Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY 10010, USA; Graduate Program in Dentistry, Positivo University, Curitiba, PR 81280-330, Brazil.
Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, RS 96015-560, Brazil.
Dent Mater. 2019 May;35(5):763-771. doi: 10.1016/j.dental.2019.02.022. Epub 2019 Mar 1.
To investigate the wear behavior of novel graded glass/zirconia materials and their abrasiveness to the antagonist relative to homogeneous zirconias (polished or glazed) and a glass-ceramic.
Graded glass/zirconia specimens were prepared by sintering with concurrent glass-infiltration of pre-sintered zirconia (3Y-TZP) with a polished or as-machined surface. Monolithic zirconia samples were sintered and their surfaces were polished or glazed (as-machined). Glass-ceramic samples were obtained and the surface polished. All specimens were subjected to chewing simulations with a steatite antagonist (r = 3 mm) and a cyclic load of 50 N. Quantitative measurements of wear and roughness were performed on ceramics and antagonists for prescribed number of cycles. Damage sustained in ceramics and antagonists was analyzed by SEM.
The polished zirconia presented little to no variation in wear depth (2 μm) and roughness (0.06 μm). Graded and glazed zirconia experienced a rapid increase in wear depth while the superficial glass layer was present (until 1000 cycles), but showed little variations afterwards - at 450k cycles ∼15 μm for graded and 78 μm for glazed zirconia. The glass-ceramic presented the greatest wear depth (463 μm) and roughness (1.48 μm). Polished zirconia, polished graded zirconia and glazed zirconia yielded significantly lower volumetric wear (∼3 mm) of the antagonist than as-machined graded zirconia and glass-ceramic (∼5 mm).
Polished graded zirconia and polished zirconia presented little wear and roughness, as well as yielded reduced antagonist wear. Glassy materials are both more susceptible to wear and more abrasive to the antagonist relative to zirconia.
研究新型分级玻璃/氧化锆材料的磨损行为及其对同相氧化锆（抛光或上釉）和玻璃陶瓷的抗磨损性。
通过在预烧结氧化锆（3Y-TZP）上进行共烧结玻璃渗透来制备分级玻璃/氧化锆样品，该氧化锆具有抛光或机械加工表面。烧结整体氧化锆样品，并对其表面进行抛光或上釉（机械加工）。获得玻璃陶瓷样品并对其表面进行抛光。所有样品均与滑石拮抗剂（r=3mm）和 50N 的循环载荷进行咀嚼模拟。在规定的循环次数下，对陶瓷和拮抗剂进行磨损和粗糙度的定量测量。通过 SEM 分析陶瓷和拮抗剂中所承受的损伤。
抛光氧化锆的磨损深度（2μm）和粗糙度（0.06μm）几乎没有变化。分级和上釉氧化锆在存在表面玻璃层时经历了磨损深度的快速增加（直到 1000 次循环），但随后变化很小 - 在 450k 次循环时，分级氧化锆约为 15μm，上釉氧化锆约为 78μm。玻璃陶瓷表现出最大的磨损深度（463μm）和粗糙度（1.48μm）。抛光氧化锆、抛光分级氧化锆和上釉氧化锆对拮抗剂的体积磨损（约 3mm）明显低于机械加工分级氧化锆和玻璃陶瓷（约 5mm）。
抛光分级氧化锆和抛光氧化锆的磨损和粗糙度都很小，并且对拮抗剂的磨损也较小。相对于氧化锆而言，玻璃材料更容易磨损且对拮抗剂的磨损更具研磨性。
