Marginal fit and retention force of zirconia resin-bonded fixed dental prostheses in the posterior region with different designs

IF 3.4 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Journal of Dental Sciences Pub Date : 2024-07-01 DOI:10.1016/j.jds.2023.12.010
Yue Yin , Kosuke Nozaki , Reina Nemoto , Omnia Saleh , Yayoi Oishi , Mayuko Matsumura , Wataru Komada , Hiroyuki Miura , Kenji Fueki
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Abstract

Background/purpose

Retainer debonding of resin-bonded fixed dental prostheses (RBFDPs) is one of the major reasons for their lower survival rates than fixed dental prostheses (FDPs) with full-coverage crowns. Recent advances in milling technology have enabled the fabrication of RBFDPs with complex retainers (D-shaped designs). This study aimed to assess the marginal fit and retention force of zirconia RBFDPs with inlay-, L-, and D-shaped designs to clarify their clinical applications.

Materials and methods

Three abutment teeth models without maxillary second premolars were created using inlay-, L-, and D-shaped retainer designs. The zirconia RBFDPs were designed and fabricated according to the manufacturer’s instructions (n = 10). The marginal gap was measured using the silicone replica technique. Zirconia frameworks were bonded to the abutment teeth using resin cement. Tensile test was conducted after thermal cycling and dynamic loading tests. The loads during debonding or fracture were recorded. The failure pattern was analyzed by observing the fracture surface using a scanning electron microscope.

Results

D-shaped RBFDPs showed a significantly larger marginal gap than inlay- and L-shaped RBFDPs (P < 0.05). However, the mean marginal values were clinically acceptable (<120 μm). The D-shaped model exhibited the highest tensile strength in the tensile tests. The inlay-shaped and most of the D-shaped RBFDPs experienced debonding with cohesive failure, whereas the L-shaped RBFDPs showed fractures near the connector.

Conclusion

The D-shaped retainer design was superior to the inlay- and L-shaped designs with respect to the inhibition of retainer debonding. However, the marginal fitness needs to be improved.

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不同设计的氧化锆树脂粘结固定义齿在后牙区的边缘密合度和固位力
背景/目的树脂粘结固定义齿(RBFDP)的固位体脱粘是其存活率低于全覆盖冠固定义齿(FDP)的主要原因之一。最近铣削技术的进步使得制作带有复杂固位体(D 型设计)的 RBFDP 成为可能。本研究旨在评估镶嵌式、L型和D型设计的氧化锆RBFDP的边缘密合度和固位力,以明确其临床应用。材料和方法使用镶嵌式、L型和D型固位体设计制作了三个无上颌第二前磨牙的基牙模型。氧化锆 RBFDP 按照制造商的说明进行设计和制作(n = 10)。使用硅胶复制技术测量边缘间隙。使用树脂粘结剂将氧化锆框架粘结到基牙上。热循环和动态加载测试后进行拉伸测试。记录脱粘或断裂时的载荷。结果D型RBFDP的边缘间隙明显大于嵌体型和L型RBFDP(P< 0.05)。不过,平均边缘值在临床上是可以接受的(<120 μm)。在拉伸试验中,D 型模型的拉伸强度最高。结论在抑制固位体脱落方面,D 型固位体设计优于嵌体和 L 型设计。但是,边缘适配性还需要改进。
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来源期刊
Journal of Dental Sciences
Journal of Dental Sciences 医学-牙科与口腔外科
CiteScore
5.10
自引率
14.30%
发文量
348
审稿时长
6 days
期刊介绍: he Journal of Dental Sciences (JDS), published quarterly, is the official and open access publication of the Association for Dental Sciences of the Republic of China (ADS-ROC). The precedent journal of the JDS is the Chinese Dental Journal (CDJ) which had already been covered by MEDLINE in 1988. As the CDJ continued to prove its importance in the region, the ADS-ROC decided to move to the international community by publishing an English journal. Hence, the birth of the JDS in 2006. The JDS is indexed in the SCI Expanded since 2008. It is also indexed in Scopus, and EMCare, ScienceDirect, SIIC Data Bases. The topics covered by the JDS include all fields of basic and clinical dentistry. Some manuscripts focusing on the study of certain endemic diseases such as dental caries and periodontal diseases in particular regions of any country as well as oral pre-cancers, oral cancers, and oral submucous fibrosis related to betel nut chewing habit are also considered for publication. Besides, the JDS also publishes articles about the efficacy of a new treatment modality on oral verrucous hyperplasia or early oral squamous cell carcinoma.
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