Franklin Paul, Wood David J, Bubb Nigel L
Division of Restorative Dentistry, Leeds Dental Institute, Clarendon Way, Leeds LS2 9LU, UK.
Dent Mater. 2005 Apr;21(4):365-70. doi: 10.1016/j.dental.2004.07.002.
Since the introduction of poly(methyl methacrylate) as a denture base material, it has suffered from having relatively poor mechanical properties. Many methods of improving its strength and toughness have been investigated. Most of these have not been adopted due to: increased cost, the need for specialist processing equipment or increased laboratory time due to more complicated procedures. Glass flake has been used as a reinforcing agent in many industrial polymers, but is as yet untested with denture base acrylic materials. The aim of this study is to evaluate the effect of adding glass flake to denture base acrylic powder on the fracture toughness of the set material.
Glass flake was added in 5, 10 or 20% w/w to Trevalon denture base powder. The material was mixed, flasked, packed and processed in a manner typical for a denture base material. Fracture toughness was determined using a double torsion test technique.
The addition of glass flake gave up to a 69% increase in fracture toughness compared to plain Trevalon material. The addition of 5% glass flake lead to an improvement in fracture toughness that was statistically significant compared to both plain Trevalon and the 10 and 20% groups.
The significant improvement in fracture toughness of a denture base acrylic material using glass flake is an extremely promising result. Other mechanical properties will require testing before glass flake can be recommended as a reinforcing agent for denture base acrylic materials.
自聚甲基丙烯酸甲酯作为义齿基托材料引入以来，其机械性能相对较差。人们研究了许多改善其强度和韧性的方法。但由于成本增加、需要专业加工设备或因程序更复杂导致实验室时间增加，这些方法大多未被采用。玻璃鳞片已在许多工业聚合物中用作增强剂，但尚未在义齿基托丙烯酸材料中进行测试。本研究的目的是评估向义齿基托丙烯酸粉末中添加玻璃鳞片对固化材料断裂韧性的影响。
将玻璃鳞片按5%、10%或20%（重量/重量）添加到Trevalon义齿基托粉末中。材料以义齿基托材料的典型方式进行混合、装盒、填充和加工。使用双扭试验技术测定断裂韧性。
与普通Trevalon材料相比，添加玻璃鳞片使断裂韧性提高了69%。添加5%玻璃鳞片导致断裂韧性提高，与普通Trevalon材料以及10%和20%组相比具有统计学意义。
使用玻璃鳞片使义齿基托丙烯酸材料的断裂韧性显著提高是一个非常有前景的结果。在推荐玻璃鳞片作为义齿基托丙烯酸材料的增强剂之前，还需要测试其他机械性能。
