Torres Carlos Rocha Gomes, Zanatta Rayssa Ferreira, Fonseca Beatriz Maria, Borges Alessandra Bühler
Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University-UNESP, São Paulo, Brazil,
Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University-UNESP, São Paulo, Brazil.
Am J Dent. 2019 Feb;32(1):43-46.
To evaluate the effects of different white spot lesion (WSL) treatments associated with dental bleaching on the fluorescence of dental enamel.
80 flat enamel disks (3 mm diameter and 1 mm thick) were obtained from bovine incisors. The initial fluorescence (fluorescent emission or Delta E*ab- FL units) of the specimens was measured using a spectrophotometer. Artificial caries was created in all specimens, and the measurements were repeated. The specimens were divided into four groups according to the treatment applied (n = 20): CON (control) - immersion in ultrapure water for 8 weeks; SAL - immersion in artificial saliva for 8 weeks; FL - daily application of 0.05% sodium fluoride for 1 minute/artificial saliva for 8 weeks; and ICON - resin infiltration (Icon). After the treatments, the assessments were repeated. Dental bleaching using 35% hydrogen peroxide gel was performed on all specimens for 30 minutes, and the measurements were made again after 7 days. Data were submitted to ANOVA and Tukey tests across the treatments for each moment of evaluation.
Fluoride and saliva remineralization were not able to change enamel fluorescence, even after bleaching. Only resin infiltration increased the enamel fluorescence; however, after bleaching, all groups presented similar values. Icon increased translucency immediately after application, but bleaching reduced it to its initial values.
Changes of fluorescence in infiltrated enamel might lead to unsatisfactory esthetics under certain conditions such as ultraviolet light.
评估与牙齿漂白相关的不同白斑病变（WSL）治疗方法对牙釉质荧光的影响。
从牛的切牙获取80个扁平牙釉质圆盘（直径3毫米，厚1毫米）。使用分光光度计测量标本的初始荧光（荧光发射或ΔE*ab - FL单位）。在所有标本中制造人工龋，并重复测量。根据所应用的治疗方法将标本分为四组（n = 20）：CON（对照组） - 浸入超纯水8周；SAL - 浸入人工唾液8周；FL - 每天应用0.05%氟化钠1分钟/人工唾液8周；以及ICON - 树脂渗透（Icon）。治疗后，重复评估。对所有标本使用35%过氧化氢凝胶进行牙齿漂白30分钟，并在7天后再次进行测量。在每个评估时刻，将数据提交给方差分析和Tukey检验以进行各治疗组间的比较。
即使在漂白后，氟化物和唾液再矿化也无法改变牙釉质荧光。只有树脂渗透增加了牙釉质荧光；然而，漂白后，所有组呈现相似的值。Icon在应用后立即增加了透明度，但漂白将其降低至初始值。
在某些条件下，如紫外线照射下，渗透牙釉质中荧光的变化可能导致美学效果不理想。
