An Evaluation and Comparison of Shear Bond Strength of Two Adhesive Systems to Enamel and Dentin: An In Vitro Study

To evaluate and compare shear bond strength of the two generations (6th generation- Clearfil SE Bond [Kuraray Co.] Osaka, Japan), (7th generation - Clearfil S3 Bond [Kuraray Co.] Osaka, Japan) of adhesive systems to non-carious surfaces of enamel and dentin in both maxillary and mandibular anterior teeth. Total 60 teeth were selected for the study. They were assigned to Group A and B of 30 teeth each. Groups A and B were then randomly divided into two subgroups of 15 teeth each. The teeth were embedded in self-curing acrylic resin block up to the cervical level, with a labial surface positioned for surface treatment. Bonding agents were used according to manufacturers' direction. All specimens were bonded with composite resin (Z-350 XT hybrid composite resin system. A 1 shade 3M ESPE) and subjected to shear bond strength testing, using Instron universal testing machine. Shear bond strength of Group A1 is 26.82 MPa, for Group A2 - 24.68 MPa and for Group A3 - 20.71 MPa. Shear bond strength of Group B1 is 27.09 MPa, for Group AB - 26.42 MPa and for Group B3 - 22.46 MPa. Statistical analysis was done by applying Student's unpaired t-test, one-way ANOVA analysis with post-test (Tukey-Kramer multiple comparison tests), and Fisher's exact t-test. Within the limitations of this in vitro study it can be concluded that Clearfil SE Bond resulted in the higher mean shear bond strength for dentin and for enamel compared with other group.