THERMOPLASTIC RESIN MATRIX DENTAL COMPOSITES

在固定修复中， 生物相容性、耐磨损和耐疲劳的材料， 坚韧，坚固，可以很容易地加工成薄层和复杂 形状用于镶牙和修复大部分的大缺陷， 就像铸造黄金一样。金属陶瓷、陶瓷和热固性塑料 复合材料的使用频率越来越高，以满足 审美要求，铸造金属不再单独可以。 金属陶瓷已成为治疗的选择， 覆盖修复广泛破坏的前后牙 牙齿.虽然金属陶瓷的临床寿命较好，但主要 这些改进的缺点被认为是增加了 牙齿减少，这是需要实现往往只有足够的 美学牙科陶瓷具有出色的化学耐久性， 稳定性、光学和生物相容性， 提高牙科修复体的美学质量。原则 然而，所有陶瓷材料的缺点是它们不能变形 无骨折。热固性树脂基复合材料用于 一些临床医生提倡间接修复程序， 这些材料在高应力下光学稳定性和性能 承载区，如后咬合面和前切缘 边缘仍然可疑。高性能修复材料， 陶瓷的光学稳定性和金属的临床寿命， 金属陶瓷是本研究的长期目标。 目前牙科复合材料的热固性树脂基体已经被 被认为是导致临床表现不佳的原因 材料的颜色稳定性、耐磨性和韧性。 热塑性树脂基复合材料是一种较新的艺术类材料 并已被用于许多高性能 结构应用通常作为金属、陶瓷和 热固性复合材料。具有改进的水和热塑性聚合物 耐化学性，耐磨性和韧性已被选定为 作为颗粒增强复合材料的基体相进行评价。那里 很明显，缺乏信息来评估 为以下情况承担 该建议旨在评估四种颗粒增强 可能用作间接加热器的热塑性树脂基复合材料 修复材料。商业复合材料（Herculite XR，Kerr）将 作为对照，填充物类型将保持不变， 材料.耐磨性、疲劳性和断裂韧性将是 主要的比较措施和矩阵属性的影响 将评估综合性能。

There is a clinical need in fixed prosthodontics for indirect esthetic materials that are biologically compatible, wear and fatigue resistant, tough, strong, and can be easily processed into thin layers and complex shapes for use in veneering teeth and restoring large defects in much the same manner as cast gold. Metal-ceramics, ceramics and thermoset based composites are all being used with increased frequency to satisfy the esthetic demands that cast metal alone no longer can. Metal-ceramics have become the treatment of choice for the complete coverage restoration of extensively broken down anterior and posterior teeth. While the clinical longevity of metal-ceramic is good, the major drawbacks of these restorations is considered to be the increased amount of tooth reduction which is required to achieve often only adequate esthetics. Dental ceramics have outstanding chemical durability and stability, optical and biologic compatibility and have done much to improve the esthetic quality of dental restorations. The principle drawback of all ceramic materials, however, is their inability to deform without fracture. The use of thermoset resin matrix composites for indirect restorative procedures has been advocated by some clinicians but the optical stability and performance of these materials in high stress bearing areas such as posterior occlusal surfaces and anterior incisal edges remains suspect. High performance restorative materials with the optical stability of ceramic and the clinical longevity of metals and metal-ceramics are the long range goals of this study. The thermoset resin matrix of current dental composites has been implicated as being contributory to the poor clinical performance of the material with respect to color stability, wear resistance and toughness. Thermoplastic resin matrix composite materials art a relatively new class of materials and have been used for a number of high performance structural applications often as a substitute for metals, ceramics and thermoset composites. Thermoplastic polymers with improved water and chemical resistance, wear resistance and toughness have been selected for evaluation as the matrix phase of particulate reinforced composites. There is clearly a lack of information available to assess the performance of such materials. This proposal is designed to evaluate four particulate reinforced thermoplastic resin matrix composites for potential use as indirect restorative materials. A commercial composite (Herculite XR, Kerr) will act as the control and the filler type will remain constant for all materials. Wear resistance, fatigue and fracture toughness will be the principal comparative measures and the effect of matrix properties on the composite performance will be assessed.