CERAMIC WHISKER REINFORCEMENT OF DENTAL COMPOSITE RESINS

对牙科汞齐中汞的担忧促使人们有必要延长 使用复合树脂进行后路应用。但是，当前 复合材料不适合大型承压应用。 由于过度磨损和骨折而涉及尖端。玻璃填充物 在树脂中只能提供有限的增强，因为它们 脆性大，形状圆润。陶瓷学的初步研究 具有高强度和拉长形状的晶须显示出两个折叠 复合材料强度和韧性的提高，并在以下方面取得了良好的结果 抛光性、吸水性和强度耐久性、釉质耐磨性和 美学。这个项目的目标是：i)调查 牙科树脂的晶须强化机制；ii)了解 关键的微观结构和加工变量决定了 增强功效；以及iii)开发优化的原型。至 为了实现这些目标，提出了以下研究：(1) 将评估晶须大小和纵横比的影响以改进 增强效果和填料填充；(2)口腔硅酸盐填料 将被融合到单个胡须上，以最大限度地减少胡须 缠结，增强硅烷化，并改善基质中的保留率 提供更粗糙的晶须表面；(3)晶须含量的影响 将对复合材料的力学性能进行系统的研究 增强机理、半透明性、固化颜色和固化深度； 水老化复合材料的力学和物理性能将 以识别增强机制和关键为特征 微结构参数，这些知识将被用作反馈 改善微观结构设计；(5)三体和二体釉质 将对抗复合磨损进行评估，以了解 晶须对磨损机理和磨损率的影响；以及(6)晶须 将复合材料贴面与常规复合材料贴面的效果 晶须增强对最终修复体性能的影响 采用赫兹循环疲劳和弯曲试验进行评价。这 该项目将提供(1)对胡须的影响的了解- 玻璃填料杂化与熔融对复合材料性能的影响 牙科树脂的晶须强化机理。(3)指南 晶须增强复合材料的微观结构设计与加工 树脂；以及(4)下一代高性能的基础 用于牙科修复和潜在其他生物医学的复合树脂 申请。

Concerns about mercury in dental amalgam have created a need to extend the use of composite resins to posterior applications. However, current composites are not suitable for large stress-bearing applications involving cusps due to excessive wear and fracture. The glass fillers in resins provide only limited reinforcement because of their brittleness and rounded shapes. Preliminary studies with ceramic whiskers having high strength and elongated shapes showed a two-fold increase in composite strength and toughness, and promising results on polishability, water absorption and strength durability, enamel wear and esthetics. The goals of this project are to i) to investigate the whisker reinforcement mechanisms for dental resins; ii) to understand the key microstructural and processing variables that determine reinforcing efficacy; and iii) to develop optimized prototypes. To accomplish these goals, the following studies are proposed: (1) the effects of whisker size and aspect ratio will be evaluated to improve reinforcing efficacy and filler packing; (2) dental silicate fillers will be fused onto the individual whiskers to minimize whisker entanglement, enhance silanization, and improve retention in matrix by providing rougher whisker surfaces; (3) the effect of whisker content will be systematically investigated on composite mechanical properties and reinforcing mechanisms, translucency, color and depth of cure; (4) the mechanical and physical properties of water-aged composites will be characterized to identify the reinforcing mechanisms and the key microstructural parameters, and this knowledge will be used as feedback to improve microstructural design; (5) three- and two-body enamel against composite wear will be evaluated to understand the effect of whiskers on wear mechanisms and wear rates; and (6) the whisker composite will be veneered with conventional composites and the effect of whisker reinforcement on properties of the final restoration will be evaluated by using Hertzian cyclic fatigue and flexural tests. This project will provide (1) an understanding of the effects of whisker- glass filler hybridization and fusion on composite properties; (2) mechanisms of whisker reinforcement for dental resins; (3) guidelines on microstructural design and processing of whisker-reinforced composite resins; and (4) a basis for the next generation of high performance composite resins for dental restorative and potentially other biomedical applications.