Marginal and Internal Adaptation of Implant-Supported Three-Unit Metal Frameworks Fabricated by the Conventional, Semi-Digital, and Fully Digital Techniques Before and After Porcelain Application

IF 2.2 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Clinical and Experimental Dental Research Pub Date : 2025-07-09 DOI:10.1002/cre2.70173

Mansour Karimi, Hamid Neshandar Asli, Yeganeh Hamrah, Mohammad Ebrahim Ghaffari, Mehran Falahchai

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引用次数: 0

Abstract

Objectives

Only a small number of studies conducted on implant-supported fixed multi-unit restorations have evaluated the semi-digital fabrication techniques. This study aimed to assess the marginal and internal adaptation of implant-supported three-unit metal frameworks fabricated by the conventional, semi-digital, and fully digital techniques before and after porcelain application.

Material and Methods

In this in vitro study, 120 three-unit metal frameworks were fabricated by five different techniques (n = 20): fabrication of metal frameworks from hard metal by the milling technique, direct 3D-printing of metal, milling of resin pattern and subsequent casting, 3D-printing of resin pattern and subsequent casting, and conventional waxing and subsequent casting. The marginal and internal adaptation of the frameworks was evaluated before and after porcelain application by using the silicone replica technique. Data were analyzed using ANOVA followed by pairwise comparisons with the Games-Howell and paired samples tests (α = 0.05).

Results

Before porcelain application, resin pattern milling, and subsequent casting resulted in the smallest marginal gap, while hard metal milling yielded the largest marginal gap. The fully digital techniques yielded the largest cuspal and fossa gaps, while the conventional method yielded the largest axial gap. After porcelain application, metal 3D-printing and conventional casting resulted in comparable (p = 0.109) marginal gaps, smaller than hard metal milling (p < 0.001). The conventional casting method yielded the smallest cuspal and fossa gaps (p < 0.001). Porcelain application significantly increased the gap size at all measurement points (p < 0.001).

Conclusion

The fabrication technique significantly affected the marginal and internal adaptation of implant-supported three-unit metal frameworks both before and after porcelain application.

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传统、半数字化和全数字化技术制备的种植支撑三单元金属框架在瓷应用前后的边缘和内部适应性

目的对半数字化修复技术进行了评估，目前对种植体支持的固定多单元修复体进行了少量的研究。本研究旨在评估采用传统、半数字化和全数字化技术制作的种植体支持的三单元金属框架在烤瓷应用前后的边缘和内部适应性。在这项体外研究中，采用五种不同的技术（n = 20）制造了120个三单元金属框架：硬质金属铣削技术制造金属框架，直接3d打印金属，铣削树脂模型并随后铸造，树脂模型3d打印并随后铸造，以及常规打蜡和随后铸造。采用硅树脂复刻技术对瓷体应用前后框架的边缘适应性和内部适应性进行了评价。数据分析采用方差分析，并采用Games-Howell检验和配对样本检验两两比较（α = 0.05）。结果在应用瓷之前，树脂模式铣削和随后的铸造产生最小的边缘间隙，而硬金属铣削产生最大的边缘间隙。全数字技术产生了最大的尖窝间隙，而传统方法产生了最大的轴向间隙。在陶瓷应用后，金属3d打印和传统铸造产生的边际间隙相当（p = 0.109），小于硬金属铣削（p < 0.001）。传统铸造方法的牙尖和牙窝间隙最小（p < 0.001）。瓷的应用显著增加了所有测量点的间隙尺寸（p < 0.001）。结论制作工艺对种植体支撑的三单元金属框架在烤瓷应用前后的边缘适应性和内部适应性均有显著影响。

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来源期刊

Clinical and Experimental Dental Research DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

3.30

自引率

5.60%

发文量

165

审稿时长

26 weeks

期刊介绍： Clinical and Experimental Dental Research aims to provide open access peer-reviewed publications of high scientific quality representing original clinical, diagnostic or experimental work within all disciplines and fields of oral medicine and dentistry. The scope of Clinical and Experimental Dental Research comprises original research material on the anatomy, physiology and pathology of oro-facial, oro-pharyngeal and maxillofacial tissues, and functions and dysfunctions within the stomatognathic system, and the epidemiology, aetiology, prevention, diagnosis, prognosis and therapy of diseases and conditions that have an effect on the homeostasis of the mouth, jaws, and closely associated structures, as well as the healing and regeneration and the clinical aspects of replacement of hard and soft tissues with biomaterials, and the rehabilitation of stomatognathic functions. Studies that bring new knowledge on how to advance health on the individual or public health levels, including interactions between oral and general health and ill-health are welcome.