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Flexural strength and modulus of a novel ceramic restorative cement intended for posterior restorations as determined by a three-point bending test
Umeå University, Faculty of Medicine, Department of Odontology, Dental Hygiene. Umeå University, Faculty of Medicine, Department of Odontology.
Department of Dental Materials, School of Dentistry, University of Copenhagen, Denmark.
Umeå University, Faculty of Medicine, Department of Odontology.
2003 (English)In: Acta Odontologica Scandinavica, ISSN 0001-6357, Vol. 61, no 2, 87-92 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to compare a new restorative cement intended for posterior restorations, Doxadent, with other types of tooth-colored materials as regards flexural strength and flexural modulus. The new restorative material consists mainly of calcium aluminate. Four hybrid resin composites, one polyacid-modified resin composite, one resin-modified glass ionomer cement, one conventional glass ionomer cement, one zinc phosphate cement, and an experimental version as well as the marketed version of Doxadent were investigated. Flexural strength and flexural modulus were tested according to ISO standard 4049 and determined after 1 d, 1 week, and 2 weeks. Together with the zinc phosphate cement, Doxadent had the lowest flexural strengths (13-22 MPa). The strongest materials were the resin composites and the polyacid-modified resin composite (83-136 MPa). The highest flexural modulus was found for Doxadent (17-19 GPa). The flexural strength of Doxadent decreased significantly from 1 week to 2 weeks, while flexural modulus remained unchanged. The other materials reacted in different ways to prolonged water storage. It can be concluded that the restorative cement Doxadent had significantly lower flexural strength and significantly higher flexural modulus than today's materials used for direct posterior restorations.

Place, publisher, year, edition, pages
Taylor & Francis , 2003. Vol. 61, no 2, 87-92 p.
Keyword [en]
Composite, glass ionomer cement, mechanical properties, posterior restorations, zinc phosphate cement
URN: urn:nbn:se:umu:diva-17666DOI: 10.1080/00016350310001424PubMedID: 12790505OAI: diva2:157339
Available from: 2007-11-15 Created: 2007-11-15 Last updated: 2010-08-24Bibliographically approved
In thesis
1. Calcium aluminate cement as dental restorative: Mechanical properties and clinical durability
Open this publication in new window or tab >>Calcium aluminate cement as dental restorative: Mechanical properties and clinical durability
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In 1995, the Swedish government recommended the discontinuation of amalgam as restorative in paediatric dentistry. Because the mercury content in amalgam constitutes an environmental hazard, its use has declined. The use of resin composites is increasing, but the polymerisation shrinkage of the material is still undesirably high, and the handling of uncured resin can cause contact dermatitis. A new restorative material has recently been developed in Sweden as an alternative to amalgam and resin composite: a calcium aluminate cement (CAC). CAC has been marketed as a ceramic direct restorative for posterior restorations (class I, II) and for class V restorations. This thesis evaluates mechanical properties and clinical durability of the calcium aluminate cement when used for class II restorations. Hardness, in vitro wear, flexural strength, flexural modulus, and surface roughness were evaluated. A scanning electron replica method was used for evaluation of the interfacial adaptation to tooth structures in vivo. The durability was studied in a 2-year intra-individually clinical follow-up of class II restorations.

Major results and conclusions from the studies are as follows:

• The CAC was a relatively hard material, harder than resin-modified glass ionomer cement but within the range of resin composites. The CAC wore less than resin-modified glass ionomer cement but more than resin composite.

• Flexural strength of CAC was in the same range as that of zinc phosphate cement and far below that of both resin composite and resin-modified glass ionomer cement. Flexural modulus of CAC was higher than both resin composite and resin-modified glass ionomer cement. The low flexural strength of CAC precludes its use in stress-bearing areas.

• Surface roughness of CAC could be decreased by several polishing techniques.

• For CAC restorations, interfacial adaptation was higher to dentin but lower to enamel compared with resin composite restorations. Fractures were found perpendicular to the boarders of all CAC restorations and may indicate expansion of the material.

• After 2 years of clinical service, the class II CAC restorations showed an unacceptably high failure rate. Material fractures and tooth fractures were the main reasons for failure.

Place, publisher, year, edition, pages
Umeå: Umeå universitet. Institutionen för odontologi, 2004. 67 p.
Umeå University odontological dissertations, ISSN 0345-7532 ; 84
mechanical properties, clinical, restorations, ceramic, cement, resin composite, adaptation, SEM
Research subject
urn:nbn:se:umu:diva-270 (URN)91-7305-589-1 (ISBN)
Public defence
2004-06-03, Tandläkarhögskolan 9 tr, Sal D, Norrlands universitetssjukhus, Umeå, 09:00 (English)
Available from: 2004-05-12 Created: 2004-05-12 Last updated: 2010-08-24Bibliographically approved

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Sunnegårdh-Grönberg, KarinDijken, Jan W. V. van
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