Oper Dent. 2020 Jul 1;45(4):E176-E184. doi: 10.2341/19-070-L.
Computer-aided design/computer-aided manufacturing (CAD/CAM) composite resins are susceptible to degradation by dietary solvents. Dietary counselling is prudent when placing such CAD/CAM restorations.
This study determined the effect of dietary solvents on the surface roughness (Ra) of direct, indirect, and computer-aided design/computer-aided manufacturing (CAD/CAM) dental composites. The materials evaluated were a direct composite (Filtek Z350 XT [FZ]), an indirect composite (Shofu Ceramage [CM]), and four CAD/CAM composites (Lava Ultimate [LU], Shofu Block HC [HC], Cerasmart [CS], and Vita Enamic [VE]). Specimens (12×14×1.5 mm) of each material were prepared, measured for baseline Ra, ranked, divided into six groups (n=12), and conditioned in the following media for 1 week at 37°C: air (control), distilled water, 0.02 N citric acid, 0.02 N lactic acid, heptane, and 50% ethanol-water solution. The composite specimens were then subjected to postconditioning Ra testing using an optical three-dimensional surface analyzer (G4e, Alicona Imaging GmbH, Raaba, Austria). Inter-medium and inter-material comparisons were performed with one-way analysis of variance and post hoc Bonferroni test at a significance level of α=0.05. Mean Ra values ranged from 0.086 ± 0.004 μm to 0.153 ± 0.005 μm for the various material/medium combinations. For all materials, conditioning in air (control) and distilled water generally resulted in significantly lower mean Ra than exposure to other dietary solvents. Conditioning in citric acid presented the roughest surfaces for FZ, CM, and CS. For LU, HC, and VE, exposure to lactic acid, heptane, and ethanol solution resulted in the highest mean Ra. Regardless of conditioning media, FZ had the highest and VE the lowest mean Ra compared with other composites. The CAD/CAM composites remained susceptible to surface degradation by dietary solvents despite their industrial polymerization.
计算机辅助设计/计算机辅助制造 (CAD/CAM) 复合树脂易受饮食溶剂降解。在放置此类 CAD/CAM 修复体时，应谨慎进行饮食咨询。
本研究旨在确定饮食溶剂对直接、间接和计算机辅助设计/计算机辅助制造 (CAD/CAM) 牙科复合材料表面粗糙度 (Ra) 的影响。评估的材料有直接复合树脂 (Filtek Z350 XT [FZ])、间接复合树脂 (Shofu Ceramage [CM]) 和四种 CAD/CAM 复合材料 (Lava Ultimate [LU]、Shofu Block HC [HC]、Cerasmart [CS] 和 Vita Enamic [VE])。制备每个材料的 (12×14×1.5mm) 样本，测量基线 Ra 值，进行排序，分成六组 (n=12)，并在 37°C 下以下列介质处理 1 周：空气（对照）、蒸馏水、0.02N 柠檬酸、0.02N 乳酸、庚烷和 50%乙醇-水溶液。然后使用光学三维表面分析仪 (G4e，Alicona Imaging GmbH，Raaba，奥地利) 对复合样本进行后处理 Ra 测试。采用单向方差分析和事后 Bonferroni 检验对介质间和材料间进行比较，显著性水平为 α=0.05。各种材料/介质组合的 Ra 值平均值范围为 0.086±0.004μm 至 0.153±0.005μm。对于所有材料，与暴露于其他饮食溶剂相比，在空气（对照）和蒸馏水中的条件处理通常导致 Ra 值显著降低。FZ、CM 和 CS 在柠檬酸中的条件处理导致最粗糙的表面。对于 LU、HC 和 VE，暴露于乳酸、庚烷和乙醇溶液导致 Ra 值最高。无论条件处理介质如何，FZ 的 Ra 值均高于其他复合材料，VE 的 Ra 值最低。尽管 CAD/CAM 复合材料经过工业聚合，但它们仍然容易受到饮食溶剂的表面降解。
