Fracture Resistance in Fibre-Reinforced Resin Composite Restorations in Deciduous and Permanent Molars: An Ex Vivo Study

IF 1.7 Q3 DENTISTRY, ORAL SURGERY & MEDICINE Saudi Dental Journal Pub Date : 2024-06-12 DOI:10.1016/j.sdentj.2024.06.017

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引用次数: 0

Abstract

Aim

The aim of this study was to compare the fracture resistance levels of restored deciduous teeth and permanent molars restored with different materials, including ultra-polyethylene fibre tape (Ribbond-Ultra), fibre-reinforced resin composite EverX posterior, fibre-reinforced flowable resin composite EverX Flow and bulk-fill flow restorative material (Tetric N-flow) in the posterior region.

Methods

We tested sixty-four caries-free human mandibular molars (32 deciduous molars and 32 permanent molars). Deep and wide Class I cavities were prepared in each tooth. The teeth were embedded in poly(methyl methacrylate) resin up to the cementoenamel junction, leaving the crown completely exposed. Oral temperature fluctuations were then simulated using two thousand thermocycling cycles, each lasting 30 seconds in the hot phase (approximately 35 °C). The loading rate for our force-fracture tests was set at 0.5 mm/min. Direct restorations were made using a spherical tip and applying the force perpendicular to the sample surface. Visual inspection of the fractured specimens, in combination with adhesive scanning electron microscopy (SEM) and finite element analysis (FEA), provided detailed insights into the failure modes and stress distribution at the restoration–tooth interface.

Results

Teeth restored with fibre-reinforced composite (EverX Posterior) had the highest fracture resistance, followed by fibre-reinforced flowable resin composite (EverX Flow). Teeth restored with the ultra- polyethylene fibre tape (Ribbond-Ultra), followed by the flowable bulk-fill composite (Tetric N-flow) had the lowest resistance. Statistical analysis revealed significant differences between the groups, except for EverX Posterior and EverX Flow. A predictive algorithm was also proposed for the likelihood of restoration failure.

Conclusion

Modern fibre-reinforced resin composites, such as EverX Posterior, effectively reinforce teeth against fractures, with success in both restored deciduous and permanent molars. Meanwhile, the use of polyethylene fibre tapes is less effective, and they involve a time-consuming application.

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纤维增强树脂复合修复体在落牙和恒磨牙中的抗折性：体外研究

本研究的目的是比较使用不同材料（包括超聚乙烯纤维带（Ribbond-Ultra）、纤维增强型树脂复合材料 EverX 后牙、纤维增强型流动树脂复合材料 EverX Flow 和后牙区域的大量填充流动修复材料（Tetric N-flow））修复的乳牙和恒磨牙的抗折性水平。在每颗牙齿上都制备了深而宽的 I 级龋洞。将牙齿嵌入聚甲基丙烯酸甲酯树脂中，直至牙本质釉质交界处，使牙冠完全暴露。然后使用两千个热循环周期模拟口腔温度波动，每个热循环周期持续 30 秒（约 35 °C）。力-断裂测试的加载速度设定为 0.5 毫米/分钟。使用球形针尖进行直接修复，施加的力垂直于试样表面。通过对断裂试样进行目视检查，并结合粘接扫描电子显微镜（SEM）和有限元分析（FEA），可以详细了解修复体与牙齿界面的断裂模式和应力分布情况。结果使用纤维增强复合材料（EverX Posterior）修复的牙齿具有最高的抗断裂性，其次是纤维增强可流动树脂复合材料（EverX Flow）。用超聚乙烯纤维带（Ribbond-Ultra）修复的牙齿抗折性最低，其次是可流动的散装填充复合材料（Tetric N-flow）。统计分析显示，除 EverX Posterior 和 EverX Flow 外，各组之间存在明显差异。结论EverX Posterior 等现代纤维增强树脂复合材料能有效加固牙齿，防止牙齿断裂，在修复乳磨牙和恒磨牙方面都取得了成功。与此同时，使用聚乙烯纤维带的效果较差，而且使用起来比较费时。

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来源期刊

Saudi Dental Journal DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

22 weeks

期刊介绍： Saudi Dental Journal is an English language, peer-reviewed scholarly publication in the area of dentistry. Saudi Dental Journal publishes original research and reviews on, but not limited to: • dental disease • clinical trials • dental equipment • new and experimental techniques • epidemiology and oral health • restorative dentistry • periodontology • endodontology • prosthodontics • paediatric dentistry • orthodontics and dental education Saudi Dental Journal is the official publication of the Saudi Dental Society and is published by King Saud University in collaboration with Elsevier and is edited by an international group of eminent researchers.