IADR Abstract Archives
Flexural Strength Comparison of Gradient Technology Zirconium Oxide
Objectives: This study investigated the flexural strength of IPS e.max® ZirCAD® Prime, which uses a new Gradient Technology to combine 3Y-TZP and 5Y-TZP oxide ceramic powders. We tested the flexural strength of this new material in order to determine if this Gradient Technology provides comparable strength and fracture toughness to other traditional of monolithic zirconium oxide products.
Methods: Test bars (N=20) of three materials: IPS e.max® ZirCAD® Prime (Ivoclar Vivadent, Amherst, NY); IPS e.max ZirCAD (Ivoclar); and KATANA™ Zirconia (Kuraray Noritake, Houston, TX) were made using a string saw with a diamond impregnated wire blade (South Bay Technology Inc, Model 850, San Clemente, CA). The bars were sintered in an oven (Ivoclar Programat S1 1600). Flexural strength was measured using a 3-point bending test on an Electropuls E-3000 (Instron, Norwood, MA) at a cross head speed of 0.5mm/min (span length=10mm, ISO-6872). The ultimate load at specimen fracture and modulus of elasticity were recorded and averages and standard deviation values were calculated. Analysis of variance (ANOVA) was used to statistically compare the flexural strength across the three materials (α=0.05).
Results: Results are shown in Table 1. ZirCAD® Prime had a higher absolute flexure strength compared to the traditional monolithic zirconium oxides; however, the differences failed to reach statistical significance. The modulus of elasticity for ZirCAD® Prime was similar to that of the other two materials tested with no statistically significant differences, however, the KATANA™ Zirconia bars had a significantly lower modulus when compared to ZirCAD.
Conclusions: Even with the addition of the Gradient Technology to their traditional Zirconia product, there was no significant difference between the flexural strength of the three types of zirconia materials (p = 0.4530). This suggests that the clinical application of ZirCAD® Prime is indicated for any full coverage restoration that requires high strength with the added benefit of increased esthetics.
Methods: Test bars (N=20) of three materials: IPS e.max® ZirCAD® Prime (Ivoclar Vivadent, Amherst, NY); IPS e.max ZirCAD (Ivoclar); and KATANA™ Zirconia (Kuraray Noritake, Houston, TX) were made using a string saw with a diamond impregnated wire blade (South Bay Technology Inc, Model 850, San Clemente, CA). The bars were sintered in an oven (Ivoclar Programat S1 1600). Flexural strength was measured using a 3-point bending test on an Electropuls E-3000 (Instron, Norwood, MA) at a cross head speed of 0.5mm/min (span length=10mm, ISO-6872). The ultimate load at specimen fracture and modulus of elasticity were recorded and averages and standard deviation values were calculated. Analysis of variance (ANOVA) was used to statistically compare the flexural strength across the three materials (α=0.05).
Results: Results are shown in Table 1. ZirCAD® Prime had a higher absolute flexure strength compared to the traditional monolithic zirconium oxides; however, the differences failed to reach statistical significance. The modulus of elasticity for ZirCAD® Prime was similar to that of the other two materials tested with no statistically significant differences, however, the KATANA™ Zirconia bars had a significantly lower modulus when compared to ZirCAD.
Conclusions: Even with the addition of the Gradient Technology to their traditional Zirconia product, there was no significant difference between the flexural strength of the three types of zirconia materials (p = 0.4530). This suggests that the clinical application of ZirCAD® Prime is indicated for any full coverage restoration that requires high strength with the added benefit of increased esthetics.