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Sample records for terceros molares retenidos

  1. Presentación de un estudio en 680 pacientes operados de terceros molares retenidos

    Directory of Open Access Journals (Sweden)

    Felicia Morejón Álvarez

    2000-08-01

    Full Text Available Se realizó un estudio en 680 pacientes operados de terceros molares retenidos que fueron atendidos en el Servicio de Cirugía Maxilofacial del Hospital Docente Clinicoquirúrgico "Abel Santamaría" en el período comprendido entre el 6 de octubre de 1998 y el 6 de octubre de 1999, con el objetivo de determinar las complicaciones posoperatorias más frecuentes encontradas en los pacientes operados. Se plantean y analizan los resultados obtenidos y se establecen comparaciones con estudios anteriores. El procedimiento quirúrgico de los terceros molares retenidos constituye una de las actividades operatorias más frecuentes dentro del marco de la cirugía maxilofacial, y a partir de la cual pueden aparecer complicaciones que exigen su diagnóstico oportuno y tratamiento. Como complicaciones posoperatorias más frecuentes se encontraron la alveolitis en el 29,6 %, la celulitis facial posquirúrgica en el 22,7 %, la hemorragia en el 18,2 % y el trismo mandibular, en el 13,7 % de los casos.680 patients who were operated on of impacted third molars at the Maxillofacial Surgery Service of "Abel Santamaría" Clinical and Surgical Teaching Hospital, between October 6, 1998, and October 6, 1999, were studied aimed at determining the most frequent postoperative complications found in the operated on patients.The results obtained were analyzed and compared with those of previous studies. The surgical procedure of the impacted third molars is one of the commonest surgical activities within the framework of maxillofacial surgery. Complications needing a suitable diagnosis and treatment may appear. The most frequent postoperative complications are alveolitis in 29.6%, postsurgical facial cellulitis in 22.7%, hemorrhage in 18.2% and mandibular trismus in 13.7% of the cases.

  2. Lesiones quísticas asociadas a terceros molares retenidos que requirieron hospitalización

    OpenAIRE

    Manuel Estrada Sarmiento

    1998-01-01

    Se realiza una investigación retrospectiva y descriptiva de 18 pacientes hospitalizados que recibieron tratamiento quirúrgico por presentar lesiones quísticas asociadas a un tercer molar retenido, con el objetivo de evaluar dichas lesiones durante el período 1985-1994. De los 18 pacientes 13 eran masculinos, la edad media fue de 33,7 años, 12 pacientes (66,7 %) fueron diagnosticados por exámenes radiológicos. La longitud media de la lesión fue de 39,8 mm, 3 pacientes presentaron signos clínic...

  3. Estudio del saco pericoronario asintomático y la justificación de extirpación junto con el diente, en los terceros molares inferiores retenidos

    OpenAIRE

    Ardiles, José Ricardo

    2015-01-01

    Introducción. Una gran parte de la población presenta terceros molares retenidos y no se somete al proceso de extracción quirúrgica. Objetivo. Comprobar que cantidad de sacos pericoronarios de terceros molares inferiores retenidos asintomáticos tienen potencialidad patológica Materiales y métodos. Se realizó un estudio prospectivo en 80 pacientes de la Facultad de Odontología de Córdoba-Argentina. Se realizaron cirugías y toma de material que consistió en sacos pericoron...

  4. Influencia de los terceros molares retenidos en pacientes con trastornos de la articulación temporomandibular en el hospital de Madrid

    National Research Council Canada - National Science Library

    Barona Dorado, C; Fernández Cáliz, F; Moncada Escorcia, R. A; Merchán Morales, S; Martínez González, J.M

    2009-01-01

    ... clínicas, de pacientes con diagnóstico de trastornos de la articulación temporomandibular atendidos en el Hospital de Madrid divididos en dos grupos con presencia o no de terceros molares incluidos...

  5. Estudio de la efectividad del gel bioadhesivo de clorhexidina en la prevención de la alveolitis y su valor coadyuvante en el postoperatorio tras la extracción de terceros molares inferiores retenidos

    OpenAIRE

    Torres-Lagares, Daniel

    2003-01-01

    La alveolitis es una complicación bastante frecuente tras la extracción, más aún cuando hablamos de la extracción de los terceros molares retenidos. En estos casos la osteítis alveolar es una patología de alto coste social, en forma de días de trabajo perdidos, baja de productividad, consultas de revisión por parte del cirujano y visitas al hospital. El 45% de los pacientes que desarrollan una alveolitis necesitan un mínimo de 4 visitas postoperatorias para diagnosticarla, tratarla y recupera...

  6. Estudio comparativo entre el uso de N – 2 butilcianoacrilato modificado y Vicryl 4 – 0 para el cierre de colgajos en cirugía de terceros molares Inferiores retenidos

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    José Ignacio Serrano

    2014-12-01

    Full Text Available La extracción quirúrgica de los terceros molares supone la síntesis de los tejidos incididos previamente. El método de síntesis más utilizado en la práctica diaria del Cirujano Oral es la sutura con materiales convencionales guiados por una aguja para favorecer la cicatrización por primera intención, sin embargo, en la actualidad se ha puesto en boga la utilización de materiales adhesivos a base de Cianoacrilato para reemplazar las suturas convencionales, con el objetivo de disminuir el dolor postoperatorio, la dehiscencia de las heridas, el riesgo de infecciones, entre otros factores no menos importantes. Objetivo: El objetivo de este estudio predictivo es analizar comparativamente el dolor y la cicatrización de la herida postquirúrgica de terceros molares con la utilización de materiales de sutura adhesiva frente a suturas convencionales de vicryl 4/0 en cirugía de terceros molares retenidos. Materiales y métodos: Para este estudio predictivo se midieron los resultados arrojados de dos técnicas de síntesis en tejidos mucosos a través de la utilización de materiales de sutura convencional (vicryl 4/0 y sutura adhesiva a base de cianoacrilato. Se seleccionaron 30 de un universo de 137 pacientes que acuden al quirófano de la FOUCE y a clínicas particulares del cantón Sangolquí - Pichincha, en los que se realizaron 60 incisiones lineales de 3 cm de longitud, de ambos sexos, de entre 16 y 23 años de edad sin antecedentes patológicos personales. 30 incisiones correspondientes al tercer molar inferior izquierdo fueron sometidas a síntesis con material de sutura convencional y 30 incisiones correspondientes al tercer molar inferior derecho se sellaron con sutura adhesiva a base de cianoacrilato. Para valorar el dolor postquirúrgico se utilizó la técnica de escala visual análoga (EVA y para evaluar la dehiscencia de los tejidos se utilizó el método de inspección y observación. Los dos métodos se utilizaron al segundo

  7. CONVENIENCIA DE LA CIRUGÍA PROFILÁCTICA DEL TERCER MOLAR RETENIDO: UN ANÁLISIS DE DECISIONES Prophylactic removal of the third molars: a clinical making decisions

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    Adriana Ramírez

    2008-06-01

    Full Text Available Antecedentes . La proporción de cirugías de terceros molares que se realizan de manera profiláctica es difícil de estimar de manera precisa y depende en muchos casos de la definición que se dé para éste término. Objetivo . Determinar entre pacientes y cirujanos cuál es la alternativa más útil para plantear la cirugía profiláctica de los terceros molares retenidos asintomáticos. Material y métodos. Un análisis de decisiones clínicas (modelo de árbol de decisiones se utilizó para definir el tratamiento del tercer molar retenido asintomático. Las probabilidades para los desenlaces fueron obtenidos de la literatura. Las utilidades o preferencia fueron asignadas independientemente por pacientes y cirujanos. Resultados. La alternativa más conveniente para los pacientes fue la No extracción , mientras que para los cirujanos, la Si extracción . La decisión de los cirujanos resultó inestable al efectuar el análisis de sensibilidad bivariado al modificarse algunos valores asignados en el modelo, mientras que se mantuvo entre los pacientes. Conclusión. Las diferencias en las utilidades asignadas por pacientes y cirujanos, podrían deberse a la falta de información ofrecida al grupo de pacientes y a la diferencia de intereses entre unos y otros, si esto se corrige, la discrepancia entre los dos grupos logrará cerrarse, y a lo mejor podrían llegar a encontrar que la misma decisión es verdaderamente la más conveniente para ambos.Background. The proportion of third party surgeries molars that are carried out in a prophylactic way is difficult to reckon in a precise way and depends in many cases of the definition that be given for this term. Objective. To determinate between patients and surgeons the best choice for third molar surgery. Materials and methods. In order to define the treatment of third molar retained an analysis of decisions was used The probability for events was obtained from literature. The utility was designed

  8. Criterios de extracción de los terceros molares incluidos

    OpenAIRE

    Virgili Gutiérrez, A. M.; Berini Aytés, Leonardo; Gay Escoda, Cosme

    1996-01-01

    Uno de los procedimientos quirúrgicos más habituales de los cirujanos bucales y maxilofaciales es la extracción de los terceros molares incluidos. Este artículo revisa la literatura referente a las indicaciones, contraindicaciones y riesgos asociados a la cirugía de los cordales. Dentro del apartado de las indicaciones, la que genera mayor controversia es la extracción profiláctica.

  9. Estudio comparativo en la utilización de drenaje postextracción de terceros molares impactados

    National Research Council Canada - National Science Library

    Hernán Pérez; Rodrigo Bravo; Marcelo Mardones; Juan Argandoña

    2016-01-01

    Objetivos: Determinar el efecto de la utilización de tubos de drenaje con relación a la respuesta inflamatoria y dolorosa postoperatoria en las exodoncias de terceros molares inferiores impactados. Material y método...

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

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    C. Recio Lora

    2009-08-01

    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

  11. Agenesia de terceros molares en estudiantes de odontología de la Universidad del Valle entre 16 y 25 años.

    OpenAIRE

    Pedro Sarmiento; Adriana Herrera

    2009-01-01

    Antecedentes: Teniendo en cuenta que los terceros molares son los dientes informados en la literatura con mayor variabilidad dentro de la arcada dental en cuanto a características tanto de número, como de forma y tamaño y como la agenesia de los terceros molares varía considerablemente dependiendo de la población estudiada, este trabajo se realizó para obtener información sobre la agenesia de los terceros molares en estudiantes de los diferentes programas académicos de la Escuela de Odontolog...

  12. Eficacia del uso del plasma rico en factores de crecimiento en defectos periodontales distales de segundos molares inferiores, posterior a la extracción de un tercer molar mandibular

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    Carlos Sánchez-Gutiérrez

    2017-07-01

    Conclusiones: No se encontró diferencia significativa con el uso de PRFC en cuanto a ganancia en el nivel clínico de inserción periodontal en el área distal de segundos molares después de la extracción de terceros molares inferiores retenidos.

  13. Alteraciones nerviosas tras la extracción quirúrgica de terceros molares inferiores. Estudio prospectivo

    OpenAIRE

    Valmaseda Castellón, Eduardo

    1999-01-01

    1)OBJETIVOS:Determinar la incidencia de lesiones del nervio dentario inferior y del nervio lingual tras la extracción quirúrgica de terceros molares inferiores e identificar los factores de riesgo de dichas lesiones. Establecer un modelo de regresión logística para predecir la probabilidad de lesión de los nervios dentario inferior y lingual. Describir la evolución de las alteraciones sensoriales.2) MATERIAL Y MÉTODOS:Se recogieron datos para un estudio prospectivo preliminar sobre 449 extrac...

  14. Actitud terapéutica ante sacos foliculares de terceros molares incluídos Therapeutic approach to impacted third molar follicles

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    R. González García

    2005-04-01

    Full Text Available El quiste dentígero o folicular es un quiste odontogénico del desarrollo. Está revestido por el epitelio del folículo dentario, y suele estar en relación con un diente permanente incluído. Presentamos el caso clínico de un paciente en el que se observa la aparición de un quiste dentígero a partir del saco folicular de un tercer molar incluído no exodonciado, y lo comparamos con la evolución de un cordal incluído y su saco folicular contralaterales en los que se realizó la exodoncia. El tratamiento definitivo del quiste dentígero asociado a un tercer molar incluído es quirúrgico, con la exodoncia de la pieza y enucleación del quiste. Los sacos foliculares mayores de 2 mm asociados a terceros molares incluídos evolucionan en numerosas ocasiones a quistes foliculares. Está indicada la exodoncia de dichos cordales para evitar la evolución a quiste dentígero.The dentigerous cyst or follicular cyst is a developmental odontogenic cyst. It is covered by the epithelium of the dental follicle, and it tends to be related to an impacted permanent tooth. The case report of a patient who was seen to develop a dentigerous cyst arising from the follicle of an impacted non-extracted third molar is presented. This is then compared with the evolution of the contralateral impacted third molar and its follicle that was extracted. The definitive treatment for a dentigerous cyst associated with an impacted third molar is surgical, the extraction of the tooth and enucleation of the cyst. Follicles measuring more+ than 2 mm and that are associated with impacted third molars often develop into follicular cysts. The extraction of these third molars is indicated in order to avoid the development of a dentigerous cyst

  15. Agenesia de terceros molares en pacientes de la Facultad de Odontología de la UNAM Agenesia of the third molars in patients of the Faculty of Odontology of the National Autonomous University of Mexico

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    Raúl Díaz Pérez

    2008-12-01

    Full Text Available ANTECEDENTES: los terceros molares o serotinos son los últimos dientes en erupcionar; su presencia genera diversas patologías como apiñamiento, pericoronitis y dolor, generalmente por falta de espacio en los maxilares. Según la filogenia humana son considerados dientes en vías de extinción. Cada vez más presentan una erupción retrasada e incluso ausencia por falta de formación. OBJETIVO: determinar la frecuencia de agenesia de terceros molares en pacientes de la Facultad de Odontología de la Universidad Nacíonal Autónoma de México. MÉTODOS: se examinaron 915 ortopantomografías de pacientes de 16 a 24 años y se realizó el diagnóstico de presencia de los terceros molares, se recabó información sociodemográfica y se analizó la asociación con el sexo usando X². RESULTADOS: el 20 % de la muestra presentó agenesia de los 4 terceros molares, 56 % tuvo los 4, y 24 % solo de 1 a 3, además se encontró que el sexo no determina la presencia de los terceros molares (X²= 0,503, p= 0,478. CONCLUSIONES: la frecuencia de agenesia de terceros molares fue del 20 % y esta es independiente del sexo.ANTECEDENTS: the third molars are the last teeth to erupt. Their presence generate diverse pathologies as crowding, pericoronitis and pain, generally due to the lack of space in the maxillae. According to human phylogeny, they are considered teeth on the way to extinction. They present an increasingly delayed eruption and even absence due to lack of formation, OBJECTIVE: to determine the frequency of agenesia of the third molars in patients of the Faculty of Odontology of the National Autonomous University of Mexico. METHODS: 915 orthopantomographies of patients aged 16-24 were examined and the diagnosis of presence of the third molars was made. Sociodemographic information was necessary and the association with sex was analyzed by using X2. RESULTS: 20 % of the sample presented agenesia of the 4 third molars, 56 % had the 4, and 24 % only from

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

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    Dennis Flanagan DDS

    2012-03-01

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

  17. Morbilidad de la extracción de los terceros molares en pacientes entre los 12 y 18 años de edad

    OpenAIRE

    Chaparro Avendaño, Angie V.; Pérez-García, Sílvia; Valmaseda Castellón, Eduardo; Berini Aytés, Leonardo; Gay Escoda, Cosme

    2005-01-01

    Objetivo: El propósito de este estudio fue analizar la incidencia de complicaciones después de la extracción quirúrgica de los terceros molares en pacientes de 12 a 18 años de edad. Pacientes y método: Se realizó un estudio retrospectivo de 390 extracciones quirúgicas de terceros molares superiores e inferiores en 173 pacientes en edades comprendidas entre los 12 y 18 años de edad, intervenidos bajo anestesia locorregional en el año 2000 en el Máster de Cirugía Bucal e Implantología Bucofacia...

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

    National Research Council Canada - National Science Library

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

    2009-01-01

    .... 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...

  19. 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

    OpenAIRE

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

    2012-01-01

    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 realiza...

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

    OpenAIRE

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

    2009-01-01

    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 postoperatori...

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

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    José Manuel Díaz Fernández

    1996-08-01

    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.

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

    Directory of Open Access Journals (Sweden)

    G. Laissle Casas del Valle

    2009-06-01

    Full Text Available La cirugía de terceros molares constituye en la práctica de la cirugía oral y maxilofacial, una de las intervenciones más realizadas. Las indicaciones son variadas, desde medidas profilácticas hasta grandes lesiones osteolíticas. Algunas de las consecuencias después de dicha intervención son; edema, trismus y dolor postoperatorio. En la técnica quirúrgica, el colgajo cobra gran importancia a la hora de minimizar estas consecuencias. El objetivo del presente estudio es evaluar el postoperatorio de la cirugía de terceros molares mandibulares incluidos, utilizando un colgajo lineal en un lado y un colgajo triangular en el otro lado del mismo paciente. Se realizó un estudio prospectivo en 15 pacientes de la Facultad de Odontología de la Universidad Mayor. Se tomaron registros fotográficos estandarizados y se midió la apertura bucal máxima pre-quirúrgica de cada paciente. Se registró el edema, la limitación de apertura bucal y el dolor a las 48 horas y a los 7 días, además del tiempo intraoperatorio. Todos los datos fueron analizados estadísticamente. No existen diferencias significativas en el edema, limitación de la apertura ni dolor al utilizar ambos colgajos. Tampoco existe correlación entre el tiempo operatorio y las tres variables estudiadas. El postoperatorio de la cirugía de terceros molares mandibulares incluidos es similar al utilizar un colgajo lineal o un colgajo triangular. El cirujano puede optar por uno o el otro indistintamente, según su preferencia.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 important 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

  3. Ensayo clínico aleatorizado, ciego y placebo controlado sobre el uso de profilaxis antibiótica en la prevención de la infección postoperatoria de terceros molares mandibulares impactados. Un estudio piloto

    OpenAIRE

    Montaner, Nicolás Yanine

    2011-01-01

    Objetivo: Determinar la utilidad de la administración de profilaxis antibiótica (PA) para la prevención de complicaciones infecciosas e inflamatorias en la cirugía de terceros molares mandibulares impactados y mesioangulados (TMMim) y verificar la factibilidad de llevar a cabo un protocolo de investigación bajo condiciones ideales, aportando información para un posterior estudio. Diseño del Estudio: Ensayo clínico aleatorizado piloto, ciego y placebo controlado. Materiales y Métodos: 34 pacie...

  4. 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)

    R Fuentes

    2012-08-01

    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

  5. Gel de Clorhexidina intra-alveolar en la prevención de la alveolitis tras la extracción de terceros molares inferiores: estudio piloto

    National Research Council Canada - National Science Library

    Infante Cossío, Pedro; Gutiérrez Pérez, José Luis; Romero Ruiz, Manuel María; Torres Lagares, Daniel; Serrera Figallo, María Angeles

    2006-01-01

    ...% 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...

  6. Comparación de la inflamación de tejidos blandos pos extracción simultánea de terceros molares inferiores utilizando en forma unilateral plasma rico en factores de crecimiento en el servicio de cirugía oral y maxilofacial, Hospital Enrique Garcés

    Directory of Open Access Journals (Sweden)

    Iván Enrique Llerena Toapata

    2015-12-01

    Full Text Available La utilización de plasma rico en plaquetas posextracción de terceros molares permite al paciente sometido a este tipo de tratamientos reducir los síntomas negativos que aparecen posterior a la extracción quirúrgica. La siguiente investigación se realizó en 32 pacientes, 17 mujeres y 15 hombres, que acudieron al servicio de Cirugía Oral y Maxilofacial del Hospital Enrique Garcés de la ciudad de Quito con la presencia de terceros molares inferiores incluidos con las mismas características radiográficas en las piezas dentales Nº 38 (lado izquierdo y Nº 48 (lado derecho A cada paciente se le extrajo 10 cc de sangre para preparar mediante centrifugación y activación el plasma rico en plaquetas, el cual se colocó únicamente posterior a la extracción quirúrgica de los terceros molares inferiores, en el alveolo correspondiente a la pieza Nº 48, sin aplicar nada en el alveolo correspondiente a la pieza Nº 38 y de esta manera observamos que, mediante escalas de medición del dolor y mediciones faciales a las 24 horas, 72 horas y 8 días posterior a la cirugía, nos dio como resultado la disminución tanto del dolor como la inflamación en el lado derecho en comparación con el lado izquierdo.

  7. Prevalencia de dientes incluidos, retenidos e impactados analizados en radiografias panoramicas de poblacion de Bogota, Colombia

    National Research Council Canada - National Science Library

    Sanchez Pavon, Angel Eduardo; Castro Haiek, Diego; Briceno Avellaneda, Carlos Rafael; Barrientos Sanchez, Silvia; Rodriguez Ciodaro, Adriana; Castaneda Pelaez, Diego Andres

    2015-01-01

    ... la necesidad de analizarlas para entender su comportamiento, Objetivo, Determinar la prevalencia de dientes incluidos, retenidos e impactados mediante el analisis de radiografias panoramicas en pacientes...

  8. Eficacia del uso del plasma rico en factores de crecimiento en defectos periodontales distales de segundos molares inferiores, posterior a la extracción de un tercer molar mandibular

    OpenAIRE

    Sánchez-Gutiérrez, Carlos; Cepeda-Bravo, Juan Antonio; Fierro-Serna, Víctor Mario; García-García, Carlos Eduardo; Martínez-Rider, Ricardo; Noyola-Frías, Miguel Ángel

    2016-01-01

    Objetivo: El propósito de este estudio fue evaluar la eficacia de la aplicación de plasma rico en factores de crecimiento (PRFC), dentro de un defecto periodontal distal, a los segundos molares inferiores después de la extracción de un tercer molar mandibular. Material y métodos: Se realizó un ensayo clínico controlado, doble ciego, aleatorizado en 20 pacientes sanos, con defectos óseos bilaterales posterior a la extracción de un tercer molar retenido. Los pacientes fueron dividos en grupo...

  9. El tercero civilmente responsable en el procedimiento penal colombiano

    Directory of Open Access Journals (Sweden)

    Miguel Córdoba Angulo

    2013-06-01

    Full Text Available Se hace un análisis del sistema de responsabilidad civil extracontractual por el cual pueden ser convocados los llamados terceros civilmente responsables y la manera en la que se encuentra regulada su participación en los procedimientos penales. En concreto, se argüirá que la regulación vigente de la figura en el actual Código de Procedimiento Penal no se compadece con la legislación sustancial ni con las exigencias constitucionales mínimas que deben orientar toda actuación judicial.

  10. El tercero civilmente responsable en el procedimiento penal colombiano

    Directory of Open Access Journals (Sweden)

    Miguel Córdoba Angulo

    2013-07-01

    Full Text Available Se hace un análisis del sistema de responsabilidad civil extracontractual por el cual pueden ser convocados los llamados terceros civilmente responsables y la manera en la que se encuentra regulada su participación en los procedimientos penales. En concreto, se argüirá que la regulación vigente de la figura en el actual Código de Procedimiento Penal no se compadece con la legislación sustancial ni con las exigencias constitucionales mínimas que deben orientar toda actuación judicial.

  11. MOLAR UPRIGHTING

    Directory of Open Access Journals (Sweden)

    Eka Erwansyah

    2006-04-01

    Full Text Available The mesial tipping of molar is frequently found in orthodontic cases. This molar malposition must be corrected since it may cause periodontal disorders, occlusal interferences, and temporomandibular joint dysfunction, and is often needed in planning a fixed bridge. This paper is a literature study to discuss about appliance designs, indication, and contraindications, and complication and treatment protocols of molar uprighting by fixed orthodontic appliances. By knowing the techniques of molar uprighting, the moments mentioned above can be avoided.

  12. VALIDACIÓN DE LA RADIOGRAFÍA PANORÁMICA EN LA DETERMINACIÓN DE LA POSICIÓN DEL TERCER MOLAR INFERIOR RESPECTO AL CONDUCTO DENTARIO INFERIOR EN CRÁNEOS DE ADULTOS. AREQUIPA.2013

    OpenAIRE

    OCOLA TICONA, BERLIE CESAR

    2014-01-01

    RADIOGRAFÍA PANORÁMICA HISTORIA Y EVOLUCIÓN FUNDAMENTOS DE LA RADIOGRAFÍA PANORÁMICA TERCEROS MOLARES CRITERIOS GENERALES CASUÍSTICA ETIOLOGÍA ETIOPATOGENIA CONDICIONES ANATÓMICAS DIAGNOSTICO CLASIFICACIÓN DE LAS IMPACTACIONES DEL TERCER MOLAR RELACIÓN DEL TERCER MOLAR INFERIOR CON EL CONDUCTO DENTARIO INFERIOR FORMAS DE PREVENCIÓN

  13. Molar Pregnancy

    Science.gov (United States)

    ... Vaginal bleeding Molar pregnancy Symptoms & causes Diagnosis & treatment Advertisement Mayo Clinic does not endorse companies or products. ... a Job Site Map About This Site Twitter Facebook Google YouTube Pinterest Mayo Clinic is a not- ...

  14. Liberación de incisivo retenido con tratamiento de ortodoncia : Reseña de caso clínico

    OpenAIRE

    Carril, N.; Hereñuz, J. M.

    2015-01-01

    Introducción: los dientes retenidos son los que una vez llegado el momento de la erupción quedan alojados en los maxilares por diversos factores patológicos o traumáticos. La retención puede causar diversas alteraciones. Caso clínico: paciente de sexo masculino de 10 años de edad que llega a la consulta presentando retención de pieza 21 pasado su periodo normal de erupción. Conclusiones: esta afección de diferentes causas etiológicas es infrecuente y puede evidenciarse en niños y rara vez en...

  15. Cuartos molares supernumerarios: relato de caso clínico

    Directory of Open Access Journals (Sweden)

    Daniela Nascimento Silva

    2006-04-01

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

  16. Deciduous molar hypomineralization and molar incisor hypomineralization

    NARCIS (Netherlands)

    Elfrink, M.E.C.; ten Cate, J.M.; Jaddoe, V.W.V.; Hofman, A.; Moll, H.A.; Veerkamp, J.S.J.

    2012-01-01

    This study was embedded in the Generation R Study, a population-based prospective cohort study from fetal life until young adulthood. This study focused on the relationship between Deciduous Molar Hypomineralization (DMH) and Molar Incisor Hypomineralization (MIH). First permanent molars develop

  17. Función del tercero en la mediación

    Directory of Open Access Journals (Sweden)

    Héctor Gallo

    2014-10-01

    Full Text Available El presente texto se ocupa deformalizar desde el psicoanálisis elconcepto de tercero, precisa en quéconsiste su función subjetiva y socialen la mediación, argumenta porqué es necesario contar con su presenciasimbólica en el campo de losvínculos humanos, da cuenta de surelación con la noción lacaniana deNombre del Padre y especifica quéfunción cumple en la civilización delos vínculos humanos, ya que estosno se producen de manera natural.

  18. Dispositivo de seguridad para controlar mejor el tercer molar impactado durante exodoncia: Una nueva técnica Security device for a better control of impacted third molars during exodontia: A new technique

    Directory of Open Access Journals (Sweden)

    F. Hernández Altemir

    2005-04-01

    Full Text Available El desplazamiento accidental del tercer molar impactado es una complicación que ocurre de vez en cuando durante la exodoncia. La recuperación de estos dientes accidentalmente desplazados puede ser compleja debido a la mala visibilidad y el espacio limitado. Describimos una técnica fácil basada en un sistema de anclaje para controlar mejor los terceros molares impactados durante la exodoncia.Accidental displacement of impacted third molars is a complication that occasionally occurs during exodontia. The retrieval of these accidentally displaced third molars may be complex due to poor visibility and limited space. We describe an easy technique for a better control of impacted third molars during exodontia based on an anchoring system.

  19. Second molar germectomy and third molar eruption. 11 cases of lower second molar enucleation.

    Science.gov (United States)

    Gaumond, G

    1985-01-01

    Eleven cases followed from enucleation of the unerupted lower second molars through third molar eruption. While results were generally good, three presented third molar malpositions requiring further treatment.

  20. [Hyperthyroidism in molar pregnancy].

    Science.gov (United States)

    Boufettal, H; Mahdoui, S; Noun, M; Hermas, S; Samouh, N

    2014-03-01

    Hyperthyroidism is a rare complication of molar pregnancy. We report a 39-year-old woman who presented a thyrotoxic syndrome accompanying a molar pregnancy. Serum thyroid hormones were elevated and returned to normal level after uterine evacuation of a molar pregnancy. The authors detail the role of thyroid stimulating property of human gonadotropin chorionic hormone and its structural changes during the gestational trophoblastic diseases. These changes give the latter the thyroid stimulating properties and signs of hyperthyroidism. Molar pregnancy may be a cause of hyperthyroidism. The diagnosis of molar pregnancy should be a mention to thyrotoxicosique syndrome in a woman of childbearing age. Copyright © 2013. Published by Elsevier SAS.

  1. Glucocorticoides como profiláctico antinflamatorio en cirugía de terceras molares inferiores.

    OpenAIRE

    Manrique-Guzmán, Jorge; Facultad de Odontología de la Universidad Nacional Federico Villarreal. Lima.; Chávez-Reátegui, Beatriz; Facultad de Estomatología. Universidad Peruana Cayetano Heredia. Lima.; Manrique-Chávez, Jorge; Facultad de Estomatología. Universidad Peruana Cayetano Heredia. Lima.

    2014-01-01

    Objetivo: Comparar la presencia de inflamación aguda severa en pacientes con y sin medicación antes del procedimiento de exodoncia de terceros molares inferiores, atendidos en la Clínica Odontológica de la Universidad Nacional Federico Villarreal. Material y métodos: Se tomó como muestra 116 pacientes de ambos sexos, entre 21 y 45 años de edad los cuales fueron divididos en dos grupos aleatoriamente, solo uno recibió medicación con Glucocorticoides antes del tratamiento. Resultados: Se encont...

  2. La hipomineralización incisivo molar y la caries dental

    OpenAIRE

    Negre Barber, Adela

    2017-01-01

    La formación dental es un proceso largo y complejo que se inicia antes de nacer y termina con la mineralización de los terceros molares al final de la adolescencia. Durante este tiempo, cualquier alteración en el órgano dental puede derivar en un defecto en el desarrollo del esmalte (DDE) observándose al erupcionar el diente.La caries dental y los defectos del esmalte son actualmente los problemas mas frecuentes observados en la dentición temporal y joven permanente. Existen protocolos de pre...

  3. Optimización de la antibioterapia en cirugía del tercer molar incluido

    OpenAIRE

    Iglesias Martin, Fernando

    2015-01-01

    OBJETIVOS. El objetivo de este trabajo fue comparar el uso de amoxicilina 1.000 mg frente a amoxicilina/clavulánico 875/125 mg tras la extracción de terceros molares mandibulares incluidos para la prevención de complicaciones infecciosas, estudiar qué pauta antibiótica de las propuestas es más efectiva en la prevención de las complicaciones inflamatorias postoperatorias (entendiendo como complicaciones inflamatorias el dolor, la inflamación, el trismo y la fiebre) y analizar...

  4. Removable molar power arm

    Directory of Open Access Journals (Sweden)

    Raj Kumar Verma

    2013-01-01

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

  5. El rol de los contribuyentes, responsables y terceros en el intercambio de información entre administraciones tributarias

    Directory of Open Access Journals (Sweden)

    Juan Eduardo Leonetti

    2012-01-01

    Full Text Available Al analizar los convenios de intercambio de información suscritos entre las diversas administraciones tributarias surge claramente que salvo en lo que al secreto fiscal o profesional se refiere los contribuyentes, y aun los terceros que pueden resultar afectados por estos procedimientos, son los verdaderos convidados de piedra del sistema. resultan ser muy pocas las posibilidades de participar que se les ofrecen, y en casi todos los casos es- tas son notoriamente insuficientes. Por eso no debe extrañarnos que por lo general esos contribuyentes, responsables o terceros se muestren reticentes aún más que de costumbre con los requerimientos provenientes de extraña jurisdicción, no debiéndose perder de vista que los obligados lo están en la misma medida en que el régimen jurídico desde donde declaran sus ingresos les exige hacerlo. A partir del análisis del paradigma de convenio propuesto como modelo por la organización para la Cooperación y el desarrollo Económico (oCdE, organismo internacional al que muchos Estados adhieren, este trabajo intenta resaltar la importancia de sopesar los derechos de los fiscos para contar con la información por un lado, y el respeto irrestricto que los derechos de los contribuyentes y terceros merecen en todo Estado de dere- cho por el otro.

  6. Ruptured tubal molar pregnancy

    African Journals Online (AJOL)

    2011-05-19

    May 19, 2011 ... Nigerian Journal of Clinical Practice • Oct-Dec 2012 • Vol 15 • Issue 4. Yakasai, et al.: Tubal molar pregnancy follow-up using serial βhCG measurements similar to other trophoblastic tumors.[6] The outcome of the treatment of these patients is similar to those coming with non-molar ectopic gestation.

  7. Biomechanics in Molar Control

    OpenAIRE

    Rendón Giraldo, Juan Esteban; Castaño, Gabriel

    2014-01-01

    Inadequate molar control is one of the difficulties that arise during mechanical treatment. When molar control is handled efficiently, it facilitates precise control of forces and moments, which increases the effectiveness of biomechanics. Knowledge of 4 x 2, 6 x 2 partial systems and the transpalatal bar with its different forms of activation offer a number of advantages that make it possible to optimize orthodontic results. The aim of this article is to clarify concepts, specify possible tr...

  8. Third molar infections.

    Science.gov (United States)

    Gutiérrez-Pérez, José Luis

    2004-01-01

    Pericoronitis is an infectious disease often associated with the eruption of a third molar. It can be either acute (serous and suppurative) or chronic. Pain is usually the predominant symptom in acute stages, whereas chronic forms of the disease may display very few symptoms. Both present exudate. The infection is multimicrobial, predominantly caused strictly by betalactamase-producing anaerobeic microorganisms. Treatment measures are symptomatic, antimicrobial and surgical. Antimicrobial treatment is indicated for preoperative prophylaxis when there is a high risk of postoperative infection and, during the acute stages of suppurative pericoronitis when surgery must be postponed. First-line treatment in this case consists of amoxicillin with associated clavulanic acid. Although surgical treatment of pericoronitis presenting at the third molar is indicated as a Grade C recommendation for extraction, it is the most common indication for extraction of a retained third molar, owing to the improved quality of life it can offer the patient.

  9. La Cooperativa de Luz y Fuerza de Río Tercero: una institución al servicio de su comunidad, 1933- 1953

    Directory of Open Access Journals (Sweden)

    María Elena Rodríguez

    2006-01-01

    Full Text Available En nuestro país, las cooperativas eléctricas surgieron a partir de la década de 1920 como reacción popular frente a las elevadas tarifas y al deficiente servicio proporcionado por las empresas de capital extranjero que tenían a su cargo la generación y la distribución de energía. La provincia de Córdoba no fue ajena a este fenómeno, en este artículo nos proponemos mostrar las circunstancias en que surgió la Cooperativa de Luz y Fuerza de Río Tercero en 1933, la que a diferencia de otras de la provincia de Córdoba no generaba la energía que distribuía sino que la compraba a la usina hidráulica del dique Río Tercero, y al mismo tiempo resaltar también su evolución y las repercusiones de su gestión durante las dos primeras décadas de vida en las que prestó el servicio de energía eléctrica y comenzó con las gestiones encaminadas a concretar la provisión de agua corriente a la población de Río Tercero, convirtiéndose en la Cooperativa de Luz y Fuerza y Agua Potable de Río Tercero Limitada inaugurando ese servicio en 1953.In our country, the electric cooperatives appeared in the 1920's decade as a popular reaction against the high bills and deficient service given by the enterprices of abroad capital that were in charge of energy generation and distribution.The Córdoba's province was not indifferent to this phenomenon, in this article we have the purpose to show the circumstances in which have place the Cooperativa de Luz y Fuerza de Río Tercero in 1933, this was different from the others in Córdoba's province because it did not generate the energy that distributed but bought it to the hydraulic usine of Rio Tercero's dock, and at the same time we want to rebound its evolution and the repercussions of its work during its first two decades of life in which it supplied of electric energy and began to negotiate to bring running water to the population of Rio Tercero, inaugurating that service in 1953 and becoming

  10. Determinación de indicadores de eutrofización en el embalse Río Tercero, Córdoba (Argentina Determination of trophic indicators in Rio Tercero reservoir, Cordoba (Argentina

    Directory of Open Access Journals (Sweden)

    Claudia Ledesma

    2013-09-01

    Full Text Available La eutrofización es una de las problemáticas ambientales más importantes de lagos y embalses. El embalse Río Tercero (Argentina se encuentra afectado por diversas actividades antrópicas que impactan negativamente sobre el recurso. A la hora de generar un programa de monitoreo de los sistemas acuáticos, una de las consideraciones más importante es poder definir las variables más significativas. El análisis multivariado se presenta como una herramienta alternativa. El objetivo de este trabajo fue determinar la calidad del agua y estado trófico del embalse Río Tercero, con el fin de generar bases para una adecuada gestión de los recursos hídricos. Se realizaron campañas de muestreos durante los años 2003 a 2006 donde se midieron parámetros de calidad del agua. Se determino el estado trófico del reservorio. Se realizó un análisis multivariado, generando una matriz de correlación y un análisis de componentes principales (ACP. El embalse experimentó un deterioro en su calidad, pasando desde un estado de mesotrófico a eutrófico. Se demostró que existe correlación positiva entre la clorofila- a y las variables fósforo total (r = 0.83, oxigeno disuelto (r = 0.51 y temperatura (r = 0.43. El ACP explicó el 65,6% de la variabilidad total de los datos. El análisis multivariado estableció que las variables más significativas para explicar la variabilidad en el reservorio fueron clorofila-a, fósforo total y temperatura, lo que demuestra que los florecimientos algales deberían ocurrir en las estaciones primavera-verano. Los resultados obtenidos permiten generar un programa preliminar de monitoreo y gestión extrapolable a otros recursos acuáticos.Eutrophication is one of the most important environmental problems in lakes and reservoirs. Río Tercero reservoir (Argentina is affected by various human activities that impact negatively on the system. When generating a monitoring program of aquatic systems, one of the most important

  11. Excess Molar Volumes and Partial Molar Volumes of Binary Systems ...

    African Journals Online (AJOL)

    NJD

    Excess molar volumes have been evaluated from density measurements over the entire composition range for binary systems of an ionic liquid ... was used to fit the excess molar volume data and the partial molar volumes were determined from the Redlich-Kister coefficients. ... ture below the boiling point of water. Most of ...

  12. Integración del contenido fracciones para el multigrado tercero-cuarto de la educación primaria

    Directory of Open Access Journals (Sweden)

    Orlando Perdomo-Hernández

    2017-11-01

    Full Text Available Las escuelas primarias rurales pueden ser graduadas o multigradas. Las graduadas adoptan la misma organización que las urbanas, las multigradas tienen otra forma de organización para atender simultáneamente por un maestro, en una misma aula, a escolares de distintos grados. Una tarea a enfrentar por dichos maestros es la integración de contenidos en la clase para diferentes grados y asignaturas, cuestión esta que constituye una problemáticapor su complejidad. Atendiendo a ello, se presenta en este trabajo una propuesta de integración de contenidos de fracciones en la asignatura Matemática y una clase ejemplo para el multigrado tercero-cuarto.

  13. Taurodontism in deciduous molars.

    Science.gov (United States)

    Bafna, Yash; Kambalimath, H V; Khandelwal, Vishal; Nayak, Prathibha

    2013-06-03

    Taurodont teeth are characterised by large pulp chambers at the expense of roots. An enlarged pulp chamber, apical displacement of the pulpal floor and no constriction at the level of the cement-enamel junction are the characteristic features of taurodont tooth. It appears more frequently as an isolated anomaly but its association with syndromes and other abnormalities have also been reported. Permanent dentition is more commonly affected than deciduous dentition. This paper presents a case report of taurodontism in relation to mandibular deciduous second molars.

  14. Análisis axiológico de las posibles regulaciones del sistema de responsabilidad civil frente a terceros de las Calificadoras de Riesgo y Auditorías de cuentas

    National Research Council Canada - National Science Library

    Andrés Mendive Dubourdieu

    2015-01-01

    En el presente trabajo nos proponemos analizar los posibles sistemas de responsabilidad civil de las calificadoras de riesgo y auditores de cuentas frente a terceros desde una perspectiva axiológica...

  15. MOLAR TOOTH SIGN - JOUBERT SYNDROME

    Directory of Open Access Journals (Sweden)

    Dušica Ranđelović

    2015-09-01

    Full Text Available The molar tooth sign is seen in very few conditions and is a very rare pediatric central nervous system congenital anomaly. Molar tooth sign is the result of cerebellar vermis hypoplasia, thick and maloriented superior cerebellar peduncles, and an abnormally deep interpeduncular fossa. In Joubert syndrome, this is seen in about 85% of patients. We present a case of a two-year old girl with flaccid paraparesis, regression of milestones and developmental delay. Magnetic resonance imaging (MRI showed the characteristic molar tooth sign with apposition of cerebellar hemispheres, batwing-shaped fourth ventricle, cerebellar vermis agenesis and deep interpeduncular fossa consistent with the diagnosis of Joubert syndrome.

  16. Exodoncia del tercer molar: Factores que determinan complejidad

    Directory of Open Access Journals (Sweden)

    Ivan Manotas Arevalo

    2014-06-01

    Full Text Available ResumenUno de los procedimientos más frecuentes en el campo de la Cirugía Oral es la exodoncia, o extracción dental. La prevención y la promoción de hábitos saludables dentro de los que se cuenta la práctica del cepillado dental, uso de dentífricos, hilo dental y enjuagatorios bucales, además de visitas periódicas de control a especialistas y odontólogos generales e higienistas bucales ha conllevado a una reducción en la perdida de estructuras dentarias por causa de la caries y las periodontopatìas. Sin embargo se mantiene alto el número de exodoncias indicadas por falta de espacio en la estructura de los maxilares para la erupción dental, así como alteraciones en la posición y angulacion de los órganos dentales sobre su eje que impide una adecuada ubicación logrando que se indique su extracción. Dentro de la serie dental los órganos dentarios más frecuentemente afectados por este tipo de alteraciones son los terceros molares. También se mencionan que son esos mismos dientes los que acusan mayor grado de complejidad para realizar el procedimiento de exodoncia, y los que causan mayor grado de morbilidad posquirúrgica en el paciente, con un número mayor de complicaciones y su severidad, descritas en la literatura. (Duazary 2008; 141-147. Este artículo pretende analizar los factores que determinan complejidad en la exodoncia del tercer molar a partir de una revisión bibliografía y comparación de ésta.AbstractOne of the most frequent procedure used in the field of Oral Surgery is extracted, or tooth extraction. The prevention and promoting healthy habits in mind that the practice of brushing teeth, use of toothpastes, mouthwashes and dental floss mouth, in addition to regular monitoring visits to specialists and general dentists and oral hygiene has led to a reduction in the loss of structures caused by tooth decay and periodontal pathology. However remains high number of extractions indicated by lack of space in the

  17. Relación entre el perfil psicológico del paciente y la calidad de vida tras la extracción quirúrgica del tercer molar inferior

    OpenAIRE

    Fuster Torres, Mª Ángeles

    2016-01-01

    La evolución postoperatoria tras la extracción de los terceros molares depende de una serie de factores propios de cada paciente y de factores propios de la intervención quirúrgica. Pero algunos factores, principalmente psicológicos y psicosociales, pueden ser importantes cuando analizamos la sintomatología del paciente, el riesgo de complicaciones crónicas y la resolución de los síntomas. Se conoce muy poco sobre qué potencial predictivo tienen las alteraciones psicológicas preoperatorias so...

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

    Directory of Open Access Journals (Sweden)

    José Manuel Díaz Fernández

    1998-12-01

    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.

  19. Excess Molar Volumes and Partial Molar Volumes of Binary Systems ...

    African Journals Online (AJOL)

    Excess molar volumes have been evaluated from density measurements over the entire composition range for binary systems of an ionic liquid (IL) and an alcohol at T = (298.15, 303.15 and 313.15) K. The IL is 1-butyl-3-methylimidazolium methylsulphate [BMIM]+[MeSO4]– and the alcohols are methanol, ethanol or ...

  20. Supernumerary molars. A review of 53 cases

    OpenAIRE

    Menardía Pejoan, V.; Berini Aytés, Leonardo; Gay Escoda, Cosme

    2000-01-01

    Supernumerary molars are not uncommon and may be found nearly anywhere in the dental alveolar arches. A series of 36 patients that presented with 53 supernumerary molars are reviewed. They occurred more frequently in the maxilla (86.8%), had little or no clinical significance, tended to be impacted, and were not associated with the impactation of the third molar. Four cases of maxillary fifth molars are described

  1. Impacted lower third molars and distal caries in the mandibular second molar. Is prophylactic removal of lower third molars justified?

    Science.gov (United States)

    Marques, José; Montserrat-Bosch, Marta; Vilchez-Pérez, Miguel-Angel; Valmaseda-Castellón, Eduard; Gay-Escoda, Cosme

    2017-01-01

    Background The objective of this study was to evaluate the association between the presence of mandibular third molars and the occurrence of carious lesions in the distal aspect of the mandibular second molar. Material and Methods A retrospective cohort study comprising 327 lower third molars extracted in the Oral Surgery and Implantology Master’s Degree program of the School of Dentistry of the University of Barcelona (Barcelona, Spain) was carried out. A descriptive and bivariate analysis was made. The diagnosis of caries in the second molar and the position of the mandibular third molar were evaluated through panoramic radiographies. Results The sample included 203 patients, 94 males (46.3%) and 109 females (53.7%), with a mean age of 26,8 years and 327 lower third molars. The prevalence of second molar distal caries was 25.4% (95% CI= 20.6% to 30.2%). This pathology was significantly more frequent when the third molar was in a horizontal position (27.7%), when the contact point was at (45,8%) or below (47.0%) the cementoenamel junction (CEJ), and when the distal CEJ of the mandibular second molar and the mesial CEJ of the third molar was 7 to 12 mm apart. Conclusions Horizontal lower third molars with contact points at or below the CEJ are more likely to produce distal caries in the mandibular second molars. Due to the high prevalence of this pathology (20.6% to 30.2%), a prophylactic removal of lower third molars with the above-mentioned features might be advisable. Key words:Second molar, caries, third molar, prophylactic removal. PMID:28638558

  2. Third molar complications requiring hospitalization.

    Science.gov (United States)

    Kunkel, Martin; Morbach, Thomas; Kleis, Wilfried; Wagner, Wilfried

    2006-09-01

    The aim of this study was to describe demographic and clinical patterns of subjects hospitalized with complications associated with third molars (M3). The investigation was designed as a prospective cohort study composed of subjects admitted to hospital for management of M3-associated complications. The predictor variable was "clinical status of the M3" defined as (A) prophylactic M3 removal, (B) nonelective M3 removal, or (C) M3 present at the time of admission. Outcome variables were infection parameters, treatment costs, length of hospital stay, and days of disability. Postoperative complications (A and B) were compared to complications based on pericoronitis (C). Complications due to prophylactic removal (A) were compared to those arising from pericoronitis or from the removal of symptomatic teeth (B and C). From January 2003 to December 2004, 45 deep space infections, 6 mandibular fractures, 2 lingual nerve injuries, 1 parapharyngeal tooth luxation, and 1 osteomyelitis were noticed. Fifteen complications resulted from prophylactic surgery (A), 25 from nonelective removal (B), and 15 from pericoronitis (C). Direct treatment costs were 147,000 euro (A: 42,000 euro; B: 74,000 euro; C: 31,000 euro). In 10 of the 15 patients of group C, deep space involvement resulted immediately from the first episode of pericoronitis. Neither clinical markers of infection nor economic parameters showed significant differences between the groups. Within the catchment area of our institution, the majority of third molar-related hospitalizations resulted from diseased third molars or their removal.

  3. Graduación de la responsabilidad civil del empresario y de los grupos de empresas -matrices y filiales- de Roma frente a terceros

    Directory of Open Access Journals (Sweden)

    Guillermo Suárez Blázquez

    2011-01-01

    negocios de los sometidos a patria potestad. Sin embargo, estas acciones no se caracterizan solo por tener fórmulas con transposición de sujetos. Tampoco se debe ceñir su competencia al derecho de familia. Esta tesis, aceptada de forma mayoritaria para la doctrina romanista y civilista actual, debe ser revisada. La tesis que proponemos es la extensión de estas acciones procesales al campo jurídico de la empresa, de las mercancías y del comercio, pues fueron creadas por los pretores, y desarrolladas por la jurisprudencia clásica, para conseguir un objetivo: determinar el alcance y la medida de la responsabilidad civil del comerciante, del empresario, de las empresas matrices y de las empresas filiales, en suspensión de pagos, frente a terceros ¿proveedores y clientes¿.

  4. CANINE ECTOPIC TREATMENT WITH FIRST MOLAR EXTRACTION

    Directory of Open Access Journals (Sweden)

    Angelica Margo

    2015-06-01

    Full Text Available Decision to extract or not and the type of tooth must be analyzed carefully in orthodontic treatment. Preferable tooth to be extracted was the tooth with large caries or restoration. Usually the type of tooth to be extracted was second molar (if the third molar appears, incisor, first molar, and combination of several teeth. Orthodontic treatment with molar extraction is more difficult to treat and the result is usually compromise. There are several considerations in extracting first molar such as tooth with large caries or restoration, hypoplasia, periapical disease, large discrepancy, high maxilla-mandibular plane angle, and cases with anterior open bite. Nowadays, orthodontic cases with molar extraction do not prolong the treatment time compared to premolar extraction case, but the anchorage system must be considered carefully. The present case was treated with extraction of first molar to solve anterior crowding with maximum anchorage at the upper jaw and using Nance Holding Appliance.

  5. Anaesthetic Challenges in Molar Pregnancy

    Directory of Open Access Journals (Sweden)

    Ghansham Biyani

    2013-06-01

    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.

  6. Pulpectomy procedures in primary molar teeth

    OpenAIRE

    Hany Mohamed Aly Ahmed

    2014-01-01

    Premature loss of primary molars can cause a number of undesirable consequences including loss of arch length, insufficient space for erupting premolars and mesial tipping of the permanent molars. Pulpectomy of primary molar teeth is considered as a reasonable treatment approach to ensure either normal shedding or a long-term survival in instances of retention. Despite being a more conservative treatment option than extraction, efficient pulpectomy of bizarre and tortuous root canals encased ...

  7. Mandibular lip bumper for molar torque control.

    Science.gov (United States)

    Celentano, Giuseppe; Longobardi, Annalisa; Cannavale, Rosangela; Perillo, Letizia

    2011-01-01

    Treatment effects of lip bumpers alone include flaring of the mandibular incisors, distalization and uprighting of the mandibular first molars, and buccal expansion of the canines, premolars, and molar. Lip forces are transmitted through this appliance onto the molars. Moreover the lip bumper is able to derotate, expand or constrict, upright and reinforce the anchorage whereas torque control is lacking. Aim of this paper is the presentation of a new type of lip bumper that allows the molar torque control. Copyright © 2011 Società Italiana di Ortodonzia SIDO. Published by Elsevier Srl. All rights reserved.

  8. Permanent molars: Delayed development and eruption

    Directory of Open Access Journals (Sweden)

    Arathi R

    2006-05-01

    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.

  9. Assessment of association between molar incisor hypomineralization and hypomineralized second primary molar

    National Research Council Canada - National Science Library

    Rakesh Mittal; Shweta Chandak; Manisha Chandwani; Prabhat Singh; Jitesh Pimpale

    2016-01-01

      Background: The term molar incisor hypomineralization (MIH) has been described as a clinical entity of systemic origin affecting the enamel of one or all first permanent molars and also the incisors...

  10. [Hyperthyroidism induced by molar pregnancy].

