The effect of tooth bleaching using violet LED (405-410 nm) on the properties of resin-based composites.

Photodiagnosis and photodynamic therapy Pub Date : 2023-12-01 Epub Date: 2023-11-07 DOI:10.1016/j.pdpdt.2023.103883

Amanda Cavalcante Pereira Pinheiro, Olívia Vieira Aires, Mariana Rossi Carneiro Gasperini, Leonardo Custódio de Lima, Carlos Alberto Kenji Shimokawa, Míriam Lacalle Turbino

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Abstract

Background: The objective of this study was to evaluate the effect of bleaching techniques, including or not the use of violet light (405-410 nm), on resin-based composites' color, surface roughness, nanohardness, and elastic modulus.

Methods: Ninety-six disk-shaped specimens (12 mm x 2 mm; n = 12) were prepared using Filtek Z350 XT (Z350) and IPS Empress Direct (ED) resin-based composites. After 24 h, specimens were stained in red wine for 28 days. After staining, specimens were divided into four experimental groups: 40 % Hydrogen Peroxide (HP); Violet Light (VL); 40 % Hydrogen Peroxide associated with Violet Light (HP+VL), and a control group - no treatment (NT). Specimens were evaluated at six experimental times: initial (24 h after light curing); after staining and after the 1st, 2nd, 3rd, and 4th bleaching sessions regarding the color change (ΔE₀₀, L*, a*, b*, and WI_D); roughness (Ra), nanohardness and elastic modulus (GPa). Two-way analysis of variance for repeated measures was performed (α=0.05 %).

Results: There was a statistically significant difference between staining and the 1st bleaching session for all ED groups (p<0.05). After the last bleaching session, there were no differences between the experimental and the control groups of both resin-based composites. Bleaching using violet light did not change the roughness, nanohardness and elastic modulus of the tested resin-based composites (p>0.05).

Conclusions: Although hydrogen peroxide and violet light remove pigments from resin-based composites without affecting their surface roughness, nanohardness, and elastic modulus, the color change was similar to the one obtained by immersion in distilled water.

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使用紫LED（405-410nm）漂白牙齿对树脂基复合材料性能的影响。

背景：本研究的目的是评估漂白技术，包括是否使用紫外光（405-410nm），对树脂基复合材料的颜色、表面粗糙度、纳米硬度和弹性模量的影响。方法：96个圆盘状标本（12 mm x 2 mm；n = 12）使用Filtek Z350-XT（Z350）和IPS Empress Direct（ED）树脂基复合材料制备。24小时后，将标本在红酒中染色28天。染色后，将标本分为四个实验组：40%过氧化氢（HP）；紫外光（VL）；40%过氧化氢与紫外线相关（HP+VL），对照组-不治疗（NT）。在六个实验时间对样品进行评估：初始（光固化后24小时）；染色后以及第一、第二、第三和第四次漂白后关于颜色变化（ΔE00、L*、a*、b*和WID）；粗糙度（Ra）、纳米硬度和弹性模量（GPa）。对重复测量进行双向方差分析（α=0.05%）。结果：所有ED组的染色和第一次漂白之间存在统计学上的显著差异（p0.05）。结论：尽管过氧化氢和紫外光可以去除树脂基复合材料中的色素，但不会影响其表面粗糙度、纳米硬度和弹性模量，颜色变化类似于通过浸入蒸馏水中获得的颜色变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Photodiagnosis and photodynamic therapy

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