Flexural strength of Y-TZP blocks used as core ceramic materials
Date
2008
DOI
Authors
Rowaihy, Tariq
Version
OA Version
Citation
Abstract
Statement of problem: All-ceramic restorative core materials for fixed partial denture prostheses have different structures and chemical compositions. Most of the studies compared Y-TZP core ceramic materials to non-zirconia ceramic substructure.
Objectives: The aim of this study was to test the flexural strength of different Y-TZP core ceramic materials marketed by different manufacturers.
Materials and Methods: In this study, nine zirconia-based ceramic core materials were tested (table I). Each block was sectioned to fabricate bar-shaped specimens approximately 25 X 4 X 2 mm in dimensions. A total of 120 bars were sectioned and divided into 12 groups. Each group consists of 10 bars. The flexural strength of the bars was determined by using a 3-point bending test performed in a universal testing machine (Instron Model 4202; Instron Co., Canton, MA) with a crosshead speed of 0.5 mm/min, equipped with a full-scale load cell of 1 KN. Statistical analyses were performed by using one way ANOVA and Tukey HSD test for multiple comparisons. Secondary SEM images of fracture sites were also evaluated.
Results: The results of the ANOVA test revealed that there was a statistically significant difference of strengths among the groups (P[less than]0.00). The mean flexural strengths value for each group is as follow: group AYZ-55 (Vita) 890.17 MPa, group B YZ-40 (Vita) 907.03 MPa, group C Incoris (Sirona) 812.5, group D Z-block (Foundation Milling) 731.75, group E Z-block (PZL) 733.32, group F Z-block (Henry Schein) 815.18, group G Everst (Kavo) 714.47, group H Z-block (Glidewell lab.)752.59 , group I Lava (3M/ESPE) 848.23, group J Lava (3M/ESPE) 870.36, group K Cercon (Dentsply) 676.88, and group L Cercon (Dentsply) 723.35.
Conclusion: Vita YZ (Vita) core ceramic material recorded the highest mean flexural strength value (907.03 MPa), while Cercon (Dentsply) had the lowest mean flexural strength value (676.88 MPa).
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Thesis (MSD)--Boston University, Goldman School of Dental Medicine, 2008 (Dept. of Restorative Sciences and Biomaterials).
Includes bibliographical references: leaves 73-76.
Thesis (MSD)--Boston University, Goldman School of Dental Medicine, 2008 (Dept. of Restorative Sciences and Biomaterials).
Includes bibliographical references: leaves 73-76.
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This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.