Relationship among carious-dentine bond strength of adhesives, DIAGNOdent-value and dyeing-degree

Objective: The purpose of this study was to examine the relationship among tensile bond strength of three adhesives (Clearfil SE Bond; SE, Tri-S Bond; TS, Protect Bond; PB / Kuraray) to carious-dentine, DIAGNOdentTM value and dyeing-degree using Caries Detector®. Also efficiencies of DIAGNOdentTM, as a substitute for Caries Detector®, were also investigated.

Methods: A shade guide consists 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, as a result the mean acceptable dyeing-degree for caries-affected dentine were n=10. 30 extracted human canines and premolars with cervical caries were used. DIAGNOdentTM value of the carious-dentine was measured (D1-value). Then the carious-dentine was stained with Caries Detector® and verified with the shade guide (C-value), and was measured with DIAGNOdentTM (D2-value). Each adhesive was applied to the dentine, and bond strength test was performed using Portable Adhesion Tester [JDR, 78, SI, #3001,1999]: (BST-value). Dyed dentine was removed using a round steel bur, following clinical procedure. The above-mentioned procedure was continuously performed until the C-value of carious-dentine became 10 or bigger. The data were analyzed with Pearson's correlation coefficient test.

Results: Mean BST-value in MPA of C=10 dentine were (n=6); SE/25.3, TS/20.5, PB /25.1. There was no significant difference among the adhesives. Correlation coefficient was statistically significant between D2- and C-values (p<0.01). There were significant positive correlations between C- and BST-values of three adhesives. Though there was a significant negative correlation between D2- and BST-value of SE (p<0.01), there was no correlation between D2- and BST-value of TS or PB. Conclusion: BST-value became higher with increase of C-value value. Since regularity of D2-value seemed to be lower than C-value, single use of DIAGNOdentTM, as a caries-removing indicator, is not an adequate choice.