    Science.gov (United States)

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

    1993-01-01

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

  11. Relación entre inteligencia emocional y notas de las áreas instrumentales en un grupo de tercero de primaria

    Directory of Open Access Journals (Sweden)

    Vicent Alfaro Mateu

    2016-01-01

    Full Text Available La finalidad de este trabajo es conocer si existe relación entre las áreas instrumentales, lengua y matemáticas, y la Inteligencia emocional de un grupo de alumnos de tercero de primaria de un centro concreto. Participaron 26 alumnos a los cuales se aplicó el instrumento test EQ-­‐i YV de BarOn adaptado para los alumnos. Las técnicas de análisis de correlación a través del SPSS permitirán comprobar si existe o no correlación entre la Inteligencia Emocional de los alumnos, los distintos aspectos de la misma y las áreas instrumentales. En los resultados encontrados no existe correlación entre matemáticas y lengua castellana y el total del cuestionario. La correlación entre las áreas instrumentales, lengua castellana y matemáticas es altamente significativa. Del mismo modo, el total de resultados del cuestionario “E” correlaciona positivamente con las partes del cuestionario “A”, “B”, “C” y “D”, remarcando que hay una alta correlación entre el factor intrapersonal (“B” y el factor de adaptabilidad (“D”. En conclusión, no existe una correlación directa entre las notas de los estudiantes y los resultados del test de inteligencia emocional.

  12. Meta-percepciones de competencia de terceros significativos, competencia percibida, motivación situacional y orientaciones de deportividad en jóvenes deportistas

    Directory of Open Access Journals (Sweden)

    Jos\\u00E9 Antonio Cecchini Estrada

    2014-01-01

    Full Text Available La finalidad de este estudio es comprobar un modelo teórico sobre la base de las aportaciones de Vallerand (1977 que incluya, como factores sociales, la meta-percepción de competencia de múltiples terceros significativos. Asimismo, el modelo recoge la relación entre la motivación auto-determinada situacional (SDI y las orientaciones de deportividad en deportes de contacto medio-alto. La muestra estuvo formada por 496 jugadores/as de fútbol y baloncesto, con edades comprendidas entre 11-17 años (M= 14.19, DE = 1.84. Los resultados mostraron que la meta-percepción de competencia del entrenador fue el principal predictor de la competencia percibida por los deportistas, seguida de la meta-percepción de los padres, del profesor de educación física y de los compañeros de equipo. En su conjunto muestran un valor predictivo elevado. La competencia percibida fue, a su vez, un predictor significativo de la SDI y, ésta, predijo sucesivamente las diferentes orientaciones hacia la deportividad de manera consistente.

  13. Programa para el Bienestar y Aprendizaje Socioemocional en estudiantes de tercero y cuarto grado: descripción y evaluación de impacto

    Directory of Open Access Journals (Sweden)

    Christian Berger

    2014-01-01

    Full Text Available El presente trabajo describe un programa para favorecer el bienestar y aprendizaje socioemocional en estudiantes de tercer y cuarto año de Enseñanza General Básica, y su evaluación de impacto. Los fundamentos conceptuales del programa para el Bienestar y Aprendizaje Socioemocional se apoyan en la perspectiva del aprendizaje socioemocional, que integra factores tanto en el ámbito individual como del contexto. El programa enfatiza el desarrollo de vínculos interpersonales de calidad y el desarrollo de las competencias necesarias para ello. A través de un diseño cuasiexperimental que incluyó a 647 estudiantes de tercero y cuarto grado en cinco colegios particulares subvencionados de Santiago, Chile, la evaluación con análisis de la varianza de medidas repetidas mostró un impacto del programa en la autoestima de los estudiantes percibida por sus profesores (medida a través del test de autoestima. Asimismo, el programa mitigó el descenso en la percepción del clima escolar según la Escala de Clima Social, en indicadores de integración social, y en el rendimiento escolar, que se observó en el grupo control. Se discuten los resultados del programa y sus posibles implicancias para el desarrollo de intervenciones en este campo.

  14. Third molar agenesis and craniofacial morphology.

    Science.gov (United States)

    Sánchez, María José; Vicente, Ascensión; Bravo, Luis Alberto

    2009-05-01

    To test the null hypothesis that agenesis of wisdom teeth is not related with any particular craniofacial morphology. Ninety-seven patients (aged 13-19 years) were selected and divided into three groups: (1) bilateral agenesis of maxillary third molars, (2) bilateral agenesis of mandibular third molars, and (3) control group without agenesis. Presence or absence of third molars was determined using ortopantomographs. Cephalometric analysis was carried out from lateral teleradiographs, which included linear, angular, and proportional measurements. When data obtained were distributed normally it was analyzed by means of single-factor variance analysis and the Scheffé test (P classification in 58.8% of cases. The hypothesis is rejected. Agenesis of the maxillary third molars was related to a reduced mandibular plane angle. Patients with agenesis of the mandibular third molars showed a diminished lower third and a mandibular morphology characteristic of the brachyfacial pattern.

  15. Bilateral maxillary fourth and fifth molars: An unusual radiographic appearance

    Directory of Open Access Journals (Sweden)

    Mukesh Khemchand Asrani

    2016-01-01

    Full Text Available Distomolars are supernumerary teeth present distal to third molars. Although many cases of bilateral fourth molars are reported, very few cases having bilateral fifth molars are described in literature. Here, we present a case having bilateral impacted maxillary fourth and fifth molars with the fifth molar on the left side having an unusually small appearance.

  16. The influence of premature loss of temporary upper molars on permanent molars.

    Science.gov (United States)

    Cernei, E R; Maxim, Dana Cristiana; Zetu, Irina Nicoleta

    2015-01-01

    Premature loss of primary molars due to dental caries and their complications has been associated with space loss and eruptive difficulties, especially when the loss occurs early. The aim of our study was to determine the impact of premature loss of temporary upper molars upon the longitudinal axis of the first and second upper permanent molar. The study group included 64 patients 6-9 years old with premature loss of primary molars and a control group of 48 patients with intact temporary teeth. It was evaluated the angle between longitudinal axis of first and second upper permanent molars and occlusal plane. The sofware used is Easy Dent 4 Viewer®.The data were analyzed by using the Statistical Package for the Social Sciences (version 20.0; SPSS, Chicago, III). It was observed that premature loss of upper second deciduous molars modifies greater the vertical axis of the permanent molars than the premature loss of first upper primary molar. First upper primary molar loss cause an acceleration eruption of first premolar, which will produce a distal inclintion of the both permanent molars. The use of space maintainers after premature loss of the second upper temporary molar is a last solution in preventing tridimensional lesions in the dental arch and occlusion.

  17. [Correlation between the lower first permanent molar axis and the premature loss of temporary molars].

    Science.gov (United States)

    Petcu, Ana; Maxim, A; Haba, Danisia

    2009-01-01

    The aim of our study was to determine the impact of premature loss of temporary molars upon the longitudinal axis of the first permanent molar. The study sample was formed by 94 orthopanthomografies of child patients with premature loss of lower temporary molars (first or second) after clinical eruption of the first permanent molar. All panoramic radiographs have been realized with the same panoramic unit with 1.4% magnification coefficient and were analyzed using a standardized technique of tracing the images of teeth and bone on matte acetate paper. It was evaluated the angle between longitudinal axis of first permanent lower molar and occlusal plane. It was observed that premature loss of lower second deciduous molar modifies greater the vertical axis of first permanent molar (between 61 degrees and 79 degrees) then premature loss of first lower primary molar. This is perhaps because the loss of space in the case of premature exfoliation of first primary molar is due more to distal drift of canine then mesial drift of molars. The drift to mesial of first permanent molar is more accentuated proportional with the age at which appeared premature loss and so it is loss of leeway space.

  18. Maxillary second molar impaction in the adjacent ectopic third molar: Report of five rare cases

    Science.gov (United States)

    Souki, Bernardo Q.; Cheib, Paula L.; de Brito, Gabriela M.; Pinto, Larissa S. M. C.

    2015-01-01

    Maxillary second molar impaction in the adjacent ectopic third molar is a rare condition that practitioners might face in the field of pediatric dentistry and orthodontics. The early diagnosis and extraction of the adjacent ectopic third molar have been advocated, and prior research has reported a high rate of spontaneous eruption following third molar removal. However, some challenges in the daily practice are that the early diagnosis of this type of tooth impaction is difficult with conventional radiographic examination, and sometimes the early surgical removal of the maxillary third molar must be postponed because of the risks of damaging the second molar. The objective of this study is to report a case series of five young patients with maxillary second molar impaction and to discuss the difficulty of early diagnosis with the conventional radiographic examination, and unpredictability of self-correction. PMID:26321848

  19. Maxillary second molar impaction in the adjacent ectopic third molar: Report of five rare cases

    Directory of Open Access Journals (Sweden)

    Bernardo Q Souki

    2015-01-01

    Full Text Available Maxillary second molar impaction in the adjacent ectopic third molar is a rare condition that practitioners might face in the field of pediatric dentistry and orthodontics. The early diagnosis and extraction of the adjacent ectopic third molar have been advocated, and prior research has reported a high rate of spontaneous eruption following third molar removal. However, some challenges in the daily practice are that the early diagnosis of this type of tooth impaction is difficult with conventional radiographic examination, and sometimes the early surgical removal of the maxillary third molar must be postponed because of the risks of damaging the second molar. The objective of this study is to report a case series of five young patients with maxillary second molar impaction and to discuss the difficulty of early diagnosis with the conventional radiographic examination, and unpredictability of self-correction.

  20. How will mandibular third molar surgery affect mandibular second molar periodontal parameters?

    Science.gov (United States)

    Tabrizi, Reza; Arabion, Hamidreza; Gholami, Mehdi

    2013-07-01

    Several conflicting findings have been published in the previous literature regarding the effects of impacted third molar surgery on the periodontal parameters of the adjacent second molar; some authors have shown improvement of periodontal health distal to the adjacent second molar, whilst others have demonstrated loss of attachment level (AL) and reduction of alveolar bone height. The purpose of this study was to evaluate the changes in periodontal health parameters distal to the adjacent second molar following extraction of an impacted third molar. Out of 50 patients participated in the study, 42 patients completed the study. The mean age of the sample was 20.9 (range, 18-25) years. All teeth were mesioangular impacted mandibular third molars categorized at C1 class based on the Pell and Gregory classification. All surgeries were performed by one surgeon and the same surgeon recorded the pre-operative and post-operative measurements of probing depth (PD) and AL on the distobuccal aspect of the second molars. Data analysis were carried out with the SPSS software (version 19), using the paired-samples t-test and one sample t-test. Surgical extraction of impacted mandibular third molar resulted in a significant increase of PD on the distobuccal aspect of the second molars, whereas AL was decreased significantly after surgery (P molar after extraction of impacted third molar, our study showed a significant increase in PD at the distal aspect of the second molar. Further follow-up on clinical and radiological parameters are required for more profound understanding of the long-term effects of third molar extraction on the periodontal parameters of the adjacent second molar.

  1. Treating Intraradicular Pockets of molars

    Directory of Open Access Journals (Sweden)

    H. Lotfizade

    1987-10-01

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

  2. Sextant of Sapphires for Molar Distalization.

    Science.gov (United States)

    Ponnada, Swaroopa Rani; Palla, Yudistar Venkata; Ganugapanta, Vivek Reddy

    2016-08-01

    Space analysis quantifies the amount of crowding within the arches estimating the severity of space discrepancy. The space gaining procedures include extraction and non-extraction procedures like expansion, proximal stripping and molar distalization. To identify features seen in molar distalization cases. The sample size comprised 20 patients in whom molar distalization was decided as the treatment plan. The study models and lateral cephalograms of all the patients were taken. Occlusograms were obtained. Model analysis and cephalometric analysis were performed. Descriptive statistical analysis like mean, standard deviation, standard error and mode were done. The parameters in Question gave following results. The Bolton analysis showed anterior mandibular excess with mean value of 1.56mm±1.07. The first order discrepancy between maxillary central and lateral incisors was 5±1.95. The premolar rotation showed mean value of 16.58±5.12. The molar rotation showed the value of 7.66±2.26. The nasolabial angle showed the mean of 101.25±8.7 IMPA of 101.4±5.74. The six features studied in molar distalization cases [First order discrepancy between upper central and lateral incisors; Rotation of premolars and molars; Bolton's discrepancy in anterior dentition; Average to horizontal growth pattern; Proclined lower incisors and Obtuse nasolabial angle] can be taken as patterns seen in molar distalization cases and considered as a valid treatment plan.

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

    Directory of Open Access Journals (Sweden)

    C. López Carriches

    2008-10-01

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

  4. Rare occurrence of the left maxillary horizontal third molar impaction ...

    African Journals Online (AJOL)

    Rare occurrence of the left maxillary horizontal third molar impaction, the right maxillary third molar vertical impaction and the left mandibular third molar vertical impaction with inferior alveolar nerve proximity in a 30 year old female: a case report.

  5. Study of kissing molars in Turkish population sample | Yanik ...

    African Journals Online (AJOL)

    Study of kissing molars in Turkish population sample. ... refers to contacting occlusal surfaces of the impacted mandibular second and third molars. ... was to report the incidence of kissing molars (KMs), classification, incorporated pathologies, ...

  6. Molar pregnancy and thyroid storm - literature review

    Directory of Open Access Journals (Sweden)

    Filipescu G. A.

    2017-08-01

    Full Text Available Molar pregnancies results from a tainted fertilization process. Trophoblastic thyroidian hyper function is an unusual complication of a molar pregnancy. The degree of thyroid stimulation and the severity of clinical hyperthyroidism is directly proportional to HCG concentration. Human chorionic gonadotrophin is almost identical with TSH, luteinizing hormone (LH and follicle-stimulating hormone, this analogy in the structure will cause cross-reactivity with their receptors. Hyperthyroid status can vary from asymptomatic hyper function to thyroid storm. Dilation and curettage represents the treatment for hyperthyroidism in molar pregnancy. Awareness of this condition is important for diagnosis and treatment.

  7. Unilateral Molar Distalization: A Nonextraction Therapy

    Directory of Open Access Journals (Sweden)

    M. Bhanu Prasad

    2012-01-01

    Full Text Available In the recent years, nonextraction treatment approaches and noncompliance therapies have become more popular in the correction of space discrepancies. One of the conventional approaches for space gaining in the arches without patient compliance is done by using certain extra oral appliances or intraoral appliance. The greatest advantage of certain appliances like fixed functional and molar distalization appliances is that they minimize the dependence on patient cooperation. Molar distalization appliances like pendulum appliance which distalizes the molar rapidly without the need of head gear can be used in patients as a unilateral space gaining procedure due to buccal segment crowding.

  8. Mini-implant-supported Molar Distalization

    Directory of Open Access Journals (Sweden)

    Amit Goyal

    2012-01-01

    Full Text Available Temporary anchorage devices popularly called mini-implants or miniscrews are the latest addition to an orthodontist′s armamentarium. The following case report describes the treatment of a 16-year-old girl with a pleasant profile, moderate crowding and Angle′s Class II molar relationship. Maxillary molar distalization was planned and mini-implants were used to preserve the anterior anchorage. After 13 months of treatment, Class I molar and canine relation was achieved bilaterally and there was no anterior proclination. Thus, mini-implants provide a viable option to the clinician to carry out difficult tooth movements without any side effects.

  9. Treatment of ectopic first permanent molar teeth.

    LENUS (Irish Health Repository)

    Hennessy, Joe

    2012-11-01

    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.

  10. Efficiency of molar distalization with the XBow appliance related to second molar eruption stage.

    Science.gov (United States)

    Flores-Mir, Carlos; McGrath, L M; Heo, G; Major, P W

    2013-12-01

    To quantitatively evaluate on lateral cephalograms horizontal, vertical, and angular changes in the position of the maxillary first molar based on the presence and absence of erupted maxillary second molars when it is distalized with the XBow appliance. In this retrospective study, a total of 102 consecutively treated cases were assessed. Lateral cephalograms were obtained at the start and after completion of active treatment with the XBow appliance. In one group of patients, distal movement of the maxillary first molars was performed before the eruption of maxillary second molars; in the other group of patients, both first and second maxillary molars were simultaneously moved distally. All cephalograms were superimposed on palatal plane using the method of best-fit. In order to compare the mean horizontal, vertical, and angular changes in molar position between the treatment groups and gender, a multivariate analysis of covariance (MANCOVA) was performed with the pre-treatment class II severity used as a covariate. Regression analysis was also performed to further explore any possible relationships between the predictor variables and the quantity and quality of distalization. A MANCOVA revealed that the eruption stage of the maxillary second molar did not have a significant effect on the change in position of the maxillary first molar after treatment with a XBow appliance. When distalizing maxillary first molars with a XBow appliance, there is no difference in the amount of distalization in patients with erupted and unerupted maxillary second molars.

  11. Acceso al trabajo para los nacionales de terceros países en el territorio de la Unión Europea

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    C. Betsabé LUGO RODRÍGUEZ

    2009-03-01

    Full Text Available RESUMEN: Las políticas actuales de migración europeas tienden a incitar la migración de trabajadores altamente cualificados (fuga de cerebros y a desalentar la migración de los poco o nada cualificados, mismos que al no encontrar vias legales para trabajar en la UE, arriesgan sus vidas tratando de cruzar las fronteras clandestinamente y desempeñan trabajos físicos, a menudo, insalubres, peligrosos e indignos. Con el desarrollo de políticas restrictivas se incrementa la entrada y el trabajo clandestino de inmigrantes que de forma legal bien podrían contribuir económica, social y culturalmente a la UE. A lo largo de los años se han diseñado políticas de migración de provecho unilateral que hacen que Europa reciba los mayores beneficios generados del trabajo de inmigrantes de terceros países, y aunque existen iniciativas para facilitar la entrada legal y luchar contra la explotación de estas personas, es díficil que los Estados miembros lleguen a un acuerdo conjunto. Políticamente la migración es un tema muy delicado. Sin embargo, la fotaleza europea que tiene entre sus objetivos principales la libre circulación de personas y la garantía de los derechos de sus ciudadanos dentro de la UE, debería tomar en cuenta que un porcentaje significativo de su población está compuesta de personas provenientes de terceros países que igual que los ciudadanos europeos merecen ser respetados y tratados como seres humanos.ABSTRACT: The current European migration policy have a tendency to stimulate the migration of workers with high qualifications (brain drain and to discourage the migration of workers with less or no qualifications, those who when don’t find legal ways to work in the EU risk their lives trying to cross the borders clandestinely and carry out physical jobs, often, unhealthy, dangerous and unworthy. The development of restrictive policies increases the entrance and clandestine work of immigrants who in a legal way could

  12. LOS REQUISITOS DE LA LEX AQUILIA, CON ESPECIAL REFERENCIA AL DAÑO: LECTURAS DESDE LAS DISTINTAS TEORÍAS SOBRE EL CAPÍTULO TERCERO

    Directory of Open Access Journals (Sweden)

    Cristian Aedo Barrena

    2009-01-01

    Full Text Available El presente trabajo tiene por objeto hacer un breve repaso de los requisitos que la lex Aquilia exigía para su concurrencia, desde las distintas lecturas que la doctrina romanista moderna ha hecho del capítulo tercero. Así, se muestra de que manera las distintas posiciones influyen en la conceptualización de la Murta, en el desarrollo decretal y, por consiguiente en la relación de causalidad, pero especialmente en el daño, que es el requisito al cual la investigación presta más atención. Así se analiza, según estas diferentes visiones, el desarrollo del principio idquod interest. Claramente, como se ha insinuado en este resumen, se enfrentan dos visiones contrapuestas, entre aquellos que ven en la lex Aquilia un estatuto originariamente resarcitorio (negando incluso el principio corpore corpori y adjudicándolo a la interpretación medieval versus un punto de vista que considera que la ley tenía originariamente un carácter estrictamente penal, derivando paulatinamente hacia un carácter resarcitorio. En el primer punto de vista, el principio id quod interest se presentó desde un comienzo en el capítulo tercero, el que exclusivamente se refería al daño (tesis de Daube; desde el segundo punto de vista, la interpretación permitió la evolución desde el premium corporis hasta el principio id quod interest, en el punto de vista afirmado desde Jolowicz y recientemente sustentado por Valditara.This paper aims to make a brief review of the requirements that the lex Aquilia required for its concurrence, from the various readings that the modern Roman law doctrine has made the third chapter. Thus, it shows how the different positions that influence the conceptualization of iniuria, in the development decretal, and therefore in terms of causality, but especially in the damage, which in that part of that research pays more attention. So is analyzed, as these various visions, the development of the principle id quod interest. Clearly, as

  13. A Molar Pregnancy within the Fallopian Tube

    Directory of Open Access Journals (Sweden)

    Laura Allen

    2016-01-01

    Full Text Available Background. Discussion of the incidence of molar pregnancy and ectopic pregnancy. Role of salpingostomy and special considerations for postoperative care. Case. The patient is a 29-year-old G7P4 who presented with vaginal bleeding in the first trimester and was initially thought to have a spontaneous abortion. Ultrasound was performed due to ongoing symptoms and an adnexal mass was noted. She underwent uncomplicated salpingostomy and was later found to have a partial molar ectopic pregnancy. Conclusion. This case illustrates the rare occurrence of a molar ectopic pregnancy. There was no indication of molar pregnancy preoperatively and this case highlights the importance of submitting and reviewing pathological specimens.

  14. IMPLICATIONS OF PREMATURE LOSS OF PRIMARY MOLARS

    Directory of Open Access Journals (Sweden)

    Ana PETCU

    2016-06-01

    Full Text Available The pathology of premature loss of temporary molars is a complex issue with profound impact on dental and facial harmony, urging clinician`s interest for an optimal therapeutic approach. Identification of the predisposing factors, in full agreement with the anatomical particularities of the temporary teeth, corroborated with the incidence of premature loss of molars is a main condition for an optimal therapeutic management of these patients.

  15. Efficiency of a pendulum appliance for molar distalization related to second and third molar eruption stage.

    Science.gov (United States)

    Kinzinger, Gero S M; Fritz, Ulrike B; Sander, Franz-Günter; Diedrich, Peter R

    2004-01-01

    A modified pendulum appliance, including a distal screw and special preactivated pendulum springs (built-in straightening activation and toe-in bending), was used for bilateral maxillary molar distalization in 36 adolescent patients in various stages of the molar dentition. The patients were divided into 3 groups (PG 1-3) according to the stage of eruption of their second and third molars. In PG 1 (18 patients), eruption of the second molars had either not yet taken place or was not complete. In PG 2 (15 patients), the second molars had already developed as far as the occlusal plane, with the third molars at the budding stage. In PG 3 (3 patients), germectomy of the wisdom teeth had been carried out, and the first and second molars on both sides had completely erupted. Analysis of cephalograms to identify any changes in the sagittal plane showed that, in the direction of distalization, a tooth bud acts on the mesial neighboring tooth like a fulcrum, and that tipping of the first molars in patients in whom the second molar was still at the budding stage was thus greater. In patients whose second molars had erupted completely, the degree of tipping was greater again when a third molar bud was located in the direction of movement. After previously completed germectomy of the wisdom teeth, almost exclusively bodily distalization of both molars is possible, even without bands being applied to the second molars. However, if the first and second molars are distalized simultaneously with a pendulum appliance, the duration of therapy will be longer, greater forces will have to be applied, and more anchorage will be lost. Statistical analysis of the results of dental-angular measurements showed significant differences in the degree of molar tipping and reciprocal incisor protrusion. The degree of distal tipping of first molars was less in patients with erupted second molars (PG 2 and PG 3) than in those whose second molars were not yet erupted (PG 1). For instance, the

  16. Pericoronaritis: Criterios actuales. Revisión bibliográfica

    OpenAIRE

    Elena Morán López; Yulién Cruz Paulín

    2001-01-01

    Se realizó una revisión bibliográfica sobre pericoronaritis, donde se exponen los criterios más actuales en cuanto al diagnóstico clínico, radiológico y microbiológico de dicha patología. Se ha identificado la pericoronaritis como un proceso infeccioso agudo que está relacionado con los tejidos blandos que rodean la corona de un diente retenido (terceros molares inferiores, que tienen una posición vertical, con inclinación hacia distal y que estén cerca o en el plano de la oclusión, con mayor...

  17. Predicting pathology in impacted mandibular third molars

    Directory of Open Access Journals (Sweden)

    Aveek Mukherji

    2017-01-01

    Full Text Available Introduction: The rising incidence of the impacted mandibular third molars and their association with pathologies is now considered a public health problem. Aims and Objectives: The objective of this study was to assess the position of impacted mandibular third molars that are prone to developing pathologies and to determine the frequency and type of pathological conditions associated with these impacted teeth to facilitate planning for their prophylactic removal. Materials and Methods: Consecutive panoramic radiographs and clinical examination of 300 patients with impacted mandibular third molars were collected. They were segregated according to Pell and Gregory’s classification, Winter’s classification, and according to their state of eruption. These were correlated with associated pathologies based on clinical and radiological criteria. Statistical Analysis Used: Descriptive statistics included computation of percentages, mean, and standard deviations. The statistical test applied for the analysis was Pearson’s Chi-square test (χ2. For this test, confidence interval and P value were set at 93% and ≤0.03, respectively. Results: The pathology most commonly associated with impacted third molars was pericoronitis, which had the highest frequency of occurrence in partially erupted, distoangular, and IA positioned (as per Pell and Gregory classification impacted teeth. Impacted mandibular third molars, which were in IA position, placed mesially, and partially erupted, were prone to develop pathologies such as dental caries and periodontitis. Conclusion: The clinical and radiographical features of impacted third molar may be correlated to the development of their pathological complications. The partially impacted mandibular third molars with mesioangularly aligned in IA position have the highest potential to cause pathological complications.

  18. Ketac Molar Versus Dyract Class II restorations in primary molars: twelve month clinical results.

    Science.gov (United States)

    Marks, L A; van Amerongen, W E; Borgmeijer, P J; Groen, H J; Martens, L C

    2000-01-01

    The aim of the present clinical study was an in vivo evaluation of an improved conventional glass ionomer cement Ketac Molar (ESPE), compared to a polyacid modified composite resin, Dyract (Dentsply/De Trey), used in primary molars. Fifty-three Ketac Molar and fifty-two Dyract restorations were placed in box-only preparations in primary molars. The application time for the chemically cured Ketac Molar, was longer compared to the light-cured Dyract. In comparing the materials, no differences were found, comparing both materials regarding secondary caries, marginal adaptation, wear and fracture toughness. One case of recurrent caries adjacent to a Ketac Molar restoration and two cases in the Dyract group were reported. Two Ketac Molar restorations and one Dyract showed bulk fracture at the time of evaluation. At the twelve-month evaluation, no difference between the investigated materials was registered, which indicates that Ketac Molar can be used as a proximal restoration in the primary dentition. It should be emphasized, however, that one-year data should not be extrapolated to indicate the long-term success of restorations.

  19. Las actividades militares de los buques de guerra de terceros Estados en los espacios marítimos de soberanía o jurisdicción del Estado ribereño

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    Miguel Ángel Franco García

    2014-06-01

    Full Text Available La presencia estatal en la mar, se hace ostensible fundamentalmente a través de los buques de guerra, cuyo particular régimen jurídico, condiciona su modo de ser y estar en dicho medio. Además, hace necesario conciliar el ejercicio de las actividades militares llevadas a efecto por los buques de guerra pertenecientes a terceros Estados, con los derechos que ostentan los Estados ribereños en los espacios marítimos sometidos a su soberanía o jurisdicción. La cuestión relativa a la conformidad o no a Derecho de las actividades militares desarrolladas por los buques de guerra de terceros Estados en las aguas interiores, el mar territorial, y la zona económica exclusiva del Estado ribereño dista mucho de ser pacífica en la doctrina y en la práctica internacional. Los usos militares del mar por terceros Estados, cuando se proyectan sobre las aguas interiores y el mar territorial del Estado ribereño, aparecen limitados por el ejercicio de la soberanía por parte de este último, en dichas aguas. Sin embargo, en la zona económica exclusiva del ribereño, partiendo del silencio que guarda en este punto la Convención de las Naciones Unidas sobre el Derecho del Mar, las actividades militares realizadas por otros Estados, han de considerarse internacionalmente legítimas, de manera que, sólo resultarían ilegítimas si, atendiendo al supuesto concreto planteado, aquéllas contravinieran alguna de sus disposiciones

  20. Comparative evaluation of molar distalization therapy with erupted second molar: Segmented versus Quad Pendulum appliance.

    Science.gov (United States)

    Caprioglio, Alberto; Cozzani, Mauro; Fontana, Mattia

    2014-01-01

    There are controversial opinions about the effect of erupted second molars on distalization of the first molars. Most of the distalizing devices are anchored on the first molars, without including second molars; so, differences between sequentially distalize maxillary molars (second molar followed by the first molar) or distalize second and first molars together are not clear. The aim of the study was to compare sequential versus simultaneous molar distalization therapy with erupted second molar using two different modified Pendulum appliances followed by fixed appliances. The treatment sample consisted of 35 class II malocclusion subjects, divided in two groups: group 1 consisted of 24 patients (13 males and 11 females) with a mean pre-treatment age of 12.9 years, treated with the Segmented Pendulum (SP) and fixed appliances; group 2 consisted of 11 patients (6 males and 5 females) with a mean pre-treatment age of 13.2 years, treated with the Quad Pendulum (QP) and fixed appliances. Lateral cephalograms were obtained before treatment (T1), at the end of distalization (T2), and at the end of orthodontic fixed appliance therapy (T3). A Student t test was used to identify significant between-group differences between T1 to T2, T2 to T3, and T1 to T3. QP and SP were equally effective in distalizing maxillary molars (3.5 and 4 mm, respectively) between T1 and T2; however, the maxillary first molar showed less distal tipping (4.6° vs. 9.6°) and more extrusion (1.1 vs. 0.2 mm) in the QP group than in the SP group, as well as the vertical facial dimension, which increased more in the QP group (1.2°) than in the SP group (0.7°). At T3, the QP group maintained greater increase in lower anterior facial height and molar extrusion and decrease in overbite than the SP group. Quad Pendulum seems to have greater increase in vertical dimension and molar extrusion than the Segmented Pendulum.

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

    Directory of Open Access Journals (Sweden)

    S. Arab

    2011-09-01

    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.

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

    OpenAIRE

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

    2008-01-01

    La fusión dental es la unión de dos gérmenes dentales normalmente separados, mientras que la geminación se define como el intento de división de un único germen dental. La fusión y geminación de molares es poco frecuente en la dentición permanente. Describimos un caso clínico de un tercer molar inferior derecho fusionado a un cuarto molar supernumerario en un paciente varón de 36 años que ha presentado repetidos episodios de pericoronaritis. Tras el estudio radiológico se realiza la exodoncia...

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

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    Samer Abdel Nour Khoury

    2008-12-01

    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.

  4. Molar Tissue in Spleen: A Case Report

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    Maral Mokhtari

    2016-04-01

    Full Text Available An invasive mole is a rare form of gestational trophoblastic disease in which the molar tissue invades into the deep myometrium, cervical stroma, blood vessels or extrauterine sites. This report is of an invasive mole of spleen that has originated from an ectopic pregnancy, which was primarily though to be a choriocarcinoma.

  5. Taurodontism in deciduous Molars - A Case Report.

    Science.gov (United States)

    Bhat, S S; Sargod, S; Mohammed, S V

    2004-01-01

    Taurodontism has a very low incidence in deciduous dentition and very few cases are reported in the literature, it stands a challenge when it requires pulp therapy. This case report presents a case of Taurodontism in deciduous molars of a five year old male child which required pulp therapy. A clinical and radiographic follow up of the patient is discussed.

  6. Molar extinction coefficients of some fatty acids

    DEFF Research Database (Denmark)

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

    2002-01-01

    ) 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...

  7. ERUPTION DISTURBANCES OF PERMANENT MOLARS - A REVIEW

    NARCIS (Netherlands)

    RAGHOEBAR, GM; BOERING, G; VISSINK, A; STEGENGA, B

    Eruption disturbances of permanent molars may become clinically and radiographically manifest as impaction, primary retention or secondary retention. This may result in clinical problems such as malocclusion and loss of neighboring teeth due to caries and periodontal disease. Which of these

  8. Distalización de molares

    Directory of Open Access Journals (Sweden)

    Ana María García Jiménez

    2016-01-01

    Full Text Available La distoclusión es una anomalía que alcanza a más de la mitad de los pacientes ortodóncicos, entre sus causas se encuentra la mesogresión de molares superiores. Una opción terapéutica es la distalización molar, cuando se considera la corrección sin extracciones. Se presenta el caso de un paciente remitido desde la atención primaria de salud, con relación molar de distoclusión derecha, neutroclusion izquierda, resalte de seis milímetros y sobrepase corona completa. Previa confección de modelos de estudio e indicación de estudio radiográfico, se procedió a la corrección ortodóncica con la placa Cetlin, a la que se le realizaron algunas modificaciones. Se corrigió la distoclusión del primer molar permanente superior derecho hasta la neutroclusión; además del espacio requerido para el acomodamiento del canino superior derecho, se logró la corrección del sobrepase hasta un tercio de corona y se mejoró el resalte de seis a cuatro milímetros.

  9. Bodily distalization of molars with absolute anchorage.

    Science.gov (United States)

    Keles, Ahmet; Erverdi, Nejat; Sezen, Serdar

    2003-08-01

    Palatal implants have been used over the last two decades to eliminate headgear wear and to establish stationary anchorage. In this case report, the stability of a palatal implant for distalization of molars bodily and for anchorage maintenance was assessed. The implant was a stepped screw titanium (4.5 mm diameter x 8 mm length), and it was placed in the palatal region for orthodontic purposes. A surgical template containing a metal drill housing was prepared. Angulation of the drill housing was controlled according to the radiologic tracing of the maxilla transferred to a plaster cast section in the paramedian plane. The implant was placed using a noninvasive technique (incision, flap, and suture elimination) and left transmucosally to facilitate the surgical procedure and to reduce the number of operations. The paramedian region was selected (1) to avoid the connective tissues of the palatine suture and (2) because it is considered to be a suitable host site for implant placement. After three months of healing, the implant was osseointegrated and orthodontic treatment was initiated. For molar distalization, the Keles Slider appliance was modified and, instead of a Nance button, a palatal implant was used for anchorage. The results showed that the molars were distalized bodily at five months, and no anchorage loss was observed. At the end of the treatment, the smile was improved, and an ideal Class I molar and canine relationship, an ideal overbite, and an ideal overjet were all achieved. In conclusion, palatal implants can be used effectively for anchorage maintenance and in space-gaining procedures. Use of a three-dimensional surgical template eliminated implant placement errors, reduced chair time, minimized trauma to the tissues, and enhanced osseointegration. This method can be used effectively to achieve distalization of molars bodily without anchorage loss.

  10. Incidence of distal caries in mandibular second molars due to impacted third molars: Nonintervention strategy of asymptomatic third molars causes harm? A retrospective study.

    Science.gov (United States)

    Srivastava, Nikhil; Shetty, Akshay; Goswami, Rahul Dev; Apparaju, Vijay; Bagga, Vivek; Kale, Saurabh

    2017-01-01

    Removal of impacted third molars is the most common oral surgical procedure. Many investigators have questioned the necessity of removal in patients who are free of symptoms or associated pathologies. The aim of this retrospective study was to evaluate the incidence of caries on distal aspect of mandibular second molars in patients referred for corresponding third molar assessment and to identify its association with angular position and depth of the impacted mandibular third molars based on the classification of Pell and Gregory. Records of 150 patients with impacted third molar presenting to the Department of Oral and Maxillofacial Surgery, Sri Rajiv Gandhi College of Dental Sciences and Hospital, were assessed retrospectively. The radiographic angulation and depth of mandibular third molar impaction were determined and compared to determine the relationship with incidence of caries on the distal surface of the second molar. According to this study results, 37.5% cases show caries on the distal aspect of mandibular second molars. The incidence of caries with mesioangular impacted third molars was 55%. A majority of these mesioangular cases were Level B and Class I as per the Pell and Gregory classification. The prophylactic extraction of mandibular third molars is indicated if the angulation is between 30° and 70° and is justified by incidence of distal caries in the second molars.

  11. Study of root canal accessibility in human primary molars.

    Science.gov (United States)

    Aminabadi, Naser A; Farahani, Ramin M Z; Gajan, Esrafil B

    2008-03-01

    The aim of the present study was to provide a general scheme for pulpectomy of primary molars that may be useful for decision-making about negotiation of root canals and selection of appropriate instruments. A total of 160 vital primary molars in 85 patients (40 males, 45 females) aged 4-6 years were selected. After taking primary radiographs, local anesthesia was induced, and the teeth were isolated using a rubber dam. Canal accessibility index (CAI) and tooth accessibility index (TAI) were calculated according to initial file size. Mandibular first molars had either three canals (79.2%) or four canals (20.8%), and all second molars had four canals. Maxillary first molars had three canals and second molars had either three canals (70.9%) or four canals (29.1%). Lower accessibility of the mandibular first molar distobuccal root accounted for the lower accessibility of these teeth in comparison with mandibular second molars. While three-canal maxillary second molars were more accessible due to the lower accessibility of the distobuccal canal of the maxillary first molar, poor accessibility of the distal canal in four-canal second molars was responsible for the difficult accessibility of these teeth. In conclusion, it seems that the accessibility of a single canal in each tooth determines the difficulty of accessibility for any given tooth. Moreover, while primary second molars are more accessible than first molars, all of them are negotiable.

  12. An innovative technique to distalize maxillary molar using microimplant supported rapid molar distalizer

    Directory of Open Access Journals (Sweden)

    Meenu Goel

    2013-01-01

    Full Text Available Introduction: In recent years, enhancements in implants have made their use possible as a mode of absolute anchorage in orthodontic patients. In this paper, the authors have introduced an innovative technique to unilaterally distalize the upper left 1 st molar to obtain an ideal Class I molar relationship from a Class II existing molar relationship with an indigenous designed distalizer. Clinical Innovation: For effective unilateral diatalization of molar, a novel cantilever sliding jig assembly was utilized with coil spring supported by a buccally placed single micro implant. The results showed 3 mm of bodily distalization with 1 mm of intrusion and 2° of distal tipping of upper left 1 st molar in 1.5 months. Discussion: This appliance is relatively easy to insert, well-tolerated, and requires minimal patient cooperation compared to other present techniques of molar distalization. Moreover, it is particularly useful in cases that are Class II on one side and Class I on the other, with a minor midline discrepancy and nominal overjet. Patient acceptance level was reported to be within patients physiological and comfort limits.

  13. Mandibular molar crown-topography, a biological predisposing ...

    African Journals Online (AJOL)

    Mandibular molar crown-topography, a biological predisposing factor to development of caries – a post-mortem analysis of 2500 extracted lower permanent molars at the dental centre, University of Benin teaching hospital.

  14. Study of Kissing Molars in Turkish Population Sample

    African Journals Online (AJOL)

    2017-06-28

    Jun 28, 2017 ... Mandibular third molars are the most common unerupted teeth; retention of the mandibular second molar is much less common.[1] Simultaneous retention of both teeth is quite rare. “Kissing molars” (KMs) are an interesting finding in permanent mandibular molar teeth. KMs or “rosette formation” was first ...

  15. Ruptured tubal molar pregnancy | Yakasai | Nigerian Journal of ...

    African Journals Online (AJOL)

    Molar pregnancies in most instances develop within the uterine cavity, but may occur at any site. Ectopic molar pregnancy is a rare event. The objective of this study was to present a case of ruptured tubal molar gestation, discuss its clinical features and ways to improve diagnostic accuracy. A 35.year.old woman presented ...

  16. Molar tooth sign - looking beyond the obvious | Mahomed | SA ...

    African Journals Online (AJOL)

    The molar tooth sign was initially identified in Joubert syndrome, named after Marie Joubert who first described it in 1968 as a rare autosomal recessive disorder characterised by the neuroradiological hallmark of the molar tooth sign caused by cerebellar vermian hypoplasia. Subsequently, it emerged that the molar tooth ...

  17. Excess molar volumes, and refractive index of binary mixtures of ...

    African Journals Online (AJOL)

    Excess molar volumes (VE) viscosities and refractive index have been evaluated for binary mixtures of glycerol + water, and glycerol + methanol at 298.15 K and 303.15 K. Excess molar volumes (VE) have been calculated from density. The excess molar volume (VE) results were fitted to the Redlich and Kister type ...

  18. Molar-incisor-hypomineralisation: a literature review.

    Science.gov (United States)

    Willmott, N S; Bryan, R A E; Duggal, M S

    2008-12-01

    Molar-Incisor-Hypomineralisation (MIH) is a qualitative defect of 1-4 first permanent molars with or without the maxillary and mandibular permanent incisors. It seems to have been recognised first in the 1970s and prevalence varies between 2.8% and 25%, dependent upon the study. The dental literature was searched using a number of key terms entered into MEDLINE, the reference list of each paper as located was examined for further papers that had been missed in the initial search. The review of the literature showed that teeth that are affected indicate a systemic cause at around the time of birth; investigators have put forward a number of possible causes; asthma, pneumonia, upper respiratory tract infections, otitis media, antibiotics, dioxins in mother's milk, tonsillitis and tonsillectomy and exanthamatous fevers of childhood. However, at the present time the aetiology remains unclear. Treatment of the affected permanent first molars can include restorations using adhesive intra-coronal restorations to extra-coronal restorations (e.g. preformed metal crowns). There is little evidence to support one option over another. In severe cases extraction at the optimum time may be the best option; allowing the permanent second molars to come forwards. There is little improvement in affected anterior teeth with microabrasion and direct or indirect composite resin restorations may be appropriate in some children. Ultrastructural and biochemical make up of MIH affected teeth seem to have been investigated less than other areas. It is important that children with MIH are diagnosed as early as possible and managed appropriately; this will involve multidisciplinary input.

  19. Ceramic onlay for endodontically treated mandibular molar

    OpenAIRE

    Roopadevi Garlapati; Bhuvan Shome Venigalla; Shekhar Kamishetty; Jayaprakash Thumu

    2014-01-01

    Restoration of endodontically treated teeth is important for the success of endodontic treatment. In full coverage restorations, maximum amount of tooth structure is compromised, so as to conserve the amount of tooth structure partial coverage restorations, can be preferred. This case report is on fabrication of a conservative tooth colored restoration for an endodontically treated posterior tooth. A 22-year-old male patient presented with pain in the mandibular left first molar. After endodo...

  20. Pattern of mandibular third molar impaction and its association to caries in mandibular second molar: A clinical variant

    Directory of Open Access Journals (Sweden)

    V K Prajapati

    2017-01-01

    Conclusion: According to this study, pattern of mandibular third molar impaction is in association to caries in mandibular second molar. More future studies are needed. In addition, the results of the present study can be used to screen and inform the patients about the possibility of caries in relation to third molar mandibular impaction.

  1. Influence of unilateral maxillary first molar extraction treatment on second and third molar inclination in Class II subdivision patients

    NARCIS (Netherlands)

    Livas, Christos; Pandis, Nikolaos; Booij, Johan Willem; Halazonetis, Demetrios J.; Katsaros, Christos; Ren, Yijin

    Objective: To assess the maxillary second molar (M2) and third molar (M3) inclination following orthodontic treatment of Class II subdivision malocclusion with unilateral maxillary first molar (M1) extraction. Materials and Methods: Panoramic radiographs of 21 Class II subdivision adolescents (eight

  2. Molar tubal ectopic pregnancy: Report of two cases.

    Science.gov (United States)

    Mbarki, Chaouki; Jerbi, Emna; Hsayaoui, Najeh; Zouari, Fatma; Ben Brahim, Ehsen; Oueslati, Hedhili

    2015-06-01

    Ectopic molar pregnancy is a rare occurrence and consequently not often considered as a diagnostic possibility. We report two cases of molar hydatidiform tubal pregnancy. Diagnosis of ectopic pregnancy was confirmed on clinical biological and sonographic investigations. Diagnosis of molar pregnancy was done on histopathology. The clinical course was favorable for both patients. Although rare, molar changes can occur at any site of an ectopic pregnancy. Clinical diagnosis of a molar pregnancy is difficult but histopathology is the gold standard for diagnosis. © 2014 The Authors. Journal of Obstetrics and Gynaecology Research © 2014 Japan Society of Obstetrics and Gynecology.

  3. One year Survival Rate of Ketac Molar versus Vitro Molar for Occlusoproximal ART Restorations: a RCT.

    Science.gov (United States)

    Anna Luisa de Brito, Pacheco; Isabel Cristina, Olegário; Clarissa Calil, Bonifácio; Ana Flávia Bissoto, Calvo; José Carlos Pettorossi, Imparato; Daniela Prócida, Raggio

    2017-11-06

    Good survival rates for single-surface Atraumatic Restorative Treatment (ART) restorations have been reported, while multi-surface ART restorations have not shown similar results. The aim of this study was to evaluate the survival rate of occluso-proximal ART restorations using two different filling materials: Ketac Molar EasyMix (3M ESPE) and Vitro Molar (DFL). A total of 117 primary molars with occluso-proximal caries lesions were selected in 4 to 8 years old children in Barueri city, Brazil. Only one tooth was selected per child. The subjetcs were randomly allocated in two groups according to the filling material. All treatments were performed following the ART premises and all restorations were evaluated after 2, 6 and 12 months. Restoration survival was evaluated using Kaplan-Meier survival analysis and Log-rank test, while Cox regression analysis was used for testing association with clinical factors (α = 5%). There was no difference in survival rate between the materials tested, (HR = 1.60, CI = 0.98-2.62, p = 0.058). The overall survival rate of restorations was 42.74% and the survival rate per group was Ketac Molar = 50,8% and Vitro Molar G2 = 34.5%). Cox regression test showed no association between the analyzed clinical variables and the success of the restorations. After 12 months evaluation, no difference in the survival rate of ART occluso-proximal restorations was found between tested materials.

  4. One year Survival Rate of Ketac Molar versus Vitro Molar for Occlusoproximal ART Restorations: a RCT

    Directory of Open Access Journals (Sweden)

    PACHECO Anna Luisa de Brito

    2017-11-01

    Full Text Available Abstract Good survival rates for single-surface Atraumatic Restorative Treatment (ART restorations have been reported, while multi-surface ART restorations have not shown similar results. The aim of this study was to evaluate the survival rate of occluso-proximal ART restorations using two different filling materials: Ketac Molar EasyMix (3M ESPE and Vitro Molar (DFL. A total of 117 primary molars with occluso-proximal caries lesions were selected in 4 to 8 years old children in Barueri city, Brazil. Only one tooth was selected per child. The subjetcs were randomly allocated in two groups according to the filling material. All treatments were performed following the ART premises and all restorations were evaluated after 2, 6 and 12 months. Restoration survival was evaluated using Kaplan-Meier survival analysis and Log-rank test, while Cox regression analysis was used for testing association with clinical factors (α = 5%. There was no difference in survival rate between the materials tested, (HR = 1.60, CI = 0.98–2.62, p = 0.058. The overall survival rate of restorations was 42.74% and the survival rate per group was Ketac Molar = 50,8% and Vitro Molar G2 = 34.5%. Cox regression test showed no association between the analyzed clinical variables and the success of the restorations. After 12 months evaluation, no difference in the survival rate of ART occluso-proximal restorations was found between tested materials.

  5. Radiologic study of mandibular third molar of Korean youths

    Energy Technology Data Exchange (ETDEWEB)

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

    1982-11-15

    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%.

  6. UNILATERAL DISTALIZATION OF MAXILLARY MOLAR BY PENDULUM APPLIANCE

    Directory of Open Access Journals (Sweden)

    Safra Mauna

    2006-04-01

    Full Text Available Pendulum appliance is one of intraoral appliances to distalize molars for correction of class II molar relationship or space gaining in the maxillary arch. Its major advantages are: no need to depend on patient compliance; ease of fabrication; and better patient acceptance. In this case, 22 years old female patient with class II division 2 malocclusion was treated with pendulum appliance for unilateral distalization of the maxillary molar teeth. Pendulum can distalize second molar until 4 mm in 4 months and continues to distalize first molar in 3 months. Nevertheless, relapse 2 mm happens during anterior retraction. This case has shown that pendulum is an effective and reliable appliance for distalizing maxillary molars. However, molar distalization is at the expense of moderate anchorage loss during anterior retraction, which could possibly be reduced if the anchor unit is adequately reinforced.

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

    Directory of Open Access Journals (Sweden)

    Shinohara Elio

    2010-01-01

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

  8. Bilateral lower second molar impaction in teenagers: an emergent problem?

    Science.gov (United States)

    Shinohara, Elio H; Kaba, Shajadi Carlos Pardo; Pedron, Irineu Gregnanin; Imparato, Jose Carlos Petorossi

    2010-01-01

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

  9. MANAGEMENT OF MANDIBULAR THIRD MOLAR SURGERY TO PRESERVE PERIODONTAL HEALTH OF SECOND MOLAR

    Directory of Open Access Journals (Sweden)

    Elitsa G. Deliverska

    2017-06-01

    Full Text Available Background: Extraction of impacted third molar violates surrounding soft and bony tissues. Various surgical approaches and surgical technics have an important impact on the periodontal health of the adjacent second molar. Purpose: The aim of this review is to analyse the causes that can affect postoperative periodontal outcomes for the mandibular second molars (LM2 adjacent to the impacted/ semi impacted mandibular third molars (LM3. Material and Methods: Electronic searches were conducted through the MEDLINE (PubMed, Scopus, etc. databases to screen all relevant articles published from inception to April 2017. Results: Different flap techniques had no significant impact on the probing depth reduction or on the clinical attachment level of LM2. Szmyd and paramarginal flap designs may be the most effective in reducing the probing depth after third molar surgery, and the envelope flap may be the least effective. Use of bone substitutes and guided tissue regeneration therapy has been proposed, to eliminate or prevent these periodontal defects, but there is still no consensus on their predictability or clinical benefit. Higher costs and the risk of postoperative inflammatory complications should also be taken into proper account, as with any surgical procedure. “Orthodontic extraction” is indicated for that impacted M3 that present a high risk of postoperative periodontal defects at the distal aspect of adjacent M2. Conclusion: Risk factors associated with bone loss following lower third molar extraction includes age, the direction of the eruption, preoperative bone defects, and resorbtion of the LM2 root surface. Prevention of such periodontal defects continues to challenge clinicians.

  10. Stepwise excavation in a permanent molar

    DEFF Research Database (Denmark)

    Lima, Fernanda Ferruzzi; Pascotto, Renata Corrêa; Benetti, Ana Raquel

    2010-01-01

    The current study presents a 17-year clinical report of stepwise excavation and indirect pulp capping in a lower right first molar, with great dentin destruction and a lack of dentin support of the cusps. At the first appointment, indirect pulp capping with calcium hydroxide and a temporary filling...... with zinc oxide cement were performed to minimize the risk of pulp exposure during excavation. After 45 days, the remaining carious tissue was removed and a restoration with glass-ionomer lining (Vitrebond) and resin composite (P-50) was performed. Satisfactory morphology and function of the restoration...

  11. Molar Pregnancy Presents as Tubal Ectopic Pregnancy

    Directory of Open Access Journals (Sweden)

    Fatemeh Davari Tanha

    2011-01-01

    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.

  12. Restorative management of severely ankylosed primary molars.

    Science.gov (United States)

    de Moura, Marcoeli Silva; Pontes, Alessandra Silva; Brito, Maria Hellen Sâmia Fortes; de Deus Moura, Lucia; de Deus Moura de Lima, Marina; de Melo Simplício, Alexandre Henrique

    2015-01-01

    Severe dentoalveolar ankylosis is an etiological factor for malocclusion. When infraocclusion occurs early, it progresses with time, leading to severe consequences in young children because of compensatory supra-eruption of the antagonist tooth and mesialization of adjacent teeth. Early diagnosis allows for interception of the problem and may prevent orthodontic treatment. The purpose of this manuscript is to report two cases of infraocclusion of primary mandibular second molars that were diagnosed early and were treated with composite resin crowns. The use of indirect composite restorations for ankylosed teeth is a good option for primary teeth with a moderate/ severe degree of ankylosis.

