Osiewicz Magdalena A, Werner Arie, Roeters Franciscus J M, Kleverlaan Cornelis J
Department of Integrated Dentistry, Jagiellonian University, Krakow, Poland; Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
Dent Mater. 2022 Mar;38(3):549-553. doi: 10.1016/j.dental.2021.12.138. Epub 2021 Dec 28.
Bulk-fill resin composites are a special group of restorative materials designed to reduce chair time needed to insert a direct composite restoration. However, other factors determine the clinical success of a restorative material. Clinically the major reasons for failure of direct restorations are secondary caries and fracture of the restoration or the tooth itself. In the long-term composite resin restorations in posterior teeth may be prone to wear. As bulk-fill materials have their own composition that will determine their mechanical properties, the wear resistance may be affected as well. The aim of this in vitro study was to evaluate the wear of bulk-fill composites in comparison with a conventional hybrid composite. The null hypothesis was that there are no differences between the four bulk-fill materials and one traditional highly filled nanohybrid composite for posterior use when subjected to a two-body wear rate test and hardness measurement.
Four bulk-fill composites SDR Smart Dentin Replacement (SDR), X-tra base (XBA), FiltekBulk Fill (FUP), Dual-Curing Bulk Composite (FBFL) and conventional nanohybrid resin composite Grandio (GDO) subjected to a two-body wear test against a stainless steel (SS) antagonist wheel. Scanning Electron Microscopy analysis was performed to detect the surface alterations. Microhardness of all samples was tested (n = 5) with a Vickers diamond indenter (5 indentations in each specimen). One-way ANOVA and Tukey's post hoc test (P < 0.01) were used to analyze differences in wear values. The hardness data were submitted to one-way ANOVA test, followed by the Tukey post hoc test (α = 0.05). T-test was applied to compare wear rate in time interval between one day and one month.
The highest wear rate values were recorded for SDR and the lowest wear rate values were for GDO. Hardness was the highest for GDO and the lowest for FBFL.
The bulk-fill composites have a higher wear rate and lower hardness than the conventional nanohybrid composite, making them less suitable for stress-bearing restorations.
大块充填树脂复合材料是一类特殊的修复材料，旨在减少直接复合树脂修复所需的就诊时间。然而，其他因素决定了修复材料的临床成功率。临床上，直接修复失败的主要原因是继发龋以及修复体或牙齿本身的折断。从长期来看，后牙的复合树脂修复可能易于磨损。由于大块充填材料有其自身的成分，这将决定其机械性能，其耐磨性也可能受到影响。本体外研究的目的是评估大块充填复合材料与传统混合复合材料相比的磨损情况。无效假设是，在进行双体磨损率测试和硬度测量时，四种大块充填材料与一种用于后牙的传统高填料纳米混合复合材料之间没有差异。
四种大块充填复合材料，即智能牙本质替代材料（SDR）、X-tra base（XBA）、Filtek Bulk Fill（FUP）、双固化大块复合材料（FBFL）以及传统纳米混合树脂复合材料Grandio（GDO），与不锈钢（SS）对磨轮进行双体磨损试验。进行扫描电子显微镜分析以检测表面变化。使用维氏金刚石压头对所有样本的显微硬度进行测试（n = 5）（每个样本进行5次压痕）。采用单因素方差分析和Tukey事后检验（P < 0.01）分析磨损值的差异。硬度数据进行单因素方差分析测试，随后进行Tukey事后检验（α = 0.05）。应用t检验比较一天和一个月时间间隔内 的磨损率。
SDR的磨损率最高，GDO的磨损率最低。GDO的硬度最高，FBFL的硬度最低。
大块充填复合材料比传统纳米混合复合材料具有更高的磨损率和更低的硬度，使其不太适合用于承受应力的修复。
