Abstract
The aim of this study was to evaluate the in vitro color agreement between nanofluorapatite ceramic discs (e.max Ceram / Ivoclar Vivadent / A2) associated with try-in pastes and those bonded with resin cements (Vitique / DMG/ try-in shade A2½ and cement shade A2½, Variolink II / Ivoclar Vivadent / try-in shade A1 and cement shade A1, and Choice 2 / Bisco / try-in shade A2 and cement shade A2), and to evaluate the shade stability of the discs bonded with resin cements. The shades of composite resin discs (Lliss / FGM / A2) and nanofluorapatite ceramic discs with try-in pastes or cements were evaluated according to the Vita Classical shade guide by a digital spectrophotometer (Micro EspectroShade, MHT) immediately after placing the try-in pastes or resin cements between composite resin discs and ceramic discs. Other evaluations were performed at 2, 5, and 6 day intervals after cementation with the resin cements. All ceramic discs that received try-in pastes presented an A2 shade. There was no statistical difference in the shade of the ceramic specimens fixed with different cements at the different intervals, as evaluated by the Friedman test (p > 0.05). Two try-in pastes presented shade compatibility with those recommended by the manufacturers. There was no similarity of shades between the ceramic discs with try-in pastes and those with the respective resin cements. Shade stability was observed in ceramic discs with resin cements within the intervals evaluated.
Highlights
The importance of shade selection for an indirect restoration is connected to the perception of chromatic hues involved in the dental structure.[1,2,3] Any mistake in shade selection and/or communication with the laboratory technician may compromise the esthetics of the rehabilitation
The digital spectrophotometer indicated that the shade of specimens with try-in pastes applied to the ceramic discs for the different commercial brands was A2 in 100% of the specimens, showing that two of the try-in pastes (VIT and CHO) presented shade compatibility (A2) with those recommended by the manufacturers
After cementation or at different intervals, there was no similarity in shade between the ceramic discs associated with try-in pastes and those cemented with the respective resin cements, insofar as the shade for resin cements was evaluated as predominantly A3 for all the resin cements
Summary
The importance of shade selection for an indirect restoration is connected to the perception of chromatic hues involved in the dental structure.[1,2,3] Any mistake in shade selection and/or communication with the laboratory technician may compromise the esthetics of the rehabilitation. This is a common failure because shade selection is based on subjective methods and on existent color scales or photographs.[4]. One method of selecting the cement shade is by using try-in pastes prior to cementation procedures.[9,10,11]
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