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KMID : 1023820220140010056
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The Journal of Advanced Prosthodontics
2022 Volume.14 No. 1 p.56 ~ p.62
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Color stability of fully- and pre-crystalized chair-side CAD-CAM lithium disilicate restorations after required and additional sintering processes
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Jurado Carlos Alberto
El-Gendy Tamer
Hyer Jared
Tsujimoto Akimasa
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Abstract
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PURPOSE: The aim of this study was to investigate shade changes in fully- and pre-crystalized CAD-CAM lithium disilicate crowns after the required and additional firing processes.
MATERIALS AND METHODS: One hundred and five crowns of shade A1 with high translucency were milled out of CAD-CAM lithium disilicate blocks and categorized as follows (n = 15): (1) restorations fabricated from Straumann n!ce with no additional sintering process; (2) restorations fabricated from Straumann n!ce with one additional sintering process; (3) restorations fabricated from Straumann n!ce with two additional sintering processes; (4) restorations fabricated from Amber Mill with one sintering process; (5) restorations fabricated from Amber Mill with two sintering processes; (6) restorations fabricated from IPS e.max CAD with one sintering process; (7) restorations fabricated from IPS e.max CAD with two sintering processes. All restorations were evaluated with a color imaging spectrophotometer.
RESULTS: All restorations presented some color alteration from the original shade both after a single and after two firing processes.
CONCLUSION: The required and additional sintering processes for restorations fabricated with chairside CAD-CAM lithium disilicate blocks cause an alteration of the original shade selected. Shade A1 high translucency restorations tend to change to a more yellowish B1 shade after a sintering process.
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KEYWORD
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Prosthodontics, Ceramics, Crowns, Dentistry, Esthetics
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