解放军医学院学报2026，Vol.47Issue(5)：456-462,7.DOI:10.12435/j.issn.2095-5227.26012304
数字光处理制备金刚石结构多孔氮化硅陶瓷的孔径调控与力学性能
Aperture regulation and mechanical properties of diamond-structured porous silicon nitride ceramics fabricated by digital light processing
摘要
Abstract
Background Silicon nitride(Si3N4)is a promising bioceramic material for dental applications,and digital light processing(DLP)is an advanced 3D printing(additive manufacturing)technology with high fabrication precision.However,there is a paucity of systematic investigations on DLP-fabricated porous Si3N4 dental implants with Diamond-type triply periodic minimal surfaces(TPMS)architecture.Objective To fabricate porous Si3N4 ceramics with Diamond-type TPMS architecture and a pore size gradient ranging from 300 to 600 μm via DLP technology,characterize their microstructure and mechanical properties,and identify the optimal pore size parameters suitable for dental implant applications.Methods Based on the topological characteristics of Diamond-type TPMS structure,three-dimensional models with four different pore sizes(300,400,500,and 600 μm)were designed with a fixed unit cell size.The fluctuation of total porosity among each group was strictly controlled within 5%to establish a single-factor experimental system with pore size as the sole variable.Green bodies were printed via DLP technology and sintered at high temperature to prepare specimens,with 5-6 replicate specimens set for each group.The phase composition and microstructure of the materials were characterized by X-ray diffractometer(XRD)and scanning electron microscope(SEM).Total porosity was measured by the Archimedes method.The flexural strength and elastic modulus of the specimens were tested using a universal mechanical testing machine in accordance with ISO 14704-2016 and GB/T 10700-2006 standards.One-way analysis of variance(ANOVA)was used for statistical comparison of data among groups.Results The main crystalline phase of the as-prepared samples was β-Si3N4,with an intact macrostructure and a three-dimensionally interconnected pore network.As the designed pore size increased,the total porosity of the samples increased in a gradient manner from 45.04%to 50.06%,the flexural strength decreased monotonically from(110.69±1.25)MPa to(74.47±1.05)MPa,and the elastic modulus exhibited a stepwise non-linear increase accompanied by minor fluctuations throughout the variation.There were statistically significant differences in all core mechanical parameters among the groups(P＜0.001).Notably,the group with a designed pore size of 300 μm presented the optimal combination of mechanical properties,with the highest flexural strength of(110.69±1.25)MPa and a low elastic modulus of(13.45±0.20)GPa,which was highly consistent with the mechanical parameter range of human mandibular cortical bone.Conclusion Tailoring the pore size parameters of Diamond-type TPMS structure can effectively and synergistically regulate the pore characteristics and mechanical response properties of porous Si3N4 ceramics.The 300 μm pore size structure achieves the optimal balance between high strength and low modulus,with excellent mechanical compatibility with bone tissue.It provides core experimental basis and data support for the optimal design of the porous surface structure of high-performance"dense core-porous surface"gradient Si3N4 dental implants.关键词
氮化硅/数字光处理/三周期极小曲面/牙种植体/力学性能Key words
silicon nitride/digital light processing/triply periodic minimal surfaces/dental implant/mechanical properties分类
医药卫生引用本文复制引用
王万宇,陈妍如,史志芸,冯暄淇,邓斌..数字光处理制备金刚石结构多孔氮化硅陶瓷的孔径调控与力学性能[J].解放军医学院学报,2026,47(5):456-462,7.基金项目
国家自然科学基金(52172133) （52172133）