  13. Root growth during molar eruption in extant great apes.

    Science.gov (United States)

    Kelley, Jay; Dean, Christopher; Ross, Sasha

    2009-01-01

    While there is gradually accumulating knowledge about molar crown formation and the timing of molar eruption in extant great apes, very little is known about root formation during the eruption process. We measured mandibular first and second molar root lengths in extant great ape osteological specimens that died while either the first or second molars were in the process of erupting. For most specimens, teeth were removed so that root lengths could be measured directly. When this was not possible, roots were measured radiographically. We were particularly interested in the variation in the lengths of first molar roots near the point of gingival emergence, so specimens were divided into early, middle and late phases of eruption based on the number of cusps that showed protein staining, with one or two cusps stained equated with immediate post-gingival emergence. For first molars at this stage, Gorilla has the longest roots, followed by Pongo and Pan. Variation in first molar mesial root lengths at this stage in Gorilla and Pan, which comprise the largest samples, is relatively low and represents no more than a few months of growth in both taxa. Knowledge of root length at first molar emergence permits an assessment of the contribution of root growth toward differences between great apes and humans in the age at first molar emergence. Root growth makes up a greater percentage of the time between birth and first molar emergence in humans than it does in any of the great apes. Copyright (c) 2009 S. Karger AG, Basel.

  14. Taking advantage of an unerupted third molar: a case report.

    Science.gov (United States)

    Pereira, Igor Figueiredo; Santiago, Fernando Zander Mucci; Sette-Dias, Augusto Cesar; Noronha, Vladimir Reimar Augusto de Souza

    2017-01-01

    Treatments with dental surgery seek to displace tooth to the correct position within the dental arch. To report a clinical case that took advantage of an unerupted third molar. A male patient, 18 years of age, was referred by his dentist to evaluate the third molars. The clinical exam revealed no visible lower third molars. The computed tomography (CT) exam showed the presence of a supernumerary tooth in the region of the mandibular ramus, on the left side, and impaction of the third molar, which was causing root resorption on the second molar, thus making it impossible to remain in the buccal cavity. The preferred option, therefore, was to remove both second molar and the supernumerary tooth, in addition to attaching a device to the third molar during surgery for further traction. After 12 months, the third molar reached the proper position. When a mandibular second permanent molar shows an atypical root resorption, an impacted third molar can effectively substitute the tooth by using an appropriate orthodontic-surgical approach.

  15. Molar Incisor Hypomineralization, Prevalence, and Etiology

    Directory of Open Access Journals (Sweden)

    Sulaiman Mohammed Allazzam

    2014-01-01

    Full Text Available 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.

  16. Sealing Occlusal Dentin Caries in Permanent Molars

    DEFF Research Database (Denmark)

    Qvist, Vibeke; Borum, Mette Kit; Møller, Kirsten Dynes

    2017-01-01

    The purpose of this study was to investigate the possibility of postponing restorative intervention of manifest occlusal caries in young, permanent dentition by non-invasive sealing. This RCT-designed study included 521 occlusal lesions in 521 patients aged 6 to 17 y. Based on clinical and radiog......The purpose of this study was to investigate the possibility of postponing restorative intervention of manifest occlusal caries in young, permanent dentition by non-invasive sealing. This RCT-designed study included 521 occlusal lesions in 521 patients aged 6 to 17 y. Based on clinical...... longevity of sealings and restorations until retreatments, and 3) compare effectiveness of sealings and restorations to halt caries progression in sealed lesions and beneath restorations. Furthermore, we aimed to identify factors influencing longevity and the effectiveness of sealings and restorations.......001). The median survival time for sealings not replaced by restorations was 7.3 y (CI, 6.4 y to NA). Survival of sealings was increased in patients with low caries risk and/or excellent oral hygiene, second molars compared with first molars, and lesions not extending the middle one-third of the dentin. Survival...

  17. Periodontal changes following molar intrusion with miniscrews.

    Science.gov (United States)

    Bayani, Shahin; Heravi, Farzin; Radvar, Mehrdad; Anbiaee, Najmeh; Madani, Azam Sadat

    2015-01-01

    With the introduction of skeletal anchorage system, recently it is possible to successfully intrude molar teeth. On the other hand, there have been concerns about periodontal changes associated with intrusion and there are few studies on this topic, especially for posterior teeth. Ten female patients were enrolled in this study. Maxillary molar intrusion was achieved by inserting two miniscrews and a 17 × 25 titanium molybdenum alloy spring. Crestal height changes were evaluated at three intervals including: Baseline (T0), end of active treatment (T1) and 6 months after retention (T2). Other variables including probing depth, gingival recession, attachment level and bleeding on probing were evaluated by clinical measurements in the three above mentioned intervals. One-sample Kolmogrov-Smirnov test ascertained the normality of the data. For all patients, the changes in tooth position and crestal height were evaluated using one-sample t-test. (P intrusion, but also there were signs of periodontal improvement including attachment gain and shortening of clinical crown height.

  18. Extrações de molares na Ortodontia Molar extractions in orthodontics

    Directory of Open Access Journals (Sweden)

    Marco Antônio Schroeder

    2011-12-01

    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.

  19. Pattern of mandibular third molar impaction and its association to caries in mandibular second molar: A clinical variant.

    Science.gov (United States)

    Prajapati, V K; Mitra, Ruchi; Vinayak, K M

    2017-01-01

    Caries in second molar is common and prophylactic removal of the impacted teeth may be considered appropriate. Caries detection and restoration can be difficult and a restored second molar can undergo recurrent caries if the third molar is not removed prophylactically. In this study, the clinical findings related to impaction and its association with angular position and depth of impacted third molar were evaluated. A retrospective descriptive study was carried out among the patients visiting the outpatient, department of Dentistry, RIMS, Ranchi. The clinical examination, periapical radiographs and Pre-op OPG were taken. Teeth positions were analyzed by Pell and Gregory and Winter classification. The angulation and depth of mandibular third molar impaction and caries in the second molar with the eruption status of the mandibular third molar was determined. A total of 200 patients were included in the study between age group 17-45 years. Majority of the Patients reported to the hospital with complaints of decayed tooth (66%) and pain (59%). The most common third molar impaction was mesioangular followed by distoangular. A statistically highly significant difference (P = 0.001) was obtained with the presence of caries in second molar adjacent to mesioangular third molar in class I and level B. According to this study, pattern of mandibular third molar impaction is in association to caries in mandibular second molar. More future studies are needed. In addition, the results of the present study can be used to screen and inform the patients about the possibility of caries in relation to third molar mandibular impaction.

  20. Survival of sealants in molars affected by molar-incisor hypomineralization: 18-month follow-up.

    Science.gov (United States)

    Fragelli, Camila Maria Bullio; Souza, Juliana Feltrin de; Bussaneli, Diego Girotto; Jeremias, Fabiano; Santos-Pinto, Lourdes Dos; Cordeiro, Rita de Cássia Loiola

    2017-04-27

    The objective of this study was to evaluate the clinical survival of sealants applied in first permanent molars (FPMs) affected by molar-incisor hypomineralization (MIH), at 18 months of follow-up. Forty-one first permanent molars were selected from 21 children, 6-8 years of age. MIH was classified by one calibrated examiner (kappa = 0.80) according to EAPD criteria. The inclusion criteria were fully erupted FPMs with MIH or sound FPMs (without MIH) for which sealant treatment was indicated. The FPMs were assigned to two groups: CG (control group) and HG (MIH group). Both groups were treated with sealant (FluroShield). Clinical follow-up was performed from baseline to 18 months to assess anatomical form, marginal adaptation, retention and presence of caries, according to criteria set by the United States Public Health Service-Modified, and was conducted by a blinded examiner (kappa = 0.80). The actuarial method was used to evaluate the survival of the sealants. The survival rates for the groups were compared using Fisher's exact test (α = 5%). The cumulative survival rates were 81% at 1 month, 68.8% at 6 months, 68.8% at 12 months, and 62.6% at 18 months for CG, and 88% at 1 month, 84% at 6 months, 76% at 12 months, and 72% at 18 months for HG. No significant difference was found between the groups. The sealants in molars affected by MIH presented a survival rate similar to the sealants in the control, suggesting that sealants may be an adequate approach for preventing carious lesions in MIH-affected molars.

  1. Survival of sealants in molars affected by molar-incisor hypomineralization: 18-month follow-up

    Directory of Open Access Journals (Sweden)

    Camila Maria Bullio FRAGELLI

    2017-04-01

    Full Text Available Abstract The objective of this study was to evaluate the clinical survival of sealants applied in first permanent molars (FPMs affected by molar-incisor hypomineralization (MIH, at 18 months of follow-up. Forty-one first permanent molars were selected from 21 children, 6–8 years of age. MIH was classified by one calibrated examiner (kappa = 0.80 according to EAPD criteria. The inclusion criteria were fully erupted FPMs with MIH or sound FPMs (without MIH for which sealant treatment was indicated. The FPMs were assigned to two groups: CG (control group and HG (MIH group. Both groups were treated with sealant (FluroShield. Clinical follow-up was performed from baseline to 18 months to assess anatomical form, marginal adaptation, retention and presence of caries, according to criteria set by the United States Public Health Service-Modified, and was conducted by a blinded examiner (kappa = 0.80. The actuarial method was used to evaluate the survival of the sealants. The survival rates for the groups were compared using Fisher’s exact test (α = 5%. The cumulative survival rates were 81% at 1 month, 68.8% at 6 months, 68.8% at 12 months, and 62.6% at 18 months for CG, and 88% at 1 month, 84% at 6 months, 76% at 12 months, and 72% at 18 months for HG. No significant difference was found between the groups. The sealants in molars affected by MIH presented a survival rate similar to the sealants in the control, suggesting that sealants may be an adequate approach for preventing carious lesions in MIH-affected molars.

  2. Autotransplantation of Mandibular Third Molar: A Case Report

    Directory of Open Access Journals (Sweden)

    Pabbati Ravi kumar

    2012-01-01

    Full Text Available Autogenous transplantation is a feasible, fast, and economical option for the treatment of nonsalvageable teeth when a suitable donor tooth is available. This paper presents successful autotransplantation of a mature mandibular left third molar (38 without anatomical variances is used to replace a mandibular left second molar (37. The mandibular second molar was nonrestorable due to extensive root caries and resorption of distal root. After extraction of mandibular second and third molars, root canal therapy was done for the third molar extraorally, and the tooth was reimplanted into the extracted socket of second molar site. After one year, clinical and radiographic examination revealed satisfactory outcome with no signs or symptoms suggestive of pathology. In selected cases, autogenous tooth transplantation, even after complete root formation of the donor tooth, may be considered as a practical treatment alternative to conventional prosthetic rehabilitation or implant treatment.

  3. Prevalence of eruption status of third molars in Libyan students

    Directory of Open Access Journals (Sweden)

    Sujata Byahatti

    2012-01-01

    Full Text Available Background: The aim of the present study is to determine the number of third molars per person, angulation, level, amount of space for eruption of third molar between ramus of mandible and second molar and the eruption status of third molar in a group of Libyan students, with different impaction patterns and agenesis of third molars. Materials and Methods: In this descriptive retrospective study, a total of 200 students (100 male and 100 female students of bachelor of dental surgery, Faculty of Dentistry, Garyounis University, Benghazi, Libya were enrolled. Students who had complete complement of teeth within the age group 17-26 years were selected for this study, while those cases who had history of extraction of any of the teeth or who refused to give consent were excluded. Before starting the study, ethical concern from the ethical committee, IRB and informed consent from each student who underwent radiography were obtained. Results: The results showed that 5% of third molars were congenitally missing. Approximately 93.5% of the subjects had all four third molars, 1% had two third molars and 0.5% had one third molars with 2.5% having agenesis of all third molars. Third molar agenesis showed predilection for maxilla with higher proportion in females (3% than males (2.1%. Angular position was maximum with vertical position (5.83%, with least being horizontal impactions. Level of occlusal plane of third molar similar to that of adjacent tooth was seen in 44.74%, below the occlusal plane in 24.76%, totally impacted noted in 30%. Conclusion: The present study showed that 33% of the teeth were fully erupted and 66% were in various stages of eruption and 5% were congenitally missing in these students.

  4. Unusal canal configuration in maxillary and mandibular second molars

    Directory of Open Access Journals (Sweden)

    Ramachandran Ragunathan

    2016-01-01

    Full Text Available This clinical article describes three different case reports of maxillary and mandibular second molars with the unusual anatomy of single root with a single canal and their endodontic management. An unusual case of bilateralism is observed in the first two cases in the form of single-rooted second mandibular molars in both the quadrant of the same patient. The presence of maxillary second molar with single root and single canal in the third case is unusual.

  5. Bilateral lower second molar impaction in teenagers: An emergent problem

    OpenAIRE

    Shinohara Elio; Kaba Shajadi; Pedron Irineu; Imparato Jose

    2010-01-01

    The frequency of simultaneously impacted second and third molars in teenagers is increasing and becoming a common occurrence in adolescent oral surgery practice. The traditional treatment is the removal of the third molar by conventional access but repositioning of the surgical flap to the distal face of the first molar can predispose to complications such as pericoronitis and delayed healing of the attached gingiva. We present a case in which we use the germectomy approach to remove the impa...

  6. Intraoperative accidents associated with surgical removal of third molars

    OpenAIRE

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

    2014-01-01

    Aim: To evaluate the prevalence of intraoperative accidents associated with extraction of third molars and identify possible risk factors. Methods: Prospective study with patients undergoing third molar surgery by residents of the Oral and Maxillofacial Surgery Service at the Federal University of Parana. Epidemiological data were collected from preoperative evaluation forms. During the surgical procedure were evaluated the radiographic position classifications of all third molars removed, us...

  7. Second molar impaction associated with lip bumper therapy.

    Science.gov (United States)

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

    2014-01-01

    Although lip bumpers (LBs) provide significant clinical gain of mandibular arch perimeter in mixed-dentition patients, orthodontists are reluctant to use them due to the possibility of permanent second molar eruptive disturbances. The present study was conducted to assess second molar impaction associated with the use of LBs, and to investigate how they can be solved. Lateral and panoramic radiographs of 67 patients (34 females and 33 males) were assessed prior (T₁) and post-LB treatment (T₂). LB therapy lasted for approximately 1.8 ± 0.9 years. Concomitant rapid palatal expansion (RPE) was performed in the maxilla at LB treatment onset. Impaction of mandibular second molars was assessed by means of panoramic radiographs in relation to the position of first mandibular molars. Horizontal and vertical movements of first and second molars were assessed cephalometrically on lateral cephalometric radiographs based on mandibular superimpositions. Eight (11.9%) patients had impacted second molars at the end of LB therapy. Two patients required surgical correction, whereas five required spacers and one patient was self-corrected. Mandibular first molar tip and apex migrated forward 1.3 mm and 2.3 mm, respectively. Second molar tip showed no statistically significant horizontal movement. Although LB therapy increased the risk of second molar impaction, impactions were, in most instances, easily solved.

  8. Second molar impaction associated with lip bumper therapy

    Directory of Open Access Journals (Sweden)

    Helder Baldi Jacob

    2014-12-01

    Full Text Available INTRODUCTION: Although lip bumpers (LBs provide significant clinical gain of mandibular arch perimeter in mixed-dentition patients, orthodontists are reluctant to use them due to the possibility of permanent second molar eruptive disturbances.OBJECTIVE: The present study was conducted to assess second molar impaction associated with the use of LBs, and to investigate how they can be solved.MATERIAL AND METHODS: Lateral and panoramic radiographs of 67 patients (34 females and 33 males were assessed prior (T1 and post-LB treatment (T2. LB therapy lasted for approximately 1.8 ± 0.9 years. Concomitant rapid palatal expansion (RPE was performed in the maxilla at LB treatment onset. Impaction of mandibular second molars was assessed by means of panoramic radiographs in relation to the position of first mandibular molars. Horizontal and vertical movements of first and second molars were assessed cephalometrically on lateral cephalometric radiographs based on mandibular superimpositions.RESULTS: Eight (11.9% patients had impacted second molars at the end of LB therapy. Two patients required surgical correction, whereas five required spacers and one patient was self-corrected. Mandibular first molar tip and apex migrated forward 1.3 mm and 2.3 mm, respectively. Second molar tip showed no statistically significant horizontal movement.CONCLUSION: Although LB therapy increased the risk of second molar impaction, impactions were, in most instances, easily solved.

  9. Epidemiological Status of Third Molars in an Iranian Population

    Directory of Open Access Journals (Sweden)

    Mahnaz Sheikhi

    2016-07-01

    Full Text Available Background Impaction of third molars is a common phenomenon. The incidence of impacted third molars varies in different populations. Objectives The aim of this study is to assess radiographic status (root development degree, angulation, and eruption level of the third molar in Iranian population via panoramic radiographs. Patients and Methods 647 patients, ranging in age from 17 - 25, were selected from three regions of Iran. Based on their panoramic radiographs, their root development degree, angulation, and eruption levels were analyzed. Results The angulation of upper third molars were vertical (44.6%, distoangular (44.1%, mesioangular (10.7%, and horizontal (0.6%. For lower third molars, the angulation was mesioangular (44.5%, vertical (33.8%, distoangular (12.2%, and horizontal (9.5%. The eruption levels of maxillary third molars were C > A> B, and for mandibular third molars they were A > B> C. The order of root development prevalence of the maxillary and mandibular third molars was complete > 2/3 > 1/3. Conclusions The most common status of impaction of the third molars in the maxilla was vertical angulation, level C of eruption, and complete root formation. In the mandible it was mesioangular, level A of eruption, and complete root formation. Since the study sample consists of patients from the north, middle, and south of Iran, the sample can represent the whole population of Iran.

  10. Periodontal Healing Distally to Second Mandibular Molar After Third Molar Coronectomy.

    Science.gov (United States)

    Vignudelli, Elisabetta; Monaco, Giuseppe; Gatto, Maria Rosaria Antonella; Franco, Simonetta; Marchetti, Claudio; Corinaldesi, Giuseppe

    2017-01-01

    Coronectomy of mandibular third molars is a procedure that still raises a number of questions. The aim of the present study was to answer one unsolved question: the periodontal healing distal to the mandibular second molar after third molar coronectomy. A prospective cohort study was performed of 30 patients treated at the Unit of Oral and Maxillofacial Surgery of the Department of Biomedical and Neuromotor Science of the University of Bologna. The predictor variables were the probing pocket depth (PPD), the distance between the marginal crest (MC) and the bottom of the osseous defect (BOD), and the distance between the cementum enamel junction (CEJ) and the BOD. These clinical indexes were recorded on 3 points of the distal surface of second molar: the distobuccal (DB), distomedial (DM), and distolingual (DL) sites. The other variables evaluated included root migration and postoperative complications. The Wilcoxon test for paired data and Kendall's tau-b correlation coefficient was used to evaluate all variables. The significance level was set at P = .05. The cohort was composed of 30 patients with 34 high-risk mandibular third molars (9 men and 21 women), with a mean age of 28 ± 7 years. At 9 months, a statistically significant reduction in the PPD of 2 ± 3, 1 ± 2, and 2 ± 2 mm and a statistically significant reduction in the MC-BOD distance of 4 ± 4, 4 ± 4, and 4 ± 5 mm for the DB, DM, and DL sites, respectively, was observed (P = .001). Also, the intraoperative CEJ-BOD distance showed a statistically significant reduction for the DB, DM, and DL sites. After coronectomy, restoration of a clinical healthy periodontium distal to the second molar was observed. However, further studies are necessary to confirm these preliminary clinical results and to compare periodontal healing between coronectomy and complete extraction. Copyright © 2016 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

  11. Second molar periodontal inflammatory disease after third molar removal in young adults.

    Science.gov (United States)

    Dicus, Carolyn; Blakey, George H; Faulk-Eggleston, Jan; Hoverstad, Eric; Offenbacher, Steven; Phillips, Ceib; White, Raymond P

    2010-12-01

    To assess the prevalence of periodontal inflammatory disease on the distal side of second molars after third molar removal and the association between presurgical and surgical variables and postsurgical periodontal outcomes. Data before and after surgery from 2 studies approved by an institutional review board were used. In 1 study, 26 subjects had 4 asymptomatic third molars and in the other 49 subjects had at least 1 mandibular third molar with symptoms of pericoronitis. Full-mouth periodontal probing data, 6 sites per tooth, were obtained as a measurement of periodontal status before and after surgery. A probing depth (PD) ≥4 mm on either of the 2 possible probing sites on the distal side of any second molar (D2M) served as an indicator of periodontal inflammatory disease; periodontal health was defined as all D2M PD <4 mm. Cochran-Mantel-Haenszel row mean score tests compared the subjects' postsurgical periodontal status (all D2M PD <4 mm and at least 1 D2M PD ≥4 mm) with respect to age and time intervals, and the Fisher exact test was used to compare ethnicity, gender, and clinical data at surgery. The McNemar test was used to assess the discordance between subjects' pre- and postsurgical periodontal status. The level of significance was set at .05. Of the 75 subjects, 52% were women and 65% were white. The median age at surgery was 23.6 years (interquartile range, 20.9 to 26.6 years). At enrollment, 53 of 75 subjects (71%) had at least 1 D2M PD ≥4 mm. Subjects were significantly more likely to have an improved D2M periodontal status after surgery than a deteriorated status (P < .01). Fewer subjects, 17 of 75 (24%), had at least 1 D2M PD ≥4 mm after surgery. D2M PD ≥4 mm was more likely after surgery if presurgical D2M was PD ≥4 mm (P < .01). Gender, ethnicity, age, presurgical symptoms, and data estimating the extensiveness of surgery were not significantly associated with postsurgical D2M periodontal outcomes. After third molar removal

  12. Adjacent dentigerous cysts with the ectopic displacement of a third mandibular molar and supernumerary (forth) molar: a rare occurrence.

    Science.gov (United States)

    McCrea, Shane

    2009-06-01

    Dentigerous cysts are the most common odontological cysts of the jaws, being associated with the crowns of permanent teeth, especially unerupted mandibular third molars. Multiple dentigerous cysts are rare and most often occur in association with a developmental syndrome. This article presents an unusual case of nonsyndromic adjacent dentigerous cysts associated with a mandibular third molar and a supernumerary molar. This occurrence has not been previously reported.

  13. Ceramic onlay for endodontically treated mandibular molar

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    Roopadevi Garlapati

    2014-01-01

    Full Text Available Restoration of endodontically treated teeth is important for the success of endodontic treatment. In full coverage restorations, maximum amount of tooth structure is compromised, so as to conserve the amount of tooth structure partial coverage restorations, can be preferred. This case report is on fabrication of a conservative tooth colored restoration for an endodontically treated posterior tooth. A 22-year-old male patient presented with pain in the mandibular left first molar. After endodontic treatment, composite material was used as postendodontic restoration. The tooth was then prepared to receive a ceramic onlay and bonded with self-adhesive universal resin cement. Ceramic onlay restoration was periodically examined up to 2 years.

  14. Presence of third molars in orthodontic patients from northern Greece

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    Barka G

    2012-05-01

    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 Χ2 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

  15. Shear bond strength evaluation of bonded molar tubes on fluorotic molars.

    Science.gov (United States)

    Silva-Benítez, Erika L; Zavala-Alonso, Veronica; Martinez-Castanon, Gabriel A; Loyola-Rodriguez, Juan P; Patiño-Marin, Nuria; Ortega-Pedrajo, Irene; García-Godoy, Franklin

    2013-01-01

    To study the shear bond strength (SBS), sites of failure, and micromorphology of bonded molar tubes used on teeth affected by dental fluorosis. This in vitro study included 140 first molars classified according to Dean's index for dental fluorosis. Samples were divided into seven groups: (1) healthy teeth etched for 15 seconds, (2) teeth with moderate fluorosis (MOF) etched for 15 seconds, (3) teeth with MOF etched for 150 seconds, (4) teeth with MOF microabrasion etched for 15 seconds, (5) teeth with severe fluorosis (SEF) etched for 15 seconds, (6) teeth with SEF etched for 150 seconds, and (7) teeth with SEF microabrasion etched for 15 seconds. All samples were incubated and were then submitted to the SBS test and evaluated with the modified adhesive remnant index (ARI) and analyzed by using a scanning electronic microscope. The SBS mean value for healthy enamel was 20 ± 10.2 MPa. For the group with MOF, the etched 150-second mean value was the highest (19 ± 7.6 MPa); for the group with SEF treated with microabrasion and etched for 15 seconds, the mean value was (13 ± 4.1 MPa). Significant differences (P ≤ .05) were found in the ARI between healthy and fluorosed groups. Fluorotic enamel affects the adhesion of bonded molar tubes. The use of overetching in cases of MOF and the combination of microabrasion and etching in SEF provides a suitable adhesion for fixed appliance therapy.

  16. Histomorphometric evaluation of maxillary molar roots and surrounding periodontium following molar intrusion in rats.

    Science.gov (United States)

    Choi, Y J; Kim, K H; Lee, K J; Chung, C J; Park, Y C

    2015-02-01

    To investigate periodontal tissue changes during and after molar intrusion in rats. The Department of Orthodontics at Yonsei University. Thirty 12-week-old male rats were assigned to 1 control and 5 experimental groups (n = 5 each). In the experimental groups, two maxillary molars were intruded for 2 weeks; the control group underwent the same procedures without the intrusion force. After 2 weeks of intrusion, rats in one of the experimental groups and in the control group were killed. In the other four experimental groups, the new molar positions were either retained or not retained with an occlusal bite block for 1 or 2 weeks prior to euthanization. Histomorphometric analysis was performed for sulcus depth, osteoclast number per unit alveolar bone length, and root resorption area per unit root surface length. Sulcus depth increased during intrusion (P intrusion (P intrusion, irrespective of the retention regimen, relative to that of the control group (P intrusion and that the surrounding periodontium remodeled accordingly as tooth positions were altered, regardless of retention regime. © 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  17. An audit of impacted mandibular third molar surgery | Obimakinde ...

    African Journals Online (AJOL)

    Methodology: We carried out a descriptive clinical study involving patients who presented for management of impacted third molar between January 2010 and December 2011. Demography of the patients including third molar spatial relationship, indications for surgery and pre- and post-operative visual analogue score for ...

  18. Internal root morphology in maxillary first permanent molars in a ...

    African Journals Online (AJOL)

    Objective: To determine the internal root morphology and gender variations in maxillary first permanent molars in a Kenyan population. Design: In vitro descriptive cross-sectional study. Setting: School of Dental Sciences, University of Nairobi. Subject: One hundred and eighty seven maxillary first permanent molars were ...

  19. Incomplete molar pregnancy with live coexisting fetus: a case report

    Directory of Open Access Journals (Sweden)

    Leila Pourali

    2014-03-01

    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.

  20. Case report - Ectopic molar pregnancy: A case report | Bousfiha ...

    African Journals Online (AJOL)

    The incidence of hydatidiform moles is 1 per 1,000 pregnancies. Ectopic pregnancy occurs in 20 per 1,000 pregnancies. Thus, the incidence of the ectopic molar gestation is very rare. We report a case of tubal molar pregnancy diagnosed at the systematic histology exam of an ectopic pregnancy. We report the case of 32 ...

  1. Evaluation of radiographic features of embedded primary molar ...

    African Journals Online (AJOL)

    Background: The roots of primary molars were found in the permanent dentition without symptoms on the clinical or radiographic examination. However, their incidence could not be achieved on the current literature. Objective: The aim of this study is to evaluate the radiographic features of the embedded primary molar roots ...

  2. Impacted Mandibular Third Molars: Review of Literature and a ...

    African Journals Online (AJOL)

    impacted mandibular third molar surgery: 1‑year results. Int. J Periodontics Restorative Dent 1993;13:397. 43. Edwards MJ, Brickley MR, Goodey RD, Shepherd JP. The cost, effectiveness and cost effectiveness of removal and retention of asymptomatic, disease free third molars. Br Dent. J 1999;187:380‑4. 44. Smith WP.

  3. excess molar volumes, and refractive index of binary mixtures of ...

    African Journals Online (AJOL)

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    mixtures of glycerol + water, and glycerol + methanol at 298.15 K and 303.15 K. Excess molar volumes (VE) have been calculated ... KEY WORDS: Excess molar, Density, Refractive index, Glycerol, Water, Methanol ... Biodiesel, defined as “a substitute for, or a additive to diesel fuel that is derived from the oils and fats of ...

  4. [Supernumerary teeth located in molar region: three cases report].

    Science.gov (United States)

    Dai, Jie; Yang, Weijiang; Shen, Xuanjiang

    2011-08-01

    Supernumerary teeth is one of the teeth dysplasia that the number of teeth exceeded normal. Most of supernumerary teeth reported were located in anterior teeth region, but rare cases were reported in molar region. This paper reported three cases that supernumerary teeth located in molar region.

  5. Molar incisor hypomineralisation: clinical management of the young patient.

    LENUS (Irish Health Repository)

    Daly, Dympna

    2009-04-01

    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.

  6. Changes in heart rate during third molar surgery

    NARCIS (Netherlands)

    Hollander, M. H. J.; Schortinghuis, J.; Vissink, A.

    2016-01-01

    Anxiety is an undesirable psychological phenomenon. Patients are usually anxious when subjected to third molar surgery, but the pattern of anxiety is unknown. The aim of this study was to assess the intensity and course of anxiety during third molar surgery. This study included 48 consecutive

  7. Variant root morphology of third mandibular molar in normal and ...

    African Journals Online (AJOL)

    Variant root morphology of third mandibular molar in normal and impacted teeth. Isaac Kipyator Bokindo, Fawzia Butt, Francis Macigo. Abstract. The mandibular third molar poses a challenge to dental surgeons due to it's unpredictable morphology which leads to increased difficulty during its extraction. The root morphology ...

  8. Fatigue resistance of CAD/CAM resin composite molar crowns.

    NARCIS (Netherlands)

    Shembish, F.A.; Tong, H.; Kaizer, M.; Janal, M.N.; Thompson, V.P.; Opdam, N.J.M.; Zhang, Y.

    2016-01-01

    OBJECTIVE: To demonstrate the fatigue behavior of CAD/CAM resin composite molar crowns using a mouth-motion step-stress fatigue test. Monolithic leucite-reinforced glass-ceramic crowns were used as a reference. METHODS: Fully anatomically shaped monolithic resin composite molar crowns (Lava

  9. Excess molar volumes and isentropic compressibilities of binary ...

    Indian Academy of Sciences (India)

    Remaining five binary mixtures, n-heptane + toluene, cyclohexane + n-heptane, cyclohexane + n-hexane, toluene + nhexane and n-decane + n-hexane show negative excess molar volumes over the whole composition range. However, the large negative values of excess molar volume becomes dominant in toluene + ...

  10. Indications and risk factors for complications of lower third molar ...

    African Journals Online (AJOL)

    Aim: The aim of this study was to determine the surgical indications and risk factors for complications of third molar surgery at a Nigerian teaching hospital. ... records of patients referred to the Oral Surgery Clinic of our institution for surgical extraction of their impacted mandibular third molars from January 2008 to December ...

  11. Impacted Mandibular Third Molars: Review of Literature and a ...

    African Journals Online (AJOL)

    Keywords like impaction, mandibular third molar, impacted mandibular third molar, complications, anatomy, inferior alveolar nerve injury, lingual nerve injury were used to search the databases. A total of 826 articles were screened, and 50 articles were included in the review which was obtained from 1980 to February 2015.

  12. Prematurely erupted tooth in the molar region | Denloye | Nigerian ...

    African Journals Online (AJOL)

    This paper reports the case of a thirty-three-day old male child who was seen at the outpatient clinic of the University College Hospital, Ibadan with a tooth- like structure in the maxillary right molar region. This firm structure which resembled a primary molar had only two definite buccal cusps, no lingual cusp and no occlusal ...

  13. Pathomorphology of Molar Gestation in Zaria | Mayun | Nigerian ...

    African Journals Online (AJOL)

    Background: Molar gestations are a source of significant morbidity with increased risk of mortality from their complications if not identified and treated early enough. Objective: This study aims at histologically reviewing and analyzing all cases of molar gestations seen in the Histopathology Department of Ahmadu Bello ...

  14. Internal root morphology in mandibular first permanent molars in a ...

    African Journals Online (AJOL)

    Objective: To determine the internal root morphology and gender variations in mandibular first permanent molars in a Kenyan population. Design: In vitro descriptive cross sectional study. Setting: School of Dental Sciences, University of Nairobi Results: The mesial root of mandibular first molars had two canals in 96.3% of ...

  15. Molar pregnancy: a ten year review at Onitsha, Nigeria | Obiechina ...

    African Journals Online (AJOL)

    The incidence of molar pregnancy was 1:332 deliveries or 1.416 pregnancies. There was no definite age pattern in the distribution of molar pregnancy. The commonest clinical presentation was recurrent vaginal bleeding 90.6% while the least was uterine size less than date in 3.8% of the cases. Syntocinon induction with ...

  16. [Clinical analysis of caries status of the mandibular second molar].

    Science.gov (United States)

    You, Chun-an; Zheng, Ping; Hu, Ning; Su, Qin

    2014-04-01

    To collect the cases which have caries on the mandibular second molar and analyze the caries status and correlative factors. Patients treated in the Department of Endodontics in West China Hospital of Stomatology were randomly collected. The baseline information, primary sites and severity of dental caries on the mandibular second molar, and eruption pattern of the mandibular third molar were recorded. The data was analyzed with SPSS13.0 software package. Four hundred eighty-one patients including 227 males and 254 females were collected. Caries on the mandibular second molar starting from the occlusal, distal proximal and buccal surfaces accounted for 33.8%, 33.2% and 24.4%, respectively. Caries involving dental pulp (49.7%) were significantly more than deep and shallow to moderate caries (31.7% and 18.6%). Gender was not correlated with the site and severity of caries. However, impacted mandibular third molars and age were significantly related to both caries site and severity. Occlusal and distal proximal surfaces are the most predisposed sites to have caries on mandibular second molar. Impacted mandibular third molar and age are significantly related to caries of mandibular second molar.

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

    Directory of Open Access Journals (Sweden)

    Mohammad Ebrahimi Saravi

    2013-10-01

    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.

  18. Pulpotomies with portland cement in human primary molars

    Directory of Open Access Journals (Sweden)

    Taísa Regina Conti

    2009-02-01

    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.

  19. La Obligación de Entregar Mercaderías Libres de Derechos o Pretensiones de Terceros en la Convención de Viena de 1980 Sobre Compraventa Internacional.

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    Maximiliano Rodríguez

    2011-06-01

    Full Text Available El artículo 30 CISG establece que son tres las obligaciones principales del vendedor: la entrega de las mercaderías, la entrega de los documentos y la transferencia de la propiedad. Aun cuando la transferencia de la propiedad es una de las obligaciones principales en la Convención, dicho instrumento no regula el fondo o contenido de la misma. No obstante, algunas normas de la Convención sí establecen en términos generales que las mercaderías deben estar libres de pretensiones de terceros en lo que se refiere a la propiedad del mismo (Artículo 41 y libre de los derechos que emanan de la propiedad industrial (Artículo 42. El Presente artículo realiza un análisis de dicha obligación a la luz de la Convención de Viena y de la extensa doctrina y jurisprudencia sobre el tema.

  20. La Obligación de Entregar Mercaderías Libres de Derechos o Pretensiones de Terceros en la Convención de Viena de 1980 Sobre Compraventa Internacional.

    Directory of Open Access Journals (Sweden)

    Maximiliano Rodríguez

    2011-07-01

    Full Text Available El artículo 30 CISG establece que son tres las obligaciones principales del vendedor: la entrega de las mercaderías, la entrega de los documentos y la transferencia de la propiedad. Aun cuando la transferencia de la propiedad es una de las obligaciones principales en la Convención, dicho instrumento no regula el fondo o contenido de la misma. No obstante, algunas normas de la Convención sí establecen en términos generales que las mercaderías deben estar libres de pretensiones de terceros en lo que se refiere a la propiedad del mismo (Artículo 41 y libre de los derechos que emanan de la propiedad industrial (Artículo 42. El Presente artículo realiza un análisis de dicha obligación a la luz de la Convención de Viena y de la extensa doctrina y jurisprudencia sobre el tema.

  1. Extraction of maxillary first molars improves second and third molar inclinations in Class II Division 1 malocclusion

    NARCIS (Netherlands)

    Livas, C.; Halazonetis, D.J.; Booij, J.W.; Katsaros, C.

    2011-01-01

    INTRODUCTION: The aim of this study was to assess the changes in inclination of the maxillary second (M2) and third (M3) molars after orthodontic treatment of Class II Division 1 malocclusion with extraction of maxillary first molars. METHODS: Two groups of subjects were studied. The experimental

  2. Eruption status of third molars in South Indian city

    Directory of Open Access Journals (Sweden)

    Sujata M Byahatti

    2011-01-01

    Full Text Available Aim : The aim of the present study is to determine the number of third molars per person, angulation, level, amount of space for eruption of third molar between ramus of mandible and second molar status of root and also to study the difficulty index. Objective: To study the eruption status of third molar in South Indian population. Materials and methods: The study conducted at Department of Oral Medicine and Radiology. Maratha Mandals NG Halgekar College of Dental Sciences and Research Centre. Belgaum, Karnataka, India A total of 150 patients (54 females and 96 males visiting outpatient department between the age group of 17 and 30 with a mean age of 23.5 years were selected- Before starting the study, ethical concern taken from the ethical committee and informed consent from each patent who underwent radiographic examination. Results: The results showed approximately 94.66% of the subjects had all four third molars, 8.6% had three third molars, 4.6% had two third molars and 2% had one third molars with 3.3% having agenesis of all third molars. Third molar agenesis showed predilection for upper jaw with higher proportion in females (5 5% than males (2%. Angular position seen maximum with vertical position (66.16% with least being horizontal impactions. Level of occlusal plane of third molar similar to that of adjacent tooth seen in 52.65%. Below the occlusal plane in 19.61 %, totally impacted teeth noted in 27.73%. More than 75% of the teeth had complete root formation. Among total number of teeth, 518 (91.51 % teeth were easy to extract and remaining 33 (5.8% were difficult to extract. Conclusion: Radiological and clinical findings have correlated to assess whether teeth were easy to extract or difficult. Because of the increasing incidence of unerupted third molars and the association of numerous complications with these retained teeth, assessment of germ position and prognosis of third molar eruption is necessary for better patient management.

  3. Los créditos que disfrutan de fianza de terceros en España. Su clasificación antes y después de la reforma operada en la Ley Concursal por el Real Decreto Ley 3/2009

    Directory of Open Access Journals (Sweden)

    Rosalía Estupiñán Cáceres

    2013-07-01

    Full Text Available El presente trabajo analiza críticamente el tratamiento que la vigente Ley Concursal española (Ley 22/2003 otorga, dentro del procedimiento concursal, a los créditos que gozan de fianza de terceros tanto antes como después de la reforma de la anterior ley llevada a efectos por el Real Decreto Ley 3/2009.

  4. Los créditos que disfrutan de fianza de terceros en España. Su clasificación antes y después de la reforma operada en la Ley Concursal por el Real Decreto Ley 3/2009

    Directory of Open Access Journals (Sweden)

    Rosalía Estupiñán Cáceres

    2013-06-01

    Full Text Available El presente trabajo analiza críticamente el tratamiento que la vigente Ley Concursal española (Ley 22/2003 otorga, dentro del procedimiento concursal, a los créditos que gozan de fianza de terceros tanto antes como después de la reforma de la anterior ley llevada a efectos por el Real Decreto Ley 3/2009.

  5. Molar-incisor hypomineralization: Therapeutic challenge to paediatric dentistry practice

    Directory of Open Access Journals (Sweden)

    Stojković Branislava

    2017-01-01

    Full Text Available Introduction: Molar incisor hypomineralization indicates the appearance of enamel hypomineralization of systemic origin which occurs in 1-4 first permanent molars, which is often accompanied by changes on permanent incisors. Variations in clinical manifestation, together with commonly present asymmetry, are the reason for large variations in the needs for therapeutic treatment of these structural enamel defects. Case study: Two patients with diagnosed molar incisor hypomineralization are shown. The first patient, a six-year-old girl, with diagnosed mild clinical form, visited the dentist immediately after the eruption of the first permanent molars. Early diagnosis and timely application of preventive-profilactic measures, together with mild clinical form, are the reason for prevention of dental caries and further spreading of posteruptive enamel breakdown on affected first molars. Unlike the first one, the second patient, a 7,5-year-old girl had the diagnosis of moderate molar incisor hypomineralization. She developed dental caries on tooth 46 as well as complication in dental caries on tooth 36 which was extracted soon after the eruption. Conclusion: Early diagnosis and the severity of clinical appearance are the most important factors which determine therapeutic outcome of the treatment of molar incisor hypomineralization.

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

    Directory of Open Access Journals (Sweden)

    Patrícia Daniela Melchiors Angst

    2013-02-01

    Full Text Available 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 < 0.001 compared with NM; CAL was also greater in M (p < 0.001 and was affected by smoking (p = 0.007. The reductions obtained for periodontal indicators at day 180 showed similar responses between M and NM. For CAL, M (NS 0.57 ± 0.50; S 0.67 ± 0.64 and NM (NS 0.38 ± 0.23; S 0.50 ± 0.33 reached an almost significant difference (p = 0.05. Smoking did not influence the response to treatment. Multilevel analysis revealed that, only for PDD reductions, the interaction between sites, teeth and patient was significant (p < 0.001. It was concluded that M benefit from an adequate regimen of supragingival biofilm control; therefore, supragingival condition should be considered in the prognosis of molar teeth.

  7. Surgical approach to impacted mandibular third molars--operative classification.

    Science.gov (United States)

    Abu-El Naaj, Imad; Braun, Refael; Leiser, Yoav; Peled, Micha

    2010-03-01

    The aim of the present study is to suggest a convenient way to classify the position of the impacted third mandibular molar relative to the mandibular canal and to suggest indications for the use of each surgical approach for mandibular third molar extraction. The presented new typing system, Third Molar Classification (TMC), is a simple and easy-to-apply method for the surgical management of mandibular third molars and can be extended for any ectopic or impacted mandibular tooth. There are 3 major types of third molar positions. The second type is subdivided further into 2 subtypes. In the present study, 9 patients with high-risk mandibular third molars were treated according to the present classification and are presented and discussed. Patients typed as TMC IIb were treated with a sagittal split osteotomy approach and patients typed as TMC III were treated with an extraoral approach. The operative classification was successfully implemented in very rare cases of deeply impacted mandibular third molars. In 3 of 9 cases (33%) minor complications included some degree of hypoesthesia using the extraoral approach; these complications resolved spontaneously without the need for any intervention. The present study describes the use of a new surgical classification system for treatment planning in all types of mandibular third molar extractions. We believe that the present classification could help the oral and maxillofacial surgeon in decision-making and limit the possible risks that are present when attempting to extract impacted mandibular third molars. Copyright (c) 2010 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

  8. Autotransplantation of a mandibular third molar: A case report

    Directory of Open Access Journals (Sweden)

    Elham Najafi

    2017-09-01

    Full Text Available Tooth autotransplantation defines as transition of one tooth from one position to another, in same individual. It is a biological procedure in which teeth have the potential to induce alveolar bone growth. It can be applied in patients before adolescence growth is finished. It significantly reduces time and cost compared to implants. Healing rapidly occurs and function is regained almost immediately. Our case was a 15-year-old male that his left mandibular third molar transplanted to the second molar sight after extraction of second molar because of unrestorable crown. During 9 month follow up transplanted tooth was asymptomatic, functional and responsive to sensibility tests. (Cold test, EPT.

  9. Molar Pregnancy with a Co-Existing Viable Fetus

    Directory of Open Access Journals (Sweden)

    Ruya Deveer

    2014-03-01

    Full Text Available     The aim of this study was to report the clinical features, management, and outcome of a case of molar pregnancy with a coexisting viable fetus and to review the literature. In this article, we report a case of pregnancy with diffuse placental molar change and a normal fetus which presented with hyperemesis gravidarum and hyperthyroidism. Genetic amniocentesis showed normal fetal karyotype. A healthy full-term live male infant was delivered by cesarean section. In molar pregnancies with a normal karyotype fetus, with intensive maternal follow-up, continuation of pregnancy can be suggested.

  10. Elongational viscosity of narrow molar mass distribution polystyrene

    DEFF Research Database (Denmark)

    Bach, Anders; Almdal, Kristoffer; Rasmussen, Henrik Koblitz

    2003-01-01

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

  11. [Germectomy. The germ of the third mandibular molar in children: remove or preserve?].

    Science.gov (United States)

    Voorsmit, R A; van den Bergh, A W

    1992-11-01

    Third molars are often removed in order to prevent complications and various other problems associated with impacted third molars and their removal. Abortion of mandibular third molars is a procedure carried out at an early age in those subjects where there is insufficient room for the eruption of the third molars. On the other hand one can also decide to remove the second molars and to annexate orthodontically the third molars in the arch.

  12. A three-dimensional finite element analysis of molar distalization with a palatal plate, pendulum, and headgear according to molar eruption stage.

    Science.gov (United States)

    Kang, Ju-Man; Park, Jae Hyun; Bayome, Mohamed; Oh, Moonbee; Park, Chong Ook; Kook, Yoon-Ah; Mo, Sung-Seo

    2016-09-01

    This study aimed to (1) evaluate the effects of maxillary second and third molar eruption status on the distalization of first molars with a modified palatal anchorage plate (MPAP), and (2) compare the results to the outcomes of the use of a pendulum and that of a headgear using three-dimensional finite element analysis. Three eruption stages were established: an erupting second molar at the cervical one-third of the first molar root (Stage 1), a fully erupted second molar (Stage 2), and an erupting third molar at the cervical one-third of the second molar root (Stage 3). Retraction forces were applied via three anchorage appliance models: an MPAP with bracket and archwire, a bone-anchored pendulum appliance, and cervical-pull headgear. An MPAP showed greater root movement of the first molar than crown movement, and this was more noticeable in Stages 2 and 3. With the other devices, the first molar showed distal tipping. Transversely, the first molar had mesial-out rotation with headgear and mesial-in rotation with the other devices. Vertically, the first molar was intruded with an MPAP, and extruded with the other appliances. The second molar eruption stage had an effect on molar distalization, but the third molar follicle had no effect. The application of an MPAP may be an effective treatment option for maxillary molar distalization.

  13. Review of molar tooth structure research

    Directory of Open Access Journals (Sweden)

    Hong-Wei Kuang

    2014-10-01

    Full Text Available For more than a century, molar tooth structure (MTS has been studied. The study developed in three stages. During the first stage (before 1980, researchers described three basic morphologies of MTS, mainly from the Belt Supergroup in North America, and they provided several hypotheses for the origin of MTS. During the second stage (1980–1999, the frequent discoveries of MTS on all continents resulted in many detailed descriptions of their shape and in several hypotheses concerning the origin of MTS. Notably, hypotheses of MTS’s origin such as seismic activity and biological activity were developed. Since 2000, research has progressed into a new stage (the third stage. This is due to discoveries of MTS in the Meso–Neoproterozoic of China and elsewhere, and the ongoing debate on the seismic or biological origin is replaced by a hypothesis that involves gas expansion and chemically-controlled carbonate precipitation (both of them possibly affected by biological activities. This latter idea has gradually been commonly recognized as the mainstream theory. Despite continued disagreements, researchers now agree that microsparry calcite played a controlling role regarding the development and the global distribution of MTS in time and space during the Proterozoic, the morphological diversity, and the impact on the sedimentary environment. The present contribution analyses the three major hypotheses regarding the origin of MTS; it also discusses the shortcomings of the hypotheses regarding a seismic or biologic origin, and it details the modern hypothesis that links formation of cracks to the precipitation of sparry calcite. It is deduced that important questions dealing with the Precambrian can be answered, among other aspects regarding the depositional palaeogeography and stratigraphic correlations.

  14. Preformed crowns for decayed primary molar teeth.

    Science.gov (United States)

    Innes, Nicola P T; Ricketts, David; Chong, Lee Yee; Keightley, Alexander J; Lamont, Thomas; Santamaria, Ruth M

    2015-12-31

    Crowns for primary molars are preformed and come in a variety of sizes and materials to be placed over decayed or developmentally defective teeth. They can be made completely of stainless steel (know as 'preformed metal crowns' or PMCs), or to give better aesthetics, may be made of stainless steel with a white veneer cover or made wholly of a white ceramic material. In most cases, teeth are trimmed for the crowns to be fitted conventionally using a local anaesthetic. However, in the case of the Hall Technique, PMCs are pushed over the tooth with no local anaesthetic, carious tissue removal or tooth preparation. Crowns are recommended for restoring primary molar teeth that have had a pulp treatment, are very decayed or are badly broken down. However, few dental practitioners use them in clinical practice. This review updates the original review published in 2007. Primary objectiveTo evaluate the clinical effectiveness and safety of all types of preformed crowns for restoring primary teeth compared with conventional filling materials (such as amalgam, composite, glass ionomer, resin modified glass ionomer and compomers), other types of crowns or methods of crown placement, non-restorative caries treatment or no treatment. Secondary objectiveTo explore whether the extent of decay has an effect on the clinical outcome of primary teeth restored with all types of preformed crowns compared with those restored with conventional filling materials. We searched the following electronic databases: Cochrane Oral Health Group Trials Register (to 21 January 2015), Cochrane Central Register of Controlled Trials (CENTRAL; The Cochrane Library, 2014, Issue 12), MEDLINE via Ovid (1946 to 21 January 2015) and EMBASE via Ovid (1980 to 21 January 2015). We searched the US National Institutes of Health Trials Register (http://clinicaltrials.gov) and the World Health Organization (WHO) International Clinical Trials Registry Platform for ongoing trials and Open Grey for grey literature (to

  15. Disturbio neurosensorial del nervio dentario inferior asociado al tratamiento endodóntico de una tercera molar. Reporte de caso

    OpenAIRE

    Arce De La Cruz, Erika Gaby; Facultad de Estomatología, Universidad Peruana Cayetano Heredia. Lima,; Hernández Añaños, Felipe; Facultad de Estomatología, Universidad Peruana Cayetano Heredia. Lima,

    2014-01-01

    El disturbio neurosensorial del nervio dentario inferior es una complicación que puede ocurrir luego de realizar algunos procedimientos odontológicos como: exodoncia de dientes retenidos,colocación de implantes, y tratamientos endodónticos quirúrgicos y no quirúrgicos. Puede haber daño por injuria mecánica (sobrepase de instrumentos), injuria química (pasaje de hipoclorito o selladores endodónticos) e injuria térmica (sobrecalentamiento por procedimientos quirúrgicos). Los distubios neurosens...

  16. Mandibular second molar periodontal healing after impacted third molar extraction in young adults.

    Science.gov (United States)

    Faria, Ana Inocêncio; Gallas-Torreira, Mercedes; López-Ratón, Mónica

    2012-12-01

    To estimate the prevalence of preoperative periodontal defects and analyze 12-month spontaneous healing on the distal aspect of the mandibular second molar (M2) after impacted mandibular third molar (M3) extraction. This prospective clinical study was conducted in 25 healthy young patients (21.03 ± 4.38 yr old) with 40 extractions of higher-risk periodontal impacted M3s. Plaque and gingival indexes, recession, bleeding on probing, probing depth (PD), and attachment level were recorded before surgery and at 3, 6, and 12 months after surgery at 5 sites on the distal aspect of the M2. The initial mean PD was 5.70 ± 3.80 mm, with the deepest mean PD at the lingual side. At 12 months, a mean PD average of 3.77 ± 2.86 mm was recorded, with a total average recovery of 1.93 ± 2.46 mm (P periodontal defects that are deepest at the lingual side and almost recover at 12 months after extraction. The first 3 months is considered the cutoff for periodontal healing. Young adults with high-risk periodontal M3 impactions may benefit from early extraction, which increases spontaneous periodontal healing. Copyright © 2012 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

  17. Hipomineralização molar-incisivo = Molar incisor hypomineralization

    Directory of Open Access Journals (Sweden)

    Basso, Ana Paula

    2007-01-01

    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

  18. Excess Molar Volume of Binary Systems Containing Mesitylene

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    Morávková, L.

    2013-05-01

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

  19. Impacted Mandibular Third Molars: Review of Literature and a ...

    African Journals Online (AJOL)

    Impacted Mandibular Third Molars: Review of Literature and a Proposal of a Combined ... Annals of Medical and Health Sciences Research ... has a PDF reader plug-in installed (for example, a recent version of Adobe Acrobat Reader).

  20. Prediction of postoperative pain after mandibular third molar surgery

    DEFF Research Database (Denmark)

    Rudin, Asa; Eriksson, Lars; Liedholm, Rolf

    2010-01-01

    To evaluate the predictive potential of preoperative psychological and psychophysiological variables in estimating severity of postoperative pain following mandibular third molar surgery (MTMS). Methods: Following ethical committee approval and informed consent, 40 consecutive patients scheduled...

