Schmohl Leonie, Roesner Anuschka Josephine, Fuchs Florian, Wagner Maximilian, Schmidt Michael Benno, Hahnel Sebastian, Rauch Angelika, Koenig Andreas
Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Liebigstraße 12, 04103 Leipzig, Germany.
Department of Prosthetic Dentistry, Faculty of Medicine, Medical Center, Center for Dental Medicine University of Freiburg, Hugstetter Straße 55, 79106 Freiburg, Germany.
Biomedicines. 2022 Jun 11;10(6):1383. doi: 10.3390/biomedicines10061383.
Acid resistance of CAD/CAM resin composites. Erosion-related tooth surface loss is closely related to acid exposure, such as contact with acidic beverages or disease-related reflux. As a result, dental restorations in affected patients are also exposed to acids, which indicates that the performance and longevity of a dental restoration is impacted by the acid resistance of the individually employed restorative materials. However, unlike for ceramic materials, the acid resistance of CAD/CAM resin composites is not commonly evaluated by the manufacturers, and no standardised test methods have yet been established. Against this background, the present in vitro study aimed to examine the long-term resistance of CAD/CAM resin composites (Brilliant Crios, Cerasmart, Grandio blocs, Lava Ultimate, Shofu Block HC) against three acidic media (tonic water, acetic acid, hydrochloric acid) as well as demineralized water and to investigate potential damage mechanisms. Changes in surface roughness (Sa) were detected by confocal laser scanning microscopy (CLSM), and changes in surface hardness were measured using Vickers hardness (HV). The damage mechanisms were analysed by scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) and micro X-ray computer tomography (µXCT). For each material, few changes in either Sa or HV were identified for at least one of the different media; for Cerasmart, the sharpest deterioration in surface properties was observed. SEM-EDS revealed leaching of barium, aluminium, and titanium from fillers in a 2 µm zone on the rough but not on the polished surface of the specimen. Within the limitations of the current study, it can be concluded that polished CAD/CAM resin composites can be recommended for clinical use in patients with erosive conditions.
CAD/CAM树脂复合材料的耐酸性。与侵蚀相关的牙齿表面损失与酸暴露密切相关，例如接触酸性饮料或疾病相关的反流。因此，受影响患者的牙齿修复体也会接触到酸，这表明单个使用的修复材料的耐酸性会影响牙齿修复体的性能和使用寿命。然而，与陶瓷材料不同，CAD/CAM树脂复合材料的耐酸性通常不由制造商评估，并且尚未建立标准化的测试方法。在此背景下，本体外研究旨在检测CAD/CAM树脂复合材料（Brilliant Crios、Cerasmart、Grandio blocs、Lava Ultimate、Shofu Block HC）对三种酸性介质（奎宁水、乙酸、盐酸）以及软化水的长期耐受性，并研究潜在的损伤机制。通过共聚焦激光扫描显微镜（CLSM）检测表面粗糙度（Sa）的变化，使用维氏硬度（HV）测量表面硬度的变化。通过扫描电子显微镜（SEM）结合能量色散X射线光谱（EDS）和微型X射线计算机断层扫描（µXCT）分析损伤机制。对于每种材料，在至少一种不同介质中，Sa或HV几乎没有变化；对于Cerasmart，观察到表面性能恶化最为明显。SEM-EDS显示，在试样粗糙但非抛光表面的2 µm区域内，填充剂中的钡、铝和钛发生了浸出。在本研究的局限性范围内，可以得出结论，对于有侵蚀性情况的患者，推荐使用抛光的CAD/CAM树脂复合材料用于临床。
