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Evaluation of the marginal fit of three margin designs of resin composite crowns using CAD/CAM

Tsitrou, E., Northeast, S. and van Noort, R. (2007) Evaluation of the marginal fit of three margin designs of resin composite crowns using CAD/CAM. Journal of Dentistry, 35 (1). pp. 68-73. ISSN 0300-5712

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Abstract

OBJECTIVES: To examine the marginal fit of resin composite crowns manufactured with the CEREC 3 system employing three different margin designs; bevel, chamfer and shoulder, by means of a replica technique and a luting agent.

METHODS: Three master casts were fabricated from an impression of a typodont molar tooth and a full-coverage crown prepared with a marginal finish of a bevel, a chamfer and a shoulder. Each cast was replicated 10 times (n = 10). Scanning of the replicas and crown designing was performed using the CEREC ScanTM system. The crowns were milled from Paradigm MZ100TM composite resin blocks. The marginal fit of the crowns was evaluated with a replica technique (AquasilTM LV, Dentsply), and with a resin composite cement (RelyXTM Unicem, AplicapTM) and measured with a travelling microscope. Statistical analysis was performed using two-way ANOVA.

RESULTS: For the replica technique the average marginal gaps recorded were: Bevel Group 105±34 mm, Chamfer Group 94±27 mm and Shoulder Group 91±22 mm. For the resin composite cement the average marginal gaps were: Bevel Group 102±28 mm, Chamfer Group 91±11 mm and Shoulder Group 77±8 mm. Two-way ANOVA analysis showed that there was no statistically significant difference between the three groups of finishing lines regardless of the cementation technique used.

CONCLUSIONS: The marginal gap of resin composite crowns manufactured with the CEREC 3 system is within the range of clinical acceptance, regardless of the finishing line prepared or the cementation technique used.

Item Type: Article
Copyright, Publisher and Additional Information: © 2007 Elsevier B.V. This is an author produced version of a paper published in Journal of Densitry. Uploaded in accordance with the publisher's self archiving policy.
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Dentistry (Sheffield) > Department of Adult Dental Care (Sheffield)
Depositing User: Sherpa Assistant
Date Deposited: 02 Oct 2008 11:28
Last Modified: 08 Feb 2013 16:56
Published Version: http://dx.doi.org/10.1016/j.jdent.2006.04.008
Status: Published
Publisher: Elsevier B.V.
Identification Number: 10.1016/j.jdent.2006.04.008
URI: http://eprints.whiterose.ac.uk/id/eprint/4721

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