目的 本研究对上海地区中国人下颌第一磨牙远舌根发生率进行探讨.方法 本试验为随机试验.具有双侧下颌第一磨牙的500例患者被纳入研究,采用全景片的方法评估下颌第一磨牙远舌根的发生率.结果 发现有151例(30.20%)患者具有远舌根的下颌第一磨牙,其中男82例,女69例,其发生率在不同性别人群中没有显著性差异(P=0.205),右侧(n=122,12.20%)和左侧(n=129,12.90%)下颌第一磨牙中的发生率也没有显著差异(P=0.610).这部分患者中有65.56% (99/151)的双侧下颌第一磨牙均为远舌根.结论 上海地区中国人远舌根的发生较普遍,且有较高的对称性.%Objective This study assessed the prevalence of mandibular three-rooted permanent first molars among Chinese in Shangrnhai. Methods This study was a randomized trial. A total of 500 patients possessing both mandibular first molars were selected. This rnstudy evaluated the prevalence of mandibular three-rooted permanent first molars using panoramic radiographs. Results One hundred rnand fifty-one ( 151/500,30.20％ )patients were found to have a mandibular three-rooted first molar, eighty-two males and sixty-nine fernmales (P = 0. 205 ). The occurrence of such permanent three-rooted mandibular first molars did not differ significantly between the rnright side (n = 122, 12.20％ ) and the left side (n = 129, 12.90％; P =0.610). 65.56％ (99/151) of all the patients were with birnlateral three-rooted molars. Conclusions The prevalence and bilateral incidence of mandibular three-rooted first molars among in Chirnnese Shanghai population was high.
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