WorldWideScience
 
 
1

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  

Energy Technology Data Exchange (ETDEWEB)

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

2

Lower Third Molar Region / Región del Tercer Molar Inferior  

Scientific Electronic Library Online (English)

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

3

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | 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.

4

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | 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

5

Retenção prolongada de segundos molares decíduos inferiores: relato de caso  

Directory of Open Access Journals (Sweden)

etiological factors as well as its clinical resolution. Results: The approach of this case report was the teeth extraction of lower primary second molars considering the prior orthodontic management. Conclusions: The correct diagnosis through anamnesis, clinical and radiographic examination should be realized, just as measures to avoid a delay in the eruption of teeth and the impactation of the permanent sucessors.

Fernanda Nah\\u00E1s Pires Corr\\u00EAa

2010-01-01

6

Corticoesteroides y cirugía del tercer molar inferior: Revisión de la literatura Corticoesteroids and impacted lower third molar surgery: Literature review  

Directory of Open Access Journals (Sweden)

Full Text Available El objetivo de este trabajo es buscar la evidencia disponible con respecto al uso, justificación, efectos secundarios y eficacia de corticosteroides para reducir el dolor e inflamación postoperatorios en la extracción quirúrgica de terceros molares. Queremos saber si en pacientes adultos, es la prescripción de antiinflamatorios esteroideos además de los antiinflamatorios no esteroideos (AINES, en comparación con la administración única de AINES, más efectiva para mejorar, aliviar o eliminar los síntomas de inflamación y dolor después de la extracción quirúrgica de terceros molares inferiores. En la revisión de la literatura se ha utilizando la base de datos Medline con las palabras clave "esteroides" y "terceros molares" o "Muelas del juicio" y "Cirugía". La búsqueda fue limitada también a estudios en humanos, lengua inglesa y revistas dentales.The aim of this study is searching the available evidence with respect to the use, justification, side effects and efficacy of corticosteroids in reducing pain and swelling after the surgical extraction of impacted lower third molars. We want to investigate if steroidal anti-inflammatories prescription in addition to non-steroidal anti-inflammatory drugs (NSAID, when compared with the exclusive administration of NSAID, is more effective improving, relieving or eradicating symptoms of swelling and pain after the extraction of the impacted lower third molar. We have utilize in this literature review the Medline database with the keywords "steroids" and "Third molars" or "wisdom molars" and "surgery". The search was also limited to humans, English and dental journals.

I Prieto

2005-10-01

7

Evolución clínica de la pericoronaritis en terceros molares inferiores semirretenidos Clinical evolution of pericoronitis in the third inferior semi-retained molars  

Directory of Open Access Journals (Sweden)

Full Text Available Se realizó un estudio longitudinal, prospectivo, analítico y descriptivo, con el objetivo de determinar la evolución clínica de la pericoronaritis en terceros molares inferiores semirretenidos, patología que aqueja a un porciento elevado de la población, siendo importante su diagnóstico y tratamiento oportuno. Esta investigación se desarrolló en el Hospital General Docente Abel Santamaría Cuadrado, durante el período comprendido de enero a octubre de 2009. La muestra estuvo compuesta por 52 pacientes que asistieron a la consulta de cirugía maxilofacial, por presentar síntomas y signos clínicos propios de la pericoronaritis. Para el análisis estadístico se utilizaron como principales medidas los números absolutos y relativos, y las pruebas no paramétricas de ji cuadrado; se tomó como nivel de significación á-0,005. En los pacientes con pericoronaritis de terceros molares inferiores semirretenidos, la forma serosa fue la más frecuente con un 48%, siendo el dolor moderado el síntoma clínico de mayor incidencia en esta pericoronaritis, no así en la forma supurada, que en el 42,3% existía un dolor severo. Como otros síntomas clínicos presentes, surgieron la inflamación y enrojecimiento del tejido pericoronario en el 100% de los casos, seguido del trismo en un 86,53% y la presencia de pus en un 22%, que se hicieron más notables en la forma supurada de la pericoronaritis.A longitudinal, prospective, analytic and descriptive study was conducted aimed at determining the clinical evolution of pericoronitis in the third inferior semi-retained molars, a pathology that affects a high percent of the population, where the diagnosis and appropriate treatment is very important. This research was carried out from January to October 2009 at "Abel Santamaria Cuadrado" University Hospital. The sample was comprised of 52 patients attending to the oral offices presenting clinical signs and symptoms of pericoronitis. Absolute and relative numbers, parametric chi-square test and the level of significance á- 0,005 were used to perform the statistical analysis. In patients presenting pericoronitis in the third inferior semi-retained molars were found: the serous form that was the most frequent with 48%, being the moderate pain the clinical symptoms that showed the highest incidence in this pericoronitis, that differed from the suppurated which presented 42,3% of severe pain. Other clinical symptoms suggested inflammation and flare of the pericoronary tissue in 100% of the cases, followed by trismus in 86, 53% and the presence of pus (22%, which were more notable in the suppurated form of pericoronitis.

Felicia C Morejón Álvarez

2010-06-01

8

Precisão e confiabilidade de um localizador apical na odontometria de molares inferiores: estudo in vitro  

Directory of Open Access Journals (Sweden)

O coeficiente de correlação linear de Pearson revelou alta concorcândia inter–operadores e intraoperadores. Para comparação do CT1, CT2 e CT3 foi aplicado o Teste t de Student para amostras pareadas (p < 0,05, que não mostrou diferenças significativas entre todas as medidas odontométricas para os canais radiculares MV (p = 0,22 e D (p = 0,94. Portanto, o LAE testado mostrou-se preciso e confiável na determinação da odontometria de molares inferiores.

BritoJúnior, Manoel et al.

2007-01-01

9

Cirugía de rescate (reubicación quirúrgica) en segundos molares inferiores impactados / Rescue surgery (surgical repositioning) of impacted lower second molars  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: Spanish Abstract in spanish La impactación de los segundos molares inferiores es una complicación de la erupción dentaria muy infrecuente, dado que su incidencia se cifra de un 0,03 a un 0,21 %. Se ha detectado en mayor frecuencia de forma unilateral que bilateral y es más usual en mandíbula que en maxilar. Presenta una ligera [...] predicción por el sexo masculino, y la inclinación mesial es la más habitual. Se han publicado una amplia variedad de aproximaciones terapéuticas, fundamentalmente apelando a técnicas quirúrgicas únicas o ayudadas de técnicas ortodóncicas, con el objeto de llevar al diente a su correcta posición, y que se engloban bajo el concepto de cirugía de rescate. En los casos resueltos con una reubicación del diente impactado, la extracción profiláctica del germen se ha propugnado como obligatoria. Presentamos el caso de una paciente de 12 años y 6 meses derivado al Master de Cirugía Bucal de la Universidad de Sevilla por presentar falta de erupción del segundo molar inferior izquierdo. El paciente fue derivado por su ortodoncista, quien detecta la impactación del diente, antes de iniciar el tratamiento ortodóncico. Dicho compañero nos indica que, si es posible, no extraigamos el germen del tercer molar, pues prevé que será viable su erupción en el futuro (dispondrá de espacio en la arcada suficiente). Medidos los espacios de que disponemos, decidimos intentar la reubicación del diente impactado sin extraer el germen del cordal, que se llevó a cabo de forma exitosa. Abstract in english The impaction of lower second molars, given that its incidence is 0.03 to 0.21%, is a rare complication in tooth eruption. It has been detected more often in unilateral form than bilateral and is more common in the mandible than in the maxillary. It has a slight predilection for males, and mesial in [...] clination is more usual. A wide variety of therapeutic approaches have been published, basically referring to surgical techniques, independent or complemented by means of orthodontic technical aids, with the aim of placing the tooth in the correct position, and which are encompassed under the concept of surgical rescue. In cases resolved with repositioning of an impacted tooth, prophylactic root extraction has been proposed as obligatory. We present a case of a 12 and a half year old patient referred to the University of Seville due to non-eruption of the left lower second molar. The patient was referred by her orthodontist, who detected the impaction before starting orthodontic treatment. The orthodontist requested that, if it was possible, we did not extract the root of the third molar, because its eruption would be feasible in the future (there would be sufficient space in the arch). The spaces available were measured and we decided to attempt the repositioning of the impacted tooth without extracting the root of the wisdom tooth, which was carried out successfully.

Manuel, García Calderón; Daniel, Torres Lagares; Maribel, González Martín; José Luis, Gutiérrez Pérez.

10

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

Directory of Open Access Journals (Sweden)

Full Text Available 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 oblíqua. 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.

Borghetti, Ruchielli Loureiro et al.

2010-01-01

11

Valoración de la presencia y estado de erupción del tercer molar inferior en las fracturas del ángulo mandibular  

Directory of Open Access Journals (Sweden)

Full Text Available Se realizó un estudio prospectivo de 176 pacientes con fractura de mandíbula en el Servicio de Cirugía Maxilofacial del Hospital Provincial Docente «Saturnino Lora» de Santiago de Cuba, durante los años 1990-1995, con la finalidad de analizar la posible interrelación entre las fracturas del ángulo y la presencia y estado de erupción del tercer molar inferior. Se pudo comprobar que la incidencia de dichas fracturas era de gran significación cuando los terceros molares inferiores no erupcionados se hallaban presentes, que había una predisposición más marcada a la fractura del ángulo cuando ésta se producía bilateralmente, así como también que el tercer molar inferior no erupcionado debilitaba el ángulo de la mandíbula, tanto cualitativa como cuantitativamente; o sea, se demostró una relación directa entre la cantidad de espacio óseo ocupado por el tercer molar inferior no erupcionado y la debilidad del área del hueso.A prospective study was performed in 176 patients presenting mandibular factures, treated in Maxillofacial Surgery Service of «Saturnino Lora» Teaching Provincial Hospital, Santiago de Cuba (1990-1995, to analyse possible interrelation between angle fractures and presence and state of eruption of inferior third molars. We check out that incidence of such fractures was significant when non-erupted inferior third molars were present, a remarkable predisposition against angle fracture when this one was bilateral, as well as that non-erupted inferior third molars weakened mandibular angle, both qualitatively as quantitatively; that is, a direct relationship between amount of bone space, occupied by non erupted inferior third molar and weakness of bone area was proved.

José Manuel Díaz Fernández

1998-12-01

12

Valoración de la presencia y estado de erupción del tercer molar inferior en las fracturas del ángulo mandibular  

Scientific Electronic Library Online (English)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish Se realizó un estudio prospectivo de 176 pacientes con fractura de mandíbula en el Servicio de Cirugía Maxilofacial del Hospital Provincial Docente «Saturnino Lora» de Santiago de Cuba, durante los años 1990-1995, con la finalidad de analizar la posible interrelación entre las fracturas del ángulo y [...] la presencia y estado de erupción del tercer molar inferior. Se pudo comprobar que la incidencia de dichas fracturas era de gran significación cuando los terceros molares inferiores no erupcionados se hallaban presentes, que había una predisposición más marcada a la fractura del ángulo cuando ésta se producía bilateralmente, así como también que el tercer molar inferior no erupcionado debilitaba el ángulo de la mandíbula, tanto cualitativa como cuantitativamente; o sea, se demostró una relación directa entre la cantidad de espacio óseo ocupado por el tercer molar inferior no erupcionado y la debilidad del área del hueso. Abstract in english A prospective study was performed in 176 patients presenting mandibular factures, treated in Maxillofacial Surgery Service of «Saturnino Lora» Teaching Provincial Hospital, Santiago de Cuba (1990-1995), to analyse possible interrelation between angle fractures and presence and state of eruption of i [...] nferior third molars. We check out that incidence of such fractures was significant when non-erupted inferior third molars were present, a remarkable predisposition against angle fracture when this one was bilateral, as well as that non-erupted inferior third molars weakened mandibular angle, both qualitatively as quantitatively; that is, a direct relationship between amount of bone space, occupied by non erupted inferior third molar and weakness of bone area was proved.

José Manuel, Díaz Fernández; Ricardo, Pérez Arredondo; María de los A., Rodríguez Pérez; Maribel, Ruiz Pérez.

13

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

Scientific Electronic Library Online (English)

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

14

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish 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 preo [...] peratorio 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. Abstract in english 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; Rodolfo, Velázquez Blez²; Hilario, Alfonso Reyes³.

15

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish 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 preo [...] peratorio 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. Abstract in english 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; Rodolfo, Velázquez Blez²; Hilario, Alfonso Reyes³.

1996-08-01

16

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

Directory of Open Access Journals (Sweden)

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

17

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

Scientific Electronic Library Online (English)

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

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

18

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

Science.gov (United States)

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

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

2014-01-01

19

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  

Directory of Open Access Journals (Sweden)

Full Text Available 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 cavo-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.

Harb, Leandro José Corrêa et al.

2010-01-01

20

Sintesi sulla morfometria del primo molare inferiore nel gruppo Microtus (Terricola savii  

Directory of Open Access Journals (Sweden)

Full Text Available Microtus (Terricola savii è distribuito su quasi tutta la penisola italiana e la Sicilia. La sottospecie brachycercus, descritta su esemplari della Sila (Calabria, risulta essere buona specie da studi cromosomici. È stata testata la morfometria del primo molare inferiore tramite 27 variabili considerando 55 (di cui 2 fossili popolazioni di M. savii (1351 denti e 7 di Terricola calabresi (221 denti. Se il numero di denti risultava basso si sono raggruppate più popolazioni quando possibile. Sugli assi dell?analisi discriminante è interessante notare come, benché vi siano somiglianze tra popolazioni che seguono una logica geografica, altre popolazioni vicine geograficamente risultano molto distanti dal punto di vista morfologico e somigliano per contro a popolazioni differenti sia per posizione geografica che situazioni ecologiche. È noto nelle arvicole il fenomeno per il quale una determinata specie, oltre ai morfotipi dentari ad essa tipici, ne possiede altri simili se non identici a quelli di altre specie (serie di Vavilov. Lo stesso fenomeno è osservabile a livello di popolazione nello studio da noi effettuato. Interessanti anche le posizioni marginali di alcune popolazioni come Lotrago di Romagnano (VR, Zelarino (VE, Valle Millecampi (VE, Nonantola (MO, Imola-Romitorio (BO/RA, Monti della Tolfa (RM, Torre del Greco (NA, Melissano (LE, Monteparano (TA, Fontasala (TP, Roccapalumba (PA. Considerando infine nell?insieme tutte le popolazioni di savii e Terricola calabresi, dall?analisi della varianza si riscontrano differenze significative in: lunghezza relativa della parte anteriore (p<0.0001; med 51.126 sav, 50.324 cal, inclinazione rombo pitimiano (p<0.0001; med -0.018 sav, ?0.043 cal, strozzatura cappio anteriore (p<0.0001; med 25.694 sav, 29.704 cal, V6/V21 (p<0.0001; med 2.582 sav, 2.509 cal, (V10-V9/V6 (p<0.0001; med 13.915 sav, 13.040 cal, (V12-V10/V6 (p<0.0001; med 2.180 sav, 2.678 cal, (V12-V11/V6 (p 0.0080; med 15.788 sav, 15.504 cal; (V18-V17/V21*100 (p<0.0001; med ?5.149 sav, ?8.503 cal, (V19- V17/V21*100 (p 0.0043; med 2.161 sav, 2.658 cal, spessore rombo pitimiano (p<0.0001; med 0.159 sav, 0.170 cal; V26/V27 (p 0.0005; med 37.773 sav, 38.326 cal, non significative invece le differenze nella lunghezza totale (p 0.4209, (V11- V9/V6 (p 0.3558, (V20-V19/V21*100 (p 6579. Sugli assi discriminanti la separazione tra i due gruppi non è molto evidente, solo sugli assi 1 e 3 le popolazioni calabresi (eccetto Belvedere Sup. CZ hanno una posizione un po? più marginale.

Armando Nappi

2003-10-01

 
 
 
 
21

Comparison of infiltration and inferior alveolar block anesthesia techniques in controlling pulpotomy pain in the primary mandibular first molars  

Directory of Open Access Journals (Sweden)

Full Text Available Introduction: Pain control is of utmost importance in all dentistry fields. Anesthetic injection is perhaps the most difficult part of treatment in children. The most common anesthesia technique in the mandible is the inferior alveolar nerve block. As the block injection has a lasting anesthetic effect in children and also might cause traumatic injuries to soft tissues a different injection technique is needed. This study compared infiltration and block techniques for pain control during pulpotomy in the primary first mandibular molars.Materials and Methods: In this clinical study forty 5-8 year-old children were chosen. The subjects needed bilateral pulpotomy of primary mandibular first molars. This study was conducted based on a cross-over design. The patients were randomly divided into two groups. The patients in group A received an infiltration injection on the right side and a block injection on the left during the first and second sessions, respectively. The patients in group B received a block injection on the right side and an infiltration injection on the left during the first and second sessions, respectively. The patient pain was recorded at the moment of injection and on pulp exposure based on SEM (Sound Eye Molar scale. Data was analyzed by Mann-Whitney U and Wilcoxon signed-rank tests. Statistical significance was defined at ? = 0.05.Results: The results showed that at the moment of injection the SEM in the infiltration technique was significantly lower than that in the block technique, which demonstrates that the child can better tolerate the pain in the infiltration injection (p value < 0.001. However, the two techniques did not show significant differences in pulpal anesthesia based on the SEM scale.Conclusion: It seems the infiltration technique is superior to the block technique in controlling pain during pulpotomy in the mandibular primary first molars in 5-8 year-old children. Key words: Inferior alveolar nerve block, Infiltration anesthesia, Pulpotomy, SEM Scale, Pain control.

