【摘要】 目的　调查老年人楔状缺损发病情况及其相关因素。方法　使用Smith 磨损指数调查分析407 例老年知识分子牙齿楔状缺损发病情况及用问卷方式调查与病损发生发展可能相关的因素。结果　该组老年人楔状缺损的发病率为97 .3 % ,且随年龄递增;楔状缺损的好发部位和缺损程度第一双尖牙列首位,其次为第二双尖牙,第一磨牙;其中第一磨牙比以往人们认为的尖牙更好发楔状缺损。另外,发现该组人群中有69 例171 颗患牙舌侧有不同程度的楔状缺损。相关因素的调查结果分析表明:刷牙次数、甜酸饮食习惯、胃返酸等因素与楔状缺损的发病率及程度无明显关系。牙齿牙合面磨损程度与楔状缺损程度的牙位分布并不一致。结论　为牙合力疲劳可能是楔状缺损形成的一个重要原因提供了一些参考资料更多还原

【Abstract】 Objective Wedge-shaped defects and relevant factors were investigated in elder intellectuals.MethodsThe depth loss of wedge-shaped defects was evaluated with Smith tooth wear index and the relevant factors were investigated with inquiry.Results The incidence of wedge-shaped defects reached 97.3 %,and the frequency of involved teeth was:first premolar,second premolar,first molar,cuspid.Furthmore wedge-shaped defects involving the lingual surface of 171 teeth from 69 patients were discovered.No significant relationship was observed between incidence of wedge-shaped defects and toothbrushing or dietary erosion or regurgitation erosion in the group.The distribution of tooth position for tooth wear of occlusal surface differed from that for wedge-shaped defcts.Conclusions The results suggest some clues to support that occlusal fatigue is one of the important causative factors of wedge-shaped defects.更多还原