ZrO2 dental material Zirkon ST

zirconium dioxidezirconiafor dental crowns

Product overview
The super translucent zirconium dioxide guarantees excellent aesthetic results, especially in the posterior region, and offers additional benefits: high translucency for natural aesthetics in fully anatomical crowns and bridges and high material strength enabling production of larger bridge frames. CAD/CAM products made of BEGO Zirkon ST are available as precolored blanks in 16 VITA classical shades. BEGO Zirkon ST Multi are pre-colored blanks with a shade gradient. The realization of thin-tapered crown margins reduces finishing work considerably. Restorations can be veneered with all standard veneering ceramics suitable for zirconium dioxide. For fully anatomical restorations, finishing can be performed by polishing and/or glaze firing with stain.

Key benefits

• Ultimate strength meets outstanding translucency
• Outstanding aesthetic results
• Consistent shade accuracy and reproducibility thanks to precolored blanks in 16 VITA classical shades (BEGO Zirkon ST Multi also available with color gradient)
• For fully anatomical or reduced crowns and bridges for classical veneering and partial layering up to maximum-length restorations
• Production of bridge frames with up to 16 units and up to two adjacent pontics

Indications

• Fully anatomical crowns and bridges in anterior and posterior regions with up to 16 units and a maximum of two pontics
• Bridge frames for partially and fully veneered solutions in anterior and posterior regions with up to 16 units and a maximum of two pontics
• Inlays / Onlays / Veneers
• Telescopic primary crowns
• Dentine core crowns and bridges

Contraindications

• Tangential preparation
• Chamfer preparation with a circular rising preparation margin (“guttering effect”)
• All-ceramic restoration if minimal clinical requirements for available space and preparation shape are not satisfied

Recommendations for shade selection
The shade effect of BEGO Zirkon ST Multi (gradient blanks) is significantly influenced by wall thickness. Thinly designed frameworks appear significantly brighter (up to two tooth shades) than the selected shade. For posterior restorations, choose one shade darker than the target to match surrounding teeth. Glazing and polishing produce different outcomes: for glazing, select the target shade; for polishing, the result tends to be one shade darker, so select one lighter shade if polishing is intended.

Technical data
Chemical composition: ZrO2 + HfO2 + Y2O3 — ≥ 99.5 % by weight
Yttrium oxide (Y2O3): 6.9 % by weight
Aluminum oxide (Al2O3): 0.05 % by weight
Sum of all other oxides: ≤ 1.5 % by weight

Physical material data: Density: 6.06 g/cm3
Strength (biaxial): > 1,000 MPa
Vickers hardness (HV 1): 1,250 MPa
Translucency: 45 %
Coefficient of thermal expansion (RT – 600 °C): 10.8 x 10^-6 K^-1
Grain size: < 0.5 μm

Chemical solubility: Acetic acid 4 % solution in water (quality 3 as per ISO 6872): ≤ 50 μg/cm2

Additional notes
Thin-tapered crown margins reduce finishing work. Follow instructions for use of veneering material manufacturers.

Technical specifications

• Brand: BEGO
• Product types: BEGO Zirkon ST (precolored blanks, 16 VITA shades) and BEGO Zirkon ST Multi (gradient precolored blanks)
• Chemical composition: ZrO2 + HfO2 + Y2O3 (≥ 99.5 % by weight); Y2O3 = 6.9 %
• Density: 6.06 g/cm3
• Biaxial strength: > 1,000 MPa
• Vickers hardness (HV 1): 1,250 MPa
• Translucency: 45 %
• Coefficient of thermal expansion (RT – 600 °C): 10.8 x 10^-6 K^-1
• Grain size: < 0.5 μm
• Chemical solubility (ISO 6872): ≤ 50 μg/cm2 (acetic acid 4 %)
• Indications: crowns, bridges (up to 16 units, max two pontics), inlays/onlays/veneers, telescopic primary crowns