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Interfacial adaptation of a calcium aluminate cement used in class II cavities, in vivo
Umeå University, Faculty of Medicine, Department of Odontology, Cariology. Umeå University, Faculty of Medicine, Department of Odontology.
Umeå University, Faculty of Medicine, Department of Odontology, Dental Hygiene. Umeå University, Faculty of Medicine, Department of Odontology.
Umeå University, Faculty of Medicine, Department of Medical Biosciences.
2004 (English)In: Clinical Oral Investigations, ISSN 1432-6981, E-ISSN 1436-3771, Vol. 8, no 2, 75-80 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this in vivo study was to evaluate the interfacial marginal adaptation of a calcium aluminate cement, Doxadent (DD), and to compare it intra-individually with a resin composite, Tetric Ceram/Syntac Single-Component (TC/SS), in Class II cavities. Sixteen Class II box-shaped, enamel-bordered cavities were prepared in eight premolars scheduled to be extracted after 1 month's service for orthodontic reasons. The interfacial marginal adaptation (internal surfaces) of the restorations was evaluated by a quantitative scanning electron microscope analysis using a replica method. DD showed a statistically significant, lower degree of gap-free adaptation to enamel compared with TC/SS: 84% vs. 93%. To dentin, DD showed a significantly better adaptation than TC/SS: 72% vs. 49%. A high frequency of enamel fractures perpendicular to the margins was observed for the DD restorations, which may be explained by an expansion of the calcium-aluminate cement. It can be concluded that DD showed a better adaptation to dentin while TC/SS showed a better adaptation to enamel. The dimensional changes of DD have to be investigated before clinical use can be recommended.

Place, publisher, year, edition, pages
Springer-Verlag , 2004. Vol. 8, no 2, 75-80 p.
Keyword [en]
Clinical, Dental restoration, Dental cement, Interfacial adaptation
Identifiers
URN: urn:nbn:se:umu:diva-17140DOI: 10.1007/s00784-003-0242-3PubMedID: 14661081OAI: oai:DiVA.org:umu-17140DiVA: diva2:156813
Available from: 2007-11-02 Created: 2007-11-02 Last updated: 2010-08-25Bibliographically 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
Supervisors
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. vanHörstedt, Per
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