EVALUATION OF ACIDIC PRIMERS IN MICROLEAKAGE OF CLASS-5 COMPOSITE RESIN RESTORATIONS

The purpose of this in vitro study was to evaluate the marginal seal o f two adhesive systems on class 5 composite resin restorations. Two ad hesive systems that use acidic primers were used in this study: Clearf il Liner Bond 2 and Denthesive II, Scotchbond Multi-Purpose was used a s a control. Class 5 cavity preparations were made at the CEJ (half of the preparation was in enamel and half in dentin/cementum) of 60 extr acted human molars. Both systems were used with and without etching. T he control group was used with etching only. Composite resin restorati ons were placed, light cured for 40 seconds, and polished. All specime ns mere thermocycled 500 times. The specimens were immersed in erythro sin B, tetra-iodo-fluorescent 2% solution, then sectioned to obtain 60 0 mm-thick sections. These were examined under X13.2 magnification, an d the degree of dye penetration was measured in microns. A chi-square test demonstrated no significant differences in microleakage among gro ups for either dentin (P = 0.54) or enamel (P = 0.35).