SHEAR BOND STRENGTH OF REXILLIUM-III TO ENAMEL USING RESIN COMPOSITE CEMENTS

This study evaluated the shear bond strength of Rexillium III (Jeneric Pentron, Wallingford, CT) to enamel using various resin composite lut ing systems. Cast alloy cylinders (3.9 mm x 6.0 mm) were bonded with e ach cement to human molar buccal enamel surfaces (n = 8). The enamel w as etched using a 35% phosphoric acid solution for 30 seconds. Bonded specimens were stored in distilled water for 7 days at 37 degrees C an d thermocycled (1,500 cycles) in 5 degrees C and 55 degrees C water ba ths (1-minute dwell time). Specimens were randomly tested in shear usi ng a crosshead speed of 0.5 mm per minute. Use of a one-way analysis o f variance (P < .001) and the Ryan-Einot-Gabriel-Welsh multiple range test showed significant differences between several of the resin cemen ts. Panavia exhibited a significantly higher shear bond strength than any of the other cements tested (P < .05).