Kimyai Soodabeh, Lahij Yasaman Ghavami, Daneshpooy Mehdi, Navimipour Elmira Jafari, Oskoee Parnian Alizadeh
Dental and Periodontal Research Center, School of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
Department of Operative Dentistry, School of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
Front Dent. 2020 Oct 28;17:27. doi: 10.18502/fid.v17i27.4651. eCollection 2020.
Considering the increasing use of vital bleaching procedures and the increased application of newly introduced resin-based materials for tooth restoration, this study was designed to evaluate the effect of 15% carbamide peroxide gel on the flexural strength of three resin-based restorative materials.
Three different types of restorative materials namely Beautifil II giomer, Cention N, and Z250 micro-hybrid composite resin were evaluated in this in vitro, experimental study. Twenty-four bar-shaped specimens were prepared from each restorative material, totaling 72 specimens, and were randomly assigned to two subgroups with and without bleaching procedure (n=12). In the bleaching subgroups, 15% carbamide peroxide gel was applied on the specimen surface 8 h a day for 14 days. The flexural strength of the specimens was then measured. Two-way ANOVA was used to compare the flexural strength of the specimens.
There was a significant reduction in the flexural strength of materials following exposure to the bleaching agent (P<0.05). The flexural strength was significantly higher in the groups that did not undergo bleaching. However, the mean flexural strength of the restorative materials was not significantly different (P=0.12).
The flexural strength of Beautifil II giomer, Cention N, and Z250 micro-hybrid composite resin could be compromised subsequent to bleaching with 15% carbamide peroxide gel. The three resin-based restorative materials exhibited similar flexural strength values irrespective of the use or no use of 15% carbamide peroxide gel.
鉴于活髓漂白程序的使用日益增加以及新引入的树脂基材料在牙齿修复中的应用增多，本研究旨在评估15%过氧化脲凝胶对三种树脂基修复材料弯曲强度的影响。
在这项体外实验研究中，评估了三种不同类型的修复材料，即Beautifil II聚硅氧烷增强型玻璃离子、Cention N以及Z250微混合复合树脂。从每种修复材料制备24个条形试件，共72个试件，并随机分为有漂白程序和无漂白程序的两个亚组（n = 12）。在漂白亚组中，将15%过氧化脲凝胶每天8小时涂覆在试件表面，持续14天。然后测量试件的弯曲强度。采用双向方差分析比较试件的弯曲强度。
材料暴露于漂白剂后弯曲强度显著降低（P < 0.05）。未进行漂白的组弯曲强度显著更高。然而，修复材料的平均弯曲强度没有显著差异（P = 0.12）。
用15%过氧化脲凝胶漂白后，Beautifil II聚硅氧烷增强型玻璃离子、Cention N和Z250微混合复合树脂的弯曲强度可能会受到影响。无论是否使用15%过氧化脲凝胶，这三种树脂基修复材料均表现出相似的弯曲强度值。
