Investigation the effects of whitening toothpastes on color change of resin‐based CAD / CAM blocks

Introduction Some colorant foods and beverages cause undesired discoloration on dental restorations. The aim of this study was to investigate the effect of whitening kinds of toothpaste with different active ingredients on the color change of resin-based CAD/CAM blocks. Material and methods In the study, resin-based CAD/CAM block samples sized 1.5 × 7 × 12 mm, were prepared. Then, to simulate the time-dependent color change, the samples were immersed in coffee (Nescafe Classic, Nestle) for 14 days. After the color change values of the samples colored in coffee were measured by spectrophotometer, the samples were brushed with different types of whitening toothpastes for 4 minutes. Statistical analysis of the color change (ΔE00 ) was performed using the one-way analysis of variance (ANOVA). Results Color differences occurring on all resin-based CAD/CAM blocks immersed in coffee for 14 days exceeded the 50%:50% perceptibility threshold (PT) (ΔE00 :0.8). There was no statistical significant difference between the whitening toothpastes containing activated charcoal, hydrogen peroxide (HP), blue covarine pigment, and microparticles in color improvement on resin-based CAD/CAM blocks (P > .05). Conclusion It has been verified that the discoloration on resin-based CAD/CAM blocks exhibiting color difference above the PT after coffee immersion can be reduced by utilizing toothpastes containing whiteners. Clinical significance Color changes that occur over time in resin-based CAD/CAM blocks can be a clinical problem. These color changes in the materials can be reduced below the PT level using whitening toothpastes.