  1. Managing molar-incisor hypomineralization: A systematic review.

    Science.gov (United States)

    Elhennawy, Karim; Schwendicke, Falk

    2016-12-01

    We systematically reviewed treatment modalities for MIH-affected molars and incisors. Trials on humans with ≥1 MIH molar/incisor reporting on various treatments were included. Two authors independently searched and extracted records. Sample-size-weighted annual failure rates were estimated where appropriate. The risk of bias was assessed using the Newcastle-Ottawa scale. Electronic databases (PubMed, Embase, Cochrane CENTRAL, Google Scholar) were screened, and hand searches and cross-referencing performed. Fourteen (mainly observational) studies were included. Ten trials (381 participants) investigated MIH-molars, four (139) MIH-incisors. For molars, remineralization, restorative or extraction therapies had been assessed. For restorative approaches, mean (SD) annual failure rates were highest for fissure sealants (12[6]%) and glass-ionomer restorations (12[2]%), and lowest for indirect restorations (1[3]%), preformed metal crowns (1.3 [2.1]%) and composite restorations (4[3]%). Ony study assessed extraction of molars in young patients (median age 8.2 years), the majority of them without malocclusions, but third molars in development. Spontaneous alignment of second molars was more frequent in the maxilla (55%) than the mandible (47%). For incisors, desensitizing agents successfully managed hypersensitivity. Micro-abrasion and composite veneers improved aesthetics. Few, mainly moderate to high-risk-studies investigated treatment of MIH. Remineralization or sealants seem suitable for MIH-molars with limited severity and/or hypersensitivity. For severe cases, restorations with composites or indirect restorations or preformed metal crowns seem suitable. Prior to tooth extraction as last resort factors like the presence of a general malocclusion, patients' age and the status of neighboring teeth should be considered. No recommendations can be given for MIH-incisors. Dentists need to consider the specific condition of each tooth and the needs and expectations of

  2. Fusion or gemination? An unusual mandibular second molar

    Directory of Open Access Journals (Sweden)

    Angela Jordão Camargo

    2016-01-01

    Full Text Available Fusion and gemination is not an uncommon finding and affected most primary dentition and the permanent maxillary incisors. These changes can develop a series of complication. A 11-year-old male presented radiography finding: an unusual mandibular second molar. A well-documented case brings a challenge for radiologists classify between fusion and gemination. In conclusion, this alteration although common in other regions, there are no case in the literature involving “second and third” molar.

  3. Anxiety before extraction of impacted lower third molars

    OpenAIRE

    Tarazona Álvarez, Beatriz; Tarazona Álvarez, Pablo; Peñarrocha Oltra, David; Rojo Moreno, Juan; Peñarrocha Diago, María

    2015-01-01

    Objetives: Assess levels of trait anxiety, state anxiety and dental anxiety before extraction of lower third molars and check the correlation and reliability of the scales used for the measurement of preoperative anxiety. Study Design: A prospective study of patients treated with extraction of a lower third molar between September 2010 to December 2010 was carried out. A total of 125 patients were included in the study. All of them were patients of the Oral Surgery and Implantology Department...

  4. A retrospective study of sodium hypochlorite pulpotomies in primary molars

    OpenAIRE

    Li, Tzu-Ying; Chuang, Li-Chuan; Aileen I Tsai

    2016-01-01

    Background/purpose: Formocresol has been a popular pulpotomy medicament for primary molars, however, its toxicity and potential carcinogenicity leaves room for other alternatives such as sodium hypochlorite (NaOCl). The purpose of this study is to evaluate the clinical and radiographic success rate of 5% NaOCl pulpotomy in primary molars. Materials and methods: A retrospective research of patient records from January 1, 2009 and December 31, 2012 was conducted to evaluate the clinical and ...

  5. APROXIMACIÓN A LA CONSERVACIÓN DE LOS BOSQUES AMAZÓNICOS A PARTIR DE LAS CONCEPCIONES DE LAS AVES EN LOS ESTUDIANTES DE GRADO TERCERO DE LA ESCUELA NORMAL SUPERIOR MONSEÑOR MARELINO EDUARDO CAYNES

    Directory of Open Access Journals (Sweden)

    July Milena Trujillo Duarte

    2013-07-01

    las concepciones de las aves en los estudiantes del grado tercero (3.1 J.T de la Escuela Normal Superior sede C, permiten fomentar la conservación de los bosques tropicales en un contexto intercultural, por medio de la investigación acción, en donde se pretende generar un nuevo conocimiento significativo y acorde con las características del contexto, para ello se utilizaron instrumentos como recolecta de información, grabaciones, fotografías, entre otros, que posibilitaron, teniendo en cuenta la riqueza de concepciones, proponer por parte de los estudiantes distintas alternativas que contribuyeron a la conservación: la realización de una campaña informativa sobre las problemáticas presentes en el colegio; la recolección de basuras tanto al interior como al exterior de la institución; además del desarrollo de una obra de teatro, en la cual se logró mostrar las causas de las diferentes acciones socioeconómicas que acaban con la selva amazónica, y perjudi can a la comunidad. Este estudio mostro la importancia de tener en cuenta el contexto en la realización de actividades, permitió además observar las concepciones tanto biológicas y culturales que tiene los estudiantes sobre las aves, al igual que reconocer conocimientos, creencias y prácticas que giran alrededor de estas, las cuales se perderían, sí los bosques tropicales desaparecieran, pues surgen a partir de las relaciones que se han establecido durante generaciones, debido a esto se pudo fomentar su conservación, evidenciándosela relevancia del diálogo entre conocimientos, ya que puede contribuir a transformar la realidad.

  6. Prevalence of Taurodont molars in a North Indian population.

    Science.gov (United States)

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

    2015-01-01

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

  7. Caries Management Strategies for Primary Molars

    Science.gov (United States)

    Santamaria, R.M.; Innes, N.P.T.; Machiulskiene, V.; Evans, D.J.P.; Splieth, C.H.

    2014-01-01

    Minimal invasive approaches to managing caries, such as partial caries removal techniques, are showing increasing evidence of improved outcomes over the conventional complete caries removal. There is also increasing interest in techniques where no caries is removed. We present the 1-yr results of clinical efficacy for 3 caries management options for occlusoproximal cavitated lesions in primary molars: conventional restorations (CR; complete caries removal and compomer restoration), Hall technique (HT; no caries removal, sealing in with stainless steel crowns), and nonrestorative caries treatment (NRCT; no caries removal, opening up the cavity, teaching brushing and fluoride application). In sum, 169 children (3-8 yr old; mean, 5.56 ± 1.45 yr) were enrolled in this secondary care–based, 3-arm, parallel-group, randomized clinical trial. Treatments were carried out by specialist pediatric dentists or postgraduate trainees. One lesion per child received CR, HT, or NRCT. Outcome measures were clinical failure rates, grouped as minor failure (restoration loss/need for replacement, reversible pulpitis, caries progression, etc.) and major failure (irreversible pulpitis, abscess, etc.). There were 148 children (87.6%) with a minimum follow-up of 11 mo (mean, 12.23 ± 0.98 mo). Twenty teeth were recorded as having at least 1 minor failure: NRCT, n = 8 (5%); CR, n = 11 (7%); HT, n = 1 (1%) (p = .002, 95% CI = 0.001 to 0.003). Only the comparison between NRCT and CR showed no significant difference (p = .79, 95% CI = 0.78 to 0.80). Nine (6%) experienced at least 1 major failure: NRCT, n = 4 (2%); CR, n = 5 (3%); HT, n = 0 (0%) (p = .002, 95% CI = 0.001 to 0.003). Individual comparison of NRCT and CR showed no statistically significant difference in major failures (p = .75, 95% CI = 0.73 to 0.76). Success and failure rates were not significantly affected by pediatric dentists’ level of experience (p = .13, 95% CI = 0.12 to 0.14). The HT was significantly more successful

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

    Energy Technology Data Exchange (ETDEWEB)

    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

    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.

  9. Orthodontic Replacement of Lost Permanent Molar with Neighbor Molar: A Six-Year Follow-Up

    Directory of Open Access Journals (Sweden)

    Taisa Boamorte Raveli

    2017-01-01

    Full Text Available Extraction is very frequent indication in orthodontic planning, especially when there are crowding, biprotrusion, and aesthetically unpleasant profiles. Next to extraction comes space closure, which represents a challenge for orthodontists because of extended treatment time, discomfort created for the patient, tissue tolerance, and stability concerns. When it comes to what mechanics to choose for space closure, loops present two major advantages in relation to sliding mechanics: absence of abrasion and possibility to reach pure dental translation. A case is presented where an adult female patient with early loss of the first lower permanent molars, minor lower crowding, and tooth biprotrusion was treated with upper first bicuspids extraction along with upper and lower space closure done with T-loops to promote best space closure control in order to correct the malocclusion and enhance facial aesthetics.

  10. Pattern of third molar impaction in a Saudi population

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    Ali H Hassan

    2010-10-01

    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 

  11. Molar Intrusion in Open-bite Adults Using Zygomatic Miniplates.

    Science.gov (United States)

    Marzouk, Eiman S; Abdallah, Essam Mohamed; El-Kenany, Walid A

    2015-01-01

    The aim of this study is to evaluate the skeletal, dental and soft tissue changes that arise after intrusion of the maxillary molars using zygomatic miniplates in adult skeletal anterior open bite patients. In addition to measuring the amount and rate of molar intrusion; with special emphasis on changes in the axial inclination of the intruded molars. The study group was composed of 13 anterior open bite patients (mean age 18 years, 8 months ± 2 years, 2 months) with posterior dentoalveolar excess. Mini-plates were placed in the zygomatic buttress bilaterally. The upper arch was segmentally leveled and a double Trans-Palatal Arch (TPA) was bonded. Closed NiTi coil spring was placed bilaterally between the book of the mini-plate just mesial and distal to the first molar buccal tube applying intrusive force of 450 gper side. Lateral and posteroanterior cephalograms were taken before intrusion (T1: post upper segmental leveling) and after intrusion (T2). Comparison between means before and after the intrusion was done using Wilcoxon Signed Ranks test (WSRT). Mandibular autorotation followed the molar intrusion, SNB and SN-Pog angles significantly increased while the ANB, MP-SN angle and N-S-Gn angle significantly decreased. The mean amount of accomplished molar intrusion was 3.1mm ± 0.74mm, with a rate of 0.36mm per month ± 0.08mm per month and a bite closure of 6.55mm ± 1.83mm. There was no significant buccal tip in the right and left molars upon intrusion. Conclusion: Miniplates zygomatic anchorage can be used effectively for skeletal open bite correction through posterior dento-alveolar intrusion. Intrusion of the posterior teeth with skeletal anchorage induced counterclockwise rotation of the mandible and, as a consequence, corrected the anteroposterior intermaxillary relationship with a dramatic improvement in the facial soft tissue convexity.

  12. Enfoque quirúrgico de canino incluido en el paladar: Reporte de un caso y revisión dela literatura

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    Adel Martínez Martínez

    2013-10-01

    Full Text Available ResumenLa inclusión dental hace referencia a la anomalía en la cual el diente pierde la fuerza de erupción y se encuentra sumergido en el maxilar con o sin patología asociada. El diente que más frecuentemente queda retenido después de los terceros molares mandibulares es el canino maxilar con una prevalencia que oscila entre el 1- 2.2 % dependiendo de la población evaluada. El diagnóstico de un canino incluido en el maxilar se realiza mediante evaluación clínica que incluye la inspección y palpación además del examen radiográfico periapical y panorámico. Varias opciones de tratamiento se pueden aconsejar al paciente desde el tratamiento interceptivo, la remoción quirúrgica del canino retenido, la exposición quirúrgica y tracción ortodóntica, el trasplante hasta el tratamiento no activo y observación, valorando las características individuales tanto del paciente como de la situación e inclinación del diente. A continuación se realiza una revisión bibliográfica seguida del reporte de caso clínico de un canino retenido en paladar en un paciente masculino de 27 años de edad donde esta indicada la extracción quirúrgica. (Duazary 2009 I; 56-61AbstractDental inclusion is when the tooth has lost the forcing eruption and is submerge in the maxilla with or any pathology. Maxillary canine are the most frecuently impacted teeth after the third molar with a prevalence ranging from 1 to 2•2% depending on the population examined. The diagnosis of an impacted maxillary canine is based through clinical evaluation that includes inspection, palpation and radiographic examination that involve taking periapical and orthopantomograph radiographs. Patient counseling on the various treatment options, from the interceptive treatment, the surgical remove of the ectopic canine, the surgical exposure and orthodontic alignment, the transplantation until the no active treatment and observation. We carried out a bibliographical revision

  13. Uterine rupture following incomplete molar pregnancy: a case report

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    Pourali L

    2013-03-01

    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.

  14. Histopathologic Evaluation of Follicular Tissues Associated with Impacted Third Molars

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    M. Khorasani

    2008-06-01

    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.

  15. Prevalence of Taurodont Molars in a Selected Iranian Adult Population.

    Science.gov (United States)

    Jamshidi, Davoud; Tofangchiha, Maryam; Jafari Pozve, Nasim; Mohammadpour, Mahdis; Nouri, Bijan; Hosseinzadeh, Kazem

    2017-01-01

    Taurodontism is an anomaly characterized by elongated crowns and consumedly apical location of the bifurcation area. This study aimed to determine the prevalence of taurodontism in molars based on digital panoramic radiographies in eight cities of Iran. This descriptive cross-sectional study was conducted on 2360 digital panoramic radiographs taken for different treatment purposes. Demographic information of patients was recorded and radiographs were evaluated for presence of taurodont molars. The prevalence rates were calculated and the data were analyzed using SPSS software version 18 via paired t-test, chi square test and ANOVA. A total of 2360 panoramic radiographs (from 51.4% male and 48.6% female patients) were evaluated and the prevalence of taurodontism was reported 22.9% (22.6% in males and 23.3% in females) (P>0.05). Its prevalence was 51.67% in the right and 48.33% in the left quadrants (P>0.05), 34.1% in the mandible and 65.9% in the maxilla (P=0.000) and 79.52% in the second and 20.48% in the first molar (P=0.000). The prevalence of hypotaurodontism, mesotaurodontism and hypertaurodontism was 84.13%, 11.07% and 4.8%, respectively. The prevalence of taurodont molars was high in Iran and it was more common in the second molars and in the maxilla. Hypotaurodontism had the highest prevalence.

  16. External root resorption of the second molar associated with third molar impaction: comparison of panoramic radiography and cone beam computed tomography.

    Science.gov (United States)

    Oenning, Anne Caroline Costa; Neves, Frederico Sampaio; Alencar, Phillipe Nogueira Barbosa; Prado, Rodrigo Freire; Groppo, Francisco Carlos; Haiter-Neto, Francisco

    2014-08-01

    The aim of the present study was to compare panoramic radiography and cone beam computed tomography (CBCT) for the assessment of external root resorption (ERR) of second molars associated with impacted third molars. In addition, the prevalence of ERR in second molars and the inclinations of the third molars more associated with ERR were investigated in both imaging methods. The sample consisted of 66 individuals with maxillary and mandibular impacted third molars (n = 188) seen on panoramic radiographs and CBCT images. The presence of ERR on the adjacent second molar was investigated, and the position of the third molar was determined using Winter's classification (vertical, horizontal, mesioangular, distoangular, and transverse). Statistical analysis was performed using the χ(2) test, Fisher exact test, and 2-proportion Z test (the significance level was set at 5%). A significantly greater number of cases of ERR (P third molars in mesioangular and horizontal inclinations were more likely to cause resorption of the adjacent teeth. CBCT should be indicated for the diagnosis of ERR in second molars when direct contact between the mandibular second and third molars has been observed on panoramic radiographs, especially in mesioangular or horizontal impactions. Furthermore, considering the propensity of these teeth to cause ERR in second molars, third molar prophylactic extraction could be suggested. Copyright © 2014 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

  17. La hiperdontia en región de molares Hyperdontia in molar region

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    George Táccio de Miranda Candeiro

    2011-12-01

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

  18. Variation in buccal surface morphology of deciduous first molars

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    M Simratvir

    2012-01-01

    Full Text Available Background: The buccal bulge of the deciduous first molars has always been a restorative challenge to the pediatric dentist. Morphologically it may vary from a slight prominence to a well-developed cusp-like structure. Aim: This study was conducted to determine the variable buccal surface morphology of deciduous first molar and its clinical relevance. Materials and Methods: A prospective study was conducted whereby 2016 patients visiting the outpatient clinic of dental hospital over 1 year were evaluated. Any variation in buccal surface morphology of the deciduous first molars was recorded photographically or by replicating in dental stone. Results: Varied morphological patterns on buccal surface were observed for which a new classification scheme has been proposed. Conclusion: The surface morphology of deciduous teeth crowns must be studied carefully as it may be indicative of pulpal extensions and accessory roots, requiring consideration during restorative treatment planning.

  19. Pendulum Therapy of Molar Distalization in Mixed Dentition.

    Science.gov (United States)

    Patil, Raju Umaji; Prakash, Amit; Agarwal, Anshu

    2016-01-01

    Early and timely pedo-orthodontic treatment is aimed at eliminating the disturbances of skeletal or dentoalveolar development, to harmonize the stomatognathic system before the full eruption of all permanent teeth. The advantages of pendulum appliance are its minimal dependence on patient's compliance (child cooperation), ease of fabrication, onetime activation and adjustment of the springs if necessary to correct minor transverse and vertical molar positions. This article reports a successful treatment method of class II malocclusion with pendulum appliance in mixed dentition phase. Distalization of maxillary molar was done, followed by guidance of canine impaction orthodontically and other dental correction using 0.022 MBT appliances. Posttreatment results were stable and remarkable. How to cite this article: Patil RU, Prakash A, Agarwal A. Pendulum Therapy of Molar Distalization in Mixed Dentition. Int J Clin Pediatr Dent 2016;9(1):67-73.

  20. Anxiety and extraction of third molars in Turkish patients.

    Science.gov (United States)

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

    2004-12-01

    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.

  1. Microbiology of the pericoronal pouch in mandibular third molar pericoronitis.

    Science.gov (United States)

    Leung, W K; Theilade, E; Comfort, M B; Lim, P L

    1993-10-01

    The microorganisms associated with mandibular third molar pericoronitis were investigated using direct microscopy and anaerobic culture method. The pericoronal pouch was sampled with paper points in A) 8 patients without mandibular third molar pericoronitis and B) 6 patients with mandibular third molar pericoronitis. Under the microscope, the microflora was found to be a complex mixture comprising gram-positive and gram-negative cocci, rods and filaments (including fusiform and curved rods), motile rods and spirochetes. Significantly higher proportions of motile, gram-negative rods were found in group B than in group A. The predominant cultivable microflora of 9 samples: A (4) and B (5) comprised several species of facultative and obligate anaerobic bacteria, namely Peptostreptococcus, Streptococcus, Actinomyces, Eubacterium, Propionibacterium, Veillonella, Porphyromonas, Prevotella, Bacteriodes, Fusobacterium, Campylobacter, Staphylococcus, Stomatococcus, Lactobacillus, Neisseria, Capnocytophaga, Haemophilus, Selenomonas and Centipeda species. The microflora in pericoronitis appeared similar to that of diseased periodontal pockets.

  2. COMPLICATIONS AFTER EXTRACTION OF IMPACTED THIRD MOLARS - LITERATURE REVIEW

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    Elitsa G. Deliverska

    2016-07-01

    Full Text Available Third molar surgery is the most common procedure performed by oral and maxillofacial surgeons worldwide. This article addresses the incidence of specific complications and, where possible, offers a preventive or management strategy. Complications, such as pain, dry socket, swelling, paresthesia of the lingual or inferior alveolar nerve, bleeding, and infection are most common. Factors thought to influence the incidence of complications after third molar removal include age, gender, medical history, oral contraceptives, presence of pericoronitis, poor oral hygiene, smoking, type of impaction, relationship of third molar to the inferior alveolar nerve, surgical time, surgical technique, surgeon experience, use of perioperative antibiotics, use of topical antiseptics, use of intra-socket medications, and anaesthetic technique. For the general dental practitioner, as well as the oral and maxillofacial surgeon, it is important to be familiar with all the possible complications after this procedure. This improves patient education and leads to prevention, early recognition and management.

  3. Solution viscosity – molar mass relationships for poly(butylene succinate and discussion on molar mass analysis

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    Q. Charlier

    2015-05-01

    Full Text Available Poly(butylene succinate (PBS is currently developing due to its biodegradability and the similarity of its mechanical properties to those of polyolefins. Relationships between the number average molar mass, Mn, and solution viscosity such as [η] and ηred were derived for this aliphatic polyester. Mn values were determined by end-group analysis and size exclusion chromatography (SEC. Mark-Houwink-Sakurada (MHS parameters were proposed in two solvents and for the different molar masses and viscosity measurement methods. As an example, the MHS equations were respectively, [η] =6.4•10–4•Mn0.67 in chloroform and [η] = 7.1•10–4•Mn0.69 in 50/50 wt% 1,2-dichlorobenzene/phenol at 25°C for molar masses measured by SEC in hexafluoro isopropanol (HFIP with poly(methyl methacrylate (PMMA standards. Empirical relationships were also suggested to derive Mn directly from reduced viscosity, ηred, which is much easier to determine than intrinsic viscosity. With these data, the number average molar mass of PBS can be conveniently estimated from a single viscosity measurement. In addition, it was shown that PBS contains 1–2 wt% of cyclic oligomers produced during esterification and that molar masses determined by taking this fraction into account or not were significantly different, especially for long chains.

  4. Piezoelectric Versus Conventional Rotary Techniques for Impacted Third Molar Extraction

    Science.gov (United States)

    Jiang, Qian; Qiu, Yating; Yang, Chi; Yang, Jingyun; Chen, Minjie; Zhang, Zhiyuan

    2015-01-01

    Abstract Impacted third molars are frequently encountered in clinical work. Surgical removal of impacted third molars is often required to prevent clinical symptoms. Traditional rotary cutting instruments are potentially injurious, and piezosurgery, as a new osteotomy technique, has been introduced in oral and maxillofacial surgery. No consistent conclusion has been reached regarding whether this new technique is associated with fewer or less severe postoperative sequelae after third molar extraction. The aim of this study was to compare piezosurgery with rotary osteotomy techniques, with regard to surgery time and the severity of postoperative sequelae, including pain, swelling, and trismus. We conducted a systematic literature search in the Cochrane Library, PubMed, Embase, and Google Scholar. The eligibility criteria of this study included the following: the patients were clearly diagnosed as having impacted mandibular third molars; the patients underwent piezosurgery osteotomy, and in the control group rotary osteotomy techniques, for removing impacted third molars; the outcomes of interest include surgery time, trismus, swelling or pain; the studies are randomized controlled trials. We used random-effects models to calculate the difference in the outcomes, and the corresponding 95% confidence interval. We calculated the weighted mean difference if the trials used the same measurement, and a standardized mean difference if otherwise. A total of seven studies met the eligibility criteria and were included in our analysis. Compared with rotary osteotomy, patients undergoing piezosurgery experienced longer surgery time (mean difference 4.13 minutes, 95% confidence interval 2.75–5.52, P trismus in the piezosurgery groups. The number of included randomized controlled trials and the sample size of each trial were relatively small, double blinding was not possible, and cost analysis was unavailable due to a lack of data. Our meta-analysis indicates that although

  5. Partial Molar Volumes of Aqua Ions from First Principles.

    Science.gov (United States)

    Wiktor, Julia; Bruneval, Fabien; Pasquarello, Alfredo

    2017-08-08

    Partial molar volumes of ions in water solution are calculated through pressures obtained from ab initio molecular dynamics simulations. The correct definition of pressure in charged systems subject to periodic boundary conditions requires access to the variation of the electrostatic potential upon a change of volume. We develop a scheme for calculating such a variation in liquid systems by setting up an interface between regions of different density. This also allows us to determine the absolute deformation potentials for the band edges of liquid water. With the properly defined pressures, we obtain partial molar volumes of a series of aqua ions in very good agreement with experimental values.

  6. Treatment of Ectopic Mandibular Second Permanent Molar with Elastic Separators

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    R. Rajesh

    2014-01-01

    Full Text Available 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.

  7. Partial molar quantity of an intensive mother function

    Science.gov (United States)

    Koga, Yoshikata

    2012-09-01

    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 δni keeping others constant and measure the response of the system in terms of an intensive mother function, Φ, δΦ. We then define its partial molar quantity of the ith component, ϕi, as ϕi = [δΦ/{δni/(N + δni)

  8. First molar health status in different craniofacial relationships

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    Linjawi AI

    2016-07-01

    Full Text Available Amal I Linjawi Department of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia Objective: To investigate the association between the health status of permanent first molars and different craniofacial relationships among adolescents. Study design: This is a retrospective study on patients’ records aged 11–15 years. Sex, skeletal relationship, vertical growth pattern, malocclusion, overjet, and overbite were assessed. The health status of permanent first molars was recorded from the orthopantomograms and intraoral photographs as “sound” and “not sound”. Chi-square, Mann–Whitney U and Kruskal–Wallis tests, and Pearson’s correlation coefficient were used to analyze and correlate the assessed variables. Significance level was set at P<0.05. Results: A total of 210 records were evaluated; 81 were male, 68 had Class I and 91 had Class II skeletal relationships. More than half of the subjects had normal (n=67 to moderate deep bite (n=72; normal (n=91, moderately increased (n=54, to severely increased (n=50 overjet; and Class I (n=106 and Class II division 1 (n=75 malocclusion. Significant differences were found in the health status of the permanent first molars with respect to sex (P=0.034, vertical growth pattern (P=0.01, and overbite (P=0.047. Strong correlations were only found between the health status of the permanent first molars and the following variables: sex (P=0.036 and vertical growth pattern (P=0.004. Significant correlation was further found between the upper left first molar health status and sex (P=0.019 and the lower right first molar health status and the vertical growth pattern (P=0.001. No significant association was found with the anteroposterior craniofacial relationships (P>0.05. Conclusion: Sex difference and vertical growth patterns were found to be potential predictors of the health status of the permanent first molars. No significant association was found with the

  9. Special Contribution: Third Molar Clinical Trials Annotated Bibliography.

    Science.gov (United States)

    White, Raymond P; Fisher, Elda L; Magraw, Caitlin B L; Phero, James; Abdelbaky, Omar; Sherwood, Colin; Nelson, Blake

    2016-01-01

    To provide clinicians with an annotated bibliography of published articles from research funded externally by the Oral and Maxillofacial Surgery Foundation, spanning 1996 to 2015, addressing the topic of third molar management. A brief summary for each article was generated by the respective authors. The complete annotated bibliography generated by the authors is included in the Appendix. The annotated bibliography provides clinicians and other interested individuals with a summary of current literature emanating from clinical studies on third molar topics. Copyright © 2016 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

  10. Patient's perception on mini-screws used for molar distalization

    OpenAIRE

    Blaya, Micéli Guimarães; Blaya, Diego Segatto; Guimarães, Magáli Beck; Hirakata, Luciana M.; Marquezan, Marcela

    2010-01-01

    PURPOSE: The objective of this study was to evaluate and compare the perceived pain intensity, side effects and discomfort related to the moment of placement, during mechanics and removal of a mini-screw for molar distalization in orthodontic treatment. METHODS: The sample consisted of 30 adult patients with a mean age of 30 years old, with class II malocclusion subdivision right or left. A mini-screw was installed in each patient, in the maxillary arch to provide a molar distalization. The p...

  11. Sentidos y significados de la diversidad cultural, que han configurado las niñas y los niños de grado tercero de primaria en la sede varones, de la Institución Educativa Susana trochez de Vivas del municipio de Caldono, departamento del Cauca, en sus contextos educativos

    OpenAIRE

    Quisoboni Galíndez, Yolima Teresa; Miranda Campo, María Piedad

    2016-01-01

    Tesis (Maestría en Educación desde la Diversidad). Universidad de Manizales. Facultad de Ciencias Sociales y Humanas, 2016 El presente trabajo investigativo, titulado: Sentidos y significados de la diversidad cultural, que han configurado las niñas y los niños de grado Tercero de primaria en la sede Varones, de la Institución Educativa Susana Tróchez de Vivas del municipio de Caldono, departamento del Cauca, en sus contextos educativos, es un estudio acerca de la diversidad cultural ...

  12. Cicatrización periodontal del segundo molar mandibular tras la exodoncia del tercer molar mandibular incluido

    OpenAIRE

    Inocêncio Teixeira de Faria, Ana Cristina

    2015-01-01

    La extracción quirúrgica del tercer molar (M3) puede provocar complicaciones periodontales en la cara distal del segundo molar (M2) adyacente. Se realizó un estudio clínico prospectivo a 12 meses en 25 pacientes jóvenes sanos (edad media 21 años) sometidos a 40 extracciones quirúrgicas de M3 mandibulares incluidos con elevado riesgo periodontal, con objeto de estudiar la cicatrización periodontal espontánea en la cara distal del M2. Prequirúrgicamente y a 3, 6 y 12 meses tras l...

  13. Molar Intubation for Intra Oral Swellings:Our Experience

    Directory of Open Access Journals (Sweden)

    Meenoti Potdar

    2008-01-01

    Full Text Available Molar intubation is a technique of laryngoscopy that can be used for anticipated difficult intubation in cases where standard laryngoscopy technique is difficult due to presence of any intraoral mass that anatomically hampers laryngoscopy or that bleeds on touch. This technique is very easy, reliable and rewarding but should be practiced on normal patients for easy application in actual difficult cases.

  14. Variant Root Morphology of Third Mandibular Molar in Normal and ...

    African Journals Online (AJOL)

    isaac kipyator

    2017-11-12

    Nov 12, 2017 ... Anatomy Journal of Africa. 2017. Vol 6 (3): 1052 - 1061. 1052. ORIGINAL COMMUNICATION. Variant Root Morphology of Third Mandibular Molar in Normal and. Impacted Teeth. Isaac Kipyator Bokindo1, Fawzia Butt 2,3, Francis Macigo4. 1School of Dental Sciences, University of Nairobi, Nairobi, Kenya.

  15. Densities and Excess Molar Volume for the Ternary Systems (1 ...

    African Journals Online (AJOL)

    methylimidazolium methyl sulphate ([BMIM]+[MeSO4]-) were determined. The ternary systems studied were ([BMIM]+[MeSO4]-+ nitromethane + methanol or ethanol or 1-propanol) at the temperatures (303.15 and 313.15) K. The ternary excess molar ...

  16. Ectopic (tubal) Molar Gestation: Report Of Two Cases | Abdul ...

    African Journals Online (AJOL)

    Ectopicmolar gestation is a rare event. Itsmalignant potential is similar to that of an intrauterine molar pregnancy. To document two cases of tubalmolar gestations seen over a 10-year period. Case series. Two young Nigerian undergraduates presented with features of ruptured tubal pregnancy. They had total salpingectomy ...

  17. Management of inflammatory complications in third molar surgery: A ...

    African Journals Online (AJOL)

    Results: Methods ranges from surgical closure techniques, use of drains, physical therapy and pharmacological means. Studies reviewed have shown that no single modality effectively minimizes postoperative pain, swelling and trismus without undesirable effects. Conclusion: Inflammatory complications after third molar ...

  18. SIGNS Molar tooth sign − looking beyond the obvious

    African Journals Online (AJOL)

    The molar tooth sign refers to the characteristic appearance on axial CT or MRI of enlarged and horizontally directed columnar structures on each side of the midline flanking a deep interpeduncular fossa.[1] This appearance is a result of absence or hypoplasia of the cerebellar vermis, lack of normal dorsal decussation and ...

  19. Measurement of the specific and the apparent molar volumes of ...

    African Journals Online (AJOL)

    The objective was to understand the extent to which the acids can disturb the structure of the solvent as well as affect the micellar characteristics. The specific volumes were obtained by fitting the measured viscosity data to the Einstein equation while the apparent molar volumes were obtained using the pycnometric method.

  20. Complete molar pregnancy in a 53-year-old woman

    African Journals Online (AJOL)

    Enrique

    43. SA JOURNAL OF RADIOLOGY • May 2004. CASE REPORT. Introduction. This case emphasises the role of sonography in the diagnosis of a com- plete molar pregnancy. Case report. A 53-year-old female, para 13 gravid 13, presented to the casualty department of Pretoria Academic. Hospital with a complaint of PV (per.

  1. Canal pattern in mesiobuccal root of maxillary molars of Nigerians ...

    African Journals Online (AJOL)

    planed maxillary first and second molars respectively were sectioned transversely at three different points corresponding to the cemento-enamel junction, the peak of the external outline of the furcation and the margin of the middle and apical thirds ...

  2. Impacted Mandibular Third Molars: Review of Literature and a ...

    African Journals Online (AJOL)

    Impacted tooth is a tooth which is completely or partially unerupted and is positioned against another tooth, bone or soft tissue so that its further eruption is unlikely, described according to its anatomic position.[1] The third molar impaction is occurring in about 73% of the young adults in Europe,[2] these teeth generally erupt ...

  3. Dental caries pattern of first and second permanent molars and ...

    African Journals Online (AJOL)

    Objective: The study was carried out to assess the dental caries pattern of first and second permanent molars and treatment needs among adolescent Nigerians in Lagos. Method: Examinations for dental caries and treatment needs in accordance with the criteria of the World Health Organization Basic Methods for oral ...

  4. internal root morphology in maxillary first permanent molars in a ...

    African Journals Online (AJOL)

    2011-03-03

    Mar 3, 2011 ... N. J. Muriithi, BDS (NBI), MDS, Prosthodontist, Ministry of Medical Services, Divisional of Oral Health, Rift Valley. Provincial Hospital, P. O. Box .... molars and satisfied the inclusion criteria were selected. The study was approved by the .... according to Vertucci classification. Type I. Type II. Type VII. Type VIII.

  5. Case report - Ectopic molar pregnancy: A case report | Bousfiha ...

    African Journals Online (AJOL)

    The patient was followed with weekly quantitative ;-hCG titers until three successive ;-hCG levels were negative. It is pertinent that clinicians take routine histological examination of tubal specimens in ectopic pregnancy very seriously in order to diagnose cases of ectopic molar gestations early and mount appropriate post ...

  6. Excess molar volumes and isentropic compressibilities of binary ...

    Indian Academy of Sciences (India)

    However, the large negative values of excess molar volume becomes dominant in toluene. · n-hexane mixture. Deviation in isentropic compressibility is negative over the whole range of composition in the case of all the six binary mixtures. Existence of specific intermolecular interac- tions in the mixtures has been analyzed ...

  7. ON THE MOLAR POLARIZABILITIES OF BINARY MIXTURES FROM ...

    African Journals Online (AJOL)

    TBA), lso-Propyl alcohol (IPA) and Toluene (TOL) were prepared at 298k and 1 atm. Subsequently, the densities, mole fractions and refractive indices of the mixtures and their pure components were obtained at 298k. The average molar ...

  8. Excess Molar Volume Of Binarymixtures From Iso-Propyl Alcohol ...

    African Journals Online (AJOL)

    In this work, binary mixtures from Tertiary-Butyl alcohol (TBA), Toluene (TOL) and Iso-Propyl alcohol (IPA) were prepared at 298K. The mixtures physical properties which includes densities of mixtures (ρ) and pure components (ρI) and mole fractions of components (x) were equally measured at 298K. Excess molar volumes ...

  9. internal root morphology in mandibular first permanent molars in a ...

    African Journals Online (AJOL)

    2013-11-06

    Nov 6, 2013 ... and for disinfection. Subsequently, the teeth were ... (70%, 95%, 100%) of ethyl alcohol (Scharlab S.L.. Sentmenat, Spain) for three ... Number of canals in mandibular first molars. 100. 90. 80. 70. 60. 50. 40. 30. 20. 10. 0. 3.2%.

  10. Variant Root Morphology of Third Mandibular Molar in Normal and ...

    African Journals Online (AJOL)

    isaac kipyator

    2017-11-12

    Nov 12, 2017 ... The mandibular third molar poses a challenge to dental surgeons due to it's unpredictable morphology which leads to increased difficulty during its .... Regeneration within the canal will thus be unimpeded unless obstructed by ... MATERIALS AND METHODS. A descriptive study was carried out at the.

  11. Taurodontism of deciduous and permanent molars: report of two cases.

    Science.gov (United States)

    Rao, Ashwin; Arathi, R

    2006-03-01

    Taurodontism is an aberration of teeth that lacks the constriction at the level of the CEJ characterized by elongated pulp chambers and apical displacement of bifurcation or trifurcation of the roots, giving it a rectangular shape. Its occurrence in permanent teeth is common and is quite rare in deciduous dentition. Presented in this article are two cases with taurodontism involving deciduous and permanent molars.

  12. A Rare Condition of Bimaxillary Primary Molar Taurodontism

    OpenAIRE

    Avula Jogendra Sai Sankar; Enuganti Sreedevi; Akkala Satya Gopal; Manne Naga Lakshmi

    2017-01-01

    Taurodontism is a relatively rare variance with a very low incidence in primary dentition and only a few cases have been reported in the literature. It stands a challenge when these teeth require pulp therapy. This case report illustrates the oral rehabilitation of multiple primary molars with taurodontism involving both the maxillary and mandibular arches, which is a rare occurrence.

  13. A Rare Condition of Bimaxillary Primary Molar Taurodontism.

    Science.gov (United States)

    Jogendra Sai Sankar, Avula; Sreedevi, Enuganti; Satya Gopal, Akkala; Naga Lakshmi, Manne

    2017-06-01

    Taurodontism is a relatively rare variance with a very low incidence in primary dentition and only a few cases have been reported in the literature. It stands a challenge when these teeth require pulp therapy. This case report illustrates the oral rehabilitation of multiple primary molars with taurodontism involving both the maxillary and mandibular arches, which is a rare occurrence.

  14. Temporal abscess after third molar extraction in the mandible.

    Science.gov (United States)

    de Oliveira Neto, Patrício José; de Souza Maliska, Maximiana Cristina; Sawazaki, Renato; Asprino, Luciana; de Moraes, Márcio; Moreira, Roger William Fernandes

    2012-03-01

    Dental infections resulting before or after third molar removal are complications in which the maxillofacial surgeon may have to initiate an earlier management. The severe dental infections resulting before or after this procedure is one of the few life-threatening complications in which the maxillofacial surgeon may have to initiate an earlier management. Infections involving the temporal space are rare and infrequently reported. Infections in this space have also been observed secondary to maxillary sinusitis, maxillary sinus fracture, temporomandibular arthroscopy, and drug injection, although more commonly associated to third molar infections. A 22-year-old man had undergone extraction of tooth 38 secondary to pericoronaritis by a general dentist. Physical examination of his face demonstrated severe trismus, pain, and swelling in temporal region. A CT scan showed an inflammatory area into the temporal space. He was started on IV cephalosporin, but the clinical course of the patient was not satisfactory. Incision and drainage were performed from an extraoral and intraoral approach. After discharged, the antibiotic was switched to clindamycin IO 600 mg. The retromaxillary and temporal infections are quite common after maxillary molar extractions but not after mandibular third molar, the spread mechanism of ascension must be involved with the virulence of microorganisms, but more studies are necessary to clarify this occurrence.

  15. Molar extinction coefficients of some carbohydrates in aqueous ...

    Indian Academy of Sciences (India)

    pp. 521–528. Molar extinction coefficients of some carbohydrates in aqueous solutions. K SINGH£, G K SANDHU, B S LARKa and S P SUDb. Department of Physics, Guru Nanak Dev University, Amritsar 143 005, India. aDepartment of Chemistry, Guru Nanak Dev University, Amritsar 143 005, India. bDepartment of Physics ...

  16. Molar extinction coefficients of solutions of some organic compounds

    Indian Academy of Sciences (India)

    were also fitted to third-order polynomial for all the carbohydrates of CnH2nOn type. Value of molar extinction coefficient is independent of the concentration of the solution as illustrated in figure 2. Using the present experimental data of mass attenuation coefficients of solutions and of H, C and O at different energies from ...

  17. Masticatory function following implants replacing a second molar.

    Science.gov (United States)

    Kim, Moon-Sun; Lee, Jae-Kwan; Chang, Beom-Seok; Um, Heung-Sik

    2011-04-01

    The aim of this study was to obtain objective and standardized information on masticatory function and patient satisfaction following second molar single implant therapy. Twenty adult patients, who had restored second molar single implants more than 1 month before the study, were enrolled in this study. All patients received a chewing test using peanuts before and after insertion of the implant prosthesis, with a questionnaire and visual analogue scale (VAS) to evaluate the effect of second molar single implant therapy. This study obtained standardized information on the masticatory function objectively (e.g., P, R, X(50)) before (Pre-insertion) and after insertion (Post-insertion) of the implant prosthesis. Masticatory performance (P) after insertion of the implant prosthesis significantly increased from 67.8±9.9 to 84.3±8.5% (Pmasticatory efficiency index (R) of Post-insertion is higher than that of Pre-insertion (Pfunctional point of view. These findings indicate that a second molar single implant can increase masticatory function.

  18. Inflammatory root resorption in primary molars: prevalence and associated factors.

    Science.gov (United States)

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

    2012-01-01

    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 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.

  19. Inflammatory root resorption in primary molars: prevalence and associated factors

    Directory of Open Access Journals (Sweden)

    Raquel Gonçalves Vieira-Andrade

    2012-08-01

    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.

  20. Permanent versus temporary restorations after emergency pulpotomies in primary molars.

    Science.gov (United States)

    Guelmann, Marcio; Fair, Jodi; Bimstein, Enrique

    2005-01-01

    The purpose of this retrospective study was to determine if immediate placement of a stainless steel crown (SSC) after emergency pulpotomies in primary molars would result in a better outcome when compared to different temporary restorations. Records of 94 emergency pulpotomies in primary molars performed at a university pediatric graduate dental clinic between July 2001 and June 2004 were analyzed. Inclusion criteria included: (1) teeth with a positive history of spontaneous or elicited pain; (2) deep caries with close approximation to the pulp; (3) absence of clinical and radiographic signs of pulpal degeneration; (4) abnormal mobility; or (5) swelling. Pulpotomized teeth were temporarily restored with a zinc oxide eugenol-based temporary restoration (IRM) covered with Ketac Molar or with a permanent restoration (SSC). The time interval between emergency and definitive treatment or recall, age, gender, tooth type, and arch were the variables analyzed in the study. Success was determined by record (progress notes and radiographs) verification of SSC placement in case of a temporary restoration and by confirmation of crown presence during recall exam. Data from emergency pulpotomies restored only with IRM was added to the study and included in the statistical analysis. Superior clinical success was obtained when emergency pulpotomies were restored with SSC (86%) when compared to IRM only (61%) or IRM and Ketac Molar combined (77%). Statistical significance was obtained in favor of SSC when survival analysis was performed (P.05). Immediate placement of an SSC tended to improve the chances for success when emergency pulpotomies are performed.

  1. Impacted third molar transplantation on the malpracticed extraction ...

    African Journals Online (AJOL)

    ... followed after transplant for a four-year period with the best satisfaction. Funding: A grant of the Korean Health Technology R&D Project, Ministry of Health & Welfare, Republic of Korea. (HI15C0689). Keywords: Autotransplantation, Endodontic treatment, Impacted third molar, Malpracticed extraction, Maxillofacial specialty ...

  2. Evaluation of radiographic features of embedded primary molar ...

    African Journals Online (AJOL)

    2014-05-20

    May 20, 2014 ... should be alert to this possibility and should perform a thorough clinical and radiographic examination. If these primary molar roots are allowed to remain in the oral cavity, periodontist should be aware of their presence and modify the treatment plan accordingly.[13]. Differential diagnosis of retained roots ...

  3. excess molar volumes, and refractive index of binary mixtures of ...

    African Journals Online (AJOL)

    Preferred Customer

    product of biodiesel and used in many wide industrial applications. Glycerol can be obtained by ... binary mixtures of glycerol + water and glycerol + methanol covering the whole composition range and at 298.15 K .... 114 the mixture. Excess molar volumes on mixing of the binary systems were fitted to Redlich–. Kister [12 ...

  4. Miniscrew-supported coil spring for molar uprighting: description

    Directory of Open Access Journals (Sweden)

    Antônio Carlos de Oliveira Ruellas

    2013-02-01

    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.

  5. Risk for molars without antagonists: opinion of dental practitioners in ...

    African Journals Online (AJOL)

    Results: The great majority of practitioners (92%) believed that unopposed molars overerupt markedly and majority (87%) recommends replacement of the missing antagonist with partial dentures while 13% preferred to wait and see. The main reasons for the suggested treatment were (1) to prevent overeruption of ...

  6. Geometric morphometric analysis of the molars in three species of ...

    African Journals Online (AJOL)

    The relatively new technique of outline-based geometric morphometrics was applied in a study of the variation in the shape of the upper and lower molars among 122 mice, belonging to one species from Iran (Mus musculus) and two species from Europe (Mus macedonicus, Mus spicilegus). Differentiation of specimens ...

  7. Antibiotic prophylaxis in third molar surgery: a review

    NARCIS (Netherlands)

    Oomens, M.A.E.; Forouzanfar, T.

    2012-01-01

    Objective: Controversy exists about the efficacy of antibiotic prophylaxis in preventing complications after lower third molar surgery. For evidence-based recommendation, a review was performed on clinical trials reporting the use of antibiotic prophylaxis compared with no treatment or placebo with

  8. Antibiotic prophylaxis in third molar surgery: a review

    NARCIS (Netherlands)

    Oomens, M.A.E.; Forouzanfar, T.

    2012-01-01

    Objective Controversy exists about the efficacy of antibiotic prophylaxis in preventing complications after lower third molar surgery. For evidence-based recommendation, a review was performed on clinical trials reporting the use of antibiotic prophylaxis compared with no treatment or placebo with

  9. Acute Pericoronitis And The Position Of The Mandibular Third Molar ...

    African Journals Online (AJOL)

    This study evaluates the relationship of acute pericoronitis to the position of the mandibular third molar in Nigerians. One hundred and thirty-two cases of acute pericoronitis seen over a period of 6 months at the state Dental Centre, Kaduna were studied. The tooth with the highest risk for acute pericoronitis was found to be ...

  10. Update in the technique of third molar surgery | Obiechina | Annals ...

    African Journals Online (AJOL)

    No Abstract. Keywords: third molar, impaction; preoperative assessment; surgery. Annals of Ibadan Postgraduate Medicine Vol. 1 (1) 2003: pp. 40-45. Full Text: EMAIL FREE FULL TEXT EMAIL FREE FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT · http://dx.doi.org/10.4314/aipm.v1i1.39100 · AJOL African ...

  11. Prevalence Of Molar Incisor Hypomineralisation In Six To Eight Year ...

    African Journals Online (AJOL)

    Objective: To determine the prevalence of molar incisor hypomineralization (MIH) and any associated causes of MIH in children from two rural divisions in Kenya. Design: Prospective cross-sectional study. Setting: Seventeen primary schools in Matungulu and Kangundo divisions of Machakos district in Kenya. Subjects: All ...

  12. Unilateral maxillary molar distalization with zygoma-gear appliance.

    Science.gov (United States)

    Kilkis, Dogan; Bayram, Mehmet; Celikoglu, Mevlut; Nur, Metin

    2012-08-01

    The aim of this study was to present the orthodontic treatment of a 15-year-old boy with a unilateral maxillary molar distalization system, called the zygoma-gear appliance. It consisted of a zygomatic anchorage miniplate, an inner bow, and a Sentalloy closed coil spring (GAC International, Bohemia, NY). A distalizing force of 350 g was used during the distalization period. The unilateral Class II malocclusion was corrected in 5 months with the zygoma-gear appliance. The maxillary left first molar showed distalization of 4 mm with an inclination of 3°. The maxillary premolars moved distally with the help of the transseptal fibers. In addition, there were slight decreases in overjet (-0.5 mm) and maxillary incisor inclination (-1°), indicating no anchorage loss from the zygoma-gear appliance. Preadjusted fixed appliances (0.022 × 0.028-in, MBT system; 3M Unitek, Monrovia, Calif) were placed in both arches to achieve leveling and alignment. After 14 months of unilateral distalization with the zygoma-gear appliance and fixed appliances, Class I molar and canine relationships were established with satisfactory interdigitation of the posterior teeth. Acceptable overjet and overbite were also achieved. This article shows that this new system, the zygoma-gear appliance, can be used for unilateral maxillary molar distalization without anchorage loss. Copyright © 2012 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.

  13. [The relation of pericoronitis to the position of the mandibular third molar].

    Science.gov (United States)

    Lee, D K; Kim, B J

    1989-02-01

    Pericoronitis is the most commonly encountered pathologic condition involving the mandibular third molar. Because of the dangers associated with mandibular third molar pericoronitis, prophylactic extraction of third molar at high risk has been recommended. We studied 411 patients with mandibular third molar pericoronitis by clinical symptoms and radiographic measurement of mandibular third molar height, wideth and angulation. The results were as follows: 1. Mandibular third molar pericoronitis is frequently seen in third decade and there are no sexual difference significantely. 2. In inflammatory type of mandibular third molar pericoronitis, chronic pericoronitis occured more frequently than acute type. 3. In relation to angulation and height, mandibular third molar most likely to be afflicted with pericoronitis is vertical eruption at occlusal plane of the second molar. 4. In relation to angulation and width, it appears that the position of the mandibular third molar most likely to be afflicted with pericoronitis is in a vertically erupted tooth of which the space between the ramus and the distal side of the second molar is less than the mesiodistal diameter of crown. (Class II). 5. In relation to height and width, it appears that the position of the mandibular third molar most likely to be afflicted with pericoronitis is class II width (described above)at occlusal plane of the second molar.

  14. Influence of monomer and crosslinker molar ratio on the swelling behaviour of thermosensitive hydrogels

    National Research Council Canada - National Science Library

    Ilić-Stojanović Snežana S; Nikolić Ljubiša; Nikolić Vesna; Stanković Mihajlo; Stamenković Jakov; Mladenović-Ranisavljević Ivana; Petrović Slobodan

    2012-01-01

    ... of monomer and crosslinker molar ratios on the swelling behaviour was investigated. Synthesis of thermosensitive hydrogel based on N-isopropylacrylamide was carried out with the molar ratios of 5, 10, 15 and 20 mol...

  15. Molar Uprighting Using Mini-Screws after Distalization by the Pendulum Appliance: A Case Report

    Directory of Open Access Journals (Sweden)

    Amir Moradi

    2013-12-01

    Full Text Available A 16-year-old Class II female patient was treated without tooth extraction. The upper first molars were distalized by the Pendulum appliance. After six months, the molars tipped significantly to the distal. To correct this side effect, we decided to upright the molars using skeletal anchorage. On each side, a mini-screw was inserted between first and second premolars in the buccal cortical plate. An auxiliary spring was placed between the mini-screw head and the molar buccal tube. The resultant moment made the first molar upright. In addition, the side effects of this mechanic, i.e. molar intrusion and molar buccal tipping, counteract the extrusion and medial movement caused by the Pendulum Appliance. The aim of this case report was to present an innovative method for molar uprighting using skeletal anchorage.

  16. Clinical outcomes for primary molars treated by different types of pulpotomy: A retrospective cohort study

    Directory of Open Access Journals (Sweden)

    Heng-Yeh Kuo

    2018-01-01

    Conclusion: Operators and final restorations are confounding factors for determining the success rate of primary molars treated by pulpotomy. Pulpotomy with diode laser, sodium hypochlorite, or no medication are all acceptable treatments of choice for coronally infected primary molars.

  17. Outcomes of intentionally replanted molars according to preoperative locations of periapical lesions and the teeth

    Directory of Open Access Journals (Sweden)

    WooCheol Lee

    2012-06-01

    Conclusions: Within the limitations of this study, IR of mandibular molars seemed to provide a higher success rate than that for maxillary molars, regardless of the presence of preoperative periapical lesions.

  18. C-reactive protein a better indicator of inflammation after third molar ...

    African Journals Online (AJOL)

    operative pain and pre-operative levels of C-reactive and post-operative pain and swelling in impacted third molar surgery. Materials and Methods: In this prospective study subjects were patients indicated for mandibular third molar extraction.

  19. Are there any differences between first and second primary molar pulpectomy prognoses? A retrospective clinical study.