Adeleh Pooyafard

2011-01-01

22

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  

Scientific Electronic Library Online (English)

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

23

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  

Scientific Electronic Library Online (English)

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.

24

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)

25

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

Directory of Open Access Journals (Sweden)

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

David Normando

2010-12-01

26

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

Scientific Electronic Library Online (English)

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

David, Normando; Cristina, Cavacami.

27

Correlation of panoramic radiographs and spiral CT scan in the preoperative assessment of intimacy of the inferior alveolar canal to impacted mandibular third molars.  

Science.gov (United States)

Iatrogenic origin of neurosensory dysfunction is a distressing sequel to the surgical removal of impacted mandibular third molars, which is frequently overlooked. According to various surveys, the rate of neurologic complications related to the surgical removal of impacted mandibular third molars varies between 0.5% and 1% for permanent damage and 5% and 7% involving temporary damage. Prevention always stands as the best modality to avoid patient's discomfort and lawsuits by sophisticated consumerism.Preoperative assessment of the topographic relationship of the impacted mandibular third molar to the inferior alveolar canal has been performed by different imaging modalities. However, none of the imaging techniques give cent percent information. The best available imaging modality in time and resources should be adopted by the surgeon to avoid complications and lawsuits. Orthopantomography has often been cited as the imaging modality of choice before surgical removal of impacted mandibular third molar. However, it depicts a two-dimensional view of an intricate three-dimensional anatomic relationship and also fails to accurately project the buccolingual relation between the tooth and the inferior alveolar canal. The current study was designed to evaluate the potential advantages of spiral computed tomography and compare its efficacy as a presurgical planning tool with orthopantomography in patients with impacted mandibular third molars showing proximity to the inferior alveolar canal on an orthopantomogram. PMID:21403569

Khan, Imran; Halli, Rajshekhar; Gadre, Pushkar; Gadre, Kiran S

2011-03-01

28

Surgical extraction of lower third molars: diagnostic tests and operative technique in the prevention of inferior alveolar nerve injury. Case study  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Increased knowledge and technical refinement have broadened the limits of outpatient oral surgery; however, these changes have at the same time led to a greater number of complications and poor outcomes and, accordingly, to legal action for professional responsibility. Oral surgery represents 10% of all actions, and almost all of these are attributable to exodontic surgery, of which around a third are related to inferior alveolar nerve injury following the extraction of lower third molars.

Meleo, D.; Pacifici, L.

2008-01-01

29

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

Science.gov (United States)

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

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

2014-01-01

30

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

Scientific Electronic Library Online (English)

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

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

31

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish 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. Abstract in english 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 clinic [...] al 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.

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

32

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish 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. Abstract in english 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 clinic [...] al 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.

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

2011-03-01

33

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

Scientific Electronic Library Online (English)

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

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

2012-12-01

34

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

Scientific Electronic Library Online (English)

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

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

35

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

Scientific Electronic Library Online (English)

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.

36

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  

Directory of Open Access Journals (Sweden)

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

S. Olate

2012-12-01

37

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  

Scientific Electronic Library Online (English)

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.

38

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

Scientific Electronic Library Online (English)

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

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

39

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

Scientific Electronic Library Online (English)

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

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

2013-03-01

40

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  

Scientific Electronic Library Online (English)

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

 
 
 
 
41

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

Directory of Open Access Journals (Sweden)

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

42

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  

Scientific Electronic Library Online (English)

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.

43

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  

Scientific Electronic Library Online (English)

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

44

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  

Scientific Electronic Library Online (English)

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.

45

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  

Scientific Electronic Library Online (English)

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

46

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  

Scientific Electronic Library Online (English)

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.

47

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  

Scientific Electronic Library Online (English)

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

48

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

Scientific Electronic Library Online (English)

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

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

49

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  

Directory of Open Access Journals (Sweden)

Full Text Available 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.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 selecionados 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.

Carla Renata Sipert

2006-01-01

50

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

Scientific Electronic Library Online (English)

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.

51

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

Scientific Electronic Library Online (English)

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

52

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

Energy Technology Data Exchange (ETDEWEB)

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

Atihe, Mauricio Martins

2002-07-01

53

Cornual molar ectopic pregnancy  

Directory of Open Access Journals (Sweden)

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

54

Endodontic treatment of molars  

Directory of Open Access Journals (Sweden)

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

Stürzlinger, Heidi

2006-02-01

55

Hipomineralização molar-incisivo  

Directory of Open Access Journals (Sweden)

Full Text Available A hipomineralização-molar incisivo (HMI é um defeito de origem sistêmica no esmalte dentário de primeiros molares e incisivos permanentes. Nesta condição, o esmalte hipomineralizado é frágil e pode se destacar facilmente, deixando a dentina exposta e causando, assim, problemas como sensibilidade dentária e maior risco ao estabelecimento de lesões de cárie. A HMI é freqüentemente confundida com fluorose ou amelogênese imperfeita e sua prevalência varia de 3,6 a 25%. Vários fatores etiológicos são citados para a condição e estão freqüentemente relacionados com doenças na infância nos primeiros três anos de vida. O tratamento envolve desde a restauração dos dentes afetados com materiais adesivos ou até mesmo a extração dos mesmos, dependendo da severidade do caso.

Basso, Ana Paula et al.

2007-01-01

56

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

Energy Technology Data Exchange (ETDEWEB)

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

57

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

International Nuclear Information System (INIS)

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

58

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

Scientific Electronic Library Online (English)

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

Samer Abdel, Nour Khoury; Gloria, Marín Manso; Maiyelín, Llanes Rodríguez; Yulenia, Cruz Rivas.

2008-12-01

59

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

Directory of Open Access Journals (Sweden)

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

Samer Abdel Nour Khoury

2008-12-01

60

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  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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)...

Penna, Luiz Alberto Pla?cido; Rode, Sigmar Mello

2000-01-01

 
 
 
 
61

Embarazo molar repetido: Caso clínico  

Directory of Open Access Journals (Sweden)

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

Leonor Zapata

2002-03-01

62

Embarazo molar repetido: Caso clínico  

Scientific Electronic Library Online (English)

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

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

63

Estudo morfológico da polpa de molares de ratos Wistar frente a uma oclusão traumática experimental  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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)...

Penna, Luiz Alberto Pla?cido; Rode, Sigmar Mello

2000-01-01

64

Inferior vestibular neuritis.  

Science.gov (United States)

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

Kim, Ji-Soo; Kim, Hyo Jung

2012-08-01

65

Molar aspirado al árbol traqueobronquial  

Directory of Open Access Journals (Sweden)

Full Text Available Se reporta el caso de una niña de 11 años con neumonías a repetición focalizadas en el mismo segmento pulmonar. Refería antecedente de exodoncia con aspiración del molar dos años antes, que coincidía con el inicio de las infecciones pulmonares. En el último episodio se sospecha y comprueba la presencia de un molar en lóbulo medio, que se extrae por bronscoscopia rígida, sin complicaciones.

JUAN CAMILO OSPINA GARC\\u00CDA

2011-01-01

66

Extrações de molares na Ortodontia / Molar extractions in orthodontics  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese O tratamento ortodôntico com extração de molares em pacientes adultos é tecnicamente mais complexo, devido a inúmeros fatores. Em geral, o espaço a ser fechado é maior do que o espaço dos pré-molares e, por isso, a ancoragem é crítica e o tempo de tratamento mais longo. É comum esses casos apresenta [...] rem algum grau de comprometimento periodontal por causa da idade dos pacientes e, portanto, necessitam de maior controle da mecânica ortodôntica para reduzir os efeitos colaterais do fechamento do espaço. Por isso, bons resultados de finalização são mais difíceis de ser alcançados. Sendo assim, este artigo tem como objetivo apresentar as razões para a indicação de extração de molares nos tratamentos ortodônticos, as contraindicações, as diferentes fases da mecânica ortodôntica, esclarecer os fatores envolvidos nesse tipo de planejamento e tratamento e apresentar casos clínicos tratados com extração de molares. Abstract in english Orthodontic treatment with extraction of molars in adult patients is technically more complex due to a number of factors. In general, the space to be closed is greater than premolar spaces rendering critical anchorage and longer treatment time. Often such cases exhibit some degree of periodontal inv [...] olvement due to patient age. Hence, the need for greater control over orthodontic mechanics to reduce the side effects of space closure. Therefore, good finishing results can be more difficult to achieve. Thus, the purpose of this article is to determine the reasons for molar extraction indications, describe different stages of orthodontic mechanics, and explain the issues involved in this kind of planning and treatment. Additionally, it aims at describing some treatments with molar extractions.

Marco Antônio, Schroeder; Daniela Kimaid, Schroeder; Diego Júnior Silva, Santos; Michelle Machado, Leser.

67

Extrações de molares na Ortodontia Molar extractions in orthodontics  

Directory of Open Access Journals (Sweden)

Full Text Available O tratamento ortodôntico com extração de molares em pacientes adultos é tecnicamente mais complexo, devido a inúmeros fatores. Em geral, o espaço a ser fechado é maior do que o espaço dos pré-molares e, por isso, a ancoragem é crítica e o tempo de tratamento mais longo. É comum esses casos apresentarem algum grau de comprometimento periodontal por causa da idade dos pacientes e, portanto, necessitam de maior controle da mecânica ortodôntica para reduzir os efeitos colaterais do fechamento do espaço. Por isso, bons resultados de finalização são mais difíceis de ser alcançados. Sendo assim, este artigo tem como objetivo apresentar as razões para a indicação de extração de molares nos tratamentos ortodônticos, as contraindicações, as diferentes fases da mecânica ortodôntica, esclarecer os fatores envolvidos nesse tipo de planejamento e tratamento e apresentar casos clínicos tratados com extração de molares.Orthodontic treatment with extraction of molars in adult patients is technically more complex due to a number of factors. In general, the space to be closed is greater than premolar spaces rendering critical anchorage and longer treatment time. Often such cases exhibit some degree of periodontal involvement due to patient age. Hence, the need for greater control over orthodontic mechanics to reduce the side effects of space closure. Therefore, good finishing results can be more difficult to achieve. Thus, the purpose of this article is to determine the reasons for molar extraction indications, describe different stages of orthodontic mechanics, and explain the issues involved in this kind of planning and treatment. Additionally, it aims at describing some treatments with molar extractions.

Marco Antônio Schroeder

2011-12-01

68

Extrações de molares na Ortodontia / Molar extractions in orthodontics  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese O tratamento ortodôntico com extração de molares em pacientes adultos é tecnicamente mais complexo, devido a inúmeros fatores. Em geral, o espaço a ser fechado é maior do que o espaço dos pré-molares e, por isso, a ancoragem é crítica e o tempo de tratamento mais longo. É comum esses casos apresenta [...] rem algum grau de comprometimento periodontal por causa da idade dos pacientes e, portanto, necessitam de maior controle da mecânica ortodôntica para reduzir os efeitos colaterais do fechamento do espaço. Por isso, bons resultados de finalização são mais difíceis de ser alcançados. Sendo assim, este artigo tem como objetivo apresentar as razões para a indicação de extração de molares nos tratamentos ortodônticos, as contraindicações, as diferentes fases da mecânica ortodôntica, esclarecer os fatores envolvidos nesse tipo de planejamento e tratamento e apresentar casos clínicos tratados com extração de molares. Abstract in english Orthodontic treatment with extraction of molars in adult patients is technically more complex due to a number of factors. In general, the space to be closed is greater than premolar spaces rendering critical anchorage and longer treatment time. Often such cases exhibit some degree of periodontal inv [...] olvement due to patient age. Hence, the need for greater control over orthodontic mechanics to reduce the side effects of space closure. Therefore, good finishing results can be more difficult to achieve. Thus, the purpose of this article is to determine the reasons for molar extraction indications, describe different stages of orthodontic mechanics, and explain the issues involved in this kind of planning and treatment. Additionally, it aims at describing some treatments with molar extractions.

Marco Antônio, Schroeder; Daniela Kimaid, Schroeder; Diego Júnior Silva, Santos; Michelle Machado, Leser.

2011-12-01

69

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.

70

Relation between mandibular third molar and mandibular canal assessed by computed tomography  

International Nuclear Information System (INIS)

During the removal of the mandibular third molar, the inferior alveolar nerve in the canal sometimes damaged. To avoid this complication, it is necessary to understand the positional relationship between the mandibular third molar and the mandibular canal. We evaluated the relationship between the mandibular 3rd molar and the mandibular canal with panoramic X-p and computed tomography (CT). Eighty-six (50.0%) mandibular canals were buccal type, 64 were inferior type, 18 were lingal type, and 4 were between the roots type on CT findings. 137 (79.7%) canal pattern were round type, 35 were flatness type. 109 (63.4%) presence of bone were interposition type, 63 were non-interposition type. Among 172 third molar extraction, hypesthesia of lower lip was observed in 3 cases and inferior alveolar nerve was exposed in 3 teeth. There was no overlap between hypesthesia and nerve exposure. CT provides useful information to surgeons regarding the relationship between the mandibular third molar and the mandibular canal. (author)

71

Mini-implants: mechanical resource for molars uprighting  

Directory of Open Access Journals (Sweden)

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

Susiane Allgayer

2013-02-01

72

Histological evaluation of mandibular third molar roots retrieved after coronectomy.  

Science.gov (United States)

There is a resurgence of interest in coronectomy for the management of mandibular third molars because it has a low risk of injury to the inferior dental nerve. However, there is concern that the root that is left in place will eventually become a source of infection. We describe the histological evaluation of 26 consecutive symptomatic coronectomy roots in 21 patients. All roots had vital tissue in the pulp chamber and there was no evidence of periradicular inflammation. Persistent postoperative symptoms related predominantly to inflammation of the soft tissue, which was caused by partially erupted roots or failure of the socket to heal. PMID:24684971

Patel, Vinod; Sproat, Chris; Kwok, Jerry; Beneng, Kiran; Thavaraj, Selvam; McGurk, Mark

2014-05-01

73

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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

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

1991-01-01

74

Anesthetic technique for inferior alveolar nerve block: a new approach  

Directory of Open Access Journals (Sweden)

Full Text Available 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. 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

2011-02-01

75

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

76

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.

77

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

Scientific Electronic Library Online (English)

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

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

78

Anaesthetic Challenges in Molar Pregnancy  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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

Ghansham Biyani; Sadik Mohammed; Pradeep Bhatia

2013-01-01

79

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

Scientific Electronic Library Online (English)

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

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

80

Luxatio erecta: Inferior glenohumeral dislocation  

Directory of Open Access Journals (Sweden)

Full Text Available Inferior dislocation of the shoulder, also called luxatio erecta, is a rare form of the otherwise common shoulder dislocation. It accounts for less than 0.5% of all shoulder dislocations. A case involving the inferior dislocation of the shoulder is reported. A brief review of the presentation and management of the condition is described.

Baba Asif

2007-01-01

 
 
 
 
81

Anaesthetic Challenges in Molar Pregnancy  

Directory of Open Access Journals (Sweden)

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

Ghansham Biyani

2013-06-01

82

Anaesthetic Challenges in Molar Pregnancy  

Directory of Open Access Journals (Sweden)

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

Ghansham Biyani

2013-06-01

83

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  

Directory of Open Access Journals (Sweden)

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

84

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.

85

[On eruption of mandibular third molar after extraction of mandibular first or second molar].  

Science.gov (United States)

In the orthodontic practice, the first or second molars are extracted by reason of a necessity based on the treatment planning. In these cases, it is desirable that the third molar would be taken part in the masticatory function. This study was made to investigate the natural movement of the erupting third molars after the extraction of the first or second molar on the serial lateral cephalometric radiographs and orthopantomographs. Subjects were divided into three groups. The first is the group which the mandibular second molars were extracted. The second is the group which the first molars were extracted bringing about the successful eruption of the third molars. The third is the group which the first molars were extracted with resultant in the failure of the third molar eruption. In all cases, the orthodontic forces were not applied to the third molars. The results were as follows: 1. In the first group, all third molars were successfully erupted and a lot of the spaces after the extraction of second molars were utilized for the eruption of third molars. 2. In the second group, all third molars were successfully erupted and a lot of the spaces after the extraction of first molars were utilized for the mesial movement of the second molars. 3. In the third group, there were various patterns of the impaction of the third molars. It was suggested that the eruption of the third molar was related to the space distal to the second molar but it was not related to the anterio-posterior length of the mandibular body significantly. PMID:2133887

Yamabe, K; Kouguchi, M; Watanabe, Y; Yamauchi, K

1990-08-01

86

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.

87

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

88

MB2 in maxillary second molar  

Directory of Open Access Journals (Sweden)

Full Text Available Occurrence of the second mesiobuccal canal (MB2 is a frequent finding. Literary reports have shown it to be found more in the cases of the maxillary first molar. However the maxillary second molars have also been found with this variation in a number of canals. This paper presents a case report on the occurrence of a second mesiobuccal canal or the MB2 in the maxillary second molar.

