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Hardness and in vitro wear of a novel ceramic restorative cement
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.
2002 (English)In: European Journal of Oral Sciences, ISSN 0909-8836, E-ISSN 1600-0722, Vol. 110, no 2, 175-178 p.Article in journal (Refereed) Published
Abstract [en]

The aim of the present work was to compare a new ceramic restorative cement for posterior restorations, DoxaDent, with other types of tooth-colored materials for direct use as regards hardness and in vitro wear. Four hybrid resin composites, one polyacid-modified resin composite, one resin-modified glass ionomer cement, one conventional glass ionomer cement, one zinc phosphate cement, an experimental version as well as the marketed version of the ceramic restorative cement, were investigated. Hardness of the materials was tested with the Wallace indentation tester and wear was tested with the ACTA wear machine. All tests were carried out on 2-wk-old specimens. DoxaDent was as hard as the zinc phosphate cement and the hardest resin composite. The ceramic restorative cement wore significantly more than the resin composites, the same as the zinc phosphate cement, and less than the glass ionomer cements. No correlation between hardness and wear was found. It can be concluded that the ceramic restorative cement is a rather hard material but with a relatively low wear resistance.

Place, publisher, year, edition, pages
John Wiley & Sons, Inc , 2002. Vol. 110, no 2, 175-178 p.
Keyword [en]
physical properties, posterior restorations, composite, glass ionomer cement, zinc phosphate cement
Identifiers
URN: urn:nbn:se:umu:diva-3966DOI: 10.1034/j.1600-0722.2002.11226.xOAI: oai:DiVA.org:umu-3966DiVA: diva2:142889
Available from: 2004-05-12 Created: 2004-05-12 Last updated: 2017-12-14Bibliographically 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.
Series
Umeå University odontological dissertations, ISSN 0345-7532 ; 84
Keyword
mechanical properties, clinical, restorations, ceramic, cement, resin composite, adaptation, SEM
Research subject
Odontology
Identifiers
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)
Opponent
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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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