior Ophthalmic Veins Thrombosis with Cavernous Sinus Meningioma  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Ophthalmic vein thrombosis is an extremely rare entity. We present a case of middle-aged female who presented with proptosis. Contrast-enhanced computed tomography and magnetic resonance imaging showed cavernous sinus meningioma with ipsilateral superior and inferior vein thrombosis. A brief review of the vascular involvement of the meningioma and ophthalmic vein thrombosis is presented along with the case.

Vyas, Sameer; Das, Palash Jyoti; Gupta, Sunil Kumar; Kakkar, Nandita; Khandelwal, Niranjan

2011-01-01

283

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

284

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

285

Molar extinction coefficients of solutions of some organic compounds  

Science.gov (United States)

Molar extinction coefficients of aqueous solutions of some organic compounds, viz. formamide (CH_{3}NO), N-methylformamide (C_{2}H_{5}NO), NN-dimethylformamide (C_{3}H_{7}NO), NN-dimethylacetamide (C_{4}H_{9}NO), 1,4-dioxane (C_{4}H_{8}O_{2}), succinimide (C_{4}H_{5}NO_{2}) and solutions of acetamide (C_{2}H_{5}NO) and benzoic acid (C_{7}H_{6}O_{2}) in 1,4-dioxane (C_{4}H_{8}O_{2}) have been determined by narrow beam gamma-ray transmission method at 81, 356, 511, 662, 1173 and 1332 keV. The experimental values of mass attenuation coefficients of these compounds have been used to calculate effective atomic numbers and electron densities. The additivity rule earlier used for aqueous solution has been extended to non-aqueous (1,4-dioxane) solutions.

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

2004-05-01

286

Physicochemical characterization of irradiated high molar mass chitosan  

International Nuclear Information System (INIS)

The present study is aimed to determination of the bio burden for assessing the sterilization dose and to identify the influence of the absorbed dose of gamma radiation on the molar mass and chemical structure of chitosan. The characterization includes the determination of the intrinsic viscosity, deacetylation degree as well as infrared spectrometry. The obtained results have been shown chain cleavage caused by irradiation. It was revealed by a decrease in the intrinsic viscosities of the polymers. The invariance of the infrared spectra of polymers indicated that chain degradation occurs without significant change of the chemical structure. The results obtained have practical implication in the field of radiation sterilization of chitosan used for microencapsulation of mammalian cells

287

Evaluation of individual ionic partial molar volumes in aqueous solutions  

International Nuclear Information System (INIS)

In a recent H2O-D2O molar volume isotope effect study on the alkali metal halide solutions, individual ionic standard partial molar volume contributions (V-barion0(H2O)-V-barion0(D2O)=?V-barion0(H-D)) have been derived, dependent only on the chosen (Pauling) ionic radii, rion. It has been concluded that the isotope effect of the cations (except for Li+) and that of the chloride anion exhibit a linear function of 1/rion, with ?V-barion0(H-D) vanishing when 1/rion approaches zero. On the other hand, the directly measurable hydrodynamic 'cosphere' volumes of the ions, V-barcosph0, derived from the kinetic ionic (Stokes) radii, show a similar pattern, here also the cationic and anionic rion relations cross or meet at V-barcosph0(Cs+)?V-barcosph0(Cl-). Because both ?V-barion0(H-D)andV-barcosph0 originate in the hydration volumes of the ions, (V-barhydr0=V-barion0-V-barintr0) determined by electrostriction, this rion pattern of the V-barhydr0 (ion) provides an 'extra-thermodynamic' assumption to evaluate the individual cationic and anionic molar volume contriionic and anionic molar volume contributions in normal water solution. As a basis for the evaluation, this rion pattern is applied to the conventional cationic and anionic V-barhydr0 (ion) values (related toV-barion0(H+,aq.)=0cm3.mol-1), calculated from literature V-barion0 data, assuming that the V-barintr0 (ion) = V-barcryst0 (ion). To adjust the V-barhydr0(Cl-) to the V-barhydr0(Na+,K+,Rb+,Cs+)versus rion relation at T = 298.15 K, the conventional anionic V-barhydr0 (ion) data have to be increased, the cations have to be decreased by 4.2 cm3 . mol-1. Similar adjustments at five different temperatures between T = (273 and 323) K, result in V-barion0(H+,aq.)=-(4.2±0.2)cm3.mol-1 at T = 298.15 K, with an increment of -0.02 cm3 . K-1 . mol-1. Related to these parameters, relations of V-barion0versus temperature for the alkali metal and halide ions were calculated. The cationic and anionic V-barhydr0 (ion) values, when related to V-barion0(H+,aq.)=-4.2cm3.mol-1, show strong rion correlation with V-barcosph0, their ratio versus rion offers a linear equation to compare the influence of the ions on the solvent structure on a well defined 'quantitative' scale. The value of the derived V-barion0(H+,aq.), while being consistent with that widely accepted ca. - (5 ± 2) cm3 . mol-1, has a higher precision with a reasonable basis of the applied 'extra-thermodynamic' assumption. It can serve to verify other partitioning procedures used in non-aqueous solvents

288

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

289

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

290

Standard molar enthalpies of formation of hydroxy-, chlor-, and bromapatite  

Energy Technology Data Exchange (ETDEWEB)

The standard (p{sup 0} =0.1MPa) molar enthalpies of formation in the crystalline state of hydroxyapatite, chlorapatite and a preliminary value for bromapatite, at T=298.15K, were determined by reaction-solution calorimetry as: {delta}{sub f}H{sub m}{sup 0} [Ca{sub 10}(PO{sub 4}){sub 6}(OH){sub 2},cr]=-(13399+/-11)kJ.mol{sup -1},{delta}{sub f}H{sub m}{sup 0} [Ca{sub 10}(PO{sub 4}){sub 6}Cl{sub 2},cr]=-(13231+/-82)kJ.mol{sup -1},and{delta}{sub f}H{sub m}{sup 0} [Ca{sub 10}(PO{sub 4}){sub 6}Br{sub 2},cr]=-(13063+/-81)kJ.mol{sup -1}. A critical assessment of these results and of previously published data is made. Finally, the standard molar enthalpy of formation of iodapatite is estimated as {delta}{sub f}H{sub m}{sup 0} [Ca{sub 10}(PO{sub 4}){sub 6}I{sub 2},cr]=-12949kJ.mol{sup -1}, from a linear correlation of {delta}{sub f}H{sub m}{sup 0} [Ca{sub 10}(PO{sub 4}){sub 6}X{sub 2},cr] (X=OH, F, Cl, Br) against the corresponding {delta}{sub f}H{sub m}{sup 0} [CaX{sub 2},cr].

Cruz, Fernando J.A.L. [Centro de Quimica Estrutural, Complexo Interdisciplinar, Instituto Superior Tecnico 1049-001 Lisbon (Portugal); Minas da Piedade, Manuel E. [Departamento de Quimica e Bioquimica, Faculdade de Ciencias, Universidade de Lisboa, 1749-016 Lisbon (Portugal); Calado, Jorge C.G. [Centro de Quimica Estrutural, Complexo Interdisciplinar, Instituto Superior Tecnico 1049-001 Lisbon (Portugal)]. E-mail: jcalado@ist.utl.pt

2005-10-15

291

Biometric study of furcation area of first maxillary molars  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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.

292

Comparison of two needle models in terms of bevel deformation during truncal block of the inferior alveolar nerve  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: English Abstract in spanish Objetivos: Evaluar las posibles diferencias existentes en cuanto a la deformación del bisel de dos tipos de aguja de igual longitud y calibre externo, pero de distinto diámetro interno, durante el bloqueo troncal del nervio dentario inferior. Diseño del estudio: Cuatro operadores de similar formació [...] n quirúrgica realizaron el bloqueo troncal del nervio dentario inferior y la anestesia infiltrativa del nervio bucal para proceder a la extracción quirúrgica o convencional del tercer molar inferior en 266 pacientes. Para efectuar el bloqueo troncal se utilizó en todos los casos un sistema de jeringa no auto-aspirante (Uniject K®; Hoechst AG, Frankfurt, Alemania) y dos tipos de aguja: una aguja Monoprotect® de 27G x 35 mm con un calibre interno de 0.215 mm (Sofic SA, Mazamet, Francia) o una aguja XL Monoprotect® de 27G x 35 mm con un calibre interno de 0.265 mm (Sofic SA, Mazamet, Francia). Para hacer la anestesia infiltrativa del nervio bucal se utilizó el mismo tipo de jeringa y otros dos tipos de aguja: la Monoprotect®o la XL Monoprotect®, ambas con un calibre de 30G y 25 mm de longitud, diferenciándose en su calibre interno (0.215 y 0.265 mm, respectivamente) (Sofic SA, Mazamet, Francia). En cada paciente fue recopilada de forma sistemática la siguiente información: el tipo de aguja, la técnica anestésica utilizada (troncular directa o indirecta) y el número de veces que se había contactado con el hueso durante ésta, el lado de trabajo del operador, el lado del diente a extraer, el operador que hizo la intervención quirúrgica, así como la presencia o ausencia de deformación del bisel tras la técnica anestésica. Resultados: Para la técnica troncular, sólo se observó una asociación estadísticamente significativa entre la deformación de los biseles de las agujas y el operador que efectuó la técnica anestésica, mientras que para la técnica infiltrativa, se encontró una asociación estadísticamente significativa (p Abstract in english Objectives: To evaluate the differences in terms of bevel deformation between two types of needle of the same length and external caliber, but with different internal diameters, during truncal block of the inferior alveolar nerve. Study design: Four operators performed truncal block of the inferior [...] alveolar nerve and infiltrating anesthesia of the buccal nerve for the extraction of a lower third molar in 266 patients. The truncal block was carried out using a standard 27G x 35 mm needle with an internal caliber of 0.215 mm, or a 27G x 35 mm XL Monoprotect® needle with an internal caliber of 0.265 mm. The infiltrating anesthesia was made with a Monoprotect® or XL Monoprotect® needle, both with a caliber of 30G and a length of 25 mm, but with different internal calibers (0.215 and 0.265 mm, respectively). The type of needle used, the anesthetic technique and the number of bone contacts was established during the procedure, the operator working side, the side of the tooth to be removed, the operator in charge of the intervention and the presence of bevel deformation after the anesthetic technique were collected for each patient. Results: A statistically significant association was observed between bevel deformation and the operator performing the truncal block, while a statistically significant association (p

Nieves, Almendros Marqués; Esther, Delgado Molina; Meritxell, Tamarit Borrás; Leonardo, Berini Aytés; Cosme, Gay Escoda.