Prakash R

2007-01-01

89

Permanent molars: Delayed development and eruption  

Directory of Open Access Journals (Sweden)

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

Arathi R

2006-05-01

90

Prevalence and Pattern of Third Molar Impaction  

Science.gov (United States)

Objectives: The aim of this retrospective study was to investigate the prevalence and pattern of third molar impaction in patients between 19–26 years old attending Sultan Qaboos University Hospital (SQUH) in Muscat, Oman. Methods: The study reviewed 1,000 orthopantomograms (OPGs) of patients attending the Oral Health Department of SQUH between October 2010 and April 2011. Patients were evaluated to determine the prevalence of third molar impaction, angulation, level of eruption and associated pathological conditions. Results: Of the study population, 543 (54.3%) OPGs showed at least one impacted third molar. The total number of impacted molars was 1,128. The most common number of impacted third molars was two (41%). The most common angulation of impaction in the mandible was the mesioangular (35%) and the most common level of impaction in the mandible was level A. Of the 388 bilateral occurrences of impacted third molars, 377 were in the mandible. There was no significant difference in the frequency of impaction between the right and left sides of both jaws. Pathological conditions associated with impacted lower third molars were found in 18%, of which 14% were associated with a radiographic radiolucency of more than 2.5 mm, and 4% of impacted lower third molars were associated with dental caries. Conclusion: This study found that more than half of Omani adult patients ranging in age from 19–26 years had at least one impacted third molar. PMID:25097776

Al-Anqudi, Samira M.; Al-Sudairy, Salim; Al-Hosni, Ahmed; Al-Maniri, Abdullah

2014-01-01

91

Association between Peritonsillar Abscess and Molar Caries  

Directory of Open Access Journals (Sweden)

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

M Shayani Nasab

2006-05-01

92

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

International Nuclear Information System (INIS)

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

93

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

Scientific Electronic Library Online (English)

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

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

94

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

Scientific Electronic Library Online (English)

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

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

2010-09-01

95

Acute inflammation at a mandibular solitary horizontal incompletely impacted molar  

Directory of Open Access Journals (Sweden)

Full Text Available Minoru Yamaoka, Yusuke Ono, Masahide Ishizuka, Yoko Hasumi-Nakayama, Ryosuke Doto, Kouichi Yasuda, Takashi Uematsu, Kiyofumi FurusawaOral and Maxillofacial Surgery, Matsumoto Dental University School of Dentistry, Shiojiri, Nagano, JapanAbstract: Acute inflammation is frequently seen in the elderly around incompletely impacted molars located apart from molars or premolars. To identify the factors causing acute inflammation in the solitary molars without second molars or without second and first molars, ages of patients and rates of acute inflammation in 75 horizontal incompletely impacted mandibular molars in contact or not in contact with molars in subjects 41 years old or older were studied using orthopantomographs. Acute inflammation was seen in nine third molars out of 48 third molars in contact with second molars (18.8%, whereas acute inflammation was seen in 11 molars out of 19 solitary molars without second molars or without first and second molars (57.9% (p < 0.01. The mean age of 48 subjects with third molars in contact with the second molar was 50.42 ± 7.62 years, and the mean age of 19 subjects with isolated molars was 65.16 ± 10.41 years (p < 0.0001. These indicate that a solitary horizontal incompletely impacted molar leads more frequently to acute inflammation along with aging due to possible bone resorption resulting from teeth loss.Keywords: mandible, third molar, impaction, elderly, acute inflammation, solitary molar

Minoru Yamaoka

2009-04-01

96

Treatment of ectopic first permanent molar teeth.  

LENUS (Irish Health Repository)

Ectopic eruption of the first permanent molar is a relatively common occurence in the developing dentition. A range of treatment options are available to the clinician provided that diagnosis is made early. Non-treatment can result in premature exfoliation of the second primary molar, space loss and impaction of the second premolar. This paper will describe the management of ectopic first permanent molars, using clinical examples to illustrate the available treatment options. CLINICAL RELEVANCE: This paper is relevant to every general dental practitioner who treats patients in mixed dentition.

Hennessy, Joe

2012-11-01

97

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

98

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

Scientific Electronic Library Online (English)

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.

99

Empleo racional de la coronectomía en la extracción de terceros molares incluidos Rational application of coronectomy when treating lower impacted third molar  

Directory of Open Access Journals (Sweden)

Full Text Available Los terceros molares son los dientes que, con más frecuencia, sufren el fracaso de su erupción y quedan incluidos o retenidos dentro de los maxilares. Un gran porcentaje de nuestros pacientes presentan los cordales incluidos y, de ellos, una parte importante se acompaña de patología que hace aconsejable su tratamiento quirúrgico. La técnica de la coronectomía aplicada al tercer molar incluido fue descrita por primera vez por Ecuyer y Debien en 1984 como la eliminación parcial de dicho diente, dejando deliberadamente parte de su raíz en el interior de la mandíbula. Fue propuesta para evitar la lesión del nervio dentario inferior (NDI en aquéllos casos en los que existía una íntima relación entre ambas estructuras anatómicas. Aunque el objetivo de la técnica es muy claro, no está libre de controversia, ya que el cirujano debe valorar la posibilidad de una complicación infecciosa de origen pulpar. Presentamos un caso clínico exitoso de esta técnica, junto al análisis de la postura ante la técnica de los distintos autores, así como sus ventajas e inconvenientes.Third molars are the teeth that most frequently fail to erupt and remain impacted or retained inside the bone. A large percentage of our patients have impacted wisdom teeth and many of these patients also have pathologies that require surgical treatment. Applied coronectomy technique of the impacted third molar was first described by Ecuyer and Debien in 1984. The described it as partial elimination of the tooth in question, deliberately leaving part of the root inside the bone. This was proposed to avoid injuring the inferior dental nerve in cases where there was a close relationship between the two anatomical structures. Although the objective of the procedure is very clear, it is still controversial. Therefore, the surgeon should evaluate the possibility of an infectious complication of pulpar origin. We present the successful clinical case that uses this technique, as well as an analysis of the distinct authors' opinions this technique and its advantages and disadvantages.

C. Recio Lora

2009-08-01

100

Fabrication and Evaluation of a Noncompliant Molar Distalizing Appliance: Bonded Molar Distalizer  

Directory of Open Access Journals (Sweden)

Full Text Available Objective: Attempts to treat class II malocclusions without extraction in non-compliant patients have led to utilization of intraoral molar distalizing appliances. The purpose of this study was to investigate dental and skeletal effects of Bonded Molar Distalizer (BMD which is a simple molar distalizing appliance.Materials and Methods: Sixteen patients (12 girls, four boys with bilateral half-cusp class II molar relationship, erupted permanent second molars and normal or vertical growth pattern were selected for bilateral distalization of maxillary molars via BMD. Thescrews were activated every other day, alternately. Lateral cephalograms and study models were obtained before treatment and after 11 weeks activation of the appliance.Results: Significant amounts of molar distalization, molar distal tipping and anchorage loss were observed. The mean maxillary first molar distal movement was 1.22±0.936 mm with a distal tipping of 2.97±3.74 degrees in 11 weeks. The rate of distal movement was0.48 mm per month. Reciprocal mesial movement of the first premolars was 2.26±1.12 mm with a mesial tipping of 4.25±3.12 degrees. Maxillary incisors moved 3.55±1.46 mm and tipped 9.87±5.03 degrees mesially. Lower anterior face height (LAFH decreased 1.28±1.36 mm.Conclusion: BMD is appropriate for distalizing maxillary molars, especially in patients with critical LAFH, although significant amounts of anchorage loss occur using this appliance.

S. Arab

2011-09-01

 
 
 
 
101

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.

102

Traumatismos de veia cava inferior / Inferior vena cava injuries  

Scientific Electronic Library Online (English)

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

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

103

Traumatismos de veia cava inferior / Inferior vena cava injuries  

Scientific Electronic Library Online (English)

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

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

2005-10-01

104

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

Directory of Open Access Journals (Sweden)

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

R Fuentes

2012-08-01

105

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

106

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

Directory of Open Access Journals (Sweden)

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

107

Traumatismos de veia cava inferior Inferior vena cava injuries  

Directory of Open Access Journals (Sweden)

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

Cleinaldo de Almeida Costa

2005-10-01

108

Coronectomy of a lower third molar in combination with vital pulp therapy.  

Science.gov (United States)

Coronectomy is a procedure that intentionally spares the vital root after removal of the crown of the lower third molar to avoid damage to the inferior alveolar nerve. Vital pulp therapy is one option for managing exposed pulp tissue to reduce the risk of pulpal inflammation or necrosis. Among various dental materials, mineral trioxide aggregate (MTA) has been successfully used for vital pulp therapy. Thus, this case report discusses a coronectomy procedure in combination with vital pulp therapy using MTA. This case also attempts to highlight the formation of tertiary dentin, evidence of successful vital pulp therapy. PMID:25202226

Kim, Young-Bin; Joo, Woo-Hee; Min, Kyung-San

2014-07-01

109

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  

Scientific Electronic Library Online (English)

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

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

2000-06-01

110

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

111

[Pit sealing of deciduous and permanent molars. In vivo evaluation].  

Science.gov (United States)

The authors studied a fissure sealant retention in deciduous molars and first permanent molars. The assessment of the sealant retention was performed at six months intervals. After eighteen months study period a greater sealant on the deciduous molars was observed, in a decreasing order as follow: upper and lower first permanent molars. It was also shown that greatest loss of sealant occurred on the disto occlusal pit of the upper first permanent molars. PMID:2135449

Prado, C; Garone Netto, N

1990-01-01

112

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.

113

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

Directory of Open Access Journals (Sweden)

Full Text Available 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 la 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.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 tinction 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

2007-09-01

114

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.

115

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 ...

116

The position of the mandibular canal and histologic feature of the inferior alveolar nerve.  

Science.gov (United States)

The inferior alveolar nerve is the one of the large branches of the mandibular division of the trigeminal nerve. It is vulnerable during surgical procedures of the mandible. Despite its importance, no anatomical and histological examination has been conducted to provide a detailed cross-sectional morphology of the mandibular canal according to dental status. Therefore, the present study aimed to identify the position of the mandibular canal through direct measurement and to determine the branches of the inferior alveolar nerve through histologic examination. The area between the anterior margin of the third molar and the anterior margin of the second premolar of dentulous, partially dentulous, and edentulous hemimandible specimens (n = 49) from 26 human cadavers was serially sectioned into seven segments, and specific distances were measured using digital calipers. Following this, 5-microm cross-sections were prepared along the mandibular canal and mental foramen, and examined by fluorescence microscopy. The mandibular canal was located at a mean distance of 10.52 mm above the inferior margin of the mandible. The mean maximum diameters of the mandibular canal, inferior alveolar nerve, inferior alveolar artery, and inferior alveolar vein were 2.52, 1.84, 0.42, and 0.58 mm, respectively. This study found that the inferior alveolar nerve often gives rise to several branches at each level (range 0-3). To minimize the risk of injury, knowledge of the small branches of the nerve and of the detailed findings regarding the position of the mandibular canal reported here should be considered when planning mandibular surgery, especially during implant placement. PMID:19918867

Kilic, C; Kamburo?lu, K; Ozen, T; Balcioglu, H A; Kurt, B; Kutoglu, T; Ozan, H

2010-01-01

117

Patients' anxieties with third molar surgery.  

Science.gov (United States)

There has been little study of patients' anxieties about third molar surgery despite its widespread practice. 105 patients were invited to complete questionnaires preoperatively to assess anxieties about the procedure and to assess how well it was explained. They were also asked post operatively to assess differences from expectations, accuracy of the preoperative explanation and which aspect would worry them most should the procedure be repeated. Patients generally found their worries as expected or even better. Few found events worse with only pain (12%) and paraesthesia (13%) of note. Although 88% of patients assessed pain as better than or as expected, 43% would fear it most if the procedure was repeated. Pain is the single most feared factor despite evidence that it is usually no worse than originally feared. Reassurance and adequate pain control are the most important factors to patients in third molar surgery, and this reassurance should start at operation booking rather than on admission. PMID:7999736

Earl, P

1994-10-01

118

Intra-sinusal third molar: Case report  

Directory of Open Access Journals (Sweden)

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

Frederico Sampaio Neves

2011-01-01

119

Ectopic third molar in the maxillary sinus  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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

120

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

Scientific Electronic Library Online (English)

Full Text Available 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

 
 
 
 
121

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

Scientific Electronic Library Online (English)

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

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

2014-01-01

122

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

Scientific Electronic Library Online (English)

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

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

123

Empleo racional de la coronectomía en la extracción de terceros molares incluidos / Rational application of coronectomy when treating lower impacted third molar  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: Spanish Abstract in spanish Los terceros molares son los dientes que, con más frecuencia, sufren el fracaso de su erupción y quedan incluidos o retenidos dentro de los maxilares. Un gran porcentaje de nuestros pacientes presentan los cordales incluidos y, de ellos, una parte importante se acompaña de patología que hace aconsej [...] able su tratamiento quirúrgico. La técnica de la coronectomía aplicada al tercer molar incluido fue descrita por primera vez por Ecuyer y Debien en 1984 como la eliminación parcial de dicho diente, dejando deliberadamente parte de su raíz en el interior de la mandíbula. Fue propuesta para evitar la lesión del nervio dentario inferior (NDI) en aquéllos casos en los que existía una íntima relación entre ambas estructuras anatómicas. Aunque el objetivo de la técnica es muy claro, no está libre de controversia, ya que el cirujano debe valorar la posibilidad de una complicación infecciosa de origen pulpar. Presentamos un caso clínico exitoso de esta técnica, junto al análisis de la postura ante la técnica de los distintos autores, así como sus ventajas e inconvenientes. Abstract in english Third molars are the teeth that most frequently fail to erupt and remain impacted or retained inside the bone. A large percentage of our patients have impacted wisdom teeth and many of these patients also have pathologies that require surgical treatment. Applied coronectomy technique of the impacted [...] third molar was first described by Ecuyer and Debien in 1984. The described it as partial elimination of the tooth in question, deliberately leaving part of the root inside the bone. This was proposed to avoid injuring the inferior dental nerve in cases where there was a close relationship between the two anatomical structures. Although the objective of the procedure is very clear, it is still controversial. Therefore, the surgeon should evaluate the possibility of an infectious complication of pulpar origin. We present the successful clinical case that uses this technique, as well as an analysis of the distinct authors' opinions this technique and its advantages and disadvantages.

C., Recio Lora; D., Torres Lagares; M. de, Maeztu Martínez; M.M., Romero Ruiz; J.L., Gutiérrez Pérez.

124

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.

125

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

126

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

127

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available ... layers of the abdomen. And one of the big differences between the deep inferior epigastric perforator flap ... L. SMITH, MD, FACS: Well, one of the big pluses of the DIEP flap compared to the ...

128

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

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

129

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: ... this side because of her strongly positive family history. And here through a small medial incision we' ...

130

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

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

131

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available ... DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00:00:24 ... some of this tissue with the muscle in order to maintain these perforating vessels intact to the ...

132

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available ... significant amount of breast tissue behind. The incision planning's extremely important so that the blood supply is -- ... usually in that setting, we'll proceed as planned with the deep inferior epigastric perforator technique. 00: ...

133

[Ectopic molar tooth in the maxillary sinus].  

Science.gov (United States)

The development of intranasal ectopic teeth is rare. Although they are more commonly seen in the palate and maxillary sinus, they can also be found in the mandibular condyle, coronoid process, and nasal cavity. A 30-year-old male patient presented with a complaint of headache. Computed tomography of the paranasal sinuses showed a bony mass in the right maxillary sinus wall, 1 cm in size. He did not have any history of maxillofacial trauma or operation. The mass was removed via a Caldwell-Luc procedure. It looked like a tooth. Histopathologic diagnosis was made as ectopic molar tooth. The patient was asymptomatic two weeks after the operation. PMID:18187979

Altun, Hüseyin; Teker, Ay?enur Meriç; Ceran, Murat; Gedikli, Orhan

2007-01-01

134

Molar Pregnancy Presents as Tubal Ectopic Pregnancy  

Directory of Open Access Journals (Sweden)

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

135

The inferior frontal gyrus and cough  

Directory of Open Access Journals (Sweden)

Full Text Available We present a case of a patient with a tumor close to the right inferior frontal gyrus. The only symptom this patient had was a disturbing dry cough. After removal of the tumor the cough disappeared immediately. Review of the literature showed that there is a control center of voluntary cough in the right inferior frontal gyrus. Our case suggests that there might be such a center, which can be affected by a tumor close to it.

Homajoun Maslehaty

2014-03-01

136

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

Scientific Electronic Library Online (English)

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

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

137

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

Directory of Open Access Journals (Sweden)

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

M. Urdaneta Quintero

2009-12-01

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

Radiologic study of mandibular third molar of Korean youths  

Energy Technology Data Exchange (ETDEWEB)

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

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

1982-11-15

140

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

 
 
 
 
141

Molar incisor hypomineralization, prevalence, and etiology.  

Science.gov (United States)

Aim. To evaluate the prevalence and possible etiological factors associated with molar incisor hypomineralization (MIH) among a group of children in Jeddah, Saudi Arabia. Methods. A group of 8-12-year-old children were recruited (n = 267) from the Pediatric Dental Clinics at the Faculty of Dentistry, King Abdulaziz University. Children had at least one first permanent molar (FPM), erupted or partially erupted. Demographic information, children's medical history, and pregnancy-related data were obtained. The crowns of the FPM and permanent incisors were examined for demarcated opacities, posteruptive breakdown (PEB), atypical restorations, and extracted FPMs. Children were considered to have MIH if one or more FPM with or without involvement of incisors met the diagnostic criteria. Results. MIH showed a prevalence of 8.6%. Demarcated opacities were the most common form. Maxillary central incisors were more affected than mandibular (P = 0.01). The condition was more prevalent in children with history of illnesses during the first four years of life including tonsillitis (P = 0.001), adenoiditis (P = 0.001), asthma (P = 0.001), fever (P = 0.014), and antibiotics intake (P = 0.001). Conclusions. The prevalence of MIH is significantly associated with childhood illnesses during the first four years of life including asthma, adenoid infections, tonsillitis, fever, and antibiotics intake. PMID:24949012

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

2014-01-01

142

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

Scientific Electronic Library Online (English)

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

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

143

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

Scientific Electronic Library Online (English)

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

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

2007-09-01

144

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

Scientific Electronic Library Online (English)

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.

