Assessment of tensile bond strength of two ceramic restoration materials comparing two immediate dentin sealing protocols versus delayed dentin sealing -An in vitro study-

Abstract

This study was designed to evaluate the influence of immediate dentin sealing and delayed dentin sealing on the tensile bond strength and interfacial quality of two different indirect ceramic restoration materials with dentin. Sixty recently extracted human molars were cleaned and stored in thymol solution. Teeth were randomly divided into two groups according to the ceramic restoration material, and then each of the two groups were subdivided into two subgroups according to dentin sealing protocol used (IDS, and DDS). IDS subgroup was further subdivided according to the sealed dentin surface refreshment modalities after provisionalization. A surveyor was used to ensure upright position of teeth in molds filled with self-cure acrylic resin. The occlusal surface of each tooth was ground flat to expose the dentin surface using low speed diamond saw. Sealing of occlusal surface using scotchbond universal adhesive was done either immediately after dentin exposure (IDS), or delayed after placement and removal of temporary filling (DDS) After removal of temporary filling the dentin surface was cleaned either in IDS or DDS groups, In DDs group dentin surface was cleaned by air abrasion (cojet) nevertheless For IDS group, the sealed dentin surface was cleaned either by air abrasion (cojet) or by pumice system Ceramic discs (6 x 3 mm) were fabricated from e.max and