KMID : 1034420170420010009
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Restorative Dentistry & Endodontics 2017 Volume.42 No. 1 p.9 ~ p.18
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Discoloration of various CAD/CAM blocks after immersion in coffee
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Lauvahutanon Sasipin
Shiozawa Maho Takahashi Hidekazu Iwasaki Naohiko Oki Meiko Finger Werner J. Arksornnukit Mansuang
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Abstract
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Objectives: This study evaluated color differences (¥ÄEs) and translucency parameter changes (¥ÄTPs) of various computer-aided design/computer-aided manufacturing (CAD/CAM) blocks after immersion in coffee.
Materials and Methods: Eight CAD/CAM blocks and four restorative composite resins were evaluated. The CIE L*a*b* values of 2.0 mm thick disk-shaped specimens were measured using the spectrophotometer on white and black backgrounds (n = 6). The ¥ÄEs and ¥ÄTPs of one day, one week, and one month immersion in coffee or water were calculated. The values of each material were analyzed by two-way ANOVA and Tukey's multiple comparisons (¥á = 0.05). The ¥ÄEs after prophylaxis paste polishing of 1 month coffee immersion specimens, water sorption and solubility were also evaluated.
Results: After one month in coffee, ¥ÄEs of CAD/CAM composite resin blocks and restorative composites ranged from 1.6 to 3.7 and from 2.1 to 7.9, respectively, and ¥ÄTPs decreased. The ANOVA of ¥ÄEs and ¥ÄTPs revealed significant differences in two main factors, immersion periods and media, and their interaction except for ¥ÄEs of TEL (Telio CAD, Ivoclar Vivadent). The ¥ÄEs significantly decreased after prophylaxis polishing except GRA (Gradia Block, GC). There was no significant correlation between ¥ÄEs and water sorption or solubility in water.
Conclusions: The ¥ÄEs of CAD/CAM blocks after immersion in coffee varied among products and were comparable to those of restorative composite resins. The discoloration of CAD/CAM composite resin blocks could be effectively removed with prophylaxis paste polishing, while that of some restorative composites could not be removed.
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KEYWORD
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CAD/CAM block, Discoloration, Translucency parameter, Water solubility, Water sorption
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