FUSED FIBER NETWORKS FOR TOUGHENED DENTAL COMPOSITES

银汞合金替代材料的开发是一个很高的研究方向 优先考虑与汞有关的环境问题 管理层。牙科复合材料很可能成为替代材料 在可预见的未来的选择。其他替代材料 (例如，陶瓷)过于复杂和昂贵。当前的使用情况 然而，直接放置牙科复合材料在一定程度上是有限的，因为 聚合收缩过大，断裂磨损较差 抵抗。这些特性可能会导致微渗漏 和继发性龋齿的发展，并降低预期寿命 复合修复体在承重应用中的应用。因为. 这些因素，目前的牙科复合材料仅推荐用于 保守的应用程序。使用新型填充物是一种方法 扩大目前可用的牙科应用范围 复合技术。三维“脚手架状”填充物已经被 在有限的研究中对各种牙科材料进行了调查 结果好坏参半。拟议研究的总体目标是 测试“支架状”熔融纤维的加入假设 填充剂会减少牙科复合体的收缩，增加复合体 耐断裂，对复合材料磨损无不良影响 标准牙科复合组合物的耐受性。具体目标 建议研究的目的是：(1)确定添加的效果 预聚合熔融纤维填料颗粒在总体积上的比例 标准牙科复合材料成分的收缩，(2)确定 预聚熔融纤维填料颗粒的添加对其性能的影响 标准牙体的弯曲强度和断裂韧性 复合组合物，(3)确定添加的效果 预聚熔融纤维填充颗粒对体外磨损的影响 标准牙科复合材料组合物的性能，以及(4)确定 断裂韧性和磨损率之间是否存在相关性 改性和未改性的牙科组合物。体积学 收缩将使用比重技术进行测量。骨折 韧性将由受控的缺陷断裂强度决定 裂缝起裂技术及断口评价 瑕疵。将使用改进的林费尔德磨损测试来模拟磨损 仪器，并使用标准轮廓测量技术进行测量。在……里面 此外，还将使用扫描电子显微镜和原子力显微镜对预聚产物进行表征 熔融纤维填料颗粒及其改性复合材料微结构。

The development of amalgam-substitute materials is a high research priority due to environmental concerns associated with mercury management. Dental composites are likely to be the substitute material of choice for the foreseeable future. Other alternative materials (e.g., ceramics) are excessively complex and expensive. Current use of directly placed dental composites is somewhat limited, however, due to excessive polymerization shrinkage and inferior fracture and wear resistance. These characteristics can potentially lead to microleakage and the development of secondary caries, and reduce the life expectancy of composite restorations in load bearing applications. Because of these factors, current dental composites are recommended only for conservative applications. The use of novel fillers is one approach to expand the range of applications for currently available dental composite technology. Three-dimensional "scaffold-like" filler has been investigated in a variety of dental materials in limited studies with mixed results. The overall objective of the proposed research is to test the hypothesis that incorporation of a "scaffold-like" fused-fiber filler will decrease dental composite shrinkage, increase composite fracture resistance, and produce no adverse effects on composite wear resistance of standard dental composite compositions. The specific aims of the proposed research are to: (1) determine the effect of additions of prepolymerized fused-fiber filler particles on the overall volumetric shrinkage of standard dental composite compositions, (2) determine the effect of additions of prepolymerized fused-fiber filler particles on the flexural strength and fracture toughness of standard dental composite compositions, (3) determine the effect of additions of prepolymerized fused-fiber filler particles on the in vitro wear behavior of standard dental composite compositions, and (4) determine if there is any correlation between the fracture toughness and wear rate of modified and unmodified dental composite compositions. Volumetric shrinkage will be measured using specific gravity techniques. Fracture toughness will be determined by a controlled flaw fracture strength technique and through fractographic evaluation of fracture-initiating flaws. Wear will be simulated using a modified Leinfelder wear testing apparatus and measured using standard profilometric techniques. In addition, SEM and AFM will be used to characterize the prepolymerized fused-fiber filler particles and the modified composite microstructures.