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Composite resin color change after vital tooth bleaching
P Monaghan1, T Trowbridge, E Lautenschlager
1Northwestern University Dental School, Chicago, Ill.
The Journal of Prosthetic Dentistry
|June 1, 1992
Summary
Vital bleaching significantly altered the color of most composite resins, with some showing visible lightening. This dental technique can effectively improve the appearance of stained or discolored composite restorations.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Aesthetic Dentistry
Background:
- Composite resins are widely used in dental restorations.
- Discoloration of composite restorations can negatively impact aesthetics.
- Vital bleaching is a common procedure for tooth whitening.
Purpose of the Study:
- To evaluate the color change in composite resin materials after vital bleaching.
- To determine if vital bleaching can lighten discolored composite restorations.
Main Methods:
- Composite resin specimens were subjected to four sessions of vital bleaching (37% H3PO4 followed by 30% H2O2 with infrared light).
- Color change was measured using the Minolta Chroma meter (CR-100) by recording L*a*b* values before and after bleaching.
- Delta E values were calculated to quantify the color difference, with controls stored in water alone.
Main Results:
- Significant color change (delta E) was observed in most composite resin materials after vital bleaching.
- Several materials exhibited delta E values greater than 3, indicating a visually perceptible lightening.
- Water storage alone did not cause significant color changes in control specimens.
Conclusions:
- Vital bleaching effectively induces color change in a majority of composite resin materials.
- This method shows potential for lightening dark or stained composite resin restorations, improving aesthetic outcomes.