关键词: 三维有限元, 单端固定桥, 游离端缺失

Abstract: Abstract:Objective To analyze the stress distribution of abutment and alveolar ridge between two kinds of distal-extention absence dentures,and provide evidence for the application of different dentures in clinic. Methods Attachment　 denture and cantilever fixed bridge were used to restore the distal-extention absence respectively,the stress distribution of abutment and alveolar ridge was compared by three-dimensioal finit element method.Results The stress peak values of abutmen root,periodontal membrance,alveolar ridge were (1.42E+5 )MPa,(1.33E+4)MPa and (3.49E+5)MPa, respectively, in attachment denture;while in cantilever fixed bridge,the stress peak values of them were (1.45E+7)MPa and (2.25E+6) MPa, (1.45E+3)MPa, respectively.And the stress peak values of these two kinds of dentures were all located in the mid-upper 1/3 and the cervical of abutment.Conclusion Compared with cantilever fixed bridge, the attachment denture could decrease the stress of abutment and be helpful to its protection,the hight of residual alveolar ridge should be taken into account when the two kinds of dentures are used for distal-extention absence.

Key words: three-dimensional finite element, cantilever fixed bridge, distal-extension absence