用于冷光美白的二种比色板与牙齿间色差的比较

Comparison of the color difference between teeth underwent cold light whitening and two kinds of shade guides

目的:通过比较Vitapan Classical与Vita Bleachedguide 3D-Master比色板在评价冷光美白疗效中色标与对应牙齿的色差,评价哪种比色板与接受冷光美白的牙齿颜色匹配性更好。方法:2014年5月至2016年4月接受Beyond冷光美白的患者60例,根据评价疗效所采用的比色板不同随机分为Vitapan Classical比色板组和Vita Bleachedguide 3D-Master比色板组,2组均分别在治疗前后比色,并拍摄记录比色结果的数码照片。比色请2位医师分别独立进行,如果选择一致,共同的选择即为对应色标,如果选择不一致,再请第3位医师裁决。照片拍摄条件设定为:全牙列正面口内像,拍摄比例1∶3,光圈F22,快门速度1/200,闪光灯强度M/8,ISO值200。用Photoshop软件分析照片,测量牙齿与对应色标的色度值,计算色差值。色度值的测量请3位医师分别进行,每位医师对每张照片重复测量2遍,每张照片的6人次测量数据去掉最大值和最小值后,取平均值作为最终结果。采用成组设计的两样本均数t检验比较2组色差值。此外还分别记录了2组漂白后提高的色阶数。结果:Vitapan Classical和Vita Bleachedguide 3D-Master比色板与牙齿色差值分别为5.06±1.71和3.39±1.36,两组间差异有统计学意义(t=4.68,P<0.001)。Vitapan Classical比色组漂白后色阶提高3.63±1.75,Vita Bleachedguide 3D-Master比色组漂白后色阶提高2.23±1.01。结论:Vita Bleachedguide 3D-Master比色板与接受冷光美白的牙齿在颜色匹配方面更好,判断冷光美白疗效更加准确。

Objective： To investigate which shade guide,Vitapan Classical or Vita Bleachedguide 3 DMaster,is better matched with the color of teeth in judging whitening effect,by comparing the color difference between shade tabs and corresponding teeth underwent cold light tooth whitening. Methods： A total of 60 patients underwent Beyond cold light tooth whitening from May 2014 to April 2016. The patients were divided into two experimental groups according to the shade guide used. Vitapan Classical shade guide was used to judge whitening effect in one group,and Vita Bleachedguide 3 D-Master shade guide was used in another. Shade matching was carried out before and after whitening in both the two groups,and the results were recorded by digital photographs. Shade matching procedures were carried out by two doctors independently. If they chose the same tab,it would be seen as the shade matching result;While if they chose different tabs,another doctor would be invited to make a decision. Photographs were taken in preset conditions： intraoral photos of the full dentition in the front,and the proportion of shooting was 1 ∶ 3; aperture was F22; shutter speed was 1/200; intensity of flash was M/8; ISO value was 200.The photographs were analyzed by Photoshop software. Chromatic values were measured,and color difference values were calculated. Measuring of chromatic values was carried out by three doctors independently,and all the photos were measured twice by each doctor. Six measure results of each photo were recorded,and the maximum and the minimum were excluded,then the mean was seen as the final result.The color difference values were compared by independent-sample t test. Besides,changes of shade tabs after whitening in the two groups were recorded. Results： Color difference value was 5. 06 ± 1. 71 in Vitapan Classical group,and 3. 39 ± 1. 36 in Vita Bleachedguide 3 D-Master group. There was statistically significant difference between the two groups（ t = 4. 68,P〈0. 001）. Change of shade tabs was 3. 63 ±1. 75 in Vitapan Classical group,and 2. 23 ± 1. 01 in Vita Bleachedguide 3 D-Master group. Conclusion：Vita Bleachedguide 3 D-Master is better matched with the color of teeth,so it is preferred in judging the effect of cold light tooth whitening.