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Biaxial flexural strength of ceramic veneering techniques to yttria-tetragonal zirconia polycrystalline

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Original Article

Author Details : Niwut Juntavee, Nguyen Thi Minh Hien, Supaporn Chatrchiwiwatana

Volume : 3, Issue : 1, Year : 2017

Article Page : 16-24

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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 (Z_z), inCoris TZI (Z_i), Cercon (Z_c)) and randomly veneered with either a conventional layering technique, using IPS e.max Ceram (P_c), heat-pressed technique using IPS e.max Zirpress (P_h), and Cad-fused veneering technique using IPS e.max CAD (P_f). 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: Z_zP_c= 623.07±62.07, 11.11; Z_iP_c= 643.97±63.83, 11.30; Z_cP_c= 612.07±70.24, 9.50; Z_zP_h= 660.34±63.6, 11.20; Z_iP_h= 693.13±65.81, 11.69; Z_cP_h= 683.88±61.72, 12.18; Z_zP_f= 935.64±62.37, 16.41; Z_iP_f= 857.34±62.31, 14.98; Z_cP_f=721.34±58.67, 13.79. The flexural strength was significantly affected for different types of zirconia and veneering techniques (p<0.05). The CAD-fused veneering technique indicated significantly higher flexural strength than the others (p<0.05). Flexural strengths upon using IPS e.max ZirCAD were significantly higher than Cercon (p<0.05), but comparable to inCoris TZI (p>0.05).
Conclusions: The IPS emax ZirCAD and CAD-fused veneering technique were capable of providing high flexural strength for ceramic veneering zirconia.

Keywords: Flexural strength, Zirconia, Veneering technique

How to cite : Juntavee N, Hien N T M, Chatrchiwiwatana S, Biaxial flexural strength of ceramic veneering techniques to yttria-tetragonal zirconia polycrystalline. IP Ann Prosthodont Restor Dent 2017;3(1):16-24

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