Alshamrani Abdullah, Fahimipour Amir, Alsarani Majed, Ellakwa Ayman
Department of Dental Health, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia.
Oral rehabilitation & Dental Biomaterial and Bioengineering, The University of Sydney, Sydney, New South Wales, Australia.
Aust Dent J. 2025 Mar;70(1):58-69. doi: 10.1111/adj.13048. Epub 2024 Dec 2.
This study evaluates the mechanical properties of dental crown prosthodontic materials by investigating the flexural strength and stress distribution of various ceramic materials, including milled zirconia and two ceramics fabricated using LCM technology, employing Finite Element Analysis (FEA).
Seventy-five samples were divided into five groups: milled zirconia, Zirconia-210, Zirconia-230, Alumina-350 and Alumina-500. Flexural strength tests, including three-point bending, Weibull analysis and FEA, were conducted to analyse stress distribution. Data were evaluated using one-way ANOVA and Tukey's test.
3D-printed zirconia showed superior flexural strength compared to milled zirconia and alumina. Zirconia-210 had the highest flexural strength (886.35 MPa), while Alumina-350 had the lowest (424.49 MPa). Alumina-350 exhibited higher von Mises stress (25.77 MPa) than the control group (22.83 MPa), whereas Alumina-500 had the lowest stress (22.65 MPa). Zirconia models showed a slight increase in von Mises strain, while alumina models showed a decrease compared to the control.
Our study found that 3D-printed zirconia displayed higher flexural strength when compared to milled zirconia and alumina. Moreover, there were noticeable variations in stress levels and strain behaviours observed in the materials.
本研究通过有限元分析（FEA）研究包括铣削氧化锆和两种使用LCM技术制造的陶瓷在内的各种陶瓷材料的抗弯强度和应力分布，以评估牙冠修复材料的力学性能。
75个样本分为五组：铣削氧化锆、氧化锆-210、氧化锆-230、氧化铝-350和氧化铝-500。进行了抗弯强度测试，包括三点弯曲、威布尔分析和有限元分析，以分析应力分布。使用单因素方差分析和Tukey检验对数据进行评估。
3D打印氧化锆的抗弯强度优于铣削氧化锆和氧化铝。氧化锆-210的抗弯强度最高（886.35MPa），而氧化铝-350的抗弯强度最低（424.49MPa）。氧化铝-350的冯·米塞斯应力（25.77MPa）高于对照组（22.83MPa），而氧化铝-500的应力最低（22.65MPa）。氧化锆模型的冯·米塞斯应变略有增加，而氧化铝模型与对照组相比应变有所降低。
我们的研究发现，与铣削氧化锆和氧化铝相比，3D打印氧化锆具有更高的抗弯强度。此外，材料中的应力水平和应变行为存在明显差异。
