Koc-Vural Uzay, Baltacioglu Ismail, Altinci Pinar
Department of Restorative Dentistry, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
Department of Restorative Dentistry, Faculty of Dentistry, Ankara University, Ankara, Turkey.
Restor Dent Endod. 2017 May;42(2):118-124. doi: 10.5395/rde.2017.42.2.118. Epub 2017 Mar 6.
This study aimed to evaluate the color stability of bulk-fill and nanohybrid resin-based composites polished with 3 different, multistep, aluminum-oxide impregnated finishing and polishing disks.
Disk-shaped specimens (8 mm in diameter and 4 mm in thickness) were light-cured between two glass slabs using one nanohybid bulk-fill (Tetric EvoCeram, Ivoclar Vivadent), one micro-hybrid bulk-fill (Quixfil, Dentsply), and two nanohybrid incremental-fill (Filtek Ultimate, 3M ESPE; Herculite XRV Ultra, Kerr) resin-based composites, and aged by thermocycling (between 5 - 55℃, 3,000 cycles). Then, they were divided into subgroups according to the polishing procedure as SwissFlex (Coltène/Whaledent), Optidisc (Kerr), and Praxis TDV (TDV Dental) ( = 12 per subgroup). One surface of each specimen was left unpolished. All specimens were immersed in coffee solution at 37℃. The color differences (ΔE) were measured after 1 and 7 days of storage using a colorimeter based on CIE Lab system. The data were analyzed by univariate ANOVA, Mann-Whitney U test, and Friedmann tests (α = 0.05).
Univariate ANOVA detected significant interactions between polishing procedure and composite resin and polishing procedure and storage time ( < 0.05). Significant color changes were detected after 1 day storage in coffee solution ( < 0.05), except Quixfil/Optidisc which was color-stable after 7 days ( > 0.05). Polishing reduced the discoloration resistance of Tetric EvoCeram/SwissFlex, Tetric EvoCeram/Praxis TDV, Quixfil-SwissFlex, and all Herculite XRV Ultra groups after 7 days storage ( < 0.05).
Discoloration resistance of bulk-fill resin-based composites can be significantly affected by the polishing procedures.
本研究旨在评估采用3种不同的多步骤氧化铝浸渍型精修和抛光盘对大块充填和纳米混合树脂基复合材料进行抛光后的颜色稳定性。
使用1种纳米混合大块充填树脂（Tetric EvoCeram，义获嘉伟瓦登特公司）、1种微混合大块充填树脂（Quixfil，登士柏公司）以及2种纳米混合逐层充填树脂（Filtek Ultimate，3M ESPE公司；Herculite XRV Ultra， Kerr公司）的树脂基复合材料，在两块玻璃板之间光固化制成圆盘状试件（直径8 mm，厚4 mm），并通过热循环（5 - 55℃，3000次循环）进行老化处理。然后，根据抛光程序将其分为瑞士Flex（库尔泰恩/惠尔登特公司）、Optidisc（Kerr公司）和Praxis TDV（TDV牙科公司）亚组（每组n = 12）。每个试件的一个表面不进行抛光。将所有试件浸入37℃的咖啡溶液中。使用基于CIE Lab系统的色差仪在储存1天和7天后测量颜色差异（ΔE）。数据采用单因素方差分析、曼-惠特尼U检验和弗里德曼检验进行分析（α = 0.05）。
单因素方差分析检测到抛光程序与复合树脂以及抛光程序与储存时间之间存在显著交互作用（P < 0.05）。在咖啡溶液中储存1天后检测到显著的颜色变化（P < 0.05），但Quixfil/Optidisc在7天后颜色稳定（P > 0.05）。储存7天后，抛光降低了Tetric EvoCeram/SwissFlex、Tetric EvoCeram/Praxis TDV、Quixfil - SwissFlex以及所有Herculite XRV Ultra组的抗变色性（P < 0.05）。
大块充填树脂基复合材料的抗变色性会受到抛光程序的显著影响。
