Grain size, crystalline phase and fracture toughness of the monolithic zirconia
Issued Date
2022-01-01
Resource Type
ISSN
20057806
eISSN
20057814
Scopus ID
2-s2.0-85142292247
Journal Title
Journal of Advanced Prosthodontics
Volume
14
Issue
5
Start Page
285
End Page
293
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Advanced Prosthodontics Vol.14 No.5 (2022) , 285-293
Suggested Citation
Bocam K., Anunmana C., Eiampongpaiboon T. Grain size, crystalline phase and fracture toughness of the monolithic zirconia. Journal of Advanced Prosthodontics Vol.14 No.5 (2022) , 285-293. 293. doi:10.4047/jap.2022.14.5.285 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/84464
Title
Grain size, crystalline phase and fracture toughness of the monolithic zirconia
Author(s)
Author's Affiliation
Other Contributor(s)
Abstract
PURPOSE. This study evaluated the relationship among translucency, crystalline phase, grain size, and fracture toughness of zirconia. MATERIALS AND METHODS. Four commercial zirconia - Prettau®Anterior® (PA), Prettau® (P), InCorisZI (ZI), and InCorisTZI (TZI)- were selected for this study. The bar specimens were prepared to determine fracture toughness by using chevron notched beam method with fourpoint bending test. The grain size was evaluated by a mean linear intercept method using a scanning electron microscope. X-ray diffraction and Rietveld refinement were performed to evaluate the amount of tetragonal and cubic phases of zirconia. Contrast ratio (CR) was measured to investigate the level of translucency. RESULTS. PA had the lowest fracture toughness among other groups (P <.05). In addition, the mean fracture toughness of P was significantly less than that of ZI, but there was no difference compared with TZI. Regarding grain size measurement, PA had the largest average grain size among the groups. P obtained larger grain size than ZI and TZI (P <.05). However, there was no significant difference between ZI and TZI. Moreover, PA had the lowest CR value compared with the other groups (P <.05). This means PA was the most translucent material in this study. Rietveld refinement found that PA presented the greatest percentage of cubic phase, followed by TZI, ZI, and P, respectively. CONCLUSION. The different approaches are used by manufacturers to fabricate various types of translucent zirconia with different levels of translucency and mechanical properties, which should be concerned for material selection for successful clinical outcome.