Huo面磨耗对下颌第一磨牙牙体长轴倾斜程度影响的解剖测量研究

目的：探索Huo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：Huo面深龋组，18个，代表功能减弱组。样本中所有牙均选以根者，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。

The effect of toothocclusal surface wear on the inclination of the firstmandibular molar tooth long axis: Ananatomic measurement study

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.