Abstract:

Objective The purposes of this study was to investigate the effects of luting agents on the resultant color of IPS e.max all-ceramic veneer restorations, and to evaluate the similarity of try-in pastes and the corresponding luting agents on the final color. Methods Disc-shaped ceramic specimens were fabricated and seated on four shades of resin specimens to mimic the complex of ceramic veneer laying on tooth substrates. Try-in pastes and luting agents（Shades of TR, B0.5, A1, A3, WO） were applied into the inter-layer of ceramic and resin specimens, respectively. The color of the combinations was measured using a spectrophotometer and subsequently converted to CIE L*a*b* values. Color changes after luting agent applied, and between try-in paste and corresponding luting agent were calculated and registered as ΔEresin and ΔEpaste-resin. Results ΔEresin value of A2, A3 backgrounds was more than 1.0. ΔEresin value of A4, A5 backgrounds was less than 1.0. The ΔEpaste-resin value of A3 backgrounds was more than 1.0, whereas, A2 was less than 1.0（except for shade WO）. The ΔEpaste-resin value of shade WO was significantly different from other shades of luting agents. Conclusion The color of ceramic veneer restorations were affected by luting agents with A2, and A3 background colors. The agreement of the try-in paste and the corresponding luting agent was excellent for A2 background（except for WO）

Key words: ceramic veneer, color difference, try-in paste, luting agent