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Related Experiment Videos

Assessing dentin color changes from nightguard vital bleaching.

A J McCaslin1, V B Haywood, B J Potter

  • 1Department of Pediatric Dentistry, School of Dentistry, Medical College of Georgia, Augusta, USA.

Journal of the American Dental Association (1939)
|November 26, 1999
PubMed
Summary
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At-home bleaching with 10 percent carbamide peroxide significantly lightens dentin. This color change occurs uniformly throughout the dentin, not just from the outside in.

Area of Science:

  • Dentistry
  • Dental Materials Science

Background:

  • At-home bleaching using 10% carbamide peroxide in custom trays is known to alter dentin color.
  • Understanding the uniformity of this color change is crucial for effective treatment.

Purpose of the Study:

  • To validate the color-changing effects of 10% carbamide peroxide on dentin.
  • To determine if dentin color change during bleaching is uniform or progresses from external to internal tooth structures.

Main Methods:

  • Extracted human teeth were sectioned and prepared for imaging.
  • Dentin areas (near dentinoenamel junction and pulpal wall) were marked for color analysis.
  • Teeth were bleached for 10 days with 10% carbamide peroxide, and digital photographs were analyzed for changes in lightness.

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Main Results:

  • A significant increase in lightness was observed in both inner and outer dentinal areas compared to controls (P = .01).
  • No significant difference was found in the rate of lightness change between inner and outer dentinal areas (P = .89).

Conclusions:

  • 10% carbamide peroxide bleaching causes a significant, uniform color change in dentin.
  • The uniform penetration and color change suggest stain type is key for successful bleaching of intrinsic discolorations.