Effect of thermomechanical aging on fracture strength of anterior crowns fabricated with different CAD-CAM materials.

IF 2.7 3区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Advanced Prosthodontics Pub Date : 2025-06-01 Epub Date: 2025-06-25 DOI:10.4047/jap.2025.17.3.158

Mine Helvacıoğlu Özkardeş, Hatice Banu Özel, Erkut Kahramanoğlu

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引用次数: 0

Abstract

Purpose: The purpose of this study was to assess the effect of thermomechanical aging on fracture strength of CAD/CAM (computer aided design and computer aided manufacturing) anterior crowns.

Materials and methods: A resin maxillary central incisor was prepared and 96 epoxy resin replicas were obtained. Anterior crowns were produced and divided into four groups: IPS (IPS e.max CAD, 1.5 mmthickness), CD (Celtra Duo, 1.5 mm thickness), GC (GC Initial UHT, 1.5 mm thickness) and GC1 (GC Initial UHT, 1 mm thickness). Twelve crowns of each group were subjected to a chewing simulator for 240,000 cycles, and the other 12 crowns were regarded as control. Fracture resistance of aged and non-aged crowns were tested using a universal testing machine (Shimadzu AGS-X). One-way ANOVA, Tukey post hoc and independent sample t-tests were used to analyze the data and a P value < .05 was considered significant.

Results: IPS crowns without aging had the highest (2094.3 ± 399.31 N), and the GC1 crowns after aging had the lowest (1216.99 ± 302.96 N) fracture strength values. The difference of fracture strength among the same thickness samples without aging was not statistically significant (P > .05). The fracture strength of the GC1 group was significantly lower than those of the other groups (P < .05). After aging; GC group showed significantly higher fracture strength than the IPS and GC1 groups. The CD group's fracture strength was significantly higher than the GC1 group (P < .05). Aging significantly decreased the fracture strength of the IPS group (P < .05).

Conclusion: All monolithic crowns employed in this research proved to be resistant to physiological chewing forces in the anterior region.

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热机械老化对不同CAD-CAM材料制备前冠断裂强度的影响。

目的：探讨热机械老化对CAD/CAM（计算机辅助设计与计算机辅助制造）前牙冠断裂强度的影响。材料与方法：制备树脂上颌中切牙，获得96个环氧树脂复制品。制作前牙冠分为IPS （IPS e.max CAD， 1.5 mm厚度）、CD （Celtra Duo， 1.5 mm厚度）、GC （GC Initial UHT， 1.5 mm厚度）和GC1 （GC Initial UHT， 1 mm厚度）4组。每组12只牙冠进行24万次模拟咀嚼，其余12只牙冠作为对照。使用万能试验机（Shimadzu AGS-X）测试老化和未老化冠的抗断裂能力。采用单因素方差分析、Tukey事后检验和独立样本t检验对数据进行分析，P值< 0.05。结果：未老化的IPS冠断裂强度最高（2094.3±399.31 N），老化后的GC1冠断裂强度最低（1216.99±302.96 N）。相同厚度的试样经时效处理后的断裂强度差异无统计学意义（P < 0.05）。GC1组骨折强度显著低于其他各组（P < 0.05）。老化后;GC组骨折强度明显高于IPS组和GC1组。CD组骨折强度显著高于GC1组（P < 0.05）。老化显著降低IPS组的断裂强度（P < 0.05）。结论：本研究中所采用的全冠均能抵抗前区生理性咀嚼力。

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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来源期刊

Journal of Advanced Prosthodontics DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

4.70

自引率

3.80%

发文量

期刊介绍： This journal aims to convey scientific and clinical progress in the field of prosthodontics and its related areas to many dental communities concerned with esthetic and functional restorations, occlusion, implants, prostheses, and biomaterials related to prosthodontics. This journal publishes • Original research data of high scientific merit in the field of diagnosis, function, esthetics and stomatognathic physiology related to prosthodontic rehabilitation, physiology and mechanics of occlusion, mechanical and biologic aspects of prosthodontic materials including dental implants. • Review articles by experts on controversies and new developments in prosthodontics. • Case reports if they provide or document new fundamental knowledge.