Buket KARALAR, Nurcan ÖZAKAR, Yusuf Ziya BAYINDIR
Meandros Medical and Dental Journal - 2026;27(1):41-48
Objective: This study investigated the shear bond strength of universal adhesive systems applied to dentin at different air-blowing pressures. Materials and Methods: Flat dentin surfaces were prepared from 120 freshly extracted, caries-free human molar teeth. Three universal adhesives were used: G-Premio Bond, Clearfil S3 Bond Universal, and Scotchbond Universal. The samples were randomly divided into groups according to the adhesives and the air-blowing pressures (0.14 MPa, 0.28 MPa and 0.41 MPa) (n=10). In each adhesive system, an unpressurized group was designated as the control group (n = 10). The shear bond strength values were measured using a universal testing device (Instron 3344, Instron Corp, Wilmington, USA). The data were analyzed using ANOVA and Tukey's post hoc test at a significance level of 0.05. Results: Both the adhesive system (p<0.001) and air-blowing pressure (p<0.001) significantly affected shear bond strength, with a significant interaction between the two factors (p=0.002). The highest mean value was obtained at a pressure of 0.41 MPa in the SU group (17.40+/-6.01), 0.14 MPa in the CU group (17.52+/-4.46), and 0.28 MPa in the GP group (10.05+/-3.89). Conclusion: The influence of air-blowing pressure on bond strength depended on the adhesive, and each material showed a different optimal air-blowing pressure for achieving the best bonding performance.
