目的　研究恒牙根尖部侧孔 ,为临床和国人提供解剖学资料。方法　采用XTL 2型连续变倍体视摄影显微镜 ,对 15 0 2个恒牙根尖部出现的 2 30个侧孔的形状和孔径进行观测。结果　2 30颗恒牙根尖部侧孔的形状可分为 4型 :圆形 141个 ,占 6 1 30 % ;椭圆形 85个 ,占 36 96 % ;肾形 3个 ,占 1 30 % ;不规则形 1个 ,占 0 43%。结论　恒牙根尖部侧孔的孔径为根尖孔的一半 ,并约有 1/7的恒牙出现根尖部侧孔 Objective To study the apical side hole of permanent teeth and to provide anatomical data for clinicians and people. Methods The shape and pore size of 2 30 lateral holes appearing in the apical portion of 15 0 2 permanent teeth were observed by XTL 2 continuous zoom stereo microscope. Results The shapes of the lateral apices of 30 permanent teeth could be divided into 4 types: 141 were round, 6 1 30% were ovate; 85 were elliptical, accounting for 36 96%; 3 were kidney, accounting for 130%; A regular form, accounting for 0 43%. Conclusions The diameter of the apical hole in the tip of the permanent tooth is half of the apical foramen, and about 1/7 of the permanent teeth show apical lateral hole