Furlan Isabella Spinardi, Bridi Enrico Coser, Amaral Flávia Lucisano Botelho do, França Fabiana Mantovani Gomes, Turssi Cecilia Pedroso, Basting Roberta Tarkany
Gen Dent. 2017 May-Jun;65(3):66-70.
The aim of this in vitro study was to evaluate enamel microhardness following bleaching treatments using either high- or low-concentration hydrogen peroxide (HP) agents containing calcium and/or fluoride. Sixty enamel blocks were bleached with 1 of 6 different bleaching agents (n = 10). The high-concentration HP agents were Whiteness HP Maxx (35% HP), Whiteness HP Blue (35% HP, 2% calcium gluconate), Pola Office+ (37.5% HP, 5% potassium nitrate), and Opalescence Boost (38% HP, 1.1% fluoride ion, 3% potassium nitrate). The low-concentration HP agents evaluated were Pola Day (9.5% HP) and White Class (10% HP, potassium nitrate, calcium, fluoride). High-concentration agents were applied in 3 sessions, whereas low-concentration agents were applied for 14 days. Knoop microhardness measurements were taken on the surface of the enamel before bleaching, at various timepoints during bleaching, and 14 days after the final bleaching treatment. The 2-way analysis of variance test showed that microhardness values were significantly influenced by the bleaching agent (P < 0.001) and application time (P < 0.001). The Tukey test showed that enamel bleached with Whiteness HP Maxx or White Class presented lower microhardness values than did the enamel treated with the remaining products. There was a reduction in micro-hardness values up to the end of the treatment. The results showed that the composition, concentration, and application protocol for each bleaching agent influenced the enamel microhardness values in that the microhardness decreased over time, regardless of the agent used or the addition of calcium and/or fluoride.
本体外研究的目的是评估使用含钙和/或氟的高浓度或低浓度过氧化氢（HP）制剂进行漂白处理后牙釉质的显微硬度。60个牙釉质块用6种不同漂白剂中的1种进行漂白（n = 10）。高浓度HP制剂有Whiteness HP Maxx（35% HP）、Whiteness HP Blue（35% HP，2%葡萄糖酸钙）、Pola Office+（37.5% HP，5%硝酸钾）和Opalescence Boost（38% HP，1.1%氟离子，3%硝酸钾）。评估的低浓度HP制剂有Pola Day（9.5% HP）和White Class（10% HP，硝酸钾、钙、氟）。高浓度制剂分3次应用，而低浓度制剂应用14天。在漂白前、漂白过程中的不同时间点以及最后一次漂白处理后14天，对牙釉质表面进行努氏显微硬度测量。双向方差分析测试表明，显微硬度值受漂白剂（P < 0.001）和应用时间（P < 0.001）的显著影响。Tukey检验表明，用Whiteness HP Maxx或White Class漂白的牙釉质的显微硬度值低于用其余产品处理的牙釉质。直至处理结束，显微硬度值均有降低。结果表明，每种漂白剂的成分、浓度和应用方案都会影响牙釉质的显微硬度值，即无论使用何种试剂或添加钙和/或氟，显微硬度都会随时间降低。
