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Dent. J. 2018, 6(3), 35; https://doi.org/10.3390/dj6030035

In Vitro Fracture Strength of Teeth Restored with Lithium Disilicate Onlays with and without Fiber Post Build-Up

1
Department of Prosthodontics, Dental School, Dental Clinic, University of Ferrara, 44121 Ferrara, Italy
2
Department of Medical Biotechnologies, University of Siena, 53100 Siena, Italy
3
Department of Engineering, University of Ferrara, 44124 Ferrara, Italy
*
Author to whom correspondence should be addressed.
Received: 1 July 2018 / Revised: 11 July 2018 / Accepted: 17 July 2018 / Published: 23 July 2018
(This article belongs to the Section Restorative Dentistry and Traumatology)
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Abstract

To our knowledge there is no data about the mechanical performance of indirect restoration adhesively cemented on teeth without an adequate build-up to provide the correct geometrical configuration. The aim of this study was to compare the fracture strength of human teeth restored with lithium disilicate onlays, with and without fiber post build-up. Methods: Twenty human mandibular molars were horizontally sectioned and divided into two groups (n = 10). No treatment was applied in group A. Teeth in group B were endodontically treated, built-up using fiber post and composite core and prepared with a circumferential chamfer providing a 1 mm circumferential ferrule. Lithium disilicate onlays were pressed and luted on teeth using dual-curing luting composite. Teeth were tested under static load. Failures were classified as restorable or not restorable. Failure loads were analyzed with one-way analysis of variance. Failure modes were compared using Pearson’s Chi-square tests. Results: The mean fracture loads were 1383.5 N for group A and 1286.3 N for group B. No difference was found (p = 0.6). Ninety per cent of fractures were classified as not restorable in both groups, with no difference (p = 0.8). Conclusions: For teeth restored with adhesive procedures and lithium disilicate onlays, the presence of build-up with fiber post to provide retention and resistance form does not influence the fracture strength. View Full-Text
Keywords: all-ceramic; ferrule effect; fracture test; lithium disilicate; onlays; build-up; post-and-core build-up all-ceramic; ferrule effect; fracture test; lithium disilicate; onlays; build-up; post-and-core build-up
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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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Mobilio, N.; Fasiol, A.; Mollica, F.; Catapano, S. In Vitro Fracture Strength of Teeth Restored with Lithium Disilicate Onlays with and without Fiber Post Build-Up. Dent. J. 2018, 6, 35.

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