Evaluation of Dental Eruption of Third Molars in the Length of Mandible Evaluaci車n de la Erupci車n Dentaria de los Terceros Molares en Relaci車n a la Longitud de la Mand赤bula

作者：Gilberto de Sousa Filho; Adelmar Afonso de Amorim Junior; Carla Cabral dos Santos Accioly Lins; Joaquim Celestino da Silva Neto

来源：International Journal of Morphology, 2009.

• Tercer molar
• Mandibula
• Erupcion dentaria
• Radiografias panoramicas
• Third molar
• Mandible
• Tooth eruption
• Panoramic radiographic study

The aim of this work was to evaluate the eruption of the third molar teeth in the length of the mandible using the orthodontic documentation obtained between 2005 and 2006 as sampling method, a total of 193 cases of both sexes. The cephalometric analysis and panoramic radiographic studies were chosen from two clinics randomly selected in the city of Recife - Pernambuco - Brazil. It was analyzed the linear size of mandibular bone by the use of McNamara%26apos;s Cephalometric Analysis, and also the presence or not of dental retention of inferior third molar teeth with the help of panoramic radiographic study, evaluating the commitment of these retentions with the effective length of mandible. The work concluded that when the effective mandibular length is small induces a dental retention of these third molars, mostly the left inferior third molar, which 46.5% of the cases was observed as retained. However, in 53.8% of the cases was observed the absence or no-formation of these dental germs for the left inferior third molar and 60% for the right, showing a big size of the effective length of the mandible exposing that the no-formation of these teeth was not directly related to the lack of space in the dental arch. The study demonstrated that the sexual dimorphism does not influence the eruption of these teeth, however, according to age, was emphasized a dependence concerning about dental eruption, retention or absence of left inferior third molar. El objetivo de la presente investigaci車n fue evaluar la erupci車n del tercer molar a lo largo de la mand赤bula usando documentaci車n de ortodoncia obtenida entre los a os 2005 y 2006, en un total de 193 casos de individuos brasile os, adultos, de ambos sexos. El an芍lisis cefalom谷trico y los estudios radiogr芍ficos panor芍micos fueron obtenidos de dos cl赤nicas y seleccionados al azar en la ciudad de Recife, Estado de Pernambuco, Brasil. Se analiz車 el tama o linear de la mand赤bula usando el m谷todo cefal車metrico de McNamara, y tambi谷n la presencia o ausencia de retenci車n dental del tercer molar inferior con la ayuda de radiograf赤as panor芍micas, evaluando la relaci車n de esas retenciones, si las hubiere, con la longitud efectiva de la mand赤bula. Los resultados muestran que cuando la longitud mandibular efectiva es peque a induce a retenci車n dental de los terceros molares, siendo en la mayor赤a de los casos el tercer molar inferior izquierdo, lo cual fue obervado en 46,5 % . Sin embargo, en el 53,8 % de los casos se observ車 ausencia o no formaci車n de los g谷rmenes dentales del molar mencionado, caracter赤stica que se encontr車 en 60 %

• 出版日期2009