In Vitro Analysis of Shear Bond Strength in Repaired Cohesive and Adhesive Fractures of Conventional and DMLS Porcelain-fused-to-metal Crowns.

Q3 Dentistry

Journal of Contemporary Dental Practice Pub Date : 2024-08-01 DOI:10.5005/jp-journals-10024-3750

Ragul Irissan, Abhinav Mohan, Cimmy Augustine, Dipin Puthiya Parambath, Ahnaf Abdulla, Ankitha Thejus

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引用次数: 0

Abstract

Aim: Porcelain-fused-to-metal (PFM) restorations are essential in fixed prosthodontics for their strength and esthetics, but are prone to fractures due to material disparities and stress factors. This study evaluates the shear bond strength (SBS) of two porcelain repair systems for cohesive and adhesive fractures in conventional PFM and direct metal laser-sintered (DMLS) restorations, addressing clinical repair needs.

Materials and methods: Thirty metal-ceramic discs were fabricated and divided into two main groups based on the fabrication method: Conventional casting and DMLS. Each group had three subgroups: Conventional casting (A: Control, B: Cohesive defect, C: Adhesive defect) and DMLS (D: Control, E: Cohesive defect, F: Adhesive defect), each with 5 specimens. Shear bond strength was measured using a Universal Testing Machine (UTM) at 0.5 mm/min. Data were analyzed with a one-way ANOVA (α = 0.05), and Tukey's post hoc test was used for significant differences. Student's t-tests compared SBS between control groups.

Results: A one-way ANOVA revealed significant differences in SBS among Conventional Casting subgroups (p < 0.001). Subgroup A (36.282 ± 1.692 MPa) had higher SBS than B (13.202 ± 1.336 MPa) and C (17.033 ± 1.634 MPa), with Tukey's test confirming significant differences (p < 0.001). For DMLS subgroups, subgroup D (37.768 ± 0.560 MPa) had higher SBS than E (22.381 ± 1.137 MPa) and F (13.245 ± 0.693 MPa), with Tukey's test showing significant differences (p < 0.001). No significant difference was found between subgroups A and D (p = 0.10). Subgroup E had a higher SBS than B (p < 0.001), and subgroup C had a higher SBS than F (p = 0.001).

Conclusion: This study offers insights into the performance of two porcelain repair systems, aiding clinicians in selecting effective materials and techniques for PFM restoration repairs.

Clinical significance: Understanding the bond strength of these repair systems can enhance clinical outcomes by guiding the selection of optimal repair materials and techniques, improving the longevity and durability of fractured PFM restorations. How to cite this article: Irissan R, Mohan A, Augustine C, et al. In Vitro Analysis of Shear Bond Strength in Repaired Cohesive and Adhesive Fractures of Conventional and DMLS Porcelain-fused-to-metal Crowns. J Contemp Dent Pract 2024;25(8):726-731.

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传统与DMLS烤瓷-金属冠内聚性与黏附性骨折修复的体外剪切强度分析。

目的：由于金属烤瓷修复体的强度和美观，其修复体在固定口腔修复中是必不可少的，但由于材料差异和应力因素，其修复体容易发生骨折。本研究评估了两种瓷修复系统在常规PFM和直接金属激光烧结（DMLS）修复中对内聚性和黏附性骨折的剪切结合强度（SBS），以满足临床修复需求。材料和方法：制备了30个金属陶瓷圆盘，根据制备方法分为常规铸造和DMLS两大类。每组分为常规铸造（A：对照，B：粘连缺陷，C：粘连缺陷）和DMLS铸造（D：对照，E：粘连缺陷，F：粘连缺陷）3个亚组，每组5个标本。剪切粘接强度采用通用试验机（UTM）以0.5 mm/min的速度测量。数据分析采用单因素方差分析（α = 0.05），差异有统计学意义者采用Tukey’s事后检验。学生t检验比较对照组之间的SBS。结果：单因素方差分析显示，传统铸造亚组间SBS有显著差异（p < 0.001）。A亚组（36.282±1.692 MPa）的SBS高于B亚组（13.202±1.336 MPa）和C亚组（17.033±1.634 MPa），经Tukey检验差异有统计学意义（p < 0.001）。DMLS亚组中，D亚组（37.768±0.560 MPa）的SBS高于E亚组（22.381±1.137 MPa）和F亚组（13.245±0.693 MPa）， Tukey检验差异有统计学意义（p < 0.001）。A亚组与D亚组间无显著差异（p = 0.10）。E亚组的SBS高于B (p < 0.001)， C亚组的SBS高于F （p = 0.001）。结论：本研究提供了两种烤瓷修复系统的性能，帮助临床医生选择有效的材料和技术进行烤瓷修复。临床意义：了解这些修复系统的结合强度可以指导最佳修复材料和技术的选择，提高骨折PFM修复体的使用寿命和耐久性，从而提高临床效果。如何引用本文：Irissan R， Mohan A, Augustine C，等。传统与DMLS烤瓷-金属冠内聚性与黏附性骨折修复的体外剪切强度分析。[J]现代医学学报；2009;25(8):726-731。

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来源期刊

Journal of Contemporary Dental Practice Dentistry-Dentistry (all)

CiteScore

1.80

自引率

0.00%

发文量

174

期刊介绍： The Journal of Contemporary Dental Practice (JCDP), is a peer-reviewed, open access MEDLINE indexed journal. The journal’s full text is available online at http://www.thejcdp.com. The journal allows free access (open access) to its contents. Articles with clinical relevance will be given preference for publication. The Journal publishes original research papers, review articles, rare and novel case reports, and clinical techniques. Manuscripts are invited from all specialties of dentistry i.e., conservative dentistry and endodontics, dentofacial orthopedics and orthodontics, oral medicine and radiology, oral pathology, oral surgery, orodental diseases, pediatric dentistry, implantology, periodontics, clinical aspects of public health dentistry, and prosthodontics.