Elmarsafy Sahar Mohamed, Abdelwahab Safinaz Abdelfatah, Hussein Fatma
Department of Conservative Dentistry, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt.
Department of Restorative Dentistry, Faculty of Dental Medicine, Umm Al-Qura University, Makkah, Saudi Arabia.
Dent Res J (Isfahan). 2023 Mar 28;20:35. eCollection 2023.
Surface smoothness considered to be a significant part of the appearance and success of the restorative materials. The aim of this study was to assess the influence of four different polishing systems on surface roughness of four resin composite materials when subjected to thermocycling.
This research was designed as a comparative study. Four resin composites were used which are: Nanofill composite (Filtek Supreme XT), nanohybrid composite (Tetric EvoCeram), microfill composite (Renamel Microfill), and microhybrid composite (Filtek Z250). Sixty disk-shaped specimens of each resin composite were prepared then divided into four groups according to the polishing system ( = 15); which were Sof-Lex Spiral, Diatech Shapeguard, Venus Supra, and Astropol. The specimens of each group were polished following the manufactures' instructions, then surface roughness, R values in μm were measured initially and after the specimens subjected to thermal cycling. The influence of resin composites, polishing systems, thermocycling, and their interaction effects on surface roughness (R mean values) was statistically analyzed mainly by using the repeated measures two-way analysis of variance test, whereas the Bonferroni''s test was applied for pair-wise comparisons. ≤ 0.05 was used as the significant level.
The results of this study revealed that Filtek Supreme XT recorded significantly the lowest mean surface roughness (R) of 0.2533 ± 0.073 μm ( < 0.001). The Sof-Lex Spiral polishing system revealed significantly the lowest mean surface roughness (Ra) of 0.2734 ± 0.0903 μm ( = 0.004). Regardless of composite type and polishing system, there was a statistically significant increase in mean surface roughness values (R) in μm after thermocycling (0.2251 ± 0.0496 μm and 0.3506 ± 0.0868 μm, respectively) ( < 0.001).
Resin composite type, polishing method, and thermocycling aging significantly affected the surface roughness of composites; Nanofill composite and Sof-Lex Spiral polishing system provided the lowest values of surface roughness which increased after thermocycling.
表面光滑度被认为是修复材料外观和成功应用的重要组成部分。本研究的目的是评估四种不同的抛光系统对四种树脂复合材料在热循环作用下表面粗糙度的影响。
本研究设计为一项对比研究。使用了四种树脂复合材料，分别是：纳米填料复合树脂（Filtek Supreme XT）、纳米混合复合树脂（Tetric EvoCeram）、微填料复合树脂（Renamel Microfill）和微混合复合树脂（Filtek Z250）。每种树脂复合材料制备60个圆盘形试件，然后根据抛光系统分为四组（每组n = 15）；分别是Sof-Lex Spiral、Diatech Shapeguard、Venus Supra和Astropol。每组试件按照制造商的说明进行抛光，然后在试件进行热循环之前和之后测量表面粗糙度，以μm为单位的R值。主要使用重复测量双向方差分析测试对树脂复合材料、抛光系统、热循环及其对表面粗糙度（R平均值）的交互作用影响进行统计分析，而使用Bonferroni检验进行两两比较。P≤0.05被用作显著性水平。
本研究结果显示，Filtek Supreme XT的平均表面粗糙度（R）最低，为0.2533±0.073μm（P<0.001）。Sof-Lex Spiral抛光系统的平均表面粗糙度（Ra）最低，为0.2734±0.0903μm（P = 0.004）。无论复合材料类型和抛光系统如何，热循环后以μm为单位的平均表面粗糙度值（R）均有统计学显著增加（分别为0.2251±0.0496μm和0.3506±0.0868μm）（P<0.001）。
树脂复合材料类型、抛光方法和热循环老化显著影响复合材料的表面粗糙度；纳米填料复合树脂和Sof-Lex Spiral抛光系统提供了最低的表面粗糙度值，热循环后该值增加。
