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

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...

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Autores principales: Duma, Virgil-Florin, Sinescu, Cosmin, Bradu, Adrian, Podoleanu, Adrian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6471312/
https://www.ncbi.nlm.nih.gov/pubmed/30901879
http://dx.doi.org/10.3390/ma12060947
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author Duma, Virgil-Florin
Sinescu, Cosmin
Bradu, Adrian
Podoleanu, Adrian
author_facet Duma, Virgil-Florin
Sinescu, Cosmin
Bradu, Adrian
Podoleanu, Adrian
author_sort Duma, Virgil-Florin
collection PubMed
description 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.
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spelling pubmed-64713122019-04-27 Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns Duma, Virgil-Florin Sinescu, Cosmin Bradu, Adrian Podoleanu, Adrian Materials (Basel) Article 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. MDPI 2019-03-21 /pmc/articles/PMC6471312/ /pubmed/30901879 http://dx.doi.org/10.3390/ma12060947 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Duma, Virgil-Florin
Sinescu, Cosmin
Bradu, Adrian
Podoleanu, Adrian
Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns
title Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns
title_full Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns
title_fullStr Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns
title_full_unstemmed Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns
title_short Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns
title_sort optical coherence tomography investigations and modeling of the sintering of ceramic crowns
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6471312/
https://www.ncbi.nlm.nih.gov/pubmed/30901879
http://dx.doi.org/10.3390/ma12060947
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