Division of Dental Biomaterials Science, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry.
Dent Mater J. 2020 Sep 29;39(5):742-751. doi: 10.4012/dmj.2019-202. Epub 2020 May 16.
The objective of this study was to examine the effects of storage conditions on the flexural strengths of resin composite materials for CAD/CAM restorations. Seven commercially available resin composite CAD/CAM blanks were examined. Rectangular specimens (4.0×1.2×4.0 mm) of each material were trimmed from the blanks and subjected to thermal cycling between 5°C and 55°C in deionized water at 10,000 cycles or stored in 37°C deionized water for one week or air for one day (n=10 for each condition). The difference in storage condition between water immersion and thermal cycling did not affect the flexural strengths of resin composite materials for CAD/CAM examined in this study. The resin composite block CS300 made from Bis-MEPP and UDMA showed the greatest flexural strength under all storage conditions and less deterioration of strength by thermal cycling and water immersion among the resin composite blocks tested.
本研究旨在考察储存条件对 CAD/CAM 修复用树脂复合材料弯曲强度的影响。对 7 种市售的 CAD/CAM 树脂复合材料进行了研究。从各材料的块状物上切下（4.0×1.2×4.0mm）矩形试件，并在去离子水中于 5°C 和 55°C 之间进行 10000 次热循环，或在 37°C 的去离子水中储存 1 周或在空气中储存 1 天（每种条件下各 10 个试件）。在本研究中，水浸泡和热循环之间的储存条件差异并不影响 CAD/CAM 用树脂复合材料的弯曲强度。在所有储存条件下，由 Bis-MEPP 和 UDMA 制成的 CS300 树脂复合材料块均表现出最大的弯曲强度，且在热循环和水浸泡条件下强度的劣化程度最小。
