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At least 775 records · Page 43Linked to original sources
PubMed1994

The effect of carbamide peroxide bleach on the tensile bond strength of ceramic brackets: an in vitro study.

Recent advances in cosmetic dentistry have led to the development of a variety of new products and techniques including vital bleaching and ceramic brackets. Therefore this study was conducted to see whether the use of an at-home carbamide peroxide bleaching agent before bonding affected the tensile bond strength of a precoated ceramic orthodontic bracket. Sixty extracted human premolar teeth were randomly separated into three groups of 20. Group 1 was a control group that was etched and bonded in the usual manner. Group 2 was immersed in a carbamide peroxide home bleaching agent for 72 hours before pumicing and bonding. Group 3 was also bleached for 72 hours but was immersed in distilled water for 1 week before bonding. The results indicated that recently bleached teeth have significantly reduced bond strength values when compared with both groups 1 and 3. We suggest that if a patient is using a tooth whitening product, that they discontinue its use at least 1 week before the bonding of orthodontic attachments.

Acid Etching, Dental↗
PubMed1994

Effect of hydrogen peroxide and sodium perborate on the microhardness of human enamel and dentin.

The effect of 30% hydrogen peroxide and a paste of sodium perborate mixed with hydrogen peroxide at different temperatures and time intervals on the microhardness of human enamel and dentin was examined. Intact extracted human teeth were sectioned, embedded in acrylic resin, polished, and divided into four test groups related to surface treatment. The groups were 30% hydrogen peroxide at 37 degrees C, 30% hydrogen peroxide at 50 degrees C in an illuminated chamber, a paste of sodium perborate mixed with hydrogen peroxide at 37 degrees C, and a paste of sodium perborate mixed with hydrogen peroxide at 50 degrees C in an illuminated chamber. Teeth treated with distilled water at either 37 degrees C or 50 degrees C served as controls. The results indicated that treatment with 30% hydrogen peroxide reduced the microhardness of both enamel and dentin. This reduction was statistically significant after 5-min treatment for the dentin and after 15-min treatment for the enamel (p < 0.05). Treatment with sodium perborate mixed with hydrogen peroxide did not alter the microhardness of either the enamel or dentin at the tested temperatures and time intervals. It is therefore suggested that the use of high concentrations of hydrogen peroxide for bleaching purposes should be limited. Sodium perborate appears to be a less damaging bleaching agent.

Borates↗
PubMed1991

[Scanning electronic microscopy analysis of the effect of bleaching solutions on fluorosed enamel].

The authors observed the bleaching of fluorosed human teeth with scanning electronic microscope (SEM). They found that the essence of the bleaching is the demineralization caused by the hydrochloric acid in the bleaching solutions. Physical grinding of the surface of the fluorosed enamel can accelerate the penetration of the solutions into enamel and shorten the bleaching time. The authors also observed the ultrastructural changes caused by the bleaching, and pointed out that the treatment of the bleached enamel surface is very important.

Fluorosis, Dental↗
PubMed1994

A method to determine the location and shape of an intracoronal bleach barrier.

The external cervical root resorption associated with intracoronal bleaching of pulpless teeth can be a devastating lesion. It often cannot be repaired. To prevent this problem, increasing attention has been focused on placing a barrier between the pulp chamber and the endodontic filling material. The objective of this article is to propose a method for determining the location and shape of an intracoronal bleach barrier.

Dental Pulp Devitalization↗
PubMed2002

Objective and subjective whitening response of two self-directed bleaching systems.

PURPOSE: To evaluate objective and subjective whitening responses of two marketed vital bleaching systems under intended use conditions. MATERIALSA ND METHODS: The randomized clinical trial evaluated 50 adults who received either a combination system with a 3% hydrogen peroxide bleaching gel, pre-formed dual arch tray, dentifrice and oral rinse (Rapid White), or 6% hydrogen peroxide whitening strips (Crest Whitestrips). Efficacy was assessed objectively from L*a*b* tooth color at Days 7 & 14, while subjective, first-person whitening perception was measured by questionnaire. A cumulative multinomial probability model was generated to predict subjective responses from objectively measured tooth color. RESULTS: At end-of-treatment, adjusted mean deltab* was -2.05 +/- 0.158 for the whitening strip group compared to -0.69 +/- 0.141 for the combination group, with these groups differing significantly (P < 0.0001). This response held across every color parameter and time point in this study. Relative to the combination system, subjects in the whitening strip group rated that product significantly (P < 0.01) more favorably with respect to the amount of whiteness improvement, as well as whitening satisfaction and overall impression. These subjective responses were correlated with objective changes in tooth color measured during treatment. When the deltab* effect was included in a cumulative multinomial probability model, deltaL*, deltaa*, and treatment were non-significant predictors. Odds ratios demonstrate that a subject had 3.3 times (1/0.3003 = 3.33) greater odds of selecting a higher whiteness rating when the value of deltab* was decreased by 1.0 unit (less yellowness). Similar results were noted for whitening satisfaction and overall impression of treatment.

Adolescent↗