145

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

Scientific Electronic Library Online (English)

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

146

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

147

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

148

Partial Invasive Molar Pregnancy –2 Case Reports  

Directory of Open Access Journals (Sweden)

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

Debasmita Mandal

2010-01-01

149

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.

Gerward, Leif

2002-01-01

150

Influence of Unerupted Third Molars on Angle and Condyle Fracture  

Directory of Open Access Journals (Sweden)

Full Text Available Condylar and angle fractures are the most common types of mandibular injuries. There is evidence in the literature suggesting that the presence of unerupted lower third molars increases the risk of angle fracture and reduces the chance of condyle fracture. The present paper reports on a case of a 19-year-old Caucasian man who had bilateral angle fracture associated with the two lower unerupted third molars. No other fracture was detected on the panoramic radiograph. This case suggests that unerupted lower third molars increase the risk of angle fracture whereas preventing condyle fracture. Reduction of the bone mass of the angle in the presence of third molars and disruption of the oblique ridge with partially erupted molars support our fi ndings. As the treatment of condyle fracture is more complex, it might not be appropriate to strengthen the mandibular angle, making the mandible more vulnerable to condylar fractures by means of prophylactic extraction of asymptomatic unerupted third molars.

Sergio Lins de-Azevedo-Vaz

2012-01-01

151

ANOMALOUS ORIGIN OF RIGHT INFERIOR PHRENIC ARTERY  

Directory of Open Access Journals (Sweden)

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

152

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

Scientific Electronic Library Online (English)

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

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

2012-08-01

153

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.

154

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

155

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

Scientific Electronic Library Online (English)

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

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

156

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

Scientific Electronic Library Online (English)

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

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

2013-02-01

157

EMBARAZO ECTÓPICO MOLAR CORNUAL: CASO CLÍNICO  

Directory of Open Access Journals (Sweden)

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

Clara del Carmen Flores Acosta

2010-01-01

158

EMBARAZO ECTÓPICO MOLAR CORNUAL: CASO CLÍNICO  

Scientific Electronic Library Online (English)

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

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

159

First permanent maxillary molar morphology and ideal occlusion.  

Directory of Open Access Journals (Sweden)

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

D. I. Halazonetis

2000-01-01

160

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

 
 
 
 
161

Inferior epigastric artery pseudoaneurysm following trocar injury.  

Science.gov (United States)

Herein is described the development of an inferior epigastric pseudoaneurysm caused by a trocar injury during laparoscopic surgery. After the accessory trocar was placed in the left lower quadrant, the patient's condition became clinically unstable, requiring blood transfusions postoperatively and transfer to our tertiary care center. On arrival, she continued to have pain, with a palpable tender mass in the left lower quadrant. A computed tomography scan revealed a 5 × 6-cm mass in the anterior rectus sheath, with central hyperattenuation. This was better characterized at ultrasonography. The findings were consistent with an unstable pseudoaneurysm from the left inferior epigastric artery, with surrounding hematoma. Urgent embolization was performed by Interventional Radiology using coils inserted distal, into, and proximal to the pseudoaneurysm. The patient's condition was stable after the procedure, and she returned to the referring hospital for convalescence. Pseudoaneurysm of the inferior epigastric artery from a trocar injury is a rare occurrence. This case is the first report of a pseudoaneurysm forming in the inferior epigastric artery resulting from a trocar injury during gynecologic surgery. PMID:22546427

Splinter, Karen L; Cook, Colleen L

2012-01-01

162

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.

163

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

164

Extinction as discrimination: the molar view.  

Science.gov (United States)

The traditional molecular view of behavior explains extinction as the dissipation or inhibition of strength, formerly built up by contiguous reinforcement. In obstinate opposition to this explanation was the partial-reinforcement extinction effect: a partially reinforced response extinguishes more slowly than a continuously reinforced response. It suggests instead that extinction is discrimination. Four pigeons were exposed to daily sessions in which a variable period of food delivery, produced by pecking on a variable-interval schedule, was followed by extinction. The rate of food delivery was varied over a wide range across conditions. Varying the amount of food per delivery inversely with rate of delivery kept response rate from varying excessively. The results confirmed and extended the partial-reinforcement effect; persistence of pecking and time to extinction were inversely related to rate of obtaining food. The results support the molar view of extinction, not as loss of strength of a particular discrete response, but as a transition from one allocation of time among activities to another. Although molecular theories dismiss discrimination due to repeated training and extinction as an impurity or complication, repeated cycles of availability and privation are probably typical of the environment in which most vertebrate species evolved. PMID:22425783

Baum, William M

2012-05-01

165

Clinical decision making on extensive molar restorations.  

Science.gov (United States)

SUMMARY Extensive loss of posterior tooth substance, which traditionally was restored with amalgam or indirect restorations, is more commonly being restored with resin-based composite restorations. Using a questionnaire, we aimed to survey dentists' clinical decision making when restoring extensive defects in posterior molar teeth. The questionnaire, which included questions on background information from the dentists, clinical cases with treatment options, and general questions about restoring extensive posterior defects, was sent to 476 dentists. The response rate was 59%. Multiple logistic regressions were used to investigate the different associations. Most of the respondents preferred a direct composite restoration when one cusp was missing, while indirect restorations were most preferred when replacing three or four cusps. Younger dentists and dentists working in the private sector had a greater tendency to choose an indirect technique compared with older colleagues. Generally, the most important influencing factor in clinical decision making was the amount of remaining tooth substance. Factors that appeared to be less important were dental advertisements, use of fluoride, and dietary habits. Female dentists perceived factors such as oral hygiene, patient requests, and economy to be more important than did their male colleagues. PMID:24828135

Laegreid, T; Gjerdet, Nr; Johansson, A; Johansson, A-K

2014-01-01

166

Incomplete molar pregnancy with live coexisting fetus: a case report  

Directory of Open Access Journals (Sweden)

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

Leila Pourali

2014-03-01

167

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

168

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

Directory of Open Access Journals (Sweden)

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

Mohammad Ebrahimi Saravi

2013-10-01

169

Pulpotomies with portland cement in human primary molars  

Directory of Open Access Journals (Sweden)

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

Taísa Regina Conti

2009-02-01

170

Pulpotomies with portland cement in human primary molars  

Scientific Electronic Library Online (English)

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

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

2009-02-01

171

Sarcoma de vena cava inferior Sarcoma of the vena cava inferior  

Directory of Open Access Journals (Sweden)

Full Text Available Se presentó un caso infrecuente de una paciente con tumor abdominal y gran circulación colateral superficial tipo cava-cava, el ultrasonido abdominal, el ecocardiograma trans-torácico y transesofágico y la tomografía axial computarizada identificaron un tumor de la vena cava inferior. La citología aspirativa con aguja fina de la lesión confirmó que se trataba de un sarcoma fusopleomórfico de alto grado de malignidad primario de la vena cava inferior.Authors present an infrequent case of a female patient with abdominal tumor a great superficial collateral circulation type cava-cava, the abdominal ultrasound, the transthoracic and transesophageal echocardiogram and the computerized axial tomography (CAT identified a tumor of the vena cava inferior. The fine-needle aspiration cytology of lesion confirmed the presence of primary fusopleomorphous sarcoma of high degree of malignancy of vena cava inferior.

Jorge Luis León Álvarez

2010-12-01

172

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.)

173

Leiomyosarcoma of the Inferior Vena Cava  

Science.gov (United States)

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

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

2013-01-01

174

Leiomyosarcoma of the inferior vena cava  

Directory of Open Access Journals (Sweden)

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

Ben Abid Sadri

2013-01-01

175

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

Directory of Open Access Journals (Sweden)

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

176

Inferior Vena Cava Index in Edematous Patients  

Directory of Open Access Journals (Sweden)

Full Text Available Introduction: To find a relation between extracellular over fluid and inferior vena cava index as a noninvasive, cost effective and accessible method .Methods: In a cross sectional study 54 cases (no edema 30, mild and moderate 13 and significant edema 11 cases entered to study. Inferior vena cava index (IVCi measured by difference of inspiration to expiration divided to maximum size multiply by 100, we also find delta ratio as difference of maximum to minimum size of inferior vena cava. All data expressed by rate and ratio, relation of edema severity to IVCi or delta ratio performed by mann whitney and regression test, P less than 0.05 was significant.Results: IVCi in 30 cases with no edema ,13 cases with mild to moderate and 11 cases with significant edema were %46±16 , %42±16 , %38±17, there is a reverse relation of IVCi and edema severity but these relations were not significant (P>0.05 .Averaged Delta ratio(millimeter decreased in severe edema but it was not significant(3.7mm±2 vs. 2.8mm±1.6. Conclusion: In edematous conditions IVCi and delta ratio decrease but these changes are not significant for edema severity estimation.

Shamsi Ghaffari

2012-09-01

177

A Prospective, Randomized, Double-Blind Study of the Anesthetic Efficacy of Sodium Bicarbonate Buffered 2% Lidocaine With 1?:?100,000 Epinephrine in Inferior Alveolar Nerve Blocks  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The authors, using a crossover design, randomly administered, in a double-blind manner, inferior alveolar nerve (IAN) blocks using a buffered 2% lidocaine with 1?:?100,000 epinephrine/sodium bicarbonate formulation and an unbuffered 2% lidocaine with 1?:?100,000 epinephrine formulation at 2 separate appointments spaced at least 1 week apart. An electric pulp tester was used in 4-minute cycles for 60 minutes to test for anesthesia of the first and second molars, premolars, and latera...

Whitcomb, Michael; Drum, Melissa; Reader, Al; Nusstein, John; Beck, Mike

2010-01-01

178

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | 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.

179

A novel technique for inferior rectus recession  

Directory of Open Access Journals (Sweden)

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

Gokyigit B

2014-01-01

180

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

Directory of Open Access Journals (Sweden)

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

Machado, Geovana

2005-01-01

 
 
 
 
181

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

Scientific Electronic Library Online (English)

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.

182

An assessment on the effects of mandibular impacted third molar surgery on the periodontium of the adjacent molar  

Directory of Open Access Journals (Sweden)

Full Text Available Statement of Problem: One of the important indications for the extraction of mandibular impacted third"nmolar is to preserve the periodontal health of the adjacent second molar from the destructive effects of"nplaque accumulation, acute and chronic inflammation."nAim: The purpose of this study was to determine the effect of mandibular third molar surgery on the"nPDL of the adjacent molar."nMaterials and Methods: Thirty patients, referred to the department of maxillofacial surgery, Tehran"nUniversity of Medical Sciences, were selected, based on the desirable conditions. They had no history of"nsystemic diseases and their adjacent molar was healthy. Probing depth (PD at seven points and"nattachment level (AL at three points were measured preoperatively. Standardized periapical"nradiographics were taken regularly for all patients. All the above-mentioned procedures repeated after"nthree months of surgery. Findings were analyzed by Paired t-test."nResults: A significant difference in probing depth (PD was observed before and after surgery, meaning"nthat probing depth decreased after mandibular third molar surgery. Attachment level was also decreased"npost operatively; moreover. Intrabony defects (IBD showed healing after surgery."nConclusion: Considering the limitations of the present study, impacted third molar surgery is suggested"nto prevent periodontal problems of the adjacent molar.

Ramezanian M

2003-06-01

183

Evaluation of the space available for eruption of maxillary second and third molars after distalization of maxillary first molars  

Directory of Open Access Journals (Sweden)

Full Text Available Objective: The objective of this study was to evaluate cephalometrically the space available for eruption of maxillary second and third molars in the region of the maxillary tuberosity after distalization of maxillary permanent first molars.Material and methods: The sample consisted of 38 right lateral cephalograms obtained from 19 Brazilian patients,of Caucasian and African descent, with average age of 9 years and 5 months.Cephalograms were taken before and after distalization of maxillary permanent first molars. The space from the end of the maxillary tuberosity to the distal aspect of the maxillary permanent first molar was evaluated.Student’s t test was applied for the statistical analysis,and the correlation between space and angulation was analyzed by the Pearson correlation coefficient.Results and conclusion:The corresponding space between the distal aspect of maxillary permanent first molars and the end of the maxillary tuberosity, before and after distalization,is not enough for eruption of the maxillary second and third molars.The crowns revealed distal angulation before and after distalization.The correlation of angulation of crowns of maxillary second and third molars and the space for eruption revealed that the greater the distal angulation of crowns,the smaller will be the space available for eruption.

Francisco Alexandre Baptista da Silva

2010-07-01

184

An unusual dilacerated root of a second maxillary molar.  

Science.gov (United States)

An unusual case of a second maxillary molar with a dilacerated root visible clinically is described. Apicectomy followed by retrograde amalgam filling was performed whereby gingival coverage and gingival seal was achieved. PMID:9242118

Ngeow, W C

1996-01-01

185

Alternatives for restoration of a hemisected mandibular molar.  

Science.gov (United States)

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

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

2014-01-01

186

Determining Molar Combining Ratios Using Radioisotopes--A Student Experiment  

Science.gov (United States)

Outlines an experimental procedure in which an iodine radioisotope is used to determine molar combining ratios of lead and silver with the iodine. Tables and graphs show the definitive results that should be attainable. (CP)

Sears, Jerry A.

1976-01-01

187

Iatrogenic Mandibular Fracture Associated with Third Molar Removal  

Directory of Open Access Journals (Sweden)

Full Text Available Third molar extraction is one of the most common procedures performed in oral and maxillofacial surgery units. It is sometimes accompanied by complications such as alveolar osteitis, secondary infection, hemorrhage, dysesthesia and, most severely, iatrogenic fracture. This article describes two mandibular angle fractures that occurred in two patients during the surgical extraction of one erupted and one unerupted third molar, including a brief review of the literature.

Abdulkadir Burak Cankaya, Mehmet Ali Erdem, Sirmahan Cakarer, Muhsin Cifter, Cuneyt Korhan Oral

2011-01-01

188

Partial molar quantity of an intensive mother function.  

Science.gov (United States)

A new formal definition is given to the partial molar quantity of a component i for an intensive mother function. We perturb the entire system by increasing the amount of the target component by ?n(i) keeping others constant and measure the response of the system in terms of an intensive mother function, ?, ??. We then define its partial molar quantity of the ith component, ?(i), as ?(i) = [???{?n(i)?(N + ?n(i))

Koga, Yoshikata

2012-09-28

189

Partial molar quantity of an intensive mother function  

Science.gov (United States)

A new formal definition is given to the partial molar quantity of a component i for an intensive mother function. We perturb the entire system by increasing the amount of the target component by ?ni keeping others constant and measure the response of the system in terms of an intensive mother function, ?, ??. We then define its partial molar quantity of the ith component, ?i, as ?i = [??/{?ni/(N + ?ni)

Koga, Yoshikata

2012-09-01

190

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

191

A bracket design proposal for the first molar  

Directory of Open Access Journals (Sweden)

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

192

Molar exergy and flow exergy of pure chemical fuels  

International Nuclear Information System (INIS)

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

193

Influence of premolar extractions on the facial profile evaluated by the Holdaway analysis / Influência de exodontias de pré-molares no perfil facial avaliada pela análise de Holdaway  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese OBJETIVO: Este trabalho retrospectivo tem como proposta avaliar pacientes tratados com exodontias de pré-molares através de cefalometria em telerradiografia de perfil, comparando o efeito de diferentes protocolos de exodontias no perfil. METODOLOGIA: Oitenta e sete pacientes (31 meninos e 56 meninas [...] ) foram selecionados da clínica particular de três ortodontistas diplomados pelo Board Brasileiro de Ortodontia e Ortopedia Facial. Estes pacientes foram tratados com aparelho fixo Edgewise foram divididos em três grupos, compreendendo a sequência de exodontia de pré-molares empregada Grupo 40 compreendendo 22 pacientes tratados com exodontia de primeiros pré-molares superiores, Grupo 44 compreendendo 43 pacientes tratados com exodontia de quatro primeiros pré-molares e Grupo 45 compreendendo 22 pacientes tratados com exodontia de primeiros pré-molares superiores e segundos inferiores. A Análise de Holdaway foi utilizada para quantificar e comparar os perfis antes e após o tratamento dos grupos. RESULTADOS: O teste t-Student mostrou melhora no perfil em todos os grupos. Quando comparados entre si, ANOVA revelou que apenas a medida sulco lábio inferior em relação à linha H apresentou diferenças nas mudanças incrementais proporcionadas pelo tratamento, em que o grupo 44 apresentou uma diferença significativamente superior ao grupo 40. CONCLUSÃO: A partir dos resultados concluiu-se que os protocolos produzem aparências faciais semelhantes. Abstract in english PURPOSE: This retrospective study aimed at assessing patients treated with extraction of premolars through cephalometry in lateral teleradiography, comparing the effect of different tooth extraction protocols on the facial profile. METHODS: For this study, 87 patients (31 boys and 56 girls) were sel [...] ected from the private practices of three dentists certified by the Brazilian Board of Orthodontics and Facial Orthopedics. These patients were treated with fixed edgewise appliance and divided into three groups, according to the sequence in which premolars were extracted "Group 40" comprised 22 patients treated with extractions of the first two superior premolars, adopted as the control group; "Group 44" comprised 43 patients treated with extractions of the four first premolars; and "Group 45" comprised 22 patients treated with extractions of first superior premolars and second inferior premolars. The Holdaway analysis was used to quantify and compare the group profiles before and after treatment. RESULTS: Student's t-tests showed a profile improvement in all groups. When groups were compared, ANOVA showed that only the Inferior sulcus to the H line showed differences in incremental changes resulting from the treatment. Group 44 showed a significantly higher difference than Group 40. CONCLUSION: We conclude that the protocols produce similar facial appearances.

Susiane, Allgayer; Eduardo M. Santayana de, Lima; Maurício Barbieri, Mezomo.

