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Materials 2009, 2(3), 934-944; doi:10.3390/ma2030934
Article

Cytotoxic Evaluation of Elastomeric Dental Impression Materials on a Permanent Mouse Cell Line and on a Primary Human Gingival Fibroblast Culture

1
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2
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3
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3
 and
1,*
1 Department of Biomedical Sciences, Section of General Pathology, University of Modena and Reggio Emilia, Via G. Campi 287, 41100 Modena, Italy 2 Department of Neurosciences, Section of Dentistry, University of Modena and Reggio Emilia, Via del Pozzo 71, 41100 Modena, Italy 3 Department of Neurosciences, Section of Dentistry, University of Modena and Reggio Emilia, Via del Pozzo 71, 41100 Modena, Italy
* Author to whom correspondence should be addressed.
Received: 29 June 2009 / Revised: 27 July 2009 / Accepted: 11 August 2009 / Published: 14 August 2009
(This article belongs to the Special Issue Biocompatibility of Materials)
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Abstract

The need for clinically relevant in vitro tests of dental materials is widely recognized. Nearly all dental impression materials are introduced into the mouth just after mixing and allowed to set in contact with the oral tissues. Under these conditions, the materials may be toxic to cells or may sensitize the tissues. The aim of the present study is to evaluate the potential cytotoxicity of new preparations of elastomeric dental impression materials: A) four vinylpolysiloxanes: Elite H-D Putty and Elite H-D Light Body (Zhermack, Badia Polesine, Rovigo, Italy); Express Putty and Express Light Body (3M ESPE AG Seefeld, Germany) and B) two polyethers: Impregum Penta and Permadyne Penta L (3M ESPE AG Seefeld, Germany). The cytotoxicity of these impression materials were examined using two different cell lines: Balb/c 3T3 (permanent cell line) and human gingival fibroblasts (primary cell line) and their effects were studied by indirect and direct tests. The direct tests are performed by placing one sample of the impression materials in the centre of the Petri dishes at the time of the seeding of cells. The cell growth was evaluated at the 12th and 24th hours by cell number. The indirect tests were performed by incubating a square of 1 cm diameter impression material in 5 mL of medium at 37 °C for 24 hours (“eluates”). Subconfluent cultures are incubated with “eluates” for 24 hours. The MTT-formazan production is the method used for measuring the cell viability. The results indicate that: a) polyether materials are cytotoxic under both experimental conditions; b) among vinylpolysiloxanes, only Express Light Body (3M ESPE AG Seefeld, Germany) induces clear inhibition of cellular viability of Balb/c 3T3 evaluated by direct and indirect tests and c) the primary cell line is less sensitive to the toxic effect than the permanent cell line.
Keywords: dental impression materials; citotoxicity test; cell culture dental impression materials; citotoxicity test; cell culture
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.

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Boraldi, F.; Coppi, C.; Bortolini, S.; Consolo, U.; Tiozzo, R. Cytotoxic Evaluation of Elastomeric Dental Impression Materials on a Permanent Mouse Cell Line and on a Primary Human Gingival Fibroblast Culture. Materials 2009, 2, 934-944.

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