Journal article
Fracture toughness of yttria-stabilized zirconia sintered in conventional and microwave ovens
The Journal of prosthetic dentistry, Vol.109(3), pp.165-171
03/2013
DOI: 10.1016/S0022-3913(13)60037-2
PMID: 23522365
Abstract
The fabrication of zirconium dioxide (ZrO2) dental prosthetic substructures requires an extended sintering process (8 to 10 hours) in a conventional oven. Microwave sintering is a shorter process (2 hours) than conventional sintering.
The purpose of this study was to compare the fracture toughness of 3 mol % Y2O3-stabilized ZrO2 sintered in a conventional or microwave oven.
Partially sintered ZrO2 specimens from 3 manufacturers, KaVo, Lava 3M, and Crystal HS were milled (KaVo Everest engine) and randomly divided into 2 groups: conventional sintering and microwave sintering (n=16 per group). The specimens were sintered according to the manufacturers’ recommendations and stored in artificial saliva for 10 days. Fracture toughness was determined by using a 4-point bend test, and load to fracture was recorded. Mean fracture toughness for each material was calculated. A 2-way ANOVA followed by the Tukey HDS post hoc test was used to assess the significance of sintering and material effects on fracture toughness, including an interaction between the 2 factors (α=.05).
The 2-way ANOVA suggested a significant main effect for ZrO2 manufacturer (P<.001). The post hoc Tukey HSD test indicated that mean fracture toughness for the KaVo ZrO2 (5.85 MPa·m1/2 ±1.29) was significantly higher than for Lava 3M (5.19 MPa·m1/2 ±0.47) and Crystal HS (4.94 MPa·m1/2 ±0.66) (P<.05) and no significant difference was observed between Lava 3M and Crystal HS (P>.05). The main effect of the sintering process (Conventional [5.30 MPa·m1/2 ±1.00] or Microwave [5.36 MPa·m1/2 ±0.92]) was not significant (P=.76), and there was no interaction between sintering and ZrO2 manufacturer (P=.91).
Based on the results of this study, no statistically significant difference was observed in the fracture toughness of ZrO2 sintered in microwave or conventional ovens.
Details
- Title: Subtitle
- Fracture toughness of yttria-stabilized zirconia sintered in conventional and microwave ovens
- Creators
- Aristotelis Marinis - Clinical Assistant Professor, Department of Restorative Dentistry, College of Dentistry, University of Illinois, Chicago, IllSteven A Aquilino - Professor, Department of Prosthodontics, University of Iowa College of Dentistry, Iowa City, IowaPeter S Lund - Clinical Associate Professor, Department of Prosthodontics, University of Iowa College of Dentistry, Iowa City, IowaDavid G Gratton - Associate Professor, Department of Prosthodontics, University of Iowa College of Dentistry, Iowa City, IowaClark M Stanford - Associate Dean for Research, and Centennial Fund Professor, Dows Institute for Dental Research, University of Iowa College of Dentistry, Iowa City, IowaAna M Diaz-Arnold - Professor, Department of Family Dentistry, University of Iowa College of Dentistry, Iowa City, IowaFang Qian - Associate Research Scientist and Adjunct Assistant Professor, Dows Institute for Dental Research, University of Iowa College of Dentistry, Iowa City, Iowa
- Resource Type
- Journal article
- Publication Details
- The Journal of prosthetic dentistry, Vol.109(3), pp.165-171
- DOI
- 10.1016/S0022-3913(13)60037-2
- PMID
- 23522365
- NLM abbreviation
- J Prosthet Dent
- ISSN
- 0022-3913
- eISSN
- 1097-6841
- Publisher
- Mosby, Inc
- Language
- English
- Date published
- 03/2013
- Academic Unit
- Preventive and Community Dentistry; Prosthodontics; Orthopedics and Rehabilitation; Craniofacial Anomalies Research Center; Oral and Maxillofacial Surgery; Family Dentistry; Dental Research; Hospital Dentistry
- Record Identifier
- 9984065704402771
Metrics
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