Abstract

This study examined the influence of two in-office bleaching on surface roughness, topography and microhardness of RMGIs. Disc-shape samples of RMGIs (Ketac N100, Fuji II LC-Capsule, and Photac Fil Quick Aplicap) were prepared and polymerized by a LED light curing unit. Polished samples, were subjected to in-office bleaching agents, Opalescence Xtra Boost (OXB) and Pola Office (PO), for 3 consecutive applications of 15 min each. The surface roughness parameters (R _a and R _max, μm) and Knoop hardness number (KHN, kg/mm²) were measured using contact profilometer and microhardness tester, respectively. The surface topography of the bleached surfaces was evaluated by SEM. Two-way ANOVA demonstrated high significant differences between the KHN, R _a and R _max values among the RMGIs and the bleaching agents evaluated as well as their interactions (p < 0.05). Pearson’s correlation indicated mainly no significant correlation between KHN and R _a surface finish at each in-office agent for each RMGI (p > 0.05). Low R _a (0.193 µm) and high KHN (49.34) values were presented in N100, whereas high R _a (0.916 µm) and low KHN (31.54) were found in PFQ and FII, respectively, after bleaching with OXB. Surface properties are affected by the differences in material’s composition, mainly fillers, and type of bleaching agent. High concentration of hydrogen peroxide from bleaching agent and type of RMGIs can influence the chemical softening of these restorations and their clinical durability.

摘要

这项研究检查了两次办公室漂白对RMGI的表面粗糙度，形貌和显微硬度的影响。制备了RMGI的圆盘状样品（Ketac N100，Fuji II LC-Capsule和Photac Fil Quick Aplicap），并通过LED光固化装置进行了聚合。抛光后的样品要经过办公室漂白剂Opalescence Xtra Boost（OXB）和Pola Office（PO），连续3次应用，每次15分钟。表面粗糙度参数（R _a和R _max，μm）和努氏硬度值（KHN，kg / mm ^2））分别使用接触轮廓仪和显微硬度测试仪测量。通过SEM评估漂白表面的表面形貌。双向方差分析表明，RMGI和所评估的漂白剂之间的KHN，R _a和R _max值之间存在显着高差异（p  <0.05）。皮尔森相关性表明，对于每种RMGI，每种办公室剂中KHN与R _a表面粗糙度之间均无显着相关性（p  > 0.05）。N100的R _a（0.193 µm）低，KHN（49.34）高，而R _a高用OXB漂白后，分别在PFQ和FII中发现（0.916 µm）和低KHN（31.54）。表面性能受材料成分（主要是填料）和漂白剂类型差异的影响。来自漂白剂的高浓度过氧化氢和RMGI的类型会影响这些修复体的化学软化及其临床耐久性。