What is the thickness of the preparation for zirconium dioxide all-ceramic teeth?
2025-03-19
The thickness of the preparation for zirconium dioxide all-ceramic teeth anterior crowns needs to be comprehensively designed according to the restoration site and functional requirements. The main reference standards are as follows:
1. Base crown thickness
Zirconium oxide base crown: Usually controlled at 0.5-0.6mm, because the zirconium oxide material has high strength, the thickness requirement is similar to that of the metal base crown.
2. Tooth preparation volume
Incisal end (occlusal surface)
The preparation thickness is 1.5-2.0mm, and a 45° bevel with the long axis of the tooth needs to be prepared to ensure the strength and beauty of the restoration.
Labial surface (outside of the anterior teeth)
Evenly grind 1.0-1.5mm, prepare in two sections of 1/3 of the incisal end and 2/3 of the neck to avoid sharp angles.
Lingual surface (inside of the anterior teeth)
Grind 0.5mm, if porcelain decoration is required, the preparation volume needs to be appropriately increased. Proximal surface
Reserve a gap of 1.0-1.2mm, and control the convergence angle at 2°-5°.
3. Shoulder requirements
The edge is located 0.5-1.0mm below the gingiva, and the shoulder width is recommended to be 0.5-0.6mm, which needs to be rounded without sharp corners.
4. Other considerations
Porcelain layer thickness: Need to be ≥1.2mm to ensure natural color and non-transparent bottom.
Overall design: The tooth preparation depth needs to reach 0.5-1.0mm below the enamel-cementum junction to ensure retention and stability.
Summary
The thickness of the prepared tooth for the anterior all-ceramic crown needs to be adjusted according to the specific restoration site:
Incisal tip: 1.5-2.0mm
Labial surface: 1.0-1.5mm
Lingual surface: 0.5mm
Base crown: 0.5-0.6mm
Shoulder: 0.5-0.6mm
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