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Effect of cements on fracture resistance of monolithic zirconia crowns

5 January 2016 //  by Biodentistry.eu//  Leave a Comment

Nakamura K1, Mouhat M2, Nergård JM2, Lægreid SJ2, Kanno T3, Milleding P4, Örtengren U5.

Author information:

1Department of Prosthetic Dentistry/Dental Materials Science, Institute of Odontology, University of Gothenburg, Gothenburg, Sweden; Laboratory for Redox Regulation, Tohoku University Graduate School of Dentistry, Sendai, Japan.
2Research Group for Biomaterials Used in Dentistry and Medicine, Department for Clinical Dentistry, Faculty of Health Sciences, the Arctic University of Norway , Tromsø , Norway.
3Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry , Sendai , Japan.
4Department of Prosthetic Dentistry/Dental Materials Science, Institute of Odontology, University of Gothenburg , Gothenburg , Sweden.
5Department of Prosthetic Dentistry/Dental Materials Science, Institute of Odontology, University of Gothenburg, Gothenburg, Sweden; Research Group for Biomaterials Used in Dentistry and Medicine, Department for Clinical Dentistry, Faculty of Health Sciences, the Arctic University of Norway, Tromsø, Norway.
Abstract
Objectives The present study investigated the effect of cements on fracture resistance of monolithic zirconia crowns in relation to their compressive strength. Materials and methods Four different cements were tested: zinc phosphate cement (ZPC), glass-ionomer cement (GIC), self-adhesive resin-based cement (SRC) and resin-based cement (RC). RC was used in both dual cure mode (RC-D) and chemical cure mode (RC-C). First, the compressive strength of each cement was tested according to a standard (ISO 9917-1:2004). Second, load-to-failure test was performed to analyze the crown fracture resistance. CAD/CAM-produced monolithic zirconia crowns with a minimal thickness of 0.5 mm were prepared and cemented to dies with each cement. The crown-die samples were loaded until fracture. Results The compressive strength of SRC, RC-D and RC-C was significantly higher than those of ZPC and GIC (p < 0.05). However, there was no significant difference in the fracture load of the crown between the groups. ConclusionThe values achieved in the load-to-failure test suggest that monolithic zirconia crowns with a minimal thickness of 0.5 mm may have good resistance against fracture regardless of types of cements.

 

PMCID: PMC4894086 Free PMC Article
PMID: 27335900 [PubMed] 1. Acta Biomater Odontol Scand. 2016 Jan 1;2(1):12-19. Epub 2016 Jan 26.

Category: Compressive Strength and Flexual Strength

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