关键词: 应力, 基牙, 位移

Abstract: Objective To study stress distribution and displacement of abutment of middle implant-natural teeth fixed bridge under different loading. Methods The stress distribution and displacement of abutment were studied and analyzed by means of three-dimensional finite element when different loading was applied. Results The biggest stress of middle implant was 4-5 times as big as that of natural teeth. Under concentrated vertical loading, the biggest stress of implant was about 2 times higher than that under dispersed vertical loading. There was no significant difference of biggest stress on the implant between concentrated oblique loading and dispersed oblique loading. The biggest stress of implant under oblique loading was 3 times as big as that under dispersed vertical loading. The biggest stress of natural teeth under dispersed loading was lower than that under concentrated loading. The maximum displacement of implant in occlusal-gum direction was great lower than that of natural teeth. Both in buccal-lingual direction and medial-distal direction, the displacement of implant were about equal to that of natural teeth. Conclusion The oblique loading is the main force to destroy the middle implant-natural teeth fixed bridge. The lean of cusp should be reduced .The abnormally high occlusal points should be deleted. The bite points should be well distributed. The fixed bridge is feasible.

Key words: stress, abutment, displacement