Objective:To investigate the influence of occlusal surface morphology on stress distribution in the base of maxillary complete dentures(MCD).
目的：探讨异常牙合面形态对上颌全口义齿基托应力分布状况的影响。
Objective: to observe the effects of different root canal file and the restoration of occlusal surface on the fracture resistance of premolars.
目的：观察不同根管锉预备根管及不同面充填物对前磨牙牙体抗折强度的影响。
Serious tooth defect which involved cuspid, incisal Angle, marginal ridge and occlusal surface can't be filled and need occlusal reconstruction.
各种严重的牙体缺损已涉及牙尖、切角、边缘嵴以及合面，需要咬合重建而不能使用一般充填修复者。
Methods: 244 teeth with pulpitis were randomly divided into two groups and then mummification of dental pulp were performed through occlusal surface or cervical surface.
方法：244例牙髓炎患牙随机分二组，分别从牙合面和牙颈部开髓完成干髓术，比较疗效。
Most caries were minor in degree of severity, and mostly lie in the occlusal and proximal surface.
龋齿主要为浅龋，咬合面和邻面龋占绝大多数。
To achieve ideal occlusal relationship and improved surface shape, orthodontic is especially important before and after DO.
为实现面型改善和理想咬合的统一，需要对颌骨牵引方向进行正畸辅助调控和术后精细咬合调整。
To achieve ideal occlusal relationship and improved surface shape, orthodontic is especially important before and after DO.
为实现面型改善和理想咬合的统一，需要对颌骨牵引方向进行正畸辅助调控和术后精细咬合调整。
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