Makhdoom Sara N, Campbell Karen M, Carvalho Ricardo Marins, Manso Adriana Pigozzo
Department of Oral Health Sciences, Faculty of Dentistry, The University of British Columbia, Vancouver, Canada.
Graduate Program in Pediatric Dentistry, Faculty of Dentistry, University of Toronto, Toronto, Canada.
J Appl Oral Sci. 2020;28:e20190753. doi: 10.1590/1678-7757-2019-0753. Epub 2020 Jul 3.
Objectives To compare the microtensile bond strength (µTBS) and depth of cure (DOC) of bulk-fill composites cured by monowave (MW) and polywave (PW) LED units using different curing times. Methodology Three composites were tested: Tetric EvoCeram Bulk Fill (TBF), Filtek Bulk Fill (FBF), and Tetric EvoCeram (T; control). Flat dentin surfaces treated with adhesive (AdheSE Universal®, Ivoclar Vivadent) were bonded with 4 mm cylindrical samples of each bulk-fill composite material (n=6) and cured with monowave (Satelec) or polywave (Bluephase Style) curing units for 10 or 20 seconds. After 24 hours, teeth were sectioned into individual 0.9 mm2 beams and tested for µTBS. Failure modes were analysed. Moreover, the DOC scrape test (IOS 4090) was completed (n=5) following the same curing protocols. Two-way ANOVA (a=0.05) was performed, isolating light-curing units. Results For samples cured with the MW light-curing unit, no significant effects were observed in the µTBS results between any of the resin composite brands and the curing times. Conversely, when resins were cured with a PW light unit, a significant effect was observed for TBF resin. In general, bulk-fill composites presented greater DOC and longer curing time resulted in higher DOC for all composites. Conclusion The µTBS of the composites to dentin was not affected by the curing mode of the resins, except for TBF cured with PW light unit. Bulk-fill composites exhibit greater DOC than conventional resin-based composites.
目的 比较使用不同固化时间，通过单波（MW）和多波（PW）发光二极管（LED）装置固化的大块充填复合树脂的微拉伸粘结强度（µTBS）和固化深度（DOC）。方法 测试三种复合树脂：Tetric EvoCeram Bulk Fill（TBF）、Filtek Bulk Fill（FBF）和Tetric EvoCeram（T；对照）。用粘结剂（AdheSE Universal®，义获嘉伟瓦登特公司）处理过的平坦牙本质表面，与每种大块充填复合材料的4 mm圆柱形样本粘结（n = 6），并使用单波（Satelec）或多波（Bluephase Style）固化装置固化10或20秒。24小时后，将牙齿切成单个0.9 mm2的梁，并测试µTBS。分析失败模式。此外，按照相同的固化方案完成DOC刮擦测试（IOS 4090）（n = 5）。进行双向方差分析（α = 0.05），分离光固化装置。结果 对于用MW光固化装置固化的样本，在任何树脂复合品牌和固化时间之间的µTBS结果中未观察到显著影响。相反，当用PW光装置固化树脂时，观察到TBF树脂有显著影响。一般来说，大块充填复合树脂呈现出更大的DOC，并且更长的固化时间导致所有复合树脂的DOC更高。结论 除了用PW光装置固化的TBF外，复合树脂与牙本质的µTBS不受树脂固化模式的影响。大块充填复合树脂比传统树脂基复合树脂表现出更大的DOC。
