Abstract
Hybrid ceramics “Estenia” has appropriate mechanical strength and natural color appearance for posterior prosthesis. The purpose of this study was to evaluate the fitness of posterior jacket crowns fabricated by Estenia under different experimental conditions.Two types of epoxy abutments, normal and wide shoulder, of upper first molar were used in this study. In addition, five different conditions of die-spacer layering were used. The crowns and abutments wereembedded and sectioned buccolingually to measure the internal and marginal gaps between the crown and abutment.The marginal gaps ranged from 18.4 to 66.6 pmfor normal abutment and from 15.8 to 59.0 um for wide shoulder abutment. When the internal and marginal gaps of the normal abutments were compared with those ofwide shoulder abutments, no significant difference was found among the two typesof abutments.Under the conditions of this study and from the results, the following conclusions were reached:1. Estenia demonstrated clinical acceptability in fitness of posterior crowns.2. Marginal and internal fitness was not influenced by the types of abutment.3. Die-spacer application to internal line-angle of shoulder preparation was an effective method for decreasing marginaldiscrepancy.
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