牙结构的损失如何影响单根大前的生物力学行为:FEA
Roaa Abdelwahab Abdelfattah1, Nawar Naguib Nawar2, Engy M Kataia2
1Department of Endodontics, Faculty of Dentistry, The British University in Egypt, Misr-Ismalia Road, El Sherouk City, Cairo, 11837, Egypt. dr.roaawahab@gmail.com.
Odontology
|July 2, 2023
概括
冠状牙结构的损失显著影响内牙治疗前牙体的生物力学行为和疲劳寿命,远远超过根管制备. 边缘脊柱对于牙强度至关重要.
科学领域:
- 生物材料科学 生物材料科学
- 牙科生物力学 牙科生物力学
- 在牙科领域的有限元分析.
背景情况:
- 经过内牙治疗的牙需要对结构完整性和疲劳寿命进行评估.
- 大前由于其大小和根管形态,存在独特的解剖学挑战.
- 冠状和根结构的损失可能会损害牙的强度和寿命.
研究的目的:
- 评估冠状和根部牙结构损失如何影响内治疗的前的生物机械行为.
- 用有限元素分析 (FEA) 来确定这些牙在模拟的力下的疲劳寿命.
- 为了比较不同的接入腔设计和根管制备对牙强度的影响.
主要方法:
- 使用有限元素分析 (FEA) 创建了上第二前的完整 (IT) 和缺陷的3D模型.
- 模拟的保守通道腔 (CAC),质封闭 (MO CAC) 和质封闭远端 (MOD CAC) 缺陷.
- 模拟了两个根管制剂 (30/.04和40/.04),并对模型进行了50N周期性闭合负荷.
主要成果:
- 完整的模型表现出最长的疲劳寿命 (1.5 × 10^10周期).
- 使用30/.04制剂的保守通道腔 (CAC) 在接受治疗的牙中显示出最长的存活时间 (1.59 × 10^9周期).
- 使用40/.04制剂的月经封闭远端 (MOD CAC) 缺陷的存活时间最短 (8.35 × 10^7周期).
- 应力分析表明,冠状结构损失显著影响应力大小并增加拉伸应力,比根性准备更重要.
结论:
- 冠状牙结构损失,特别是边缘脊,极大地影响了内治疗的前牙的生物力学行为和疲劳寿命.
- 接入腔的准备对牙的强度和寿命的影响比根性准备更大.
- 保持冠状结构对于维持内牙治疗前牙的功能完整性和寿命至关重要.
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