INVESTIGATION THE FITTING ACCURACY OF CAST AND SLM CO-CR DENTAL BRIDGES USING CAD SOFTWARE

Tsanka Dikova; Tihomir Vasilev; Dzhendo Dzhendov; Elisaveta Ivanova

doi:10.5272/jimab.2017233.1688

Journal of IMAB - Annual Proceeding (Scientific Papers)
Publisher: Peytchinski Publishing
ISSN: 1312-773X (Online)
Issue: 2017, vol. 23, issue 3
Subject Area: Dental Medicine
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DOI: 10.5272/jimab.2017233.1688
Published online: 25 September 2017

Original article

J of IMAB 2017 Jul-Sep;23(3):1688-1696
INVESTIGATION THE FITTING ACCURACY OF CAST AND SLM CO-CR DENTAL BRIDGES USING CAD SOFTWARE
Tsanka Dikova¹ , Tihomir Vasilev² , Dzhendo Dzhendov³ , Elisaveta Ivanova² ,
1) Faculty of Dental Medicine, Medical University of Varna, Bulgaria
2) Department of Mechanics, Faculty of Engineering, Nikola Vaptsarov Naval Academy, Varna, Bulgaria
3) Department of Prosthetic Dentistry, Faculty of Dental Medicine, Medical University of Varna, Bulgaria.

ABSTRACT:
The aim of the present paper is to investigate the fitting accuracy of Co-Cr dental bridges, manufactured by three technologies, with the newly developed method using CAD software. The four-part dental bridges of Co-Cr alloys were produced by conventional casting of wax models, casting with 3D printed patterns and selective laser melting. The marginal and internal fit of dental bridges was studied out by two methods – silicone replica test and CAD software. As the silicone replica test characterizes with comparatively low accuracy, a new methodology for investigating the fitting accuracy of dental bridges was developed based on the SolidWorks CAD software. The newly developed method allows the study of the marginal and internal adaptation in unlimited directions and high accuracy. Investigation the marginal fit and internal adaptation of Co-Cr four-part dental bridges by the two methods show that the technological process strongly influences the fitting accuracy of dental restorations. The fitting accuracy of the bridges, cast with 3D printed patterns, is the highest, followed by the SLM and conventionally cast bridges. The marginal fit of the three groups of bridges is in the clinically acceptable range. The internal gap values vary in different regions – it is highest on the occlusal surfaces, followed by that in the marginal and axial areas. The higher fitting accuracy of the bridges, manufactured by casting with 3D printed patterns and SLM, compared to the conventionally cast bridges is a good precondition for their successful implementation in the dental offices and laboratories.

Keywords: dental bridges, fitting accuracy, silicone replica, CAD software, 3D printing, selective laser melting,

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Please cite this article in PubMed Style or AMA (American Medical Association) Style:
Dikova T, VasilevT, Dzhendov D, Ivanova E. Investigation the fitting accuracy of cast and SLM Co-Cr dental bridges using CAD software. J of IMAB. 2017 Jul-Sep;23(3):1688-1696. DOI: 10.5272/jimab.2017233.1688

Correspondence to: Assoc. Prof. Tsanka Dikova, Faculty of Dental Medicine, Medical University – Varna; 84, “Tsar Osvoboditel” str., 9000 Varna, Bulgaria; E-mail: tsanka_dikova@abv.bg

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Received: 19 June 2017
Published online: 25 September 2017

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