194

Effects of Gates-Glidden, LA Axxess and orifice shaper burs on the cervical dentin thickness and root canal area of mandibular molars  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese Este estudo avaliou o aumento da área do canal e a espessura de dentina na parede mesial e distal dos canais mesiais de molares inferiores após o uso de Gates Glidden (GG), La Axxess (LA), Orifice Shaper (OS). Um total de 53 canais mesiais de 27 molares inferiores foram incluídos em resina e dividid [...] os em 3 grupos. As raízes foram seccionados 3 mm abaixo da junção cemento-esmalte e as imagens foram capturadas antes e depois da instrumentação. O aumento da área do canal em percentagem e a espessura da dentina remanescente nas paredes mesial e furca foram calculados utilizando o software Image Tools. Os dados foram analisados utilizando o Kruskal-Wallis e teste de Dunn. O Nível de significância foi de 5%. Todos os instrumentos promoveram o aumento da área cervical, com diferentes quantidades de remoção da dentina nas paredes mesial e distal do canal radicular. Diferença estatística (p0,05) entre as paredes mesial e distal de todos os instrumentos analisados. O LA 35.06 e GG 3 mostraram a menor espessura da parede e sua utilização em canais mesiais de molares inferiores deve ser feito com cuidado. Abstract in english This study evaluated the increase of the instrumented area and dentin thickness in the mesial and distal aspects of mesial canals of mandibular molars after the use of Gates Glidden (GG), LA Axxess (LA) and Orifice Shaper (OS) instruments. A total of 53 canals from 27 mandibular molars were embedded [...] in resin and divided into 3 groups. The roots were sectioned 3 mm below the cementoenamel junction and the images were captured before and after instrumentation. The increase of the instrumented area in terms of percentages and the remaining dentin thickness, in mm, at the mesial and furcal aspects were calculated using the Image tools software. Data were analyzed using the Kruskal-Wallis and Dunn's test. The significance level was set at 5%. All instruments promoted cervical flaring with different amounts of dentin removal at the mesial and distal aspects of the root canals. Statistically significant difference (p0.05) was found between the mesial and distal walls in all groups. It may be concluded that LA 35.06 and GG 3 burs produced the thinnest dentin walls, and thus their use in mesial canals of mandibular molars should be done with caution.

Marco Antonio Hungaro, Duarte; Ricardo Affonso, Bernardes; Ronald, Ordinola-Zapata; Bruno Carvalho de, Vasconcelos; Clovis Monteiro, Bramante; Ivaldo Gomes de, Moraes.

195

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.)

196

The intercollicular area of the inferior colliculus.  

Science.gov (United States)

To study the somatosensory input to the inferior colliculus, lesions were made in the dorsal column nuclei of the hedgehog, tree shrew, slow loris, marmoset and African green monkey, and spinal cord of the hedgehog, tree shrew and slow loris. The degenerating fibers stained with silver impregnation methods. The dorsal column system projects primarily to an area lateral to the central nucleus of the inferior colliculus, whereas the spinotectal projection is primarily to the medial region in the hedgehog and medial and dorsal regions in the tree shrew and slow loris. Both fiber systems are quantitatively quite constant in the various species. It is apparent from published data on a variety of mammals that the central nucleus is primarily part of the auditory system in which the intercollicular area is involved only indirectly via projections from the central nucleus and auditory cortex. In nonmammalian vertebrates, the data available suggest that there is a comparable area in the mesencephalon that is involved with somatosensory as well as auditory sensation. Since low frequency stimulation, generally characterized as vibration, stimulates both modalities, the intercollicular area may be the input side of a mechanism for alterting the animal to vibratory stimuli. PMID:825188

Schroeder, D M; Jane, J A

1976-01-01

197

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

198

Pattern of third molar impaction in a Saudi population  

Directory of Open Access Journals (Sweden)

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

199

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

Scientific Electronic Library Online (English)

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

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

200

An evaluation of volumes and concentrations of lidocaine in human inferior alveolar nerve block.  

Science.gov (United States)

The purpose of this study was to evaluate, with the electric pulp tester, the anesthetic efficacy of 1.8 ml of 2% lidocaine with 1:100,000 epinephrine, 3.6 ml of 2% lidocaine with 1:200,000 epinephrine, and 1.8 ml of 4% lidocaine with 1:100,000 epinephrine in human inferior alveolar nerve block. Thirty subjects randomly received each of the solutions at three successive appointments. The first molar, canine, lateral incisor, and contralateral canine were tested with the pulp tester at various time intervals up to 55 min. Complete anesthesia was defined as an 80/80 reading with the pulp tester. No significant differences in anesthetic success or failure were found among the three solutions. Potential anesthetic problems (failure, noncontinuous anesthesia, slow onset, and short duration) occurred in 43 to 57% of the molars, in 43 to 60% of the canines, and in 57 to 80% of the lateral incisors. Complete anesthesia in the mandible is a meaningful clinical problem. PMID:2607268

Vreeland, D L; Reader, A; Beck, M; Meyers, W; Weaver, J

1989-01-01

 
 
 
 
201

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

202

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.

203

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

International Nuclear Information System (INIS)

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

204

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

205

Regulatory Scientific Advice on Non-Inferiority Drug Trials  

Science.gov (United States)

The active-controlled trial with a non-inferiority design has gained popularity in recent years. However, non-inferiority trials present some methodological challenges, especially in determining the non-inferiority margin. Regulatory guidelines provide some general statements on how a non-inferiority trial should be conducted. Moreover, in a scientific advice procedure, regulators give companies the opportunity to discuss critical trial issues prior to the start of the trial. The aim of this study was to identify potential issues that may benefit from more explicit guidance by regulators. To achieve this, we collected and analyzed questions about non-inferiority trials posed by applicants for scientific advice in Europe in 2008 and 2009, as well as the responses given by the European Medicines Agency (EMA). In our analysis we included 156 final letters of advice from 2008 and 2009, addressed to 94 different applicants (manufacturers). Our analysis yielded two major findings: (1) applicants frequently asked questions ‘whether’ and ‘how’ to conduct a non-inferiority trial, 26% and 74%, respectively, and (2) the EMA regulators seem mainly concerned about the choice of the non-inferiority margin in non-inferiority trials (36% of total regulatory answers). In 40% of the answers, the EMA recommended using a stricter margin, and in 10% of the answers regarding non-inferiority margins, the EMA questioned the justification of the proposed non-inferiority margin. We conclude that there are still difficulties in selecting the appropriate methodology for non-inferiority trials. Straightforward and harmonized guidance regarding non-inferiority trials is required, for example on whether it is necessary to conduct such a trial and how the non-inferiority margin is determined. It is unlikely that regulatory guidelines can cover all therapeutic areas; therefore, in some cases regulatory scientific advice may be used as an opportunity for tailored advice. PMID:24040346

Knol, Mirjam J.; Klungel, Olaf H.; Gispen-De Wied, Christine C.; de Boer, Antonius; Hoes, Arno W.; Leufkens, Hubert G.; Mantel-Teeuwisse, Aukje K.

2013-01-01

206

Stress to the Bone around Orthodontic Implants in the Mandibular Molar Region: A Finite Element Evaluation  

Directory of Open Access Journals (Sweden)

Full Text Available Mini-screw implants have been commonly used for orthodontic anchorage. However, the behavior of implants may vary according to their location, inclination, loading position and loading direction. The objective of this study was to apply fi nite element to analyze stress distribution around mini-implants inserted into the buccal cortical bone, in the inferior molar region, when a force of 3 N was applied, varying implant inclination and loading direction, also simulating immediate loading and osseointegration conditions. We carried out a threedimensional analysis of a human cadaveric mandible and of a 9 mm length, 1.5 mm diameter titanium implant. The implant model was introduced into the buccal cortical bone, between the fi rst and second mandibular molars. Finite-element analysis of the implant-bone structure was carried out applying a constant force of 3 N at varying angles (15, 30, 45, 60, 75, and 90 degrees, and in fi ve different positions along the bone surface axis (perpendicularly, vertically at ± 10 degrees, and horizontally at ± 20 degrees. Out of all combinations tested, stress affected only the cortical bone, not being intense enough to cause cortical bone resorption. Stress distribution varied slightly (8.55 to 38.74 Mpa due to implant inclination and loading direction. Immediate loading generated greater tensions (12.70 to 38.74 Mpa when compared to osseointegration (8.55 to 21.44 Mpa. A force of 3 N did not result in a tension that could cause cortical bone resorption. Immediate loading resulted in greater tensions to the bone, regardless of implant inclination and loading direction.

Rog\\u00E9rio Coelho de Aguiar

2012-01-01

207

Uterine rupture following incomplete molar pregnancy: a case report  

Directory of Open Access Journals (Sweden)

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

Pourali L

2013-03-01

208

Occlusal morphology of mandibular second molars in Iranian adolescents  

Directory of Open Access Journals (Sweden)

Full Text Available Context: During human evolution, the morphology of mandibular molar occlusal surface has changed from pattern "y" to pattern "+". Six types of occlusal patterns were classified as: +4, 4-y,+5, 5-y,+6 and 6-y. Aims: To determine the prevalence of these six types of mandibular second molars in Iranian adolescents. Settings and Design: This descriptive investigation was undertaken in the high schools of Isfahan city, Iran. The students were selected by cluster sampling method, and then they were screened and only those with erupted mandibular second molars bilaterally were selected. Materials and Methods: A total of 794 cases were randomly selected and the number of cusps and groove pattern of mandibular second molar were examined intra-orally and by studying dental casts. Statistical Analysis Used: Descriptive statistics and chi-square test were used for data analysis. Results: The most frequent occlusal configuration was the "+4" form (76.9%. A total of 683 cases (86% were found to have four-cusp form, 104 cases (13.1% were five-cusp form and 7 cases (0.9% were six-cusp form. Conclusion: The most frequent occlusal configuration was the "+4" form; thus, there is a high evolutionary trend in Iranian mandibular second molars.

Mosharraf Ramin

2010-01-01

209

Histopathologic Evaluation of Follicular Tissues Associated with Impacted Third Molars  

Directory of Open Access Journals (Sweden)

Full Text Available Objective: The aim of the present study was to histopathologically evaluate follicular tissues of third molars with pericoronal radiolucenciesof less than 2 millimeters.Materials and Methods: In this descriptive analytic study, 100 impacted third molars with normal follicular spaces were removed and their pericoronaltissues submitted for histopathologic examination. Different characteristicsof the epithelium and connective tissue were evaluated in all cases. Statisti-cal analysis was performed using chi square and Mann-Whitney tests.Results: In our study sample, 74% of the patients were female and 26% were male, ranging in age from 13 to 54 years (mean, 25.3 years. Lining epithelium was observed in 69% of the specimens of which 31%, 23% and 14% was cuboidal, squamous and columnar, respectively. A significant re-lationship was found between the presence of squamous epithelium and pa-tient age (P<0.05. Nonspecific chronic inflammation was the only patho-logic finding observed in 44% of the specimens. Inflammation was signifi-cantly associated with age and squamous metaplasia (P<0.05.Conclusion: Considering that pathologic lesions were not observed in anyof the studied cases, unerupted third molars should not be removed unless there is a clinical indication to do so, or in case the impacted molar shows evidence of pathological changes. Follow-up is suggested for asympto-matic impacted third molars.

M. Khorasani

2008-06-01

210

Congenital anomalies of the inferior vena cava  

Energy Technology Data Exchange (ETDEWEB)

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

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

2012-02-15

211

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.

212

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

213

Anxiety and extraction of third molars in Turkish patients.  

Science.gov (United States)

Preoperative anxiety is widespread and adversely affects a patient's physical and psychological outcome. Extraction of third molars is common, and many patients complain of anxiety and emotional disturbance. We assessed the anxiety of patients in Turkey before extraction of third molars. A total of 120 patients were admitted for removal of one or more third molars under local anaesthesia. The Amsterdam Preoperative Anxiety and Information Scale (APAIS) and Spielberger's State Trait Anxiety Inventory (STAI) were used to evaluate anxiety. The results showed that women were significantly more anxious than men; women who had not had a previous operation were more anxious than other women; there was no difference in the anxiety scores of patients who had previously had a local anaesthetic and those who had not; there were no differences in anxiety as measured by trait scores; patients who wanted a lot of information were more anxious. PMID:15544887

Garip, Hasan; Abali, Osman; Göker, Kamil; Göktürk, Ulkü; Garip, Yildiz

2004-12-01

214

- and Low-Molar Liquid Crystal Mixtures for Photorefractive Applications  

Science.gov (United States)

We describe a highly efficient photorefractive material possessing high-molar-mass liquid crystal (H-LC), low-molar-mass liquid crystal (L-LC), and photoconductive agent. These photorefractive high- and low-molar-mass liquid crystal mixtures (HL-LCMs) show high-performance in a thick grating regime (Bragg regime) under low dc electric fields (< 1 V/?m). The photorefractive properties are strongly dependent on the concentration of the H-LC. The fastest response time of 70 ms is achieved with a gain coefficient of 213 cm-1 in the case of 10 wt% of the H-LC with 0.18 V/?m. The largest gain coefficient of over 600 cm-1 is achieved with the response time of 2.6 s in the case of 40 wt% of the H-LC with 0.7 V/?m. In addition, our future directions in this research area are also presented.

Ono, Hiroshi; Kawatsuki, Nobuhiro

215

Treatment of ectopic mandibular second permanent molar with elastic separators.  

Science.gov (United States)

Ectopic eruption is a developmental disturbance in which the tooth fails to follow its normal eruption pathway. Ectopic eruption of the second molar is relatively rare. This paper presents the case of thirteen-year-old male with an ectopic mandibular second permanent molar. The condition was corrected with surgical exposure and placement of elastic separators. This case report lays emphasis on the practice of basic methods to obtain acceptable results rather than extensive surgical or orthodontic corrections. It is advised that ectopic teeth should not be neglected especially when it concerns developing caries and malocclusion. PMID:25050182

Rajesh, R; Naveen, V; Amit, S; Baroudi, Kusai; Sampath Reddy, C; Namineni, Srinivas

2014-01-01

216

Agenesia de vena cava inferior y traumatismo abdominal cerrado / Inferior caval agenesis and renal trauma  

Scientific Electronic Library Online (English)

Full Text Available SciELO Spain | Language: Spanish Abstract in spanish Presentamos el caso de un varón de 16 años, con agenesia de vena cava inferior que sufre una caída, resultando de la misma un severo traumatismo de la unidad renal izquierda. Revisamos las recomendaciones de actuación frente a traumatismos de alto grado y, valoramos, si existen en pacientes con esta [...] anomalía, factores que predispongan a aumentar la severidad de las lesiones frente a traumatismos. Abstract in english We are publishing a case of sixteen years old male, with inferior caval agenesis suffering a fall, and having a serious trauma over the left renal unit. We review the recommendations of intervention in front of high grade renal trauma and we too study the existing knowledge on the literature in orde [...] r to get a posible higher incidence of this kind of trauma in patients with these anomaly.

A., Barbagelata López; E., Fernández Rosado; J.L., Ponce Díaz-Reixa; E., Romero Selas; I., Rodríguez Gómez; M., González Martín.

217

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

Directory of Open Access Journals (Sweden)

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

Elton Correia Alves

2010-12-01

218

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

Scientific Electronic Library Online (English)

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

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

219

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.

220

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

Directory of Open Access Journals (Sweden)

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

Eduardo Piza PELLIZZER

1998-10-01

 
 
 
 
221

Extraction Timing of Heavily Destructed Upper First Permanent Molars  

Directory of Open Access Journals (Sweden)

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

222

A permanent mandibular second molar with seven root canal systems.  

Science.gov (United States)

This case report illustrates the nonsurgical endodontic management of a seven-canaled mandibular second molar. The root canal configuration presented as four mesial and three distal canals. Identification of the canal system was made with the aid of magnification, ultrasonics, and multiple angulated radiographs. Postoperative examination at 18 months showed a clinically asymptomatic tooth with resolution of the periapical pathology. PMID:24634902

Kottoor, Jojo; Paul, Kuriachan Kottanathu; Mathew, Joy; George, Saira; Mathew, Jain; Roy, Arun

2014-05-01

223

Inflammatory root resorption in primary molars: prevalence and associated factors  

Directory of Open Access Journals (Sweden)

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

Raquel Gonçalves Vieira-Andrade

2012-08-01

224

Miniscrew-supported coil spring for molar uprighting: description  

Scientific Electronic Library Online (English)

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

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

225

Miniscrew-supported coil spring for molar uprighting: description  

Scientific Electronic Library Online (English)

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

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

2013-02-01

226

Anquilose em molares decíduos - relato de caso clínico  

Directory of Open Access Journals (Sweden)

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

227

Miniscrew-supported coil spring for molar uprighting: description  

Directory of Open Access Journals (Sweden)

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

Antônio Carlos de Oliveira Ruellas

2013-02-01

228

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

Science.gov (United States)

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

229

Adaptive global synchrony of inferior olive neurons  

International Nuclear Information System (INIS)

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.

230

Leiomyosarcoma of the inferior vena cava.  

