PDF(Pubmed)
Abstract：
BACKGROUND: This study aimed to explore the effects of the titanium dioxide (TiO2) concentration and particle size in hydrogen peroxide (HP) on tooth bleaching effectiveness and enamel surface properties.
METHODS: TiO2 at different concentrations and particle sizes was incorporated into 40% HP gel to form an HP/TiO2 gel. The specimens were randomly divided into 8 groups: C1P20: HP + 1% TiO2 (20 nm); C3P20: HP + 3% TiO2 (20 nm); C5P20: HP + 5% TiO2 (20 nm); C1P100: HP + 1% TiO2 (100 nm); C3P100: HP + 3% TiO2 (100 nm); C5P100: HP + 5% TiO2 (100 nm); C0: HP with LED; and C0-woL: HP without LED. Bleaching was conducted over 2 sessions, each lasting 40 min with a 7-day interval. The color differences (ΔE00), whiteness index for dentistry (WID), surface microhardness, roughness, microstructure, and composition were assessed.
RESULTS: The concentration and particle size of TiO2 significantly affected ΔE00 and ΔWID values, with the C1P100 group showing the greatest ΔE00 values and C1P100, C3P100, and C5P100 groups showing the greatest ΔWID values (p < 0.05). No significant changes were observed in surface microhardness, roughness, microstructure or composition (p > 0.05).
CONCLUSIONS: Incorporating 1% TiO2 with a particle size of 100 nm into HP constitutes an effective bleaching strategy to achieve desirable outcomes.
METHODS: TiO2 at different concentrations and particle sizes was incorporated into 40% HP gel to form an HP/TiO2 gel. The specimens were randomly divided into 8 groups: C1P20: HP + 1% TiO2 (20 nm); C3P20: HP + 3% TiO2 (20 nm); C5P20: HP + 5% TiO2 (20 nm); C1P100: HP + 1% TiO2 (100 nm); C3P100: HP + 3% TiO2 (100 nm); C5P100: HP + 5% TiO2 (100 nm); C0: HP with LED; and C0-woL: HP without LED. Bleaching was conducted over 2 sessions, each lasting 40 min with a 7-day interval. The color differences (ΔE00), whiteness index for dentistry (WID), surface microhardness, roughness, microstructure, and composition were assessed.
RESULTS: The concentration and particle size of TiO2 significantly affected ΔE00 and ΔWID values, with the C1P100 group showing the greatest ΔE00 values and C1P100, C3P100, and C5P100 groups showing the greatest ΔWID values (p < 0.05). No significant changes were observed in surface microhardness, roughness, microstructure or composition (p > 0.05).
CONCLUSIONS: Incorporating 1% TiO2 with a particle size of 100 nm into HP constitutes an effective bleaching strategy to achieve desirable outcomes.
摘要：
背景：本研究旨在探索过氧化氢（HP）中二氧化钛（TiO2）的浓度和粒径对牙齿漂白效果和釉质表面特性的影响。
方法：将不同浓度和粒径的TiO2掺入40％HP凝胶中以形成HP/TiO2凝胶。将样品随机分为8组:C1P20:HP+1%TiO2(20纳米);C3P20:HP+3%TiO2(20纳米);C5P20:HP+5%TiO2(20纳米);C1P100:HP+1%TiO2(100纳米);C3P100:HP+3%TiO2(100纳米);C5P100:HP+5%TiO2(100纳米);无LED;C0-LED。漂白进行了两次会议，每次持续40分钟，间隔7天。色差(ΔE00),牙科白度指数（WID），表面显微硬度，粗糙度,微观结构，和成分进行了评估。
结果：TiO2的浓度和粒径显着影响ΔE00和ΔWID值，C1P100组显示最大的ΔE00值，C1P100、C3P100和C5P100组显示最大的ΔWID值（p<0.05）。表面显微硬度没有显著变化,粗糙度,微观结构或组成(p>0.05)。
结论:将1%粒径为100nm的TiO2掺入HP中构成了实现所需结果的有效漂白策略。
方法：将不同浓度和粒径的TiO2掺入40％HP凝胶中以形成HP/TiO2凝胶。将样品随机分为8组:C1P20:HP+1%TiO2(20纳米);C3P20:HP+3%TiO2(20纳米);C5P20:HP+5%TiO2(20纳米);C1P100:HP+1%TiO2(100纳米);C3P100:HP+3%TiO2(100纳米);C5P100:HP+5%TiO2(100纳米);无LED;C0-LED。漂白进行了两次会议，每次持续40分钟，间隔7天。色差(ΔE00),牙科白度指数（WID），表面显微硬度，粗糙度,微观结构，和成分进行了评估。
结果：TiO2的浓度和粒径显着影响ΔE00和ΔWID值，C1P100组显示最大的ΔE00值，C1P100、C3P100和C5P100组显示最大的ΔWID值（p<0.05）。表面显微硬度没有显著变化,粗糙度,微观结构或组成(p>0.05)。
结论:将1%粒径为100nm的TiO2掺入HP中构成了实现所需结果的有效漂白策略。
