ABSTRACT

Selective laser melting (SLM) was used to process commercially pure titanium (Grade 1 ELI CP Ti) dental root-analogue implant (RAI) with oval cross-section abutment (OCSA) design. The RAI was tested with a fatigue test system according to ISO 14801, maximum compression load is 350 N, 450 N and 500 N, the load tilt angle is 30°, R = 0.1. To simulate the stress distribution of implant and alveolar bone, a finite-element model was established. The elastic modulus of implant materials was set to 90 GPa and 110 GPa to simulate CP Ti and Ti-6Al-4V, respectively. 300 N vertical or 300 N vertical/50 N horizontal occlusal loading was applied. The biomechanical behaviour of peri-implant bone was recorded. Fatigue strength of RAI sample was 500 N. The simulation results showed that at 300 N vertical loading or 300 N vertical/50 N horizontal loading, compared with Ti-6Al-4V, CP Ti had lower von Mises stress on implant and abutment which reduces the risk of failure compared to their respective strength levels; meanwhile, higher von Mises stress on alveolar bone reduces stress shielding. The study underscores that the CP Ti and SLM are favourable for the fabrication of RAI.

摘要

选择性激光熔化 (SLM) 用于加工具有椭圆形横截面基台 (OCSA) 设计的商业纯钛（1 级 ELI CP Ti）牙根模拟种植体 (RAI)。根据 ISO 14801 使用疲劳测试系统对 RAI 进行测试，最大压缩载荷为 350 N、450 N 和 500 N，载荷倾斜角为 30°，R = 0.1。为了模拟种植体和牙槽骨的应力分布，建立了有限元模型。植入材料的弹性模量分别设置为 90 GPa 和 110 GPa 以模拟 CP Ti 和 Ti-6Al-4V。施加 300 N 垂直或 300 N 垂直/50 N 水平咬合载荷。记录种植体周围骨的生物力学行为。RAI 样品的疲劳强度为 500 N。 模拟结果表明，在 300 N 垂直载荷或 300 N 垂直/50 N 水平载荷下，与 Ti-6Al-4V 相比，CP Ti 在种植体和基台上的 von Mises 应力较低，与它们各自的强度水平相比，这降低了失败的风险；同时，牙槽骨上较高的 von Mises 应力会降低应力屏蔽。该研究强调，CP Ti 和 SLM 有利于 RAI 的制造。