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Effects of Thermocycling and Occlusal Force on Adhesive Composite Crowns

Department of Preventive Dentistry, Periodontology and Cariology, Dental Institute, Zurich University, Plattenstrasse 11, CH-8028 Zurich, Switzerland

E. Mueller

Department of Preventive Dentistry, Periodontology and Cariology, Dental Institute, Zurich University, Plattenstrasse 11, CH-8028 Zurich, Switzerland

F. Lutz

Department of Preventive Dentistry, Periodontology and Cariology, Dental Institute, Zurich University, Plattenstrasse 11, CH-8028 Zurich, Switzerland

The aim of this in vitro study was to provide first quantitative data on the marginal adaptation and the required load to fracture of adhesive composite crowns with and without adhesive composite cores. Eighteen caries-free extracted human premolars were restored using fine hybrid composite crowns with margins located entirely in dentin. Six crowns were adhesively luted to dentin stubs, six to endodontically treated teeth with adhesive titanium posts and adhesive composite cores, and six to adhesive composite cores without posts. Another ten unprepared teeth served as a control. All restored teeth were subjected to long-term occlusal and thermal stresses. The marginal adaptation was evaluated in the SEM before and after loading. Load to fracture was recorded at the end of the stress. Before stressing, 72.2 to 85.0%, and after stressing, 51.9 to 66.2% of "continuous margin" were recorded at the dentin-luting composite interface. The best results after stressing were achieved with crowns luted to adhesive composite cores without titanium posts. At the luting composite-composite crown interface, 61.6 to 88.7% of "continuous margin" before and 57.7 to 75.5% after stressing were recorded. The required load to fracture the restored teeth ranged from 72.0 to 89.2% of the unrestored, unloaded control. Adhesive composite cores without titanium posts yielded the best results.

Key Words: Composites • Crowns • Fatigue • Electron • Scanning Microscopy

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Journal of Dental Research, Vol. 73, No. 6, 1228-1232 (1994)
DOI: 10.1177/00220345940730061501


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Krejci, I. Articles by Lutz, F. Search for Related Content PubMed PubMed Citation Articles by Krejci, I. Articles by Lutz, F. Social Bookmarking                         What's this?