Comparative mechanical behavior of dentin enamel and dentin ceramic junctions assessed by speckle interferometry (SI)
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 ju...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
2012
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| Sorozat: | DENTAL MATERIALS
28 No. 10 |
| doi: | 10.1016/j.dental.2012.05.006 |
| mtmt: | 2082244 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/12296 |
| Tartalmi kivonat: | 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. © 2012 Academy of Dental Materials. |
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| Terjedelem/Fizikai jellemzők: | e229-e238 |
| ISSN: | 0109-5641 |