Monday, September 21, 2015

Color Stability of CAD/CAM Fabricated Inlays after Accelerated Artificial Aging

Karaokutan, I., Yilmaz Savas, T., Aykent, F. and Ozdere, E. (2015), Color Stability of CAD/CAM Fabricated Inlays after Accelerated Artificial Aging. Journal of Prosthodontics. doi: 10.1111/jopr.12353

 

Abstract

Purpose

To investigate the influence of accelerated artificial aging on the color stability of three different inlay restorations produced with a CAD/CAM system.

Materials and Methods

Thirty non-carious human mandibular molar teeth were used. The teeth were embedded in autopolymerizing acrylic resin blocks. Standard Class I inlay cavities were prepared, and the teeth were randomly divided into three groups (n = 10) to fabricate inlay restorations: (1) a feldspathic-ceramic group, (2) a resin nano-ceramic group, and (3) a leucite glass-ceramic group. Optical impressions were made with CEREC software, and the restorations were designed and then milled. The inlays were adhesively cemented with a dual-polymerizing resin cement and left in distilled water at room temperature for 1 week. Color measurements were performed with a spectrophotometer before and after accelerated aging in a weathering machine with a total energy of 150 kJ/m2. Changes in color (∆E, ∆L, ∆a, ∆b, ∆C) were determined using the CIE L*a*b* system. The results were assessed using a one-way ANOVA and Tukey's HSD test (p = 0.05).

Results

The color changes of the materials ranged from 2.1 to 9.29. The highest color change was seen in the resin nano-ceramic material. This change was not clinically acceptable (∆E > 5.5). No significant differences were found in the ∆L and ∆a values of the test groups.

Conclusions

Color changes were observed in each evaluated material after accelerated aging. All CAD/CAM inlays became darker in appearance, more saturated, a little reddish, and more yellow.

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