Ercal P, Taysi A E
Department of Oral Surgery, Altinbas University, Istanbul, Turkey.
Niger J Clin Pract. 2020 Mar;23(3):392-397. doi: 10.4103/njcp.njcp_520_19.
Tooth agenesis is the congenital lack of one or more primary or permanent teeth and it is the most frequently seen dental anomaly. The prevalence of third molar agenesis is significantly higher than the agenesis of other teeth varying from 10% to 40% and shows geographical variance.
The aim of this study was to investigate the prevalence of third molar agenesis and its association with other tooth agenesis of jaws.
A total of 594 Turkish subjects with or without agenesis of third molars (M3) were included in the study. Dental records and panoramic radiographs were evaluated for M3 agenesis, hypodontia and hyperdontia. Significant differences in the prevalence rate of M3 agenesis between genders among with evaluation of coexistence of M3 and other tooth agenesis were determined by Fisher's exact test.
The prevalence of M3 agenesis was determined as 28.7% with no statistically significant gender or location difference. Most common form of M3 agenesis involved one molar followed by two, four and three molars. Agenesis of other teeth was seen among both patient groups with and without M3 agenesis, without significant difference.
Turkish population with M3 agenesis did not show increased prevalence of other tooth agenesis, indicating no association between occurrence of agenesis of other teeth and M3.
牙齿发育不全是指先天性缺少一颗或多颗乳牙或恒牙，是最常见的牙齿异常情况。第三磨牙发育不全的患病率显著高于其他牙齿的发育不全，在10%至40%之间，且存在地域差异。
本研究旨在调查第三磨牙发育不全的患病率及其与颌骨其他牙齿发育不全的关联。
共有594名有或无第三磨牙（M3）发育不全的土耳其受试者纳入本研究。对牙科记录和全景X线片进行评估，以确定M3发育不全、缺牙症和多生牙情况。通过Fisher精确检验确定M3发育不全患病率在性别之间的显著差异，并评估M3与其他牙齿发育不全的共存情况。
M3发育不全的患病率为28.7%，在性别或位置上无统计学显著差异。M3发育不全最常见的形式是一颗磨牙缺失，其次是两颗、四颗和三颗磨牙缺失。在有和没有M3发育不全的患者组中均可见其他牙齿发育不全，无显著差异。
患有M3发育不全的土耳其人群中，其他牙齿发育不全的患病率并未增加，表明其他牙齿发育不全的发生与M3之间无关联。
