CERAMIC WHISKER REINFORCEMENT OF DENTAL COMPOSITE RESINS

对牙科汞合金中汞含量的担忧， 使用复合树脂进行后处理。但目前的 复合材料不适用于承受大应力的场合 包括由于过度磨损和断裂而导致的尖瓣。 玻璃填料 在树脂中，由于其 脆性和圆形。陶瓷的初步研究 具有高强度和细长形状的晶须显示出双重的 提高复合材料的强度和韧性， 抛光性，吸水性和强度耐久性，搪瓷磨损和 美学 该项目的目标是i）调查 牙科树脂的晶须增强机制; ii）了解 关键的微观结构和工艺变量， 增强功效;以及iii）开发优化的原型。 到 为实现这些目标，提出以下研究：（1） 晶须尺寸和纵横比的影响将被评估，以改善 增强功效和填料填充;（2）牙科硅酸盐填料 将被融合到单个晶须上，以最大限度地减少晶须 缠结，增强硅烷化，并通过以下方式提高在基质中的保留率 晶须表面粗糙化;（3）晶须含量的影响 将系统地研究复合材料的力学性能 增强机理、透明度、颜色和固化深度;（4） 水老化复合材料的机械和物理性能将 特征，以确定强化机制和关键 微观结构参数，这些知识将被用作反馈 改善微结构设计;（5）三体和双体牙釉质 将对复合材料磨损进行评估，以了解 晶须对磨损机理和磨损率的影响;（6）晶须 复合材料将与传统的复合材料贴面， 晶须增强对最终修复体性能的影响 使用赫兹循环疲劳和弯曲试验进行评估。这 该项目将提供（1）晶须的影响的理解- 玻璃填料混杂和熔融对复合材料性能的影响;（2） 晶须增强牙科树脂的机理;（3）指导原则 晶须增强复合材料的微观结构设计与加工 树脂;和（4）下一代高性能的基础 用于牙科修复和潜在的其他生物医学的复合树脂 应用.

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.