Abstract: Objective To analyze the effect of clenched bruxism on implants and peri-implant bone by three dimensional finite element analysis. Methods A distal free-end edentulous model with occlusion relationship was established by CBCT scanning of an adult bruxism volunteer through contour extraction, 3D remodeling and Boolean calculation. Two Ankylos C/X 4.5 ×11 mm implants were designed by parametric modeling technology. After the model was assembled, the von Mises stress distribution on the implant and peri-implant bone was analyzed by simulating the clenched bruxism load and the normal masticatory load respectively. Results The stress in the implant and abutment was mainly concentrated on the buccal and lingual sides of the implant, and the stress in the peri-implant bone was mainly concentrated on the buccal and lingual cortical bone in contact with the implant under two loads. The maximum von Misese and high stress distribution area of the implants and peri-implants bone under clenched load were greater than those of under normal masticatory load. In the first molar area, the maximum von Mises in the per-implant bone was 163.27 MPa under clenched load and 24.02 MPa under masticatory load. In the second molar area, it reached to 135.52 MPa and 16.94 MPa respectively. Conclusions Compared with normal masticatory load, clenched bruxism may lead to excessive stress concentration in the implant and the surrounding cortical bone.

Key words: bruxism, implant, finite element analysis, von Mises stress, peri-implant bone