EFFECT OF DIFFERING RESIN LUTING SYSTEMS ON FRACTURE-RESISTANCE OF TEETH RESTORED WITH DENTIN-BONDED CROWNS

Objective. This study investigated the effect of differing bonding and luting system combinations on the fracture resistance of teeth restor ed with dentin-bonded all-ceramic crowns. Method and materials. Standa rdized preparations were carried out on five groups, each of 10 sound, unrestored, maxillary premolar teeth. Ceramic crowns were constructed , their internal surfaces were etched with hydrofluoric acid, and the crowns were placed with the following dentin bonding and resin-based l uting system combinations: group A, Mirage ABC and Mirage FLC; group B , Metabond luting material; group C, All-Bond 2 and Duo-link; group D, Scotchbond MP Plus and 3M Indirect Porcelain Bonding Kit; and group E , All-Bond 2 and 3M Indirect Porcelain Bonding Kit. The restored teeth were loaded in compression at 1.0 mm/min. Results: Mean fracture load s of 0.77 kN, 0.81 kN, 0.71 kN, 1.24 kN, and 1.03 kN were recorded for groups A, B, C, D, and E, respectively. Statistical analysis indicate d that the mean fracture resistance of the restored teeth of groups D and E was significantly greater (P < .05) than that of the other three groups. Conclusion: The fracture resistance of dentin-bonded crowns u sed in this laboratory study was dependent on the bonding and luting s ystems used.