At the interface between an adhesive composite resin and dentin after caries removal and acid etching with 37% phosphoric acid gel for 60 seconds, the hybrid layer between the adhesive resin and surface-demineralized dentin was found to be wider in the area of empty tubules (mean=5.53μm) compared with that of the occluded tubules (mean=2.92μm), and was found to be the thinnest at the lateral walls of the cavity where the dentinal tubules run parallel to the cavity surface.
At the interface between an adhesive composite resin and dentinal walls of cervical erosion/abrasion lesions etched with 37% phosphoric acid gel for 60 seconds, almost all dentinal tubules were occluded with rod like structural depositions which remained undissolved even after acid conditioning. The hybrid layer between the adhesive resin and surface-demineralized dentin was found to be 0.3 to 3μm, much thinner than that of either normal dentin or caries affected dentin. The hybrid layer was thinnest at the occlusal walls of the cavity where the dentinal tubules run parallel to the cavity surface. Thus, the bond strength of adhesive resin to carious dentin and sclerotic dentin might be different from that to intact normal dentin.
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