    Science.gov (United States)

    Mendoza-Mendoza, A; Caleza-Jiménez, C; Solano-Mendoza, B; Iglesias-Linares, A

    2017-03-01

    To determine if there are any significant differences between the prognoses of pulpectomies done on first and second primary molars of the upper and lower dental arch. Study Design: The clinical study included 55 children who had undergone 86 pulpectomy treatments, 41 on the first molars and 45 on the second molars. The root canal filling material consisted of a paste based on Walkhoff formula, containing Kri-1, calcium hydroxide and meta-cresol formaldehyde. The same clinician carried out all pulpectomies. After the analysis there were a total of 7 treatment failures (3 in the upper arch and 4 in the lower). Four of the 7 failures were first primary molars and three were second primary molars. There were no significant differences in the prognoses of the different kinds of primary molars. The anatomy of the primary molars changes considerably. Significant differences were not observed in the prognosis of different types of primary molars after pulpectomy.

  20. Immediate changes in the mandibular dentition after maxillary molar distalization using headgear

    OpenAIRE

    Kang, Sung-Ja; Kim, Hyun-Hee; Hwang, Hyeon-Shik; Lee, Kyung-Min

    2017-01-01

    The purpose of this study was to investigate immediate changes in the mandibular dentition after maxillary molar distalization using headgear in non-growing patients. Sixteen patients (mean age, 18.9 ? 2.0 years) with Class II molar relationship and crowding were included in the present study. To correct the molar relationship, headgear was used for maxillary molar distalization. Cone-beam computed tomography-generated half-cephalograms (CG Cephs) and dental casts were used to evaluate dental...

  1. A comparative study between lip bumper and headgear as maxillary molar retainers following distalization.

    Science.gov (United States)

    Silva, Rafael Games Corrêa; Kaieda, Armando Koichiro; Paranhos, Luiz Renato; Angelieri, Fernanda; Torres, Fernando César; Scanavini, Marco Antônio

    2012-01-01

    Abstract: There are many appliances that can be used to correct molar relationship, achieving upper molar distalization, in Class II malocclusion. This research aimed to study the dental effects promoted by lip bumper to retain maxillary molars that had previously been distalized using a Cetlin appliance in conjunction with headgear.

  2. CAD/CAM Preparation Design Effects on Endodontically Treated and Restored Molars

    Science.gov (United States)

    2016-05-24

    CAD /CAM Preparation Design Effects on Endodontically Treated and Restored Molars Aaron T. Krance CAD /CAM Preparation Design Effect on...manuscript entitled: CAD /CAM Preparation Design Effect on Endodonticallv Treated and Restored Molars is appropriately acknowledged and beyond brief...by a CAD /CAM technique on endodontically treated molars restored with the endocrown method versus ceramic full coverage based on amalgam cores with

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

    Science.gov (United States)

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

  4. Correlation between chronological age and third molar developmental stages in an Iranian population (Demirjian method

    Directory of Open Access Journals (Sweden)

    Aria Khosronejad

    2017-01-01

    Conclusion: Development of third molar might complete after the age 22. Iranian individuals with third molars at the G and H stages are likely above 18 while those at E and F are likely below 18. Pace of molar development differs for jaws, but intergender differences are open to further investigations.

  5. The origin of the lower fourth molar in canids, inferred by individual variation

    Directory of Open Access Journals (Sweden)

    Masakazu Asahara

    2016-11-01

    Full Text Available Background An increase in tooth number is an exception during mammalian evolution. The acquisition of the lower fourth molar in the bat-eared fox (Otocyon megalotis, Canidae, Carnivora, Mammalia is one example; however, its developmental origin is not clear. In some canids (Canidae, individual variation exist as supernumerary molar M4. This study focuses on the acquisition of the lower fourth molar in canids and proposes that the inhibitory cascade model can explain its origin. Methods Occlusal view projected area of lower molars was determined from 740 mandibles obtained from Canis latrans, Nyctereutes procyonoides, and Urocyon cinereoargenteus museum specimens. For each molar, relative sizes of molars (M2/M1 and M3/M1 scores affected by inhibition/activation dynamics during development, were compared between individuals with and without supernumerary molar (M4. Results Possession of a supernumerary molar was associated with significantly larger M2/M1 score in Canis latrans, M3/M1 score in Nyctereutes procyonoides, and M2/M1 and M3/M1 scores in Urocyon cinereoargenteus compared to individuals of these species that lacked supernumerary molars. Discussion We propose that, in canids, the supernumerary fourth molar is attributable to reduced inhibition and greater activation during molar development. In the bat-eared fox, altered inhibition and activation dynamics of dental development during omnivorous-insectivorous adaptation may be a contributing factor in the origin of the lower fourth molar.

  6. [Etiological problems of anterior tooth crowding: the role of the third molar].

    Science.gov (United States)

    Minervini, G; Posillico, N

    1990-01-01

    The authors discussed about the extraction or not of the 3 degrees molar either to prevent or correct the dental crowding. They state that, since there is no definitive evidence of the real importance of the 3 degrees molar in creating dental crowding, it is not possible to perform without discrimination 3 degrees molar germectomy nor the extraction for prevention.

  7. Photoelastic stress analysis of mandibular molars moved distally with the skeletal anchorage system.

    Science.gov (United States)

    Nakamura, Atsushi; Teratani, Tsuyoshi; Itoh, Hidemi; Sugawara, Junji; Ishikawa, Hiroyuki

    2007-11-01

    The purpose of this study was to analyze photoelastically the stress distribution around teeth in the simulated distal movement of mandibular molars with the skeletal anchorage system. Two types of the photoelastic mandibular dentition models were used, 1 before and 1 after distal movement of the second molar. The experiment was performed with 3 forms of traction--first-molar single traction, second-molar single traction, and simultaneous first- and second-molar traction. The direction of traction was set parallel to the occlusal plane and at an angle of 30 degrees downward to the occlusal plane. In the first-molar single traction model, extremely high stress was generated around the first molar with traction parallel to the occlusal plane. With the traction 30 degrees downward to the occlusal plane, all models showed the stress around the molars extended distally and downward. Simultaneous traction of the first and second molars might be preferable to the sequential traction of each molar to prevent the unfavorable distal tipping of the first molar. Regardless of whether simultaneous or sequential traction is used, the downward traction to the occlusal plane seems to induce intrusion of the molars as well as their distal movement.

  8. Distance of mandibular foramen from 3 rd molar tooth in dry adult ...

    African Journals Online (AJOL)

    The aim of this study was to determine the distance of MF from 3rd molar tooth in both genders. Seventy dry adult mandible were included in this study. Mandible having 3rd molar tooth was selected for the study. Distance of MF from mid point of 3rd molar tooth to anterior margin of MF was measured with Vernier caliper.

  9. Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans.

    Science.gov (United States)

    Shen, Bing; Dong, Lin; Xiao, Shuhai; Lang, Xianguo; Huang, Kangjun; Peng, Yongbo; Zhou, Chuanming; Ke, Shan; Liu, Pengju

    2016-01-07

    Molar tooth structures are ptygmatically folded and microspar-filled structures common in early- and mid-Proterozoic (∼2,500-750 million years ago, Ma) subtidal successions, but extremely rare in rocks Proterozoic continental margins. In this convergence zone, methyl sulphides served as a non-competitive substrate supporting methane generation and methanethiol inhibited anaerobic oxidation of methane, resulting in the buildup of CH4, formation of degassing cracks in sediments and an increase in the benthic methane flux from sediments. Precipitation of crack-filling microspar was driven by methanogenesis-related alkalinity accumulation. Deep ocean ventilation and oxygenation around 750 Ma brought molar tooth structures to an end.

  10. The Hall Technique for managing carious primary molars.

    Science.gov (United States)

    Innes, Nicola; Evans, Dafydd; Hall, Norna

    2009-10-01

    The Hall Technique, a method of managing carious primary molars effectively with preformed metal crowns, without the use of local anaesthesia, caries removal or tooth preparation of any kind, is described.The technique is illustrated with a case report.The evidence underpinning the technique is discussed, along with indications and contra-indications for its use, and details of where clinicians can obtain further information on the technique if they are considering using it. Research evidence has indicated that the Hall Technique is effective in managing dental caries in primary molar teeth when used by General Dental Practitioners, and is preferred by them, their child patients and the children's parents to conventional restorative methods for these teeth.

  11. Periodontal pathogens in erupting third molars of periodontally healthy subjects.

    Science.gov (United States)

    Rajasuo, A; Sihvonen, O J; Peltola, M; Meurman, J H

    2007-09-01

    The presence of Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, Prevotella intermedia and Tannerella forsythensis in bacteriologic samples of 5-7-mm deep mandibular third-molar pericoronal pockets was analysed by polymerase chain reaction, to test the hypothesis that these sites would harbour the bacteria. The patients were periodontally healthy 20-year-old Finnish male conscripts. Sixteen had acute pericoronitis, 28 chronic pericoronitis, and 15 were symptom-free controls. A. actinomycetemcomitans was detected in only 7% of the samples from chronic pericoronitis cases, whereas P. gingivalis was positive in 20% of the symptom-free versus 69% (P = 0.018) of the acute and 57% (P = 0.044) of the chronic cases. The percentages for P. intermedia were 93, 94 and 93%, and for T. forsythensis 47, 63 and 57%, respectively. These results confirm that, apart from A. actinomycetemcomitans, periodontopathogens are common in third-molar sites in periodontally healthy individuals.

  12. Endodontic and post-endodontic management of a fused molar

    Directory of Open Access Journals (Sweden)

    Ruchi Gupta

    2013-01-01

    Full Text Available Treatment of fused teeth needs special care and attention to the bizarre anatomy. This paper describes root canal treatment of a fused carious tooth presenting with apical periodontitis. It is a rare case of fusion of the mandibular second molar with a paramolar. There is no literature regarding placement of crown over endodontically treated fused teeth. In this case, the fused teeth were endodontically treated and restored by a porcelain fused to metal crown.

  13. Indirect composite onlay restorations in primary molars: a clinical report.

    Science.gov (United States)

    Villalta, Patricia; Oliveira, Luciana Butini; Imparato, José Carlos Pettorossi; Rodrigues, Célia Regina Martins Delgado

    2006-01-01

    The authors describe a clinical case of oral rehabilitation, in a 4-year-old patient, using indirect composite onlay restorations. Eight severely decayed primnary molars were restored. The clinical findings after 4 years demonstrated the efficiency of the technique as well as its indication in extensive restorations in Pediatric Dentistry, reestablishing function and aesthetics of these primary teeth. The indirect composite onlay restorations seem to wear at rate compatible with primary tooth wear and maintain a smooth, continuous anatomic form.

  14. Prediction of postoperative pain after mandibular third molar surgery

    DEFF Research Database (Denmark)

    Rudin, Asa; Eriksson, Lars; Liedholm, Rolf

    2010-01-01

    To evaluate the predictive potential of preoperative psychological and psychophysiological variables in estimating severity of postoperative pain following mandibular third molar surgery (MTMS). Methods: Following ethical committee approval and informed consent, 40 consecutive patients scheduled...... for MTMS were included. Preoperative psychometric indicators of anxiety, depression, and vulnerability were evaluated by patient questionnaires. Thermal thresholds and heat pain perception (1 second phasic stimuli: 44 degrees C to 48 degrees C) were evaluated with quantitative sensory testing techniques...

  15. Fate of the molar dental lamina in the monophyodont mouse.

    Directory of Open Access Journals (Sweden)

    Hana Dosedělová

    Full Text Available The successional dental lamina (SDL plays an essential role in the development of replacement teeth in diphyodont and polyphyodont animals. A morphologically similar structure, the rudimental successional dental lamina (RSDL, has been described in monophyodont (only one tooth generation lizards on the lingual side of the developing functional tooth. This rudimentary lamina regresses, which has been proposed to play a role in preventing the formation of future generations of teeth. A similar rudimentary lingual structure has been reported associated with the first molar in the monophyodont mouse, and we show that this structure is common to all murine molars. Intriguingly, a lingual lamina is also observed on the non-replacing molars of other diphyodont mammals (pig and hedgehog, initially appearing very similar to the successional dental lamina on the replacing teeth. We have analyzed the morphological as well as ultrastructural changes that occur during the development and loss of this molar lamina in the mouse, from its initiation at late embryonic stages to its disappearance at postnatal stages. We show that loss appears to be driven by a reduction in cell proliferation, down-regulation of the progenitor marker Sox2, with only a small number of cells undergoing programmed cell death. The lingual lamina was associated with the dental stalk, a short epithelial connection between the tooth germ and the oral epithelium. The dental stalk remained in contact with the oral epithelium throughout tooth development up to eruption when connective tissue and numerous capillaries progressively invaded the dental stalk. The buccal side of the dental stalk underwent keratinisation and became part of the gingival epithelium, while most of the lingual cells underwent programmed cell death and the tissue directly above the erupting tooth was shed into the oral cavity.

  16. Identification of Protocadherin 18-like Protein in Horse Molar Cementum

    OpenAIRE

    深澤, 加與子; 佐原, 紀行; 森山, 敬太; 久野, 知子; 藤井, 慈貴; 音琴, 淳一; 太田, 紀雄; 宇田川, 信之; 矢ケ﨑, 裕; 小澤, 英浩

    2005-01-01

    Cementum plays an important role in tooth regeneration; however, the organization system has not yet been clarified. We have studied odontoclastic resorption in human deciduous teeth, and found that the cementum completely covers the enamel tissues of horse molar teeth. In order to study the regeneration system ofcementum, an EDTA soluble fraction extracted from horse cementum was analyzed. The 30 kDa protein was isolated from the EDTA fraction of horse cementum by hydroxyapatite chromatograp...

  17. Radicular cyst in deciduous maxillary molars: a rarity.

    Science.gov (United States)

    Shetty, Shibani; Angadi, Punnya V; Rekha, K

    2010-03-01

    Radicular cyst arising from deciduous teeth is exceedingly rare accounting for radicular cysts. A total of 122 cases have been reported to date in the English language literature. We present a rare case of a radicular cyst associated with a decayed deciduous maxillary molar tooth without any history of prior pulp therapy. Our aim is to emphasize the recognition of inflammatory radicular lesions associated with deciduous teeth which may adversely impact underlying permanent successor.

  18. Nutrient Composition and Phytate-Zinc Molar Ratio of Prepared ...

    African Journals Online (AJOL)

    High calcium foods include kulikuli (871.08mg/100g), akara (296.13mg/100g) and fufu a wet cassava meal (255.31mg/100g). kulikuli was also high in iron and zinc ... Phytate-zinc molar ratios of the prepared dishes were <10 indicating that the bioavailability of zinc consumed in these rural dishes is not likely to be impaired.

  19. Anxiety before extraction of impacted lower third molars.

    Science.gov (United States)

    Tarazona, Beatriz; Tarazona-Álvarez, Pablo; Peñarrocha-Oltra, David; Rojo-Moreno, Juan; Peñarrocha-Diago, Maria

    2015-03-01

    Assess levels of trait anxiety, state anxiety and dental anxiety before extraction of lower third molars and check the correlation and reliability of the scales used for the measurement of preoperative anxiety. A prospective study of patients treated with extraction of a lower third molar between September 2010 to December 2010 was carried out. A total of 125 patients were included in the study. All of them were patients of the Oral Surgery and Implantology Department (Valencia University Medical and Dental School, Valencia, Spain). Before surgery, patients had to complete a preoperative protocol with 4 scales: the STAI-T (State-Trait Anxiety Inventory-Trait) for measuring trait anxiety, the STAI-S (State-Trait Anxiety Inventory-State) for measuring state anxiety, and DAS (Dental anxiety Scale of N. Corah) and APAIS (Amsterdam Preoperative anxiety and Information Scale) for measuring dental anxiety. Patients undergoing extractions of an impacted lower third molar showed low levels of trait anxiety and moderate levels of state anxiety and dental anxiety. Higher levels of trait anxiety were obtained for older patients. Women had higher mean levels of dental anxiety and state anxiety that men with a statistically significant difference in STAI-S scales, DAS, and APAIS. Patients with higher trait anxiety and state anxiety showed higher levels of dental anxiety. A significant correlation (p ≤ 0.01) (p = 0.00) was found between the four scales used to measure anxiety. The scale showed higher correlation was STAI-S scale. The 4 scales showed high reliability (α of C.> 0.80). Patients with highest levels of trait anxiety and state anxiety, had more dental anxiety. The STAI-T, STAI-S, DAS and APAIS scales provided useful information about anxiety before the extraction of lower impacted third molars. The STAI-S is the scale with highest correlation and reliability.

  20. Diagnosis of Proximal Caries in Primary Molars with DIAGNOdent pen

    OpenAIRE

    Ermler, Romy

    2010-01-01

    Proximal surfaces, together with fissures, are the areas where most primary caries occur. Due to the anatomy of the deciduous molars, proximal caries cannot be detected at an early stage in crowded teeth by simply using a mirror and probe. Therefore, additional methods to find early proximal caries have to be used. KaVo uses laser fluorescence to detect caries. Originally, the DIAGNOdent devices were able to detect only occlusal caries (56, 61, 62, 65, 66). New results are now also available ...

  1. Interfacial Properties of Methylcelluloses: The Influence of Molar Mass

    Directory of Open Access Journals (Sweden)

    Pauline L. Nasatto

    2014-12-01

    Full Text Available The interfacial interactions of four methylcelluloses having the same average degree of substitution and distribution of methyl groups, but different molar masses, are studied at ambient temperature and at very low polymer concentrations. Firstly, the surface tension σ at the water/air interface is determined for the progressive addition of methylcellulose up to 100 mg/L; σ starts to decrease over 1 mg/L up to the critical aggregation concentration (CAC at 10 mg/L. The curves describing the influence of polymer concentration on σ are independent of the molar mass at equilibrium. Secondly, the adsorption of methylcellulose on silica particles is estimated from ζ-potential measurements. The data are interpreted in terms of an increase of the adsorbed layer thickness at the interface when the molar mass of methylcellulose increases. It is concluded that methylcellulose is adsorbed, forming trains and loops at the interface based on the equilibrium between surface free energy and solvent quality.

  2. 3-D diagnosis-assisted management of anomalous mandibular molar

    Directory of Open Access Journals (Sweden)

    Neelam Mittal

    2012-01-01

    Full Text Available This case report describes the successful non-surgical endodontic management of carious exposed three-rooted mandibular molar with four root canals detected on the pre-operative radiograph taken with 20 degrees mesial angulation and confirmed with a 64-slice helical computed tomography scan-assisted 3-D-reconstructed images. Access cavity shape was modified to locate the extra canal with respect to the distolingual root in the left mandibular first molar. Copious irrigation was accomplished with 5.25% sodium hypochlorite and 17% EDTA. Biomechanical preparation was done using protapers. Calcium hydroxide dressing was done for 1 week. The tooth was obturated using gutta percha and AH 26 root canal sealer, and it was permanently restored with composite. Clinical examination on follow-up visits revealed no sensitivity to percussion and palpation in the left mandibular first molar. Thorough knowledge of root canal variations and use of advanced diagnostic modalities lead to successful non-surgical management of the complex cases.

  3. Posterior Open Bite Due to Failure of Maxillary Molar Eruption.

    Science.gov (United States)

    Yasumura, Toshihiko; Sueishi, Kenji

    2016-01-01

    Posterior open bite can cause problems with occlusion. It arises from systemic or local factors such as physical or functional interference, ankylosis, and failure of eruption. Primary failure of eruption (PFE) is a rare condition that is difficult to differentiate from ankylosis and requires complex treatment strategies. Here we report a 12-year-old girl who was referred to our hospital by her dentist for re-evaluation of eruption failure of the left maxillary secondary premolar and first and second molars with congenitally missing maxillary lateral teeth. The maxillary first molar was extracted for a therapeutic diagnosis. The left maxillary secondary premolar and second molar reacted well to subsequent orthodontic treatment. Auto-transplantation of the mandibular premolar to the maxil-lary arch was carried out to achieve optimal overjet, overbite, and occlusion. The active treatment period spanned 4 years and 1 month. Assessment of the patient's medical and dental history, prior trauma, and clinical conditions resulted in a therapeutic diagnosis of PFE. Satisfactory orthodontic treatment results were achieved.

  4. Molar macrowear reveals Neanderthal eco-geographic dietary variation.

    Directory of Open Access Journals (Sweden)

    Luca Fiorenza

    Full Text Available Neanderthal diets are reported to be based mainly on the consumption of large and medium sized herbivores, while the exploitation of other food types including plants has also been demonstrated. Though some studies conclude that early Homo sapiens were active hunters, the analyses of faunal assemblages, stone tool technologies and stable isotopic studies indicate that they exploited broader dietary resources than Neanderthals. Whereas previous studies assume taxon-specific dietary specializations, we suggest here that the diet of both Neanderthals and early Homo sapiens is determined by ecological conditions. We analyzed molar wear patterns using occlusal fingerprint analysis derived from optical 3D topometry. Molar macrowear accumulates during the lifespan of an individual and thus reflects diet over long periods. Neanderthal and early Homo sapiens maxillary molar macrowear indicates strong eco-geographic dietary variation independent of taxonomic affinities. Based on comparisons with modern hunter-gatherer populations with known diets, Neanderthals as well as early Homo sapiens show high dietary variability in Mediterranean evergreen habitats but a more restricted diet in upper latitude steppe/coniferous forest environments, suggesting a significant consumption of high protein meat resources.

  5. A Neanderthal lower molar from Stajnia Cave, Poland.

    Science.gov (United States)

    Dąbrowski, P; Nowaczewska, W; Stringer, C B; Compton, T; Kruszyński, R; Nadachowski, A; Stefaniak, K; Urbanowski, M

    2013-04-01

    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. Copyright © 2013 Elsevier GmbH. All rights reserved.

  6. Molar Macrowear Reveals Neanderthal Eco-Geographic Dietary Variation

    Science.gov (United States)

    Fiorenza, Luca; Benazzi, Stefano; Tausch, Jeremy; Kullmer, Ottmar; Bromage, Timothy G.; Schrenk, Friedemann

    2011-01-01

    Neanderthal diets are reported to be based mainly on the consumption of large and medium sized herbivores, while the exploitation of other food types including plants has also been demonstrated. Though some studies conclude that early Homo sapiens were active hunters, the analyses of faunal assemblages, stone tool technologies and stable isotopic studies indicate that they exploited broader dietary resources than Neanderthals. Whereas previous studies assume taxon-specific dietary specializations, we suggest here that the diet of both Neanderthals and early Homo sapiens is determined by ecological conditions. We analyzed molar wear patterns using occlusal fingerprint analysis derived from optical 3D topometry. Molar macrowear accumulates during the lifespan of an individual and thus reflects diet over long periods. Neanderthal and early Homo sapiens maxillary molar macrowear indicates strong eco-geographic dietary variation independent of taxonomic affinities. Based on comparisons with modern hunter-gatherer populations with known diets, Neanderthals as well as early Homo sapiens show high dietary variability in Mediterranean evergreen habitats but a more restricted diet in upper latitude steppe/coniferous forest environments, suggesting a significant consumption of high protein meat resources. PMID:21445243

  7. Variable permanent mandibular first molar: Review of literature

    Science.gov (United States)

    Ballullaya, Srinidhi V; Vemuri, Sayesh; Kumar, Pabbati Ravi

    2013-01-01

    Introduction: The success of root canal therapy depends on the locations of all the canals, thourough debridement and proper sealing. At times the clinicians are challenged with variations in morphology of root canal. This review article attempts to list out all the variations of permanent mandibular first molar published so for in the literature. Materials and Methods: An exhaustive search was undertaken using PUBMED database to identify published literature from 1900 to 2010 relating to the root canal morphology of permanent first molar by using key words. The selected artcles were obtained and reviewed. Results: Total ninty seven articles were selected out of which 50 were original article and forty seven were case reports. The incidence of third canal in mesial root was 0.95% to 15%. The incidence of three rooted mandibular first molar was 3% to 33%. Only ninety cases reported with c-shape canal configuration. Incidence of Taurodintism without congenital disorder was very rare. Conclusion: The root canal treatment requires proper knowlegde of variations in root canal morphology in order to recognise, disinfect and seal all portal of exit. This can be accomplished with proper diagnosis using newer modes, modification in access preparation, use of operating microscope, enhanced methods of disinfecting and sealing of all canals. PMID:23716959

  8. Changes in maxillary molar pulp blood flow during orthodontic intrusion.

    Science.gov (United States)

    Sabuncuoglu, Fidan Alakus; Ersahan, Seyda

    2014-11-01

    The aim of this prospective study was to evaluate the effects of maxillary first molar intrusion on pulpal blood flow (PBF) in humans as recorded by laser Doppler flowmetry (LDF). Maxillary first molars of 16 participants were divided into two groups. In the study group, 20 teeth in 10 participants were subjected to an intrusive force of 100 g delivered from mini-implants for 6 months. A control group of 6 subjects (12 teeth) received no orthodontic treatment. LDF measurements were recorded at baseline and at 3 days, 3 weeks, 3 months and 6 months during intrusion. Data was analysed using the Wilcoxon Signed Rank and Mann-Whitney U tests, with a level of p intrusion with mini-implants and an applied force of 100 g, blood vessel function was maintained throughout intrusion, as indicated by LDF measurements of PBF, which tended to return to baseline values by the end of the observation period. These results highlight the changes that can occur in molar vascularity, especially during six months of intrusion.

  9. The Use of Narrow Diameter Implants in the Molar Area

    Directory of Open Access Journals (Sweden)

    M. Saad

    2016-01-01

    Full Text Available Implant rehabilitations in the posterior jaw are influenced by many factors such as the condition of the remaining teeth, the force factors related to the patient, the quality of the bone, the maintenance of the hygiene, the limited bone height, the type and extent of edentulism, and the nature of the opposing arch. The gold standard is to place a regular diameter implant (>3.7 mm or a wide one to replace every missing molar. Unfortunately, due to horizontal bone resorption, this option is not possible without lateral bone augmentation. In this situation, narrow diameter implant (NDI < 3.5 mm could be the alternative to lateral bone augmentation procedures. This paper presents a clinical study where NDIs were used for the replacement of missing molars. They were followed up to 11 years. Special considerations were observed and many parameters were evaluated. NDI could be used to replace missing molar in case of moderate horizontal bone resorption if strict guidelines are respected. Yet, future controlled prospective clinical trials are required to admit their use as scientific evidence.

  10. Third molar-related morbidity in deployed Service personnel.

    Science.gov (United States)

    Combes, J; McColl, E; Cross, B; McCormick, R J

    2010-08-28

    The minimisation of disease and non-battle injury (DNBI) is essential for maintaining efficiency in a fighting force. Third molar-related morbidity is a common cause of DNBI. With extended lines of communication in current military deployments, travelling for dental care is often subject to significant danger. Military dental officers in Afghanistan and Iraq recorded data on patients presenting with third molar pathology. Related previous history was obtained from the individual and from the military dental records. Three hundred and three individuals presented during the 23 month study period; 27.7% were unable to access care immediately, most commonly citing work pressure or lack of safe transport. Of those needing to travel, 70% were moved by helicopter. Pericoronitis was diagnosed in 84.4% of cases, 20.6% of these teeth being extracted; 53.5% of patients reported no prior symptoms, 22.7% with two or more episodes. There was documented evidence in military dental records of previous problems in 29.2% of cases. 11.3% had previously been listed for extraction of the presenting tooth. Dental treatment for troops in combat situations is fraught with difficulty. Special consideration must be given to the management of third molars in military personnel.

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

    Science.gov (United States)

    Plakwicz, Paweł; Czochrowska, Ewa Monika; Milczarek, Anna; Zadurska, Malgorzata

    2014-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Rodrigo Castellazzi Sella

    2009-12-01

    Full Text Available OBJETIVOS: comparar os valores médios normais das angulações mesiodistais dentárias, propostos por Ursi, em 1989, com as angulações mesiodistais de caninos, pré-molares e molares inferiores em indivíduos com e sem a presença dos terceiros molares inferiores e idades entre 18 e 25 anos. Além disso, foram comparados os valores das angulações mesiodistais desses dentes nessas duas situações. MÉTODOS: foram utilizadas 40 radiografias ortopantomográficas de indivíduos, de ambos os gêneros, que não receberam tratamento ortodôntico, divididos em dois grupos: Grupo I, constituído por 20 radiografias que não apresentavam os terceiros molares inferiores; e Grupo II, formado por 20 radiografias com os terceiros molares inferiores presentes. RESULTADOS E CONCLUSÕES: a análise dos resultados e a análise estatística permitiram concluir que ambos os grupos exibiram pré-molares e molares inferiores mais angulados em sentido mesial, quando comparados à oclusão normal. Por outro lado, a angulação mesiodistal de caninos inferiores mostrou-se semelhante àquela apresentada em casos de oclusão normal. Os dois grupos, quando comparados entre si, exibiram semelhantes valores angulares dos caninos, pré-molares e molares inferiores, de modo que a presença dos terceiros molares não exerceu influência sobre essas angulações mesiodistais dentárias.AIM: To compare the normal mean values of the mesiodistal axial angulation, proposed by Ursi in 1989, with the mesiodistal axial angulation of canine teeth, premolar and inferior molars in individuals with and without the presence of the third inferior molars and ages between 18 and 25 years. Besides, the values of the mesiodistal axial angulation of these teeth were compared in these two situations. METHODS: Forty panoramic x-rays were used from individuals of both genders that didn't receive orthodontic treatment, divided in two groups: Group I, constituted by 20 x-rays that didn't present

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

    OpenAIRE

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

    2009-01-01

    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....

  14. Preformed metal crowns for decayed primary molar teeth.

    Science.gov (United States)

    Innes, N P T; Ricketts, D N J; Evans, D J P

    2007-01-24

    Preformed metal crowns (PMCs) are recommended by the British Society of Paediatric Dentistry (BSPD) for restoring badly broken down primary molar teeth. However, few dental practitioners adopt this technique in clinical practice, citing cost and clinical difficulty as reasons for this. Whilst there is a subjective impression by clinical academics that PMCs provide a more durable restoration than filling materials, there appears to be little evidence within the literature to support this. The primary aim of this systematic review was to compare clinical outcomes for primary molar teeth restored using PMCs compared to those restored with filling materials. The literature was searched using: the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library 2005, Issue 3); MEDLINE (1966 to August 2005); EMBASE (1980 to August 2005); System for Information on Grey Literature in Europe (SIGLE) (1976 to August 2005). Relevant publications' reference lists were reviewed for relevant articles. The most recent search was carried out on 24 August 2005. Randomised controlled trials (RCTs) that assessed the effectiveness of PMCs compared with filling materials or where there had been no treatment in children with untreated tooth decay in one or more primary molar teeth. Two review authors independently assessed the title and abstracts for each article from the search results to decide whether it was likely to be relevant. Full papers were obtained for relevant articles and all three review authors studied these. Forty-seven records were retrieved by the search strategies of which some were duplicates. Of these, 14 studies were scrutinised. No studies met the inclusion criteria and six studies were excluded from the review as they were either retrospective in design or reported as prospective outcomes but not randomised. No data were available for extraction and analysis and therefore, no conclusion could be made as to whether PMCs were more successful than

  15. X-RAY MEASUREMENTS OF IMPACTED MANDIBULAR THIRD MOLARS

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    Petya G. Kanazirska

    2017-03-01

    Full Text Available The X-ray diagnostics is essential in case of retention of teeth. An important condition for proper treatment plan for impacted third molars of the mandible is the determination of the type of retention in the jaw in accordance with their medio-distal inclination and the space available for eruption (retromolar space. Purpose: The purpose of this article is to present an objective method for determination of the medio-distal inclination and the space for eruption of the third molars of the mandible. Materials and methods: The studied patients with impacted third molars of the mandible are 127, aged 17 through 60. They were examined with Cone-beam Computed Tomography (CBCT. On the orthopantomography, obtained after the scanning as a reconstructed image, we defined the medio-distal inclination and space for eruption of the third molars of the mandible. For this purpose, we summarized several methods. Results: The most common inclination of the third molars of the mandible with retained eruption is the medial one at 120 teeth (61.5% ± 3.5. Second in frequency is the vertical one-34 teeth (17.4% ± 2.7, followed by the distal inclination– 21 teeth (10.8% ± 2.2. With the lowest frequency are the teeth which are positioned horizontally –20 teeth (10.3% ± 2.2. Shortage of retromolar space is established for173 teeth (88.7% ± 2.3. In 22 teeth (11.3% ± 2.3 there is enough space in the jaw for eruption. Conclusion: An objective method for determination of the medio-distal inclination of the teeth and the space available for eruption is introduced for the first time in Bulgaria. By determining the inclination of impacted wisdom teeth under this methodology one can avoid the subjective factor–the seventh tooth. It is not a reference plane, because it can also be tilted or missing. With the help of the developed method the retromolar point can be determined more objectively.

  16. Delayed onset infections after lower third molar germectomy could be related to the space distal to the second molar.

    Science.gov (United States)

    Monaco, G; Cecchini, S; Gatto, M R; Pelliccioni, G A

    2017-03-01

    The onset of delayed infection after lower third molar germectomy is influenced by the amount of distal space. This retrospective study aimed to determine whether the incidence of delayed onset infection is related to the space distal to the second molar. The ratio between the distal space and the crown width, measured according to the Ganss protocol on panoramic radiographs, was obtained for 218 surgical germectomies performed for orthodontic reasons in 134 patients. A delayed onset infection occurred following 20 germectomies at between 2 and 8 weeks after surgery; purulent exudates from the alveolus and swelling were present. In 16 of the 20 cases of infection, a Ganss ratio of <0.5 showed the almost complete absence of space distal to the second molar. This study found that the distal space was significantly and inversely correlated with delayed onset infection (P=0.004). From a clinical point of view, it is important for the surgeon to be aware that a higher Ganss ratio may indicate that a delayed onset infection is less likely to occur and that a lower Ganss ratio could indicate a greater likelihood of this type of infection, so that the patient can be properly informed. Copyright © 2016 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.

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

    Science.gov (United States)

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

    2014-01-01

    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

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

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    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

    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.

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

    Science.gov (United States)

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

    2013-10-01

    The aim of this retrospective study was to quantitatively evaluate the treatment effects of intrusion of overerupted maxillary molars using miniscrew implant anchorage and to investigate the apical root resorption after molar intrusion. The subjects included 30 patients whose average ages were 35.5±9.0 years. All patients had received intrusion treatments for overerupted maxillary molars with miniscrew anchorage. There were 38 maxillary first molars and 26 maxillary second molars to be intruded. Two miniscrews were inserted in the buccal and palatal alveolar bone mesial to the overerupted molar. Force of 100-150 g was applied by the elastic chains between screw head and attachment on each side. Lateral cephalograms and panoramic radiographs taken before and after intrusion were used to evaluate dental changes and root resorption of molars. Only 6 of the 128 miniscrews failed. The first and second molars were significantly intruded by averages of 3.4 mm and 3.1 mm respectively (Pintrusion time was more than 6 months. The crown of the molars mesially tilted by averages of 3.1 degrees and 3.3 degrees (Pintrusion treatment of overerupted molars with miniscrew anchorages could be used as an efficient and reliable method to recover lost restoration space for prosthesis. Radiographically speaking, root resorption of molars was not clinically significant after application of intrusive forces of 200 to 300 g.

  20. Mesial inclination of impacted third molars and its propensity to stimulate external root resorption in second molars--a cone-beam computed tomographic evaluation.

    Science.gov (United States)

    Oenning, Anne Caroline Costa; Melo, Saulo Leonardo Sousa; Groppo, Francisco Carlos; Haiter-Neto, Francisco

    2015-03-01

    To investigate the presence of external root resorption (ERR) in second molars adjacent to horizontally and mesioangular impacted mandibular third molars by cone-beam computed tomography. In addition, patient characteristics (age and gender) and third molar depth were correlated with the presence of ERR. The sample consisted of 116 scans (58 acquired on the i-CAT Classic and 58 on the Picasso-Trio) of 70 women and 46 men (mean age, 23.7 yr). Two observers recorded the presence of ERR in the second molars, inclination and depth of third molars in relation to bone and soft tissues, third molars classification according to Pell and Gregory, and location and severity of ERR. Data were analyzed by analysis of variance, Mann-Whitney test, and χ(2) test. The κ test was used to analyze intraobserver agreement. The overall prevalence of ERR was 49.43%. There were no statistically significant differences in the detection of ERR by gender, images from the 2 devices, or third molar inclination (P > .05). The κ test showed excellent reproducibility values (κ = 0.7778). There was a smaller proportion of affected patients 14 to 24 years old and ERR in teeth adjacent to Class C third molars. Mesially inclined third molars (mesioangular and horizontal) have a greater potential of being associated with ERR in second molars, which was shown by the high prevalence of the condition in the overall sample. Class A and B third molars in patients older than 24 years were more associated with the presence of ERR in adjacent teeth. Copyright © 2015 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

  1. Association between the presence of a partially erupted mandibular third molar and the existence of caries in the distal of the second molars.

    Science.gov (United States)

    Falci, S G M; de Castro, C R; Santos, R C; de Souza Lima, L D; Ramos-Jorge, M L; Botelho, A M; Dos Santos, C R R

    2012-10-01

    The objective of this study was to verify, using periapical radiographs, whether a partially erupted mandibular third molar is a factor in the presence of dental caries on the distal surface of the adjacent second molar. Two-forty six high quality periapical radiographs were selected, each showing a partially erupted mandibular third molar. The variables analyzed were: tooth number; gender; age; radiographic presence of caries on the distal surface of the adjacent molar; Pell and Gregory classification; Winter classification; angulation and distance between the second and mandibular third molar. The examiners were previously calibrated to collect data (kappa statistics from 0.87 to 1.0). The prevalence rate of caries on the distal surface of the second molar was 13.4%. In the logistical multivariate regression analysis, the angulation (OR=8.5; IC95%: 1.7-43.8; p=0.011) and the gender (OR=3.3; IC95%: 1.4-7.7; p=0.005) remained statistically significant after an age adjustment was made. The results indicate that the presence of a partially erupted mandibular third molar with an angulation of 31 degrees or more, is a risk factor for caries on the distal surface of the mandibular second molars. Copyright © 2012 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.

  2. Unilateral failure of development of mandibular premolars and molars in an Eastern Grey kangaroo (Macropus giganteus) and its effects on molar progression.

    Science.gov (United States)

    Barber, D; Campbell, J; Davey, J; Luke, T; Agren, E; Beveridge, I

    2008-01-01

    An adult male Eastern Grey kangaroo from a wildlife reserve near Melbourne was submitted for necropsy examination and was discovered to have abnormal dentition. There was no evidence that any premolars or molars had ever been present on the right mandible, whilst the incisors were normal. The age of the kangaroo was estimated to be 1 year 9 months using the right maxillary molars and 2 years 4 months old using the contralateral side, presumably due to the asymmetry of the dental arcades. 'Lumpy jaw', a common periodontal disease of kangaroos, from which Bacteroides sp was cultured, was present on the base of the vertical ramus of the left mandible. Complete unilateral absence of premolar and molar teeth in the mandible of a kangaroo has not been described. This condition affected molar progression in both sets of maxillary molars.

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

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    Ania Moreno Véliz

    2008-06-01

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

  4. CONSIDERACIONES EN TORNO AL POSIBLE CARÁCTER MERCANTIL DE LAS SOCIEDADES COOPERATIVAS Y ACERCA DE LAS LIMITACIONES A LA REALIZACIÓN DE OPERACIONES CON TERCEROS NO SOCIOS DE ESTAS ENTIDADES / COOPERATIVES: COMMERCIAL AND TRANSACTIONS WITH THIRD PARTIES. A COMMENTARY.

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    Lluís CARRERAS ROIG

    2011-09-01

    Full Text Available En este trabajo se hace referencia a la posible consideración de las sociedades cooperativas como sociedades mercantiles, cumpliéndose determinadas circunstancias, y ello sin pérdida de sus características específicas en cuanto a la toma de decisiones, el reparto de beneficios y la búsqueda de la satisfacción de fines de interés general. Asimismo, se analizan las consecuencias de aumentar el porcentaje de operaciones realizadas con terceros no socios, respecto del total de operaciones realizadas por la sociedad cooperativa, y su incidencia en la cuantía de los fondos de la cooperativa y en la retribución del socio cooperativista. Se realiza en este punto una comparación con las sociedades capitalistas convencionales (S.A., S.L.. Finalmente, se propone una reforma legislativa al objeto de permitir aumentar el porcentaje de realización de operaciones cooperativizadas con terceros no socios, y ello sin pérdida de su tratamiento fiscal favorable. / This paper refers to the possible consideration of cooperative societies as a commercial companies, fulfilling certain circumstances and without loss of its specific characteristics in terms of decision-making, benefit sharing and the search for satisfaction general interest. We also analyze the effect of increasing the percentage of transactions with third parties in respect of all transactions undertaken by the cooperative, and its impact on the amount of the funds of the cooperative and the pay of a collaborator. Is done at this point a comparison with conventional capitalist societies (S.A, S.L.. Finally, we propose a legislative reform in order to allow and increase in the percentage of completion of transactions with third parties in cooperatives, and without loss of favourable tax treatment.

  5. Anesthetic management in thyroid crisis triggered by molar pregnancy

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    Harun Aydoğan

    2012-09-01

    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 β-hCG. The hCG molecule consists of α and β subunits; the α subunit is identical to TSH and the β 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

  6. Relationship between root development of third molars and chronological age

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    Suárez Canlla, Carlos Alberto; Facultad de Odontología Universidad Nacional “San Luis Gonzága” Ica

    2014-01-01

    La estimación de la edad en individuos de 14 a 25 años es de utilidad para la identificación humana en la práctica clínica y tanatológica forense, así también, como indicador del crecimiento y desarrollo. Cuando todos los dientes permanentes han completado su formación, el desarrollo radicular de la tercera molar es el único indicador que puede ser utilizado para lograr predecir la edad de los individuos hasta los 25 años. El presente estudio piloto tiene como objetivo establecer la relación ...

  7. Irregular Periapical Radiopacity in Mandibular Premolars and Molars

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    S. Aravind Warrier

    2014-01-01

    Full Text Available Increased deposition of cementum is observed in a wide number of both benign and malignant conditions. Many cases are often diagnosed during routine examination as an incidental finding. Diagnosing correctly without confusing it with other similarly appearing lesions, thus avoiding subjecting the patient to unnecessary investigations and stress, is of prime importance. We report one such case, where the patient presented with the routine complaint of a painful tooth, during the investigation of which he was also diagnosed with hypercementosis affecting the mandibular second premolars and molars bilaterally. The literature review reveals that not many cases of hypercementosis are frequently reported.

  8. Mini-implants: mechanical resource for molars uprighting

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    Susiane Allgayer

    2013-02-01

    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

  9. Pericoronitis, deep fascial space infections, and the impacted third molar.

    Science.gov (United States)

    Litonjua, L S

    1996-01-01

    Patients consulting the Philippine General Hospital Dentistry Department for management of impacted mandibular third molars were studied for the presence of pericoronits and deep fascial space infections. 18% of total cases presented an infection, while 13% presented with pericoronitis. 11% presented with deep fascial infection of which 72% were secondary to pericoronitis. A radiographic evaluation showed the vertical angulation (68%) with the highest portion at or above the occlusal level (70%) associated the most with pericoronits. The potential of pericoronitis developing to a deep space infection should always be considered.

  10. Development of caries in permanent first molars adjacent to primary second molars with interproximal caries: four-year prospective radiographic study.

    Science.gov (United States)

    Vanderas, Apostole P; Kavvadia, Katerina; Papagiannoulis, Lisa

    2004-01-01

    This study investigated the effect of the primary second molars' distal surface caries on the incidence of the permanent first molars' mesial surface caries in 613 paired tooth surfaces of children ages 6 to 8 years at baseline examination. Proximal caries and its progression were diagnosed by bite-wing radiographs taken at a 1-year interval over a period of 4 years. The permanent first molars' mesial surfaces and primary second molars' distal surfaces were examined. Recorded were: (1) sound surfaces; (2) carious lesions on the enamel's external and internal half and on the dentin's external, middle, and internal third; (3) filled, extracted, and exfoliated teeth. The logistic model for panel data was employed to estimate the effect of proximal caries of the primary second molars' distal surfaces on the incidence of the permanent first molars' mesial surface caries. The 95% confidence interval probability was used. Sensitivity and specificity as well as the positive and negative predictive rates were computed. The results showed that the presence of proximal caries on each primary second molars' distal surfaces significantly affected the development of proximal caries on the corresponding permanent first molar's mesial surfaces. Age was estimated to exert a positive and highly significant impact, while gender had no effect. The odds ratio values ranged from 4.86 to 63.43. The values of sensitivity and specificity ranged from 45% to 97% and 80% to 89%, respectively, while the positive and negative rates ranged from 40% to 56% and 90% to 99%, respectively. Proximal caries present on the primary second molars' distal surfaces increases the risk of developing caries on the permanent first molars' mesial surfaces. This risk, however, is different among the paired surfaces studied.

  11. Size of the lower third molar space in relation to age in Serbian population

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    Zelić Ksenija

    2013-01-01

    Full Text Available Background/Aim. It is considered that the shortage of space is the major cause of the third molar impaction. The aim of this study was to establish the frequency of insufficient lower third molar eruption space in Serbian population, to question the differences in this frequency in the subjects of different age, to determine the influence of the lower third molar space (retromolar space size on third molar eruption, and to investigate a possible correlation between the size of gonial angle and the space/third molar width ratio. Methods. Digital orthopantomograms were taken from 93 patients divided into two groups: early adult (16-18 years of age and adult (18-26 patients. Retromolar space, mesiodistal third molar crown width, gonial angle and eruption levels were measured. Results. The space/third molar width in early adult subjects was smaller (p < 0.0001 and insufficient space was significantly more frequent (p = 0.0003 than in adult patients. Considerably more third molars erupted in case of enough space in both age groups (p < 0.0001. There was no difference between the means of gonial angle size in relations to the available space. Conclusions. The retromolar space/third molar width ratio is more favorable in adult subjects. Gonial angle is not in correlation with the retromolar space/third molar width ratio. [Projekat Ministarstva nauke Republike Srbije, br. 45005

  12. Comparison of Primary Molar Crown Dimensions with Stainless Steel Crowns in a Sample of Iranian Children.

    Science.gov (United States)

    Afshar, Hossein; Kamali Sabeti, Arghavan; Shahrabi, Mahdi

    2015-01-01

    Background and aims. Due to anatomic variation in tooth anatomy between populations, this study compared the buccolingual (BL) and mesiodistal (MD) dimensions of primary molars with those of stainless steel crowns (SSCs) in anIranian population. Materials and methods. Impressions were taken from both dental arches of children, and casts were poured. Teeth with caries, restoration, hypoplasia or other dental anomalies were excluded. 216 primary molars were selected and divided into 4 groups of 54 each (maxillary and mandibular first and second primary molars). MD/BL dimensions were measured using a digital caliper with 0.01 mm precision on casts and SCCs (3M brand). Data were assessed using paired t-test, post hoc test and ANOVA. P < 0.05 was considered statistically significant. Results. The MD dimension of the lower first molar SSC and the BL dimension of the lower second molar SSC had the least difference with the corresponding values of the respective teeth. The MD dimension of the upper second molar SSC and the BL dimension of the upper first molar SSC had the greatest difference with the corresponding values in the respective teeth. Comparison of the two different brands of SSCs for the upper first molar revealed that both types had significant differences with the teeth in terms of both MD (P = 0.0) and BL (P = 0.0) dimensions. Conclusion. In the studied population, best adaptation was seen in second lower molars and the least adaptationswere seen in first and second upper molars.

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

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

    2014-09-15

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

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

    Science.gov (United States)

    Jung, Yun-Hoa; Cho, Bong-Hae

    2014-09-01

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

  15. Banding versus bonding of first permanent molars: a multi-centre randomized controlled trial.

    Science.gov (United States)

    Nazir, Mariyah; Walsh, Tanya; Mandall, Nicky A; Matthew, Susie; Fox, Dee

    2011-06-01

    To assess the effectiveness of banding versus bonding of first permanent molars during fixed appliance treatment; in terms of attachment failure, patient discomfort and post-treatment enamel demineralization. Multi-centre randomized clinical trial. One District General Hospital Orthodontic Department and two Specialist Orthodontic Practices. Orthodontic patients aged between 10 and 18 years old, randomly allocated to either receive molar bands (n=40) or molar bonds (n=40). Bands were cemented with a conventional glass ionomer cement and tubes were bonded with light-cured composite to all four first permanent molar teeth for each subject. Attachments were reviewed at each recall appointment to assess loosening or loss. The clinical end point of the trial was the day of appliance debond. Enamel demineralization at debond was assessed using the modified International Caries Assessment and Detection System (ICDAS). The first time failure rate for molar bonds was 18·4% and 2·6% for molar bands (P=0·0002). Survival analysis demonstrated molar bonds were more likely to fail compared with molar bands. First permanent molars with bonded tubes experienced more demineralization than those with cemented bands (P=0·027). There was no statistically significant difference in discomfort experienced by patients after banding or bonding first permanent molars (P>0·05). This study shows that as part of fixed appliance therapy, American Orthodontics photoetched first permanent molar bands cemented with 3M ESPE Ketac-Cem perform better than American Orthodontics low profile photo-etched and mesh-based first permanent molar tubes bonded with 3M Unitek Transbond XT in terms of failure behaviour and molar enamel demineralization.

  16. Supplemental root in a mandibular first molar: a rarity

    Directory of Open Access Journals (Sweden)

    Poonam Mahajan

    2011-04-01

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

  17. [The first permanent molars and palatal or mandibular variations].

    Science.gov (United States)

    Coulomb, E; Blocquel, H; Laude, M; Hurel, C

    1990-01-01

    101 children, each of them with two teleradiographies, were selected. The first X-ray was taken at the time of the mixed dentition, the second one, when the permanent dentition was established. The purpose of the research is to show the oscillations of the palatine and mandibular planes, and their link to the movements of the first permanent molars. The palatine plane is found to swing between -7 degrees and +5 degrees with an average of -0.97 degree. The posterior part of that plane rocks downwards in 51% of the children. The limits are -7 degrees and -1 degree, with an average of -3.2 degrees. In 22%, the plane rocks upwards between +1 degree and +5 degrees with an average of +3.1 degrees. In 27% it moves parallel to itself. The posterior part of the mandibular plane varies between -6 degrees and +5 degrees, with an average of -1.1 degrees. It rocks downwards in 48% of the cases, between -6 degrees and -1 degree with an average of -3.9 degrees. In 22% of the children, this plane rocks upwards between +1 degree and +5 degrees with an average of +2.5 degrees. In 30%, it moves parallel to itself. The overall result is that the more the posterior part of the palate, or of the mandible moves downwards, the more the first permanent molars get straight or move forwards.

  18. Mandibular lip bumper treatment and second molar eruption disturbances.

    Science.gov (United States)

    Ferro, Fabrizia; Funiciello, Gloria; Perillo, Letizia; Chiodini, Paolo

    2011-05-01

    Mandibular lip-bumper (LB) nonextraction treatment, usually started before complete second molar (M2) eruption, inevitably interacts with the development of the dentition. Yet, its effects on M2 eruption are still unknown. The first aim of this study was to retrospectively investigate whether LB therapy (260 patients) enhances the risk for M2 ectopic eruptions and impactions in comparison with 135 untreated subjects. The second aim was to assess, among treated patients (n = 197), the main potential determinants of M2 impaction and ectopic eruption. M2 eruption and impaction were determined on panoramic radiographs. To assess the predictive role of M2 inclination in relation to the first molar, a panoramic radiograph suitable for this measurement before treatment was required. The data were analyzed by using software (version 8.2, SAS, Cary, NC). LB treatment significantly enhanced M2 impaction and ectopic eruption. Negative prognostic factors were found. An initial inclination of the M2 greater than 30° was significantly associated with a higher impaction risk compared with an angulation less than 10°. LB treatment duration longer than 2 years increased the risk of ectopic eruptions. While gaining space in the anterior arch, unwanted effects might be produced in the posterior arch. To be informed about these unplanned events is necessary to better optimize treatment. Copyright © 2011 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.