2007-08-01

293

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

294

Geometric morphometric 3D shape analysis and covariation of human mandibular and maxillary first molars.  

Science.gov (United States)

Dental casts of 160 Greek subjects (80 males, 80 females) were scanned by a structured-light scanner. The upper and lower right first molar occlusal surface 3D meshes were processed using geometric morphometric methods. A total of 265 and 274 curve and surface sliding semilandmarks were placed on the upper and lower molar surfaces, respectively. Principal component analysis and partial least square analysis were performed to assess shape parameters. Molars tended to vary between an elongated and a more square form. The first two principal components (PCs), comprising almost 1/3 of molar shape variation, were related to mesiodistal-buccolingual ratios and relative cusp position. Distal cusps displayed the greatest shape variability. Molars of males were larger than those of females (2.8 and 3.2% for upper and lower molars respectively), but no shape dimorphism was observed. Upper and lower molar sizes were significantly correlated (r(2) = 0.689). Allometry was observed for both teeth. Larger lower molars were associated with shorter cusps, expansion of the distal cusp, and constriction of the mesial cusps (predicted variance 3.25%). Upper molars displayed weaker allometry (predicted variance 1.59%). Upper and lower molar shape covariation proved significant (RV = 17.26%, P parameter of molar covariation in partial least square axis 1, contributing to 30% of total covariation, was cusp height, in contrast to the primary variability traits exhibited by PC1 and PC2. The aim of this study was to evaluate shape variation and covariation, including allometry and sexual dimorphism, of maxillary and mandibular first permanent molar occlusal surfaces. PMID:24009105

Polychronis, Georgios; Christou, Panagiotis; Mavragani, Maria; Halazonetis, Demetrios J

2013-10-01

295

Management of mandibular first molar with four canals in mesial root  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Successful root canal treatment depends on adequate cleaning, shaping, and filling of the root canal system. The presence of middle mesial (MM) root canal of mandibular molars has been reported by various authors. But incidence of four canals in mesial root of mandibular molar is very rare. The aim of this case report is to present and describe the identification and management of a mandibular first molar with four canals in the mesial root and single canal in the distal root.

Subbiya, Arunajatesan; Kumar, Krishnamurthy Sathish; Vivekanandhan, Paramasivam; Prakash, Venkatachalam

2013-01-01

296

Direct Pulp-Capping with Calcium Enriched Mixture in Primary Molar Teeth: A Randomized Clinical Trial  

Digital Repository Infrastructure Vision for European Research (DRIVER)

INTRODUCTION: The aim of this trial was to compare clinical and radiographic success rates of direct pulp capping (DPC) using a novel biomaterial called Calcium Enriched Mixture (CEM) cement versus Mineral Trioxide Aggregate (MTA) in primary molar teeth. MATERIALS AND METHODS: In this randomized clinical trial 42 deciduous molars in 21 patients who had at least two teeth requiring DPC, were treated. The enrolled patients were between 5-8 years. The molar teeth were randomly divided into two e...

Masoud Fallahinejad Ghajari; Tahereh Asgharian Jeddi; Sonay Iri; Saeed Asgary

2010-01-01

297

Three-dimensional molar enamel distribution and thickness in Australopithecus and Paranthropus  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Thick molar enamel is among the few diagnostic characters of hominins which are measurable in fossil specimens. Despite a long history of study and characterization of Paranthropus molars as relatively ‘hyper-thick’, only a few tooth fragments and controlled planes of section (designed to be proxies of whole-crown thickness) have been measured. Here, we measure molar enamel thickness in Australopithecus africanus and Paranthropus robustus using accurate microtomographic methods, recording...

Olejniczak, A. J.; Smith, T. M.; Skinner, M. M.; Grine, F. E.; Feeney, R. N. M.; Thackeray, J. F.; Hublin, J. -j

2008-01-01

298

Molar Tooth Structures in Calcareous Nodules, Early Neoproterozoic Burovaya Formation, Turukhansk Region, Siberia  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Molar tooth structures are abundant in large (1-2 m diameter) carbonate nodules within fine-grained, subtidal carbonates of the early Neoproterozoic (lower Upper Riphean) Burovaya Formation along the Sukhaya Tunguska River, Turukhansk Uplift, northwestern Siberia. Although molar tooth structures are regionally abundant in this unit, here they occur only within the nodules. Stable isotopic compositions of molar-tooth-filling dolomicrospar cements and of thinly bedded dolomicrite within and sur...

Knoll, Andrew; Pope, Michael C.; Bartley, Julie K.; Petrov, Peter Yu

2003-01-01

299

Hypohyperdontia: Agenesis of three third molars and mandibular centrals associated with midline supernumerary tooth in mandible  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Agenesis of teeth in a patient who also presents with a supernumerary tooth is one of the rare numerical anomalies in human dentition. Agenesis of third molars was shown to be associated with other missing permanent teeth. A review of literature on hypodontia including third molar agenesis, hyperdontia and a concomitant presence of these two conditions which is termed as hypohyperdontia is presented along with a case showing agenesis of three third molars, both mandibular central incisors and...

Nuvvula, Sivakumar; Kiranmayi, M.; Shilpa, G.; Nirmala, S. V. S. G.

2010-01-01

300

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

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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

 
 
 
 
301

Containing the cost of third-molar extractions: a dilemma for health insurance.  

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No known scientific studies support the extraction of third molars (wisdom teeth) to prevent future disease. Yet, third-molar surgery for this purpose has become so common that in at least one major U.S. health insurance plan, the cumulative cost exceeds that for every other kind of major surgery. Many third molars that are developing normally in adolescents are classified as impacted and removed before they erupt, a practice that results in large expenditures for unnecessary surgery. In addi...

Friedman, J. W.

1983-01-01

302

Intrusion of overerupted maxillary molars with miniscrew implant anchorage: a radiographic evaluation.  

Science.gov (United States)

The aim of this retrospective study was to quantitatively evaluate the treatment effects of intrusion of overerupted maxillary molars using miniscrew implant anchorage and to investigate the apical root resorption after molar intrusion. The subjects included 30 patients whose average ages were 35.5±9.0 years. All patients had received intrusion treatments for overerupted maxillary molars with miniscrew anchorage. There were 38 maxillary first molars and 26 maxillary second molars to be intruded. Two miniscrews were inserted in the buccal and palatal alveolar bone mesial to the overerupted molar. Force of 100-150 g was applied by the elastic chains between screw head and attachment on each side. Lateral cephalograms and panoramic radiographs taken before and after intrusion were used to evaluate dental changes and root resorption of molars. Only 6 of the 128 miniscrews failed. The first and second molars were significantly intruded by averages of 3.4 mm and 3.1 mm respectively (Pprosthesis. Radiographically speaking, root resorption of molars was not clinically significant after application of intrusive forces of 200 to 300 g. PMID:24142737

Xun, Chun-lei; Zhao, Hong; Zeng, Xiang-long; Wang, Xing

2013-10-01

303

Mandibular permanent second molar with four roots and root canals: a case report.  

Science.gov (United States)

Although four-rooted mandibular first molars have been observed on a few occasions in the literature, to the best of our knowledge, four-rooted second molars have not been reported. Here, we describe a mandibular second molar with four roots and canals: two mesial and two distal. Mesial roots were separated in the cervical one-third near the cervical margin, while distal roots were divided at a lower level in the middle one-third of the root. We discuss the possibility of different root and canal variations of the mandibular second molar from a developmental point of view. PMID:19184298

Peiris, Roshan; Pitakotuwage, Nilmini; Takahashi, Masami; Ohzeki, Saori; Nakayama, Mitsuko; Sakurai, Shigeru; Igarashi, Yuriko; Matsuno, Masanobu; Sasaki, Kayoko; Satake, Takashi; Kanazawa, Eisaku

2009-01-01

304

Orthodontic uprighting of impacted mandibular permanent second molar: A case report  

Directory of Open Access Journals (Sweden)

Full Text Available The mandibular second molars can become impacted beneath the crown of the first molars due to various causes and fail to erupt normally. Presented herewith is a case report of orthodontic uprighting of a mesioangular impacted mandibular right permanent second molar. Though various treatment options were available, an uprighting push spring appliance was used as it is easy to fabricate and produces distal tipping and uprighting of the impacted tooth without the necessity of surgical assistance, bone removal, or splinting. The uprighting of the mandibular second molar was achieved within two months.

