| Comparative mechanical behavior of dentin enamel and dentin ceramic junctions assessed by speckle interferometry (SI). | |
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MedLine Citation:
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PMID: 22717295 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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OBJECTIVE: The dentin-enamel junction (DEJ) plays a crucial role in dental biomechanics; however, little is known about its structure and mechanical behavior. Nevertheless, natural teeth are a necessary model for prosthetic crowns. The mechanical behavior of the natural DEJ and the dentin ceramic junction (DCJ) manufactured with a CAD-CAM system are compared. METHODS: The reference samples undergo no modification, while the experimental samples were drilled to receive a cemented feldspathic ceramic crown. Longitudinally cut samples were used to achieve a planar object observation and to look "inside" the tooth. A complete apparatus enabling the study of the compressive mechanical behavior of the involved tooth by a non-contact laser speckle interferometry (SI) was developed to allow nanometric displacements to be tracked during the compression test. RESULTS: It is observed that the DEJ acted as a critical zone accommodating the movement between dentin and enamel. A smooth transition occurs between dentin and enamel. In the modeled prosthetic, the same kind of accommodation effects also occurs, but with a steeper transition slope between dentin and ceramic. SIGNIFICANCE: On the natural tooth, the stress accommodation arises from a differential behavior between enamel and dentin from the DEJ. In the ceramic crown, the cemented dentin-ceramic junction should play this role. This study demonstrates the possible realization of prosthetic crown reconstructions approaching biomechanical behaviors. |
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Authors:
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Michel Fages; Pierre Slangen; Jacques Raynal; Stephane Corn; Kinga Turzo; Jacques Margerit; Frédéric J Cuisinier |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-6-18 |
Journal Detail:
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Title: Dental materials : official publication of the Academy of Dental Materials Volume: - ISSN: 1879-0097 ISO Abbreviation: - Publication Date: 2012 Jun |
Date Detail:
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Created Date: 2012-6-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8508040 Medline TA: Dent Mater Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2012 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. |
Affiliation:
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EA4203, Department of Biologic Sciences, University of Montpellier I, Montpellier, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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