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首页> 外文学位 >Synthesis, characterization, and evaluation of star-shaped poly(acrylic acid)s as well as nanoparticles constructed glass-ionomer cements for improved dental restoratives.
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Synthesis, characterization, and evaluation of star-shaped poly(acrylic acid)s as well as nanoparticles constructed glass-ionomer cements for improved dental restoratives.

机译：星形聚丙烯酸和纳米粒子构成的玻璃离聚物粘固剂的合成，表征和评估，用于改善牙齿修复剂。

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摘要

Glass-ionomer cement (GIC) is a promising dental restorative material with numerous advantages. However, its inferior mechanical performances have limited its application to low-stress bearing sites. In this dissertation, we successfully improved the mechanical performance and wear resistance of glass-ionomer cement using two strategies: (1) modification on polymer matrix by using star-shaped poly(acrylic acid)s; and (2) modification of glass filler by using surface modified OX50 (SiO2) nanoparticles. Star-shaped poly(acrylic acid)s were synthesized using atom transfer radical polymerization (ATRP) reaction and then formulated into glass-ionomer cement. The resultant GIC showed significantly better mechanical performances and wear resistance than commercial GICs. It also exhibited significantly better biocompatibility. The fluoride release was maintained in the cements of star-shaped polymers, while the curing shrinkage was limited to a low level. Surface modification of OX50 nanoparticles was performed via surface-initiated ATRP reaction. OX50 surfaced modified with poly(acrylic acid) significantly improved the mixing property. Although little improvement in mechanical strength was found; a significant improvement in attritional wear resistance was observed for all the cements containing surface modified nanoparticles. In general, both strategies have proved effective to improve the mechanical performances and wear resistance of GIC.
机译：玻璃离聚物水泥（GIC）是具有许多优点的有前途的牙科修复材料。然而，其较差的机械性能限制了其在低应力轴承部位的应用。本文通过两种策略成功提高了玻璃离聚物水泥的力学性能和耐磨性：（1）通过星形聚丙烯酸改性聚合物基体； （2）通过使用表面改性的OX50（SiO2）纳米颗粒对玻璃填料进行改性。利用原子转移自由基聚合（ATRP）反应合成星形聚丙烯酸，然后配制成玻璃离聚物水泥。所得的GIC显示出比商业GIC更好的机械性能和耐磨性。它也表现出明显更好的生物相容性。星形聚合物胶泥中的氟化物释放得以保持，而固化收缩率则被限制在较低水平。 OX50纳米颗粒的表面改性是通过表面引发的ATRP反应进行的。用聚丙烯酸改性的OX50表面显着改善了混合性能。尽管发现机械强度几乎没有改善；对于所有包含表面改性的纳米粒子的水泥，观察到耐磨耗性的显着改善。总的来说，两种策略都被证明可以有效改善GIC的机械性能和耐磨性。

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  • 作者

    Zhao, Jun.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Engineering Biomedical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 151 p.
  • 总页数 151
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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