Reddy S

2008-03-01

305

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

306

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 | Language: English 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

307

Agenesia de Terceros Molares, Prevalencia, Distribución y Asociación con otras Anomalías Dentales / Third Molar Agenesis, Prevalence, Distribution and Association with Other Dental Anomalies  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: Spanish Abstract in spanish La agenesia de terceros molares se ha reportado en un 24,3% en México. La agenesia dental está asociada a otras anomalías dentales debido a su origen genético. El objetivo del presente estudio fue determinar la prevalencia y distribución de agenesia de terceros molares así como establecer su asociac [...] ión con otras anomalías dentales en una población ortodóntica. La muestra incluyó 670 pacientes ortodónticos de 9 a 20 años de edad. Se excluyeron pacientes con tratamiento ortodóntico previo y condiciones sindrómicas. Se calculó la prevalencia de agenesia de terceros molares y se comparó por sexo. Posteriormente los pacientes fueron divididos en 2 grupos, con agenesia de al menos un tercer molar y un grupo control y en ambos se calculó la prevalencia de 10 anomalías dentarias. Los resultados se compararon por medio de la prueba exacta de Fisher (p Abstract in english Prevalence of third molar agenesis has been estimated in 24.3% in Mexico. Dental agenesis is associated with other dental anomalies due its genetic origin. The aim of this study was to determine the prevalence and distribution of third molar agenesis and to establish its association with other denta [...] l anomalies in an orthodontic population. The sample included 670 orthodontic patients from 9 to 20 years old. Exclusion criteria were patients with previous orthodontic treatment and syndromic conditions. Third molar agenesis prevalence was calculated and sex values were compared. Then, patients were divided into 2 groups, with agenesis of at least one third molar and a control group; prevalence of 10 dental anomalies were calculated for both groups. The results were compared using Fisher's exact test (p

José Rubén, Herrera-Atoche; Gabriel Eduardo, Colomé-Ruiz; Mauricio, Escoffié-Ramírez.

1371-13-01

308

Origin of Inferior Phrenic Arteries in the Celiac Trunk Origen de las Arterias Frénicas Inferiores en el Tronco Celíaco  

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Full Text Available The knowledge of the arterial anatomic variations is very important for the clinical, radiological and surgical diagnosis. Regarding inferior phrenic arteries, which irrigate the diaphragm, it is known that they vary in relation to their origin. The purpose of the present study is to verify these variations. The abdominal cavity of eighty-nine adult cadavers of both sexes was dissected, of which 69 fixed in 10% formalin solution and 20 non-fixed. The fixed cadavers were dissected in Laboratories of Anatomy of the Federal University of São Paulo (UNIFESP-EPM, the Santo Amaro University (UNISA and Lusiadas de Santos University (UNILUS. The non-fixed cadavers were dissected from the Death Verification Service of the city of São Paulo (USP and from the UNIFESP Brazil. After exposure of the celiac axis, we analyzed the possible emission of inferior phrenic arteries from this vessel as well as site of origin. The results showed us the presence of inferior phrenic arteries in 31 (34.83% among the 89 cadavers. In the remained 58 (65.17%, the celiac trunkhad not these branches. It was observed that in 19 (21.35% out of the 89 cadavers the inferior phrenic artery originating at the left contour of the celiac axis, in five (5.62% cadavers, the phrenic artery presented its origin at the right contour and seven (7.86% presented two phrenic arteries of which five were independently originated from each side of the celiac trunk and two (2.25% from one axisEl conocimiento de las variaciones anatómicas arteriales es de gran importancia para los diagnósticos clínico, radiológico y quirúrgico. Con relación a las arterias frénicas inferiores que irrigan el diafragma, se tiene conocimiento que éstas presentan variaciones referentes a su origen. Disecamos la cavidad abdominal de 89 cadáveres adultos de ambos sexos, de los cuales 69 fueron fijados en solución de formalina a 10%, y 20 no fijados. Los cadáveres fijados fueron disecados en los laboratorios de Anatomía de la Universidad Federal de São Paulo-UNIFESP, en la Universidad de Santo Amaro-UNISA, y en la Universidad Lusíadas de Santos, UNILUS. Los cadáveres no fijados fueron disecados en los Servicios de Verificación de Óbitos de la capital (USP y UNIFESP, Brasil. Se verificó la emisión de arterias frénicas inferiores a partir del tronco celíaco y el lugar de origen de éstas. Los resultados obtenidos indicaron la presencia de arterias frénicas inferiores en 31 (34.83% de los 89 cadáveres. En los otros 58 (65.17% el tronco celíaco no emitió tal ramo. También se verificó en 19 (21.35% de los 89 cadáveres, la arteria frénica inferior con origen en el contorno izquierdo del tronco celíaco, en 5 (5.62% ésta presentaba su origen en el contorno derecho y en 7 (7.86% emitía dos arterias frénicas, mientras que 5 de éstas se originaban separadamente de cada lado del tronco celíaco y 2 (2.25% de un único tronco. Estos resultados permiten considerar el origen de las arterias frénicas inferiores en el tronco celíaco como una variación anatómica

Selma Petrella

2006-06-01

309

Evaluation of telemedicine systems for impacted third molars diagnosis  

Directory of Open Access Journals (Sweden)

Full Text Available Background/Aim. In the last twenty years significant advances have been made in the fields of information and telecommunication technology in health care applications, with a positive impact on the health care practice. The need for remote diagnosis and planning of interventions is of special importance in military health care, and health management of immobile persons, and those with special needs. In cases such as these, availability of specialist health care is mainly limited by geographic and financial factors. The aim of this study was to investigate practical usability of telemedicine approaches in everyday management of oral surgery patients in terms of reliability of established diagnosis and indications for oral surgery treatment of the third molars. Methods. Our experimental randomized study enrolled 432 randomly selected patients of both genders, aged 20 to 87 years, undergoing panoramic radiography for some reason in the Centre for Dental Radiography in Belgrade. In addition to radiography, photographs of the face and mouth cavity were taken. These images were uploaded to the web server specially dedicated to the study purposes, and then transmitted to teledentists, i.e. oral surgeons, who made remote diagnoses. Diagnostic agreement was determined by way of the Cohen's kappa coefficient, and diagnostic sensitivity (SE, specificity (SP, and effectiveness (EFF were also established. Statistical significance was determined and comparisons performed by using the z-test, and testing of non-parametric characteristics by using the McNemar's ?2 test for p = 0.05 significance cut-off. Results. The results obtained by analyzed images and diagnostic assessment of the clinical diagnosis (kappa = 0.99, SE = 99%, SP = 99%, EFF = 99%, for 95% CI indicate an almost complete diagnostic agreement. The differences in diagnosis were not statistically significant. Conclusion. Diagnostic assessment of the clinical diagnosis of impacted or semi-impacted third molars assisted by the telemedicine approach was equal to the real-time assessment of clinical diagnosis. Telemedicine, and teledentistry as its branch, represent the present and even more the future of this field of health care.

Duka Miloš

2009-01-01

310

Comparison of panoramic radiography with cone beam CT in predicting the relationship of the mandibular third molar roots to the alveolar canal  

Energy Technology Data Exchange (ETDEWEB)

Preoperative radiographic assessment of the mandibular third molars is essential to prevent inferior alveolar nerve damage during extraction. The purpose of this study was to assess the reliability of panoramic signs of association between the roots of teeth and the canal, and to compare the panoramic signs with cone beam computed tomography (CBCT) findings. CBCT images of 132 impacted mandibular third molars were evaluated to determine the association of the root to the canal. The CBCT findings were compared with the corresponding panoramic images. Logistic regression analysis was used to define the diagnostic criteria of the panoramic images. Among the panoramic signs, loss of the cortical line was the most frequent radiographic sign predicting association (sensitivity: 79.31). Contact of the tooth with the canal was observed in all cases in which the loss of cortical line of the canal or darkening of the roots was found on the panoramic radiographs. Darkening of the roots and loss of the cortical line on panoramic radiographs might be highly suggestive of the risk of nerve injury.

Shahidi, Shoaleh; Zamiri, Barbod; Bronoosh, Pegah [School of Dentistry, Shiraz University of Medical Sciences, Shiraz (Iran, Islamic Republic of)

2013-06-15

311

Appearance of dentin gamma-carboxyglutamic acid-containing proteins in developing rat molars in vitro  

International Nuclear Information System (INIS)

An in vitro model of mineralization was devised in order to study the developmental appearance of dentin gamma-carboxyglutamic acid-containing proteins (DGPs) in relation to the onset of mineralization. Maxillary third molars from 11-day-old rats were cultured with or without fetal calf serum (FCS) as modified from Navia et al. Molars were incubated without radiolabel, or with either 45CaCl2 (5 microCi/ml) for 24 hr at various stages of a ten-day culture period or [3H]-leucine (10 microCi/ml) for 24 hr at the eighth day of culture. Molars were lyophilized and extracted with 10% formic acid overnight at 4 degrees C. DGPs in extracts were detected by immunologic and chromatographic techniques; DGPs in molar sections were detected by immunolocalization using indirect immunofluorescence. Molar development was evaluated histologically using the Von Kossa staining technique. Molars cultured with FCS showed histologic evidence for mineralized dentin and enamel and a significant increase in 45Ca uptake after the sixth day in vitro. Eleven-day-old molars in vivo and molars cultured without FCS showed no evidence of the presence of mineralized tissues. [3H]-Leucine-labeled DGPs were isolated and identified by affinity and reversed-phase high-performance liquid chromatography and by gel electrophoresis from both mineralized and unmineralized molars. DGP antigens were localized immunohistochemically using rabbit anti-rat antihistochemically using rabbit anti-rat antibodies raised against a highly purified DGP preparation. In the unmineralized molar, antigenicity was seen in odontoblasts but not in predentin matrix, preodontoblasts, or in any other cell type. Antigens in the mineralized molar were localized to odontoblasts and dentin

312

Venous Thromboembolism After Removal of Retrievable Inferior Vena Cava Filters  

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The purpose of this study was to examine the incidence of new or recurrent venous thromboembolism (VTE) after retrieval of inferior vena cava (IVC) filters and risk factors associated with such recurrence. Between March 2001 and September 2008, at our institution, implanted retrievable vena cava filters were retrieved in 76 patients. The incidence of new or recurrent VTE after retrieval was reviewed and numerous variables were analyzed to assess risk factors for redevelopment of VTE after fil...

Yamagami, Takuji; Tanaka, Osamu; Yoshimatsu, Rika; Miura, Hiroshi; Nishimura, Tsunehiko

2010-01-01

313

Cortical Columnar Organization Is Reconsidered in Inferior Temporal Cortex  

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The object selectivity of nearby cells in inferior temporal (IT) cortex is often different. To elucidate the relationship between columnar organization in IT cortex and the variability among neurons with respect to object selectivity, we used optical imaging technique to locate columnar regions (activity spots) and systematically compared object selectivity of individual neurons within and across the spots. The object selectivity of a given cell in a spot was similar to that of the averaged c...

