Department of Dental Materials of the Postgraduate Program in Dentistry, Federal University of Pará - UFPA, Belém, PA, Brazil.
Department of Restorative Dentistry, School of Dentistry, Federal University of Minas Gerais - UFMG, Belo Horizonte, MG, Brazil.
Photodiagnosis Photodyn Ther. 2024 Feb;45:104006. doi: 10.1016/j.pdpdt.2024.104006. Epub 2024 Feb 7.
The photo-acceleration of bleaching gels by lights has been extensively researched. However, the induced temperature increase during this process needs to be further evaluated to prevent damage to the dental pulp. Therefore, the objective of this study was to evaluate the surface and intrapulpal temperature kinetics of different concentrations of hydrogen peroxide (HP) gels photo-accelerated by blue or violet light and infrared laser.
The whitening gels at concentrations of HP35, HP15, and HP6 % were irradiated with blue and violet LED/laser on the surface of a human canine tooth. The surface temperature variation (∆Ts) was evaluated using a pH meter, while the intrapulpal temperature variation (∆Ti) was assessed using a digital thermometer at intervals of 1, 15, and 30 min. Statistical analysis was conducted using a Two-way repeated measures ANOVA test, and Bonferroni post-test was applied at a significance level of 5 %.
All violet LED photo-accelerated groups showed a higher increase in ∆Ts compared to the blue LED/laser groups. However, there were no significant differences between the groups for ∆Ti.
Although the photo-acceleration of HP35 and HP15 % gels with violet LED/laser has a greater increase in surface temperature compared to HP6 % gel, the different light systems do not significantly increase the intrapulpal temperature.
光致漂白凝胶的加速已得到广泛研究。然而，在这个过程中，需要进一步评估所引起的温度升高，以防止对牙髓造成损害。因此，本研究的目的是评估不同浓度的过氧化物（HP）凝胶在蓝光或紫光和红外激光加速下的表面和牙髓内温度动力学。
将 HP35、HP15 和 HP6%浓度的漂白凝胶用蓝、紫 LED/激光照射在人犬牙表面。使用 pH 计评估表面温度变化（∆Ts），使用数字温度计在 1、15 和 30 分钟间隔评估牙髓内温度变化（∆Ti）。使用双向重复测量 ANOVA 检验进行统计分析，并在 5%的显著水平上应用 Bonferroni 事后检验。
所有紫 LED 光加速组的 ∆Ts 均比蓝 LED/激光组升高更高。然而，各组之间的 ∆Ti 没有显著差异。
尽管紫 LED/激光加速 HP35 和 HP15%凝胶的表面温度升高幅度大于 HP6%凝胶，但不同的光系统不会显著增加牙髓内温度。
