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Surface roughness of a novel "ceramic restorative cement" after treatment with different polishing techniques in vitro
Umeå University, Faculty of Medicine, Department of Odontology.
Umeå University, Faculty of Medicine, Department of Odontology.
2003 (English)In: Clinical Oral Investigations, ISSN 1432-6981, E-ISSN 1436-3771, Vol. 7, no 1, 27-31 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to determine the surface roughness of a novel calcium aluminate cement (CAC) intended for posterior restorations after treatment with different polishing devices in vitro. Forty-eight CAC specimens were polished with diamond burs at 15,550 rpm or 27,000 rpm, Sof-Lex discs, Jiffy points, Shofu silicone points, and Aaba universal polisher. Amalgam specimens were polished with Shofu silicone points and used as reference. Roughness was measured using a profilometer. The smoothest CAC surface was observed after use of the fine Sof-Lex disc (roughness average [Ra] 0.26 mm). Diamond burs at higher speed, points, and polisher gave rather similar results (Ra 0.58–0.72 mm). An increase in surface roughness could be seen from using diamond burs at lower speed (Ra 2.3 mm). Extra fine Shofu points and Sof-Lex discs as a final step reincreased surface roughness. Polished amalgam showed the smoothest surface in the study (Ra 0.17). It can be concluded that the smoothest CAC surfaces were obtained with the fine Sof-Lex discs. Different polishing points and diamond burs at higher speed, which are suitable polishing devices for posterior restorations, also gave relatively smooth surfaces.

Place, publisher, year, edition, pages
Springer-Verlag , 2003. Vol. 7, no 1, 27-31 p.
Keyword [en]
surface properties, dental polishing, ceramics
Identifiers
URN: urn:nbn:se:umu:diva-3968DOI: 10.1007/s00784-002-0193-0OAI: oai:DiVA.org:umu-3968DiVA: diva2:142891
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
Supervisors
Available from: 2004-05-12 Created: 2004-05-12 Last updated: 2010-08-24Bibliographically approved

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