Sato, Takayuki; Uchida, Go; Tanifuji, Manabu

2008-01-01

314

[A complication of inferior dental nerve block: temporary ocular palsy].  

Science.gov (United States)

An interesting case of temporary ocular palsy, a complication of inferior dental nerve block was reported. Symptom, sign and proper management were described. Several updated literatures on this topic were reviewed and concluded that this complication might be explained by accidental intra-arterial injection of anesthetic solution. To prevent this serious complication, aspirating before each injection by an aspirated syringe was strongly recommended. PMID:2635191

Hotrabhavanond, P; Meksupa, L

1989-01-01

315

Cauterização química das conchas nasais inferiores com ácido tricloroacético  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Introdução: Obstrução nasal crônica secundária a hipertrofia das conchas nasais inferiores é um sintoma comum, de importante morbidade em nosso meio. Várias técnicas cirúrgicas são descritas para os casos refratários aos tratamentos clínicos, porém, há controversas sobre qual delas é a mais efetiva e sujeita a menos complicações. Objetivo: Avaliar a eficácia, a segurança e exequibilidade do uso do ácido tricloroacético ambulatorial para o tratamento da hipertrofia dos co...

Azevedo, Alexandre Fernandes; Martins, Da?rio Antunes; Cardoso, Caroline Guimara?es; Moraes, Itamar Fernando Ca?ndido; Michel, Luciane Maria Pereira; Leite, Laura Hora Rios

2011-01-01

316

Anesthetic technique for inferior alveolar nerve block: a new approach  

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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 region. 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. D...

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

2011-01-01

317

A Case Report: Bilateral Posterior Inferior Cerebellar Artery Infarct  

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The most frequent type of cerebellar infarcts involves the posterior inferior cerebellar artery (PICA) and superior cerebellar artery territories. Bilateral symettrical cerebellar infarcts are extremely rare. The etiology of this infarct pattern has not been shown clearly. It is postulated that bilateral PICA infarcts are caused by the stenosis of PICA which emerges from the left vertebral artery that supplies the blood for both cerebellar hemispheres. A 42-year old male patient came with com...

Nurten Çolak; I??l Kalyoncu Aslan; Göksel Bakaç; Dursun K?rbas

2004-01-01

318

Surgical treatment for ruptured anterior inferior cerebellar artery aneurysms  

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Background Anterior inferior cerebellar artery (AICA) aneurysm is an extremely raretumor, which can cause severe results after ruptured. This article retrospectively analyzed the clinical symptoms, imaging manifestations, surgical approaches, endovascular therapy and postoperative outcomes of 12 cases with AICA aneurysms, so as to provide reference for clinical practice. Methods Clinical data of patients with AICA aneurysms, who were treated in our hospital between June 2004 and June 2012, ...

Tong, Xiao-guang; Gao, Kai-ming

2013-01-01

319

Somatomotor and oculomotor inferior olivary neurons have distinct electrophysiological phenotypes  

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The electrophysiological properties of rat inferior olive (IO) neurons in the dorsal cap of Kooy (DCK) and the adjacent ventrolateral outgrowth (VLO) were compared with those of IO neurons in the principal olive (PO). Whereas DCK/VLO neurons are involved in eye movement control via their climbing fiber projection to the cerebellar flocculus, PO neurons control limb and digit movements via their climbing fiber projection to the lateral cerebellar hemisphere. In vitro patch recordings from DCK/...

Urbano, Francisco J.; Simpson, John I.; Llina?s, Rodolfo R.

2006-01-01

320

Tonotopic organization in the depth of human inferior colliculus  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Experiments in animal models indicate that inferior colliculus (IC), the primary auditory midbrain structure, represents sound frequency in a particular spatial organization, a tonotopy, that proceeds from dorsal and superficial to ventral and deeper tissue. Experiments are presented that use high-resolution, sparse-sampling functional magnetic resonance imaging (fMRI) at 3T to determine if tonotopic gradients can be reliably measured in human IC using high-resolution fMRI. Stimuli were seque...

DavidRess; BharathChandrasekaran

2013-01-01

 
 
 
 
321

Nasal Septal Abscess as a Complication of Laser Inferior Turbinectomy.  

Directory of Open Access Journals (Sweden)

Full Text Available Postoperative infections are infrequent following laser inferior turbinate surgery. Wereport a 52-year-old man with a Klebsiella pneumoniae nasal septal abscess as a complicationof potassium-titanium-phosphate 532-nm laser turbinectomy. To our knowledge, this isthe first report of such a potentially serious complication resulting from minor ambulatoryintranasal surgery. The clinical presentation, pathogenesis, and management of nasal septalabscesses are discussed.

Shih-Hung Lo

2004-05-01

322

Long term complications of inferior vena cava thrombosis  

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AIM—To evaluate the long term outcome after paediatric inferior vena cava (IVC) thrombosis.?METHODS—A combined retrospective and prospective study on infants and children with IVC thrombosis treated at Aachen and Maastricht University Hospitals between 1980 and 1999.?RESULTS—Forty patients were enrolled, including four with preceding cardiac catheterisation, 18 with central venous saphenous lines, and an additional eight with umbilical venous catheters. Six patients d...

Hausler, M.; Hubner, D.; Delhaas, T.; Muhler, E.

2001-01-01

323

Cauterização química das conchas nasais inferiores com ácido tricloroacético  

Directory of Open Access Journals (Sweden)

Full Text Available Introdução: Obstrução nasal crônica secundária a hipertrofia das conchas nasais inferiores é um sintoma comum, de importante morbidade em nosso meio. Várias técnicas cirúrgicas são descritas para os casos refratários aos tratamentos clínicos, porém, há controversas sobre qual delas é a mais efetiva e sujeita a menos complicações. Objetivo: Avaliar a eficácia, a segurança e exequibilidade do uso do ácido tricloroacético ambulatorial para o tratamento da hipertrofia dos cornetos inferiores. Método: Trabalho prospectivo com 29 pacientes que foram submetidos à técnica ambulatorial de infiltração de ácido tricloroacético a 30% submucosa dos cornetos inferiores, sob anestesia tópica. Foram avaliados os sintomas de rinorreia e obstrução nasal utilizando escala visual e analógica (EVA 010 pré cauterização e um ano pós procedimento. Resultados: Diminuição significativa da obstrução nasal e da rinorreia um ano pós procedimento. As complicações foram sinéquias leves em dois pacientes e sangramentos, de pequena monta, em quatro casos com resolução espontânea. Conclusão: O método proposto apresentou ótimos resultados quanto à obstrução nasal e rinorreia, pode ser realizado em ambiente ambulatorial, e vem nos mostrando ser de baixa complicação.

Azevedo, Alexandre Fernandes de

2011-01-01

324

[Hypoxemia secondary to inferior vena cava return into left atrium].  

Science.gov (United States)

The case of a right-to-left shunt-induced hypoxemia with an abnormal return of the inferior vena cava (AIVCR) into the left atrium (LA) is reported in a 30-year-old male with cyanosis and polycythemia. The chest X ray and the lung CT scan was normal. Spirometry was normal but the transfert-CO coefficient (KCO) was lowered. Hypoxemia was observed at rest and worsening during exercise. The alveolo-arterial oxygen tension difference under hyperoxia was increased (56 kPa). Contrast echocardiography (CEch) suggested the presence of an AIVCR with a right-to-left shunt only observed by the inferior route. The inferior vena cava (IVC) angiography and the magnetic resonance imaging demonstrated an AIVCR characterized by a direct drainage of IVC in the left atrium. The good tolerance can be explained by the association of AIVCR with an inter-auricular septal defect resulting in a left-to-right shunt which partially corrected the right-to-left shunt. After surgical treatment, arterial blood gases normalized, KCO remained low and CEch became negative. PMID:11924187

Nassiri, A H; Gentil, B; Barthelet, M; Revel, D; Ninet, J; Cordier, J F; Bayle, J Y

2001-12-01

325

Inferior vestibular neuritis in a fighter pilot: a case report.  

Science.gov (United States)

Spatial disorientation in airplane pilots is a leading factor in many fatal flying accidents. Spatial orientation is the product of integrative inputs from the proprioceptive, vestibular, and visual systems. One condition that can lead to sudden pilot incapacitation in flight is vestibular neuritis. Vestibular neuritis is commonly diagnosed by a finding of unilateral vestibular failure, such as a loss of caloric response. However, because caloric response testing reflects the function of only the superior part of the vestibular nerve, it cannot detect cases of neuritis in only the inferior part of the nerve. We describe the case of a Chinese naval command fighter pilot who exhibited symptoms suggestive of vestibular neuritis but whose caloric response test results were normal. Further testing showed a unilateral loss of vestibular evoked myogenic potentials (VEMPs). We believe that this pilot had pure inferior nerve vestibular neuritis. VEMP testing plays a major role in the diagnosis of inferior nerve vestibular neuritis in pilots. We also discuss this issue in terms of aeromedical concerns. PMID:23780600

Xie, Su Jiang; Jia, Hong Bo; Xu, Po; Zheng, Ying Juan

2013-06-01

326

Efficacy of Radiofrequency Turbinatoplasty for Treatment of Inferior Turbinate Hypertrophy  

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Full Text Available Introduction: Nasal inferior turbinate hypertrophy is one of the most common causes of nasal obstruction. Many different surgical methods are currently available. The aim of this study was to review the efficacy and results of radiofrequency turbinatoplasty as a new method in the treatment of the large inferior nasal turbinate. Materials and Methods: This prospective study was conducted on 50 patients with symptoms and signs of nasal obstruction associated with inferior turbinate hypertrophy refractory to medical therapy. The turbinoplasty was performed using the radiofrequency method. Effectiveness of treatment, signs and symptoms before surgery compared to the first week, first and third month after surgery and possible complications were evaluated. Nasal endoscopy and visual analogue scale (VAS were used to assess treatment outcomes at the end of week 1 and months 1 and 3 after surgery. Results: In this study the average age was 24 years old. 27 male (54% and 23 female (46% are included in this study. The etiology was vasomotor rhinitis (28 cases and allergic rhinitis (22 cases. Turbinate edema and secretions decreased significantly (P

