EFFECT OF 2 DENTINAL DESENSITIZING AGENTS ON RETENTION OF COMPLETE CAST COPING USING 4 CEMENTS

The cementation of artificial crowns is commonly accompanied by sensit ivity, so the clinical application of desensitizing agents has become prevalent, This study investigated the effects of Imperva bonding agen t and All-Bond desensitizing agent on the retention of artificial crow ns. The cements selected for this study were: zinc phosphate, polycarb oxylate, glass ionomer, and resin luting agents, Extracted, intact, hu man molars were mounted in autopolymerizing acrylic resin and prepared for complete cast copings. Thirty-two teeth were treated with All-Bon d desensitizing agent, 32 teeth with Imperva bonding agent, and 32 rem ained untreated, Castings were cemented and tested on an Instron testi ng machine. The results demonstrated a significant reduction in retent ion when All-Bond desensitizing agent was used with polycarboxylate ce ment and some reduction with zinc phosphate cement. Imperva bonding ag ent demonstrated less retention with glass ionomer cement.