  19. Size and shape variability in human molars during odontogenesis.

    Science.gov (United States)

    Morita, W; Yano, W; Nagaoka, T; Abe, M; Nakatsukasa, M

    2014-03-01

    Under the patterning cascade model (PCM) of cusp development inspired by developmental genetic studies, it is predicted that the location and the size of later-forming cusps are more variable than those of earlier-forming ones. Here we assessed whether differences in the variability among cusps in total and each particular crown component (enamel-dentin junction [EDJ], outer enamel surface [OES], and cement-enamel junction [CEJ]) could be explained by the PCM, using human maxillary permanent first molars (UM1) and second deciduous molars (um2). Specimens were µCT-scanned, and 3D models of EDJ and OES were reconstructed. Based on these models, landmark-based 3D geometric morphometric analyses were conducted. Size variability in both tooth types was generally consistent with the above prediction, and the differences in size variation among cusps were smaller for the crown components completed in later stages of odontogenesis. With a few exceptions, however, the prediction was unsupported regarding shape variability, and UM1 and um2 showed different patterns. Our findings suggested that the pattern of size variability would be caused by temporal factors such as the order of cusp initiation and the duration from the beginning of mineralization to the completion of crown formation, whereas shape variability may be affected by both topographic and temporal factors.

  20. Altered distribution of Ghrelin protein in mice molar development.

    Science.gov (United States)

    Liu, Bo; Han, Xiuchun; Feng, Wei; Cui, Jian; Hasegawa, Tomoka; Amizuka, Norio; Xu, Xin; Li, Minqi

    2016-05-01

    Ghrelin, an appetite-stimulating hormone, plays diverse regulatory functions in cell growth, proliferation, differentiation and apoptosis during mammalian development. There is limited information currently available regarding Ghrelin expression during mammalian tooth development, thus we aimed to establish the spatiotemporal expression of Ghrelin during murine molar odontogenesis. Immunohistochemistry was performed to detect the expression pattern of Ghrelin in mandible molar from E15.5 to PN7 during murine tooth development. The results showed that Ghrelin initially expressed in the inner enamel epithelium and the adjacent mesenchymal cells below, further with persistent expression in the ameloblasts and odontoblasts throughout the following developmental stages. In addition, Ghrelin was also present in Hertwig's epithelial root sheath at the beginning of tooth root formation. These results suggest that Ghrelin was present in tooth organs throughout the stages of tooth development, especially in ameloblasts and odontoblasts with little spatiotemporal expression differences. However, the potential regulatory roles of this hormone in tooth development still need to be validated by functional studies. Copyright © 2016 Elsevier Ltd. All rights reserved.

  1. Nanoparticle counting: towards accurate determination of the molar concentration.

    Science.gov (United States)

    Shang, Jing; Gao, Xiaohu

    2014-11-07

    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.

  2. Reliability in estimating taurodontism of permanent molars from orthopantomograms.

    Science.gov (United States)

    Tulensalo, T; Ranta, R; Kataja, M

    1989-10-01

    Taurodontism is a morphologic dental trait showing continuous expressivity, and criteria of the degree of pulp chamber elongation vary in different investigations. The aim of this investigation was to test a simple method of assessing taurodontism in the developing dentition from orthopantomograms in order to determine its reliability for later use in epidemiologic investigations. The method was also compared with other methods. Forty-three children 10-16.9 yr of age with one or more taurodontic permanent first or second molars were selected for the study. A subgroup of 16 children with two longitudinally obtained radiographs was used in a follow-up study of the same tooth in two different formational stages. The follow-up time averaged 2.2 yr. The distance between the baseline connecting the mesial and distal points of the cementoenamel junction and the highest point of the floor of the pulp chamber was measured (Measure 3). A tooth was classified as taurodontic when Measure 3 reached or exceeded 3.5 mm. This distance remained unchanged during the course of tooth development. Intraexaminer reliability of two examiners in reproducing the same classification was, on average, 96.2%, and the interexaminer reliability was 93.2%. The reliability was greater for the first than for the second molars. Results obtained by this method agreed well with those obtained by other methods. Measure 3 proved to be reliable in assessing taurodontism in the developing dentition from orthopantomograms in epidemiologic investigations.

  3. Nanoparticle Counting: Towards Accurate Determination of the Molar Concentration

    Science.gov (United States)

    Shang, Jing; Gao, Xiaohu

    2014-01-01

    Summary 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 ranges of nanoparticles. As research and uses of nanomaterials being explored in an unprecedented speed, it is necessary to develop universal strategies that are easy to use, and 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

  4. Regulators of Collagen Fibrillogenesis during Molar Development in the Mouse

    Directory of Open Access Journals (Sweden)

    Ivana Zvackova

    2017-08-01

    Full Text Available Development of mammalian teeth and surrounding tissues includes time–space changes in the extracellular matrix composition and organization. This requires complex control mechanisms to regulate its synthesis and remodeling. Fibril-associated collagens with interrupted triple helices (FACITs and a group of small leucine-rich proteoglycans (SLRPs are involved in the regulation of collagen fibrillogenesis. Recently, collagen type XII and collagen type XIV, members of the FACITs family, were found in the peridental mesenchyme contributing to alveolar bone formation. This study was designed to follow temporospatial expression of collagen types XIIa and XIVa in mouse first molar and adjacent tissues from embryonic day 13, when the alveolar bone becomes morphologically apparent around the molar tooth bud, until postnatal day 22, as the posteruption stage. The patterns of decorin, biglycan, and fibromodulin, all members of the SLRPs family and interacting with collagens XIIa and XIVa, were investigated simultaneously. The situation in the tooth was related to what happens in the alveolar bone, and both were compared to the periodontal ligament. The investigation provided a complex localization of the five antigens in soft tissues, the dental pulp, and periodontal ligaments; in the mineralized tissues, predentin/dentin and alveolar bone; and junction between soft and hard tissues. The results illustrated developmentally regulated and tissue-specific changes in the balance of the two FACITs and three SLRPs.

  5. Third molar removal: an overview of indications, imaging, evaluation, and assessment of risk.

    Science.gov (United States)

    Marciani, Robert D

    2007-02-01

    Asymptomatic third molars may have associated periodontal pathology that may not be limited to the third molar region and have a negative impact on systemic health. Third molars should be considered for removal when there is clinical, radiographic, or laboratory evidence of acute or chronic periodontitis, caries, pericoronitis, deleterious effects on second molars, or pathology. Radiographic findings of extreme locations of impacted teeth, dense bone, dilacerated roots, large radiolucent lesions associated with impactions, and lower third molar apices in cortical inferior border bone are predictive of more complex surgery. Certain demographic and oral health conditions available to the surgeon before surgery and intraoperative circumstances are predictive of delayed recovery for health-related quality of outcomes and delayed clinical outcomes after third molar surgery.

  6. Correlation of acute pericoronitis and the position of the mandibular third molar.

    Science.gov (United States)

    Leone, S A; Edenfield, M J; Cohen, M E

    1986-09-01

    Acute pericoronitis is a painful, debilitating infection that is most commonly found among young adults with erupting mandibular third molars. Prophylactic removal of third molars to prevent this disease has been advocated, but this procedure requires an accurate description of the third molar at highest risk for this infection. Clinical and radiographic measurements were compared in 25 diseased subjects and 109 normal subjects. Of 10 variables significantly related to the presence of acute pericoronitis, stepwise discriminant analysis selected 4 variables that produced a canonical correlation coefficient of 0.71. In clinical terms, these variables described the tooth at highest risk for acute pericoronitis as a fully erupted, vertical mandibular third molar that is in contact with the adjacent second molar, at or above the occlusal plane, and partially encapsulated by soft or hard tissues. Prophylactic treatment of these third molars is highly recommended.

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

    Directory of Open Access Journals (Sweden)

    Darwin Vaz de Lima

    2013-04-01

    Full Text Available 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 the 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.

  8. Age estimation using development of third molars in South Indian population: A radiological study.

    Science.gov (United States)

    Priyadharshini, K Indra; Idiculla, Jose Joy; Sivapathasundaram, B; Mohanbabu, V; Augustine, Dominic; Patil, Shankargouda

    2015-05-01

    To assess the estimation of chronological age based on the stages of third molar development following the eight stages (A-H) method of Demirjian et al. in Chennai population of South India. A sample consisting of 848 individuals (471 males and 377 females) aged between 14 and 30 years was randomly selected for the clinical evaluation and 323 orthopantomograms with clinically missing third molars were taken for radiological evaluation using Demirjian's method from a Chennai population of known chronological age and sex. Statistical analysis was performed using Pearson's Chi-square test and mean values were compared between the study groups using t-test or analysis of variance (ANOVA) followed by Tukey's highly significant difference (HSD). In the present study, P < 0.05 was considered as the level of significance. The results showed that the mean age of having clinically completely erupted maxillary third molars was 22.41 years in male subjects and 23.81 years in female subjects and that of mandibular third molars was 21.49 years in male subjects and 23.34 years in female subjects. Mandibular third molars were clinically missing more often in females than in males. Eruption of mandibular third molars was generally ahead of the emergence of maxillary third molars into the oral cavity. Third molar development between male and female subjects showed statistically significant differences at calcification stage F and stage G in maxillary third molars and stage F in mandibular third molars (P < 0.05). There are differences indicating that maxillary and mandibular third molar eruption reached Demirjian's formation stages earlier in males than in females. It is suggested that in future studies, to increase the accuracy of age determination, indications of sexual maturity and ossification should also be evaluated in addition to third molar mineralization.

  9. [Role of lower third molars in the development of dental malocclusion: review of the literature].

    Science.gov (United States)

    Garattini, G; Grecchi, M T; Vogel, G

    1990-01-01

    The Author's aims was to review the role of the lower third molars in delayed crowding of the jaw. A global agreement exists on the fact that lower molars should be considered only one between several factors able to cause malocclusion. Finally, the germectomy of the third molars has to be performed only in carefully selected patients after a comprehensive diagnostic evaluation of the single case.

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

    OpenAIRE

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

    2014-01-01

    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 an...

  11. Success Rate of Zinc Oxide Eugenol in Pulpectomy of Necrotic Primary Molars: A Retrospective Study

    OpenAIRE

    Zahra Bahrololoomi; Shiva Zamaninejad

    2015-01-01

    Introduction: Pulpectomy is a conservative treatment plan for primary necrotic teeth and Zinc Oxide Eugenol is still a good choice as root canal filling material but long term studies on poor prognosis molars are limited and almost contradictory. The purpose of this study is to evaluate the clinical and radiographical success rate of pulpectomy of necrotic primary molars using ZOE as the root canal filling material. Methods: 152 records of 76 primary molars on which two-visit pulpectomy had b...

  12. Fate of third molar in line of mandibular angle fracture - Retrospective study

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    Preetha Balaji

    2015-01-01

    Conclusion: The present study fails to identify any concrete factors that would predict the failure of the retained third molar that were involved in the line of mandibular fractures. The proof presented here, especially with low complication rates indicate that all impacted third molar along the line of fracture be removed and unless necessary, the partially erupted teeth would also be extracted. In such a situation, the rate of infection and survival of the third molar would have been entirely different.

  13. Orthodontic Molar Brackets: The Effect of Three Different Base Designs on Shear Bond Strength

    OpenAIRE

    Hudson, Athol P.; Grobler, Sias R.; Harris, Angela M. P.

    2011-01-01

    The purpose of the study was to assess the relative base designs of three different maxillary molar stainless steel brackets with reference to the shear bond strength of three different adhesive resins. The molar brackets used were Victory series (3M Unitek), Upper Molar (GAC) and Optimesh XRT (Ormco). The adhesives used were Transbond XT (3M Unitek), Enlight (Ormco) and Sure Ortho Light Bond (Sure Orthodontics). The human enamel specimens (144) were randomly divided into nine groups and each...

  14. Independent and Confluent Middle Mesial Root Canals in Mandibular First Molars: A Report of Four Cases

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    Mohanavelu Deepalakshmi

    2012-01-01

    Full Text Available Mandibular molars demonstrate considerable variations with respect to number of roots and root canals. The possibility of additional root canals should be considered even in teeth with a low frequency of abnormal root canal anatomy. This paper discusses the endodontic management of the rare anatomical complexity middle mesial canals in mandibular first molar and also serves to remind the clinicians that such anatomical variations should be taken into account during the endodontic treatment of the mandibular molars.

  15. Excess molar volumes and apparent molar volumes of some amide + water systems at 303.15 and 308.15 K

    Energy Technology Data Exchange (ETDEWEB)

    Pal, A.; Singh, Y.P. [Univ. of Kurukshetra (India). Dept. of Chemistry

    1995-07-01

    Excess molar volumes V{sub m}{sup E} for the binary mixtures of N-methylformamide, N,N-dimethylformamide, 2-pyrrolidinone, N-methyl-2-pyrrolidinone, and N,N-dimethylacetamide with water have been measured using a continuous-dilution dilatometer at 303.15 and 308.15 K as a function of composition. In all mixtures, the excess molar volumes are negative over the entire composition range. The results were used to estimate the apparent molar volumes of the components. The values of these two properties have been discussed in terms of intermolecular interactions between the mixing components of the binary mixture.

  16. The effect of headgear on upper third molars: a retrospective longitudinal study.

    Science.gov (United States)

    Miclotte, Annelie; Grommen, Bieke; Lauwereins, Steven; Cadenas de Llano-Pérula, Maria; Alqerban, Ali; Verdonck, Anna; Fieuws, Steffen; Jacobs, Reinhilde; Willems, Guy

    2017-08-01

    To investigate the effects of orthodontic non-extraction treatment with or without headgear on the position of and the space available for upper third molars in growing children with class II malocclusions. The sample consisted of pre- and post-treatment panoramic radiographs and lateral cephalograms of 294 class II orthodontic patients; 160 were treated with headgear and 134 were treated without headgear. The space available for the upper third molar was measured on the lateral cephalogram as the distance from pterygoid vertical (PTV) to the distal surface of the upper first molar crown (PTV-M1). Angulation, vertical position and tooth development stage of the upper third molars were evaluated on panoramic radiographs. All measurements were evaluated statistically. In both groups PTV-M1 increased, but the increase in PTV-M1 was significantly higher for patients treated without headgear. A linear model for repeated measures revealed that this difference was still significant after correction for age, gender and molar occlusion. Further, there is no evidence that the change in angulation, vertical position and development stage of the upper third molars during orthodontic treatment is influenced by headgear therapy. This study indicates that the use of headgear in growing patients significantly affects the space available for upper third molars. However, orthodontic treatment with headgear does not influence the angulation, vertical position and development stage of upper third molars. It is therefore important to always take into account third molars during treatment planning.

  17. Horizontal and vertical changes in anchor molars after extractions in bimaxillary protrusion cases

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    Pratik Chandra

    2016-01-01

    Full Text Available Objective: To evaluate changes in the anchor molar position (horizontal, vertical after retraction in bimaxillary protrusion maximum anchorage cases. Materials and Methods: Thirty patients requiring maximum anchorage after extraction of the first premolars were selected for this study. The second molars were banded in both arches along with trans-palatal arch in the maxillary arch and lingual arch in the mandibular arch. En mass retraction was done using sliding mechanics. Horizontal and vertical positions of the anchor first molars were evaluated cephalometrically before and after orthodontic retraction. Results: In the horizontal plane, maxillary first molars showed net mesial movement of 1.72 mm, and there was a statistical difference between the pre- and post-values (P < 0.001. The mandibular molars showed a net horizontal movement of 2.26 mm, and there was a statistically significant difference between the pre- and post-values (P < 0.001. In the vertical plane, there was vertical movement of the maxillary anchor molars by a net value of 0.95 mm which was statistically significant (P < 0.001. The mandibular anchor molars moved vertically by a net value of 0.45 mm. This difference was statistically not significant. Conclusion: There was anchorage loss seen in both the planes (horizontal, vertical of the maxillary anchor molars. In the mandibular anchor molars, there was anchorage loss seen only in the horizontal plane. No anchorage loss was seen in the vertical plane.

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

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    Reddy S

    2008-03-01

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

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

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    Gintaras Juodzbalys

    2013-06-01

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

  20. Effect of solution molarity on properties of hydrothermally grown ZnO nanostructures

    Science.gov (United States)

    Chen, Yi; Chen, Wei-You; Hsu, Hung-Pin; Lee, Jiunn-Chyi; Wu, Ya-Fen

    2017-07-01

    In this work, the hydrothermally grown ZnO nanostructures were successfully prepared on indium tin oxide glass using different aqueous solution molarities. The effect of solution molarity on the structual and optical properties of ZnO nanostructures were studied by X-ray diffraction and temperature-dependent photoluminescence (PL) measurements. The PL intensity ratio of the ultraviolet emission to the visible emission is also calculated. It is found that the crystal quality and the optical properties are improved by raising the solution molarity, but too higher solution molarity should lead to the disorder of ZnO structures, and deteriorate the crystal quality.

  1. Assessment of maxillary third molars with panoramic radiography and cone-beam computed tomography

    Energy Technology Data Exchange (ETDEWEB)

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

    2015-12-15

    This study investigated maxillary third molars and their relation to the maxillary sinus using panoramic radiography and cone-beam computed tomography (CBCT). A total of 395 maxillary third molars in 234 patients were examined using panoramic radiographs and CBCT images. We examined the eruption level of the maxillary third molars, the available retromolar space, the angulation, the relationship to the second molars, the number of roots, and the relationship between the roots and the sinus. Females had a higher frequency of maxillary third molars with occlusal planes apical to the cervical line of the second molar (Level C) than males. All third molars with insufficient retromolar space were Level C. The most common angulation was vertical, followed by buccoangular. Almost all of the Level C molars were in contact with the roots of the second molar. Erupted teeth most commonly had three roots, and completely impacted teeth most commonly had one root. The superimposition of one third of the root and the sinus floor was most commonly associated with the sinus floor being located on the buccal side of the root. Eruption levels were differently distributed according to gender. A statistically significant association was found between the eruption level and the available retromolar space. When panoramic radiographs showed a superimposition of the roots and the sinus floor, expansion of the sinus to the buccal side of the root was generally observed in CBCT images.

  2. [Dissertations 25 years after date 47. Third molars in the lower jaw].

    Science.gov (United States)

    Maertens, J K M

    2016-12-01

    Mandibular third molar impaction causes many problems in the lower jaw. It has been assumed, for example, that impacted third molars are the cause of recurrent problems following orthodontic treatment. In order to prevent problems surgical removal of third molar buds, a germectomy, was proposed. An important factor was to predict the development of the third molar. In doctoral research, this was investigated. The causal relationship between the eruption of third molars and crowding of the lower front has never been proven. Therefore the preventive removal of asymptomatic impacted lower third molars is not advisable. It is, however, advisable to remove all asymptomatic partially erupted impacted third molars that are mesioangulated, distoangulated or horizontally impacted when the patient is between 18 and 25 years old. The absence of clear and clinically applicable predictions of problems relating to the eruption of third molars limits the indication of their germectomy. This doctoral research from 1990 produced a formula for predicting the eruption of third molars in the lower jaw.

  3. Mandibular third molar impaction: review of literature and a proposal of a classification.

    Science.gov (United States)

    Juodzbalys, Gintaras; Daugela, Povilas

    2013-07-01

    The purpose of present article was to review impacted mandibular third molar aetiology, clinical anatomy, radiologic examination, surgical treatment and possible complications, as well as to create new mandibular third molar impaction and extraction difficulty degree classification based on anatomical and radiologic findings and literature review results. Literature was selected through a search of PubMed, Embase and Cochrane electronic databases. The keywords used for search were mandibular third molar, impacted mandibular third molar, inferior alveolar nerve injury third molar, lingual nerve injury third molar. The search was restricted to English language articles, published from 1976 to April 2013. Additionally, a manual search in the major anatomy and oral surgery journals and books was performed. The publications there selected by including clinical and human anatomy studies. In total 75 literature sources were obtained and reviewed. Impacted mandibular third molar aetiology, clinical anatomy, radiographic examination, surgical extraction of and possible complications, classifications and risk factors were discussed. New mandibular third molar impaction and extraction difficulty degree classification based on anatomical and radiologic findings and literature review results was proposed. The classification proposed here based on anatomical and radiological impacted mandibular third molar features is promising to be a helpful tool for impacted tooth assessment as well as for planning for surgical operation. Further clinical studies should be conducted for new classification validation and reliability evaluation.

  4. A microCT Study of Three-Dimensional Patterns of Biomineralization in Pig Molars

    Directory of Open Access Journals (Sweden)

    Susanna S. Sova

    2018-02-01

    Full Text Available Domestic pig molars provide an interesting system to study the biomineralization process. The large size, thick enamel and complex crown morphology make pig molars relatively similar to human molars. However, compared to human molars, pig molars develop considerably faster. Here we use microCT to image the developing pig molars and to decipher spatial patterns of biomineralization. We used mineral grains to calibrate individual microCT-scans, which allowed an accurate measure of the electron density of the developing molars. The microCT results show that unerupted molars that are morphologically at the same stage of development, can be at markedly different stage of enamel biomineralization. Erupted molars show increased electron density, suggesting that mineralization continues in oral cavity. Yet, our comparisons show that human enamel has slightly higher electron density than pig enamel. These results support the relatively low hardness values and calcium level values that have been reported earlier in literature for pig teeth. The mineral calibration was an efficient method for the microCT-absorption models, allowing a relatively robust way to detect scanning artifacts. In conclusions, whereas thin sections remain the preferred way to analyze enamel features, such as incremental lines and crystal orientation, the microCT allows efficient and non-destructive comparisons between different teeth and species.

  5. Radiographic evaluations of molar intrusion and changes with or without retention in rats.

    Science.gov (United States)

    Choi, Yoon Jeong; Kim, Kyung-Ho; Lee, Kee-Joon; Chung, Chooryung J; Park, Young-Chel

    2011-05-01

    To describe radiographic changes caused by molar intrusion with or without retention methods in rats. Thirty 12-week-old male rats were assigned to six groups (n  =  5 each). Molar intrusion was achieved with an intrusion spring to two maxillary molars for 2 weeks. The control group underwent the same experimental conditions, but without the intrusion spring. The intrusion and control groups were then euthanized. In four groups, the intrusion spring was disengaged after intrusion and the new molar positions were either retained or not with an occlusal bite-block for 1 or 2 weeks. Radiographic changes were measured in the cusp tip, root apices, and alveolar crests. After 2 weeks of intrusion, the cusp tip and root apices had moved apically compared with the control group. However, the alveolar crests were similar in the intrusion and control groups. With retention bite-block, the new position of the intruded cusp tip was maintained, but the root apices had moved occlusally, and the alveolar crest between the two intruded molars had moved apically. Without retention, the cusp tip and root apices had moved occlusally, and the alveolar crest between the intruded molar and unintruded molars had moved occlusally compared with the intrusion group. Rat molars were successfully intruded and maintained at the altered position with retention bite-block. However, the apical root resorption was observed as an instant response. The alveolar crest adjacent to the intruded molars was repositioned apically, but that was a delayed response compared to root resorption.

  6. Virtual prototyping of adhesively restored, endodontically treated molars.

    Science.gov (United States)

    Magne, Pascal

    2010-06-01

    Teeth and dental restorations are difficult to model because of their complex anatomical shape and layered structure. The purpose of this investigation was to describe the use of an efficient virtual prototyping method for the comparison of bonded porcelain and composite resin onlays to restore endodontically treated molars. An intact mandibular molar was digitized with a micro-CT scanner. Surface contours of enamel and dentin were fitted following tooth segmentation based on pixel density using an interactive medical image processing software (Mimics). Standard triangle language files of enamel and dentin surfaces were then exported to a design and meshing software (3-matic). The root filling, base material, and a 3.0-mm-thick onlay were created by merging primitive shapes. Surface splitting, removal of unwanted surfaces, and remeshing allowed generation of an assembly with optimized interfacial mesh congruence and T-junctions. Solid 3-dimensional (3-D) models obtained in a finite element software (Marc/Mentat) were subjected to nonlinear contact analysis to simulate occlusal loading at 200 N and 700 N. Maximum principal stress values were used to calculate the risk of fracture and for validation with existing experimental data. There were similar stress distributions at 200 N (maximum peak values of 24 to 26 MPa) for both restorative materials, but marked differences at 700 N, with the porcelain onlay showing occlusal stress peaks more than 30% higher than composite resin. High stress concentrations were found at 700 N at the root level of the porcelain-restored tooth (95 MPa). For the composite resin onlay, secondary peaks of stress at the 700-N load were found above the cemento-enamel junction (47 MPa) with only minor effects at the root. The risk of fracture was increased for porcelain onlays, which correlated with the existing validation data and the decreased risk of fracture below the cemento-enamel junction (CEJ) observed for composite resin onlays. The

  7. Long-term clinical performance of esthetic primary molar crowns.

    Science.gov (United States)

    Ram, Diana; Fuks, Anna B; Eidelman, Eliecer

    2003-01-01

    The aim of the study was to report the long-term clinical performance of esthetic primary molar crowns and compare them to that of stainless steel crowns (SSC). Twenty crowns (10 conventional and 10 esthetic) placed in 10 children who had participated in a previously reported study, were assessed again after 4 years. The crowns were evaluated clinically and radiographically according to the following parameters: gingival health, marginal extension, crown adequacy, proper occlusion, proximal contact, chipping of the facing (for esthetic crowns only), and cement removal. At the 4 year evaluation, all the esthetic crowns showed chipping of the facing. No difference was found for marginal extension, occlusion, crown adequacy and periodontal health between SSCs and the esthetic crowns. After 4 years, all the esthetic crowns presented chipping of the facing and, consequently, a very poor esthetic appearance.

  8. Indirect pulp capping in primary molar using glass ionomer cements

    Directory of Open Access Journals (Sweden)

    Murtia Metalita

    2014-12-01

    Full Text Available Background: Indirect pulp capping in primary teeth, however, is more rarely conducted than permanent teeth, since it thought to have low impact and most suggestion is for taking caries lesion aggressively on primary teeth. Purpose: The study was aimed to evaluate the subjective complaint, clinical symptom, and radiographic appearance of indirect pulp capping treatment using glass ionomers cements in primary molar. Methods: Sixteen children in range of age 6 to 8 years old, who visited Clinic of Pediatric Dentistry Universitas Airlangga Dental Hospital, Surabaya Indonesia, were the subject of study. They had one occlusal dental caries on one side of maxillary or mandibular primary molar with the diagnose of pulpitis reversible. The experimental group, had indirect pulp capping treatment with glass ionomer cements (GC Fuji VII®, while the control group, had indirect pulp capping treatment with calcium hydroxide (Metapaste. Each group was filled with GC Fuji IX® as permanent restoration. After one week, one month, and three months later, the observations were made on subjective complaint, clinical symptom, and radiographic appearance. Results: The results showed no subjective complaint such as pain or problem on mastication; no negative clinical symptoms such as pain on palpation, gingivitis or periodontitis, and abnormal tooth mobility; no negative radiographic appearance such as pathological apical radioluscency, internal or external resorbtion, and change of ligament periodontal widthafter the treatment. Conclusion: The study suggested that indirect pulp capping treatment using glass ionomer cement materials on primary teeth might be considered to be the treatment choice.Latar belakang: Indirect pulp capping pada gigi sulung lebih jarang dilakukan dibandingkan gigi permanen, karena dianggap memiliki dampak yang rendah dan sebagian besar menyarankan untuk mengambil lesi karies secara agresif pada gigi sulung. Tujuan: Penelitian ini bertujuan

  9. Efficiency of Intraligamentary Anesthesia of Inferior Molars for Endodontic Treatment

    Directory of Open Access Journals (Sweden)

    Peycheva K.

    2014-12-01

    Full Text Available The periodontal ligament injection appears to be the most consistently reliable in achieving clinically adequate pulpal anaesthesia. Materials and Methods: 130 inferior molar teeth; technique: The tooth was first cleaned with chlorhexidine 0.2% solution. The penetration of the ligament is performed with special intraligamentary needle (30 G - 9, 17,21 mm “sliding” along the side of the tooth, 300º angle between the needle and the tooth, having taken the care of determining support points which will prevent the needle from twisting. The penetration must be deep enough to obtain the seal required for the injection, injection for each root in particular points; volume of solution per root is 0.2-0.4 ml. Results: In 125 cases the technique was absolutely efficient. In only 5 cases with pulpitis chronica ulcerosa there was need for additional intrapulpal anesthesia. Conclusions: The method could be used as a primary anesthetic method for endodontic treatment.

  10. Molar Gibbs energy formation of RbUO 3(s)

    Science.gov (United States)

    Jayanthi, K.; Iyer, V. S.; Rama Rao, G. A.; Venugopal, V.

    1996-09-01

    The molar Gibbs energy of formation of RbUO3(s) was determined by measuring the oxygen pressure over the phase field, RbUO3(s) + Rb2U2O7(s) + Rb2UO4(s), using a solid oxide electrolyte galvanic cell in the temperature range 920 to 1100 K and the partial pressure of rubidium using the Knudsen effusion mass loss method in the temperature range 1305 to 1459 K. The oxygen potential and the rubidium potential existing over the phase field can be respectively given by Δμ(O2)±0.4(kJ mol-1) = -531.6+0.2026T(K) and Δμ(Rb)±0.6(kJ mol-1) = -152.7+0.018T(K).

  11. Molar extinction coefficients of some commonly used solvents

    Science.gov (United States)

    Kumar, Ashok; Singh, Sukhpal; Singh Mudahar, Gurmel; Singh Thind, Kulwant

    2006-07-01

    Molar extinction coefficients of some commonly used solvents (ethanol (C 2H 5OH), methanol (CH 3OH), propanol (C 3H 7OH), butanol (C 4H 9OH), water (H 2O), toluene (C 7H 8), benzene (C 6H 6), carbontetrachloride (CCl 4), acetonitrile (C 4H 3N), chlorobenzene (C 6H 5Cl), diethylether (C 4H 10O) and dioxane (C 4H 8O 2)) have been determined by a well-collimated narrow beam transmission geometry at 279, 356, 662, 1173, 1252 and 1332 keV γ rays. The total γ 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.

  12. Appositional enamel growth in molars of South African fossil hominids

    Science.gov (United States)

    Lacruz, Rodrigo S; Bromage, Timothy G

    2006-01-01

    Enamel is formed incrementally by the secretory activity of ameloblast cells. Variable stages of secretion result in the formation of structures known as cross striations along enamel prisms, for which experimental data demonstrate a correspondence with daily periods of secretion. Patterns of variation in this daily growth are important to understanding mechanisms of tooth formation and the development of enamel thickness. Transmitted light microscopy (TLM) of histological ground sections and scanning electron microscopy (SEM) of bulk specimens or their surface replicas are the usual methods for investigating cross striations. However, these methods pose some constraints on the study of these features in Plio-Pleistocene hominid enamel, the specimens of which may only rarely be sectioned for TLM or examined on only their most superficial surfaces for SEM. The recent development of portable confocal scanning optical microscopy (PCSOM) resolves some of the restrictions on fractured enamel surfaces, allowing the visualization of cross striations by direct examination. This technology has been applied here to the study of Australopithecus africanus and Paranthropus robustus hominid molars from the Plio-Pleistocene of South Africa. We hypothesize that these taxa have increased enamel appositional rates compared with modern humans, because despite having thicker enamelled molars (particularly P. robustus), the enamel crowns of these fossil taxa take an equivalent or reduced amount of time to form. Cross striations were measured in cuspal, lateral and cervical regions of the enamel crowns, and, within each region, the inner, middle and outer zones. Values obtained for A. africanus outer zones of the enamel crown are, in general, lower than those for P. robustus, indicating faster forming enamel in the latter, while both taxa show higher rates of enamel growth than modern humans and the African great apes. This demonstrates a relatively high degree of variability in the

  13. Does Psychological Profile Influence Third Molar Extraction and Postoperative Pain?

    Science.gov (United States)

    González-Martínez, Raquel; Jovani-Sancho, María Del Mar; Cortell-Ballester, Isidoro

    2017-03-01

    Our purposes were to determine the influence of psychological profile on hemodynamic changes in patients who undergo surgical removal of the third molars under intravenous sedation and to evaluate the effect on patients' anxiety and postoperative recovery. We performed a prospective study of 100 patients (American Society of Anesthesiologists classes I and II; aged ≥18 years) seen in the CIMIVClinic (Department of Oral Surgery, Casa de Salud University Hospital, Valencia, Spain) who underwent extractions of all third molars under intravenous sedation. All patients were administered the Symptom Checklist 90 Revised (SCL-90-R). The following parameters were monitored at different times during the surgical interventions: systolic blood pressure, diastolic blood pressure, oxygen saturation, and heart rate. Position and depth of impaction of the tooth (Pell and Gregory classification and Winter classification), surgery duration, and surgical technique also were recorded. Finally, the degree of pain experienced the week after the surgical intervention was measured using a visual analog scale. Patients' anxiety levels preoperatively were significantly higher in patients with psychological distress (P = .023). Postoperative pain significantly decreased from the first day to the seventh day in healthy patients but not in patients with altered psychological conditions (P psychological impairment. Intravenous sedation enables the control of hemodynamic changes in all patients independently of their psychological profile. Patients with psychological distress present with higher levels of dental anxiety and postoperative pain. Future studies are needed to further clarify this interaction. Copyright © 2016 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

  14. Hydrocarbon molar water solubility predicts NMDA vs. GABAA receptor modulation.

    Science.gov (United States)

    Brosnan, Robert J; Pham, Trung L

    2014-11-19

    Many anesthetics modulate 3-transmembrane (such as NMDA) and 4-transmembrane (such as GABAA) receptors. Clinical and experimental anesthetics exhibiting receptor family specificity often have low water solubility. We hypothesized that the molar water solubility of a hydrocarbon could be used to predict receptor modulation in vitro. GABAA (α1β2γ2s) or NMDA (NR1/NR2A) receptors were expressed in oocytes and studied using standard two-electrode voltage clamp techniques. Hydrocarbons from 14 different organic functional groups were studied at saturated concentrations, and compounds within each group differed only by the carbon number at the ω-position or within a saturated ring. An effect on GABAA or NMDA receptors was defined as a 10% or greater reversible current change from baseline that was statistically different from zero. Hydrocarbon moieties potentiated GABAA and inhibited NMDA receptor currents with at least some members from each functional group modulating both receptor types. A water solubility cut-off for NMDA receptors occurred at 1.1 mM with a 95% CI = 0.45 to 2.8 mM. NMDA receptor cut-off effects were not well correlated with hydrocarbon chain length or molecular volume. No cut-off was observed for GABAA receptors within the solubility range of hydrocarbons studied. Hydrocarbon modulation of NMDA receptor function exhibits a molar water solubility cut-off. Differences between unrelated receptor cut-off values suggest that the number, affinity, or efficacy of protein-hydrocarbon interactions at these sites likely differ.

  15. Etiology of molar incisor hypomineralization - A systematic review.

    Science.gov (United States)

    Silva, Mihiri J; Scurrah, Katrina J; Craig, Jeffrey M; Manton, David J; Kilpatrick, Nicky

    2016-08-01

    Molar incisor hypomineralization (MIH) is a common developmental dental defect of permanent teeth, which can increase the risk of dental caries, infection and hospitalization. The etiology is currently unclear although prenatal or early childhood health factors are suspected. The aim of this systematic review was to assess the strength of evidence linking etiological factors with MIH. A systematic search was conducted using the Medline and Embase electronic databases for studies investigating environmental etiological factors of MIH. Two reviewers assessed the eligibility of studies. The level of evidence and bias was determined for all eligible studies according to Australian National Health and Medical Research Council guidelines for systematic reviews of etiology and the Newcastle-Ottawa Scale. From a total of 2254 studies identified through electronic and hand searching, 28 were eligible for inclusion. Twenty-five of these investigated MIH and three investigated a related condition in primary teeth, hypomineralized second primary molars (HSPM), and these were analysed separately. A limited number of studies reported significant associations between MIH and pre- and perinatal factors such as maternal illness and medication use in pregnancy, prematurity and birth complications. Early childhood illness was implicated as an etiological factor in MIH in several studies, in particular fever, asthma and pneumonia. The studies investigating HSPM revealed an association with maternal alcohol consumption, infantile fever and ethnicity. However, the validity of these findings is impaired by study design, lack of adjustment for confounders, lack of detail and consistency of exposures investigated and poor reporting. Childhood illness is likely to be associated with MIH. Further prospective studies of the etiology of MIH/HSPM are needed. © 2016 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  16. Fatigue resistance of CAD/CAM resin composite molar crowns.

    Science.gov (United States)

    Shembish, Fatma A; Tong, Hui; Kaizer, Marina; Janal, Malvin N; Thompson, Van P; Opdam, Niek J; Zhang, Yu

    2016-04-01

    To demonstrate the fatigue behavior of CAD/CAM resin composite molar crowns using a mouth-motion step-stress fatigue test. Monolithic leucite-reinforced glass-ceramic crowns were used as a reference. Fully anatomically shaped monolithic resin composite molar crowns (Lava Ultimate, n=24) and leucite reinforced glass-ceramic crowns (IPS Empress CAD, n=24) were fabricated using CAD/CAM systems. Crowns were cemented on aged dentin-like resin composite tooth replicas (Filtek Z100) with resin-based cements (RelyX Ultimate for Lava Ultimate or Multilink Automix for IPS Empress). Three step-stress profiles (aggressive, moderate and mild) were employed for the accelerated sliding-contact mouth-motion fatigue test. Twenty one crowns from each group were randomly distributed among these three profiles (1:2:4). Failure was designated as chip-off or bulk fracture. Optical and electron microscopes were used to examine the occlusal surface and subsurface damages, as well as the material microstructures. The resin composite crowns showed only minor occlusal damage during mouth-motion step-stress fatigue loading up to 1700N. Cross-sectional views revealed contact-induced cone cracks in all specimens, and flexural radial cracks in 2 crowns. Both cone and radial cracks were relatively small compared to the crown thickness. Extending these cracks to the threshold for catastrophic failure would require much higher indentation loads or more loading cycles. In contrast, all of the glass-ceramic crowns fractured, starting at loads of approximately 450N. Monolithic CAD/CAM resin composite crowns endure, with only superficial damage, fatigue loads 3-4 times higher than those causing catastrophic failure in glass-ceramic CAD crowns. Copyright © 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

  17. Circadian rhythms and gene expression during mouse molar tooth development.

    Science.gov (United States)

    Nirvani, Minou; Khuu, Cuong; Utheim, Tor Paaske; Hollingen, Henriette Stavik; Amundsen, Simon Furre; Sand, Lars Peter; Sehic, Amer

    2017-03-01

    Incremental markings in dental enamel suggest that the circadian clock may influence the molecular underpinnings orchestrating enamel formation. The aim of this study was to investigate whether the genes and microRNAs (miRNAs) oscillate in a circadian pattern during tooth and enamel development. Comparative gene and miRNA expression profiling of the first mandibular molar tooth germ isolated at different time-points during the light and night period was performed using microarrays and validated using real-time RT-PCR. Bioinformatic analysis was carried out using Ingenuity Pathway Analysis (IPA), and TargetScan software was used in order to identify computationally predicted miRNA-mRNA target relationships. In total, 439 genes and 32 miRNAs exhibited significantly different (p tooth germs. Genes involved in enamel formation, i.e. Amelx, Ambn, Amtn, and Odam, oscillated in a circadian pattern. Furthermore, the circadian clock genes, in particular Clock and Bmal1, oscillated in mouse molar tooth germ during 24-h intervals. The expression of Clock and Bmal1 was inversely correlated with the expression of miR-182 and miR-141, respectively. MiRNAs, including miR-182 and miR-141, are involved in the control of peripheral circadian rhythms in the developing tooth by regulating the expression of genes coding for circadian transcription factors such as CLOCK and BMAL1. Regulation of circadian rhythms may be important for enamel phenotype, and the morphology of dental enamel may vary between individuals due to differences in circadian profiles.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2005-10-15

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

  19. Effectiveness of a personalized device in the evaluation of mandibular second molar periodontal healing after surgical extraction of adjacent third molar

    National Research Council Canada - National Science Library

    Pippi, Roberto

    2013-01-01

    The primary aim of the present study was to validate the effectiveness of a personalized device able to guide periodontal probing in evaluation of second molar periodontal healing after adjacent third...

  20. Long- and short-term effects of headgear traction with and without the maxillary second molars.

    Science.gov (United States)

    Shpack, Nir; Brosh, Tamar; Mazor, Yoav; Shapinko, Yoav; Davidovitch, Moshe; Sarig, Rachel; Reimann, Susanne; Bourauel, Christoph; Vardimon, Alexander D

    2014-10-01

    A quantitative assessment of maxillary first molar distalization with and without the maxillary second molar (M2) was carried out. Fifty-six cervical headgear patients undergoing fixed appliance orthodontic treatment were divided into 2 groups: before (G - M2) and after (G + M2) eruption of the maxillary second molars (ages, 11.87 ± 1.20, and 13.05 ± 1.55 years, respectively). The tightness of the dental contact point (TDCP) and the space between the second premolar and the maxillary first molar were measured at 6 levels of headgear force (0-15 N) at 3 intervals 6 months apart (T0, T1, T2). Relationships were found between space and TDCP, time, and presence or absence of the maxillary second molar at T1 and T2 (P headgear force. An increase in initial force beyond 6 to 9 N did not significantly increase the initial maxillary first molar distalization. The G - M2 TDCP and space measurements were similar to those of G + M2 at T2 with the eruption of the maxillary second molar. From T0 to T1, maxillary first molar distalization was greater in G - M2. In comparison with our previous headgear-alone study, initial distalization with a fully bonded appliance was reduced by 4-fold. Headgear therapy is more effective before the eruption of the maxillary second molar. Once it erupts, the distalization pace of the maxillary first molar is reduced, but it can nevertheless be pursued at a slower pace when the maxillary second molar is present. Copyright © 2014 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.

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

    Energy Technology Data Exchange (ETDEWEB)

    Finkelman, R.D.; Butler, W.T.

    1985-07-01

    An in vitro model of mineralization was devised in order to study the developmental appearance of dentin gamma-carboxyglutamic acid-containing proteins (DGPs) in relation to the onset of mineralization. Maxillary third molars from 11-day-old rats were cultured with or without fetal calf serum (FCS) as modified from Navia et al. Molars were incubated without radiolabel, or with either /sup 45/CaCl/sub 2/ (5 microCi/ml) for 24 hr at various stages of a ten-day culture period or (/sup 3/H)-leucine (10 microCi/ml) for 24 hr at the eighth day of culture. Molars were lyophilized and extracted with 10% formic acid overnight at 4 degrees C. DGPs in extracts were detected by immunologic and chromatographic techniques; DGPs in molar sections were detected by immunolocalization using indirect immunofluorescence. Molar development was evaluated histologically using the Von Kossa staining technique. Molars cultured with FCS showed histologic evidence for mineralized dentin and enamel and a significant increase in /sup 45/Ca uptake after the sixth day in vitro. Eleven-day-old molars in vivo and molars cultured without FCS showed no evidence of the presence of mineralized tissues. (/sup 3/H)-Leucine-labeled DGPs were isolated and identified by affinity and reversed-phase high-performance liquid chromatography and by gel electrophoresis from both mineralized and unmineralized molars. DGP antigens were localized immunohistochemically using rabbit anti-rat antibodies raised against a highly purified DGP preparation. In the unmineralized molar, antigenicity was seen in odontoblasts but not in predentin matrix, preodontoblasts, or in any other cell type. Antigens in the mineralized molar were localized to odontoblasts and dentin.

  2. New quantitative classification of the anatomical relationship between impacted third molars and the inferior alveolar nerve.

    Science.gov (United States)

    Wang, Wei-Quan; Chen, Michael Y C; Huang, Heng-Li; Fuh, Lih-Jyh; Tsai, Ming-Tzu; Hsu, Jui-Ting

    2015-12-07

    Before extracting impacted lower third molars, dentists must first identify the spatial relationship between the inferior alveolar nerve (IAN) and an impacted lower third molar to prevent nerve injury from the extraction. Nevertheless, the current method for describing the spatial relationship between the IAN and an impacted lower third molar is deficient. Therefore, the objectives of this study were to: (1) evaluate the relative position between impacted lower third molars and the IAN; and (2) investigate the relative position between impacted lower third molars and the IAN by using a cylindrical coordinate system. From the radiology department's database, we selected computed tomography images of 137 lower third molars (from 75 patients) requiring removal and applied a Cartesian coordinate system by using Mimics, a medical imaging software application, to measure the distribution between impacted mandibular third molars and the IAN. In addition, the orientation of the lower third molar to the IAN was also measured, but by using a cylindrical coordinate system with the IAN as the origin. According to the Cartesian coordinate system, most of the IAN runs through the inferior side of the third molar (78.6 %), followed by the lingual side (11.8 %), and the buccal side (8.9 %); only 0.7 % is positioned between the roots. Unlike the Cartesian coordinate system, the cylindrical coordinate system clearly identified the relative position, r and θ, between the IAN and lower third molar. Using the cylindrical coordinate system to present the relationship between the IAN and lower third molar as (r, θ) might provide clinical practitioners with a more explicit and objective description of the relative position of both sites. However, comprehensive research and cautious application of this system remain necessary.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2013-12-15

    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.

  4. Incisor and molar overjet, arch contraction, and molar relationship in the mixed dentition in repaired complete unilateral cleft lip and palate: A qualitative and quantitative appraisal.

    Science.gov (United States)

    Disthaporn, Suteeta; Suri, Sunjay; Ross, Bruce; Tompson, Bryan; Baena, Diogenes; Fisher, David; Lou, Wendy

    2017-07-01

    To compare the mixed dentition incisor and molar overjet, severity of contraction of the dental arch, and the sagittal molar relationship on the cleft side vs the noncleft side in children with repaired complete unilateral cleft of the lip and palate (UCLP). Orthodontic records taken prior to orthodontic preparation for alveolar bone grafting were screened to select study casts from patients with nonsyndromic repaired complete UCLP who did not have mandibular skeletal or dental asymmetry. The study sample comprised dental casts from 74 children aged 8.9 ± 1 years. Standardized digital photographs were acquired at 1:1 magnification. A coordinate system was developed using digital image-processing software (Photoshop CS4 and Adobe Illustrator). Incisor and molar overjet, Angle's classification, and arch contraction were recorded. Descriptive statistics, paired t-tests, and kappa statistics were used to compare the cleft and noncleft sides. A negative overjet of -1 to -5 mm was often present at the incisors, with greater frequency and magnitude on the cleft side. Class II molar relation was more frequent on the cleft side (61.1%) than on the noncleft side (47.2%). Significantly greater contraction of the cleft side deciduous canine and deciduous first molar was noted, while the difference was very minor at the first permanent molar. Cleft side maxillary arch contraction was most severe in the deciduous canine and first deciduous molar region and progressively less severe in the posterior region of the arch. A greater frequency and severity of negative overjet and Class II molar relationship was seen on the cleft side.

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

    Science.gov (United States)

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

    2014-12-01

    A posterior cross-bite is defined as an abnormal bucco-lingual relationship between opposing molars, pre-molars or both in centric occlusion. Although it has been reported that patients with unilateral posterior cross-bite often show unique chewing patterns, the relationship between the form of cross-bite and masticatory jaw movement remains unclear in adult patients. The objective of this study was to investigate masticatory jaw movement among different forms of cross-bite. One hundred and one adults were recruited in this study: 27 had unilateral first molar cross-bite (MC group); 28, unilateral pre-molar cross-bite (PC group); 23, anterior cross-bite (AC group); and 23, normal occlusion (control group). Masticatory jaw movement of the lower incisor point was recorded with six degrees of freedom jaw-tracking system during unilateral mastication. Our results showed that the reverse chewing ratio during deliberate unilateral mastication was significantly larger in the MC group than in the PA (P < 0.001), AC (P < 0.001) and control (P < 0.001) groups. These findings suggest that compared to the anterior or pre-molar cross-bite, the first molar cross-bite is more closely associated with a higher prevalence of a reverse chewing cycle. © 2014 John Wiley & Sons Ltd.

  6. Effect of Eruption Status of the Mandibular Third Molar on Distal Caries in the Adjacent Second Molar.

    Science.gov (United States)

    Kang, Feiwu; Huang, Cheng; Sah, Manoj Kumar; Jiang, Beizhan

    2016-04-01

    To analyze the effect of the eruption status of the mandibular third molar (MTM) on distal caries in the mandibular second molar (MSM) by cone-beam computed tomography (CBCT). Five hundred CBCT images of MTMs from 469 patients were evaluated. Presence of distal caries in MSMs, impaction depths and angulations of MTMs, cementoenamel junction (CEJ) distances between distal MSMs and mesial MTMs, presence of pericoronitis in MTMs, and patient characteristics (age and gender) were assessed. Data were analyzed by χ(2) test, univariate and multivariate logistic regression analyses, and Spearman correlation analysis. Descriptive and bivariate statistics were computed and the P value was set at .05. The overall prevalence of distal caries in the MSM was 52.0%. According to the classification of Pell and Gregory, position A was the impaction depth at which most distal caries in MSMs were present (P = .036). For angulation of the MTM, when mesial angulations were 43° to 73°, MSMs developed more distal caries (P < .0001). For the CEJ distance between the distal MSM and the mesial MTM, when distances ranged from 6 to 15 mm, distal caries in MSMs occurred more frequently (6 to 8 mm, P < .0001; 8 to 15 mm, P = .037). Furthermore, there was a linear correlation between angulation of the MTM and the CEJ distance between the distal MSM and the mesial MTM (P < .0001). Impaction depth and angulation of the MTM are associated with distal caries in the MSM. Angulation of the MTM is more stable and reliable than the CEJ distance between the distal MSM and the mesial MTM for the estimation of risk factors related to the MTM. Copyright © 2016 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

  7. Immediate changes in the mandibular dentition after maxillary molar distalization using headgear.

    Science.gov (United States)

    Kang, Sung-Ja; Kim, Hyun-Hee; Hwang, Hyeon-Shik; Lee, Kyung-Min

    2017-03-01

    The purpose of this study was to investigate immediate changes in the mandibular dentition after maxillary molar distalization using headgear in non-growing patients. Sixteen patients (mean age, 18.9 ± 2.0 years) with Class II molar relationship and crowding were included in the present study. To correct the molar relationship, headgear was used for maxillary molar distalization. Cone-beam computed tomography-generated half-cephalograms (CG Cephs) and dental casts were used to evaluate dental changes for each subject before and immediately after molar distalization using headgear. The mean duration that subjects wore the headgear was 6.3 months. CG Cephs showed that the first maxillary molars were distalized 4.2 ± 1.6 mm with 9.7° ± 6.1° of distal angulation. The intercanine, interpremolar, and intermolar widths of the mandible increased after maxillary molar distalization. The present study's results suggest that maxillary molar distalization using headgear induces a spontaneous response in the untreated mandibular dentition of non-growing patients.

  8. Functional approach to a Class II patient with upper first molar impaction

    Directory of Open Access Journals (Sweden)

    Giacomo D′Orlandi

    2014-01-01

    Full Text Available The lack of the left first molar maxillary and the left second molar maxillary, caused respectively by impaction and agenesis is a very rare case, which determines an important occlusal imbalance and asymmetrical mandible movement. A gnatologic and functional orthodontic approach were planned to improve the retrognathic mandible and the muscular activity using kinesiograph and electromyography.

  9. Success rate of calcium hydroxide pulpotomy in primary molars restored with amalgam and stainless steel crowns

    National Research Council Canada - National Science Library

    Sonmez, D; Duruturk, L

    2010-01-01

    ... in primary molars restored witha stainless steel crown (SSC) to that of teeth restored with amalgam and to evaluate the role of restoration failure in treatment outcome. Study design Pulpotomies were performed in 154 primary molars. Teeth were grouped according to pulpal exposure type as either mechanically or cariously exposed, with cariously e...