Nader Saki

2011-03-01

327

Radiation absorbed doses at radiographic examination of third molars  

International Nuclear Information System (INIS)

The radiation absorbed doses to critical organs, i.e. the thyroid and salivary glands and the gonadal region, were measured at radiographic examination of third molars. A tissue equivalent phantom was used together with ionization chamber detectors and TLDs. The greatest thyroid dose, 35 ?Gy, came from a mandibular disto-oblique projection with the circular tube collimator and Ultra-Speed film. The doses in different parts of the parotid gland from the disto-oblique mandibular projection with Ultra-Speed film ranged between 2.65 and 0.052 mGy. the corresponding doses in the submandibular gland were 1.74 mGy beneath the mandible and 0.458 mGy in the fovea. A rectangular tube collimator reduced the doses by approximately 50 %. The Ekta-Speed film requirted approximately 40 % lower exposure than the Ultra-Speed film. A horizontal radiation shield reduced the thyroid doses by between 12 and 46 % and the gonadal doses by between 50 and 95 %. The reduction effect from the shield was relatively greater when using the larger aperture of the tube collimator. Combinations of leaded aprons and soft leaded collars reduced the thyroid doses between 15 and 42 % and the gonadal doses by two orders of magnitude. (Authors)

328

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. Am J Phys Anthropol 156:148-157, 2015 © 2014 Wiley Periodicals, Inc. PMID:25209431

Zanolli, Clément

2015-01-01

329

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

330

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

331

Radix entomolaris in permanent mandibular first molars: case reports and literature review.  

Science.gov (United States)

This article presents three cases involving permanent mandibular first molars with unusual root morphology. While the permanent mandibular first molar normally has two roots (one mesial and one distal), an additional root sometimes is found distolingually; this condition is known as radix entomolaris (RE). This article also reviews the literature concerning the morphology, prevalence, etiology, classification, diagnosis, and significance of RE. PMID:21467000

Nagaveni, Nandanahosur B; Umashankar, Kagathur V

2009-01-01

332

Unusual neonatal tooth in maxillary 1 st molar region: A case report  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Teeth erupting within the first month after birth are known as neonatal teeth. Incidence of neonatal teeth is very low. Neonatal teeth erupt in various regions of the maxillary and mandibular arch. Incidence of neonatal teeth in molar region is only 1%. A case of an unusual neonatal tooth in the maxillary molar region has been presented.

Sarkar Subrata; Sarkar Soumyabrata

2007-01-01

333

Clinical treatment approach of a child with molar incisor hypomineralization (MIH) combined with malocclusion.  

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Introduction. Molar incisor hypomineralization (MIH) was defined as "hypomineralisation of systemic origin of permanent first molars, frequently associated with affected incisors". MIH includes the presence of demarcated opacity, post eruptive enamel breakdown, atypical restoration. ?he approach to management suggested: risk identification, early diagnosis, remineralization for prevention of caries and post eruption breakdown, restorations. The clinicians very seldom notice that children wit...

Rossitza Kabaktchieva; Vladimir Bogdanov

2012-01-01

334

In vivo and in vitro study of u59Fe uptake in developing rat molars  

International Nuclear Information System (INIS)

Autoradiographic methods were used to study 59Fe uptake in vivo in mineralizing tissues of young rats. Localization of 59Fe was observed in the ameloblastic layer of molars. In vitro studies were performed which demonstrated that 59Fe uptake in developing rat molar enamel was limited by the metabolic activity of the cells of the enamel organ. (Auth.)

335

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)

336

Síndrome de compresión de vena cava inferior secundario a fibrosis retroperitoneal / Inferior vena cava compression syndrome secondary to retroperitoneal fibrosis  

Scientific Electronic Library Online (English)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish Se estudió un paciente de 57 años de edad, de tez negra, con edemas en miembros inferiores relevantes por su volumen y extensión. Se realizó la discusión clínica la cual orientó hacia la búsqueda de una lesión o tumor retroperitoneal asociado a un síndrome de compresión u obstrucción de vena cava in [...] ferior y se comprobó imagenológicamente. La confirmación histológica se obtuvo por vía quirúrgica. Abstract in english We studied a 57 year-old patient of black complexion, with swelling of the lower limbs which was relevant due to its mass and extension. The clinical discussion guided us to search for a lesion or retroperitoneal tumor associated with a compression syndrome or obstruction of the inferior vena cava, [...] which was determined radiologically. Histological confirmation was obtained through surgery.

Alberto, Miranda Bravo; Milagros I, Collazo-Ramos; Asbel Vicente, de la Cruz; Digna, Chávez Jiménez.

2010-09-01

337

Standard molar enthalpies of formation and of sublimation of the terphenyl isomers  

International Nuclear Information System (INIS)

The standard (p0 = 0.1 MPa) molar enthalpies of formation in the crystalline phases of ortho, meta and para-terphenyl isomers, at T = 298.15 K, were derived from the standard molar energies of combustion, measured by mini-bomb combustion calorimetry. The Knudsen mass-loss effusion technique was used to measure the dependence of the vapour pressure of the crystals with the temperature, thus deriving their standard molar enthalpies of sublimation by means of the Clausius-Clapeyron equation. Combining the standard molar enthalpies of formation and sublimation of the crystalline terphenyls, the standard molar enthalpies of formation in the gaseous state, at T = 298.15 K, were derived for the three isomers. Results are provided in a table. The results show small but detectable isomerization enthalpies between the terphenyls, indicating the following relative enthalpic stabilities: m- > p- ? o-terphenyl

338

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 SciELO Chile | Language: English Abstract in spanish 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 magnificación de 40X. Se midieron los diámetros mayor y menor de cada foramen fisiológico mediante el programa Motic Images plus 2.0 ML. La forma de los forámenes fue determinada de acuerdo a la diferencia entre diámetro mayor y menor, clasificándose como redondo, oval o irregular. Un total de 174 forámenes fisiológicos fueron analizados. El promedio del diámetro menor y mayor fue entre 0,24­0,33 mm en primeros molares maxilares y entre 0,25­0,33 mm en primeros molares mandibulares. En molares maxilares, la forma del foramen más común fue la oval (50%), luego irregular (32%) y redonda (18%). En molares mandibulares, la forma oval también fue la más frecuente (59%), seguida por la irregular (23%) y redonda (18%). Los hallazgos de este estudio en relación a morfología de los forámenes fisiológicos apicales en primeros molares, permite al operador facilitar la elección de instrumentos del calibre adecuado para realizar con éxito la terapia endodóntica. Abstract in english Information regarding the anatomy of the physiological apical foramen is limited. Knowing its diameter and shapes contributes to clinical work, specifically to the cleaning and shaping of the apical third. The aim of this ex vivo study was to determine the minimum and maximum diameters and shape of [...] the physiological apical foramen in the roots of maxillary and mandibular first molars. A descriptive study was conducted on 89 recently extracted first molars. Roots 3-5 mm from the apex were sectioned and prepared for analysis at 40x magnification. The minimum and maximum diameters of each physiological foramen were measured using the program Motic Images plus 2.0 ML. The shape of the foramina, classified as round, oval or irregular, was determined by the difference between the maximum and minimum diameters. A total of 174 physiological foramina were analyzed. The average of the minimum and maximum diameters was between 0.24-0.33 mm in maxillary first molars and between 0.25-0.33 mm in mandibular first molars. In maxillary molars, the most common shape of the foramen was oval (50%), then irregular (32%), then round (18%). In mandibular molars, the oval shape was also the most frequent (59%), followed by irregular (23%) and round (18%). The findings of this study regarding the morphology of physiological apical foramina in first molars make it easier for the operator to choose the appropriately-sized instruments to perform endodontic therapy successfully.

J, Abarca; C, Zaror; H, Monardes; V, Hermosilla; C, Muñoz; M, Cantin.

2014-06-01

339

Avaliação da quantidade de movimentação dos molares superiores com emprego do aparelho de Herbst Assessment of the displacement of the upper molars using the Herbst appliance  

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Full Text Available O Herbst é um aparelho ortopédico funcional fixo destinado principalmente ao estímulo de crescimento mandibular durante a correção da má oclusão de Classe II esquelética de pacientes em crescimento. Várias publicações descreveram os efeitos deste aparelho durante a correção da Classe II, revelando a promoção de alterações esqueléticas e dentárias em igual proporção, favorecendo sua correção. Parte do movimento dentário ocorre por distalização dos primeiros molares superiores. Esta pesquisa teve como objetivo avaliar a quantidade e o tipo de movimento distal ocorrido com os primeiros molares superiores permanentes, e a conseqüência destes movimentos sobre o plano oclusal funcional durante o período de utilização do aparelho de Herbst. A amostra foi composta de 22 pacientes portadores da má oclusão de classe II esquelética, retrognatismo mandibular, com idade média de 12 anos e 11 meses, tratados por um período médio de 10,1 meses. Os aparelhos foram construídos utilizando a ancoragem total no arco maxilar, visando potencializar a ação ortopédica e minimizar a perda de ancoragem. As alterações foram medidas em cefalogramas específicos obtidos das telerradiografias em norma lateral tomadas em dois tempos: tempo 1 (T1 antes da instalação do aparelho, e tempo 2 (T2, após sua remoção. Medidas cefalométricas lineares e angulares em relação ao plano horizontal de Frankfurt, plano palatino e a uma linha vertical de referência a partir do ponto S perpendicular a Frankfurt, foram utilizadas para quantificar os deslocamentos dos primeiros molares superiores. Foram avaliados: o deslocamento distal médio das coroas, o deslocamento distal médio de suas raízes, a conseqüente inclinação no longo eixo dos molares durante a distalização, o deslocamento vertical em relação ao plano palatino, e finalmente, a conseqüência da variação vertical do primeiro molar sobre o plano oclusal funcional. Os mostraram distalização molar em todos os casos, em média a distalização das coroas foi de 1,6 mm e a distalização de raízes, média 1,1 mm. A intrusão média foi de 0,8 mm em relação ao plano palatino, com a inclinação distal média dos molares de 2,6º, alterações significante estatisticamente. O plano oclusal apresentou inclinação no sentido horário em relação ao plano horizontal de Frankfurt de 2,5º, em média. Concluimos que o aparelho de Herbst é capaz de promover distalização e intrusão dos primeiros molares superiores.The Herbst appliance is an orthopedic fixed device for treatment of class II malocclusion mainly directed to mandibular growth stimulation in growing patients. Several papers have described its effects during the Class II correction, showing it´s dental and skeletic action occuring in the same proportion. Part of the dental movement is upper molar distalization. This search had the objective of assessing the kind and amount of first upper molar movement using the Herbst appliance. The sample was composed by 22 skeletal Class II young patients, mean age 12 years 11 months, treated during a period of 10,1 month. The Herbst was constructed using the total anchorage method on the maxillary arch. Lateral cephalometric analysis was used joining linear and angular mesurements in two ocasions: T1, before tretment, and T2 after the appliance had been removed. The refference lines used to compare the points located in the upper molar were the horizontal Frankfurt an S perpendicular throw Frankfurt. The results showed significant distal movement of the molar crown and root while the oclusal surface was intruded in comparing to palatal plane. In consequence the occlusal plane rotated in relation to Frankfurt. Our conclusion is that the Herbst appliance is able to promote molar distalization and molar intrusion on the upper arch.

