The effects of whitening toothpastes on color change of resi
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.

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 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.

- Color differences occurring on all resin-based CAD/CAM blocks immersed in coffee for 14 days exceeded the 50%:50% perceptibility threshold (PT).

- There was no statistically 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.

Overall, it has been verified that the discoloration on resin-based CAD/CAM blocks exhibiting color differences above the PT after coffee immersion can be reduced by utilizing toothpastes containing whiteners.

Journal of Esthetic and Restorative Dentistry