临时冠的抗折性:半永久性树脂的有限元分析——一项初步研究

Fracture Resistance of Provisional Crowns: A Finite Element Analysis of a Semi-Permanent Resin-A Pilot Study.

作者信息

Kamel Nadine, Habre Pascale

机构信息

Department of Prosthodontics, Faculty of Dental Medicine, Saint Joseph University of Beirut, Beirut 1107 2180, Lebanon.

出版信息

Dent J (Basel). 2025 Mar 24;13(4):137. doi: 10.3390/dj13040137.

Abstract

: Fracture resistance is crucial for provisional crowns, especially under high-stress conditions like bruxism. While semi-permanent materials such as Luxacrown are designed for durability, their performance under extreme occlusal forces remains uncertain. This study uses finite element analysis (FEA) to evaluate the fracture resistance of five common provisional crown materials. : A standardized digital model of a maxillary first molar was developed with uniform crown thickness. Twenty models were created to assess Unifast Trad (self-curing PMMA), Luxatemp Star (bis-acryl composite), Luxacrown (semi-permanent bis-acryl), Protemp 4 (nanofilled bis-acryl), and Telio CAD (CAD/CAM PMMA). FEA simulations evaluated vertical (250 N), lateral (225 N), diagonal (400 N), and bruxism-level (800 N) forces. Stress-to-strength ratios (SSR) and Von Mises stress distributions were analyzed to evaluate material performance and failure risk. : Telio CAD exhibited the highest fracture resistance, maintaining SSR values below 100% across scenarios. Luxacrown and Protemp 4 performed adequately under moderate loads but showed increased stress concentrations under bruxism-level forces. Luxatemp Star followed a similar trend, whereas Unifast Trad demonstrated the lowest resistance, accumulating significant stress in all conditions. : Material selection is key to provisional crown fracture resistance. Telio CAD showed the highest durability, while Luxacrown and Protemp 4 performed well under moderate loads but struggled under extreme forces, raising concerns about semi-permanent materials. Luxatemp Star showed similar trends, and Unifast Trad, the weakest, is best for short-term use.

摘要

抗折性对于临时冠至关重要,尤其是在磨牙症等高应力条件下。虽然像Luxacrown这样的半永久性材料设计用于耐用性,但其在极端咬合力下的性能仍不确定。本研究使用有限元分析(FEA)来评估五种常见临时冠材料的抗折性。

开发了一个具有均匀冠厚度的上颌第一磨牙标准化数字模型。创建了20个模型来评估Unifast Trad(自凝PMMA)、Luxatemp Star(双丙烯酸酯复合材料)、Luxacrown(半永久性双丙烯酸酯)、Protemp 4(纳米填充双丙烯酸酯)和Telio CAD(CAD/CAM PMMA)。FEA模拟评估了垂直(250 N)、侧向(225 N)、对角(400 N)和磨牙症水平(800 N)的力。分析应力与强度比(SSR)和冯·米塞斯应力分布以评估材料性能和失效风险。

Telio CAD表现出最高的抗折性,在所有情况下SSR值均保持在100%以下。Luxacrown和Protemp 4在中等负荷下表现良好,但在磨牙症水平的力作用下应力集中增加。Luxatemp Star呈现类似趋势,而Unifast Trad表现出最低的抗性,在所有条件下都积累了显著的应力。

材料选择是临时冠抗折性的关键。Telio CAD显示出最高的耐用性,而Luxacrown和Protemp 4在中等负荷下表现良好,但在极端力作用下表现不佳,这引发了对半永久性材料的担忧。Luxatemp Star呈现类似趋势,而最脆弱的Unifast Trad最适合短期使用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c079/12026018/cd2573a62d35/dentistry-13-00137-g001.jpg

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