Paulo Cezar Rodrigues Ogeda

2004-08-01

340

Avaliação da quantidade de movimentação dos molares superiores com emprego do aparelho de Herbst / Assessment of the displacement of the upper molars using the Herbst appliance  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese O Herbst é um aparelho ortopédico funcional fixo destinado principalmente ao estímulo de crescimento mandibular durante a correção da má oclusão de Classe II esquelética de pacientes em crescimento. Várias publicações descreveram os efeitos deste aparelho durante a correção da Classe II, revelando a [...] promoção de alterações esqueléticas e dentárias em igual proporção, favorecendo sua correção. Parte do movimento dentário ocorre por distalização dos primeiros molares superiores. Esta pesquisa teve como objetivo avaliar a quantidade e o tipo de movimento distal ocorrido com os primeiros molares superiores permanentes, e a conseqüência destes movimentos sobre o plano oclusal funcional durante o período de utilização do aparelho de Herbst. A amostra foi composta de 22 pacientes portadores da má oclusão de classe II esquelética, retrognatismo mandibular, com idade média de 12 anos e 11 meses, tratados por um período médio de 10,1 meses. Os aparelhos foram construídos utilizando a ancoragem total no arco maxilar, visando potencializar a ação ortopédica e minimizar a perda de ancoragem. As alterações foram medidas em cefalogramas específicos obtidos das telerradiografias em norma lateral tomadas em dois tempos: tempo 1 (T1) antes da instalação do aparelho, e tempo 2 (T2), após sua remoção. Medidas cefalométricas lineares e angulares em relação ao plano horizontal de Frankfurt, plano palatino e a uma linha vertical de referência a partir do ponto S perpendicular a Frankfurt, foram utilizadas para quantificar os deslocamentos dos primeiros molares superiores. Foram avaliados: o deslocamento distal médio das coroas, o deslocamento distal médio de suas raízes, a conseqüente inclinação no longo eixo dos molares durante a distalização, o deslocamento vertical em relação ao plano palatino, e finalmente, a conseqüência da variação vertical do primeiro molar sobre o plano oclusal funcional. Os mostraram distalização molar em todos os casos, em média a distalização das coroas foi de 1,6 mm e a distalização de raízes, média 1,1 mm. A intrusão média foi de 0,8 mm em relação ao plano palatino, com a inclinação distal média dos molares de 2,6º, alterações significante estatisticamente. O plano oclusal apresentou inclinação no sentido horário em relação ao plano horizontal de Frankfurt de 2,5º, em média. Concluimos que o aparelho de Herbst é capaz de promover distalização e intrusão dos primeiros molares superiores. Abstract in english The Herbst appliance is an orthopedic fixed device for treatment of class II malocclusion mainly directed to mandibular growth stimulation in growing patients. Several papers have described its effects during the Class II correction, showing it´s dental and skeletic action occuring in the same propo [...] rtion. Part of the dental movement is upper molar distalization. This search had the objective of assessing the kind and amount of first upper molar movement using the Herbst appliance. The sample was composed by 22 skeletal Class II young patients, mean age 12 years 11 months, treated during a period of 10,1 month. The Herbst was constructed using the total anchorage method on the maxillary arch. Lateral cephalometric analysis was used joining linear and angular mesurements in two ocasions: T1, before tretment, and T2 after the appliance had been removed. The refference lines used to compare the points located in the upper molar were the horizontal Frankfurt an S perpendicular throw Frankfurt. The results showed significant distal movement of the molar crown and root while the oclusal surface was intruded in comparing to palatal plane. In consequence the occlusal plane rotated in relation to Frankfurt. Our conclusion is that the Herbst appliance is able to promote molar distalization and molar intrusion on the upper arch.

Paulo Cezar Rodrigues, Ogeda; Jorge, Abrão.

2004-08-01

 
 
 
 
341

Schwannoma of the inferior turbinate: case report and review of literature / Schwannoma de corneto inferior: relato de caso e revisão da literatura  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese Schwannomas do trato nasossinusal são condições raras, passíveis de ressecção local. Apresentamos o caso de um paciente de 69 anos de idade com schwannoma de corneto inferior, que foi ressecado com sucesso. São muito raros os casos relatados de schwannoma originando-se do corneto inferior. [...] Abstract in english Schwannomas of the sinonasal tract are rare entities that are amenable to local resection. We present a 69 year old woman with a schwannoma of the inferior turbinate that was successfully resected. Schwannomas arising from the inferior turbinate are very infrequent. [...

Iman, Khodaei; Elgan, Davies.

2008-06-01

342

PARTIAL MOLAR VOLUME OF SOME ALKANOLAMINES IN WATER AT 298.15 K / VOLUME MOLAR PARCIAL DE ALGUMAS ALCANOLAMINAS EM ÁGUA A 298,15 K / VOLUMEN MOLAR PARCIAL DE ALGUNAS ALCANOLAMINAS EN AGUA A 298,15 K  

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: English Abstract in portuguese As densidades de soluções aquosas de 3-amino-1-propanol, 2-amino-1-propanol, 3-amino-1,2-propanediol and 1,3-diamino-2-propanol foram medidas a 298 K utilizando a técnica de tubo vibratório. Os volumes molares aparentes das alcanolaminas foram determinados como uma função de composição partindo de d [...] ados experimentais e parciais volumes molares de solutos na diluição infinita foram obtidos por extrapolação. Os resultados são discutidos em termos do efeito do número e da posição dos grupos polares nas moléculas. Abstract in spanish Las densidades de soluciones acuosas de 3-amino-1-propanol, 2-amino-1-propanol, 3-amino-1,2-propanodiol y 1,3-diamino-2-propanol fueron medidas a 298,15 K usando la técnica del tubo vibrante. Los volúmenes molares aparentes se determinaron en función de la composición a partir de los datos experimen [...] tales y los volúmenes molares parciales de los solutos a dilución infinita fueron obtenidos por extrapolación. Los resultados son discutidos en términos del efecto del número y la posición de los grupos polares en las moléculas. Abstract in english Densities of aqueous solutions of 3-amino-1-propanol, 2-amino-1-propanol, 3-amino-1,2-propanediol, and 1,3-diamino-2-propanol were measured at 298.15 K using the vibrating tube technique. The apparent molar volumes of the alkanolamines were determined as a function of composition from experimental d [...] ata and the solute limiting partial molar volume was obtained through extrapolation. The results are discussed in terms of the effect of the number and the position of polar groups in the molecules.

Carmen M., Romero; Yadhi P, Cruz.

2011-12-01

343

Colgajos de perforantes de las arterias epigástricas inferiores profunda y superficial / Deep and superficial inferior epigastric artery perforator flaps  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: Spanish Abstract in spanish Con el desarrollo de los colgajos miocutáneos de recto abdominal (TRAM), el abdomen inferior ha sido reconocido como la principal área dadora de tejidos autólogos de alta calidad, especialmente útiles en reconstrucción mamaria. Más recientemente la habilidad para obtener componentes adiposocutáneos [...] similares sin sacrificar el músculo recto ha revolucionado el campo de la Cirugía Reconstructiva. El advenimiento de los colgajos de perforantes ha permitido a los cirujanos plásticos lograr los mismos buenos resultados estéticos que con los colgajos miocutáneos tradicionales, pero con un considerable descenso en la morbilidad del área donante. Con los colgajos de perforantes de la arteria epigástrica inferior profunda (DIEP) y de la arteria epigástrica inferior superficial (SIEA), los pacientes han incrementado sus opciones de reconstrucción. Este artículo revisa la anatomía quirúrgica de la pared abdominal relativa a los colgajos SIEA y DIEP. Se explican detalladamente los pasos principales para la preparación preoperatoria, la técnica quirúrgica y los cuidados postoperatorios. Se discuten las ventajas y desventajas y se presen- tan los trucos técnicos que pueden ayudar a mejorar el resultado final. Además se ilustran con ayuda de casos clínicos las indicaciones típicas y atípicas. Abstract in english Following the development of the transverse rectus abdominis myocutaneous (TRAM) flap, the lower abdomen has been recognized as a prime source of high quality autogenous tissue, especially useful in breast reconstruction. More recently, the ability to harvest a similar adipocutaneous component witho [...] ut sacrifice of the rectus muscle has revolutionized the field of reconstructive surgery. The advent of perforator flaps has allowed plastic surgeons to achieve the same highly esthetic results as with the former myocutaneous flaps while significantly decreasing the donor site morbidity. With the deep inferior epigastric artery perforator (DIEP) flap and the superficial inferior epigastric artery (SIEA) flap becoming more mainstream, patients are increasingly seeking these reconstructive options. This article reviews the surgical anatomy of the abdominal wall as related to the SIEA and DIEP flaps. Key steps of preoperative preparation, operative technique and postoperative care are explained in details. Specific advantages and disadvantages are discussed and technical tips are presented to help improve final outcome. In addition, typical and atypical indications are illustrated with the use of clinical cases.

