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Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns

1
3OM Optomechatronics Group, Faculty of Engineering, Aurel Vlaicu University of Arad, 77 Revolutiei Ave., 310130 Arad, Romania
2
Doctoral School, Polytechnic University of Timisoara, 1 Mihai Viteazu Ave., 300222 Timisoara, Romania
3
School of Dental Medicine, Victor Babes University of Medicine and Pharmacy of Timisoara, 2A Eftimie Murgu Place, 300070 Timisoara, Romania
4
Applied Optics Group, School of Physics, University of Kent, Canterbury CT2 7NR, UK
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(6), 947; https://doi.org/10.3390/ma12060947
Received: 2 March 2019 / Revised: 14 March 2019 / Accepted: 15 March 2019 / Published: 21 March 2019
(This article belongs to the Special Issue Advanced Materials for Regenerative and Restorative Dentistry)
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Abstract

Dental prostheses are sintered in ovens that sometimes suffer from a loss of calibration. This can lead to variations of the sintering temperature outside the range recommended by the manufacturer. Stress and even fractures in dental ceramics may occur, and this leads to the necessity to rebuild the dental construct. The aim of this work is to monitor the quality of sintering processes using an established biomedical imaging technique—optical coherence tomography (OCT). Conventional current procedures imply the fabrication of supplemental samples that add to the expenses and are only evaluated visually. To our knowledge, we were the first to propose the use of OCT, a non-destructive method that brings objectivity for such assessments, focusing, in a previous study, on metal ceramic dental prostheses. Here, a different material, pressed ceramics, is considered, while we propose a quantitative assessment of the results—using reflectivity profiles of en-face (i.e., constant-depth) OCT images of sintered samples. The results for both the pressed ceramics and metal ceramics prostheses are discussed by obtaining the analytic functions of their reflectivity profiles. A multi-parametric analysis demonstrates the best parameter to characterize the loss of calibration of dental ovens. Rules-of-thumb are extracted; producing dental prostheses with defects can thus be avoided. View Full-Text
Keywords: Sintering; dental prosthesis; pressed ceramics; Optical Coherence Tomography (OCT); non-destructive testing (NDT); calibration of dental ovens; modeling; multi-parametric analysis Sintering; dental prosthesis; pressed ceramics; Optical Coherence Tomography (OCT); non-destructive testing (NDT); calibration of dental ovens; modeling; multi-parametric analysis
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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

Duma, V.-F.; Sinescu, C.; Bradu, A.; Podoleanu, A. Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns. Materials 2019, 12, 947.

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