Bond Strength and Degree of Conversion of Self-Adhesive Resin Cements

Sammanfattning: Abstract  Aim: To determine the shear bond strength of two commercially available self-adhesive resin cements on four different materials and to analyse the degree of conversion (DC) of those resin cements.  Materials and Methods: A total of 45 embedded specimens made of four different materials were prepared for the notched-edge shear bond strength test. Ten specimens each of resin composite, glass-ionomer, zirconia and 15 of human dentine. Pillars of two different self-adhesive resin cements were luted onto these specimens. Five of the dentine specimens were treated with Katana Cleaner before being luted with Panavia. A single sample from each self-adhesive resin cement was used to determine the DC using ATR-FTIR Spectroscopy. The samples were measured uncured, right after being light cured and 10 min thereafter. Results: The highest shear bond strength values were seen for RelyX, irrespective of the material tested. This difference was statistically significant. No statistically significant difference was seen between the dentine specimens pre-treated with Katana Cleaner and luted with Panavia, compared to no pre-treatment. No statistically significant differences were found regarding DC between Panavia and RelyX.  Conclusion: The bond between the dental materials and the tooth structure is extremely important for the longevity of the restoration. The bond strength of RelyX for all materials tested were 2.1 to 37.5 times higher than that for Panavia and the differences were statistically significant. Panavia had virtually no bonding to the dentine in this study which might be due to the treatment of the dentine. The differences regarding the degree of conversion between the two resin cements were not statistically significant. However, the DC 10 min after curing was 1.3 times higher than directly after curing for both resins.