Fernandes Renan Aparecido, Strazzi-Sahyon Henrico Badaoui, Suzuki Thaís Yumi Umeda, Briso André Luiz Fraga, Dos Santos Paulo Henrique
Department of Dental Materials and Prosthodontics, School of Dentistry of Araçatuba, São Paulo State University, Araçatuba, SP, Brazil.
Department of Restorative Dentistry, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil.
Restor Dent Endod. 2020 Jan 10;45(1):e12. doi: 10.5395/rde.2020.45.e12. eCollection 2020 Feb.
The aim of this study was to evaluate the microhardness and surface roughness of composite resins before and after tooth bleaching procedures.
Sixty specimens were prepared of each composite resin (Filtek Supreme XT and Opallis), and BisCover LV surface sealant was applied to half of the specimens. Thirty enamel samples were obtained from the buccal and lingual surfaces of human molars for use as the control group. The surface roughness and microhardness were measured before and after bleaching procedures with 35% hydrogen peroxide or 16% carbamide ( = 10). Data were analyzed using 1-way analysis of variance and the Fisher test (α = 0.05).
Neither hydrogen peroxide nor carbamide peroxide treatment significantly altered the hardness of the composite resins, regardless of surface sealant application; however, both treatments significantly decreased the hardness of the tooth samples ( < 0.05). The bleaching did not cause any change in surface roughness, with the exception of the unsealed Opallis composite resin and dental enamel, both of which displayed an increase in surface roughness after bleaching with carbamide peroxide ( < 0.05).
The microhardness and surface roughness of enamel and Opallis composite resin were influenced by bleaching procedures.
本研究旨在评估牙齿漂白程序前后复合树脂的显微硬度和表面粗糙度。
每种复合树脂（Filtek Supreme XT和Opallis）制备60个样本，一半样本应用BisCover LV表面封闭剂。从人类磨牙的颊面和舌面获取30个牙釉质样本作为对照组。使用35%过氧化氢或16%尿素（=10）进行漂白程序前后测量表面粗糙度和显微硬度。数据采用单因素方差分析和Fisher检验进行分析（α = 0.05）。
无论是否应用表面封闭剂，过氧化氢和过氧化脲处理均未显著改变复合树脂的硬度；然而，两种处理均显著降低了牙齿样本的硬度（<0.05）。除未封闭的Opallis复合树脂和牙釉质外，漂白未导致表面粗糙度发生任何变化，这两种材料在用过氧化脲漂白后表面粗糙度均增加（<0.05）。
漂白程序会影响牙釉质和Opallis复合树脂的显微硬度和表面粗糙度。
