FAQ about Dental Zirconia Discs

Dental Zirconia Discs widely used in full crowns, bridges, implant restorations, etc.

Fracture or chipping of Dental Zirconia Discs restorations

1.Problem manifestation

Dental Zirconia Discs base fracture (rare but possible).

Cracking of the veneer porcelain layer (more common in Dental Zirconia Discs-veneer porcelain double-layer structure).

2.Possible causes

Material factors:

Incomplete sintering or insufficient crystallization of Dental Zirconia Discs (such as sintering procedure errors).

The thermal expansion coefficient of veneer porcelain and Dental Zirconia Discs does not match (the main reason for the chipping of veneer porcelain).

Design factors:

Insufficient thickness of the restoration (especially the occlusal surface or connector area).

Sharp angles or stress concentration design (such as the bridge connection is not rounded).

Clinical factors:

Too tight bite or nocturnal bruxism is not intervened.

Incomplete positioning during bonding leads to excessive local stress.

3.Solution

Material selection:

High-transparency Dental Zirconia Discs (such as 3Y-TZP or 5Y-TZP) is used for anterior teeth, and high-strength Dental Zirconia Discs (such as 4Y-TZP) is used for posterior teeth.

Design optimization:

Ensure the minimum thickness: single crown ≥0.5mm (anterior teeth), ≥0.7mm (posterior teeth); bridge connector ≥4mm².

Use CAD/CAM software for finite element stress analysis to avoid sharp angle design.

Clinical treatment:

Grind the sharp cusps of the opposing teeth and make bite pads.

Use resin-modified glass ionomer cement during bonding to enhance fracture resistance.