나사 형상 조건에 따른 치과용 임플란트 나사의 유한요소해석

초록

This study investigates the effect of thread pitch on stress-concentration behavior in a dental-implant screw system using three-dimensional finite-element analysis. A dental implant assembly comprising a fixture, abutment, and anterior and posterior screws is modeled, and functional occlusal loading conditions are applied to simulate clinical mastication forces. The numerical results reveal that thread pitch governs stress redistribution within the implant system. As the pitch decreases, the maximum stress in the anterior screw increases, whereas the posterior screw exhibits a reduction in peak stress, i.e., the opposite trend. This behavior indicates that pitch variation modifies the load-sharing mechanisms between screw locations, instead of merely altering the overall stress magnitude. Such redistribution is attributed to variations in load-transfer paths and local stiffness at the implant-abutment interface. These findings indicate that thread pitch is a design-sensitive geometric parameter that affects position-dependent stress concentrations in dental implants. Therefore, pitch optimization provides an effective strategy for controlling load distributions and enhancing mechanical stability, thereby improving the long-term reliability of implant screw systems under clinical loading conditions.

키워드