Elsherbini Ahmed, Fathy Salma M, Al-Zordk Walid, Özcan Mutlu, Sakrana Amal A
Department of Oral-Maxillofacial Surgery, Dentistry and Orthodontics, Tissue Engineering Division, The University of Tokyo, Tokyo 113-0033, Japan.
Dental Biomaterials Department, Faculty of Oral and Dental Medicine, Zagazig University, Zagazig 44519, Egypt.
Dent J (Basel). 2025 Mar 6;13(3):117. doi: 10.3390/dj13030117.
: Fabrication of ceramic restorations with higher performance, biocompatibility, and mechanical durability, as well as excellent optical properties, is challenging. Therefore, this study was designed to investigate the mechanical properties and surface roughness of different glass ceramics manufactured with CAD/CAM and pressed techniques before and after exposure to simulated gastric acidic challenge. : Lithium disilicate-based (LDS) ceramic, advanced lithium disilicate (ALDS), and zirconia-reinforced lithium silicate (ZLSC), were manufactured with two techniques. Disc-shaped (N = 336) specimens were used to test the biaxial flexural strength (BFS), while surface microhardness and surface roughness were evaluated before and after exposure to hydrochloric acid (34-37% concentration and 1.2 pH for 24 h). The results were statistically evaluated using two- and one-way ANOVA, Tukey's post-hoc and Student's -test. : Both CAD and pressed types of LDS ceramic IPS e.max, showed significantly highest BFS and microhardness before and after acidic challenge ( = 0.01 and <0.01, respectively). ALDS and ZLSC showed significantly lower roughness before acidic aging, while all groups showed no significant difference after aging. : Pressed groups showed better mechanical performance than CAD groups. LSD (IPS e.max types) continuously showed a better mechanical performance than modified LDS. ALDS and ZLSC showed the best performance in terms of surface smoothness, but after acidic exposure, no significant difference was observed compared to the other groups.
制造具有更高性能、生物相容性、机械耐久性以及出色光学性能的陶瓷修复体具有挑战性。因此，本研究旨在调查采用CAD/CAM和压制技术制造的不同玻璃陶瓷在暴露于模拟胃酸挑战前后的机械性能和表面粗糙度。基于二硅酸锂（LDS）的陶瓷、高级二硅酸锂（ALDS）和氧化锆增强硅酸锂（ZLSC），采用两种技术制造。使用圆盘形（N = 336）试样测试双轴弯曲强度（BFS），同时在暴露于盐酸（浓度34 - 37%，pH值1.2，持续24小时）前后评估表面显微硬度和表面粗糙度。结果使用双因素和单因素方差分析、Tukey事后检验和学生t检验进行统计学评估。CAD和压制类型的LDS陶瓷IPS e.max在酸性挑战前后均显示出显著最高的BFS和显微硬度（分别为P = 0.01和P < 0.01）。ALDS和ZLSC在酸性老化前显示出显著更低的粗糙度，而所有组在老化后均无显著差异。压制组显示出比CAD组更好的机械性能。LSD（IPS e.max类型）持续显示出比改性LDS更好的机械性能。ALDS和ZLSC在表面光滑度方面表现最佳，但在酸性暴露后，与其他组相比未观察到显著差异。
