Objective: To test the claim of the manufacturers about the necessity of combining the orthodontic primers and adhesive pastes from the same brand in order not to compromise the bond strength to enamel.
Materials and methods: Eighty human premolar teeth with intact buccal surfaces were randomly divided into four groups with twenty teeth per group. Regarding Group I and Group IV, the same brand of primers and adhesive pastes was used from 3M™ Transbond™ XT and Ormco™ Grengloo™ bonding systems, respectively. Conversely, Groups II and III involved using non-corresponding primers and adhesive pastes from those brands. The miniMaster series® brackets from the American Orthodontics™ company were used for bonding to enamel surfaces. After debonding with a universal testing machine, the Shear Bond Strength (SBS) values were obtained and compared. Then, the adhesive remnant index (ARI) was scored using qualitative visual scoring.
Results: The mean SBS values for Groups I, II, III, and IV were 11.26, 8.07, 9.98, and 10.04 MPa, respectively. The highest mean was observed in Group I, while the lowest was in Group II. There were statistically insignificant differences in SBS, observers' ratings of ARI, failure modes, and distribution of ARI scores.
Conclusion: Despite using non-corresponding orthodontic primers and adhesives from different manufacturers during bonding to enamel surfaces, good bonding strength values can be obtained.
Keywords: Adhesive, bond, brackets, primer, shear, score.