曾寿金,王靖,何伟辉,等.基于SLM的梯度多孔牙种植体力学特性[J].精密成形工程,2023,15(1):61-70.
ZENG Shou-jin,WANG Jing,HE Wei-hui,et al.Mechanical Properties of Gradient Porous Dental Implants Based on SLM[J].Journal of Netshape Forming Engineering,2023,15(1):61-70. |
| 基于SLM的梯度多孔牙种植体力学特性 |
| Mechanical Properties of Gradient Porous Dental Implants Based on SLM |
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| DOI：10.3969/j.issn.1674-6457.2023.1.008 |
| 中文关键词: 选区激光熔化 牙种植体 多孔结构设计 力学性能 有限元分析 |
| 英文关键词: laser selective melting dental implants porous structure design mechanical properties finite element analysis |
| 基金项目:国家自然科学基金(51575110);福建省自然科学基金(2021J011053);福建省区域发展项目(2020H4003);福建省科技型中小企业技术创新资金项目(2022C0027) |
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| 中文摘要: |
| 目的 确定既满足强度要求又能够有良好长期稳定性的梯度多孔牙种植体最佳孔隙值。方法 设计4组不同孔隙率(G30、G40、G50、G60)的梯度多孔结构样件及均质多孔样件S30，选区激光熔化(SLM)成型后通过准静态压缩试验对其力学性能进行研究，测量出样件的弹性模量和屈服强度。通过有限元分析评估不同孔隙率种植体及对应下颌骨组织的应力分布。结果 相较于实体钛合金结构(110 GPa)，多孔结构的弹性模量(13.47~15.88 GPa)已完全符合人体自然骨组织(2~20 GPa)范围，多孔结构屈服强度(484.81~834.47 MPa)远高于皮质骨(180.5~211.7 MPa);梯度多孔结构样件弹性模量相较于均质多孔结构略有提升，屈服强度(834.47 MPa)比均质多孔结构样件(730.56 MPa)提高了约14%。梯度多孔种植体周围皮质骨最大等效应力值分布在43.362 9~45.015 4 MPa之间，松质骨最大等效应力值分布在4.756 58~ 5.055 6 MPa之间，完全满足2~60 MPa范围内的最大应力，适合骨组织生长。种植体与下颌骨之间的应力差值随着孔隙率的增大而逐渐变大，孔隙率为30%的TPMS–G型梯度多孔牙种植体与下颌骨应力差值最小，生物力学特性最佳，有利于形成稳定的骨整合。结论 通过试验及仿真模拟，确定了适用于种植体的最佳梯度多孔结构，既满足强度要求，又具有良好的长期稳定性。 |
| 英文摘要: |
| The work aims to determine the optimal porosity of gradient porous dental implants that meet the strength requirements and have good long-term stability. Four groups of gradient porous structure samples with different porosity (G30, G40, G50, G60) and homogeneous porous sample S30 were designed. After selective laser melting (SLM) molding, their mechanical properties were studied through quasi-static compression experiments, and the elastic modulus and yield strength of the samples were measured. The stress distribution of different porosity implants and corresponding mandibular tissues was evaluated by finite element analysis. Compared with the solid titanium alloy structure (110 GPa), the elastic modulus of porous structure (13.47-15.88 GPa) fully met the range of human natural bone tissue (2-20 GPa), and the yield strength of porous structure (484.81-834.47 MPa) was much higher than that of cortical bone (180.5-211.7 MPa); the elastic modulus of the gradient porous structure sample was slightly higher than that of the homogeneous porous structure, and the yield strength (834.47 MPa) was about 14% higher than that of the homogeneous porous structure sample (730.56 MPa). The maximum equivalent stress of cortical bone around gradient porous implant was 43.362 9-45.015 4 MPa, and the maximum equivalent stress of cancellous bone was 4.756 58-5.055 6 MPa, which fully met the maximum stress in the range of 2-60 MPa and was suitable for bone tissue growth. The stress difference between the implant and the mandible gradually increased with the increase of porosity. The TPMS-G gradient porous dental implant with 30% porosity had the smallest stress difference with the mandible, and had the best biomechanical properties, which was conducive to the formation of stable bone integration. Through experiments and simulation, the optimal gradient porous structure suitable for the implant is determined, which not only meets the strength requirements but also has good long-term stability. |
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