不同牙体预备车针所致玷污层对自粘接型树脂水门汀粘结强度的影响

Abstract

Abstract: Objective To evaluate the effects of smear layer characteristics of dentin surface on bond strength of self-adhesive resin cement. Methods The study was conducted with 36 fresh, extracted non-carious, human third molars with the dentin surface exposed. Included samples were randomly divided into two groups, which were ground roughly with standard-grain diamond burs (blue label; group A), and ground roughly with standard-grain + fine-grain diamond burs (yellow label) combined with further fine grinding and polishing (group B), respectively. The treated teeth were bonded with three self-adhesive composite resin cements, including Clearfil SA Cement (SC), MultilinkSpeed (MS) and RelyX U200 (RX), to make micro-tensile samples. The samples were stored in water for 24h and then the micro-tensile bond strength was tested. Two-factor ANOVA was used to analyze dentin surface treatment and resin cement types, and to determine the interaction between the two factors. Results Scanning electron microscopy showed that the dentin surface of group A was rough, the smear layer was thick and the orifice of dentinal tubules was not completely blocked. In group B, the roughness of dentin surface decreased, dentinal tubule orifice was completely blocked and smear layer became thinner. Statistical results showed that different dentin surface treatment methods and types of self-adhesive resin cement had significant effects on bond strength (P<0.05), but there was no significant interaction between them. The adhesive strengths of SC, RX and MS in group B were all lower than those of group A. There was no significant difference in the adhesive strength of the three kinds of resin cement after grinding the dentin surface with blue label bur. After being polished with yellow label bur, the adhesive strength of MS was significantly lower than that of SC and RX, but there was no significant difference between SC and RX. Furthermore, the fracture mode counting indicated that the bone fracture mode of the three resin cements was mainly interfacial fracture. Conclusion Smear layer characteristics of dentin surface and types of self-adhesive resin cement can both have certain impacts on the bond strength.

Key words: self-adhesive resin cement, dentin, smear layer, micro-tensile strength

CLC Number:

R781.1

References

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Effects of smear layer by different burs on the bonding strength of dentin and self-adhesive resin cement

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