Journal article
Effect of tray-based and trayless tooth whitening systems on microhardness of enamel surface and subsurface
American journal of dentistry, Vol.17(6), pp.433-436
12/2004
PMID: 15724756
Abstract
To evaluate the effect of tray-based and trayless tooth whitening systems on surface and subsurface microhardness of human enamel.
Enamel slabs were obtained from recently extracted human third molars. Specimens were randomly assigned to six groups according to tooth whitening treatment (n = 10): 6.0% hydrogen peroxide (HP) (Crest Whitestrips), 6.5% HP (Crest Professional Whitestrips), 7.5% HP (Day White Excel 3), 9.5% HP (Day White Excel 3), 10% carbamide peroxide (Opalescence), and a control group (untreated). Specimens were treated for 14 days following manufacturers' recommended protocols, and were immersed in artificial saliva between treatments. Enamel surface Knoop microhardness (KHN) was measured immediately before treatment, and at days 1, 7, and 14 of treatment. After treatment, subsurface microhardness was measured at depths of 50-500 microm. Data were analyzed for statistical significance using analysis of variance.
Differences in microhardness for treated vs. untreated enamel surface were not statistically significant at any time interval. For 6.5% and 9.5% HP, there was a decrease in surface microhardness values during treatment, but at the end of treatment the microhardness values were not statistically different from the baseline values. For the enamel subsurface values, no differences were observed between treated vs. untreated specimens at each depth. Trayless and tray-based tooth whitening treatments do not significantly affect surface or subsurface enamel microhardness.
Details
- Title: Subtitle
- Effect of tray-based and trayless tooth whitening systems on microhardness of enamel surface and subsurface
- Creators
- Erica C N Teixeira - Department of Operative Dentistry, School of Dentistry, The University of North Carolina at Chapel Hill, 302 Brauer Hall, CB#7450, Chapel Hill, NC 27599-7450, USA. teixeire@dentistry.unc.eduAndré V RitterJeffrey Y ThompsonRalph H Leonard JrEdward J Swift Jr
- Resource Type
- Journal article
- Publication Details
- American journal of dentistry, Vol.17(6), pp.433-436
- Publisher
- United States
- PMID
- 15724756
- ISSN
- 0894-8275
- Language
- English
- Date published
- 12/2004
- Academic Unit
- Operative Dentistry
- Record Identifier
- 9984065803202771
Metrics
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