J Adhes Dent. 2021 Jul 23;23(4):297-308. doi: 10.3290/j.jad.b1649941.
Different kinds of interactions between the restorative material and mineralized dental tissues result in secondary caries around dental composites. Of these, the mechanical interactions have to be carefully investigated. Due to the elastic mismatch between dental tissues and the composite restoration, complex stresses and strains develop at their interface. This complex mechanical environment disturbs the demineralization-remineralization equilibrium of dental hard tissues. The fluid flow both over and within enamel and dentin, associated with their complex ultrastructure and mechanical behavior, is a key factor. It is known that external mechanical loading can indirectly promote the dissolution of enamel and dentin through a pumping action of cariogenic fluids in and out of microgaps at the interface between mineralized tissues and composite. Mechanical loading can also directly influence the physicochemical behavior of dental hard tissues by inducing complex strain and stress fields on the crystal scale. It is important to consider both the direct and indirect paths by which mechanical loading can influence the apatite dissolution kinetics. Therefore, a systematic approach should be used to investigate the mechanism of secondary caries formation considering the tooth-composite interface as a unique complex in which each element has an influence on the other.
不同类型的修复材料与矿化牙体组织之间的相互作用会导致牙体复合树脂周围发生继发龋。其中，必须仔细研究机械相互作用。由于牙体组织与复合修复体之间的弹性失配，它们的界面会产生复杂的应力和应变。这种复杂的机械环境会破坏牙体硬组织的脱矿-再矿化平衡。牙釉质和牙本质表面及其内部的流体流动，以及它们复杂的超微结构和力学行为，是一个关键因素。已知外部机械负载可以通过在矿化组织和复合层之间的界面处的微间隙中进出的致龋流体的泵送作用，间接地促进牙釉质和牙本质的溶解。机械负载还可以通过在晶体尺度上诱导复杂的应变和应力场，直接影响牙体硬组织的物理化学行为。考虑到机械负载影响磷灰石溶解动力学的直接和间接途径，重要的是要考虑将牙-复合层界面视为一个独特的复杂系统，其中每个元素都会对其他元素产生影响。
