Effect of substructure fabrication method and design on the fracture resistance properties of metal-ceramic restorations.

IF 3.4 2区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE
Young-Hoon Lee, Yoon-Hyuk Huh, Chan-Jin Park, Lee-Ra Cho, Kyung-Ho Ko
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引用次数: 0

Abstract

Purpose: In metal-ceramic restorations, the substructure fabrication method and design may affect the prognosis of the prosthesis. This study evaluated and compared the fracture resistance of metal-ceramic restorations fabricated with different substructure fabrication methods using two different alloy powders and designs.

Materials and methods: Titanium abutments prepared for maxillary central incisor specimens were divided according to the substructure fabrication method (CAS, casting; SLM, selective laser melting), alloy powder type (SLM1, higher Cr and Mo contents; SLM2, control), and substructure design (A, covering one-third of the palatal surface; B, covering two-thirds). Six groups (n = 10 per group) were prepared for fracture resistance analysis. Following surface air particle abrasion of the substructures, their surface morphologies were observed, and the surface roughness was measured. After ceramic veneering, cementation to a titanium abutment, and water storage (24 h), thermomechanical aging was performed. The fracture load was measured, failure mode analysis was performed, and the ceramic-substructure interface was observed. Statistical analysis was also performed.

Results: The surface roughness was higher in the CAS group (compared to SLM1 and SLM2 groups), indicating that the fabrication method affected the fracture resistance. The substructure design and alloy powder composition had no effect. No surface roughness and fracture resistance differences were observed between the SLM1 and SLM2 groups. The most common fracture pattern was cervical ceramic fracture. No differences in fracture mode were observed between groups.

Conclusions: The fabrication method affected the fracture resistance, with SLM leading to a higher resistance. The substructure design had no effect on the fracture resistance.

子结构制作方法及设计对金属陶瓷修复体抗断裂性能的影响。
目的:在金属陶瓷修复体中,亚结构的制作方法和设计可能会影响修复体的预后。本研究评估并比较了采用两种不同合金粉末和设计的金属陶瓷修复体在不同亚结构制备方法下的抗断裂性能。材料与方法:上颌中切牙标本钛基牙按照亚结构制造方法(CAS、铸造;SLM,选择性激光熔化),合金粉末型(SLM1, Cr和Mo含量较高;SLM2,对照组)和子结构设计(A,覆盖腭表面的三分之一;B,覆盖三分之二)。6组(每组n = 10)进行抗断性分析。在表面空气颗粒磨损亚结构后,观察其表面形貌,并测量表面粗糙度。在陶瓷贴面、钛基台胶结和水储存(24小时)后,进行热机械老化。测试了断裂载荷,进行了破坏模式分析,并观察了陶瓷-子结构界面。并进行统计分析。结果:与SLM1和SLM2组相比,CAS组的表面粗糙度更高,说明制作方法影响了抗断裂能力。子结构设计和合金粉末成分对其性能没有影响。SLM1组和SLM2组的表面粗糙度和抗断裂性能均无差异。最常见的骨折类型为颈椎陶瓷骨折。两组间骨折方式无差异。结论:制作方法影响骨折抗折性,SLM导致更高的抗折性。下部结构设计对抗断裂性能没有影响。
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
CiteScore
7.90
自引率
15.00%
发文量
171
审稿时长
6-12 weeks
期刊介绍: The Journal of Prosthodontics promotes the advanced study and practice of prosthodontics, implant, esthetic, and reconstructive dentistry. It is the official journal of the American College of Prosthodontists, the American Dental Association-recognized voice of the Specialty of Prosthodontics. The journal publishes evidence-based original scientific articles presenting information that is relevant and useful to prosthodontists. Additionally, it publishes reports of innovative techniques, new instructional methodologies, and instructive clinical reports with an interdisciplinary flair. The journal is particularly focused on promoting the study and use of cutting-edge technology and positioning prosthodontists as the early-adopters of new technology in the dental community.
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