Fracture Resistance and Failure Mode Analysis of Biomimetic Overlays Constructed from Different Machinable Blocks and Subjected to Thermo-Dynamic Aging. An In Vitro Study

Egyptian dental journal Pub Date : 2024-07-01 DOI:10.21608/edj.2024.292091.3051

Hanaa S. Nassar, M. Eliwa

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Abstract

Purpose: To evaluate the fracture resistance and failure modes of biomimetic adhesive overlays constructed from two different types of machinable blocks after thermodynamic aging. Materials and methods: Twenty-two sound maxillary premolars were prepared for adhesive overlays and randomly allocated into two groups (n=11) according to the material used for overlay construction: Group CT: advanced lithium disilicate with virgilite (CEREC Tessera), and Group BC: ceramic reinforced composite (Brilliant Crios) materials. Thermodynamic aging was done to all bonded samples followed by fracture resistance test. Modes of failure were evaluated with digital microscope at 10X magnification. Results: Group CT recorded higher fracture mean values (1065.4 ±79.3) than group BC mean values (930.4 ±41.2). Failure mode distribution scores between the two material groups were statistically non-significant. Conclusions: CEREC Tessera showed better fracture resistance than Brilliant Crios. Both materials showed similar percentages of catastrophic failure. The majority of samples in both groups exhibited repairable fractures.

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由不同可加工块体构建并经过热动态老化的仿生覆盖层的抗断裂性和失效模式分析。体外研究

目的：评估由两种不同类型的可加工砌块构建的仿生物粘合剂覆盖层在热力学老化后的抗断裂性和失效模式。材料和方法：制备22颗完好的上颌前磨牙用于粘接覆盖，并根据覆盖材料的不同随机分为两组（n=11）：CT组：高级二硅酸锂与virgilite（CEREC Tessera），BC组：陶瓷增强复合材料（Brilliant Crios）。对所有粘合样品进行热力学老化，然后进行抗断裂测试。用放大 10 倍的数码显微镜对破坏模式进行评估。结果：CT 组的断裂平均值（1065.4 ±79.3）高于 BC 组的断裂平均值（930.4 ±41.2）。两组材料的失效模式分布得分在统计学上无显著差异。结论：CEREC Tessera 的抗断裂性比 Brilliant Crios 好。两种材料发生灾难性破坏的比例相似。两组中的大多数样品都出现了可修复的断裂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Egyptian dental journal

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