[The color analysis of nanocomposite material before and after exposure to whitening toothpastes using a portable spectrophotometer].

Purpose: To determine the effect of whitening toothpastes on the color of a nanocomposite material using a spectrophotometer.

Material And Methods: The study involved 50 samples from nanocomposite restoration material which were exposed under laboratory conditions to brushing with one of 4 types of toothpastes (control with no bleaching agents, peroxide paste with carbamide, abrasive and enzyme-based pastes). Using the parameters a, b and L obtained by spectrophotometry, delta E (ΔE) value was calculated.

[Study on the influence of whitening toothpastes on the nanocomposite material surface].

The influence of whitening toothpastes on the surface of nanocomposite dental restorative materials (24 samples divided in 3 groups according to type of toothpaste used) was studied using optical profilometry. The most significant changes on the surface roughness of the material caused abrasive whitening toothpaste in comparison to enzymes-based paste. Selection and use of whitening toothpastes in patients with dental restorations must be carried out under dentist's supervision.