| 3213 Spectrophotometric shade analysis of human teeth during vital bleaching | ||
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A. BRAUN, F. KRAUSE, and S. JEPSEN, University Dental Clinic Bonn, Germany Objectives: Determination of tooth color by visual means is considered highly subjective. It has been suggested that spectrophotometric shade analysis of human teeth is more accurate and more reproducible. The aim of the study was to evaluate tooth color before and after bleaching treatment with different bleaching agents using a spectrophotometer. Methods: Thirty patients were treated in a double-blind study design. Tooth shades of front teeth were determined in the LCH color space using a spectrophotometer. Employing gels containing 17% and 10% (test groups) or 0% (control group) carbamide peroxide, patients had to wear bleaching splints for two hours per day. After one week the differences in lightness (Dl), chroma (Dc) and hue (Dh) were measured. During the following two weeks patients did not perform any bleaching procedure. Then, tooth shades were evaluated again to assess regression of the resultant shade. For statistical analysis, ANOVA and comparison of mean values (Scheffé) were used. Results: Directly after bleaching in both test groups with either 17% (Dl: 2.80, Dc: -3.33, Dh: 0.60) or 10% peroxide(Dl: 2.61, Dc: -2.54, Dh: 0.09) a significant increase of lightness, decrease of chroma and slight increase in hue could be observed as compared to the control group (Dl: 0.13, Dc: 0.14, Dh: 0.21, p<0.05). After two weeks, a decrease of shade values could be observed in the test groups. Since there was a higher decrease in the 17% group (Dl: 2.07, Dc: -2.35, Dh: 0.07) than in the 10% group (Dl: 1.98, Dc: -2.31, Dh: 0.47) final values did not differ (p>0.05). Conclusions: The study indicates that both 10% and 17% carbamide peroxide containing bleaching gels can lighten teeth effectively regarding the LCH color space. Employing higher concentrated agents, more regression of the resultant shade has to be expected than with gels containing lower concentrated bleaching gels. | ||
| Seq #341 - Tooth Whitening 10:15 AM-11:30 AM, Saturday, 13 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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