Science.gov (United States)

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

231

Evaluation in vitro of pulpal chamber temperature of deciduous teeth during Er:YAG laser application; Avaliacao in vitro da temperatura na camara pulpar de dentes deciduos durante aplicacao do laser de Er:YAG  

Energy Technology Data Exchange (ETDEWEB)

The Er:YAG laser technology has been thoroughly studied, since its invention, and has been increasingly recommended in Dentistry. However, its use in deciduous teeth has not been deserving the equivalent attention to its counterpart in permanent teeth, despite of the deciduous teething occur in a phase of life in which it has a far more importance than its substitutes. For that reason, this study aims to identify the suitable parameters to the clinic procedures in deciduous teeth, using the already established protocols in permanent teeth. The study was lead in a way to resemble the most the conditions of the clinical use of the laser. Five groups were analyzed using different energy densities and repetition rates. Each group was composed of 10 first superior right deciduous molars randomly selected. The energy densities and repetition rates used for each group were: 60 mJ 15 Hz, 250 mJ 2 Hz, 250 mJ 15 Hz, 400 mJ 6 Hz and 500 mJ 2 Hz. The results obtained allowed us to conclude that the use of the Er:YAG laser in Odontopediatrics is effective, safe and secure and the main reason for its recommendation is the low transfer of heat to the adjacent tissues of the applied surfaces. (author)

Sznajder, Alexandre Joseph

2001-07-01

232

Distribution and characteristics of molar-incisor hypomineralization  

Directory of Open Access Journals (Sweden)

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

Jankovi? Svjetlana

2014-01-01

233

Inferior oblique inclusion, Incidence Early detection and Prevention  

Directory of Open Access Journals (Sweden)

Full Text Available Purpose: To evaluate the incidence of inferior oblique inclusion during hooking of the lateral rectus muscle and how to detect and prevent. Methods : 50 patients (80 eyes operated upon lateral rectus muscles(recession 55 eyes resection 25 eyes for correction of horizontal deviation (esotropia and exotropia the incidence of inferior oblique inclusion during hooking of the lateral rectus muscle throw fornix conjunctival incision was evaluated and managed. Results: the incidence of inferior oblique inclusion was found in 17 eyes 21.25%(12 eyes 15% Partial inclusion and 5 eyes 6.25% total inclusion the inclusion was detected and managed early. Post operatively no element of vertical deviation due to inferior oblique inclusion. Conclusion: inferior oblique inclusion is a preventable complication if taken in consideration during hooking of the lateral rectus muscle.

Mahmoud M Saleh

2010-06-01

234

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese OBJETIVO: determinar se a apresentação clínica da mola hidatiforme tem mudado nos últimos anos (1992-1998) quando comparada a registros históricos de controle (1960-1981). MÉTODOS: foram revisadas 80 fichas de pacientes com mola hidatiforme acompanhadas entre 1960-1981 no Centro de Neoplasia Trofobl [...] ástica Gestacional da Santa Casa da Misericórdia (Rio de Janeiro Brasil) e as de 801 pacientes atendidas entre 1992-1998 no mesmo centro. Foram analisados os seguintes parâmetros: idade, número de gestações, sangramento vaginal, hiperêmese, edema dos membros inferiores, hipertensão arterial, útero grande para a idade gestacional e cistos teca-luteínicos dos ovários. Para análise estatística foram utilizados os testes do qui-quadrado e o cálculo do odds ratio (OR) com intervalo de confiança (IC) de 95%. RESULTADOS: com relação à idade, a ocorrência de mola em pacientes com menos de 15 anos ou mais de 40 foi significativamente mais freqüente no grupo II do que no grupo I; quanto ao número de gestações, a diferença entre os dois grupos só não foi significativa entre aquelas pacientes que gestavam pela terceira e quarta vez. A hipertensão arterial, foi detectada em porcentagem semelhante nos dois grupos e útero grande para a idade gestacional foi mais freqüente no grupo II (41,4 vs 31,2% - p Abstract in english OBJECTIVE: to determine whether the clinical presentation of hydatidiform mole has changed in the recent years (1992-1998) when compared with historic controls (1960-1981). METHODS: medical records of 80 patients with hydatidiform mole attended in the 1960-1981 period (Group I) were reviewed and com [...] pared to data from 801 patients followed in the 1992-1998 period (Group II). The clinical signals and symptoms analyzed were: age distribution, number of pregnancies, vaginal bleeding, hyperemesis, edema, hypertension, large uterus for gestation date and theca lutein cysts of the ovaries. Statistical analyses employed chi-square tests and odds ratio (OR) estimate with the confidence interval (CI) of 95%. RESULTS: concerning age, the disease occurred more frequently in group II than in group I, in patients under 15 and over 40 years old. As to the number of pregnancies, there was no statistical difference only in those patients who were in their third or fourth pregnancies. Arterial hypertension was the only symptom that occurred with similar frequency in both groups. Enlarged uterus was more frequent in group II (41.4 X 31.2% - p

Paulo, Belfort; Antônio, Braga.

2004-07-01

235

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese OBJETIVO: determinar se a apresentação clínica da mola hidatiforme tem mudado nos últimos anos (1992-1998) quando comparada a registros históricos de controle (1960-1981). MÉTODOS: foram revisadas 80 fichas de pacientes com mola hidatiforme acompanhadas entre 1960-1981 no Centro de Neoplasia Trofobl [...] ástica Gestacional da Santa Casa da Misericórdia (Rio de Janeiro Brasil) e as de 801 pacientes atendidas entre 1992-1998 no mesmo centro. Foram analisados os seguintes parâmetros: idade, número de gestações, sangramento vaginal, hiperêmese, edema dos membros inferiores, hipertensão arterial, útero grande para a idade gestacional e cistos teca-luteínicos dos ovários. Para análise estatística foram utilizados os testes do qui-quadrado e o cálculo do odds ratio (OR) com intervalo de confiança (IC) de 95%. RESULTADOS: com relação à idade, a ocorrência de mola em pacientes com menos de 15 anos ou mais de 40 foi significativamente mais freqüente no grupo II do que no grupo I; quanto ao número de gestações, a diferença entre os dois grupos só não foi significativa entre aquelas pacientes que gestavam pela terceira e quarta vez. A hipertensão arterial, foi detectada em porcentagem semelhante nos dois grupos e útero grande para a idade gestacional foi mais freqüente no grupo II (41,4 vs 31,2% - p Abstract in english OBJECTIVE: to determine whether the clinical presentation of hydatidiform mole has changed in the recent years (1992-1998) when compared with historic controls (1960-1981). METHODS: medical records of 80 patients with hydatidiform mole attended in the 1960-1981 period (Group I) were reviewed and com [...] pared to data from 801 patients followed in the 1992-1998 period (Group II). The clinical signals and symptoms analyzed were: age distribution, number of pregnancies, vaginal bleeding, hyperemesis, edema, hypertension, large uterus for gestation date and theca lutein cysts of the ovaries. Statistical analyses employed chi-square tests and odds ratio (OR) estimate with the confidence interval (CI) of 95%. RESULTS: concerning age, the disease occurred more frequently in group II than in group I, in patients under 15 and over 40 years old. As to the number of pregnancies, there was no statistical difference only in those patients who were in their third or fourth pregnancies. Arterial hypertension was the only symptom that occurred with similar frequency in both groups. Enlarged uterus was more frequent in group II (41.4 X 31.2% - p

Paulo, Belfort; Antônio, Braga.

236

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)

237

Relationship between bulk and local chemistries (hideout return) in molar ratio control and non molar ratio control  

International Nuclear Information System (INIS)

Analysis of PWR steam generator hideout return data employing EPRI's MLTLTEQ codes yielded wide variations in predicted crevice solution pH. Reliable correlations of pH and hideout return and operating molar ratios of sodium to chloride and sodium to chloride plus sulfate were not present. Crevices were predicted to contain concentrated solutions of sodium chloride and potassium chloride during operation

238

Estudio de mezclas de disolventes orgánicos y triglicéridos de aceite de linaza o los ácidos grasos libres. I.- Volumen molar, refracción molar y viscosidad dinámica  

Directory of Open Access Journals (Sweden)

Full Text Available Measurements of molar volume, refraction index and dynamic viscosity in mixtures of fatty acids or triglycerides and trichloroethylene, tetrachloroethylene and hexane were realized. Temperature range studied was 278-313 K each 5 K. The relationship between molar volume and molar fraction show high correlation coefficient In fatty acids with trichloroethylene and tetrachloroethylene mixtures. On the other hand, hexane mixtures show little contractions of molar volume at low molar fractions. Triglyceride mixtures present important deviations with regard to the ideality of the molar volume. The adjusts obtained for the molar volume values versus temperature are acceptable, calculating the coefficients of thermal expansion of the studied mixtures. Equally, the adjust of the experimental results of viscosity for two prediction equations are studied: one of additive type and the other of parabolic type.

Se han realizado medidas del volumen molar, índice de refracción y viscosidad dinámica en el intervalo de temperatura de 278 K a 313 K cada 5 K, a mezclas de ácidos grasos o triglicéridos con tricloroetileno, tetracloroetileno y hexano. Las mezclas de ácidos grasos con tricloroetileno y tetracloroetileno, presentan unos altos coeficientes de correlación para los valores del volumen molar frente a la fracción molar, mientras que las mezclas con hexano, a fracciones molares bajas, manifiestan una pequeña contracción del volumen molar. Las mezclas de triglicéridos presentan importantes desviaciones con respecto a la Idealidad del volumen molar. Los ajustes obtenidos para los valores del volumen molar frente a la temperatura son aceptables, determinándose los valores del coeficiente de dilatación volumétrica a presión constante de las mezclas estudiadas. Igualmente se ha estudiado el ajuste de los resultados experimentales de viscosidad a dos ecuaciones de predicción: una del tipo aditiva y otra del tipo parabólico.

Mantell Serrano, C.

1995-06-01

239

Retenção prolongada de molares decíduos: diagnóstico, etiologia e tratamento / Prolonged retention of deciduous molars: diagnosis, aetiology and treatment  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese Este estudo apresenta uma revisão de literatura e um relato de dois casos clínicos sobre retenção prolongada de molares decíduos, com o objetivo de descrever os meios de diagnóstico, a etiologia, as implicações clínicas e o tratamento desta condição. Fatores etiológicos locais, ambientais ou genétic [...] os podem levar à retenção de molares decíduos, interferindo na seqüência normal de erupção dos pré-molares. Nos dois casos clínicos apresentados, os pacientes apresentaram um quadro de erupção dentária incompatível com a idade cronológica. A conduta terapêutica baseou-se na realização de exodontias dos elementos retidos, seguida da manutenção de espaço e controle clínico e radiográfico até a erupção dos sucessores. O diagnóstico e a intervenção precoces são de fundamental importância para evitar danos à oclusão. Abstract in english This paper consist of a literature review about the prolonged retention of the primary molars and two clinical case reports with the purpose of describing the the diagnosis, etiology, the clinical implication and the recommend treatment for this condition. Local, environmental or genetic etiological [...] factors may lead to over-retention of primary molars, interfering in the normal sequence of the eruption of the premolars. In the two case reports presented the patients'dental eruption showed not to be compatible to their chronological age. The recommended treatment was based on the extraction of the retained elements followed by the space maintenance and by clinical and radiographic control until the eruption of the succedaneous teeth.The early diagnosis and intervention are very important to prevent damages to the occlusion.

Flávia Santos, Teixeira; Vera, Campos; Constance, Mitchell; Laura Maria Barbosa de, Carvalho.

240

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

 
 
 
 
241

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

242

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

Scientific Electronic Library Online (English)

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

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

2008-06-01

243

Molar luxations caused by holding water taps. Report of five cases.  

Science.gov (United States)

Luxation of a primary molar occurs rarely. Here, we describe five cases of primary molar luxation caused by holding a water tap pipe in the mouth during bathing. The patients were aged 16 to 19 months and the mandibular first primary molar was affected in all five cases. The second primary molar had not erupted. It is assumed that the flange of the pipe got stuck in the interdental space between the mandibular primary canine and first primary molar and the affected first molar was pushed out by force with the flange acting as a lever. PMID:24579277

Horie, Norio; Hino, Shunsuke; Fukai, Shunichi; Kaneko, Takahiro; Shimoyama, Tetsuo

2013-01-01

244

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

Directory of Open Access Journals (Sweden)

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

Paulo Belfort

2004-07-01

245

Roentgenologic appearance of left-sided inferior vena cava  

International Nuclear Information System (INIS)

2 Cases of left-sided inferior vena cava, and 2 cases of left-sided inferior vena cava with azygos and hemiazygos continuation were evaluated with computed tomography and other roentgenologic procedures and discussed thier clinical and radiological significance. Left-sided inferior vena cava with azygos (hemiazygos) continuation is often associated with cyanotic or acyanotic congenital heart disease and abnormalities of cardiovascular position, abdominal situs and polysplenia. But, single left-sided inferior vena cavas have little tendency having associated anomalies. Both venous anomalies also shuld be embryologically differentiated, namely, failure of development of the lower portion of the supracardinal veins results in infrahepatic interruption of inferior vena cava with azygos continuation, persistence of the left cardinal system and atrophy of the right system lead to the left-side inferior vena cava. Knowledge of inferior vena cava anomalies is important to the radiologist in order to differentiate between venous anomalies and an enlarged lymph nodes in a patient with malignant tumor. (author)

246

The role of inferior parietal and inferior frontal cortex in working memory.  

Science.gov (United States)

Verbal working memory involves two major components: a phonological store that holds auditory-verbal information very briefly and an articulatory rehearsal process that allows that information to be refreshed and thus held longer in short-term memory (A. Baddeley, 1996, 2000; A. Baddeley & G. Hitch, 1974). In the current study, the authors tested two groups of patients who were chosen on the basis of their relatively focal lesions in the inferior parietal (IP) cortex or inferior frontal (IF) cortex. Patients were tested on a series of tasks that have been previously shown to tap phonological storage (span, auditory rhyming, and repetition) and articulatory rehearsal (visual rhyming and a 2-back task). As predicted, IP patients were disproportionately impaired on the span, rhyming, and repetition tasks and thus demonstrated a phonological storage deficit. IF patients, however, did not show impairment on these storage tasks but did exhibit impairment on the visual rhyming task, which requires articulatory rehearsal. These findings lend further support to the working memory model and provide evidence of the roles of IP and IF cortex in separable working memory processes. PMID:16938015

Baldo, Juliana V; Dronkers, Nina F

2006-09-01

247

Distalização dos molares superiores com aparelho Pendex: estudo cefalométrico prospectivo  

Directory of Open Access Journals (Sweden)

Full Text Available 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 estimula 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.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 orthodontists 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

2007-01-01

248

Density and molar volume studies of phosphate glasses  

Directory of Open Access Journals (Sweden)

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

Chanshetti U.B.

2011-01-01

249

Inflammatory root resorption in primary molars: prevalence and associated factors  

Scientific Electronic Library Online (English)

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

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

250

Molar volumes of aqueous and ethylene glycol solutions of tetrahydrofuran  

Science.gov (United States)

The densities of ethylene glycol solutions of tetrahydrofuran (THF) with 0-20 mol % THF were measured at 20-60°C and atmospheric pressure to an accuracy of 5 × 10-5 g/cm3. The apparent molar volumes of THF in the solutions were calculated and their concentration and temperature dependences determined. The results were compared with the apparent molar volumes of THF in aqueous systems calculated from the literature data. Minima were found on the concentration dependence of the apparent volume of THF for both aqueous and ethylene glycol solutions and changed differently as the temperature increased. The data obtained were discussed from the standpoint of solvophobic effects in aqueous and ethylene glycol solutions of THF.

Rodnikova, M. N.; Gunina, M. A.; Makarov, D. M.; Egorov, G. I.; Val'Kovskaya, T. M.

2011-09-01

251

Developmental regulations of Perp in mice molar morphogenesis.  

Science.gov (United States)

Teraspanin transmembrane protein, Perp (P53 apoptosis effector related to PMP22), which is found in the plasma membrane as a component of the desmosome, is reported to be involved in the morphogenesis of the epithelium and the enamel formation of the incisor. However, its expression pattern and signaling regulation during molar development have not been elucidated in detail. We have examined the precise expression patterns of Perp in developing lower molars and employed the knock-down of Perp by antisense oligodeoxynucleotide treatment during in vitro organ cultivation at embryonic day 13 to define the precise developmental function of Perp. Perp was expressed mainly in the dental lamina and stellate reticulum regions at the bud and cap stages. After Perp knock-down, the tooth germ showed disruption of the dental lamina and stellate reticulum with altered apoptosis and proliferation. The changed expression levels of related signaling molecules from the enamel knot and desmosome were evaluated by real-time quantitative polymerase chain reaction. A renal capsule transplantation method was employed to examine the effects of Perp knock-down on molar crown development. Ultrastructural observations revealed that enamel was deposited more densely in an irregular pattern in the cusp region, and that dentin was hypo-mineralized after Perp knock-down at the cap stage. Thus, Perp might play important roles in the formation and integration of stellate reticulum, dental lamina structure and enamel formation through signaling interactions with the enamel knot and desmosome-related signaling molecules at the cap stage of lower molar development. PMID:24865245

Neupane, Sanjiv; Sohn, Wern-Joo; Rijal, Girdhari; Lee, Ye-Ji; Lee, Sanggyu; Yamamoto, Hitoshi; An, Chang-Hyeon; Cho, Sung-Won; Lee, Youngkyun; Shin, Hong-In; Kwon, Tae-Yub; Kim, Jae-Young

2014-10-01

252

Mini-implants: mechanical resource for molars uprighting  

Digital Repository Infrastructure Vision for European Research (DRIVER)

INTRODUCTION: The early orthodontic treatment allows correction of skeletal discrepancies by growth control, and the elimination of deleterious habits, which are risk factors for the development of malocclusions, favoring for the correction of tooth positioning later in a second treatment stage. During development of teeth and occlusion, the mandibular second molars commonly erupt in the oral cavity after all other teeth of the anterior region. In their eruptive process there may be a conditi...

