Graf Tobias, Schweiger Josef, Güth Jan-Frederik, Sciuk Thomas, Schubert Oliver, Erdelt Kurt-Jürgen
Department of Prosthodontics, Center for Dentistry and Oral Medicine (Carolinum), Goethe-University Frankfurt am Main, 60596 Frankfurt am Main, Germany.
Department of Prosthetic Dentistry, University Hospital, LMU Munich, 80336 Munich, Germany.
Polymers (Basel). 2021 Dec 24;14(1):58. doi: 10.3390/polym14010058.
Data on the long-term behavior of computer-aided designed/computer-aided manufactured (CAD-CAM) resin-based composites are sparse. To achieve higher predictability on the mechanical behavior of these materials, the aim of the study was to establish a mathematical relationship between the material thickness of resin-based materials and their fracture load. The tested materials were Lava Ultimate (LU), Cerasmart (GC), Enamic (EN), and Telio CAD (TC). For this purpose, 60 specimens were prepared, each with five different material thicknesses between 0.4 mm and 1.6 mm (N = 60, n = 12). The fracture load of all specimens was determined using the biaxial flexural strength test (DIN EN ISO 6872). Regression curves were fitted to the results and their coefficient of determination (R) was computed. Cubic regression curves showed the best R approximation (LU R = 0.947, GC R = 0.971, VE R = 0.981, TC R = 0.971) to the fracture load values. These findings imply that the fracture load of all tested resin-based materials has a cubic relationship to material thickness. By means of a cubic equation and material-specific fracture load coefficients, the fracture load can be calculated when material thickness is given. The approach enables a better predictability for resin-based restorations for the individual patient. Hence, the methodology might be reasonably applied to other restorative materials.
关于计算机辅助设计/计算机辅助制造（CAD-CAM）的树脂基复合材料长期性能的数据较为稀少。为了提高对这些材料力学性能的预测能力，本研究的目的是建立树脂基材料的材料厚度与其断裂载荷之间的数学关系。测试材料为Lava Ultimate（LU）、Cerasmart（GC）、Enamic（EN）和Telio CAD（TC）。为此，制备了60个试样，每个试样有五种不同的材料厚度，介于0.4毫米至1.6毫米之间（N = 60，n = 12）。所有试样的断裂载荷通过双轴弯曲强度试验（DIN EN ISO 6872）测定。将回归曲线拟合到结果中，并计算其决定系数（R）。三次回归曲线对断裂载荷值的R近似最佳（LU R = 0.947，GC R = 0.971，VE R = 0.981，TC R = 0.971）。这些发现表明，所有测试的树脂基材料的断裂载荷与材料厚度呈三次关系。通过三次方程和材料特定的断裂载荷系数，当给定材料厚度时，可以计算出断裂载荷。该方法能够为个体患者的树脂基修复体提供更好的预测性。因此，该方法可能合理地应用于其他修复材料。
