title: Effect of cements on fracture resistance of monolithic zirconia crowns.
abstract: ObjectivesThe present study investigated the effect of cements on fracture resistance of monolithic zirconia crowns in relation to their compressive strength.Materials and methodsFour 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.ResultsThe 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.
authors.affiliation: Department 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.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Nakamura
authors.affiliation: Research Group for Biomaterials Used in Dentistry and Medicine, Department for Clinical Dentistry, Faculty of Health Sciences, the Arctic University of Norway , Tromsø , Norway.
authors.forename: Mathieu
authors.initials: M
authors.lastname: Mouhat
authors.affiliation: Research Group for Biomaterials Used in Dentistry and Medicine, Department for Clinical Dentistry, Faculty of Health Sciences, the Arctic University of Norway , Tromsø , Norway.
authors.forename: John Magnus
authors.initials: JM
authors.lastname: Nergård
authors.affiliation: Research Group for Biomaterials Used in Dentistry and Medicine, Department for Clinical Dentistry, Faculty of Health Sciences, the Arctic University of Norway , Tromsø , Norway.
authors.forename: Solveig Jenssen
authors.initials: SJ
authors.lastname: Lægreid
authors.affiliation: Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry , Sendai , Japan.
authors.forename: Taro
authors.initials: T
authors.lastname: Kanno
authors.affiliation: Department of Prosthetic Dentistry/Dental Materials Science, Institute of Odontology, University of Gothenburg , Gothenburg , Sweden.
authors.forename: Percy
authors.initials: P
authors.lastname: Milleding
authors.affiliation: Department 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.
authors.forename: Ulf
authors.initials: U
authors.lastname: Örtengren
keywords: Monolithic zirconia crowns; fracture resistance; glass-ionomer cement; resin-based cement; zinc phosphate cement