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

2013-01-01

253

Moxel: A molar tooth voxel model for dosimetric studies  

Energy Technology Data Exchange (ETDEWEB)

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

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

2010-02-15

254

MDCT of inferior mesenteric vein: normal anatomy and pathology  

International Nuclear Information System (INIS)

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

255

MDCT of inferior mesenteric vein: normal anatomy and pathology  

Energy Technology Data Exchange (ETDEWEB)

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

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

2008-07-15

256

Rescue surgery (surgical repositioning) of impacted lower second molars.  

Science.gov (United States)

The impaction of lower second molars, given that its incidence is 0.03 to 0.21%, is a rare complication in tooth eruption. It has been detected more often in unilateral form than bilateral and is more common in the mandible than in the maxillary. It has a slight predilection for males, and mesial inclination is more usual. A wide variety of therapeutic approaches have been published, basically referring to surgical techniques, independent or complemented by means of orthodontic technical aids, with the aim of placing the tooth in the correct position, and which are encompassed under the concept of surgical rescue. In cases resolved with repositioning of an impacted tooth, prophylactic root extraction has been proposed as obligatory. We present a case of a 12 and a half year old patient referred to the University of Seville due to non-eruption of the left lower second molar. The patient was referred by her orthodontist, who detected the impaction before starting orthodontic treatment. The orthodontist requested that, if it was possible, we did not extract the root of the third molar, because its eruption would be feasible in the future (there would be sufficient space in the arch). The spaces available were measured and we decided to attempt the repositioning of the impacted tooth without extracting the root of the wisdom tooth, which was carried out successfully. PMID:16264380

García-Calderón, Manuel; Torres-Lagares, Daniel; González-Martín, Maribel; Gutiérrez-Pérez, José Luis

2005-01-01

257

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

258

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

Scientific Electronic Library Online (English)

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

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

259

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

260

Excess isobaric molar heat capacities and excess molar volumes for ethanol + n-decane and n-undecane systems  

International Nuclear Information System (INIS)

Densities between (278.15 and 308.15) K and isobaric heat capacities per unit volume from (280.15 to 308.15) K for ethanol + n-decane and n-undecane systems were determined at atmospheric pressure over the whole composition range. From these data, excess molar volumes and excess isobaric molar heat capacities were calculated by means of the Benson and Kiyohara's criterion. Results were analyzed in terms of the well-known microscopic effects that take place in alkanol + n-alkane systems. Their dependence with the size of the linear alkane was studied with the help of literature data of short alkyl chain 1-alkanol + long alkyl chain alkane systems

 
 
 
 
261

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.

262

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

Directory of Open Access Journals (Sweden)

Full Text Available A Veia Cava Inferior (VCI interrompida é uma anomalia rara. As anomalias da VCI são clinicamente importantes para os cardiologistas e radiologistas que pretendem intervir na cavidade cardíaca direita. Descrevemos três casos de interrupção da VCI diagnosticados por meio de estudo imaginológico de ressonância magnética cardíaca.La Vena Cava Inferior (VCI, interrumpida es una anomalía rara. Las anomalías de la VCI son clínicamente importantes para los cardiólogos y radiólogos que pretenden intervenir en la cavidad cardíaca derecha. Aquí describimos tres casos de interrupción de la VCI diagnosticados por medio de un estudio imaginológico de resonancia magnética cardíaca.Interrupted inferior vena cava (IVC is a rare anomaly. Anomalies of IVC are clinically important for cardiologists and radiologists who plan to intervene in the right heart. We describe three cases of IVC interruption diagnosed by cardiac magnetic resonance imaging study.

Andre Mauricio Fernandes

2012-02-01

263

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese A Veia Cava Inferior (VCI) interrompida é uma anomalia rara. As anomalias da VCI são clinicamente importantes para os cardiologistas e radiologistas que pretendem intervir na cavidade cardíaca direita. Descrevemos três casos de interrupção da VCI diagnosticados por meio de estudo imaginológico de re [...] ssonância magnética cardíaca. Abstract in spanish La Vena Cava Inferior (VCI), interrumpida es una anomalía rara. Las anomalías de la VCI son clínicamente importantes para los cardiólogos y radiólogos que pretenden intervenir en la cavidad cardíaca derecha. Aquí describimos tres casos de interrupción de la VCI diagnosticados por medio de un estudio [...] imaginológico de resonancia magnética cardíaca. Abstract in english Interrupted inferior vena cava (IVC) is a rare anomaly. Anomalies of IVC are clinically important for cardiologists and radiologists who plan to intervene in the right heart. We describe three cases of IVC interruption diagnosed by cardiac magnetic resonance imaging study. [...

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

264

Congenital isolated absence of the inferior oblique muscle and compensatory aberrant insertion of the inferior and lateral recti.  

Science.gov (United States)

Absence of various extra-ocular muscles has previously been described. However isolated absence of the inferior oblique has not yet been described. Our patient was found to have a small right esotropia and limitation of right eye abduction with an abnormal head posture. Ocular movements showed a marked adduction overshoot in elevation. Exploration of the musculature revealed an absent inferior oblique with abnormally inserted and tight inferior and lateral rectus muscles. Imaging, forced duction testing and surgical exploration is recomended in cases where the signs do not fit into a clear syndrome. PMID:21469964

Qureshi, Farhan; Watson, Nicholas J

2011-03-01

265

Neoplasms of the inferior vena cava - pictorial essay  

International Nuclear Information System (INIS)

This pictorial essay reviews common and rare neoplasms affecting the inferior vena cava (IVC, Table 1), with a particular emphasis on the clinical implications and the role and efficacy of the various imaging techniques. (author)

266

Inferior alveolar nerve sensitivity changes after mandibular trauma  

Directory of Open Access Journals (Sweden)

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

Simonas Grybauskas

2010-12-01

267

CONTRIBUTIONS TO MOLDOVA RIVER’S INFERIOR BASIN VEGETATION KNOWLEDGE  

Directory of Open Access Journals (Sweden)

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

268

CONTRIBUTIONS TO MOLDOVA RIVER’S INFERIOR BASIN VEGETATION KNOWLEDGE  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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; Chifu, T.

2004-01-01

269

Injuries of the retrohepatic inferior vena cava and the liver  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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

270

40 CFR 1065.642 - SSV, CFV, and PDP molar flow rate calculations.  

Science.gov (United States)

...2010-07-01 false SSV, CFV, and PDP molar flow rate calculations. 1065...Requirements § 1065.642 SSV, CFV, and PDP molar flow rate calculations. This...calculate flow during an emission test. (a) PDP molar flow rate. Based upon the...

2010-07-01

271

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

272

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.

273

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  

Directory of Open Access Journals (Sweden)

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

274

Kissing molars and hyperplastic dental follicles: report of a case and literature review.  

Science.gov (United States)

"Kissing" molars are impacted permanent molars that have occlusal surfaces contacting each other in a single follicular space, with roots pointing in opposite directions. It is deemed to be appropriate to medically investigate mucopolysaccharidosis (MPS) in patients presenting with kissing molars as kissing molars have been linked with MPS. The case of bilateral occurrence of kissing molars in an 18-year-old woman is described. Pathological analysis of the follicular tissue suggested hyperplastic dental follicles. Therefore, this case report analysed the association of impacted permanent teeth with hyperplastic dental follicles, following the review of seven documented reports describing such association. PMID:25028691

Kiran, Heggavadipura Yogendraswamy; Bharani, K S N Shiva; Kamath, Rajay Agnel; Manimangalath, Girisankar; Madhushankar, G S

2014-01-01

275

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

International Nuclear Information System (INIS)

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

276

Surgical extraction of deeply horizontally impacted mandibular second and third molars.  

Science.gov (United States)

The presence of deeply horizontally impacted lower second and third molars is unusual. The arrested eruption of the lower second and third molars can determine disturbances of mastication and aesthetics. Moreover, an increased risk of caries in the distal side of the first lower molar is possible. Different therapeutic approaches could be proposed for second and third molar impaction and malposition. In this article, we report the management and the outcome of the surgical treatment of a patient with impacted mandibular second and third molars. PMID:20186075

Boffano, Paolo; Gallesio, Cesare; Bianchi, Francesca; Roccia, Fabio

2010-03-01

277

Anesthetic management in thyroid crisis triggered by molar pregnancy  

Directory of Open Access Journals (Sweden)

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

Harun Aydo?an

2012-09-01

278

Restoration of Endodontically Treated Molars Using All Ceramic Endocrowns  

Science.gov (United States)

Clinical success of endodontically treated posterior teeth is determined by the postendodontic restoration. Several options have been proposed to restore endodontically treated teeth. Endocrowns represent a conservative and esthetic restorative alternative to full coverage crowns. The preparation consists of a circular equigingival butt-joint margin and central retention cavity into the entire pulp chamber constructing both the crown and the core as a single unit. The case reports discussed here are moderately damaged endodontically treated molars restored using all ceramic endocrowns fabricated using two different systems, namely, CAD/CAM and pressed ceramic. PMID:24455318

Carlos, Roopak Bose; Thomas Nainan, Mohan; Pradhan, Shamina; Roshni Sharma; Benjamin, Shiny; Rose, Rajani

2013-01-01

279

Densities and excess molar volumes of alcohol + cyclohexylamine mixtures  

Directory of Open Access Journals (Sweden)

Full Text Available Densities of binary mixtures of 1-propanol, or 2-butanol, or 1-pentanol + cyclohexylamine were measured at temperatures from 288.15 to 313.15 K and atmospheric pressure, while the densities for the system 2-methyl-2-pro-panol + cyclohexylamine were measured at temperatures from 303.15 to 323.15 K and atmospheric pressure. All measurements were performed using an Anton Paar DMA 5000 digital vibrating-tube densimeter. From the experimental densities, the excess molar volumes, VE, were calculated.

SLOBODAN P. ŠERBANOVI?

2009-11-01

280

Compensation trends of the angulation of first molars: retrospective study of 1?403 malocclusion cases.  

Science.gov (United States)

We investigated the compensatory trends of mesiodistal angulation of first molars in malocclusion cases. We compared differences in the angulation of first molars in different developmental stages, malocclusion classifications and skeletal patterns. The medical records and lateral cephalogrammes of 1?403 malocclusion cases taken before treatment were measured to evaluate compensation of molar angulation in relation to the skeletal jaw. The cases were stratified by age, Angle classification and skeletal patterns. Differences in the mesiodistal angulation of the first molars were compared among the stratifications. We observed three main phenomena. First, angulation of the upper first molar varied significantly with age and tipped most distally in cases aged 16 years. The lower first molar did not show such differences. Second, in Angle Class II or skeletal Class II cases, the upper first molar was the most distally tipped, the lower first molar was the most mesially tipped, and opposite angulation compensation was observed in Class III cases. Third, in high-angle cases, the upper and lower first molars were the most distally tipped, and opposite angulation compensation was observed in low-angle cases. These data suggest that the angulation of the molars compensated for various growth patterns and malocclusion types. Hence, awareness of molar angulation compensation would help to adjust occlusal relationships, control anchorage and increase the chances of long-term stability. PMID:24699185

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

2014-09-01

 
 
 
 
281

Compensation trends of the angulation of first molars: retrospective study of 1 403 malocclusion cases  

Science.gov (United States)

We investigated the compensatory trends of mesiodistal angulation of first molars in malocclusion cases. We compared differences in the angulation of first molars in different developmental stages, malocclusion classifications and skeletal patterns. The medical records and lateral cephalogrammes of 1?403 malocclusion cases taken before treatment were measured to evaluate compensation of molar angulation in relation to the skeletal jaw. The cases were stratified by age, Angle classification and skeletal patterns. Differences in the mesiodistal angulation of the first molars were compared among the stratifications. We observed three main phenomena. First, angulation of the upper first molar varied significantly with age and tipped most distally in cases aged 16 years. The lower first molar did not show such differences. Second, in Angle Class II or skeletal Class II cases, the upper first molar was the most distally tipped, the lower first molar was the most mesially tipped, and opposite angulation compensation was observed in Class III cases. Third, in high-angle cases, the upper and lower first molars were the most distally tipped, and opposite angulation compensation was observed in low-angle cases. These data suggest that the angulation of the molars compensated for various growth patterns and malocclusion types. Hence, awareness of molar angulation compensation would help to adjust occlusal relationships, control anchorage and increase the chances of long-term stability. PMID:24699185

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

2014-01-01

282

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

Energy Technology Data Exchange (ETDEWEB)

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

283

Efeito do bisel e do material restaurador sobre a resistência à fratura coronária em pré-molares inferiores com restaurações cervicais  

Directory of Open Access Journals (Sweden)

Full Text Available The aim of this study was to evaluate the fracture strength of lower premolars with cervical restorations, with and without marginal bevel. It was made 64 extracted teeth, that had received cervical standardized preparing, divided in the following groups: Group 1 - sound teeth; Group 2 - teeth only prepared (no restoration; Group 3 - restored teeth with microfi lled composite resin (A110, 3M Espe; Group 4 - prepared teeth with marginal bevel and restored with microfi lledcomposite resin (A110; Group 5 - restored teeth with microhybrid composite resin (Z250, 3M Espe; Group 6 - prepared teeth with marginal bevel and restored with microhybrid composite resin (Z250; Group 7 -restored teeth with low viscosity composite resin (FLOW, 3M Espe; Group 8 - prepared teeth with marginal bevel and restored with low viscosity composite resin (FLOW. For accomplishment of the resistance test, the specimens had been placed individually in a metallic matrix, where the tooth was in a 45° angle in relation to the ground, being exerted a compressive force on the premolar crown in a 0,5 mm/min cross-speed. Data were statistically analysed by ANOVA test (a=0,05 and TUKEY, which had shown that the groups 3 and 4 (A110 without and with bevel, respectively didn´t show any statistically signifi cant difference in relation to group 1 (sound teeth. Group 2 (prepared teeth statistically showed signifi cant reduction in the fracture strength in relation to group 1 (sound teeth. The other groups 5, 6, 7 and 8 (Z250 and FLOW, without and with bevel, (respectively had statistically presented signifi cant differences in relation to group 1 (sound teeth and had not differed among themselves. Then, it was conclude that the microfi lled composite resin A110 was the only restorative material capable to return the fracture strength lost with the cervical preparation, becoming it similar to sound teeth, and the use of the bevel for cervical restorations did not show benefi ts in relation to the fracture strength.

F\\u00E1bio Herrmann Coelho-de-Souza

2008-01-01

284

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

285

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

Directory of Open Access Journals (Sweden)

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

Myriam Sánchez-Gómez

2006-12-01

286

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

Energy Technology Data Exchange (ETDEWEB)

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 < solute mole fraction, x{sub 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 from simultaneous samples.

Tjahjono, Martin [Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (A-STAR), 1 Pesek Road, Jurong Island, Singapore 627833 (Singapore)], E-mail: martin_tjahjono@ices.a-star.edu.sg; Garland, Marc [Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (A-STAR), 1 Pesek Road, Jurong Island, Singapore 627833 (Singapore)

2008-11-15

287

A extração de segundos molares superiores para o tratamento da Classe II / Extraction of upper second molars for treatment of Angle Class II malocclusion  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese Este trabalho tem por objetivo apresentar uma abordagem alternativa para o tratamento ortodôntico das más oclusões de Classe II. Através de uma revisão da literatura, verificou-se que a extração de segundos molares superiores demonstrou ser uma alternativa viável para o tratamento desse tipo de má o [...] clusão. Essa opção terapêutica possibilita maior rapidez na distalização dos primeiros molares com menor necessidade de cooperação por parte do paciente. Porém, a análise do grau de formação, posição intraóssea e morfologia do terceiro molar deve ser cuidadosamente realizada para proporcionar o correto posicionamento do mesmo no lugar do segundo molar extraído. Dois casos clínicos apresentarão a sequência do diagnóstico e tratamento com essa mecânica, exibindo resultados adequados dos pontos de vista funcional e estético. Abstract in english The purpose of this article is to present an alternative approach to the orthodontic treatment of Angle Class II malocclusion. According to a literature review it was observed that the extraction of upper second molars has proven to be a viable alternative for the treatment of this type of malocclus [...] ion. This therapeutic option enables faster first molar retraction and requires less patient compliance. However, the level of development, intraosseous position and morphology of the third molar should be carefully evaluated to ensure its correct positioning in place of the extracted second molar. Two clinical case reports will demonstrate that the sequence of diagnosis and treatment used with this mechanics yields satisfactory functional and aesthetic results.

Maurício Barbieri, Mezomo; Manon, Pierret; Gabriella, Rosenbach; Carlos Alberto E., Tavares.

288

A extração de segundos molares superiores para o tratamento da Classe II Extraction of upper second molars for treatment of Angle Class II malocclusion  

Directory of Open Access Journals (Sweden)

Full Text Available Este trabalho tem por objetivo apresentar uma abordagem alternativa para o tratamento ortodôntico das más oclusões de Classe II. Através de uma revisão da literatura, verificou-se que a extração de segundos molares superiores demonstrou ser uma alternativa viável para o tratamento desse tipo de má oclusão. Essa opção terapêutica possibilita maior rapidez na distalização dos primeiros molares com menor necessidade de cooperação por parte do paciente. Porém, a análise do grau de formação, posição intraóssea e morfologia do terceiro molar deve ser cuidadosamente realizada para proporcionar o correto posicionamento do mesmo no lugar do segundo molar extraído. Dois casos clínicos apresentarão a sequência do diagnóstico e tratamento com essa mecânica, exibindo resultados adequados dos pontos de vista funcional e estético.The purpose of this article is to present an alternative approach to the orthodontic treatment of Angle Class II malocclusion. According to a literature review it was observed that the extraction of upper second molars has proven to be a viable alternative for the treatment of this type of malocclusion. This therapeutic option enables faster first molar retraction and requires less patient compliance. However, the level of development, intraosseous position and morphology of the third molar should be carefully evaluated to ensure its correct positioning in place of the extracted second molar. Two clinical case reports will demonstrate that the sequence of diagnosis and treatment used with this mechanics yields satisfactory functional and aesthetic results.

