MICROLEAKAGE THROUGH DENTIN AFTER CROWN CEMENTATION

This study investigated the relationship between type of luting cement for artificial crowns and microleakage through dentinal tubules. Stan dardized preparations were made on intact human premolars, and crowns were made in a base metal alloy using conventional techniques. The cas tings were randomly assigned to the following luting agent groups: zin c phosphate (ZP), polycarboxylate (PC), glass ionomer (GI), phosphate ester composite resin (GMA/PE), and a composite resin with a NPG-GMA d entin bonding agent (GMA/NPG). Then they were cemented in a standardiz ed manner. The specimens were artificially aged, stained, sectioned, a nd microleakage occurred through dentinal tubules toward the pulp meas ured. The rank in order from least to most (best to worst) leakage was GMA/NPG, GI, GMA/PE, PC, and ZP, Material GMA/NPG recorded significan tly less leakage than all other materials. Therefore, the results of t his study suggest that material GMA/NPG may reduce pulpal sensitivity and pathosis.