A. R., Gagnon; P. N., Blondeel.

2006-12-01

344

Influência da temperatura, da massa molar e da distribuição de massa molar na tensão superficial de PS, PP e PE: experimento e teoria  

Directory of Open Access Journals (Sweden)

Full Text Available Neste trabalho a influência da temperatura, da massa molar (n e da distribuição de massa molar (MWD na tensão superficial de poliestireno (PS foi avaliada utilizando o método da gota pendente. A influência da temperatura na tensão superficial de polipropileno isotático (i-PP e de polietileno de baixa densidade (PELBD também foi estudada aqui. As teorias de Patterson-Rastogi e Dee-Sauer foram utilizadas em conjunção com a teoria de equação de estado de Flory, Orwoll, e Vrij (FOV para prever a tensão superficial (gama utilizando dados de pressão-volume-temperatura (PVT dos polímeros. Ambas teorias prevêem que a tensão superficial diminui linearmente com o aumento da temperatura e aumenta com a massa molar concordando com os resultados experimentais. Entretanto, ambas teorias subestimam a mudança de entropia de formação de superfície por unidade de área a volume constante para sistemas poliméricos de baixa massa molar e polidisperso e subestimam o efeito da distribuição de massa molar na tensão superficial

Moreira José C.

2003-01-01

345

Multicentric pheochromocytoma and involvement of the inferior vena cava  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese CONTEXTO: Feocromocitoma com invasão de veia cava inferior é raro. Tumores multicêntricos são igualmente raros, estando presentes em até 10% dos casos. A cirurgia é o tratamento de escolha, uma vez que a sobrevida livre da doença é longa. TIPO DE ESTUDO: Relato de caso. RELATO DE CASO: Relatamos um [...] caso de feocromocitoma de adrenal direita com extensão para veia cava inferior supra-diafragmática, retirado cirúrgicamente através de tóraco-freno-laparotomia, sem a necessidade de circulação extra-corpórea. Após seis anos de seguimento, outro feocromocitoma foi achado no órgão de Zuckerkandl. A excisão cirúrgica completa do tumor foi realizada através de laparotomia mediana e dissecção retroperitoneal. Em ambos os casos, margens cirúrgicas livres do tumor e níveis pós-operatórios normais de catecolaminas garantiram remoção total do feocromocitoma. O estudo anatomopatológico revelou feocromocitoma maligno com margens livres de neoplasia em ambos os espécimes. Abstract in english CONTEXT: Extension of pheochromocytomas to the inferior vena cava is rare. Multicentric tumors are rare as well, being present in up to 10% of cases. Surgery is the treatment of choice because of the long-term survival free of disease. DESIGN: Case report. CASE REPORT: We report on a case of right a [...] drenal pheochromocytoma with extension to the supra-diaphragmatic vena cava, which underwent surgical excision through thoracophrenic laparotomy without the need for cardiopulmonary bypass. In a 6-year follow-up, another pheochromocytoma was found in the infra-renal Zuckerkandl's organ. Complete surgical excision of the tumor was performed by a median laparotomy and complete retroperitoneal dissection. In both cases, the total removal of the pheochromocytoma has been guaranteed by having margins free of tumor and a normal post-operative level of catecholamines. The pathological study revealed a malignant pheochromocytoma with margins free of neoplasia in both specimens.

Antonio Marmo, Lucon; Renato, Falci Júnior; José Nery, Praxedes; Marcel Cerqueira Cesar, Machado; Luis Balthazar, Saldanha; Marcelo Marcondes, Machado; Sami, Arap.

2001-03-01

346

Prevalence of taurodontism in primary mandibular first molars of ethnic Indian children.  

Science.gov (United States)

The objective of this study was to determine the prevalence of taurodontism in primary mandibular first molars in ethnic Indian children using periapical radiographs. Periapical radiographs of 274 children obtained from December 2008 to August 2010 were retrospectively screened and examined. Radiographs of 196 patients (99 boys and 97 girls; ages 2.5-10.5) with bilateral primary mandibular first molars were randomly selected and evaluated. The gender, symmetry, and frequencies of occurrence of taurodont primary mandibular first molars were compared and the obtained data were statistically analyzed using the x2 test. Eight (4.08%) taurodont primary mandibular first molars were found with a bilateral incidence of a symmetrical distribution of 38% (3/8). The prevalence of taurodontism in primary mandibular first molars did not differ significantly between right and left sides or with gender (P ? 0.05). The results of the present study indicate that approximately 4% of Indian children had taurodontism in primary mandibular first molars. Clinicians should be aware of the prevalence of this anatomic variant in primary mandibular first molars among the Indian population for early identification of taurodonts and for rendering the best care during dental treatment. PMID:23032243

Nagaveni, N B; Radhika, N B

2012-01-01

347

Predicting lower third molar eruption on panoramic radiographs after cephalometric comparison of profile and panoramic radiographs  

DEFF Research Database (Denmark)

Previous studies have suggested methods for predicting third molar tooth eruption radiographically. Still, this prediction is associated with uncertainty. The aim of the present study was to elucidate the association between cephalometric measurements on profile and panoramic radiographs and to find a simple and reliable method for predicting the eruption of the mandibular third molar by measurements on panoramic radiographs. The material consisted of profile and panoramic radiographs, taken before orthodontic treatment, of 30 males and 23 females (median age 22, range 18-48 years), with no known diseases. Cephalometric measurements on panoramic and profile radiographs were performed and compared, i.e. the size of the gonial angle and sagittal distance from the alveolar margin between the mandibular central incisors to the anterior border of the mandibular ramus. Furthermore, the mesiodistal width of the second molar was measured. Statistical methods included analysis of method error. The probability of eruption was modelled using logistic regression analysis. Correlation was observed between all measurements on profile and panoramic radiographs. The skeletal variable expressing the length from the ramus to the incisors (olr-id) showed a statistically significant correlation. By combining this length with the mesiodistal width of the lower second molar, the prediction of eruption of the lower third molar was strengthened. A new formula for calculating the probability of eruption of the mandibular third molar was made and a graph constructed for easy assessment. In conclusion, a simple method for predicting the eruption of the third molar is presented.

Begtrup, Anders; GrØnastØð, Halldis Á

2012-01-01

348

Evaluation of the distortion rate of panoramic and peri apical radiographs in erupted third molar inclination  

International Nuclear Information System (INIS)

Panoramic and peri apical radiographs are normally used in impacted third molar teeth surgeries. The aim of the present study was to evaluate and compare the distortion of the erupted third molar teeth on panoramic and peri apical radiographs. Patients and Methods: A total of 44 radiographs were obtained of 22 patients (age range, 18-24 years) referred to the faculty of dentistry for orthodontic treatment. A plaster cast was prepared and panoramic radiography was taken for all patients to plan the orthodontic treatment and peri apical radiography was taken for investigation of tooth structure details. Therefore, a total of 66 views and samples were studied by two methods: 1) Measuring the angle between the longitudinal plane of the third molar and occlusal plane. 2) Measuring the angle between the longitudinal plane of second and third molar. Finally, 132 records were evaluated by one individual. Results: There was no significant statistical difference between the mean position of the third molar on panoramic, peri apical radiographs and the casts. However, measurements of the third molars on peri apical radiographs were slightly closer to the measurements of the casts compared to the panoramic radiographs. Conclusion: Distortion does not have a specific effect on the diagnosis of the position of the third erupted molars by peri apical or panoramic radiographs, though various studies have shown that these radiographs have an amount of distortion and peri apical radiogmount of distortion and peri apical radiographical distortion is less than that in panoramic radiography.

349

Superior and inferior vena cavae: Embryology, variants, and pathology  

International Nuclear Information System (INIS)

The superior and inferior venae cavae may be involved in a host of disease processes. Knowledge of the normal anatomy and variants of these structures is valuable in interpreting plain films and the results of angiographic procedures and all cross-sectional modalities. The authors review the embryology of venae cavae and proceed to describe their normal anatomy and variants. An awareness of the variants can prevent mistaking variants for pathologic processes. Finally, the authors describe pathology involving these vessels and demonstrate the radiographic manifestations

350

Complex hybrid suprarenal inferior vena cava filter retrieval.  

