用单层或多层技术用散装或常规复合材料制成的II类体外修复的边际调整
Didier Dietschi1, Mustafa Askari1, Isaline Rossier1
1Division of Cariology and Endodontology, Section of Dental Medicine, Faculty of Medicine, University of Geneva, 1205 Geneva, Switzerland.
Materials (Basel, Switzerland)
|September 28, 2023
概括
在研究直接复合材料填充的修复材料和技术时,这项研究发现,热力学负荷随着时间的推移显著降低了边际适应. 虽然在牙边缘没有发现差异,但使用多层技术的高模量材料显示出更好的牙边缘适应性.
科学领域:
- 牙科材料科学 牙科材料科学
- 恢复性牙科 恢复性牙科
- 生物材料工程 生物材料工程
背景情况:
- 直接复合材料修复广泛用于大型II类空洞.
- 边际完整性对于恢复寿命和预防二次牙至关重要.
- 膜下边缘在实现和维持适应方面存在独特的挑战.
研究的目的:
- 评估不同修复材料 (传统与散装复合材料) 和分层技术 (单层与多层) 对第二类直接复合材料修复的边际适应的影响.
- 评估热力学负荷 (TML) 对具有上和下边缘的修复的边际完整性的影响.
- 为了比较疲劳条件下的牙和牙中发生的边缘缺陷类型 (凝聚性与接口性).
主要方法:
- 40个准备好的牙被分为五组,使用各种常规和散装复合材料,具有不同的分层策略.
- 标本经历了分阶段的热力学负荷 (TML),模拟了口内条件.
- 使用扫描电子显微镜 (SEM) 在多个时间点 (T0,T1,T2,T3) 量化评估牙和牙边缘的边际适应.
主要成果:
- 在所有组中,TML显著降低了连续边际适应,其百分比从基线75.291.8%下降到疲劳后的21.373.9%.
- 复合系统和分层协议都显著影响了边际适应,观察到时间依赖的效应.
- 乳边缘缺陷主要是凝聚性 (微型骨折),而牙缺陷主要是界面间隙.
结论:
- 长期的体外疲劳测试显示,直接复合材料修复的边缘适应性显著降低,即使使用高粘度的常规材料和正确的子腔腔层层.
- 在测试组之间,在宫牙边缘没有发现适应的显著差异.
- 通过使用多层技术应用更高模量材料,观察到更好地适应质边缘的趋势.
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