Efficacy of a Novel At-home Bleaching Technique With Carbamide Peroxides Modified by CPP-ACP and Its Effect on the Microhardness of Bleached Enamel

Abstract

This study was designed to evaluate in vitro the efficacy of a novel at-home bleaching technique using 10% or 16% carbamide peroxide modified by casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) and its influence on the microhardness of bleached enamel. A total of 40 bovine incisors were divided into four groups (n=10) according to the bleaching agent used: 10% carbamide peroxide only; a blend of 10% carbamide peroxide and a CPP-ACP paste; 16% carbamide peroxide only; and a blend of 16% carbamide peroxide and a CPP-ACP paste. During the 14-day bleaching regimen, the samples were stored in artificial saliva. The Vickers microhardness and color of the teeth were assessed at baseline (T0) and immediately after the bleaching regimen (T14) using a microhardness tester and a spectrophotometer, respectively. The degree of color change was determined by the Commission Internationale de l'Eclariage (CIE) L*a*b* system (ΔE, ΔL*, Δa*, and Δb*) and Vita shade guide parameters. The data were analyzed by analysis of variance and the Tukey test (p<0.05). The teeth that were bleached with a blend of peroxide (10% or 16%) and the CPP-ACP paste presented increased microhardness values at T14 compared with T0, whereas the samples that were bleached with peroxide only did not show any differences in their microhardness values. All of the bleaching agents were effective at whitening the teeth and did not show a statistically significant difference using the CIEL*a*b* system (ΔE, ΔL*, Δa*, and Δb*) or the Vita shade guide parameters. The use of a CPP-ACP paste with carbamide peroxide bleaching agents increased the bleached enamel's microhardness and did not have an influence on whitening efficacy.

Bleaching Gels Containing Calcium and Fluoride: Effect on Enamel Erosion Susceptibility

“…These deposits may have acted as a physical barrier, minimizing the contact of the acid to enamel, or providing additional mineral to be dissolved during the acid challenge before the underlying enamel was attacked. Another forms of calcium combined with bleaching agents have been previously investigated, such as the casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) [39, 40] and calcium chloride [12], resulting in increased mechanical properties of bleached enamel.…”

Effect of home-bleaching gels modified by calcium and/or fluoride and the application of nano-hydroxyapatite paste onin vitroenamel erosion susceptibility

“…In the present study, HP supplemented with Ca was shown to be the most effective modified gel tested. Different forms of calcium have been added to bleaching gels, in an attempt to increase the chemical properties of bleached enamel [5,29]. The presence of calcium in the gel is expected to maintain the enamel calcium saturation during bleaching [6].…”

Micro-CT application for infiltration technology in paedodontics and orthodontics

“…Boersma et al investigated the prevalence of white spot lesions (WSL) at the end of orthodontic treatment by using the QLF (Quantitative Light-induced Fluorescence) technique and found that 97% of the subjects had one or more lesions [4]. For many years, dentistry was influenced by a mechanical approach characterized by the use of high-speed rotary cutting instruments and radical removal of diseased portions of the tooth, along with material-driven geometric extensions to areas that were assumed to be caries-resistant [5]. In all areas of medicine, there is a desire for less invasive, early protective and preventive procedures.…”