Teeth restored using fiber-reinforced posts: in vitro fracture tests and finite element analysis

Schmitter, M; Rammelsberg, P; Lenz, J; Scheuber, S; Schweizerhof, K; Rues, S (2010). Teeth restored using fiber-reinforced posts: in vitro fracture tests and finite element analysis. Acta biomaterialia, 6(9), pp. 3747-54. Amsterdam: Elsevier 10.1016/j.actbio.2010.03.012

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In dentistry the restoration of decayed teeth is challenging and makes great demands on both the dentist and the materials. Hence, fiber-reinforced posts have been introduced. The effects of different variables on the ultimate load on teeth restored using fiber-reinforced posts is controversial, maybe because the results are mostly based on non-standardized in vitro tests and, therefore, give inhomogeneous results. This study combines the advantages of in vitro tests and finite element analysis (FEA) to clarify the effects of ferrule height, post length and cementation technique used for restoration. Sixty-four single rooted premolars were decoronated (ferrule height 1 or 2 mm), endodontically treated and restored using fiber posts (length 2 or 7 mm), composite fillings and metal crowns (resin bonded or cemented). After thermocycling and chewing simulation the samples were loaded until fracture, recording first damage events. Using UNIANOVA to analyze recorded fracture loads, ferrule height and cementation technique were found to be significant, i.e. increased ferrule height and resin bonding of the crown resulted in higher fracture loads. Post length had no significant effect. All conventionally cemented crowns with a 1-mm ferrule height failed during artificial ageing, in contrast to resin-bonded crowns (75% survival rate). FEA confirmed these results and provided information about stress and force distribution within the restoration. Based on the findings of in vitro tests and computations we concluded that crowns, especially those with a small ferrule height, should be resin bonded. Finally, centrally positioned fiber-reinforced posts did not contribute to load transfer as long as the bond between the tooth and composite core was intact.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > School of Dental Medicine > Division of Fixed Prosthodontics [discontinued]
UniBE Contributor:	Scheuber, Sybille
ISSN:	1742-7061
Publisher:	Elsevier
Language:	English
Submitter:	Eveline Carmen Schuler
Date Deposited:	04 Oct 2013 14:08
Last Modified:	05 Dec 2022 14:00
Publisher DOI:	10.1016/j.actbio.2010.03.012
PubMed ID:	20227533
Web of Science ID:	000281318400043
URI:	https://boris.unibe.ch/id/eprint/466 (FactScience: 199470)