Department of Biomaterials Science and Turku Clinical Biomaterials Center-TCBC, Institute of Dentistry, University of Turku.
Department of Crown and Bridge, School of Life Dentistry at Tokyo, The Nippon Dental University.
Dent Mater J. 2019 Dec 1;38(6):1002-1011. doi: 10.4012/dmj.2018-304. Epub 2019 Oct 30.
This study evaluated the effect of material type, thickness and composite-composite interfacial adhesion on the load-bearing capacity of the bilayered composite structures. Bilayered cylindrical specimens (diameter=7 mm, height=5 mm) were prepared having three surface-layer thicknesses (1, 1.5, 2 mm) of Gænial Posterior to overlay base-composites [everX Posterior or Smart Dentin Replacement (SDR)]. Adhesion between surface and base composite-layers was based on an O-inhibited layer for optimal-adhesion (OA) or polished surface for deteriorated-adhesion (DA). Specimens (n=10) were light-cured before static-loading with a steel-ball until fracture. Stress distribution in the same designs of mechanical test was calculated by finite element analysis (FEA). Static-loading demonstrated that in both base materials, thickness and adhesion had an effect on load-bearing capacity (p<0.05). FEA showed less strain distribution for everX groups than SDR.With OA, everX Posterior demonstrated higher load-bearing capacity even with thin surface-composite layer. DA made the load-bearing capacity more sensitive to surface-layer thickness.
本研究评估了材料类型、厚度以及复合-复合界面黏附性对双层复合结构承载能力的影响。制备了具有三种表层厚度（1、1.5、2 毫米）的双层圆柱形试件（直径=7 毫米，高度=5 毫米），表层为 Gænial Posterior，覆盖基底复合材料[everX Posterior 或 Smart Dentin Replacement (SDR)]。表面和基底复合材料层之间的黏附性基于抑制 O 层以实现最佳黏附（OA）或抛光表面以实现恶化黏附（DA）。在静态加载至断裂之前，用光对试件（n=10）进行固化。通过有限元分析（FEA）计算相同机械测试设计中的应力分布。静态加载表明，在两种基底材料中，厚度和黏附性对承载能力都有影响（p<0.05）。FEA 显示，对于 everX 组，应变分布小于 SDR。使用 OA，即使表层复合材料层较薄，everX Posterior 也表现出更高的承载能力。DA 使承载能力对表层厚度更加敏感。
