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Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

September 2002
Volume 33 , Issue 8

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Resistance to maxillary premolar fractures after restoration of Class II preparations with resin composite or ceromer

Cláudia Regina Buainain de Freitas, DMD, MS; Maria Isabel Serra Miranda, DMD; Marcelo Ferrarezi de Andrade, DDS, MS, PhD; Victor Humberto Orbegoso Flores, DDS, MS, PhD; Luís Geraldo Vaz, DDS, MS, PhD; Norberto Catanzaro Guimarães, DDS, MS, PhD

Pages: 589-594
PMID: 12238690

Objective: The aim of this study was to evaluate the resistance to fracture of intact and restored human maxillary premolars. Method and materials: Thirty noncarious human maxillary premolars, divided into three groups of 10, were submitted to mechanical tests to evaluate their resistance to fracture. Group 1 consisted of intact teeth. Teeth in group 2 received mesio-occlusodistal cavity preparations and were restored with direct resin composite restorations. Teeth in group 3 received mesio-occlusodistal cavity preparations and were restored with ceromer inlays placed with the indirect technique. After restoration, teeth were stored at 37°C for 24 hours and then thermocycled for 500 cycles at temperatures of 5°C and 55°C. Results: Statistical analysis revealed that group 3 (178.765 kgf) had a significantly greater maximum rupture load than did group 1 (120.040 kgf). There was no statistically significant difference between groups 1 and 2 or between groups 2 and 3. Conclusion: Class II cavity preparations restored with indirect ceromer inlays offered greater resistance to fracture than did intact teeth. The fracture resistance of teeth restored with resin composite was not significantly different from that of either the ceromer or intact teeth.

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