分光光度比色仪对牙齿漂白效果的分析  

Assessment of tooth bleaching efficacy with spectrophotometer

作　　者：朱文昊[1] 刘畅[1] 潘洁[1] 

机构地区：[1]北京大学口腔医学院.口腔医院综合科,北京100081

出　　处：《华西口腔医学杂志》2014年第3期259-262,共4页West China Journal of Stomatology

摘　　要：目的采用分光光度比色仪分析牙齿漂白后不同部位颜色CIE L*、a*、b*值的变化。方法选择67个健康完整的上颌中切牙,颜色大于A3(Vita经典比色板)。分光光度比色仪比色,记录颈部、体部、切端牙色。进行诊室漂白治疗(35%H2O2协同冷光漂白仪)后再次记录各部位牙色,计算ΔE、ΔL*、Δa*、Δb*和治疗有效率。对数据进行方差分析、配对t检验和Pearson相关分析。结果治疗有效率分别为:颈部86.6%,体部86.6%,切端85.1%。ΔE均值:颈部5.09,体部4.44,切端4.40。漂白后L*值升高,a*和b*值降低,均有统计学差异(P<0.01)。颈部和体部基线b*值与ΔE成正相关。结论 35%H2O2协同冷光漂白仪照射有较好的牙齿漂白效果,顺序为颈部>体部>切端。颈部黄色降低幅度最大,切端明度增加最多。基线b*值越高,色差越大。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.

关 键 词：牙齿漂白 分光光度比色仪 颜色测量 

分 类 号：R783.9[医药卫生—口腔医学]