Manzoli Tatiane Miranda, Costa Joatan Lucas de Sousa Gomes, Besegato João Felipe, Zaniboni Joissi Ferrari, Galvani Lucas David, Dantas Andréa Abi Rached, Kuga Milton Carlos
Department of Restorative Dentistry, School of Dentistry, Araraquara, São Paulo State University (UNESP), Araraquara, SP, Brazil.
Department of Restorative Dentistry, School of Dentistry, Araraquara, São Paulo State University (UNESP), Araraquara, SP, Brazil; Department of Restorative Dentistry, Federal University of Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
Photodiagnosis Photodyn Ther. 2023 Jun;42:103613. doi: 10.1016/j.pdpdt.2023.103613. Epub 2023 May 17.
The use of different concentrations of hydrogen peroxide (HP) photoactivated with LED/laser sources is common however, their influence on tooth structure is not yet fully elucidated. This study aimed to evaluate the pH, microhardness and surface roughness of different bleaching protocols photoactivated with LED/laser.
Forty bovine incisors were sectioned (7 × 7 × 2 mm) and randomized into four groups for analysis of pH (n = 5), microhardness and roughness (n = 10): HP35, HP6_L, HP15_L, HP35_L. The pH analysis was performed in the initial and final minute of the bleaching protocol. Microhardness and roughness were evaluated before and 7 days after the last bleaching session. Results were obtained from two-way ANOVA for repeated measures and Bonferroni post-test at a significance level of 5%.
HP6_L showed higher pH and greater stability between the initial and final evaluations, while the other groups showed similar pH with reduced values in the intragroup evaluation. No differences between groups in microhardness and roughness evaluations were observed.
Although HP6_L showed higher alkalinity and pH stability, none of the protocols reduced the microhardness and surface roughness of bovine enamel.
使用不同浓度的过氧化氢（HP）并通过发光二极管（LED）/激光源进行光活化很常见，然而，它们对牙齿结构的影响尚未完全阐明。本研究旨在评估经LED/激光光活化的不同漂白方案的pH值、显微硬度和表面粗糙度。
将40颗牛切牙切成（7×7×2毫米）薄片，并随机分为四组，用于分析pH值（n = 5）、显微硬度和粗糙度（n = 10）：HP35、HP6_L、HP15_L、HP35_L。在漂白方案的初始和最后一分钟进行pH值分析。在最后一次漂白疗程之前和之后7天评估显微硬度和粗糙度。结果通过重复测量的双向方差分析和Bonferroni事后检验获得，显著性水平为5%。
HP6_L在初始和最终评估之间显示出更高的pH值和更大的稳定性，而其他组在组内评估中显示出相似的pH值且有所降低。在显微硬度和粗糙度评估中未观察到组间差异。
尽管HP6_L显示出更高的碱度和pH稳定性，但没有一种方案降低了牛牙釉质的显微硬度和表面粗糙度。
