华西口腔医学杂志2025，Vol.43Issue(2)：175-182,8.DOI:10.7518/hxkq.2025.2024335
浆料配比对3D打印牙科二硅酸锂陶瓷的微观结构和性能的影响
Effect of slurry proportion on the microstructure and properties of dental lithium disilicate ceramics manufac-tured through 3D printing
摘要
Abstract
Objective This study aims to use 3D prin-ting technology based on the principle of stereo lithogra-phy apparatus(SLA)to shape dental lithium disilicate ceramics and study the effects of different slurry proportions on the microstructure and properties of heat-treated sam-ples.Methods The experimental group comprised lithium disilicate ceramics manufactured through SLA 3D printing,and the control group comprised lithium disilicate ceramics(IPS e.max CAD)fabricated through commercial milling.An array of different particle sizes of lithium disilicate ceramic powder materials(nano and micron)was selected for mixing with photocurable acrylate resin.The proportion of experimental raw materials was adjusted to prepare five groups of ce-ramic slurries for 3D printing(Groups S1-S5)on the basis of rheological properties,stability,and other factors.Printing,debonding,and sintering were conducted on the experimental group with the optimal ratio,followed by measurements of microstructure,crystallographic information,shrinkage,and mechanical properties.Results Five groups of lithium dis-ilicate ceramic slurries were prepared,of which two groups with high solid content(75%)(Groups S2 and S3)were se-lected for 3D printing.X-ray diffraction and scanning electron microscopy results showed that lithium disilicate was the main crystalline phase in Groups S2 and S3,and its microstructure was slender,uniform,and compact.The average grain sizes of Groups S2 and S3 were(559.79±84.58)nm and(388.26±61.49)nm,respectively(P<0.05).Energy spectroscopy revealed that the samples in the two groups contained a high proportion of Si and O elements.After heat treatment,the shrinkage rate of the two groups of ceramic samples was 18.00%-20.71%.Test results revealed no statistical difference in all mechanical properties between Groups S2 and S3(P>0.05).The flexural strengths of Groups S2 and S3 were(231.79±21.71)MPa and(214.86±46.64)MPa,respectively,which were lower than that of the IPS e.max CAD group(P<0.05).The elasticity modulus of Groups S2 and S3 were(87.40±12.99)GPa and(92.87±19.76)GPa,respectively,which did not significantly differ from that of the IPS e.max CAD group(P>0.05).The Vickers hardness values of Groups S2 and S3 were(6.53±0.19)GPa and(6.25±0.12)GPa,respectively,which were higher than that of the IPS e.max CAD group(P<0.05).The fracture toughness values of Groups S2 and S3 were(1.57±0.28)MPa·m0.5 and(1.38±0.17)MPa·m0.5,respectively,which did not significantly differ from that of the IPS e.max CAD group(P>0.05).Conclu-sion The combination of lithium disilicate ceramic powders with different particle sizes can yield a slurry with high solid content(75%)and suitable viscosity and stability.The dental lithium disilicate ceramic material is successfully pre-pared by using 3D printing technology.The 3D-printed samples show a small shrinkage rate after heat treatment.Their microstructure conforms to the crystal phase of lithium disilicate ceramics,and their mechanical properties are close to those of milled lithium disilicate ceramics.关键词
3D打印/立体光固化成型技术/二硅酸锂/牙科陶瓷/浆料配比Key words
3D printing/stereo lithography apparatus/lithium disilicate/dental ceramics/slurry proportion分类
口腔医学引用本文复制引用
林保欣,陈小瑄,李如意,万乾炳,裴锡波..浆料配比对3D打印牙科二硅酸锂陶瓷的微观结构和性能的影响[J].华西口腔医学杂志,2025,43(2):175-182,8.基金项目
National Key Research and Development Program(2022YFC2410103) （2022YFC2410103）
National Natural Science Foun-dation(82471021) 国家重点研发计划(2022YFC2410103) （82471021）
国家自然科学基金(82471021) （82471021）