Maurício Barbieri Mezomo

2010-06-01

289

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.

290

A geometric morphometric analysis of hominin upper first molar shape.  

Science.gov (United States)

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

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

2007-09-01

291

Nanoparticle counting: towards accurate determination of the molar concentration.  

Science.gov (United States)

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

Shang, Jing; Gao, Xiaohu

2014-11-01

292

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.

293

Reversible melting of high molar mass poly(oxyethylene)  

International Nuclear Information System (INIS)

The heat capacity, C p, of poly(oxyethylene), POE, with a molar mass of 900,000 Da, was analyzed by temperature-modulated differential scanning calorimetry, TMDSC. The high molar mass POE crystals are in a folded-chain macroconformation and show some locally reversible melting, starting already at about 250 K. At 335 K the thermodynamic heat capacity reaches the level of the melt. The end of melting of a high-crystallinity sample was analyzed quasi-isothermally with varying modulation amplitudes from 0.2 to 3.0 K to study the reversible crystallinity. A new internal calibration method was developed which allows to quantitatively assess small fractions of reversibly melting crystals in the presence of the reversible heat capacity and large amounts of irreversible melting. The specific reversibility decreases to small values in the vicinity of the end of melting, but does not seem to go to zero. The reversible melting is close to symmetric with a small fraction crystallizing slower than melting, i.e., under the chosen condition some of the melting and crystallization remains reversing. The collected data behave as one expects for a crystallization governed by molecular nucleation and not as one would expect from the formation of an intermediate mesophase on crystallization. The method developed allows a study of the active surface of melting and crystallization of flexible macromolecules

294

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

295

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

Directory of Open Access Journals (Sweden)

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

Rogério Dutra Bandos

2006-10-01

296

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

Directory of Open Access Journals (Sweden)

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

Renata Cristina Faria Ribeiro de Castro

2007-06-01

297

An in vitro morphological investigation of the endodontic spaces of third molars.  

Science.gov (United States)

Aim of this paper was to investigate the particular anatomic features of the endodontic space of third molars in the general population of Croatia. A total of 106 fully developed third molars (56 maxillar and 50 mandibular) has been analyzed. The respective number of roots and of root canals, the structure of the roots, and the curvature and absolute length of the root-canals were analyzed. In most cases, upper third molars had three roots (83.9%), while most of the lower molars were single rooted (56.0%). Upper third molars had mostly three root canals (75.1%), lower third molars two (90.0%). In both jaws, most third molars had curved canals (60.7% in the upper and 84.0% in the lower jaw). 12.5% of upper third molars had lateral and accessory canals, whereas only 4.0% of the lower third molars were found to have them. The Student t-test showed statistically significant differences (p < 0.05) in the length of the root-canals, mesiobuccal and distobuccal canals being significantly shorter than palatinal canals. The same test showed that in the lower third molars the mesial root canals were significantly longer that the distal ones, although slightly. The results obtained are in compliance with similar results by other authors; however, they tend to show some specific population-related features. PMID:23940986

Cosi?, Jozo; Gali?, Nada; Vodanovi?, Marin; Njemirovskij, Vera; Segovi?, Sanja; Paveli?, Bozidar; Ani?, Ivica

2013-06-01

298

Pediatric child abuse victim with posttraumatic inferior vena cava thrombosis.  

Science.gov (United States)

Posttraumatic inferior vena cava thrombosis (IVCT) is very rare, with only a few cases reported in the literature. While thromboembolism as a result of trauma is common in adult patients, it is very rare in young children and seldom involves the inferior vena cava. We report the youngest patient to date with IVCT and the only child reported whose findings are the result of child physical abuse. The diagnosis can be challenging both clinically and radiographically. Additionally, the risks of morbidity and even mortality associated with an IVCT if untreated are significant. PMID:24578163

Goodpasture, Meggan L; Zeller, Kristen A; Petty, John K

2014-05-01

299

Pseudo-dissection of ascending aorta in inferior myocardial infarction.  

Directory of Open Access Journals (Sweden)

Full Text Available Acute aortic dissection is a cardiac emergency which can present as inferior myocardial infarction. It has high morbidity and mortality requiring prompt diagnosis and treatment. Rapid advances in noninvasive imaging modalities have facilitated the early diagnosis of this condition and in ruling out this potentially catastrophic illness. We report an interesting case of a 57 year- old -man who presented with inferior myocardial infarction requiring thrombolysis and temporary pacing wire for complete heart block. An echocardiogram was highly suspicious of aortic dissection. CT scan confirmed that the malposition of the temporary pacing wire through the aorta mimicked aortic dissection.

Grahame K. Goode

2011-06-01

300

Stability of molar relationship after non-extraction Class II malocclusion treatment  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese OBJETIVO: esse estudo objetivou avaliar a estabilidade da relação molar na má oclusão de Classe II tratada ortodonticamente sem extrações, visando quantificar a recidiva e correlacioná-la a alguns fatores. MÉTODOS: a amostra constituiu-se de 39 indivíduos (16 mulheres e 23 homens) com má oclusão de [...] Classe II tratada sem extrações, com aparelhos fixos. A idade inicial média foi de 12,94 anos; na fase final, foi de 15,14 anos; na pós-contenção, 21,18 anos. A média do tempo de tratamento foi de 2,19 anos e do tempo de avaliação pós-tratamento, de 6,12 anos. Para verificar a influência da severidade da relação molar de Classe II inicial na estabilidade da relação molar, a amostra foi dividida em dois grupos, um apresentando relação molar de ½ Classe II ou ¾ de Classe II, e outro apresentando relação molar de Classe II completa. Nos modelos de estudo das três fases estudadas, foram medidas a relação molar, as relações de primeiros e segundos pré-molares e de caninos. Os dados foram analisados pelos testes ANOVA dependente, de Tukey, correlação de Pearson e teste t independente entre dois grupos, divididos pela severidade da relação molar inicial. RESULTADOS: houve recidiva não significativa de 0,12mm na relação molar. A severidade inicial da relação molar de Classe II não se correlacionou com a recidiva no período pós-contenção. Quando a amostra dividiu-se em dois grupos, nenhuma diferença foi encontrada na recidiva da relação molar. CONCLUSÃO: a correção da relação molar de Classe II é estável e a severidade inicial não exerce influência sobre a recidiva da relação molar. Abstract in english OBJECTIVE: This study aimed to evaluate the stability of molar relationship after non-extraction treatment of Class II malocclusion. METHODS: The sample comprised 39 subjects (16 females, 23 males) with initial Class II malocclusion treated with no extractions, using fixed appliances. Mean age at th [...] e beginning of treatment was 12.94 years, at the end of treatment was 15.14 years and at post-retention stage was 21.18 years. Mean treatment time was 2.19 years and mean time of post-treatment evaluation was 6.12 years. To verify the influence of the severity of initial Class II molar relationship in stability of molar relationship, the sample was divided into two groups, one presenting a ½-cusp or ¾-cusp Class II molar relationship, and the other with full-cusp Class II molar relationship. In dental casts from initial, final and postretention stages, molar, first and second premolars and canine relationships were measured. Data obtained were analyzed by dependent ANOVA, Tukey and Pearson's correlation tests, as well as independent t test between the two groups divided by severity of initial molar relationship. RESULTS: There was a non-statistically significant 0.12 mm relapse of molar relationship. The initial severity of Class II molar relationship was not correlated to relapse in the post-retention period. When compared, the two groups showed no difference in relapse of molar relationship. CONCLUSION: It was concluded that correction of Class II molar relationship is stable and initial severity does not influence relapse of molar relationship.

Darwin Vaz de, Lima; Karina Maria Salvatore de, Freitas; Marcos Roberto de, Freitas; Guilherme, Janson; José Fernando Castanha, Henriques; Arnaldo, Pinzan.

2013-04-01

 
 
 
 
301

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.

302

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

Directory of Open Access Journals (Sweden)

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

303

[The pendulis appliance: a palatal miniscrew supported molar distalization device].  

Science.gov (United States)

The maxillary molar distalization is a valuable therapeutic option in some clinical cases. Its biomechanics is challenging and difficult to obtain. Historically, various devices have been described offering successful solutions to this problem such as the Hilgers Pendulum Appliance (1992) and variants linked to mini screws which recently have shown interesting clinical potential. This article presents a new Pendulum variant using a miniscrew, the "pendulis". It follows the original concept (titanium-molybdenum alloy distalization springs and polymethyl-methacrylate pellet) but dental support is replaced by a single palatal miniscrew (median adults, para-median in children) to which the device is fixed by means of a metal welded cap easily positioned and removable by the practitioner. This allows for better control of the oral hygiene and completely controlled extraoral activation. Fabrication steps are described and instruction of use is illustrated with clinical documentation. PMID:25158749

Nappée-Miévilly, Magali; Nappée, François-Joseph; Kerbrat, Jean-Baptiste; Goudot, Patrick

2014-09-01

304

Molar extinction coefficients of some commonly used solvents  

International Nuclear Information System (INIS)

Molar extinction coefficients of some commonly used solvents (ethanol (C2H5OH), methanol (CH3OH), propanol (C3H7OH), butanol (C4H9OH), water (H2O), toluene (C7H8), benzene (C6H6), carbontetrachloride (CCl4), acetonitrile (C4H3N), chlorobenzene (C6H5Cl), diethylether (C4H1O) and dioxane (C4H8O2)) have been determined by a well-collimated narrow beam transmission geometry at 279, 356, 662, 1173, 1252 and 1332 keV ? rays. The total ? ray interaction cross sections of these solvents have also been determined. A good agreement has been obtained between the experimental results with the theoretical values evaluated through XCOM calculations

305

Partial molar quantities of grandite-mixed crystals  

Energy Technology Data Exchange (ETDEWEB)

Properties of partial molar volumes, activities, activity coefficients, mixing free energies, and excess free energies of grossular (Ca/sub 3/Al/sub 2/Si/sub 3/O/sub 12/) in solid solution with andradite (Ca/sub 3/Fe/sub 2//sup +3/Si/sub 3/O/sub 12/) and of grossular in solid solution with uvarovite (Ca/sub 3/Cr/sub 2/Si/sub 3/O/sub 12/) are derived from phase equilibria data. All specific properties show a non-ideal behaviour. Positive deviations from ideality is demonstrated for excess free energy data within the grossular rich portion of the grossular-andradite and grossular-uvarovite solid solution as well. These results are in accordance with experimental results and petrographic observations. (orig.)

Wassermann, A.; Fehr, K.T.; Huckenholz, H.G.

1982-11-01

306

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

307

The MOLAR Project: atmospheric deposition and lake water chemistry  

Directory of Open Access Journals (Sweden)

Full Text Available In the framework of the Mountain Lake Research (MOLAR project, the water chemistry of 23 lakes covering Europe from the Svalbard Islands to the South of Spain were studied. The lakes are located above or beyond the timber line in the most important mountain areas in Europe. Atmospheric deposition was sampled at 11 sites, representative of different lake districts. 24 institutions took part in the activity. The comparability of the analytical results performed in 18 laboratories was assured by strict sampling and analysis protocols and by a detailed programme of Analytical Quality Assessment/Control. The paper summarises the main morphometric and hydrological characteristics of the lakes and their watersheds and discusses the results of the atmospheric deposition and lake water chemistry. An overview on the main processes controlling the composition and ionic ratio of deposition and lake chemistry is given.

The MOLAR Water Chemistry Group

1999-08-01

308

Management of a hopeless mandibular molar: A case report  

Directory of Open Access Journals (Sweden)

Full Text Available Intentional tooth reimplantation can be an alternative treatment option for teeth with poor or hopeless prognosis where coronal and surgical endodontic treatment(s are not possible. This technique may help to restore a natural tooth to function in preference to prosthesis/implant replacements. A 38-years old male was referred to private practice with persistent chronic apical periodontitis of a previously root canal treated mandibular left first molar. A furcal perforation and distolingual cusp fracture was previously repaired and treated with amalgam (~5 years ago. In view of the patient/tooth’s limitations, intentional reimplantation was planned using CEM cement retrograde filling. Clinical and radiographic follow-up during 2 years postoperatively revealed no sign/symptoms of infection or inflammation. Moreover, periradicular healing was evident on radiographs.

saeed asgary

2011-01-01

309

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. Am J Phys Anthropol 155:447-459, 2014. © 2014 Wiley Periodicals, Inc. 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

310

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

311

Manifestaciones en Asturias del Esferoide. Un Util del Paleolítico Inferior  

Directory of Open Access Journals (Sweden)

Full Text Available Hemos agrupado bajo el título de «ESFEROIDES » a todos aquellos útiles tendentes a la esfera, independientemente del sistema de tallado, de su utilización y de su cronología, aunque aquí no-" concretemos a los pertenecientes al Paleolítico Inferior. Los calificativos «astillado», «facetado» y «piaueteado», serán los que definan la técnica de la talla, pero nunca al propio instrumento.

José Adolfo RODRÍGUEZ ASENSIO

2009-10-01

312

Manifestaciones en Asturias del Esferoide. Un Util del Paleolítico Inferior  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Hemos agrupado bajo el título de «ESFEROIDES » a todos aquellos útiles tendentes a la esfera, independientemente del sistema de tallado, de su utilización y de su cronología, aunque aquí no-" concretemos a los pertenecientes al Paleolítico Inferior. Los calificativos «astillado», «facetado» y «piaueteado», serán los que definan la técnica de la talla, pero nunca al propio instrumento.

Rodri?guez Asensio, Jose? Adolfo

2009-01-01

313

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

Directory of Open Access Journals (Sweden)

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

Nahuel Paesano

2010-12-01

314

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

315

[Resection of leiomyosarcoma of the inferior vena cava].  

Science.gov (United States)

Experience in treatment of leiomyosarcoma of the retrohepatic segment of the inferior vena cava at any separately taken clinic is scarce. Given a rare nature of the pathology involved, whose diagnosis and management require joint participation of various-specialty physicians, we have considered it wise to present our own clinical case report. PMID:23531676

Zotov, S P; Pyshkin, S A; Malyshev, M Iu; Safuanov, A Kh; Borovikov, D A; Siniukov, D M; Tereshin, O S; Panov, I O

2013-01-01

316

Automatic Molar Extraction from Dental Panoramic Radiographs for Forensic Personal Identification  

Science.gov (United States)

Measurement of an individual molar provides rich information for forensic personal identification. We propose a computer-based system for extracting an individual molar from dental panoramic radiographs. A molar is obtained by extracting the region-of-interest, separating the maxilla and mandible, and extracting the boundaries between teeth. The proposed system is almost fully automatic; all that the user has to do is clicking three points on the boundary between the maxilla and the mandible.

Samopa, Febriliyan; Asano, Akira; Taguchi, Akira

317

Injuries of the retrohepatic inferior vena cava and the liver  

Directory of Open Access Journals (Sweden)

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

Koprivica Radenko

2008-01-01

318

Statistical genetics of molar cusp patterning in pedigreed baboons: implications for primate dental development and evolution.  

Science.gov (United States)

Gene expression and knock-out studies provide considerable information about the genetic mechanisms required for tooth organogenesis. Quantitative genetic studies of normal phenotypic variation are complementary to these developmental studies and may help elucidate the genes and mechanisms that contribute to the normal population-level phenotypic variation upon which selection acts. Here we present the first quantitative genetic analysis of molar cusp positioning in mammals. We analyzed quantitative measures of molar cusp position in a captive pedigreed baboon breeding colony housed at the Southwest National Primate Research Center in San Antonio, Texas. Our results reveal complete pleiotropy between antimeric pairs of traits--i.e., they are influenced by the same gene or suite of genes. Mandibular morphological homologues in the molar series also exhibit complete pleiotropy. In contrast, morphological homologues in maxillary molar series appear to be influenced by partial, incomplete pleiotropic effects. Variation in the mandibular mesial and distal molar loph orientation on the same molar crown is estimated to be genetically independent, whereas the maxillary molar mesial and distal loph orientation is estimated to have partially overlapping genetic affects. The differences between the maxillary and mandibular molar patterning, and the degree of genetic independence found between lophs on the same molar crown, may be indicative of previously unrecognized levels of modularity in the primate dentition. PMID:15211686

Hlusko, Leslea J; Maas, Mary-Louise; Mahaney, Michael C

2004-05-15

319

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.

320

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish La región glútea es una importante área anatómica y clínica, la cual contiene músculos y vitales elementos neurovasculares. Estos últimos son importantes por razones clínicas y morfológicas. En este trabajo describimos un raro caso de ausencia de la arteria glútea inferior. Encontramos también que l [...] a arteria glútea superior tenía su origen en la división anterior de la arteria iliaca interna. Las estructuras irrigadas normalmente por la arteria glútea inferior estaban irrigadas por una rama que se originaba de la arteria glútea superior. Son discutidos el desarrollo y el significado clínico de esta variación anatómica Abstract in english The gluteal region is an important anatomical and clinical area which contains muscles and vital neurovascular bundles. They are important for their clinical and morphological reasons. In this manuscript we report a rare case of absence of inferior gluteal artery. In the same specimen the superior g [...] luteal artery was taking origin from the anterior division of internal iliac artery. The structures normally supplied by the inferior gluteal artery were supplied by a branch coming from the superior gluteal artery. The developmental and clinical significance of the anatomical variation is discussed

Sreenivasulu, Reddy; Venkata, Ramana  Vollala; Mohandas, Rao.

 
 
 
 
321

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

Directory of Open Access Journals (Sweden)

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