Document Detail

Comparative mechanical behavior of dentin enamel and dentin ceramic junctions assessed by speckle interferometry (SI).
MedLine Citation:
PMID:  22717295     Owner:  NLM     Status:  Publisher    
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.
Michel Fages; Pierre Slangen; Jacques Raynal; Stephane Corn; Kinga Turzo; Jacques Margerit; Frédéric J Cuisinier
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-18
Journal Detail:
Title:  Dental materials : official publication of the Academy of Dental Materials     Volume:  -     ISSN:  1879-0097     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8508040     Medline TA:  Dent Mater     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
EA4203, Department of Biologic Sciences, University of Montpellier I, Montpellier, France.
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