椅旁操作次数对恒温漂白活体上中切牙疗效的影响

The effect of chairside heat bleaching times on healthy central upper incisors

目的本实验旨在研究不同椅旁操作次数对活体上中切牙恒温漂白疗效的影响。方法受试者接受连续3次(每次间隔1 d)、每次45 min的恒温漂白治疗,以比色仪测量每次漂白前后上中切牙的L*、a*、b*颜色参数值,分析变化,并记录比色板比色结果。所得数据以配对t检验进行统计分析。结果统计分析显示,所有受试者接受漂白后牙体的L*、W(Lab)增大,b*降低,即牙齿的亮度和白度值增加,颜色向蓝色转变,且随漂白次数增多幅度变大,差别有统计学差异(P<0.05)。每次漂白操作后牙体颜色变化的色差均大于1.7个NBS单位,说明每次漂白后的颜色变化均能被肉眼辨别。结论增加漂白次数能提高漂白疗效。

Objective To study the effect of different chairside heat bleaching times on the healthy central upper incisors. Methods The subjects were treated with chairside heat bleaching for three times （an interval of one day）,45 minutes each time. Color param-eters of the six healthy central upper incisors before and after each time of bleaching by Wy10 were determined using a dental colorime-ter and a VITA classical shade guide. The statistical analysis of the results was performed using paired t-test. Results Paired t-test showed that L＊ and W（Lab）parameters of all the central upper incisors increased（P 〈 0. 05）and b＊ demonstrated a negative trend （P 〈 0. 05）,which meant that whiteness and brightness of the teeth improved and the incisors exhibited a blue-trend . The margin grew-with the increase in the number of operation times. Color difference after each time of bleaching could be identified by the human eye （ΔE 〈 1. 7）. Conclusions The increase in the number of operation times leads to the improvement of the heat bleaching effect.