Department of Restorative Dental Science, College of Dentistry, University of Florida, Gainesville, Florida, USA.
LECOM School of Dental Medicine, Bradenton, Florida, USA.
J Esthet Restor Dent. 2020 Jul;32(5):512-520. doi: 10.1111/jerd.12616. Epub 2020 Jun 30.
The objective of this study is to test the wear of dual-cured bulkfill and flowable bulkfill composites.
Six dual-cured bulkfill composites, Cention, Cention-Exp, Activa, Fill-up, Hyperfil Injectafill, and two flowable bulkfill composites Tetric Evoflow BulkFill and G-aenial Universal Flo were tested in this study (n = 8). Each composite was applied into an aluminum sample holder and cured with a Valo Grand (1230 mW/cm ) or self-cured according to manufacturer's recommendations, and stored in water for 3 weeks. The samples were subjected to 120 000 load cycles of 49 N (CS-4) against spherical steatite antagonists and simultaneously subjected to 4440 thermocycles (5°C-55°C). At intervals between load cycles, polyvinyl siloxane impressions were taken and scanned with a True Definition Laser Scanner. The volumetric wear was calculated using image software (Geomagic). Microscopic images of selected wear facets and their corresponding worn antagonists were obtained using SEM. All data were analyzed using analysis of variance (ANOVA) and Tukey post hoc test for multiple comparison (α = .05; β = .2).
The load cycles volumetric wear-increase was linear. Two-way ANOVA showed significant main effects (material and light-cured) and significant interactions. Self-cured materials (mean = 0.38 mm ) showed more wear than light-cured materials (mean = 0.35mm ).
The bioactive materials except Activa light-cured showed significantly more wear than the flowable composites.
This study demonstrated that most of the dual-cured composites, if light-cured, showed the same wear as the flowable composites used as control. Therefore, to obtain adequate wear resistance the dual-cured composites should be routinely light-cured.
本研究旨在测试双固化型块状充填复合材料和流动性块状充填复合材料的磨损情况。
本研究共测试了 6 种双固化型块状充填复合材料（Cention、Cention-Exp、Activa、Fill-up、Hyperfil Injectafill）和 2 种流动性块状充填复合材料（Tetric Evoflow BulkFill 和 G-aenial Universal Flo）（n=8）。将每种复合材料涂覆于铝制样本架上，用光固化机（Valo Grand，1230mW/cm）或按制造商建议进行自固化，并于水中储存 3 周。将样本置于球形滑石对（49N）下进行 120000 次负载循环，同时进行 4440 次热循环（5°C-55°C）。在负载循环之间的间隔，使用聚硅氧烷印模材料制取印模并使用 True Definition 激光扫描仪进行扫描。使用图像软件（Geomagic）计算体积磨损量。使用扫描电子显微镜（SEM）获取选定磨损面及其对应的磨损对颌面的微观图像。采用方差分析（ANOVA）和 Tukey 事后多重比较检验（α=0.05；β=0.2）对所有数据进行分析。
负载循环的体积磨损量呈线性增加。双因素方差分析显示存在显著的主效应（材料和光固化）和显著的相互作用。自固化材料（平均 0.38mm）的磨损量明显高于光固化材料（平均 0.35mm）。
除 Activa 光固化材料外，其余生物活性材料的磨损量明显高于作为对照的流动性复合材料。
本研究表明，若用光固化，大多数双固化型复合材料的磨损情况与用作对照的流动性复合材料相同。因此，为获得足够的耐磨性，双固化型复合材料应常规进行光固化。
