Effects of bleaching agent on physical and aesthetic properties of restorative materials

Abstract

To investigate the effects of bleaching agent on microhardness, color and light transmission of different restorative materials. Specimens (n=20) of Tetric EvoCeram (TEC), Tetric EvoCeram Bulk Fill (TECBF) and Equia Fill (EQUIA) were treated with either 40% hydrogen peroxide Opalesence Boost or destilled water for 45 min. Specimens were stained in tea solution or stored in deionized water for one and two weeks. Color, microhardness and light transmission were monitored at the baseline, after the bleaching and after the tea immersion or storage in deionized water. After the bleaching a significant reduction in surface microhardness (p<0.001) was recorded for all materials. Clinically visible color change (ΔE>3) was observed after the bleaching and after treatment in tea solution, but only in EQUIA samples. The absorption coefficient was the largest for the samples stained in tea solution. Bleaching can affect the microhardness and color of fillings; therefore, they should be sometimes replaced.

Hydrogen peroxide bleaching induces changes in the physical properties of dental restorative materials: Effects of study protocols

“…Although bleaching agents are effective, their effects on restorative materials have been controversial in previously published studies. The effects of bleaching on restorative materials are closely related to the exposure time, concentration, and pH of the bleaching gels . Bleaching agents are unstable and can release free radicals which may affect the polymer chains and double bonds of the composites or the organic matrix of the glass‐ionomer cements .…”

“…The effects of bleaching on restorative materials are closely related to the exposure time, concentration, and pH of the bleaching gels . Bleaching agents are unstable and can release free radicals which may affect the polymer chains and double bonds of the composites or the organic matrix of the glass‐ionomer cements . Given that contemporary dental restorative materials have different compositions, the effects of bleaching on dental restorative materials are believed to be material‐dependent.…”

Does Bleaching Affect the Microleakage of Class II Restoration with Bulk-Fill Composite?

“…However, the type of composite used in terms of the amount of filler, the type of monomer, the degree of curing, and intensity of the optical hardener can all be effective in success of these restorations [ 18 ]. Along with cosmetic restorations, in the recent decades, bleaching (teeth whitening) treatment has received a great deal of attention, and this treatment can have different effects on the patients' restorations [ 19 ]. In this study, the degree of microleakage of class II bulk-fill composite resin restorations was investigated compared to conventional composites with and without bleaching conditions.…”

The effect of a bleaching agent on the pigment removal and the bond strength of bulk-fill resin composites: an in vitro study

“…The integrity and the color stability of restorations can be adversely affected by beverage consumption such as coffee, tea and wine. The staining agents can cause physical or chemical degradation to the structure of the resin composite restorations, compromising their quality 1,2 . Bleaching procedures have been indicated to treat pigmented or darkened teeth as they are easy and cost-effective to treatments 3 . However, patients that undergo such treatments may have restored teeth and the bleaching gel can increase the solubility of the materials.…”