用于牙科修复体的氧化锆增韧氟硅酸盐微晶玻璃
Zirconia toughened fluorosilicate glass-ceramics for dental prosthetic restorations.
作者信息
Gali Sivaranjani, Arjun Akshay, Premkumar H B
机构信息
Department of Prosthodontics and Crown & Bridge, Faculty of Dental Sciences, M.S.Ramaiah University of Applied Sciences, Bangalore, 560054, India.
Department of Physics, Faculty of Mathematical and Physical Sciences, M.S Ramaiah University of Applied Sciences, Bengaluru, 560 058, India.
出版信息
Mater Chem Phys. 2024 Sep;324:129703. doi: 10.1016/j.matchemphys.2024.129703.
BACKGROUND
Dental glass-ceramics have limited strength and are unsuitable for high-stress-bearing areas. Zirconia stands out as a popular choice for reinforcing dental glass-ceramics due to its biocompatibility and high fracture toughness.
OBJECTIVES
The objective of the study is to investigate the effect of an increase in zirconia (25, 30, 35 and 50 wt%) on microstructure, chemical solubility, hardness, fracture toughness, and brittleness index of fluorosilicate glass systems for dental restorative applications.
MATERIAL AND METHODS
The fluorosilicate glass frit was obtained through the melt-quench technique. The glass frit was ball-milled with 25, 30, 35 and 50 wt % of 3 mol% yttria-stabilized zirconia (G-25Z, G-30Z, G-35Z, and G-50Z). The composites were sintered to 1000 °C for 48h at a heating rate of 5 °C/min. The glass frit was subject to differential scanning calorimetry. Phase analysis and microstructural characterization were carried out. The crystallite size of zirconia and glass-ceramics, micro-hardness, indentation fracture toughness, brittleness index, and chemical solubility were evaluated.
RESULTS
Phase analysis reveals tetragonal and monoclinic zirconia with minor peaks of forsterite, fluorphlogopite, norbergite, and spinel. Their microstructures reveal the characteristic house-of-cards arrangement of fluorophlogopite crystals with dispersed zirconia. The results of hardness and fracture toughness show a statistically significant improvement with an increase in zirconia content. The crystallite size of zirconia and fluorophlogopite crystals with aspect ratio, brittleness index, and chemical solubility declined as the zirconia content increased.
CONCLUSIONS
Increase in zirconia content from 25 wt % to 50 wt % in heat-treated fluorosilicate glass systems reveals non-reactive zirconia with a stable glass matrix and limits the growth of fluorphlogopite crystals with a house-of-cards microstructure. This results in a range of properties suitable for dental restorations of enhanced hardness, and improved fracture toughness. Despite these improvements, the material maintains its machinability with reduced chemical solubility.
背景
牙科玻璃陶瓷强度有限，不适用于高应力承载区域。氧化锆因其生物相容性和高断裂韧性，成为增强牙科玻璃陶瓷的热门选择。
目的
本研究旨在探讨增加氧化锆（25%、30%、35%和50%重量比）对用于牙科修复应用的氟硅酸盐玻璃系统的微观结构、化学溶解度、硬度、断裂韧性和脆性指数的影响。
材料与方法
通过熔融淬火技术获得氟硅酸盐玻璃料。将玻璃料与25%、30%、35%和50%重量比的3摩尔%氧化钇稳定氧化锆（G - 25Z、G - 30Z、G - 35Z和G - 50Z）进行球磨。将复合材料以5℃/分钟的加热速率烧结至1000℃，保温48小时。对玻璃料进行差示扫描量热法分析。进行相分析和微观结构表征。评估氧化锆和玻璃陶瓷的微晶尺寸、显微硬度、压痕断裂韧性、脆性指数和化学溶解度。
结果
相分析显示四方相和单斜相氧化锆，伴有少量镁橄榄石、氟金云母、硅镁石和尖晶石的峰。它们的微观结构显示出氟金云母晶体与分散的氧化锆形成特征性的纸牌屋排列。硬度和断裂韧性结果表明，随着氧化锆含量的增加有统计学显著改善。氧化锆和氟金云母晶体的微晶尺寸、长径比、脆性指数和化学溶解度随着氧化锆含量的增加而下降。
结论
在热处理的氟硅酸盐玻璃系统中，氧化锆含量从25%重量比增加到50%重量比，显示出与稳定玻璃基体不发生反应的氧化锆，并限制了具有纸牌屋微观结构的氟金云母晶体的生长。这导致一系列适合牙科修复的性能，硬度增强，断裂韧性提高。尽管有这些改进，该材料仍保持其可加工性，化学溶解度降低。
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