PURPOSE: To study the stress of the abutment and its periodontal tissue with different designs of retainer (type of retainer, place) in the same situation of dentural defect.

• 摘要目的：探讨在相同的缺牙病例中，不同的固位体设计（固位体的类型、放置的位置）对牙颌组织的力学影响。