Ayub khan, A. Gopinath , Sameer, Neelakantha, VenkatNaidu

ABSTRACT

Introduction: Primer usually is an unfilled resin whose primary function is to improve the effectiveness of the final bond. Secondarily,they also claimed to protect enamel from the consequent demineralization by the acid etching and to reduce marginal leakage. The use of primer adds a step in the bonding procedure which increased chair time, therisk of moisture contamination and an increased procedural cost. Material and method : Eighty extracted human premolars ,were collected and divided into two groups that are conventional adhesive system with and without primer ,the teeth were cleaned and dried and stored in aqueous thymol solution, later acrylic blocks where made and the teeth where bonded with brackets with and without primer and then the shear bond strength (SBS) was done by using universal testing machine (UTM). Results:The shear bond strength (SBS) values were obtained in MPa for the 2 sample groups: group I (with primer), group ii(without primer) and the bond strength value was 10.22± 2.4 MPa and 9.11 ± 1.596 MPa respectively. Conclusion: A conventional adhesive system with and without primer bond showed shear bond strength (SBS) in the range satisfactory for clinical usage