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Appl. Sci. 2017, 7(6), 552; doi:10.3390/app7060552

Effects of Temperature Variations during Sintering of Metal Ceramic Tooth Prostheses Investigated Non-Destructively with Optical Coherence Tomography

1
School of Dental Medicine, Victor Babes University of Medicine and Pharmacy of Timisoara, 2A Eftimie Murgu Place, Timisoara 300070, Romania
2
Applied Optics Group, School of Physical Sciences, University of Kent, Canterbury CT2 7NH, UK
3
3OM Optomechatronics Group, Faculty of Engineering, Aurel Vlaicu University of Arad, 77 Revolutiei Ave., Arad 310130, Romania
4
Doctoral School, Polytechnic University of Timisoara, 1 Mihai Viteazu Ave., Timisoara 300222, Romania
These authors had equal contributions.
*
Author to whom correspondence should be addressed.
Academic Editor: Michael Pircher
Received: 23 March 2017 / Revised: 23 May 2017 / Accepted: 24 May 2017 / Published: 26 May 2017
(This article belongs to the Special Issue Development and Application of Optical Coherence Tomography (OCT))
View Full-Text   |   Download PDF [3319 KB, uploaded 26 May 2017]   |  

Abstract

Calibration loss of ovens used in sintering metal ceramic prostheses leads to stress and cracks in the material of the prostheses fabricated, and ultimately to failure of the dental treatment. Periodic calibration may not be sufficient to prevent such consequences. Evaluation methods based on firing supplemental control samples are subjective, time-consuming, and rely entirely on the technician’s skills. The aim of this study was to propose an alternative procedure for such evaluations. Fifty prostheses were sintered in a ceramic oven at a temperature lower, equal to or larger than the temperature prescribed by the manufacturer. A non-destructive imaging method, swept source (SS) optical coherence tomography (OCT) was used to evaluate comparatively the internal structure of prostheses so fabricated. A quantitative assessment procedure is proposed, based on en-face OCT images acquired at similar depths inside the samples. Differences in granulation and reflectivity depending on the oven temperature are used to establish rules-of-thumb on judging the correct calibration of the oven. OCT evaluations made on a regular basis allow an easy and objective monitoring of correct settings in the sintering process. This method can serve rapid identification of the need to recalibrate the oven and avoid producing prostheses with defects. View Full-Text
Keywords: metal ceramic dental prostheses; optical coherence tomography (OCT); non-destructive evaluation; sintering technology; material defects metal ceramic dental prostheses; optical coherence tomography (OCT); non-destructive evaluation; sintering technology; material defects
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sinescu, C.; Bradu, A.; Duma, V.-F.; Topala, F.; Negrutiu, M.; Podoleanu, A.G. Effects of Temperature Variations during Sintering of Metal Ceramic Tooth Prostheses Investigated Non-Destructively with Optical Coherence Tomography. Appl. Sci. 2017, 7, 552.

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