Science.gov (United States)

The exponential rise in inferior vena cava (IVC) filter placement is associated with increased complications both during implantation and retrieval. In this report, a 64-year-old man was transferred from an outside hospital with cardiac tamponade secondary to a snare eroding into the right atrium. This complication occurred after attempted suprarenal IVC filter removal. The filter, entangled with the snare, was retrieved by a hybrid technique of mobilizing the liver to expose the suprarenal IVC, followed by using a snare and sheath to compress and extrude the filter. This is the first reported hybrid retrieval of a suprarenal IVC filter. PMID:25304904

Chou, Elizabeth L; Sgroi, Michael D; Fujitani, Roy M; Kabutey, Nii-Kabu

2015-01-01

351

Eficacia del Tratamiento con Amoxicilina en la Prevención de Complicaciones Postoperatorias en Pacientes Sometidos a Cirugía del Tercer Molar: un Estudio Doble Ciego / Efficacy of Amoxicillin Treatment in Preventing Postoperative Complications in Patients Undergoing Third Molar Surgery: a Double Blind Study  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: Spanish Abstract in spanish El objetivo de esta investigación fue estudiar clínicamente la eficacia de la terapia con amoxicilina en terceros molares retenidos sobre las condiciones postoperatorias de edema, dolor, trismus e infección. Fueron seleccionados 14 pacientes de entre 15 y 30 años con la retención de los dientes 3.8 [...] y 4.8 en la misma posición según las clasificaciones utilizadas actualmente. Se realizó inicialmente una cirugía y posteriormente la segunda; se estableció un grupo test con terapia antibiótica (amoxicilina 500mg c/8h por 7 días) y un grupo control que no utilizo antibióticos. El edema fue estudiado a través de la distancia de puntos faciales de referencia y la evaluación del trimus fue obtenida por medio de la distancia interincisal superior e inferior. El dolor fue estudiado mediante escala visual análoga. No existió diferencia estadísticamente significativa en relación al edema y al trismus en los periodos estudiados; existió diferencia estadísticamente significativa respecto al dolor durante los primeros dos días, siendo el grupo test que presentaba más dolor. A los 7 días ya no se apreció diferencias. Finalmente, la amoxicilina como terapia posterior a la exodoncia de terceros molares no se relaciona con las condiciones postoperatorias del paciente. Abstract in english The aim of this study was to clinically evaluate the efficacy of antibiotics in retained third molar extractions, determining the need of antibiotics prophylaxis use in these procedures. Fourteen (14) patients, aged between 15 and 30 years, irrespective of sex, color or race were selected, for remov [...] al of retained third molars in symmetrical positions. The surgeries were divided into two groups: the control group in the first surgery and the second group undergoing prophylactic administration of 500 mg of amoxicillin 8 / 8 hours, for seven days after surgery. The evaluation of edema was established by the distance of reference points and assessment of facial trismus and was obtained by top and bottom interincisal distance. Measurements were performed before and after surgery, 24, 48 hours and for 7 days. Pain was evaluated subjectively by a visual analog scale. There was no statistically significant difference with respect to swelling and trismus after dental extractions with or without the use of antibiotics, and there was statistically significant difference in relation to pain in the postoperative periods of 24 and 48 hours, and increased pain reported by the test group. At day seven no differences were noted in perception of pain between the groups. Finally, the amoxicillin therapy subsequent to the third molar surgery is not related to the postoperatory conditions of the patient.

Walter Leal, de Moura; Weber Leal, de Moura; Simei André da Silva Rodrigues, Freire; Suyá Moura, Mendes; Sergio, Olate.

2011-08-01

352

First Permanent Molars and Dental Expenses: Should Pit and Fissure Sealants Be Used?  

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Full Text Available Aim: We attempted to assess the part care to the first permanent molars represents in total spending for dental care and to estimate the economic and medical advisability of using the pit and fissure sealing technique on the first permanent molars for the prevention of tooth decay. Method: We studied a representative sample of 2649 affiliates in the Nord – Pas-de-Calais and Picardie regions who were reimbursed for dental care on October 15, 1998. 54% of the patients in the sample (1437 were examined by a member of health care’s advisory dental staff. Results: The first permanent molars represent 28% of total reimbursed costs for care given to all the permanent teeth. 34% of all reimbursed conservative treatment for the first permanent molars concern patients under twenty years of age. In children aged 5 to 9 years who had reimbursed dental care, caries occurring on the occlusal side of the first permanent molars constitute 71% of all decayed or filled first molars. 47% of all patients in this age group have dental caries on the occlusal side of at least one permanent molar. 87% of their first molars present caries on the occlusal surface or have no tooth decay. We failed to find any correlation between dental decay on the occlusal surface and the socio-economic characteristics of the affiliates. Conclusion: All children between 5 and 9 years old do not require pit and fissure sealing for the prevention of dental caries on the occlusal surface of their first permanent molars. Before this technique is approved for reimbursement by health insurance, guidelines are needed for defining its indications.

Legal G

2000-12-01

353

Determinação da massa molar por crioscopia: terc-butanol, um solvente extremamente adequado Molar mass determination by cryoscopy: tert-butyl alcohol, an extremely appropriate solvent  

Directory of Open Access Journals (Sweden)

Full Text Available We intend to divulge an easy experiment that permits the determination of molar masses of various compounds by cryoscopy. The major advantage of this is the use of the tert-butyl alcohol as a solvent, which requires simple apparatus and easy procedures. The melting point of this alcohol is around 25 ºC, which makes it easy to freeze and then melt the solutions. This solvent has a high cryoscopic constant and is miscible with both polar and non-polar compounds. The molar masses of acetone, water, chloroform, dichloro-methane, ethanol, hexane, carbon tetrachloride and toluene were determined. The results were good except for water. Even though there are reliable techniques of molar mass determination nowadays, this method is still frequently taught in undergraduate courses.

Anderson R. dos Santos

2002-09-01

354

Hypohyperdontia: Agenesis of three third molars and mandibular centrals associated with midline supernumerary tooth in mandible.  

Science.gov (United States)

Agenesis of teeth in a patient who also presents with a supernumerary tooth is one of the rare numerical anomalies in human dentition. Agenesis of third molars was shown to be associated with other missing permanent teeth. A review of literature on hypodontia including third molar agenesis, hyperdontia and a concomitant presence of these two conditions which is termed as hypohyperdontia is presented along with a case showing agenesis of three third molars, both mandibular central incisors and a midline supernumerary tooth. PMID:22114403

Nuvvula, Sivakumar; Kiranmayi, M; Shilpa, G; Nirmala, S V S G

2010-07-01

355

Distalizador de molares superiores con pistones de níquel–titanio. Informe de un caso  

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Full Text Available 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.

Rafael J. Prato

2007-12-01

356

Influence of Different Apical Preparations on Root Canal Cleanliness in Human Molars: a SEM Study  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Objectives: To compare the influence of type and dimensions of the apical preparation on the cleanliness of the apical area in molars. Material and Methods: A total of 120 root canals (MB and DB root canals from 30 maxillary molars and mesial root canals from 30 mandibular molars) were instrumented with Mtwo NiTi rotary instruments to a size 25/0.06 taper and were equally divided into three different experimental groups depending on the subsequently apical root canal preparation: Group 1:...

Gianluca Plotino; Luigi Tocci; Luca Testarelli; Gianluca Gambarini

2014-01-01

357

The effectiveness of a single osteointegrated implant combined with pendulum springs for molar distalization.  

Science.gov (United States)

The aim of this report was to present the clinical efficiency of a single osteointegrated implant combined with pendulum springs for molar distalization. A 15-year-old girl sought treatment for irregular anterior teeth and poor smile esthetics. A novel appliance was designed that combined osteointegrated implants with 0.032-in beta-titanium wire and pendulum springs. The treatment results were evaluated from lateral cephalometric radiographs. Distalization of the maxillary first molars was achieved in 6 months. Total treatment time was 21 months. Facial esthetics improved as a consequence of treatment. This appliance design offers reliable molar distalization, even when absolute anchorage is required. PMID:17276871

Onca?, Gökhan; Akyalçin, Sercan; Arikan, Fatih

2007-02-01

358

Two-Rooted Maxillary First Molars with Two Canals: A Case Series  

Directory of Open Access Journals (Sweden)

Full Text Available Thorough understanding of the anatomic and internal morphology of a root canal system is absolutely essential for the success of endodontic treatment. Since permanent maxillary first molars have shown variation in internal anatomy, morphology, this tooth has been reviewed extensively. Presence of two canals in a two-rooted maxillary first molar has rarely been reported in studies describing tooth and root canal anatomies. In this report, three cases are presented, which involve the root canal treatment of maxillary first molars with fusion of the two buccal roots.

Seddigheh Gholizadeh

2013-01-01

359

Partial molar volumes of isoniazid solutions in aqueous-ethanol mixtures at 298.15 K  

Science.gov (United States)

Densities (?) of antitubercular drug isoniazid solutions in water, aqueous-ethanol (20-80 vol % EtOH) and in pure ethanol at 298.15 K with different molar concentrations (0.01-0.16 mol dm-3) were measured. Experimental density data were used to calculate apparent molar volumes (? v ) of isoniazid in different media. The ? v data were fitted to Massons relation and partial molar volumes (?{/v 0}) of drug for infinitely dilute solution were determined for each solution. Experimental and derived properties were interpreted in terms of drug-solvent molecular interactions and structural fittings in studied systems.

Deosarkar, S. D.; Sawale, R. T.; Tawde, P. D.; Kalyankar, T. M.

2015-02-01

360

Trauma grave em membro inferior / Severe lower limb trauma  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese Traumatismos graves de membros inferiores, com grandes perdas cutâneas e comprometimento de estruturas vitais, são casos de difícil resolução. A combinação de vários fatores, como esforço realizado e capacidade de distinguir a gravidade das lesões, ou seja, diferenciar as lesões recuperáveis ou viáv [...] eis daquelas que inevitavelmente irão evoluir para amputação, tem importante papel. Para tanto, surgiram índices que buscam estratificar a gravidade da lesão e predizer a necessidade de amputação, como o índice MESS (do inglês, Mangled Extremity Severity Score). Neste artigo, é reportado um caso de trauma grave de membro inferior, com reconstrução baseada no índice MESS, com emprego de múltiplos retalhos musculares e boa evolução funcional. Abstract in english Severe trauma to the lower limbs, with major skin loss and the compromise of vital structures, is often difficult to treat. A combination of several factors such as ability and effort made to distinguish lesion severity - that is, to differentiate recoverable traumas from those that will inevitably [...] progress to amputation - plays an important role. Therefore, indices were developed to facilitate the stratification of injury severity and prediction of the need for amputation, such as the Mangled Extremity Severity Score (MESS). In this article, we report a case of severe trauma to the lower limb, where reconstruction was performed based on the MESS index with multiple muscle flaps, and a good functional outcome was achieved.

Regis Pietro Acempcion, Guiraldo; Cassiana Martins, Cabral; Ricardo Thompson, Nora; José Álvaro Lourenço, Gasques; Antonio Roberto, Bozola.

2013-06-01