Liu Jeng-Fen, Dai Pei-Wei, Chen San-Yue, Huang Heng-Li, Hsu Jui-Ting, Chen Wil-Lie, Tu Ming-Gene
Section of Pediatric Dentistry, Taichung Veterans General Hospital, Taichung, Taiwan.
Pediatr Dent. 2010 Mar-Apr;32(2):123-6.
The purpose of this study was to determine the prevalence of 3-rooted primary mandibular second molar teeth in Chinese patients via vertical bitewing radiography.
Vertical bitewing radiographs of 227 patients previously obtained from the Department of Pediatric Dentistry, Taichung Veterans General Hospital, Taichung City, Taiwan, from June 2004 to July 2007 were retrospectively screened and examined. Images of 185 patients (92 boys and 93 girls; mean age=5.6 [range=2.5-11.9] years old) with bilateral primary mandibular second molars were studied. The gender, symmetry, and frequencies of occurrence of 3-rooted primary mandibular second molars were compared.
Eighteen (9%) 3-rooted primary mandibular second molars were found in the 185 patients, with a bilateral incidence of a symmetrical distribution of 28% (5/18). The prevalence of 3-rooted primary second molars did not differ significantly between the mandible's right and left sides (P<.41), or with gender (P<.31).
The data presented here indicate that approximately one tenth of Chinese individuals have a 3-rooted primary mandibular second molar and that this condition is bilaterally symmetric in approximately one third of such individuals in a Taiwan hospital.
本研究旨在通过垂直咬合翼片X线摄影确定中国患者中三牙根的下颌第一乳磨牙的患病率。
回顾性筛选并检查了2004年6月至2007年7月期间从台湾台中市台中荣民总医院儿童牙科获得的227例患者的垂直咬合翼片X线照片。研究了185例双侧下颌第一乳磨牙患者（92名男孩和93名女孩；平均年龄=5.6岁[范围=2.5 - 11.9岁]）的图像。比较了三牙根下颌第一乳磨牙的性别、对称性和发生率。
在185例患者中发现了18颗（9%）三牙根下颌第一乳磨牙，双侧对称分布的发生率为28%（5/18）。三牙根下颌第一乳磨牙的患病率在下颌左右两侧之间（P<0.41）或性别之间（P<0.31）无显著差异。
此处呈现的数据表明，约十分之一的中国人有三牙根下颌第一乳磨牙，并且在台湾一家医院中，约三分之一的此类个体中这种情况是双侧对称的。
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