The objective of this study was to evaluate the influence of adhesive layer thickness on wear damage of the bonded interface between enamel and composite inlays using self-adhesive resin cement. Sixty bonded interface samples consisting of four different adhesive layer thicknesses (10 ± 10, 50 ± 10, 100 ± 10 and 150 ± 10 μm) were prepared from resin composite (Tetric N Ceram Bulk Fill; Ivoclar Vivadent AG), self-adhesive resin cement (RelyX U200; 3M ESPE) and tooth enamel. Ball-on-flat sliding wear tests (20 N, 1 Hz, 5 × 10⁴ cycles) were performed on four groups of samples (n = 15). The wear depth and wear track morphology of each sample after 5 × 10², 5 × 10³, and 5 × 10⁴ cycles were recorded by white light interferometry and scanning electron microscopy, respectively. Optical microscopy was also used to evaluate cracks and their propagation in the samples. Stress distribution of the interface with four different adhesive layer thickness was analyzed by Finite Element Analysis. All the four groups had similar wear evolution on the bonded interface and the adjacent enamel showed characteristic brittle fracture and microcracks. But the extent of wear damage varied among different groups. The 50 ± 10 μm group owned the slightest damage after 5 × 10², 5 × 10³, and 5 × 10⁴ cycles. Stress concentration always happened on the enamel near the interface and thinner adhesive layer owned more stress concentration. In conclusion, for self-adhesive resin cement, 50 ± 10 μm was the best thickness of adhesive layer for the enamel–composite inlay interface from the aspect of tribology.

这项研究的目的是评估粘合剂层厚度对使用自粘树脂胶粘剂的牙釉质和复合嵌体之间的粘结界面的磨损损伤的影响。用树脂复合材料（Tetric N Ceram Bulk Fill； Ivoclar Vivadent AG），自粘树脂制备了60种由四种不同的粘合剂层厚度（10±10、50±10、100±10和150±10μm）组成的粘合界面样品水泥（RelyX U200； 3M ESPE）和牙釉质。对四组样品（n  = 15）进行了扁球滑动磨损测试（20 N，1 Hz，5×10 ⁴个循环）。各样品的磨损深度和磨损痕迹形态5×10之后²，5×10 ³和5×10 ⁴通过白光干涉法和扫描电子显微镜分别记录周期。光学显微镜还用于评估裂纹及其在样品中的传播。通过有限元分析来分析具有四种不同粘合剂层厚度的界面的应力分布。这四组在粘结界面上都有相似的磨损演变，相邻的牙釉质表现出特征性的脆性断裂和微裂纹。但是磨损损坏的程度在不同组之间有所不同。在50±10μm的组拥有丝毫损坏5×10之后²，5×10 ³和5×10 ⁴周期。应力集中总是发生在界面附近的瓷釉上，而较薄的粘合剂层则具有更大的应力集中。总之，就摩擦学而言，对于自粘树脂胶粘剂而言，对于搪瓷-复合嵌体界面而言，50±10μm是最佳的粘合剂层厚度。