CERAMIC WHISKER REINFORCEMENT OF DENTAL COMPOSITE RESINS

牙科复合树脂的陶瓷晶须增强材料

• 批准号: 6523847
• 负责人: HUAKUN XU
• 金额: $ 10.84万
• 依托单位: AMERICAN DENTAL ASSOCIATION FOUNDATION
• 依托单位国家: 美国
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-15 至 2004-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6523847
• 关键词: biomaterial evaluation; ceramics; composite resins; dental bonding material; dental material wear; dental materials; glass; oral facial restoration material; silicates; tensile strength

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.

对牙科汞合金中汞的担忧导致需要延长 复合树脂在后部应用中的使用。然而，目前 复合材料不适合承受大应力的应用 由于过度磨损和断裂而涉及尖头。 玻璃填料 在树脂中仅提供有限的增强作用，因为它们 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两倍的 复合材料强度和韧性的提高，并取得了有希望的结果 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) 理解 决定的关键微观结构和加工变量 增强功效； iii) 开发优化原型。 到 为了实现这些目标，建议进行以下研究：（1） 将评估晶须尺寸和长径比的影响以改进 增强功效和填料填充； (2)牙科硅酸盐填料 将融合到各个晶须上以最大限度地减少晶须 缠结，增强硅烷化，并通过以下方式改善在基质中的保留 提供更粗糙的晶须表面； (3)晶须含量的影响 将系统地研究复合材料的力学性能 和增强机制、半透明度、颜色和固化深度； (4) 水老化复合材料的机械和物理性能 确定强化机制和关键 微观结构参数，这些知识将用作反馈 改善微观结构设计； (5)三体、二体搪瓷 将评估对复合材料磨损的影响，以了解 关于磨损机制和磨损率的晶须； (6) 晶须 复合材料将与传统复合材料贴面，效果 晶须加固对最终修复体性能的影响将是 通过赫兹循环疲劳和弯曲测试进行评估。这 项目将提供（1）对晶须影响的理解 玻璃填料杂化和融合对复合材料性能的影响； (2) 牙科树脂晶须增强机制； （三）指导方针 晶须增强复合材料的微观结构设计与加工 树脂； (4) 下一代高性能的基础 用于牙科修复和其他潜在生物医学的复合树脂 应用程序。

项目成果

Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites.

• DOI: 10.1002/jbm.b.30644
• 发表时间: 2007-04
• 期刊: Journal of biomedical materials research. Part B, Applied biomaterials
• 作者: H. Xu;Limin Sun;M. Weir;S. Takagi;L. Chow;B. Hockey

Indentation modulus and hardness of whisker-reinforced heat-cured dental resin composites.

• DOI: 10.1016/s0109-5641(00)00014-2
• 发表时间: 2000-07
• 期刊: Dental materials : official publication of the Academy of Dental Materials
• 作者: H. Xu;D. Smith;G. Schumacher;F. Eichmiller;J. Antonucci

Self-hardening calcium phosphate cement-mesh composite: reinforcement, macropores, and cell response.

• DOI: 10.1002/jbm.a.20124
• 发表时间: 2004-05
• 期刊: Journal of biomedical materials research. Part A
• 作者: H. Xu;C. Simon

Strength and fluoride release characteristics of a calcium fluoride based dental nanocomposite.

• DOI: 10.1016/j.biomaterials.2008.07.037
• 发表时间: 2008-11
• 期刊: Biomaterials
• 影响因子: 14
• 作者: Xu HH;Moreau JL;Sun L;Chow LC
• 通讯作者: Chow LC

Three-body wear of dental resin composites reinforced with silica-fused whiskers.

用硅熔晶须增强牙科树脂复合材料的三体磨损。

• DOI: 10.1016/s0109-5641(03)00096-4
• 发表时间: 2004
• 期刊: Dental materials : official publication of the Academy of Dental Materials
• 作者: Xu,HockinHK;Quinn,JanetB;Giuseppetti,AnthonyA;Eichmiller,FrederickC;Parry,EdwardE;Schumacher,GaryE
• 通讯作者: Schumacher,GaryE