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用不同树脂复合材料复制的III类粘合剂中内部和边缘收缩应力的评估 - - 3D-FEA研究

Elisa Donaria Aboucauch Grassi¹, Guilherme Schmitt de Andrade², Ana Beatriz Gomes de Carvalho¹

¹Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), 777th Eng. Francisco José Longo Av., São José dos Campos 12245-000, SP, Brazil.

Dentistry journal

|August 27, 2025

概括

不同的牙复合技术会影响缩压力. 可流动的散装填充基 (FB) 显示较低的边缘应力,但较高的内部牙应力,这表明III类修复中的潜在长期债券问题.

科学领域:

牙科材料科学
生物材料工程
计算机牙科

背景情况:

树脂复合材料中的聚合收缩应力可能导致边缘隙和二次.
由于其位置和应力分布模式,III类修复具有独特的挑战.
了解恢复技术对压力发展的影响对于长期恢复成功至关重要.

研究的目的:

研究不同树脂复合材料修复技术对聚合收缩应力的影响及其在III类牙科修复中的分布.
通过数值有限元分析 (FEA) 对各种复合物分层策略进行比较.

主要方法:

创建了一个带有III类远腔的人类半顶的3D有限元素分析 (FEA) 模型.
模拟了四个修复组:常规复合增量,散装复合增量,常规复合的可流动复合基和常规复合的可流动散装基.
进行了静态结构分析,使用热类比模拟聚合收缩,并通过最大主应力标准分析应力分布.

主要成果:

可流量填充基 (FB) 组表现出最低的近接应力 (4.48 MPa),但最大的内部牙应力.
常规复合材料 (FC) 组的流动基体显示出最高的近距离应力 (9.05 MPa).
在所有组中,在宫腔表面的角度观察到应力度,差异很小.

结论:

在III类复合修复中,修复技术没有显著改变边际应力分布.
宫边缘的形区域是聚合缩小应力度的关键区域.
虽然FB技术减少了边际应力,但可能会对牙结合的长期完整性造成风险.

关键词:

第三类牙科修复复合树脂牙科材料牙修复有限元素分析聚合缩小

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