Assessment of tooth bleaching efficacy with spectrophotometer
10.7518/hxkq.2014.03.012
- VernacularTitle:分光光度比色仪对牙齿漂白效果的分析
- Author:
Wenhao ZHU
1
;
Chang LIU
;
Jie PAN
Author Information
1. 北京大学口腔医学院·口腔医院综合科
- Keywords:
tooth bleaching;
spectrophotometer;
color measurement
- From:
West China Journal of Stomatology
2014;(3):259-262
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the changes in CIE L*, a*, and b* at cervical, body, and incisal sites after tooth bleaching by using a spectrophotometer. Methods Sixty-seven intact and healthy maxillary central incisors were in-vestigated. These incisors were darker than A3 according to the Vita Classical shade guide. The CIE tooth shade parameters L*, a*, and b* were simultaneously recorded at three tooth areas (cervical, body, and incisal) with a spectrophotometer before and after tooth bleaching (35%H2O2 coordinating with Beyond whitening accelerator irradiating). The shade dif-ferential (ΔE) was calculated. ANOVA, paired t-test, and Pearson correlation analysis were used for data analysis. Results The efficacy rates of tooth bleaching were satisfactory, with 86.6%, 86.6%, and 85.1% in the cervical, body, and incisal sites, respectively. The average values ofΔE were 5.09, 4.44, and 4.40 in the cervical, body, and incisal sites. Tooth bleaching significantly increased L* and significantly decreased a* and b* in all tooth areas (P<0.01). The decreasing range ofΔb* was more than the increasing range ofΔL* at the cervical site; opposite results were observed at the incisal site. A positive correlation was detected between baseline b*andΔE. Conclusion The spectrophotometer could objectively evaluate the whitening effect of tooth bleaching at the different tooth sites. The tooth bleaching system (35%H2O2 coordinating with Beyond whitening accelerator irradiating) exerts powerful bleaching actions in most of the tooth areas investigated. The order of tooth bleaching effectiveness is cervical>body>incisal. Yellow coloration is decreased mainly at the cervical site, and brightness was increased mostly at theincisal site. The effectiveness of tooth bleaching increases as the baseline b* value increases.
