Abstract :
Purpose: This study evaluated the influence of the different veneering technique to zirconia on biaxial flexural strength of ceramic bilayer.
Materials and Methods: Forty-five (45) disc-shape specimens (10 mm in ɸ, 0.5 mm thickness) were prepared from each zirconia (e.max ZirCAD (Zz), inCoris TZI (Zi), Cercon (Zc)) and randomly veneered with either a conventional layering technique, using IPS e.max Ceram (Pc), heat-pressed technique using IPS e.max Zirpress (Ph), and Cad-fused veneering technique using IPS e.max CAD (Pf). The bilayer specimens were adjusted and glazed to the final dimension (10±0.05 mm in ɸ, 1.5±0.01 mm in thickness). Piston on three balls method was used to determine the biaxial flexural strength at 0.5 mm/min cross-head speed. The loads to failure were recorded and calculated for biaxial flexural strengths using Hsueh formula. Data were analyzed through ANOVA, Bonferroni test, and Weibull analysis.
Results: The biaxial flexural strength (Mean±SD; MPa) and Weibull modulus (m) for each group were: ZzPc= 623.07±62.07, 11.11; ZiPc= 643.97±63.83, 11.30; ZcPc= 612.07±70.24, 9.50; ZzPh= 660.34±63.6, 11.20; ZiPh= 693.13±65.81, 11.69; ZcPh= 683.88±61.72, 12.18; ZzPf= 935.64±62.37, 16.41; ZiPf= 857.34±62.31, 14.98; ZcPf=721.34±58.67, 13.79. The flexural strength was significantly affected for different types of zirconia and veneering techniques (p
Keyword :
Flexural strength, Zirconia, Veneering technique