Evaluation of Stain Susceptibility of Different CAD/CAM Blocks After Immersion in Coffee

Abstract

Aim: Color stability is gaining more importance today due to majority of patients are seeking color matching restorations. However, there is still lack of information on staining and changes in translucency of recent CAD/CAM block materials. The goal of the current study was to evaluate the discoloration susceptibility, translucency change, water solubility, and water sorption of different CAD/CAM materials after one-month of immersion in coffee. Material and Methods: Four CAD/CAM block materials and one conventional composite resin were examined. The CIELab values of CAD/CAM materials were determined using a clinical spectrophotometer on black and white backgrounds. The color changes and translucency differences were calculated after immersion in coffee or distilled water for one month (n=6). Water solubility and sorption were also determined according to the ISO 4049:2009 (n=6). The data were calculated by 2-way ANOVA and Tukey’s pair-wise comparisons (α=0.05). Results: Color changes of the CAD/CAM materials tested ranged from 1.5 to 7.3, and translucency reduced. The highest color change was observed in nanocomposite resin (7.3), whereas the lowest color change was observed in feldspathic porcelain (1.5) after storing in coffee for a month. There was no significant difference among the polymer-based CAD/CAM materials. No correlation was determined between color changes and water sorption/solubility. Conclusion: All materials except feldspar ceramic showed a discoloration exceeding the clinically acceptable threshold level (2.7) after being stored in coffee for one month. The highest color change was observed in nanocomposite resin material.