  10. Reimbursement rates and policies for primary molar pit-and-fissure sealants across state Medicaid programs.

    Science.gov (United States)

    Chi, Donald L; Singh, Jennifer

    2013-11-01

    Little is known about Medicaid policies regarding reimbursement for placement of sealants on primary molars. The authors identified Medicaid programs that reimbursed dentists for placing primary molar sealants and hypothesized that these programs had higher reimbursement rates than did state programs that did not reimburse for primary molar sealants. The authors obtained Medicaid reimbursement data from online fee schedules and determined whether each state Medicaid program reimbursed for primary molar sealants (no or yes). The outcome measure was the reimbursement rate for permanent tooth sealants (calculated in 2012 U.S. dollars). The authors compared mean reimbursement rates by using the t test (α = .05). Seventeen Medicaid programs reimbursed dentists for placing primary molar sealants (34 percent), and the mean reimbursement rate was $27.57 (range, $16.00 [Maine] to $49.68 [Alaska]). All 50 programs reimbursed dentists for placement of sealants on permanent teeth. The mean reimbursement for permanent tooth sealants was significantly higher in programs that reimbursed for primary molar sealants than in programs that did not ($28.51 and $23.67, respectively; P = .03). Most state Medicaid programs do not reimburse dentists for placing sealants on primary molars, but programs that do so have significantly higher reimbursement rates. Medicaid reimbursement rates are related to dentists' participation in Medicaid and children's dental care use. Reimbursement for placement of sealants on primary molars is a proxy for Medicaid program generosity.

  11. Prevalence of Three-rooted Primary Mandibular First Molars in Taiwan

    Directory of Open Access Journals (Sweden)

    Ming-Gene Tu

    2010-01-01

    Conclusion: The data presented here indicate that approximately 5% of Taiwanese subjects had a three-rooted mandibular primary first molar and 80% of such teeth occurred unilaterally. Dentists should take into account the prevalence of these three-rooted variants in primary mandibular first molars among Taiwanese patients during their daily endodontic and exodontic procedures.

  12. Incidence of impacted mandibular third molars in population of Bosnia and Herzegovina: a retrospective radiographic study

    Directory of Open Access Journals (Sweden)

    Sadeta Šečić

    2013-09-01

    Full Text Available Introduction: Impaction may be defined as the failure of complete eruption into a normal functional position of one tooth within normal time due to lack of space in the dental arch, caused by obstruction byanother tooth or development in an abnormal position. The mandibular third molar is the most frequently impacted tooth. The incidence varies from 9.5% to 68% in different populations.Methods: The study was conducted in Department of Oral Surgery, Faculty of Dentistry, University in Sarajevo. Study represents retrospective analysis of panoramic radiographs (orthopantomograms of patientsreferred to Department of Oral Surgery from January 2010 to February 2013 with indication for surgical removal of impacted third molars.Results: Of the 2000 radiographs, 761 presented with at least one impacted third molar (38%. A total of 1034 impacted mandibular third molars were present (51.7%. The most common age group was thirddecade (61.2%. Signifi cant statistical difference in incidence of third molar impaction was found between females and males (ppopulation (p=0.374. Vertical angulation was the most common pattern of impaction (65%. Frequency of third molars erupted into their normal position (class IA was 42%. Impacted mandibular molars wereassociated with periodontal pockets in 134 (6.5% cases and with dentigerous cysts in 5 cases (0.2%.Conclusion: The present study provides useful data regarding the clinical status of third molars in population of Bosnia and Herzegovina.

  13. Incidence of impacted mandibular third molars in population of Bosnia and Herzegovina: a retrospective radiographic study

    Directory of Open Access Journals (Sweden)

    Sadeta Šečić

    2013-09-01

    Full Text Available Introduction: Impaction may be defined as the failure of complete eruption into a normal functional position of one tooth within normal time due to lack of space in the dental arch, caused by obstruction byanother tooth or development in an abnormal position. The mandibular third molar is the most frequently impacted tooth. The incidence varies from 9.5% to 68% in different populations.Methods: The study was conducted in Department of Oral Surgery, Faculty of Dentistry, University in Sarajevo. Study represents retrospective analysis of panoramic radiographs (orthopantomograms of patientsreferred to Department of Oral Surgery from January 2010 to February 2013 with indication for surgical removal of impacted third molars.Results: Of the 2000 radiographs, 761 presented with at least one impacted third molar (38%. A total of 1034 impacted mandibular third molars were present (51.7%. The most common age group was thirddecade (61.2%. Signifi cant statistical difference in incidence of third molar impaction was found between females and males (p<0.05, but there was no statistical difference in incidence in urban and suburbanpopulation (p=0.374. Vertical angulation was the most common pattern of impaction (65%. Frequency of third molars erupted into their normal position (class IA was 42%. Impacted mandibular molars wereassociated with periodontal pockets in 134 (6.5% cases and with dentigerous cysts in 5 cases (0.2%.Conclusion: The present study provides useful data regarding the clinical status of third molars in population of Bosnia and Herzegovina.

  14. Hypomineralized second primary molars: Prevalence data in Dutch 5-year-olds

    NARCIS (Netherlands)

    Elfrink, M.E.C.; Schuller, A.A.; Weerheijm, K.L.; Veerkamp, J.S.J.

    2008-01-01

    The aim of this cross-sectional observational study was to report on the prevalence of hypomineralizations in second primary molars in 5-year-old Dutch children. In the study 386 (45% girls) 5-year-old Dutch children, all insured by a Health Insurance Fund, participated. Scoring criteria for molar

  15. Mandibular impacted third molar Surgery and Drains: a review of the ...

    African Journals Online (AJOL)

    Oral surgeons have used drains after the surgical removal of mandibular impacted third molars to minimize postoperative morbidity with varying degrees of success. The use of a drain in association with primary suture after the surgical removal of the impacted lower third molars allows the patient to experience a more ...

  16. Exfoliation rates of primary molars submitted to three treatment protocols after 3.5 years.

    NARCIS (Netherlands)

    Mijan, M.C.; Amorim, R.G. de; Mulder, J.; Frencken, J.E.F.M.; Leal, S.C.

    2015-01-01

    OBJECTIVE: The aim of the study was to evaluate the exfoliation pattern of primary molars treated according to three treatment protocols. The hypothesis tested was that there is no difference in the exfoliation pattern of primary molars treated according to conventional restorative treatment using

  17. A new method to correct lingual rolling of lower molars (Amini twister).

    Science.gov (United States)

    Amini, Fariborz; Poosti, Maryam

    2013-01-01

    In this report, we present an uncomplicated approach to overcome lingual rolling of mandibular molars during orthodontic treatment, by using rectangular NiTi arch wire in twist fashion through the molar tube. The sequential steps of the twist manoeuvre on a typodont and a case report are exhibited in this article.

  18. Using cone beam computed thomography in planning the extraction of impacted third molars

    Directory of Open Access Journals (Sweden)

    Vlahović Zoran

    2016-01-01

    Full Text Available The panoramic radiography is the most used diagnostic imaging method in planning impacted lower third molar extractions. However, often panoramic radiography does not provide enough information in treatment planning for performing safely surgical extraction of impacted third molars. CBCT (Cone beam computed tomography provides more precise information in diagnostic analysis especially for planning surgical procedures where complications can be expected due to close relationship between mandibular canal and lower impacted third molars. The aim of this study is comparative analysis of panoramic radiography and CBCT in evaluating the topographic relationship between mandibular canal and impacted third molars. The study included 50 patients with close relationship between mandibular canal and impacted third molars detected using panoramic radiography. After panoramic radiography analysis CBCT was performed in order to diagnose, plan and prevent complications during the surgical tooth extraction. CBCT examination considered comparative analysis with panoramic radiography, marking, volume rendering and assessment of mandibular canal in buccolingual direction. Out of total patients where suprimposition of mandibular canal and impacted third molar on panoramic radiography was detected, in 32 patients mandibular chanal was localised on lingual side. Mandibular canal was positioned at bucal side in 18 of 50 patients. Results of this research indicate that panoramic radiography can be useful in everyday practice for diagnosis, planning and preparing lower third molar extractions, but in cases where close relationship between mandibular canal and lower third molars is detected CBCT is recommended as more precise radiographic imaging method in order to prevent complications.

  19. Molar mass determination of lignins by size-exclusion chromatography: towards standardisation of the method

    NARCIS (Netherlands)

    Baumberger, S.; Abaecherli, A.; Fasching, M.; Gellerstedt, G.; Gosselink, R.J.A.; Hortling, B.; Li, J.; Saake, B.; Jong, de E.

    2007-01-01

    The reactivity and physicochemical properties of lignins are partly governed by their molar mass distribution. The development of reliable standard methods for determination of the molar mass distribution is not only relevant for designing technical lignins for specific applications, but also for

  20. A study on the survival of primary molars with intact and with defective restorations

    NARCIS (Netherlands)

    Hilgert, L.A.; Frencken, J.E.F.M.; Amorim, R.G. de; Mulder, J.; Leal, S.C.

    2016-01-01

    BACKGROUND: Failed restorations in primary teeth are not always re-restored. Is re-restoration not required anymore? OBJECTIVE: To compare survival rates of primary molars with intact and defective amalgam and ART restorations. METHODS: A total of 649 restored primary molars, of which 162 were

  1. The shifting of the molar row with regard to the orbit in Equus and Giraffa

    NARCIS (Netherlands)

    Willemse, M.C.A.

    1950-01-01

    The difference in shape and in function of the postorbital bar in horse and giraffe has been pointed out by Marinelli (1933, pp. 201-222). In Giraffa the molar row extends to below the orbit. The pressure exercised on the molars by the musculus temporalis is diverted principally along the

  2. Management of pain after third molar surgery: a review of literature ...

    African Journals Online (AJOL)

    Background: Pain has been identified as the most common cause of postoperative morbidity after the surgical removal of impacted lower third molars which could be severe enough to affect the patients' daily life. Several studies have been done on impacted mandibular third molars in developed countries, where several ...

  3. Effect of lower third molars on the incidence of mandibular angle and condylar fractures.

    Science.gov (United States)

    Choi, Byung-Joon; Park, Soong; Lee, Deok-Won; Ohe, Joo-Young; Kwon, Yong-Dae

    2011-07-01

    Numerous previous studies already have proven that mandibles with a third molar are significantly more susceptible to angle fracture by external force. Similarly, other data suggest that the absence of a third molar increases the risk of condylar fracture, while concurrently decreasing the risk of angular fracture. We attempt to characterize the effect of a third molar on the incidence of mandibular angle and condylar fractures. This retrospective study reviews data from 385 patients, all of whom were seen in our clinics between February 2006 and November 2009. All data were collected from clinical examination notes and panoramic radiographs, with third-molar state evaluated by the Pell and Gregory classification system. Our results mirror those of previous studies. The incidence of mandibular angle fracture was significantly greater on sides with a third molar, whereas the condylar fracture rate significantly increased in mandibles lacking a third molar or without a fully erupted third molar. The rate of symphysis and mandibular angle fracture was also high in cases of multiple comorbid fractures. Both the presence and the state of the lower third molar affect the risk of future mandibular angle and condylar fracture.

  4. Radiological age estimation: based on third molar mineralization and eruption in Turkish children and young adults.

    Science.gov (United States)

    Karadayi, Beytullah; Kaya, Ahsen; Kolusayın, Melek Ozlem; Karadayi, Sükriye; Afsin, Hüseyin; Ozaslan, Abdi

    2012-11-01

    Radiographic evaluation of mineralization and eruption stages of third molars using dental panoramic radiographies can be an efficient tool for chronological age estimation in both forensic sciences and legal medicine. The third molar tooth is utilized for dental age estimation about the age span of 15-23 years because it represents the only tooth still in development. The aim of this study is to obtain and analyze data regarding third molar development and eruption in Turkish population for dental age estimation. A total of 744 dental panoramic radiographies of 394 female and 350 male subjects aged between 8 and 22 years were examined. Third molar development was determined according to the Nolla classification system, and eruption was assessed relative to the alveolar bone level. Mandibular and maxillary third molars were generally found at similar stages of development on both sides. Nolla stage 6 (completed crown calcification) was reached at around the age of 15 in both maxillary and mandibular third molars in both sexes. Alveolar emergence was at around the age of 16 in males and around age of 17 in females. Although third molars' eruption shows greater variability than development of third molars, data which were obtained from this study about eruption of these teeth can be supportive to development data for age estimation.

  5. Morphology and chemical composition of dentin in permanent first molars with the diagnose MIH

    NARCIS (Netherlands)

    Heijs, Suzanne C. B.; Dietz, Wolfram; Noren, Jorgen G.; Blanksma, Nynke G.; Jalevik, Birgitta

    2007-01-01

    The purpose of this investigation was to study the morphology and distribution of some inorganic elements in dentin in first permanent molars from children with Molar-Incisor Hypomineralization (MIH). Sixty four tooth sections from thirty two children were examined in polarized light. Fifteen

  6. Molar mass of poly(ethylene terephthalate) (PET) during ultimate uniaxial drawing

    NARCIS (Netherlands)

    Göschel, U.; Cools, P.J.C.H.

    2000-01-01

    The changes of the average molar mass Mw, Mn, Mz, and molar mass distributions during multistep uniaxial drawing of poly(ethylene terephthalate) (PET) to achieve ultimate mechanical properties have been studied in detail by means of size exclusion chromatography (SEC) with triple detection:

  7. Indications for surgical extraction of third molars: a hospital-base ...

    African Journals Online (AJOL)

    A Emil Abdulai

    2014-08-09

    Aug 9, 2014 ... Conclusion: The main reason for surgical extraction of impacted third molars was recurrent pericoronitis, occurring mostly in a relatively younger age group; followed by dental caries then prophylactic surgical extraction. Key words: Third molar, indication, surgical extraction, pericoronitis, dental caries ...

  8. Micro-CT analyses of apical enlargement and molar root canal complexity

    DEFF Research Database (Denmark)

    Markvart, Merete; Darvann, Tron Andre; Larsen, Per

    2012-01-01

    AIM: To compare the effectiveness of two rotary hybrid instrumentation techniques with focus on apical enlargement in molar teeth and to quantify and visualize spatial details of instrumentation efficacy in root canals of different complexity. METHODOLOGY: Maxillary and mandibular molar teeth wer...

  9. Ab initio calculations of partial molar properties in the single-site approximation

    DEFF Research Database (Denmark)

    Ruban, Andrei; Skriver, Hans Lomholt

    1997-01-01

    We discuss the application of the single-site approximation in calculations of partial molar quantities, e.g., impurity solution energy, segregation energy, and effective chemical potential, which are related to a variation of the composition of an alloy or its nonequivalent parts. We demonstrate...... properly applied in calculations of partial molar quantities....

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

    NARCIS (Netherlands)

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

    2003-01-01

    An overview of the effects of phase separation of aqueous mixtures of gelatin and dextran on the fractionation in molar mass of these two components is given. Molar mass distributions in coexisting phases were investigated using size exclusion chromatography with multiangle laser light scattering.

  11. A comparative study of the effect of different third molar impactions ...

    African Journals Online (AJOL)

    Background: The surgical removal of impacted lower third molar is one of the most frequently performed procedures in oral and maxillofacial surgery and represents a standard operation. Patients' complaints of pain, swelling and limitation in mouth opening associated with inflammatory response following lower third molar ...

  12. Therapeutic decisions in the presence of decayed permanent first molars in young subjects: a descriptive inquiry.

    Science.gov (United States)

    Sayagh, Millewa; Maniere-Ezvan, Armelle; Vernet, Cindy; Muller-Bolla, Michèle

    2012-09-01

    The aim of this exhaustive descriptive epidemiological study was to determine the clinical approach to be adopted by practitioners specializing exclusively in pediatric odontology and by orthodontists when confronted with decayed molars in children and adolescents. A questionnaire was sent out to all corresponding practitioners (n=2076). Six questions related to treatment decisions taken when faced with decayed permanent first molars (unfavorable short or middle-term prognosis) in patients needing, or not, orthodontic care. The Chi(2) test was used to compare responses. Thirty-eight per cent of pedodontists (n=38) and 12.5% (n=246) of orthodontists answered the questionnaire. Faced with a permanent first molar with an unfavorable middle-term prognosis, 75.7% needed criteria to help them reach their treatment decision. In decreasing order of importance, these criteria were: presence of the third molar, patient motivation, inter-arch relationship, patient's oral hygiene, facial type, anterior jaw-teeth discrepancy and the number of molars to be extracted. Faced with a permanent first molar requiring extraction and when orthodontic treatment was not required, 31.7% of practitioners decided to close the maxillary space immediately as opposed to 13.4% who closed the space at the mandible. In the presence of a single decayed first molar, 68.7% of practitioners did not extract the antagonist or contralateral first molars. These treatment decisions were not always unanimous and call for a combined approach between dental surgeon and orthodontist. Copyright © 2012. Published by Elsevier Masson SAS.

  13. The analgesic efficacy of intravenous versus oral tramadol for preventing postoperative pain after third molar surgery

    NARCIS (Netherlands)

    Ong, Cliff K. S.; Lirk, Phillip; Tan, Juliana M. H.; Sow, Belle W. Y.

    2005-01-01

    The aim of this study was to compare the analgesic efficacy of single-dose preoperative intravenous versus oral tramadol for preventing pain after third molar surgery. Seventy-two patients undergoing elective third molar surgery were randomized to receive either intravenous (n = 36) or oral (n = 36)

  14. Comparison of Primary Molar Crown Dimensions with Stainless Steel Crowns in a Sample of Iranian Children

    Science.gov (United States)

    Afshar, Hossein; Kamali Sabeti, Arghavan; Shahrabi, Mahdi

    2015-01-01

    Background and aims. Due to anatomic variation in tooth anatomy between populations, this study compared the buccolingual (BL) and mesiodistal (MD) dimensions of primary molars with those of stainless steel crowns (SSCs) in anIranian population. Materials and methods. Impressions were taken from both dental arches of children, and casts were poured. Teeth with caries, restoration, hypoplasia or other dental anomalies were excluded. 216 primary molars were selected and divided into 4 groups of 54 each (maxillary and mandibular first and second primary molars). MD/BL dimensions were measured using a digital caliper with 0.01 mm precision on casts and SCCs (3M brand). Data were assessed using paired t-test, post hoc test and ANOVA. P < 0.05 was considered statistically significant. Results. The MD dimension of the lower first molar SSC and the BL dimension of the lower second molar SSC had the least difference with the corresponding values of the respective teeth. The MD dimension of the upper second molar SSC and the BL dimension of the upper first molar SSC had the greatest difference with the corresponding values in the respective teeth. Comparison of the two different brands of SSCs for the upper first molar revealed that both types had significant differences with the teeth in terms of both MD (P = 0.0) and BL (P = 0.0) dimensions. Conclusion. In the studied population, best adaptation was seen in second lower molars and the least adaptationswere seen in first and second upper molars. PMID:26236433

  15. Comparison of Primary Molar Crown Dimensions with Stainless Steel Crowns in a Sample of Iranian Children

    Directory of Open Access Journals (Sweden)

    Hossein Afshar

    2015-06-01

    Full Text Available Background and aims. Due to anatomic variation in tooth anatomy between populations, this study compared the buccolingual (BL and mesiodistal (MD dimensions of primary molars with those of stainless steel crowns (SSCs in anIranian population. Materials and methods. Impressions were taken from both dental arches of children, and casts were poured. Teeth with caries, restoration, hypoplasia or other dental anomalies were excluded. 216 primary molars were selected and divided into 4 groups of 54 each (maxillary and mandibular first and second primary molars. MD/BL dimensions were measured using a digital caliper with 0.01 mm precision on casts and SCCs (3M brand. Data were assessed using paired t-test, post hoc test and ANOVA. P < 0.05 was considered statistically significant. Results. The MD dimension of the lower first molar SSC and the BL dimension of the lower second molar SSC had the least difference with the corresponding values of the respective teeth. The MD dimension of the upper second molar SSC and the BL dimension of the upper first molar SSC had the greatest difference with the corresponding values in the respective teeth. Comparison of the two different brands of SSCs for the upper first molar revealed that both types had significant differences with the teeth in terms of both MD (P = 0.0 and BL (P = 0.0 dimensions. Conclusion. In the studied population, best adaptation was seen in second lower molars and the least adaptationswere seen in first and second upper molars.

  16. Maxillary molar distalization with the indirect Palatal miniscrew for Anchorage and Distalization Appliance (iPANDA).

    Science.gov (United States)

    Suzuki, Eduardo Yugo; Suzuki, Boonsiva

    2013-01-01

    Distalization of the maxillary molars is an important treatment option for the correction of Class II malocclusions. The purposes of this study were to introduce the clinical application of the indirect Palatal miniscrew Anchorage and Distalization Appliance (iPanda) and to describe the dental and skeletal effects obtained with this innovative appliance. Pretreatment (TO), post-distalization (T1), and posttreatment (T2) lateral cephalometric radiographs and dental casts of 20 consecutively treated adult patients (mean age 23.2 ± 4.7 years) with Class II molar relationship were analyzed. All patients were treated with the iPanda for maxillary molar distalization. The iPanda was anchored on a pair of midpalatal miniscrew implants to deliver the distalizing force to the maxillary first molars. The iPanda was the only appliance used during the distalization phase of treatment. A paired t test analysis was used to statistically assess the effects of treatment. A Class I molar relationship was obtained in a mean period of 3.2 ± 0.6 months. Cephalometric analysis demonstrated that the maxillary first molars were significantly distalized by an average 4.5 ± 1.5 mm (P mandibular plane was observed. Dental model analysis demonstrated an asymmetric pattern of distalization between right (4.5 ± 2.2 mm) and left (3.1 ± 2.1 mm) first molars. The transverse width of the dental arch was maintained. No significant rotation of the first molars was observed. This study demonstrated that the innovative iPanda is effective to bodily distalize the maxillary molars into a Class I molar relationship and to provide maximum anchorage.

  17. Ipsilateral Molar Clenching Induces Less Pain and Discomfort than Contralateral Molar Clenching in Patients with Unilateral Anterior Disc Displacement of the Temporomandibular Joint.

    Science.gov (United States)

    Kumazaki, Yohei; Kawakami, Shigehisa; Hirata, Atsutoshi; Oki, Kazuhiro; Minagi, Shogo

    To assess the influence of clenching side and location (ie, tooth) on the bite force necessary to induce pain or discomfort in patients with unilateral anterior disc displacement (ADD) of the temporomandibular joint (TMJ). A total of 17 patients with unilateral ADD diagnosed clinically and with magnetic resonance imaging were included. A bite force meter was positioned at each of four experimental positions: the mandibular first premolars and first molars, bilaterally. Subjects were instructed to clench on the bite force meter until they felt pain or discomfort in the orofacial area and to report the location of the pain. Differences in pain location (ADD side versus contralateral side) and in the bite force thresholds for eliciting pain or discomfort were assessed by means of the paired t test and Wilcoxon signed-rank test. Only 18% of subjects (3 out of 17) reported pain in the TMJ with ADD during clenching at the ipsilateral molar, whereas 65% (11 out of 17) reported joint pain during clenching on the contralateral molar (P = .005). At the molars, the mean ± standard deviation bite force necessary to induce pain was 241.2 ± 135.5 N on the side with ADD and 160.9 ± 78.0 N on the contralateral side. The mean molar bite force necessary to induce pain on the side with ADD was significantly higher than that on the contralateral side (P = .002). Patients with unilateral ADD had fewer reports of TMJ pain and discomfort when they were molar clenching on the ipsilateral side compared to molar clenching on the contralateral side.

  18. Management of middle mesial canal in mandibular second molar

    Directory of Open Access Journals (Sweden)

    J V Karunakaran

    2012-01-01

    Full Text Available The primary objective of endodontic therapy is to achieve a three-dimensional obturation of the root canal space after adequate preparation of the canal space to remove the tissue debris, microorganisms, and their byproducts. Anatomical variations have frequently been encountered in endodontic practice and have to be adequately managed by the clinician. Missed roots and canals are a major reason for failure of therapy. Technological advances have given the clinician ample opportunity to identify and treat these aberrations successfully. The present report describes a left mandibular second permanent molar requiring root canal treatment, found to have three separate canals in the mesial root. This case demonstrates a rare anatomical configuration and emphasizes the need for the clinician to be aware of and look out for such variations and use adequate diagnostic methodologies prior to and during therapy to detect such variations. The possibility of additional canals, whenever in doubt, should be explored with the assistance of technologies such as those of magnification and illumination and various diagnostic aids. Operator experience has also shown to be a key factor in negotiation and management of these aberrant canal configurations.

  19. Variability of Australopithecus second maxillary molars from Sterkfontein Member 4.

    Science.gov (United States)

    Fornai, Cinzia; Bookstein, Fred L; Weber, Gerhard W

    2015-08-01

    The question of how many Australopithecus species lived at Sterkfontein Member 4 and Makapansgat continues to be controversial inasmuch as the fossils are poorly preserved, the stratigraphy is difficult to interpret, and the cranial, dental, and postcranial remains are mostly not associated. To proceed we applied the most intensive modern methods of 3D geometric morphometrics to dental form, specifically the shapes of the upper second molars (M(2)s) in a sample combining 13 Australopithecus, 11 Paranthropus, and 23 Homo. We analyzed outer and inner crown surfaces, as well as crown and cervical outlines both separately and together, using a total of 16 landmarks, 51 curve semilandmarks, and 48 pseudolandmarks over the four structures. Outer and inner enamel surfaces are highly correlated in this dataset, while crown outline is the least informative of the four structures. Homo was easily distinguished from both Australopithecus and Paranthropus by these methods, likewise Homo sapiens from Homo neanderthalensis. There were, however, no stable classes within the Australopithecus sample or between Australopithecus and Paranthropus. Instead, there was a gradient along which Australopithecus prometheus and Australopithecus africanus lie toward the extremes, with Paranthropus overlapping both. If there are indeed different species at this site, then either their M(2) morphologies are uninformative or else the present sample is too small to make an accurate assessment. Our findings suggest that the variability of the Australopithecus specimens will be difficult to interpret authoritatively, independent of the method used. Copyright © 2015 Elsevier Ltd. All rights reserved.

  20. La hiperdontia en región de molares

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    George Táccio de Miranda Candeiro

    2011-12-01

    Full Text Available La hiperdontia constituye una de las anomalías más estudiadas de la dentición humana. Esa alteración representa la aparición de uno o más dientes en cantidades mayores de lo normal, que puede ocurrir en la mandíbula o maxila y de manera unilateral o bilateral. La etiología de los dientes supernumerarios puede ser explicada principalmente por hiperactividad de la lámina dentaria en la fase inicial. Es importante la detección precoz de dientes supernumerarios porque se ha visto una serie de complicaciones como los diastemas, que pueden causar en la cavidad bucal: retardo de la erupción o dientes impactados, posicionamiento inadecuado de dientes permanentes, desajuste oclusal y el desarrollo de quistes y tumores odontógenos. Así el diagnóstico es normalmente realizado a partir de un examen radiográfico convencional, principalmente la radiografía panorámica. Este trabajo tuvo como objetivo relatar 4 casos clínicos de pacientes con presencia de molares supernumerarios, que fueron atendidos en el Servicio de Radiología de la Escuela de Odontología de la Universidad Federal de Ceará.

  1. Use of opioid pain relievers following extraction of third molars.

    Science.gov (United States)

    Weiland, Breanna M; Wach, Anthony G; Kanar, Brent P; Castele, Matthew T; Sosovicka, Mark F; Cooke, Matthew R; Moore, Paul A

    2015-02-01

    Following extraction of third molars, it is common practice for oral and maxillofacial surgeons to provide a prescription for an opioid-containing analgesic such as hydrocodone with acetaminophen. Because the instructions for use most often indicate that these analgesics are to be taken "as needed for pain," it is unknown how many of the prescribed postoperative analgesic tablets are needed and actually taken. Therefore, an assessment of patient pain experiences and actual opioid analgesic usage was carried out using structured telephone interviews of patients performed 1 and 7 days following their thirdmolar extraction surgery. Forty-eight adolescents and young adults, ages 15 to 30 years, participated in this assessment. A review of the surgeon's notes indicated that the median number of prescribed opioid-containing analgesics (ie, Vicodin®, Norco®, Lorcet®, Percocet®) was 20 tablets (range 10 to 40). The median consumption during the first 24 hours was reported to be three tablets (range 0 to 10), and the total consumption for all 7 days was eight tablets (range 0 to 34). Four patients reported nausea or vomiting in the first 24 hours, and six patients reported nausea or vomiting during the following 6 days of recovery. The initial prescriptions provided adequate relief for 45 of the 48 patients. Higher consumption of opioid pain relievers (OPRs) was associated with a longer duration of surgery and the occurrence of postoperative infections.

  2. Fracture resistance of monolithic zirconia molar crowns with reduced thickness.

    Science.gov (United States)

    Nakamura, Keisuke; Harada, Akio; Inagaki, Ryoichi; Kanno, Taro; Niwano, Yoshimi; Milleding, Percy; Örtengren, Ulf

    2015-01-01

    The purpose of the present study was to analyze the relationship between fracture load of monolithic zirconia crowns and axial/occlusal thickness and to evaluate the fracture resistance of monolithic zirconia crowns with reduced thickness in comparison with that of monolithic lithium disilicate crowns with regular thickness. Monolithic zirconia crowns (Lava Plus Zirconia, 3M/ESPE) with specified axial/occlusal thicknesses and lithium disilicate crowns (IPS e.max press, Ivoclar/Vivadent) with regular thickness were fabricated using a dental CAD/CAM system and a press technique, respectively. The crowns cemented onto dies were loaded until fracture. Based on measurements of the crown thickness made by micro-CT and the fracture load, multiple regression analysis was performed. It was revealed that the occlusal thickness significantly affected the fracture load (p zirconia crowns, the fracture load of the zirconia crowns with the occlusal thickness of 0.5 mm (5558 ± 522 N) was significantly higher than that of lithium disilicate crowns with an occlusal thickness of 1.5 mm (3147 ± 409 N). Within the limitations of the present study, it is suggested that monolithic zirconia crown with chamfer width of 0.5 mm and occlusal thickness of 0.5 mm can be used in the molar region in terms of fracture resistance.

  3. Biodentine Pulpotomy in Mature Permanent Molar: A Case Report.

    Science.gov (United States)

    Soni, Harleen Kaur

    2016-07-01

    Irreversible pulpitis is the most common reason for endodontic treatment in primary and permanent teeth. Root canal therapy and extraction are the two viable and most documented treatment options for the same. Studies with regards to management of mature permanent teeth with carious exposure and treatment with vital pulp therapies such as adult permanent tooth pulpotomy are scarce. However, permanent tooth pulpotomy with the new calcium-silicate based cements (Mineral Trioxide Aggregate and Biodentine) can help preserve the tooth pulp vitality and promote healing and repair foregoing the more invasive root canal therapy procedure. A 12-year old male patient with irreversible pulpitis in right mandibular first permanent molar was treated with complete coronal pulpotomy with placement of Biodentine in the pulp chamber and a full coronal coverage using stainless steel crown. Clinical and radiographic examinations were performed at three, six, twelve and eighteen months. At the end of 18 months, the patient was completely asymptomatic and the tooth was free of any clinical and radiographic signs of inflammation and infection.

  4. Prediction of Molar Volumes of the Sudanese Reservoir Fluids

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    A. A. Rabah

    2010-01-01

    Full Text Available This paper provided important experimental PVT data of the Sudanese reservoir fluids. It includes composition analysis of 11 mixtures and about 148 PVT data points of constant mass expansion (CME tests at pressures below the bubble point. The datasets are compared with eight equations of state (EOS, namely, Peng Robinson (PR, Soave-Redlich-Kwong (SRK, Lawal-Lake-Silberberg (LLS, Adachi-Lu-Sugie (ALS, Schmidt-Wenzel (SW, Patel-Teja (PT, Modified-Nasrifar-Moshfeghian (MNM, and Harmens-Knapp (HK. The results of comparison reveals that, with the exception of PR and ALS EOSs, all other EOSs yield consistently a higher average absolute percent deviation (AAPD in the prediction of molar volume; it exceeds 20% by all mixtures. The grand average AAPD of all mixtures is 17 and 16 for PR and ALS, respectively. ALS is selected to represents the mixtures. It is modified by replacing the coefficient (Ωb1 of the parameter (b1 in the dominator of repulsive term by that of PR. This procedure enhanced the accuracy of ALS by 30 to 90% for individual mixtures and the grand average AAPD is significantly reduced from 16 to about 7.

  5. Experience versus complication rate in third molar surgery

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    Al-Khawalde Mohammed

    2006-05-01

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

  6. Inter-relations between infraocclusion of primary mandibular molars, tipping of adjacent teeth, and alveolar bone height.

    Science.gov (United States)

    Peretz, Benjamin; Absawi-Huri, Mervat; Bercovich, Roly; Amir, Erica

    2013-01-01

    The purpose of this study was to examine inter-relations between infraocclusion of primary mandibular molars, tipping of adjacent teeth, and alveolar bone height of infraoccluded teeth. A total of 402 periapical radiographs of infraoccluded primary mandibular molars were reviewed. Infraocclusion, alveolar bone height, and tipping of adjacent teeth were measured. Infraocclusion was most prevalent among primary mandibular first molars. The amount of infraocclusion was most profound among primary mandibular second molars (2.79±1.25). The shortest distal alveolar crest (reflected by the highest distance between the cementoenamel junction and bone crest) was observed among infraoccluded primary mandibular first molars (0.9±0.92). The permanent mandibular first molar and the primary mandibular first molar demonstrated the maximum tipping mesially and distally. Infraocclusion of primary mandibular molars, tipping of adjacent teeth, and alveolar bone height of the infraoccluded teeth are inter-related.

  7. Development of the first permanent mandibular molar in young children with unilateral complete cleft lip and palate (UCCLP)

    DEFF Research Database (Denmark)

    Hermann, Nuno Vibe; Darvann, Tron A; Kreiborg, Sven

    Development of the first permanent mandibular molar in young children with unilateral complete cleft lip and palate (UCCLP)......Development of the first permanent mandibular molar in young children with unilateral complete cleft lip and palate (UCCLP)...

  8. Absorption of Nickel, Chromium, and Iron by the Root Surface of Primary Molars Covered with Stainless Steel Crowns

    OpenAIRE

    Keinan, David; Mass, Eliyahu; Zilberman, Uri

    2010-01-01

    Objective. The purpose of this study was to analyze the absorption of metal ions released from stainless steel crowns by root surface of primary molars. Study Design. Laboratory research: The study included 34 primary molars, exfoliated or extracted during routine dental treatment. 17 molars were covered with stainless-steel crowns for more than two years and compared to 17 intact primary molars. Chemical content of the mesial or distal root surface, 1 mm apically to the crown or the cemento-...

  9. Impacted Mandibular Third Molars: Review of Literature and a Proposal of a Combined Clinical and Radiological Classification

    OpenAIRE

    Santosh, P.

    2015-01-01

    Tooth impaction is a pathological situation where a tooth fails to attain its normal functional position. Impacted third molars are commonly encountered in routine dental practice. The impaction rate is higher for third molars when compared with other teeth. The mandibular third molar impaction is said to be due to the inadequate space between the distal of the second mandibular molar and the anterior border of the ascending ramus of the mandible. Impacted teeth may remain asymptomatic or may...

  10. Enamel-dentine junction (EDJ) morphology distinguishes the lower molars of Australopithecus africanus and Paranthropus robustus.

    Science.gov (United States)

    Skinner, Matthew M; Gunz, Philipp; Wood, Bernard A; Hublin, Jean-Jacques

    2008-12-01

    Tooth crown morphology plays a central role in hominin systematics, but the removal of the original outer enamel surface by dental attrition often eliminates from consideration the type of detailed crown morphology that has been shown to discriminate among hominin taxa. This reduces the size of samples available for study. The enamel-dentine junction (EDJ) is the developmental precursor and primary contributor to the morphology of the unworn outer enamel surface, and its morphology is only affected after considerable attrition. In this paper, we explore whether the form of the EDJ can be used to distinguish between the mandibular molars of two southern African fossil hominins: Paranthropus (or Australopithecus) robustus and Australopithecus africanus. After micro-computed tomographic scanning the molar sample, we made high-resolution images of the EDJ and used geometric morphometrics to compare EDJ shape differences between species, in addition to documenting metameric variation along the molar row within each species. Landmarks were collected along the marginal ridge that runs between adjacent dentine horns and around the circumference of the cervix. Our results suggest that the morphology of the EDJ can distinguish lower molars of these southern African hominins, and it can discriminate first, second, and third molars within each taxon. These results confirm previous findings that the EDJ preserves taxonomically valuable shape information in worn teeth. Mean differences in EDJ shape, in particular dentine horn height, crown height, and cervix shape, are more marked between adjacent molars within each taxon than for the same molar between the two taxa.

  11. Morphology of the Physiological Apical Foramen in Maxillary and Mandibular First Molars

    Science.gov (United States)

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

    2015-01-01

    SUMMARY Information regarding the anatomy of the physiological apical foramen is limited. Knowing its diameter and shapes contributes to clinical work, specifically to the cleaning and shaping of the apical third. The aim of this ex vivo study was to determine the minimum and maximum diameters and shape of the physiological apical foramen in the roots of maxillary and mandibular first molars. A descriptive study was conducted on 89 recently extracted first molars. Roots 3–5 mm from the apex were sectioned and prepared for analysis at 40× magnification. The minimum and maximum diameters of each physiological foramen were measured using the program Motic Images plus 2.0 ML. The shape of the foramina, classified as round, oval or irregular, was determined by the difference between the maximum and minimum diameters. A total of 174 physiological foramina were analyzed. The average of the minimum and maximum diameters was between 0.24–0.33 mm in maxillary first molars and between 0.25–0.33 mm in mandibular first molars. In maxillary molars, the most common shape of the foramen was oval (50%), then irregular (32%), then round (18%). In mandibular molars, the oval shape was also the most frequent (59%), followed by irregular (23%) and round (18%). The findings of this study regarding the morphology of physiological apical foramina in first molars make it easier for the operator to choose the appropriately-sized instruments to perform endodontic therapy successfully. PMID:25937698

  12. Morphology of the Physiological Apical Foramen in Maxillary and Mandibular First Molars.

    Science.gov (United States)

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

    2014-06-01

    Information regarding the anatomy of the physiological apical foramen is limited. Knowing its diameter and shapes contributes to clinical work, specifically to the cleaning and shaping of the apical third. The aim of this ex vivo study was to determine the minimum and maximum diameters and shape of the physiological apical foramen in the roots of maxillary and mandibular first molars. A descriptive study was conducted on 89 recently extracted first molars. Roots 3-5 mm from the apex were sectioned and prepared for analysis at 40× magnification. The minimum and maximum diameters of each physiological foramen were measured using the program Motic Images plus 2.0 ML. The shape of the foramina, classified as round, oval or irregular, was determined by the difference between the maximum and minimum diameters. A total of 174 physiological foramina were analyzed. The average of the minimum and maximum diameters was between 0.24-0.33 mm in maxillary first molars and between 0.25-0.33 mm in mandibular first molars. In maxillary molars, the most common shape of the foramen was oval (50%), then irregular (32%), then round (18%). In mandibular molars, the oval shape was also the most frequent (59%), followed by irregular (23%) and round (18%). The findings of this study regarding the morphology of physiological apical foramina in first molars make it easier for the operator to choose the appropriately-sized instruments to perform endodontic therapy successfully.

  13. Changes in the Position of Mandibular Third Molars Following Extraction and Non-Extraction Orthodontic Treatments

    Directory of Open Access Journals (Sweden)

    Maryam Poosti

    2013-01-01

    Full Text Available Introduction: Impaction of third molars can be associated with a number of sequelae, each requiring a different type of treatment. The purpose of this study was to assess the changes in the position of lower third molars following extraction and non-extraction orthodontic treatments. Methods: Pre- and post-treatment panoramic radiographs of 26 class I malocclusion patients (4 male and 22 female who were treated on a non-extraction basis were compared with those of 30 class I malocclusion patients (5 male and 25 female who received orthodontic treatment following the extraction of all first premolars. In each group, the lower third molar angulations and their distance from the lower border of the mandible were assessed. Results: Paired t-tests and independent t-tests detected significant changes in the position of the lower third molars in the extraction group. Both the left and right molars became more upright and their distance from the lower border of the mandible increased. Similar changes were only seen in the position of the right mandibular third molars in the non-extraction group. Conclusion: Tooth extractions can bring about favorable changes in the position of mandibular third molars and possibly reduce their incidence of impaction

  14. Restorasi Resin Komposit Menggunakan Pasak Tapered Self Threading Pada Molar Ketiga Kiri Mandibula

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    Ellen Krisanti

    2013-06-01

    Composite Resin Restoration Using Tapered Self Threading Poston Left Mandibular Third Molar. Root canal morphology of mandibular third molar has more complex variation than the other molars. In third molar, the extraction teeth are often executed; however, the third molar can be maintained in other conditions. One visit root canal treatment is a therapy option for this case. The purpose of this case report is to show the success of one visit root canal treatment in third molar with pulp necrosis by restoring the composite resin through tapered self-treading post. A 20 year-old female patient who came to the Prof Soedomo RSGM, FKG UGM complained about the pain when chewing food on her third molar and positive in percussion. The radiographs showed that there was an incomplete restoration. There was a gap between cavities with restoration. The treatment plan for this case was one visit root canal treatment and composite resin with tapered self-threading post as final restoration. From the case, it can concluded that one visit root canal treatment results in a smaller chance for microorganism recontamination than the multi-visit in order to ensure the success of the treatment. Direct composite resin restoration with tapered self-threading dowel is an alternative restoration after endodontic treatment because it works out faster and more retentive.

  15. Relationship between post-extraction pain and acute pulpitis: a randomised trial using third molars.

    Science.gov (United States)

    Zhang, Wei; Dai, Yong-Bo; Wan, Peng-Cheng; Xu, Dong-Dong; Guo, Yi; Li, Zhi

    2016-12-01

    The aim of the present study was to examine the relationship between post-extraction pain and acute pulpitis in third molars. This study was a randomised controlled trial. Sixty patients requiring removal of a single maxillary third molar with acute pulpitis were included and randomly divided into two groups: group A (n = 30); and group B (n = 30). In group A, third molars were directly extracted, and group B received endodontic therapy (pulp chamber opening and drainage) and underwent extraction 24 hours later, aiming to eliminate the acute inflammation. Another 30 patients requiring removal of a single maxillary third molar and with the same inclusion criteria but without caries or acute pulpitis were recruited into group C, in which the maxillary third molars were also directly extracted. The level of postoperative pain reported each day among the three groups was statistically evaluated. On the first, second and third days after surgery, there was a statistically significant difference between group A and group B and between group A and group C, but there was no statistically significant difference between group B and group C. The results of the present study indicate that there is more pain when third molars with acute pulpitis are directly removed compared with the pain level of the removal of third molars without acute pulpitis. © 2016 FDI World Dental Federation.

  16. Ectopic Molar Pregnancy: Diagnostic Efficacy of Magnetic Resonance Imaging and Review of the Literature.

    Science.gov (United States)

    Yamada, Yasushi; Ohira, Satoshi; Yamazaki, Teruyuki; Shiozawa, Tanri

    2016-01-01

    Ectopic molar pregnancy is extremely rare, and preoperative diagnosis is difficult. Our literature search found only one report of molar pregnancy diagnosed preoperatively. Moreover, there is no English literature depicting magnetic resonance image (MRI) findings of ectopic molar pregnancy. We report a case of ectopic molar pregnancy preoperatively diagnosed using MRI. A literature review of 31 cases of ectopic molar pregnancy demonstrated that lesions have been found in the fallopian tube (19 cases, 61%), ovary (5 cases, 16%), cornu (3 cases, 10%), peritoneum (2 cases, 6%), uterine cervix (1 case, 3%), and cesarean scar (1 case, 3%). Abdominal pain and abnormal vaginal bleeding were reported in 70% and 61% of the patients, respectively. Twenty-one cases (67%) presented with rupture and hemoperitoneum. All patients underwent surgical resection or dilatation and curettage. Methotrexate therapy was performed in one case because residual trophoblastic tissue was suspected. A second operation was performed in one case of ovarian molar pregnancy because serum hCG levels increased again after primary focal ovarian resection. No patients developed metastatic disease or relapsed. These findings suggest the prognosis of ectopic molar pregnancy to be favorable.

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

    Science.gov (United States)

    Nagaveni, N B; Radhika, N B

    2012-01-01

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

  18. Effect of Submucosal Injection of Dexamethasone on Post-operative Sequelae of Third Molar Surgery

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    S P Deo

    2011-06-01

    Full Text Available Introduction: This study was carried out to evaluate the effects of a single pre-operative sub-mucosal injection of dexamethasone after third molar surgery to see the effects on post-operative discomfort. Methods: This study was a prospective, double-blind, randomized, clinical trial. The subjects were forty patients who underwent surgical removal of the mandibular impacted third molar under local anesthesia and after being randomly assigned to receive either an 8 mg dexamethasone as submucosal injection or a normal saline injection into the lower buccal vestibule adjacent to the third molar. The maximum interincisal distance and facial contours were measured at the baseline and post-surgically on Day 2 and 7. Post-operative pain was evaluated subjectively using a visual analog scale and objectively by counting the number of analgesic tablets used. All subjects were operated upon by the same investigator to minimize the difference from inter-operator variability. Results: There was a signicant difference in the measurements of the degree of swelling and trismus between the two groups on the 2nd post-operative day. In contrast, there was no statistically signicant difference between the groups on the 7th post-operative day. The test group also used fewer analgesics post-operatively. Conclusions: Submucosal injection of dexamethasone after third molar surgery is effective in reducing postoperative swelling and trismus. It also delays the onset of post-operative pain. Keywords: dexamethasone, submucosal injection, third molar, third molar surgery, third molar extraction

  19. Pattern of mandibular third molar impaction: A cross-sectional study in northeast of Iran.

    Science.gov (United States)

    Eshghpour, M; Nezadi, A; Moradi, A; Shamsabadi, R Mahvelati; Rezaei, N M; Nejat, A

    2014-01-01

    Impacted teeth, if left untreated, have a potential to induce various complications. The aim of the current study was to determine the prevalence and pattern of impacted mandibular third molar in the Iranian population. This cross-sectional study was performed in patients who were referred to the Department of Oral Radiology between July 2009 and October 2010 to obtain an orthopantomogram (OPG). Data were collected regarding age and gender, prevalence of impacted mandibular third molars, angulation of impacted teeth (Winter's classification), level of impaction (Pell and Gregory classification), and relationship of the mandibular third molar with the ramus (Pell and Gregory classification). The collected data were analyzed using SPSS software version 11.0 with a confidence interval of 95%. Among the 1433 patients included in the study, 489 (34.12%) patients were male and 944 (65.88%) were female. Of the total OPGs performed, 871 (60.78%) OPGs demonstrated at least one impacted mandibular third molar. In addition, of the 2866 mandibular third molars investigated, 1397 (48.74%) were found to be impacted. A significant association was observed between gender and the number of impacted teeth or the presence of impaction of any mandibular tooth (or teeth) (P third molar (P > 0.05). The pattern of mandibular third molars in the Northeast region of Iran revealed a high prevalence of impaction, which was mostly mesioangular, level B, and Class II with a gender predilection for females.

  20. Morphometric variation of extant platyrrhine molars: taxonomic implications for fossil platyrrhines

    Directory of Open Access Journals (Sweden)

    Mónica Nova Delgado

    2016-05-01

    Full Text Available The phylogenetic position of many fossil platyrrhines with respect to extant ones is not yet clear. Two main hypotheses have been proposed: the layered or successive radiations hypothesis suggests that Patagonian fossils are Middle Miocene stem platyrrhines lacking modern descendants, whereas the long lineage hypothesis argues for an evolutionary continuity of all fossil platyrrhines with the extant ones. Our geometric morphometric analysis of a 15 landmark-based configuration of platyrrhines’ first and second lower molars suggest that morphological stasis may explain the reduced molar shape variation observed. Platyrrhine lower molar shape might be a primitive retention of the ancestral state affected by strong ecological constraints throughout the radiation of the main platyrrhine families. The Patagonian fossil specimens showed two distinct morphological patterns of lower molars, Callicebus—like and Saguinus—like, which might be the precursors of the extant forms, whereas the Middle Miocene specimens, though showing morphological resemblances with the Patagonian fossils, also displayed new, derived molar patterns, Alouatta—like and Pitheciinae—like, thereby suggesting that despite the overall morphological stasis of molars, phenotypic diversification of molar shape was already settled during the Middle Miocene.

  1. Systemic Inflammation after Third Molar Removal: A Case-Control Study.

    Science.gov (United States)

    Graziani, F; D'Aiuto, F; Gennai, S; Petrini, M; Nisi, M; Cirigliano, N; Landini, L; Bruno, R M; Taddei, S; Ghiadoni, L

    2017-12-01

    Third molar extraction is one of the most frequent interventions in dentistry. Nevertheless, there is scarce evidence on the host response of individuals with impacted or semi-impacted third molars and the possible effects of surgical removal. A case-control study of 40 patients was designed to evaluate 1) the differences in biomarkers of systemic inflammation, vascular function, and metabolism (high-sensitive C-reactive protein, lipids, fibrinogen, oxidative stress, and endothelial function analysis) and 2) the acute and short-term effects of surgical removal in patients with bilateral impacted or semi-impacted third molars compared to controls with no third molars. Patients undergoing third molar extraction exhibited greater levels of systemic inflammation, oxidative stress, and triglycerides than controls. Raised white blood cell counts as well as peaks of serum levels of C-reactive protein and fibrinogen were noticed in the first postoperative week. Three months after the extraction, all markers returned to baseline values. Malondialdehyde, an indicator of oxidative stress indicator, was significantly reduced after third molar removal. Semi-impacted or impacted third molars are associated with higher systemic inflammation, and their removal may represent a useful human model to study acute inflammation and determine beneficial systemic effects ( ClinicalTrials.gov NCT03048175).

  2. Radiographic findings on 3rd molars removed in 20-year-old men.

    Science.gov (United States)

    Rajasuo, Ari; Peltola, Jaakko; Ventä, Irja; Murtomaa, Heikki

    2003-10-01

    In this study we assess radiographic findings characteristic of mandibular 3rd molars that had required either routine or surgical extraction. X-ray findings relating to acute pericoronitis were also examined. The material was collected by investigating patient records and rotational panoramic radiographs of 20-year-old Finnish male conscripts (n = 738) treated during military service because of 3rd-molar-related problems. The follicle around the crown of mandibular 3rd molars with acute pericoronitis was enlarged in 19% of cases and in 13% of chronic symptom-free pericoronitis cases (not statistically significant difference). Mandibular 3rd molars extracted surgically were more often mesially inclined than those extracted routinely (61% vs. 23%; P pericoronitis [around 27% vs. 39% of the teeth routinely extracted (OR 0.5, 95% CI 0.3-0.8)]. In 86% of cases the space between 2nd molar and ramus of the mandible was narrower than the 3rd molar extracted surgically, whereas this was 62% in routine extraction cases (P < 0.001). We conclude that there are some typical 3rd-molar findings in rotational panoramic radiographs that show a need for surgical extraction.

  3. Endodontic treatment of a mandibular second molar with four roots – A case report and literature review

    Directory of Open Access Journals (Sweden)

    Jorge N.R. Martins

    2014-06-01

    Conclusions: A configuration with four roots is rare for the mandibular molars. This configuration has an incidence of 0.04% in the first lower molar with only three in vivo case reports available. For the second lower molar, no incidence ratio was found.

  4. A New Orthodontic Appliance with a Mini Screw for Upper Molar Distalization

    Directory of Open Access Journals (Sweden)

    Nurhat Ozkalayci

    2016-01-01

    Full Text Available The aim of this study is to present a new upper molar distalization appliance called Cise distalizer designed as intraoral device supported with orthodontic mini screw for upper permanent molar distalization. The new appliance consists of eight main components. In order to understand the optimum force level, the appliance under static loading is tested by using strain gage measurement techniques. Results show that one of the open coils produces approximately 300 gr distalization force. Cise distalizer can provide totally 600 gr distalization force. This range of force level is enough for distalization of upper first and second molar teeth.

  5. Hyperthyroidism in molar pregnancy: rapid preoperative preparation by plasmapheresis and complete improvement after evacuation.

    Science.gov (United States)

    Azezli, Adil; Bayraktaroglu, Taner; Topuz, Samet; Kalayoglu-Besisik, Sevgi

    2007-02-01

    Human chorionic gonadotropin bears structural homology to pituitary thyrotropin. The extremely elevated levels of human chorionic gonadotropin in patients with molar pregnancy or other trophoblastic diseases can lead to hyperthyroidism. We describe a patient with molar pregnancy who had secondary hyperthyroidism prepared rapidly by plasmapheresis for surgery. The clinical picture improved dramatically after the first plasmapheresis. Three subsequent plasmapheresis provided a 75.1% decrease in serum free T3 concentrations and 63.9% free T4 concentrations and recovery after evacuation. This is the first use of plasmapheresis in rapid preparation of a patient who had secondary hyperthyroidism due to molar pregnancy.

