在不同的牙槽骨高度时，牙槽嵴顶部的牙周膜是应力集中的部位。
The stress in the periodontal ligament near apex increased more rapidly than that near the alveolar bone crest.
目的 ：分析不同牙槽嵴顶间线角角度与全口义齿排牙之间的关系。
Objective:To analyse on the relationship between the interridge crest line angle and the tooth arrangement of complete denture.
结果结合牙龈环切的正畸治疗后患牙牙槽嵴顶高度增加，产生新附着。
Results Orthodontic treatment with circumferential fibrotomy can make new attachment and increase the height of crest bone.
结论：1倾斜移动内收上颌组牙时，各个牙的牙槽嵴顶部和根尖部都有明显的应力集中区域。
Conclusions: 1 the stress is concentrated in alveolar bone crest and apex area of the maxillary anterior teeth while they are in tipping movement.
目的：介绍采用骨挤压器从牙槽嵴顶入路提升上颌窦底后植入种植体，观察该方法窦底提升后种植的临床效果。
Objective: Introduce the use of osteotomes to elevate the sinus floor from alveolar ridge at the time of implant placement .
目的：介绍采用骨挤压器从牙槽嵴顶入路提升上颌窦底后植入种植体，观察该方法窦底提升后种植的临床效果。
Objective: Introduce the use of osteotomes to elevate the sinus floor from alveolar ridge at the time of implant placement .
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