目的：探索牙 合面磨耗对下颌第一磨牙牙 体长轴倾斜程度的影响和意义。方法：从本教研室收藏的3418 个下颌第一磨牙中，按下列标准选出3组牙齿进行 微机测量。Ⅰ组：无磨耗组，18个，代表年轻组；Ⅱ组：严重磨耗组，26个，代表年长组； Ⅲ组：牙 合面深龋组，18个，代表功能减弱组。样 本中所有牙均选双根者，由三位作者遵三盲 法进行。结果：Ⅱ组牙冠相对于牙根更向近中倾斜，与Ⅰ组有明显 差异（P<0.01），而Ⅲ组与Ⅰ组无明显 差别。结论：重度磨耗的下颌第一磨牙，牙体长轴的倾斜程度明显 大于无明显磨耗组，其机制可能与咬合功能刺激有关。%AIM: To investigate the characteristics and significan ce of the effect of tooth occlusal surface wear on the long axis of the mandibul ar first molar tooth. METHODS: Three groups of mandibular first m olar tooth were selected from 3418 collections in our department. Group I: inclu ding 18 teeth without obvious attrition, representing those of young age. Group Ⅱ: including 26 teeth with serious attrition, representing the aged ones. Group Ⅲ: including 18 teeth with deep carries on their occlusal surface, representi ng the weak functioning ones. Only those with two roots were included to make th e measurement comparatively. Three-blind methods were taken through the study. RESULTS: It was found that the tooth crow ns in Group II inclined more medially than those in Group I (P<0.01). No dif ference was found between Group I and Ⅲ. CONCLUSION: In comparing with the non-wear tooth the long axis of the mandibular first mo lar t ooth with serious wear of occlusal surface inclined even significantly implying that the effect of occlusion functional stimulation may be involved.
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