Demirel Mehmet Gökberkkaan, Mohammadi Reza, Keçeci Murat
Department of Prosthodontics, Faculty of Dentistry, Necmettin Erbakan University, Konya 42090, Turkey.
Faculty of Dentistry, Necmettin Erbakan University, Konya 42090, Turkey.
J Funct Biomater. 2023 Sep 21;14(9):484. doi: 10.3390/jfb14090484.
Dental ceramics are susceptible to slow, progressive crack growth after cyclic loading. The purpose of this study was to investigate the progressive patterns of cracks in two different types of CAD/CAM ceramic materials used with three different partial posterior indirect restoration (PPIR) designs and to determine the materials' failure risk using a fatigue test. Standard initial cracks were formed in Standard Tessellation Language (STL) files prepared for three different PPIRs. The materials chosen were monolithic lithium disilicate (LS) and polymer-infiltrated ceramic networks (PICNs). The extended finite element method (XFEM) was applied, and the fatigue performance was examined by applying a 600 N axial load. The cracks propagated the most in onlay restorations, where the highest displacement was observed. In contrast, the most successful results were observed in overlay restorations. Overlay restorations also showed better fatigue performance. LS materials exhibited more successful results than PICN materials. LS materials, which can be used in PPIRs, yield better results compared to PICN materials. While inlay restorations demonstrated relatively successful results, overlay and onlay restorations can be specified as the most and the least successful PPIR types, respectively.
牙科陶瓷在循环加载后易出现缓慢的、渐进性的裂纹扩展。本研究的目的是调查两种不同类型的CAD/CAM陶瓷材料在三种不同的后牙部分间接修复（PPIR）设计中裂纹的渐进模式，并通过疲劳试验确定材料的失效风险。在为三种不同的PPIR准备的标准镶嵌语言（STL）文件中形成标准初始裂纹。所选材料为整体式二硅酸锂（LS）和聚合物渗透陶瓷网络（PICN）。应用扩展有限元法（XFEM），并通过施加600 N轴向载荷来检查疲劳性能。裂纹在高嵌体修复体中扩展最多，在高嵌体修复体中观察到最高位移。相比之下，在覆盖修复体中观察到最成功的结果。覆盖修复体也表现出更好的疲劳性能。LS材料比PICN材料表现出更成功的结果。可用于PPIR的LS材料与PICN材料相比产生更好的结果。虽然嵌体修复显示出相对成功的结果，但覆盖修复和高嵌体修复可分别指定为最成功和最不成功的PPIR类型。
