Mutual Relation Among Bond Strength of Resin Adhesive Systems to Carious Dentine, DIAGNOdent™ Value and Dyeing Degree with Caries Detector®

Abstract

The purpose of this study was to examine the relationship among the tensile bond strength of three adhesive systems (Clearfil Mega Bond (Cleartil SE Bond), Tri-S Bond, ABF/Kuraray) to carious dentine, DIAGNOdent™ value and dyeing-degree with Caries Detector®. In addition, efficiencies of DIAGNOdent™ were investigated as a substitute for Caries Detector®. A shade guide consisting of 15 continuous diluted solutions of Caries Detector®, 1/2ⁿ (n=1-15) concentration was prepared. Preliminary survey of clinical acceptable caries affected-dentine for the adhesive restoration was performed by 25 clinicians, and as a result, the mean acceptable dyeing-degree for caries affected-dentine were C=10. Thirty extracted human canines and premolars with cervical caries were used. The DIAGNOdent™ value (D₁-value) of the carious dentine was measured. Then the carious dentine (cariesinfected dentine) was stained with Caries Detector® (C-value) and measured with DIAGNOdent™ (D₂-value). Each adhesive system was applied to the dentine, according to the manufacturer's instruction, and tensile bond strength tests were performed using a Portable Adhesion Tester (BST value). Dyed caries-infected dentine was removed using a round steel bur, following standard clinical procedure. The above-mentioned procedure was continuously performed until the C-value of the carious dentine became 10 or greater. The data were analyzed using the Pearson's correlation coefficient test. The results are as follows. 1. Though there was a significant difference between D₁ and D₂-values, there seems to be no difference in use as an indicator for removing caries dentine. 2. The correlation coefficient was statistically significant between the D₂-value and C-value (p<0.01). However, the correlation coefficient was -0.238. 3. There were significant positive correlations between the C-value and BST values of the three adhesives. 4. Though there was a significant negative correlation between the D₂-value and BST value of CMB (p<0.01), there was no correlation between the D₂-value and BST value of TRS or ABF. 5. The mean BST values of the C=10 dentine were: CMB 25.3 MPa, TRS 20.5 MPa, ABF 25.1 MPa, respectively. There was no significant difference between the adhesives. 6. Compared to the C-value, the regularity of the D₂-value seemed to be low. So single use of DIAGNOdent™, as a caries-removing indicator, is not an adequate choice.