Ebrahimi Chaharom Mohammad Esmaeel, Bahari Mahmoud, Kimyai Soodabeh, Bagban Nikzad Helia
Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
J Dent Res Dent Clin Dent Prospects. 2024 Fall;18(4):272-277. doi: 10.34172/joddd.41450. Epub 2024 Dec 14.
Considering the few studies on the effect of bleaching protocols on the color properties of a newly developed monochromatic universal composite resin, the present study evaluated the effect of different bleaching protocols on the color change and translucency of Omnichroma (OMN) composite resin.
In this laboratory study, 45 cylindrical OMN composite resin disks with a diameter of 10 mm and a thickness of 2 mm were used. The samples were randomly divided into three groups (n=15) based on the bleaching protocols: group 1: 40% hydrogen peroxide (HP) for 20 minutes, twice a day for three sessions one week apart; group 2: 20% carbamide peroxide (CP) for 8 hours a day, for 14 consecutive days; group 3: 40% HP with Nd:YAG laser (HP+Nd:YAG laser) applied on the gel for 30 seconds twice. Baseline and post-bleaching measurements of color parameters were done using a Vita Easyshade spectrophotometer. Data was analyzed using paired-samples t-test, one-way ANOVA, and post hoc Tukey tests (<0.05).
All the bleaching protocols significantly changed the color (<0.001) and translucency (<0.001) parameters. CP caused the most color changes (<0.05) and translucency (<0.05), which were significant, and color and translucency changes caused by HP and HP+Nd:YAG laser were not significant (>0.05).
Bleaching caused a noticeable change in the color and translucency of the OMN composite resin. The effect of the at-home bleaching protocol was greater than the in-office ones.
鉴于关于漂白方案对新开发的单色通用复合树脂颜色特性影响的研究较少，本研究评估了不同漂白方案对Omnichroma（OMN）复合树脂颜色变化和透明度的影响。
在本实验室研究中，使用了45个直径为10毫米、厚度为2毫米的圆柱形OMN复合树脂盘。根据漂白方案将样本随机分为三组（n = 15）：第1组：40%过氧化氢（HP）处理20分钟，每天两次，共三个疗程，间隔一周；第2组：20%过氧化脲（CP）每天处理8小时，连续处理14天；第3组：在凝胶上应用40% HP与钕钇铝石榴石激光（HP + Nd:YAG激光），每次30秒，共两次。使用Vita Easyshade分光光度计进行颜色参数的基线和漂白后测量。数据采用配对样本t检验、单因素方差分析和事后Tukey检验进行分析（<0.05）。
所有漂白方案均显著改变了颜色（<0.001）和透明度（<0.001）参数。CP引起的颜色变化（<0.05）和透明度变化（<0.05）最为显著，而HP和HP + Nd:YAG激光引起的颜色和透明度变化不显著（>0.05）。
漂白导致OMN复合树脂的颜色和透明度发生明显变化。家庭漂白方案的效果大于诊室漂白方案。
