Karaer Oğuzcan, Yamaguchi Satoshi, Nakase Yutaro, Lee Chunwoo, Imazato Satoshi
Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, 06560, Turkey.
Department of Biomaterials Science, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan.
J Mech Behav Biomed Mater. 2020 Apr;104:103697. doi: 10.1016/j.jmbbm.2020.103697. Epub 2020 Feb 13.
The aim of this study was to assess the validity of in silico models of three-point bending tests to reflect in vitro physical properties obtained from three commercially available computer-aided design/computer-aided manufacturing (CAD/CAM) resin composite blocks and demonstrate notchless triangular prism analysis with those properties.
Three types of commercially available CAD/CAM resin composite blocks were used: Cerasmart 300 (CS300; GC, Tokyo, Japan), Katana Avencia P Block (AP; Kuraray Noritake Dental, Tokyo, Japan), and KZR CAD HR3 Gamma Theta (GT; Yamakin, Osaka, Japan). In vitro/in silico three-point bending tests were conducted to obtain elastic modulus and fracture strain for non-linear dynamic finite element analysis (n = 10/each). Fractured surfaces of specimens after in vitro NTP tests were observed, and the fracture toughness of each CAD/CAM resin composite was obtained by in silico NTP analysis.
Both in vitro and in silico load-displacement curves obtained from three-point bending tests were significantly correlated (p < 0.05). The elastic moduli of CS300, AP, and GT were 8.0 GPa, 10.0 GPa, and 9.0 GPa, respectively. The fracture toughness values obtained from in silico NTP analysis of CS300, AP, and GT were 5.057 MPa m, 4.193 MPa m, and 4.880 MPa m, respectively. There was no significant difference in the length of the stable region among the three CAD/CAM resin composites (p = 0.09).
The in silico approach established in this study showed acceptable reflection of in vitro physical properties and will be useful for assessing fracture toughness related to the longevity of CAD/CAM resin composites without wastage of materials.
本研究旨在评估三点弯曲试验的计算机模拟模型反映从三种市售计算机辅助设计/计算机辅助制造（CAD/CAM）树脂复合块获得的体外物理性能的有效性，并展示基于这些性能的无缺口三棱柱分析。
使用了三种市售的CAD/CAM树脂复合块：Cerasmart 300（CS300；GC，东京，日本）、Katana Avencia P Block（AP；可乐丽诺瑞特牙科，东京，日本）和KZR CAD HR3 Gamma Theta（GT；山金，大阪，日本）。进行体外/计算机模拟三点弯曲试验以获得用于非线性动态有限元分析的弹性模量和断裂应变（每种n = 10）。观察体外无缺口三棱柱试验后试样的断裂表面，并通过计算机模拟无缺口三棱柱分析获得每种CAD/CAM树脂复合材料的断裂韧性。
三点弯曲试验获得的体外和计算机模拟载荷 - 位移曲线显著相关（p < 0.05）。CS300、AP和GT的弹性模量分别为8.0 GPa、10.0 GPa和9.0 GPa。CS300、AP和GT的计算机模拟无缺口三棱柱分析获得的断裂韧性值分别为5.057 MPa·m、4.193 MPa·m和4.880 MPa·m。三种CAD/CAM树脂复合材料之间稳定区域的长度无显著差异（p = 0.09）。
本研究建立的计算机模拟方法显示出对体外物理性能的可接受反映，将有助于在不浪费材料的情况下评估与CAD/CAM树脂复合材料寿命相关的断裂韧性。
