Laboratory evaluation of shear bond strength of three different bonding systems for orthodontic brackets

Objectives: The aim of this study was to evaluate the shear bond strength of three different types of bonding systems for orthodontic brackets to tooth surface. Materials and Methods: Sixty sound premolar teeth divided randomly into three groups of 20 each. In group A, the brackets were bonded using conventional etch system. In group B, brackets were bonded using self-etch primer system, while in group C, brackets were bonded using one step adhesive system. Premolar teeth were mounted with cold acrylic resin in metallic mold and brackets were shear tested to failure using universal testing machine recorded in Newton for all specimens. Results: Group C shows significantly higher value of shear bond strength in comparison to groups A and B, while there was no significant difference between group A and B. Conclusion: Orthodontic brackets bonded to enamel surface using one-step bonding system (GC ortho connect) without primer was significantly higher than brackets bonded using conventional or self-etch systems.