Evaluation of resin-dentin interface on caries treatment

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Resin bond strengths to caries-affected dentin are of more clinical relevance than those made to normal dentin. The microtensile bond testing technique permits measurement of bond strength to both normal and caries affected dentin. Moreover, using this technique, it is possible to evaluate bonding durability to dentin floor of in vivo cavities. The bond strengths of resin composites to caries-affected dentin were lower than those of normal dentin, and the in vivo and in vitro resin-dentin interfaces gradually degraded over time.In order to evaluate the physiological remineralization of dentin, nanohardness and elemental distributions of artificial demineralized dentin beneath glass ionomer cements were measured after 3 or 360 days in vivo using nanoindentation tester and EPMA. The nanohardness of 3 days sample were lower than that of 360 days sample. Although Ca density was sparse within demineralized dentin, a high Mg density within this lesion was detested at 360 days.