An in-Vitro Study Comparing The Shear Bond Strength of Four Commercially Available Bonding Materials

Abstract Bonding adhesives are orthodontically crucial to establish stability and counter masticatory forces during the treatment period. In this research, the shear bond strength (SBS) of four light-cured orthodontal bonding agents—Transbond XT, D-Tech Light Cure, Vericom U Composite, and Orthofix Light Cure—was evaluated under in vitro test conditions with primer application. Eighty non-carious fresh maxillary premolars were divided into four groups (n = 20), embedded in plaster blocks, and bonded with metal brackets. All bond failure of SBS was evaluated with an Instron Universal Testing Machine under force application. ANOVA followed by post hoc analysis revealed significant differences (p < 0.05) between adhesives. Transbond XT demonstrates the highest shear bond strength of 1063.05 MPa, which suggests that, although the bond is strong enough, it could also cause enamel damage. D-tech light cure is least apt to be used for applications requiring high bond strength with a shear strength of bond 225.53 MPa. Vericom U Composite (367.41 MPa) and Orthofix Light Cure (585.43 MPa) were shown to possess an intermediate value of shear bond strength between adhesive strength and enamel safety .Results call for the type of adhesive that should be drawn up according to clinical requirements because high-shear bond strength adhesives provide increased stability but higher risk for the damage of enamel, while the moderate shear bond strengths will ensure safer debonding. Future studies will need to be conducted on the long-term durability of SBS and the effect of debonding forces on enamel integrity.