Department of Fixed Prostheses and Implants Prosthodontics, School of Dentistry, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Macedonia, Greece.
Dent Mater J. 2011;30(2):222-31. doi: 10.4012/dmj.2010-135. Epub 2011 Mar 4.
The aim of this study was to investigate the possible reinforcement of Nanodiamonds (ND) in a PMMA resin for fixed interim restorations. The fracture toughness (K(Ic)), impact strength and the dynamic thermomechanical properties (T(g), E´, E´´, tanδ) of a series of PMMA-ND nanocomposites with different amounts of ND were evaluated. The fracture toughness increased as the ND percentage increased up to 0.38% wt but a greater amount of ND induced a decrease in K(Ic). Impact strength and Young's modulus were also increased by increasing nanoparticles content, indicating the reinforcing effect of ND. Dynamic mechanical properties were also affected. By increasing the ND content an increase of storage modulus was recorded, while glass transition was shifted at higher temperatures. Under the limitations of this study, it can be suggested that reinforcing PMMA with ND nanoparticles -especially at low concentrations- may increase the overall performance of fixed interim prostheses.
本研究旨在探讨纳米金刚石（ND）在用于固定临时修复的 PMMA 树脂中的增强作用。评估了一系列具有不同 ND 含量的 PMMA-ND 纳米复合材料的断裂韧性（K（Ic））、冲击强度和动态热机械性能（T（g）、E´、E´´、tanδ）。随着 ND 百分比的增加，断裂韧性增加，最高可达 0.38%wt，但 ND 含量的增加会导致 K（Ic）降低。随着纳米粒子含量的增加，冲击强度和杨氏模量也增加，表明 ND 具有增强作用。动态机械性能也受到影响。随着 ND 含量的增加，存储模量增加，而玻璃化转变温度升高。在本研究的限制内，可以认为用 ND 纳米粒子增强 PMMA-尤其是在低浓度下-可能会提高固定临时修复体的整体性能。
