Department of Biomaterials Science, Osaka University Graduate School of Dentistry.
Kuraray Noritake Dental Inc.
Dent Mater J. 2021 Sep 30;40(5):1235-1242. doi: 10.4012/dmj.2020-456. Epub 2021 Jun 1.
This study aimed to propose an evaluation method for testing the mechanical strength of film-formed self-adhesive resin cements (SARCs) while reflecting cement layer thickness. Three commercially available dual-cure type SARCs were used for tensile and shear tests using specimens with varying thicknesses (0.05, 0.2, and 0.4 mm). There were no significant differences in tensile strengths among the various specimen thicknesses. In the shear test, there was a significant decrease in the strength with a reduction in specimen thickness. Stress distribution and fracture patterns were analyzed using in silico nonlinear dynamic finite element analysis. Finite element analysis demonstrated that stress distribution on the specimen surface was homogeneous even with different thicknesses in the tensile test, whereas it was inhomogeneous and induced different fracture patterns on the 0.05-mm-thick specimen in the shear test. These results suggest that the tensile test is useful for testing the mechanical strength of film-formed SARCs.
本研究旨在提出一种评估方法，用于测试成膜自粘结树脂水门汀（SARCs）的机械强度，同时反映水泥层厚度。使用三种市售的双重固化型 SARCs 对具有不同厚度（0.05、0.2 和 0.4 mm）的试件进行拉伸和剪切测试。在不同试件厚度下，拉伸强度没有显著差异。在剪切试验中，随着试件厚度的减小，强度显著降低。使用非线性动态有限元分析对其应力分布和断裂模式进行了分析。有限元分析表明，在拉伸试验中，即使试件厚度不同，试件表面的应力分布也是均匀的，而在剪切试验中，0.05mm 厚的试件的应力分布不均匀，并导致不同的断裂模式。这些结果表明，拉伸试验可用于测试成膜 SARCs 的机械强度。
