Influence of Pontic Length on the Structural Integrity of Zirconia Fixed Partial Dentures (FPDs).

IF 5 3区医学 Q1 ENGINEERING, BIOMEDICAL

Journal of Functional Biomaterials Pub Date : 2025-03-25 DOI:10.3390/jfb16040116

Tareq Hajaj, Ioana Elena Lile, Ioana Veja, Florina Titihazan, Mihai Rominu, Meda Lavinia Negruțiu, Cosmin Sinescu, Andreea Codruta Novac, Serban Talpos Niculescu, Cristian Zaharia

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引用次数: 0

Abstract

Objective: This study aims to evaluate the influence of pontic length and design on the fracture resistance of zirconia fixed dental prostheses (FDPs). By assessing different span lengths under controlled mechanical loading conditions, the research seeks to provide insights into optimizing the structural integrity of zirconia dental bridges.

Materials and methods: A total of 20 zirconia bridges were fabricated and tested in vitro. Ten bridges were designed to replace a single missing molar (tooth 46), with a pontic span of 11 mm, while the remaining ten were crafted for two missing teeth (35 and 36), featuring a longer pontic span of 17 mm. The zirconia frameworks were milled using the Wieland Zenotec^® Select Hybrid system and cemented onto metal abutments with Voco Meron Plus QM resin-reinforced glass ionomer cement. The specimens were subjected to occlusal loading using a ZwickRoell ProLine Z005 testing machine at a crosshead speed of 1 mm/min until fracture occurred.

Results: The mechanical testing revealed a significant correlation between pontic length and fracture resistance. The mean fracture resistance for three-unit bridges (single pontic) was 3703 N, whereas four-unit bridges (double pontic) exhibited a significantly lower resistance of 1713 N. These findings indicate that increased span length reduces the fracture resistance of zirconia restorations due to higher stress accumulation and reduced rigidity.

Conclusions: This study underscores the importance of pontic length and design in determining the fracture resistance of zirconia restorations. Shorter spans exhibit greater structural stability, reinforcing the need for careful treatment planning when designing multi-unit zirconia bridges. By optimizing bridge parameters, clinicians can improve clinical outcomes and extend the longevity of zirconia prostheses in restorative dentistry.

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桥孔长度对氧化锆固定局部义齿结构完整性的影响。

目的：探讨桥体长度和桥体设计对氧化锆固定义齿（fdp）抗断裂性能的影响。通过在受控的机械载荷条件下评估不同的跨度长度，该研究旨在为优化氧化锆牙桥的结构完整性提供见解。材料与方法：制备了20个氧化锆桥并进行了体外实验。10个桥被设计用于替换一颗缺失的磨牙（46颗牙齿），桥跨为11毫米，而其余10个桥被设计用于替换两颗缺失的牙齿（35和36），桥跨更长，为17毫米。使用Wieland Zenotec®Select Hybrid系统研磨氧化锆框架，并使用Voco Meron Plus QM树脂增强玻璃离子聚合物水泥将其粘合到金属基台上。试件在ZwickRoell ProLine Z005试验机上以1 mm/min的十字速度进行咬合加载，直至发生断裂。结果：力学测试显示桥桥长度与抗骨折性有显著相关性。三单元桥（单桥）的平均断裂抗力为3703 N，而四单元桥（双桥）的平均断裂抗力显著降低，为1713 N。这些研究结果表明，增加跨长会降低氧化锆修复体的断裂抗力，这是由于应力积累增加和刚度降低。结论：本研究强调了桥桥长度和设计在确定氧化锆修复体抗断裂性中的重要性。较短的跨度表现出更大的结构稳定性，因此在设计多单元氧化锆桥时需要仔细的处理规划。通过优化桥体参数，临床医生可以改善临床效果，延长氧化锆修复体在口腔修复中的使用寿命。

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 Functional Biomaterials Engineering-Biomedical Engineering

CiteScore

4.60

自引率

4.20%

发文量

226

审稿时长

11 weeks

期刊介绍： Journal of Functional Biomaterials (JFB, ISSN 2079-4983) is an international and interdisciplinary scientific journal that publishes regular research papers (articles), reviews and short communications about applications of materials for biomedical use. JFB covers subjects from chemistry, pharmacy, biology, physics over to engineering. The journal focuses on the preparation, performance and use of functional biomaterials in biomedical devices and their behaviour in physiological environments. Our aim is to encourage scientists to publish their results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Several topical special issues will be published. Scope: adhesion, adsorption, biocompatibility, biohybrid materials, bio-inert materials, biomaterials, biomedical devices, biomimetic materials, bone repair, cardiovascular devices, ceramics, composite materials, dental implants, dental materials, drug delivery systems, functional biopolymers, glasses, hyper branched polymers, molecularly imprinted polymers (MIPs), nanomedicine, nanoparticles, nanotechnology, natural materials, self-assembly smart materials, stimuli responsive materials, surface modification, tissue devices, tissue engineering, tissue-derived materials, urological devices.