  6. Dentigerous cyst with an impacted third molar obliterating complete maxillary sinus

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    Sanjay Asnani

    2012-01-01

    Full Text Available Dentigerous cyst is the most commonly occurring odontogenic cyst after radicular cyst and accounts for 15% of all true cysts in the jaws. The cyst is more common in mandible than in maxilla. The dentigerous cyst is commonly associated with impacted mandibular third molars. In maxilla, the incidence is rare. Dentigerous cyst in maxillary sinus in association with an impacted third molar is an uncommon entity. We present a case of dentigerous cyst associated with an impacted third molar, completely obliterating the maxillary sinus in a 28-year-old female.

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

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    Sivakumar Nuvvula

    2010-01-01

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

  8. Radiographic evaluation of third molar development in relation to chronological age among Turkish children and youth.

    Science.gov (United States)

    Orhan, K; Ozer, L; Orhan, A I; Dogan, S; Paksoy, C S

    2007-01-05

    A sharp increase in forensic age estimation of living persons has been observed in recent years. However, ethnic populations residing in different countries have been insufficiently analyzed. According to 2004 data compiled by the Essen-based Turkey Research Center, there are 3.8 million Turkish people living abroad, and 3.2 million of them reside in European Union countries. Despite the high number of Turks living abroad, little is known about third-molar development for forensic application in this population. Hence, it was considered worthwhile to determine the developmental stages of the third molar in a group of Turkish population, to assess chronological age estimation based on the developmental stages, and to compare third molar development according to sex, age and location. Orthopantomograms of 1134 Turkish patients, ages 4-20 years were examined and third-molar developmental stages were evaluated based on Demirjian's classifications. Orthopantomograms were scored by two different observers, and Wilcoxon matched-pairs signed-ranks test used to test intra- and inter-observer reliability revealed a strong agreement between both intra- and inter-observer measurements. Linear regression analysis was performed to correlate third-molar development and chronological age, and further statistical analysis was performed to determine the relation between sex, age and location. Results showed a strong linear correlation between age and molar development (males: r(2)=0.57; females: r(2)=0.56). Mineralizations of left and right third molars were compared using Wilcoxon tests, and no statistical differences were found. No significant differences were found in third-molar development between males and females. Mandibular third molar crypt formation was observed in 2.4% of patients at age seven and maxillary third molar crypt formation was observed in 1.3% of patients at age seven. A strong correlation was found between third-molar development and chronological age. Among

  9. Effectiveness of various sterilization methods of contaminated post-fitted molar band

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    Anggia Tridianti

    2013-06-01

    Full Text Available Background: Molar band as anchoring device may be contaminated during the fitting process. Thus, decontamination process is essential to prevent cross-infection between patients. Purpose: The objective of this research was to determine the amount of bacteria in molar band post-fitted on the patient teeth, after previously undergone pre-sterilization using alcohol and ultrasonic cleaning bath followed by sterilization using dry heat oven and steam autoclave, in order to find the best method in decontamination of post-fitted molar band. Methods: Four molar bands which already fitted on one patient then divided evenly into two groups. The first group was pre-sterilized using alcohol. One of the bands then sterilized using dry heat oven, while the other one was sterilized using steam autoclave. The second group was pre-sterilized using ultrasonic cleaning bath. One band from this group then sterilized using dry heat oven and the other was sterilized using steam autoclave. The next step was to immerse all the bands in a phosphate-buffered saline solution. Using micropipette, the solution was retrieved and dropped upon a petri dish containing Brain Heart Infusion broth. The dish was then stored in an incubator for 24 hours, prior to counting the number of bacteria existed. The same methods were used to the rest of the patients, with total 128 molar bands from 32 patients. Results: There was a profound difference in numbers of bacteria found between those methods of sterilization. However, there was a non significant difference between the two groups which were at the alcohol-steam autoclave group and at the ultrasonic cleaning bath-steam autoclave group. Conclusion: This study showed that steam autoclave is better than for sterilizing molar band, as it left the minimal amount of bacteria in post-fitted molar band.Latar belakang: Molar band merupakan suatu alat penjangkaran yang dapat mengalami kontaminasi selama proses fitting band, sehingga perlu

  10. Influence of third molars in Le Fort 1 osteotomy.

    Science.gov (United States)

    Balaji, S M

    2011-07-01

    The influence of maxillary third molar (M3) on the outcomes of Le Fort 1 osteotomy is not deeply investigated. To investigate the influence of M3 on Le Fort 1 osteotomies. Tertiary Referral Center, operated by a single surgeon, prospective study. January 2005 to December 2010. Consecutive Le Fort 1 osteotomy patients with both M3. Gender, position, M3 root morphology, and degree of impaction. Time taken after all osteotomy cuts to point of time when maxilla is placed in predetermined plane. A total of 658 M3 in line of cut were studied. Of all M3, 312 were impacted, 28.9% were partially impacted and 23.7% were erupted. Of all the M3, 2.9% had their cuspal tips above the horizontal cut, 13.8% along the line of cut, and in 20.7% below the line but not erupted. Buccoverted tooth took shortest time (7.74 minutes), while palatoversion required more time (8.44 minutes) (P = 0.000). When the cuspal tip of M3 was located above the horizontal line of cut, the mean time required to achieve the planned position was 7 minutes, while the completely erupted teeth took a mean of 8.24 minutes (P = 0.000). When the M3 is placed higher, it takes lesser time to prepare basal bone to receive the maxilla at its predetermined level. Angulation of M3 influences the outcome. Deeply placed M3 reduces the manipulation of the greater pterygoid palatine vessels in the area thereby minimizing the bleeding in the surgical field.

  11. Molar Hypomineralisation: A Call to Arms for Enamel Researchers.

    Science.gov (United States)

    Hubbard, Michael J; Mangum, Jonathan E; Perez, Vidal A; Nervo, Garry J; Hall, Roger K

    2017-01-01

    Developmental dental defects (DDDs, hereafter "D3s") hold significance for scientists and practitioners from both medicine and dentistry. Although, attention has classically dwelt on three other D3s (amelogenesis imperfecta, dental fluorosis, and enamel hypoplasia), dental interest has recently swung toward Molar Hypomineralisation (MH), a prevalent condition characterised by well-delineated ("demarcated") opacities in enamel. MH imposes a significant burden on global health and has potential to become medically preventable, being linked to infantile illness. Yet even in medico-dental research communities there is only narrow awareness of this childhood problem and its link to tooth decay, and of allied research opportunities. Major knowledge gaps exist at population, case and tooth levels and salient information from enamel researchers has sometimes been omitted from clinically-oriented conclusions. From our perspective, a cross-sector translational approach is required to address these complex inadequacies effectively, with the ultimate aim of prevention. Drawing on experience with a translational research network spanning Australia and New Zealand (The D3 Group; www.thed3group.org ), we firstly depict MH as a silent public health problem that is generally more concerning than the three classical D3s. Second, we argue that diverse research inputs are needed to undertake a multi-faceted attack on this problem, and outline demarcated opacities as the central research target. Third, we suggest that, given past victories studying other dental conditions, enamel researchers stand to make crucial contributions to the understanding and prevention of MH. Finally, to focus geographically diverse research interests onto this nascent field, further internationalisation of The D3 Group is warranted.

  12. Forces produced by lip bumpers on mandibular molars.

    Science.gov (United States)

    Hodge, J J; Nanda, R S; Ghosh, J; Smith, D

    1997-06-01

    The purpose of this study was to measure the forces produced by a lip bumper on the mandibular permanent first molars. The forces in a sample of 38 patients were measured bilaterally with specially designed gauges at rest but with their lips lightly touching, speaking the words church, phone, and pop, and swallowing water. Forces were compared between two types of lip bumpers, i.e., wire or shield, and between various anteroposterior and vertical positions of the lip bumper. The resting forces produced by the wire lip bumper 2 mm anterior to the incisors and vertically positioned at the middle of the incisor crown were 5.93 +/- 4.84 gm for the left side and 4.66 +/- 4.8 gm for the right. The forces were found to be significantly higher when the wire lip bumper was placed 4 mm anterior to the incisors and at a more gingival position, measuring 16.68 +/- 8.7 gm for the left side and 13.88 +/- 8.28 gm for the right. The shield lip bumper had higher forces both at the center of the incisor as well as when it was positioned gingivally. A large individual variation was observed. There were no statistically significant differences in force levels between male and female subjects. Speaking the words church, pop, and phone, produced forces between 11 and 23 gm, using a wire lip bumper. Swallowing produced the highest forces, between 32 and 36 gm. Lip thickness and height did not appear to affect the force levels.

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

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    Jerjes Waseem

    2009-10-01

    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.

  14. Predicting third molar surgery operative time: a validated model.

    Science.gov (United States)

    Susarla, Srinivas M; Dodson, Thomas B

    2013-01-01

    The purpose of the present study was to develop and validate a statistical model to predict third molar (M3) operative time. This was a prospective cohort study consisting of a sample of subjects presenting for M3 removal. The demographic, anatomic, and operative variables were recorded for each subject. Using an index sample of randomly selected subjects, a multiple linear regression model was generated to predict the operating time. A nonoverlapping group of randomly selected subjects (validation sample) was used to assess model accuracy. P≤.05 was considered significant. The sample was composed of 150 subjects (n) who had 450 (k) M3s removed. The index sample (n=100 subjects, k=313 M3s extracted) had a mean age of 25.4±10.0 years. The mean extraction time was 6.4±7.0 minutes. The multiple linear regression model included M3 location, Winter's classification, tooth morphology, number of teeth extracted, procedure type, and surgical experience (R2=0.58). No statistically significant differences were seen between the index sample and the validation sample (n=50, k=137) for any of the study variables. Compared with the index model, the β-coefficients of the validation model were similar in direction and magnitude for most variables. Compared with the observed extraction time for all teeth in the sample, the predicted extraction time was not significantly different (P=.16). Fair agreement was seen between the β-coefficients for our multiple models in the index and validation populations, with no significant difference in the predicted and observed operating times. Copyright © 2013 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

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

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    José Eduardo Ferreira Manso

    2011-01-01

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

  16. An Ex-vivo Shear and tensile bond strengths of orthodontic molar tubes bonded using different techniques

    Science.gov (United States)

    Alwahadni, Ahed

    2017-01-01

    Background Molar bonding procedures need continuous improvement to be widely accepted clinically and eventually replace molar bands. Material and Methods The purpose of this study was to determine the effects of enamel micro-abrasion and silane coating of the base of molar tubes on shear and tensile bond strengths of orthodontic molar tubes. A total of 200 third molars were randomly allocated into five groups of 40 teeth as follows: group 1: molar tubes bonded to etched teeth (37% phosphoric acid gel; control group); group 2: molar tubes bonded to etched teeth (37% phosphoric acid) with the addition of silane to the base of molar tubes; group 3: molar tubes bonded to teeth pre-treated with 18% hydrochloric acid and pumice (micro-abrasion); group 4: molar tubes bonded to teeth pre-treated with microabrasion with the addition of silane to the base of molar tubes; group 5: molar tubes bonded to teeth pre-treated with microabrasion before conventional acid etching combined with the addition of silane to the base of molar tubes. The bond strength testing was performed using a computer control electromechanical universal testing machine. Results The highest mean shear and tensile bond strengths were recorded in group 5 (13.81±2.54MPa and 13.97±2.29 MPa, respectively). Micro-abrasion alone (group 3) and the combination of enamel micro-abrasion and the addition of silane (group 4) produced bond strength values comparable to the control. Conclusions Enamel surface pre-treatment (micro abrasion) before conventional acid etching combined with the addition of silane to the base of the molar tube produced the highest bond strengths among all tested groups. Key words:Molar, shear strength, tensile strength, orthodontic appliances. PMID:28298990

  17. An Ex-vivo Shear and tensile bond strengths of orthodontic molar tubes bonded using different techniques.

    Science.gov (United States)

    Abu-Alhaija, Elham; Jaradat, Mohammad; Alwahadni, Ahed

    2017-03-01

    Molar bonding procedures need continuous improvement to be widely accepted clinically and eventually replace molar bands. The purpose of this study was to determine the effects of enamel micro-abrasion and silane coating of the base of molar tubes on shear and tensile bond strengths of orthodontic molar tubes. A total of 200 third molars were randomly allocated into five groups of 40 teeth as follows: group 1: molar tubes bonded to etched teeth (37% phosphoric acid gel; control group); group 2: molar tubes bonded to etched teeth (37% phosphoric acid) with the addition of silane to the base of molar tubes; group 3: molar tubes bonded to teeth pre-treated with 18% hydrochloric acid and pumice (micro-abrasion); group 4: molar tubes bonded to teeth pre-treated with microabrasion with the addition of silane to the base of molar tubes; group 5: molar tubes bonded to teeth pre-treated with microabrasion before conventional acid etching combined with the addition of silane to the base of molar tubes. The bond strength testing was performed using a computer control electromechanical universal testing machine. The highest mean shear and tensile bond strengths were recorded in group 5 (13.81±2.54MPa and 13.97±2.29 MPa, respectively). Micro-abrasion alone (group 3) and the combination of enamel micro-abrasion and the addition of silane (group 4) produced bond strength values comparable to the control. Enamel surface pre-treatment (micro abrasion) before conventional acid etching combined with the addition of silane to the base of the molar tube produced the highest bond strengths among all tested groups. Key words:Molar, shear strength, tensile strength, orthodontic appliances.

  18. Topography of the pulp chamber in the maxillary primary molars of a Tunisian children

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    Chiraz Baccouche

    2013-01-01

    Conclusion: Mesiodistal dimension of the pulp cavity is not proportional to that of the dental crown. Endodontic access cavity have to be shifted to the distal and vestibular sides from the first to the second upper molar.

  19. Treatment of space loss caused by submerged maxillary second primary molar

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    Karacay S

    2007-03-01

    Full Text Available Submersion is a clinical term describing a tooth depressed below the occlusal plane. In this case report, we present the treatment of a patient who had totally submerged primary maxillary second molar, which caused impaction of the second premolar and space loss in the maxillary arch due to tipping of adjacent teeth. A 12-year-old girl was referred to the pediatric dentistry clinic. The intra-oral examination revealed that right maxillary second primary molar was localized buccal side of posterior maxillary alveolar process, being almost completely covered by gingiva and adjacent teeth inclined closing the space of the related teeth completely. Periapical radiograph demonstrated that maxillary second premolar was impacted. Based on clinical and radiographic findings, maxillary primary second molar was extracted. Headgear was used for the distalization of maxillary right first molar in order to create space for the impacted second premolar. Eruption begun spontaneously 6 months later.

  20. Sealing versus partial caries removal in primary molars: a randomized clinical trial

    National Research Council Canada - National Science Library

    Hesse, D; Bonifácio, C.C; Mendes, F.M; Braga, M.M; Imparato, J.C.P; Raggio, D.P

    2014-01-01

    .... The aim of this clinical trial is to verify the efficacy of pit and fissure sealants in arresting dentinal caries lesions compared to partial excavation and restorative treatment in primary molar teeth...

  1. Use of the intraosseous screw for unilateral upper molar distalization and found well balanced occlusion

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    Buyukyilmaz Tamer

    2006-11-01

    Full Text Available Abstract Background The aim of this study was to present a temporary anchorage device with intraosseous screw for unilateral molar distalization to make a space for the impacted premolar and to found well balanced occlusion in a case. Case presentation A 13-year-old male who have an impacted premolar is presented with skeletal Class I and dental Class 2 relationship. The screw was placed and immediately loaded to distalize the left upper first and second molar. The average distalization time to achieve an overcorrected Class I molar relationship was 3.6 months. There was no change in overjet, overbite, or mandibular plane angle measurements. Mild protrusion (0.5 mm of the upper left central incisor was also recorded. Conclusion Immediately loaded intraosseous screw-supported anchorage unit was successful in achieving sufficient unilateral molar distalization without anchorage loss. This treatment procedure was an alternative treatment to the extraction therapy.

  2. Mandibular second molar with 3 mesial canals and a radix paramolaris

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    N Ragavendran

    2014-01-01

    Full Text Available Mandibular first molar commonly has two roots, the mesial and the distal root. Surprisingly in some mandibular first molar has an unusual extra third root in between mesial and distal root. This extra root is the most commonly seen in lingual side and is called as radix entomolaris. If this extra root is seen on the buccal side, it is termed as radix paramolaris (RP, which is a very rare phenomenon. Recently, various case report studies has shown the presence of third canal in the mesial and distal roots of mandibular molars. They are named as middle mesial and middle distal canal, respectively. Here, we present a case report of mandibular second molar showing three canals in the mesial root and a RP.

  3. A molar masquerading as an ectopic pregnancy in the early first trimester: a salutary lesson

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    Govind A

    2012-08-01

    Full Text Available Abha Govind,1 Nisha Lakhi21Department of Obstetrics and Gynaecology, North Middlesex University Hospital, London, UK; 2Department of Obstetrics and Gynecology, Richmond University Medical Center, Staten Island, New York, NY, USAAbstract: The authors report a case in which a molar pregnancy was mistaken for an ectopic pregnancy in the early first trimester. This confusion delayed diagnosis and caused distress; follow-up led to the final diagnosis of complete hydatidiform mole. Correct preoperative diagnosis of molar pregnancy by ultrasound in early pregnancy may be tricky. It is important to obtain histological evidence to make the final diagnosis of gestational trophoblastic disease. While relatively rare, consideration of molar pregnancy in the differential diagnosis of early pregnancy loss may avoid unnecessary distress.Keywords: first trimester ultrasound, molar pregnancy, gestational trophoblastic disease, complete hydatidiform mole, diagnosis

  4. Fine Structure of Susceptible Enamel Lamellae against Dentin Caries in the Fissures of Rat Molar Teeth

    National Research Council Canada - National Science Library

    Tetsuo KODAKA; Masayuki ABE; Shohei HIGASHI

    1997-01-01

    .... In this study, we observed enamel lamellae in the fissures of caries-free molar teeth of rats, 2 and 4 weeks after birth, by transmitted light microscopy with decalcified sections and by scanning...

  5. Influence of aging on experimental gastrointestinal motility in extraction of rat molar teeth

    National Research Council Canada - National Science Library

    Kuboyama, Noboru; Ogawa, Kei; Tuna, Elif Bahar; Arikawa, Kazumune; Muramatsu, Hisayoshi; Abo, Norioki; Maeda, Takahide

    2012-01-01

      The purpose of the present study was to determine whether different consistency of diet and malocclusion induced by the extraction of molar teeth on the masticatory organs modulated gastric acid...

  6. Unusual treatment of bimaxillary dentoalveolar protrusion via miniscrews and molar extraction

    National Research Council Canada - National Science Library

    Ahmad Al-Fraidi; Ahmed Afify

    2012-01-01

    .... The treatment plan consisted of extraction of both lower first permanent molars, distalization of upper and lower premolars using miniscrews followed by en masse retraction of the upper and lower six anterior teeth...

  7. Awareness of the Complications from Impacted Third Molar Surgeries among General Dental Practitioners

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    Farokh Farhadi

    2016-04-01

    Full Text Available Introduction: Surgery of impacted third molars and the resultant complications are common occurrences in dental offices. Therefore, the present study was undertaken to determine the awareness of general dental practitioners in Tabriz of complications of surgeries of impacted third molars. Materials and methods: In the present study a researcher-made questionnaire was completed by 186 randomly selected general dentists in Tabriz. After collecting the questionnaires and extractions of data, descriptive statistical methods and chi-squared test were used to evaluate the relationship between personal demographic variables (independent and the dependent variable of the study with SPSS 14. Statistical significance was set at P0.05. Conclusion: Based on the results, the awareness of general dental practitioners in Tabriz of the complications of impacted third molar surgeries was at a moderate level.   Key words: Awareness; general dental practitioner; impacted third molar; complications;

  8. Is lingual nerve protection necessary for lower third molar germectomy? A prospective study of 300 procedures.

    Science.gov (United States)

    Chossegros, C; Guyot, L; Cheynet, F; Belloni, D; Blanc, J L

    2002-12-01

    Lingual nerve damage is one of the most common complications of lower third molar removal. However evaluation of the factor involved in these lesions is difficult since most previous series are heterogeneous. The purpose of this prospective randomized study was to ascertain the impact of lingual nerve protection in a homogeneous series including only patients undergoing third molar germectomy (i.e. removal of the developmental bud prior to anchoring of the roots in the jaw). Data from a total of 300 germectomy procedures were included in this study. All procedures were performed by the same experienced surgeon randomly with or without lingual nerve protection. No lingual nerve injury was observed after third molar germectomy regardless of whether or not lingual nerve protection was used. Lingual nerve protection is unnecessary for lower third molar germectomy.

  9. Management of periodontally compromised mandibular molar with Hemisectioning: A case report

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    Bandu Napte

    2014-01-01

    Full Text Available Introduction: Hemisection involves sectioning of a periodontally involved mandibular molar so as to remove the involved root and save the remaining tooth. This procedure helps in saving a tooth which otherwise would have been deemed for extraction. Hemisection refers to removal or separation of root with its accompanying crown portion of two-rooted teeth, most commonly mandibular molars. Method: In this case report, an advanced Endo-Perio lesion on a left mandibular first molar was successfully treated by root-canal treatment and hemisection. This procedure helps preserve the tooth structure, alveolar bone and promote cost savings over other treatment options. Conclusion: Hemisection is a treatment option for saving a mandibular molar which is in advanced stage of periodontal disease of one root. Removal of the affected root will help in retaining the remaining tooth structure.

  10. Iatrogenic mandibular fractures following removal of impacted third molars: an analysis of 130 cases

    National Research Council Canada - National Science Library

    Ethunandan, M; Shanahan, D; Patel, M

    2012-01-01

    .... We analysed 130 cases of mandibular fractures following removal of impacted third molars reported in the literature, including four managed in the maxillofacial unit and identified potential risk factors...

  11. Molar incisor hypomineralization: Considerations about treatment in a controlled longitudinal case

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    Daniela Cristina de Oliveira

    2015-01-01

    Full Text Available Molar incisor hypomineralization (MIH is a defect in the tooth enamel of systemic origin and may affect one or all four first permanent molars frequently associated with the permanent incisors. This case reports a 7-year-old child with severe MIH in the permanent molars associated with tooth decay and intense pain. In the first stage of treatment, therapy was performed with fluoride varnish and restoration with glass ionomer cement (GIC. After 6 years of clinical and radiographic follow-up, the restorations presented wear and fractures on the margins, indicating their replacement with composite resin. Severe cases of MIH in the early permanent molars can be treated with varnish and GIC to restore the patient′s comfort and strengthen the hypomineralized dental structures. The clinical and radiographic monitoring frequently indicated when the restoration with composite resin should be performed.

  12. Evaluation of the agreement by examiners according to classifications of third molars

    National Research Council Canada - National Science Library

    Lima, C-J; Silva, L-C-F; Melo, M-R-S; Santos, J-A-S-S; Santos, T-S

    This study recorded and evaluated the intra- and inter-group agreement degree by different examiners for the classification of lower third molars according to both the Winter's and Pell & Gregory's systems...

  13. Predictive factors of difficulty in lower third molar extraction: A prospective cohort study.

    Science.gov (United States)

    Alvira-González, J; Figueiredo, R; Valmaseda-Castellón, E; Quesada-Gómez, C; Gay-Escoda, C

    2017-01-01

    Several publications have measured the difficulty of third molar removal, trying to establish the main risk factors, however several important preoperative and intraoperative variables are overlooked. A prospective cohort study comprising a total of 130 consecutive lower third molar extractions was performed. The outcome variables used to measure the difficulty of the extraction were operation time and a 100mm visual analogue scale filled by the surgeon at the end of the surgical procedure. The predictors were divided into 4 different groups (demographic, anatomic, radiographic and operative variables). A descriptive, bivariate and multivariate analysis of the data was performed. Patients' weight, the presence of bulbous roots, the need to perform crown and root sectioning of the lower third molar and Pell and Gregory 123 classification significantly influenced both outcome variables (pthird molars.

  14. Success Rate of Zinc Oxide Eugenol in Pulpectomy of Necrotic Primary Molars: A Retrospective Study

    National Research Council Canada - National Science Library

    Zahra Bahrololoomi; Shiva Zamaninejad

    2015-01-01

    Introduction: Pulpectomy is a conservative treatment plan for primary necrotic teeth and Zinc Oxide Eugenol is still a good choice as root canal filling material but long term studies on poor prognosis molars...

  15. Clinical evaluation of atraumatic restorations in primary molars: a comparison between 2 glass ionomer cements.

    Science.gov (United States)

    Menezes, Janaína Pereira De Lucena; Rosenblatt, Aronita; Medeiros, Eliane

    2006-01-01

    Dental caries continues to be a highly prevalent disease among Brazilian preschoolers, especially those with low socioeconomic status. The purpose of this randomized, controlled trial was to evaluate in vivo 245 simplified restorations in deciduous molars using glass ionomer cements (Vidrion R and Ketac-Molar). Dental restorations were evaluated at 6- and 12-month follow-ups. The teeth restored with Vidrion R (SS White) on a single tooth surface were successful in 87% of the cases evaluated at 6 months and in 63% at 12 months. The teeth restored with Ketac-Molar on one surface achieved a success rate of 95% at 6 months and 82% at 12 months. No recurrent caries or pulpal infection was evident. Logistic regression analysis demonstrated that teeth with cavities restricted to the occlusal surface on sclerotic dentin showed the best adhesion to the restorative material. The restorations with Ketac-Molar had a better clinical performance than those with Vidrion R.

  16. Prenatal screening tests may be a warning for the partial molar ...

    African Journals Online (AJOL)

    . Placental pathologies in early pregnancy may be overlooked, especially in partial molar pregnancy. We are reporting an incorrect preliminary diagnosed case with an increased risk of Down syndrome in her first-trimester screening test due to ...

  17. Osteomyelitis of the mandible secondary to pericoronitis of an impacted third molar.

    Science.gov (United States)

    Mohammed-Ali, Ricardo I; Collyer, Jeremy; Garg, Montey

    2010-03-01

    Impacted third molars are a common reason for referral to the hospital dental service. Third molar impaction can be complicated by infection. We present two cases of osteomyelitis of the mandible developing secondary to pericoronitis of partially erupted lower third molars. One of the cases reported was recently diagnosed and treated while the other was diagnosed and treated 20 years ago. The most commonly reported pathology associated with impacted lower third molars is pericoronitis. Osteomyelitis of the mandible secondary to pericoronitis is rare. It is helpful if dental practitioners are able to distinguish between the cases of pericoronitis that need emergency referral to hospital and the cases that can be managed in practice and referred to an outpatient clinic.

  18. Comparison of periodontal inflammatory disease in young adults with and without pericoronitis involving mandibular third molars.

    Science.gov (United States)

    Gelesko, Savannah; Blakey, George H; Partrick, Maura; Hill, David L; White, Raymond P; Offenbacher, Steven; Phillips, Ceib; Haug, Richard H

    2009-01-01

    To compare the prevalence and severity of periodontal inflammatory disease in subjects with pericoronitis involving a mandibular third molar and those without pericoronitis. Data obtained from healthy adults consecutively enrolled in an institutional review board-approved trial with pericoronitis affecting at least 1 mandibular third molar (study group) were compared with data obtained during the same time frame from subjects without pericoronitis enrolled in a longitudinal third molar monitoring study (comparison group). The periodontal status of each subject was classified based on periodontal probing depths (PD): all PD or=4 mm, incipient disease; at least 4 PD >or=4 mm, early disease. Full mouth periodontal probing data were obtained as clinical measures of periodontal status. Data were aggregated to the subject level for the third molar region, the 6 third molar probing sites and the 2 second molar distal probing sites, the non-third molar region, and all remaining probing sites. The prevalence of disease in the study and comparison groups were compared with the Fisher's exact test. As an indicator of disease severity, the number of PD >or=4 mm in the 2 groups were compared by the Kruskal-Wallis test. Level of significance was set at P values less than .05. Median age of the 56 subjects with pericoronitis was 23.3 years (IQR 21.3-26.0 years). Fifty-five percent were Caucasian, 16% African American, and 22% Asian. Males and females were almost equally represented in the study group and in the comparison group. The 194 subjects enrolled without pericoronitis were significantly older (32.8 years; IQR 27.2-40.0 years; P pericoronitis had incipient and 55% early disease in the third molar region compared with 25% with incipient and 38% with early disease among subjects without pericoronitis (P = .003). The pattern was similar, but the proportion of subjects was not significantly different between the groups for the non-third molar region. In the study group, 32

  19. Evaluation of the anatomical alterations of lower molars mesial root?s apical third

    Directory of Open Access Journals (Sweden)

    FRÖNER Izabel Cristina

    1999-01-01

    Full Text Available The anatomical apex of the mesial root of the lower molars presents a morphological complexity related to the number and shape of the root canals as well as of the apical foramen and isthmus presence. The knowledge of the complexity of the endodontic system of the molar root area is essencial to select more carefully the best instrumentation and obturation technique, to obtain a more successful endodontic therapy.

  20. The effect of headgear on upper third molars: a retrospective longitudinal study

    OpenAIRE

    Miclotte, Annelie; Grommen, Bieke; Lauwereins, Steven; de Llano-Perula, Maria Cadenas; Alqerban, Ali; Verdonck, Anna; Fieuws, Steffen; Jacobs, Reinhilde; Willems, Guy

    2017-01-01

    Objectives: To investigate the effects of orthodontic non-extraction treatment with or without headgear on the position of and the space available for upper third molars in growing children with class II malocclusions. Materials and methods: The sample consisted of pre- and post-treatment panoramic radiographs and lateral cephalograms of 294 class II orthodontic patients; 160 were treated with headgear and 134 were treated without headgear. The space available for the upper third molar was me...

  1. Maxillary first molars with six canals confirmed with the aid of cone-beam computed tomography

    Directory of Open Access Journals (Sweden)

    Tahra Mohammad Al-Habboubi

    2016-01-01

    Full Text Available The maxillary first molar exhibits unpredictable root canal morphology. Different number of root canals has been reported with the aids of new tools. It is very important to clinically detect all canals for better outcome results. The purpose of the present case is to present a case of the maxillary first molar in a Saudi male patient with an anatomical variation of having six root canals that were confirmed with cone-beam computed tomography.

  2. Immunohistochemical Analysis of Human Homologue of Drosophila Patched (PTCH) in Dental Follicles of Impacted Third Molars

    OpenAIRE

    de Oliveira, David Moraes; Ferreira da Silveira, Marcia Maria; de Souza Andrade, Emanuel Savio; Veras Sobral, Ana Paula; Saquete Martins-Filho, Paulo Ricardo; Santos, Thiago de Santana; Amorim de Oliveira, Patricia Leimig; Peixoto, Aline Carvalho; Santana de Souza Santos, Jadson Alipio; Piva, Marta Rabello

    2012-01-01

    This study investigated the immunodetection of PTCH in epithelial components of dental follicles associated with impacted third molars without radiographic signs of pathosis. One hundred and five specimens of dental follicles associated with impacted third molars with incomplete rhizogenesis (between Nolla's stage 6 and 9) were surgically removed from 56 patients. Epithelial cell proliferation was determined by using immunohistochemical labeling. Statistical analysis was performed using Fishe...

  3. A geometric morphometric analysis of hominin lower molars: Evolutionary implications and overview of postcanine dental variation.

    Science.gov (United States)

    Gómez-Robles, Aida; Bermúdez de Castro, José María; Martinón-Torres, María; Prado-Simón, Leyre; Arsuaga, Juan Luis

    2015-05-01

    Lower molars have been extensively studied in the context of hominin evolution using classic and geometric morphometric analyses, 2D and 3D approaches, evaluations of the external (outer enamel surface) and internal anatomy (dentine, pulp chamber, and radicular canals), and studies of the crown and root variation. In this study, we present a 2D geometric morphometric analysis of the crown anatomy of lower first, second, and third molars of a broad sample of hominins, including Pliocene and Lower, Middle, and Upper Pleistocene species coming from Africa, Asia, and Europe. We show that shape variability increases from first to second and third molars. While first molars tend to retain a relatively stable 5-cusped conformation throughout the hominin fossil record, second and third molars show marked distal reductions in later Homo species. This trend to distal reduction is similar to that observed in previous studies of premolars and upper second and third molars, and points to a correlated reduction of distal areas across the whole postcanine dentition. Results on lower molar variation, as well as on other postcanine teeth, show certain trends in European Pleistocene populations from the Atapuerca sites. Middle Pleistocene hominins from Sima de los Huesos show Neanderthal affinities and strong dental reduction, especially in the most distal molars. The degree of dental reduction in this population is stronger than that observed in classic Neanderthals. Homo antecessor hominins from Gran Dolina-TD6 have primitive lower teeth that contrast with their more derived upper teeth. The evolutionary implications of these dental affinities are discussed in light of recent paleogenetic studies. Copyright © 2015 Elsevier Ltd. All rights reserved.

  4. Fracture Resistance of Pulpotomized Primary Molar Restored with Extensive Class II Amalgam Restorations

    Directory of Open Access Journals (Sweden)

    F. Mazhari

    2008-06-01

    Full Text Available Objective: The aim of the present study was to evaluate fracture resistance of pulpoto-mized primary molar teeth restored with extensive multisurface amalgam restorations.Materials and Methods: Eighty extracted carious human primary molar teeth were se-lected forpresent study. Teeth were divided in to eight groups of ten. Mesio- or disto-occlusal and Mesio-occluso-distal cavities with different cavity wall thickness (1.5 or 2.5mm were prepared in both first and second primary molar teeth. After restoring teeth with amalgam, all specimens were stored in distilled water at 37°C for 7 days. Then samples were thermocycled for 1000 cycles from 5°C to 55°C. The specimens then were subjected to a compressive load in a universal testing machine at a crosshead speed of 0.5 mm min-1. ANOVA and t-test were used for statistical analysis.Results: Mean fracture resistance of first and second molar teeth were 975.5 N (SD=368.8 and 1049.2 N (SD=540.1 respectively. In the first molar group, fracture resis-tance of two-surface cavities was significantly more than three-surface cavities (P<0.001, however this difference was not statistically significant in the second molar group. In both first and second molar group, fracture resistance incavities with 2.5 mm wall thickness, was significantly more than the group with 1.5 mm wall thickness.Conclusion: The mean fracture resistance in pulpotomized primary molar restored with amalgam restorations was higher than reported maximum bite force in primary teeth even in extensive multi-surface restorations. Therefore, the teeth with large proximal carious lesions in schoolchildren could be restored with amalgam.

  5. Probabilidad de retención de segundos molares permanentes mandibulares (Estudio piloto

    Directory of Open Access Journals (Sweden)

    Paulo Sandoval Vidal

    Full Text Available Objetivos: Determinar la frecuencia del segundo molar mandibular permanente (MM2 con probabilidad de impactación, en un grupo de pacientes de Ortodoncia de Temuco, Chile. Método: Estudio de corte transversal, con muestra por conveniencia. Se revisaron 2095 fichas de individuos de ambos sexos, con ausencia de patología sindrómica. Los datos recolectados se obtuvieron de radiografías panorámicas. Se midió el ángulo del segundo molar con respecto al plano oclusal, la invasión distal del primer molar y la distancia entre distal del primer molar y el borde anterior de la rama mandibular. Resultados: El promedio de edad de los pacientes relevados fue de 10 años. Se observó un 1,43% de probabilidad de retención de MM2 (n=30; en promedio y el plano el ángulo MM2 resultó de 27° el izquierdo y 26° el derecho; la invasión de MM2 en distal del primer molar resultó de 1,5 mm; el ángulo entre MM2 y el planos oclusal es de 123°; la distancia entre la cara distal del primer molar y el borde anterior de la rama mandibular fue 13 mm. Conclusiones: Existe una baja prevalencia de segundos molares mandibulares permanentes con probabilidad de impactación. La invasión a la cara distal del primer molar fue mayor en pacientes con riesgo de impactación

  6. Evaluation of treatment changes associated with maxillary molar distalization with the distal jet appliance

    Directory of Open Access Journals (Sweden)

    Ashok Karad

    2014-01-01

    Full Text Available Objectives: Maxillary molar distalization is one of the non-extraction treatment options to gain space in the maxillary arch for the resolution of class II malocclusions. This retrospective clinical study was aimed at evaluating the nature of maxillary first molar movement after distalization with the distal jet and its effects on incisor position and facial soft-tissues. Materials and Methods: The study sample consisted of 22 subjects (10 boys, 12 girls having an average age of 13.04 years at the time of obtaining pre-treatment diagnostic records. The distal jet was the only appliance used during the distalization phase of treatment. All patients were treated by a single clinician with strict adherence to a standardized treatment protocol. The average duration of molar distalization was 6.09 months. Pre-treatment and postdistalization lateral cephalograms were obtained to analyze dentoalveolar and soft-tissue changes. Results: This study revealed that the maxillary first molars were distalized by an average of 4.29 mm into a class I molar relationship. In the process, the molars exhibited distal molar tipping (6.66° and extrusion (1.45 mm. The maxillary incisors were displaced and tipped labially by 1.89 mm and 2.84° respectively, leading to an increase in overjet by 0.86 mm and decrease in overbite by 0.98 mm. The soft-tissue changes involved upper and lower lip protrusion by 0.84 mm and 1.45 mm respectively, with an increase in lower facial height by 1.36 mm. Conclusion: This study confirmed the reliable and effective distalization of maxillary first molars with the distal jet, with certain undesirable and reciprocal effects on incisor position and minimal impact on the facial soft-tissues.

  7. Endodontic management of permanent mandibular left first molar with six root canals

    Directory of Open Access Journals (Sweden)

    Sachin Gupta

    2012-01-01

    Full Text Available The endodontic treatment of a mandibular molar with aberrant canal configuration can be diagnostically and clinically challenging. This case report presents the treatment of a mandibular first molar with six root canals, of which three canals were located in the mesial root and three in distal root. Third canals were found between the two main root canals. This case presents a rare anatomic configuration and points to the importance of expecting and searching for additional canals.

  8. A case report : Supernumerary roots of deciduous molar associated with missing permanent premolars

    OpenAIRE

    藤井,博志/畑,良明/今北,将人/森清,裕士/伊藤,修一; フジイ,ヒロシ/ハタ,ヨシアキ/イマキタ,マサト/モリキヨ,ヒロシ/イトウ,シュウイチ; FUJII,Hiroshi/HATA,Yoshiaki/IMAKITA,Masato/MORIKIYO,Hiroshi/ITO,Shuichi

    2002-01-01

    Malformations of deciduous teeth occur is very rare, because of their primitive forms. The abnormality of the roots of deciduous teeth as well as of crowns is rare. This case report is the supernumerary roots of deciduous molar with congenitally missing teeth in a 12-year 10-month old male. The findings are as follows : 1)In the upper right second primary molar, the supernumerary root was formed beneath a protoconule which developed without complications. 2) The lingual cusps of the upper bil...

  9. Positional relationship between mandibular third molar and mandibular canal in cone beam computed tomographs

    Energy Technology Data Exchange (ETDEWEB)

    Yu, Su Kyung; Lee, Ji Un; Kim, Kyoung A; Koh, Kwang Joon [Chonbuk National Univ. Hospital, Chonju (Korea, Republic of)

    2007-12-15

    To provide diagnostic information by evaluation of the positional relationship between the mandibular third molar and the mandibular canal. Eighty-nine mandibular third molars were classified as mesioangular, horizontal, vertical, distoangular groups. The distances between the mandibular third molar and the mandibular canal were measured in cone-beam computed tomographs. The height and width ratios of distances from the mandibular third molar and the mandibular canal to the mandibular inferior border and to the lingual cortical plate were calculated. The vertical and buccolingual distances between the mandibular third molar and the mandibular canal were 0.03 mm, 2.96 mm in the mesioangular, 0.37 mm, 3.38 ,, in the horizontal, -1.50 mm, 1.38 mm in the vertical, -1.10 mm, 4.20 mm in the distoangular group. There were significant differences in vertical (P<0.05), but not in buccolingual (P>0.05). The height and width ratios of distances on the mandibular third molar were 47.1%, 36.1% in the mesioangular, 47.4%, 34.4% in the horizontal, 37.0%, 46.7% in the vertical, 40.9%, 37.4% in the distoangular group. There were significant differences between the mesioangular and the vertical group, and the horizontal and the vertical group in height ratio (P>0.05). The mesioangular group showed the nearest distance between the mandibular third molar and the mandibular canal vertically. The root apex of the mandibular third molar was positioned more buccally in the vertical group than in the mesioangular group.

  10. Mandibular molar root morphology in Neanderthals and Late Pleistocene and recent Homo sapiens.

    Science.gov (United States)

    Kupczik, Kornelius; Hublin, Jean-Jacques

    2010-11-01

    Neanderthals have a distinctive suite of dental features, including large anterior crown and root dimensions and molars with enlarged pulp cavities. Yet, there is little known about variation in molar root morphology in Neanderthals and other recent and fossil members of Homo. Here, we provide the first comprehensive metric analysis of permanent mandibular molar root morphology in Middle and Late Pleistocene Homo neanderthalensis, and Late Pleistocene (Aterian) and recent Homo sapiens. We specifically address the question of whether root form can be used to distinguish between these groups and assess whether any variation in root form can be related to differences in tooth function. We apply a microtomographic imaging approach to visualise and quantify the external and internal dental morphologies of both isolated molars and molars embedded in the mandible (n=127). Univariate and multivariate analyses reveal both similarities (root length and pulp volume) and differences (occurrence of pyramidal roots and dental tissue volume proportion) in molar root morphology among penecontemporaneous Neanderthals and Aterian H. sapiens. In contrast, the molars of recent H. sapiens are markedly smaller than both Pleistocene H. sapiens and Neanderthals, but share with the former the dentine volume reduction and a smaller root-to-crown volume compared with Neanderthals. Furthermore, we found the first molar to have the largest average root surface area in recent H. sapiens and Neanderthals, although in the latter the difference between M(1) and M(2) is small. In contrast, Aterian H. sapiens root surface areas peak at M(2). Since root surface area is linked to masticatory function, this suggests a distinct occlusal loading regime in Neanderthals compared with both recent and Pleistocene H. sapiens. Copyright © 2010 Elsevier Ltd. All rights reserved.

  11. The Influence of Post in Endodontically Treated Molar Abutment on Fixed Dentures Success Rate

    OpenAIRE

    Pralita Kusumawardhini; Alysia Henrietta; Saraventi Saraventi

    2013-01-01

    Many dentists believe that the tooth need reinforcement provided by post before the definite restoration is placed. However, others suggest not to use post when posterior teeth especially molars, still have significant amount of tooth structure. Therefore, when endodontically treated molar is considered to be used as fixed denture abut-ment, clinicians must have proper knowledge about the impact of post placement. This literature will describe considerations regarding post placement in endodo...

  12. Spectrophotometric color evaluation of permanent incisors, canines and molars. A cross-sectional clinical study.

    Science.gov (United States)

    Pop-Ciutrila, Ioana-Sofia; Colosi, Horatiu Alexandru; Dudea, Diana; Badea, Mandra Eugenia

    2015-01-01

    An accurate color reproduction represents the final validation level of an esthetic anterior or posterior restoration. The aim of this study was to evaluate the color of permanent maxillary incisors, canines and molars, using a clinical spectrophotometer. The Vita Easyshade Advance 4.0(®) intraoral spectrophotometer was used by one clinician to determine the color of 369 permanent maxillary incisors, canines and molars. The best matches to Vitapan Classical(®) and 3D-Master(®) shade guides were recorded. A one-way analysis of variance and Kruskal-Wallis test were used to compare L*, a*, b*, c* and h* color coordinates among the 3 types of teeth. Differences between the mean values of all color coordinates were evaluated by use of Bonferroni corrections. Color difference (ΔE*) between incisors, canines and molars was calculated from ΔL*, Δa* and Δb* data and the results were compared to ΔE*=3.3 acceptability threshold. Except for Δa* and Δh* between canines and molars, statistically significant differences among the mean differences of all color coordinates were found when the 3 types of teeth were compared by pairs. The most frequently measured shades were A1 (48.4%), respectively 1M1 (31.5%) for incisors, B3 (36.6%), respectively 2M3 (39.8%) for canines and B3 (44.7%), respectively 2M3 (52%) for molars. Incisors had the highest lightness values, followed by canines and molars. Molars were the most chromatic with the highest a* and b* values. Despite the limitations of this study, color differences among incisors, canines and molars were found to be statistically significant, above the clinical acceptability threshold established. In conclusion, successful esthetic restorations of permanent teeth of the same patient need an individual color assessment and reproduction of every type of tooth.

  13. Second molar calcification stages to evaluate skeletal maturation: A cross-sectional radiographic study

    Directory of Open Access Journals (Sweden)

    U H Vijayashree

    2014-01-01

    Conclusion: A highly positive correlation exists between DI of mandibular second molars and CVMI. Stage F of Demirjian index, with the root length equal to or greater than the crown height corresponds to stage 3 of CVMI indicating the start of peak in mandibular growth which would be appropriate time to plan for functional appliances. Therefore, mandibular second molar calcification stages are reliable skeletal maturity indicator, which can be used to predict the growth status in determining the optimal treatment timing.

  14. Occlusal morphology of permanent mandibular first and second molars in Gujarati population.

    Science.gov (United States)

    Dholia, Bhavik; Manjunatha, Bhari Sharanesha

    2015-01-01

    Dental identification has been used since long time for disaster victim identification protocol. There is a difference of opinion regarding whether ethnicity influences dental morphology or not. Few studies have shown the associations between these dental features and crown traits in humans using quantitative methods. The present study is an attempt to find correlation of occlusal morphology of Gujarati population with forensic Odontology. To study different occlusal morphology of permanent mandibular first and second molars in Gujarati Population. This study comprised of a total of 100 participants of Gujarati origin, selected by random sampling method. Total number of cusps and groove patterns of mandibular first and second molar were examined clinically and photographs of the same were taken. A descriptive statistics, Chi-square test and Student t-test were used for analysis of data. Mandibular first molar with 5 cusps in 71%, 4 cusps in 18% and 6 cusps in 11% were noted in the study. Mandibular first molars with "+" groove pattern in 39.5% and "Y" groove pattern in 60.5% were recorded. Mandibular second molar with 5 cusps in 6.5% and 4 cusps in 93.5% were recorded in the study. Mandibular second molars with "+" groove pattern in 93.5% and "Y" groove pattern in 6.5% were recorded. The most common occlusal morphology in permanent mandibular first molar is "5 cusp" and "Y" groove pattern in about 47% and for second molar is "4 cusp" and "+" groove pattern in 88.5% of Gujarati population. It may be concluded that variation in degree of expression and frequency of teeth in dentitions of different populations is different, which may help in forensic identification.

  15. Features of treatment of patients with complicated retention of the third molars at the inpatient stage.

    OpenAIRE

    Gudaryan O.O.; Іdashkіna N.G.; Nekhanevich Zh.M.

    2016-01-01

    The aim of the study was to define frequency of infectious-inflammatory complications of the thirds molars retention and outcomes of surgical treatment in residents of Dnipro­petrovsk region on the basis of archiv materials. We surveyed 814 patients with retention of the third molars in the period from 2012 to 2015. On the basis of medical history it was revealed that lately diagnosed and treated acute pericoronaritis, is the cause of formation of severe inflammatory-infectious complications ...

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

    OpenAIRE

    Gintaras Juodzbalys; Povilas Daugela

    2013-01-01

    ABSTRACT Objectives The purpose of present article was to review impacted mandibular third molar aetiology, clinical anatomy, radiologic examination, surgical treatment and possible complications, as well as to create new mandibular third molar impaction and extraction difficulty degree classification based on anatomical and radiologic findings and literature review results. Material and Methods Literature was selected through a search of PubMed, Embase and Cochrane electronic databases. The ...

  17. Agenesis of premolar associated with submerged primary molar and a supernumerary premolar: An unusual case report

    Directory of Open Access Journals (Sweden)

    S. V. S. G. Nirmala

    2012-01-01

    Full Text Available The combination of submerged primary molar, agenesis of permanent successor with a supernumerary in the same place is very rare. The purpose of this article is to report a case of submerged mandibular left second primary molar with supernumerary tooth in the same region along with agenesis of second premolar in an 11-year-old girl, its possible etiological factors, and a brief discussion on treatment options.

  18. Osteomyelitis of the condyle secondary to pericoronitis of a third molar: a case and literature review.

    Science.gov (United States)

    Wang, R; Cai, Y; Zhao, Y F; Zhao, J H

    2014-09-01

    In this study, we report a very unusual case of a patient with osteomyelitis of the condyle secondary to pericoronitis of an impacted third molar. The patient was treated by removal of the impacted third molar, opening of the drainage, combined with systemic application of antibiotics for two weeks. This treatment option did not lead to any functional defects or facial asymmetry. The patient fully recovered and the disease did not recur. © 2014 Australian Dental Association.

  19. Indications for extraction of third molars: a review of 1763 cases.

    Science.gov (United States)

    Adeyemo, W L; James, O; Ogunlewe, M O; Ladeinde, A L; Taiwo, O A; Olojede, A C O

    2008-03-01

    Third molars have been described as different from other teeth in the oral cavity. They have the highest rate of developmental abnormalities and, most importantly, are last in the eruption sequence. We investigated reasons for third molar teeth extraction in patients attending the outpatient oral surgery clinic of the Lagos University Teaching Hospital, Nigeria. A retrospective review of patients who had third molar extractions between January 2001 and June 2006 was conducted. Data retrieved and analysed were: age and sex of patients, indication for extractions, type of teeth extracted, technique of extractions (surgical and non-surgical) and angulations of impaction in case of impacted lower third molars. A total of 1763 patients (mean age +/-SD, 33.74+/- 13.3 years; range 15 - 92 years) had their third molars extracted during the period. Majority (58%) of them were females. Surgical extraction was carried out in 506 (28.7%) patients while 1257 (71.3%) patients had non-surgical extractions. Caries and its sequela (63.2%) was the major reason for teeth extraction followed by recurrent pericoronitis (26.3%) and periodontitis (9.2%). Only 11 (0.6%) cases were removed for prophylactic reason. Patients who had their teeth removed for caries were significantly younger than those for periodontitis (P=0.000) but older than those for pericoronitis (P=0.000). Caries and periodontal diseases occurring in relatively older age group were the major reasons for non-surgical extraction of third molars while recurrent pericoronitis occurring in relatively younger age was the major reason for surgical extraction of impacted third molars. Prophylactic surgical extraction of third molars is not a common practice in our environment.

  20. Unerupted mandibular third molars: symptoms, associated pathologies, and indications for removal in a Turkish population.

    Science.gov (United States)

    Doğan, Necdet; Orhan, Kaan; Günaydin, Yilmaz; Köymen, Ramazan; Okçu, Kemal; Uçok, Ozlem

    2007-09-01

    To analyze the occurrence of symptoms of unerupted mandibular third molars, to investigate associated pathologies, and to determine indications for removal of unerupted mandibular third molars in a Turkish population. A retrospective study was performed by reviewing 832 patients referred to Gulhane Military Medical Academy Dentistry Center for evaluation of their mandibular third molars. The patients were clinically examined, and unerupted and partially erupted mandibular third molars were determined from radiographs. The symptoms and pathologies associated with these teeth were analyzed. The indications for removal were classified into 10 groups. Two-thirds of the patients were between 20 and 29 years of age. Of the 832 unerupted mandibular third molars found, 557 (66.9%) teeth were partially erupted and 275 (33.1%) were completely unerupted. A total of 521 (62.6%) of all unerupted third molars had no symptoms, while 311 (37.4%) were associated with symptoms. The most frequent complaints of the patients were pain and swelling. Pericoronitis was observed as the most frequent pathology, in 142 patients. Of 832 unerupted mandibular third molars, 582 (69.9%) had complete root formation, 177 (21.2%) had two-thirds root formation, and 73 (8.9%) had one-third root formation. Patients between 20 and 29 years of age had the highest prevalence of unerupted mandibular third molars (69.3%). However, this figure decreased with increasing age. Partially erupted teeth (n = 228) caused the occurrence of symptoms more than completely erupted teeth (n = 83) in a Turkish population.