Costa Joatan Lucas de Sousa Gomes, Nogueira Básia Rabelo, Batista de Oliveira Junior Osmir, Pretel Hermes
Department of Restorative Dentistry, School of Dentistry, São Paulo State University - UNESP, 3rd floor, Humaitá Street, 1680 - Centro, Mail Box: 331, Araraquara, São Paulo 14801-903, Brazil.
Department of Restorative Dentistry, School of Dentistry, São Paulo State University - UNESP, 3rd floor, Humaitá Street, 1680 - Centro, Mail Box: 331, Araraquara, São Paulo 14801-903, Brazil.
Photodiagnosis Photodyn Ther. 2022 Dec;40:103175. doi: 10.1016/j.pdpdt.2022.103175. Epub 2022 Nov 1.
The bleaching procedure consists of chemical principles of free radical release that react with chromophores, which results in an amount of energy released in this process. However, the evaluation of the electrical potential generated in these protocols has not yet been thoroughly investigated in the literature. Thus, this study aimed to examine variations in pH, mV, and temperature of different concentrations of hydrogen peroxide in the presence or absence of an intermittent LED/LASER photo acceleration system.
The study was divided into six groups (n = 9) according to the concentration of hydrogen peroxide (6%, 15%, and 35%), associated or not with the photo acceleration system LED/LASER. We followed the variation of pH, mV, and temperature at 1, 5, 10, 15, and 30 min after gel manipulation. Data were evaluated by two-way ANOVA of repeated measures (α =0.05).
pH, mV, and temperature of the groups showed statistical differences both in the light and bleach and in the interaction between the two factors (p < 0.0001), where pH and mV were more influenced by the bleach and light factor, while the temperature was influenced by the bleach factor associated with light. HP15 presented the most significant change in pH, mV, and temperature.
The use of LED/laser increased the temperature of the gels and altered the pH and mV kinetics of HP6 and HP15, which did not occur in HP35, possibly due to the high ionic potential linked to the concentration.
漂白过程涉及自由基释放的化学原理，自由基与发色团发生反应，在此过程中会释放一定量的能量。然而，这些方案中产生的电位评估在文献中尚未得到充分研究。因此，本研究旨在检测在有无间歇性LED/激光光加速系统的情况下，不同浓度过氧化氢的pH值、毫伏值和温度的变化。
根据过氧化氢浓度（6%、15%和35%），将研究分为六组（n = 9），每组分别使用或不使用LED/激光光加速系统。在凝胶处理后1、5、10、15和30分钟，我们跟踪pH值、毫伏值和温度的变化。数据通过重复测量的双向方差分析进行评估（α = 0.05）。
各组的pH值、毫伏值和温度在光照和漂白以及两个因素之间的相互作用方面均显示出统计学差异（p < 0.0001），其中pH值和毫伏值受漂白和光照因素的影响更大，而温度受与光照相关联的漂白因素影响。HP15在pH值、毫伏值和温度方面呈现出最显著的变化。
LED/激光的使用提高了凝胶的温度，并改变了HP6和HP15的pH值和毫伏值动力学，而HP35未出现这种情况，这可能是由于与浓度相关的高离子电位所致。
