Kim Jong-Eun, Lim Jung-Hwa, Kang You-Jung, Kim Jee-Hwan, Shim June-Sung
Department of Prosthodontics, Yonsei University College of Dentistry, Yonsei-ro 50-1, Seodaemun-gu, Seoul 03722, Korea.
Polymers (Basel). 2020 Jun 22;12(6):1396. doi: 10.3390/polym12061396.
Esthetic dental computer-aided design/computer-aided manufacturing (CAD/CAM) polymers such as disperse-filled composites (DFC) and polymer-infiltrated ceramic networks (PICN) should be subjected to surface treatment before bonding. However, such treatment can lead to defect formation and a decrease in strength. Therefore, in this study, we compared the flexural strengths of DFC and PICN materials air-abraded with alumina particles of different sizes at different pressures. In addition to Weibull analysis, the samples (untreated and treated) were characterized by scanning electron microscopy and atomic force microscopy. Both DFC and PICN exhibited the lowest flexural strength at large particle sizes and high pressures. Therefore, we optimized the air abrasion parameters to maintain the flexural strength and significantly increase surface roughness. In the case of DFC, the optimal particle size and pressure conditions were 50 µm at 2 bar and 110 µm at 1 bar, while for PICN, the best performance was obtained using AlO particles with a size of 50 µm at 1 bar. This study reveals that optimization of the surface treatment process is crucial in the fabrication of high-performance clinical materials for dental restorations.
美观牙科计算机辅助设计/计算机辅助制造（CAD/CAM）聚合物，如分散填充复合材料（DFC）和聚合物渗透陶瓷网络（PICN），在粘结前应进行表面处理。然而，这种处理可能导致缺陷形成和强度降低。因此，在本研究中，我们比较了在不同压力下用不同尺寸氧化铝颗粒进行空气研磨的DFC和PICN材料的抗弯强度。除了威布尔分析外，还通过扫描电子显微镜和原子力显微镜对样品（未处理和处理过的）进行了表征。DFC和PICN在大颗粒尺寸和高压下均表现出最低的抗弯强度。因此，我们优化了空气研磨参数，以保持抗弯强度并显著提高表面粗糙度。对于DFC，最佳颗粒尺寸和压力条件分别为2巴压力下50微米和1巴压力下110微米，而对于PICN，在1巴压力下使用50微米尺寸的AlO颗粒可获得最佳性能。本研究表明，表面处理工艺的优化对于制备用于牙齿修复的高性能临床材料至关重要。
