Abstract:

Objective To determine the optimal thread pitch for an experimental cylinder implant in Ansys Workbench
Design Xplorer environment. Methods Finite element models of segment jaw bone with a V- shaped thread
implant were created. The thread pitc（h P）was set from 0.5 mm to 1.6 mm. The maximum Equivalent stresse（s EQV
stresses） in jaw bone and in implant were evaluated. Results Under axial load, the amplification of maximum EQV
stresses in cortical bone, cancellous bone and implant were 7.1%, 123.4% and 28.7% respectively. Under buccolingual
load, the amplification of maximum EQV stresses in cortical bone, cancellous bone and implant were 2.8%,
28.8% and 14.9% respectively. When P exceeded 0.8 mm, the response curve curvature of maximum EQV stresses in
jaw bone and in implant to P was ranged from - 1 to 1. Conclusion Stresses in cancellous bone are more sensitive
to thread pitch than in cortical bone. Stresses in jaw bone under axial load are easier affected by thread pitch than
under bucco- lingual load. Thread pitch plays a greater role in protecting dental implant under axial load than under
bucco- lingual load. Thread pitch exceed 0.8 mm should be the optimal design in a cylinder implant, but oversized
pitch should be avoided too.

Key words: dentalimplant, three-dimensionalfiniteelementanalysis, optimizeddesign