Turker Izim, Kursoglu Pinar
Department of Prosthodontics, School of Dental Medicine, Bahçeşehir University, Istanbul, Turkey.
Department of Prosthodontics, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey.
J Adv Prosthodont. 2021 Oct;13(5):281-291. doi: 10.4047/jap.2021.13.5.281. Epub 2021 Oct 27.
To evaluate the wear of computer-aided design/computer-aided manufacturing (CAD-CAM) dental ceramic materials opposed by enamel as a function of increased chewing forces.
The enamel cusps of healthy human third molar teeth (n = 40) opposed by materials from CAD-CAM dental ceramic groups (n = 10), including Vita Enamic® (ENA), a polymer-infiltrated ceramic network (PICN); GC Cerasmart® (CERA), a resin nanoceramic; Celtra® Duo (DUO), a zirconia-reinforced lithium silicate (ZLS) ceramic; and IPS e.max ZirCAD (ZIR), a polycrystalline zirconia, were exposed to chewing simulation (1,200,000 cycles; 120 N load; 1 Hz frequency; 0.7 mm lateral and 2 mm vertical motion). The wear of both enamel cusps and materials was quantified using a 3D laser scanner, and the wear mechanisms were evaluated by scanning electron microscopy (SEM). The results were analysed using Welch ANOVA and Kruskal Wallis test (α = .05).
ZIR showed lower volume loss (0.02 ± 0.01 mm) than ENA, CERA and DUO ( = .001, = .018 and = .005, respectively). The wear of cusp/DUO [0.59 mm (0.50-1.63 mm)] was higher than cusp/CERA[0.17 mm (0.04-0.41 mm)] ( = .007). ZIR showed completely different wear mechanism in SEM.
Composite structured materials such as PICN and ZLS ceramic exhibit more abrasive effect on opposing enamel due to their loss against wear, compared to uniform structured zirconia. The resin nanoceramic causes the lowest enamel wear thanks to its flexible nano-ceramic microstructure. While zirconia appears to be an enamel-friendly material in wear volume loss, it can cause microstructural defects of enamel.
评估计算机辅助设计/计算机辅助制造(CAD-CAM)牙科陶瓷材料与釉质相对时,随着咀嚼力增加的磨损情况。
选取健康人第三磨牙(n = 40)的釉质尖,与CAD-CAM牙科陶瓷组(n = 10)的材料相对,这些材料包括Vita Enamic®(ENA),一种聚合物渗透陶瓷网络(PICN);GC Cerasmart®(CERA),一种树脂纳米陶瓷;Celtra® Duo(DUO),一种氧化锆增强硅酸锂(ZLS)陶瓷;以及IPS e.max ZirCAD(ZIR),一种多晶氧化锆,使其接受咀嚼模拟(1200000次循环;120 N载荷;1 Hz频率;0.7 mm横向和2 mm垂直运动)。使用3D激光扫描仪对釉质尖和材料的磨损进行量化,并通过扫描电子显微镜(SEM)评估磨损机制。结果采用Welch方差分析和Kruskal Wallis检验进行分析(α = 0.05)。
ZIR的体积损失(0.02±0.01 mm)低于ENA、CERA和DUO(分别为P = 0.001、P = 0.018和P = 0.005)。尖/ DUO的磨损[0.59 mm(0.50 - 1.63 mm)]高于尖/CERA[0.17 mm(0.04 - 0.41 mm)](P = 0.007)。ZIR在SEM中显示出完全不同的磨损机制。
与均匀结构的氧化锆相比,诸如PICN和ZLS陶瓷等复合结构材料由于其耐磨损失,对相对的釉质表现出更大的磨蚀作用。树脂纳米陶瓷因其灵活的纳米陶瓷微观结构导致的釉质磨损最低。虽然氧化锆在磨损体积损失方面似乎是一种对釉质友好的材料,但它会导致釉质的微观结构缺陷。