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Mechanical Properties of 3Y-TZP Zirconia: Spark Plasma-Sintering VS. Conventional Method
Mechanical Properties of 3Y-TZP Zirconia: Spark Plasma-Sintering VS. Conventional Method Öykü Ceren Kahraman, Koray Soygun, Burak Demir Purpose: The purpose of this in-vitro study was to evaluate and compare the mechanical properties of zirconium dioxide polycrystalline ceramics sintered by Spark Plasma Sintering and conventional method. Materials and Methods: A total of 20 specimens were evaluated by two different sintering protocols. The control group (S0) specimens were milled from pre-sintered zirconia discs with 3Y-TZP structure by Cerec Systems(Dentsply Sirona, USA). S0 specimens were sintered by the traditional method (1450oC, 9 hours ; n=10). The experimental group (S3) were evaluated from zirconia powders with %3 yttrium-oxide content by Spark Plasma Sintering(FCT GmbH, HPD- 50, Germany) method (final temperature 1300oC, 5 min. ; n=10). All specimens were fabricated with a diameter of 20 mm and thickness of 2.0 ± 0.2 mm. For each group, the specimens were tested to compare their biaxial flexural strenght (ISO Standart 6872) using universal testing machine(Testometric, Lancashire, UK). The specimens were also submitted to Vickers hardness (on polished and as-received surfaces within the same specimen). The data were analyzed with 1-way ANOVA and/ or Kruskall Wallis tests(α=0,05). And the necessary Bonferroni corrections were made for multiple comparisons. Results: Biaxial flexural strength of S0 and S3 were min. 34,46- max. 71,02 MPa, min. 69,32-max 161,98 MPa, respectively, and were statistically different (P≤ 0.05). The Vickers hardness number of control group(S0) was 980 ± 41, whereas hardness values for experimental group(S3) was 1355 ± 144, respectively, and were statistically different (P≤ 0.05). Conclusion: The Spark Plasma Sintering method can be performed in much shorter times than the traditional sintering method. We think that in our study, we will shed light on in-vitro and in-vivo studies on the comparison of methods and the development of methods and contribute to the literature.