Effect of tooth whitening on dental restorative materials

Evaluation of Bleaching on a CAD/CAM Hybrid Ceramic Material

“…In addition, the contact and possible diffusion of free radicals produced by bleaching agents can selectively extract the alkaline ions of ceramic network, causing damage [11,24]. The polymer network may also be affected by the erosion on the surface of the matrix and is dependent on resin matrix components and filler size [14,25].…”

“…Prolonged exposure to hydrogen peroxide affects the restoration surface and cause changes. In addition, an increase in the surface roughness may produce an increase in the accumulation of dental plaque, thus increasing the risk of secondary caries, periodontal inflammation [25,26].…”

What adverse effects does tooth-whitening have on dental restorations?

“…One study showed that exposure to 10% CP gel caused irregularities, cracks and pores in the surface ultramorphology of a high copper amalgam. 10 Similarly, surface irregularities were found to be visible on a scanning electron micrograph (SEM) of amalgam treated with higher concentrations of 16% or 30% CP. 11 The surface roughness of amalgam was also found to be significantly greater after exposure to 15% CP.…”

“…There were eight studies [6][7][8][9][10][11][12][13] that examined the effects of tooth whitening on amalgam.…”

“…Thirty-six studies were included within this review. 10,[13][14][15]17,20, Conflicting results on microhardness have been reported. Following bleaching, one invitro study found a reduced microhardness for nanofilled, silorane-based and hybrid types, whilst a microhybrid composite showed no significant changes.…”