长时间加热方案对树脂复合材料的物理机械性能的影响
Quintessence international (Berlin, Germany : 1985)
|April 16, 2025
概括
长时间加热不会影响树脂复合材料的屈曲强度. 然而,表面硬度受树脂类型和加热时间的影响,一些材料在长时间暴露于热量后硬度降低.
科学领域:
- 牙科材料科学 牙科材料科学
- 聚合物化学 聚合物化学
- 生物材料工程 生物材料工程
背景情况:
- 树脂复合材料在恢复性牙科中广泛使用.
- 了解它们在热应力下的长期行为对于临床寿命至关重要.
- 之前的研究已经探索了各种老化方法,但长时间的加热效应需要进一步研究.
研究的目的:
- 评估三种树脂复合材料的物理机械性能.
- 评估不同长期加热方案对屈曲强度和Knoop微硬度的影响.
- 为了比较Filtek Supreme,Viscalor和Grandioso在热老化的性能.
主要方法:
- 测试了三种树脂复合材料的150个标本.
- 组受室温,长时间加热 (24h/68°C,7d/68°C) 和热循环 (30和100个循环) 的影响.
- 屈曲强度和Knoop微硬度被测量为响应变量.
主要成果:
- 在所有测试的树脂中,柔性强度不受加热协议的影响.
- 与Filtek Supreme和Viscalor相比,Grandioso表现出更高的屈曲强度.
- 诺普的微硬度差异很大;Grandioso显示了最高的硬度,而Filtek Supreme的硬度在100个热循环后下降. 长时间加热降低了Grandioso和Viscalor的硬度.
结论:
- 树脂复合材料的柔性强度能够抵御长时间加热.
- 表面硬度受到树脂成分和热暴露时间的显著影响.
- 临床影响表明,根据预期的热挑战,仔细选择材料.
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