Enamel susceptibility to coffee and red wine staining at different intervals elapsed from bleaching: a photoreflectance spectrophotometry analysis.

Objective: This study aimed to investigate bleached enamel susceptibility to coffee and red-wine staining at different time periods after bleaching.

Background Data: Although hydrogen peroxide is effective for dental bleaching, little is known regarding color stability immediately after bleaching.

Materials And Methods: Fifty-four standardized bovine enamel slabs were obtained and assigned to the following treatments (n = 9): (CO) control: sound enamel surface submitted only to bleaching with 35% hydrogen peroxide (HP); (C30') enamel submitted to HP and coffee immersion at 30 min after bleaching; (C150') enamel submitted to HP and coffee immersion at 150 min after bleaching; (W30') enamel submitted to HP and red-wine immersion at 30 min after bleaching; and (W150') enamel submitted to HP and red-wine immersion at 150 min after bleaching.

Fourier transform-Raman and reflectance studies on dental enamel bleached with hydrogen peroxide activated using a light-emitting diode-laser system.

Objective: To evaluate the effects of 35% hydrogen peroxide bleaching on bovine teeth using reflectance and Fourier transform (FT)-Raman spectroscopy.

Background Data: Previous investigations have shown that hydrogen peroxide can modify dental components, but more studies are necessary to comprehend its effects.

Materials And Methods: Forty bovine enamel fragments (4.

Analysis of photoreflectance and microhardness of the enamel in primary teeth submitted to different bleaching agents.

Treatment of darkened teeth in children is of great importance from an esthetic-functional point of view and for the psychoemotional development of the child. The objective of the present study was to determine the in vitro efficacy of three bleaching agents for whitening of artificially stained primary teeth. Fifty anterior primary teeth were artificially stained and then divided into three experimental groups (n = 15) submitted to bleaching treatment with 35% hydrogen peroxide gel, 35% carbamide peroxide gel, and 35% carbamide peroxide gel mixed with sodium perborate powder.

Influence of coffee on reflectance and chemistry of resin composite protected by surface sealant.

Purpose: To assess the influence of the light-curing unit type and whether or not it was worth using surface sealant protection on resin composite restorative materials stained by coffee. Another objective was to propose the monitoring of coffee staining by FT-Raman spectroscopy using carbon-hydrogen (C-H) bonds as reference to the composite matrix degradation.

Methods: Sixty cylindrical specimens of resin composite were prepared and divided into six groups: HC (control)--cured with a halogen light; LC (control) cured with a LED; HF--cured with a halogen light + Fortify Plus; LF--cured with a LED + Fortify Plus; HP--cured with a halogen light + PermaSeal; LP--cured with a LED + PermaSeal.

Analyses by photoreflectance spectroscopy and Vickers hardness of conventional and laser-assisted tooth bleaching.

Purpose: To evaluate the in vitro effects of two bleaching products developed to be used with halogen or argon laser lights.

Methods: 20 human embedded third molars were cut into four parts resulting in 75 useful specimens. The specimens were divided at random into five groups and submitted to the traditional power bleaching procedure for enamel.