GENERAL 

• Ensure all walls end in butt margin. No flared or feather edge margins.
• Enamel surfaces created by parallel preparation generally sufficient for acid etching with flat cusps; diverging preparation helps optimize etching of the enamel.
• Preparation margins must not be located on functional or abrasion surfaces.

 INLAYS/ONLAYS 

Inlay Preparation

Technique Tips

• Ensure all walls end in a butt margin. No flared or feather edge margins.
• Enamel surfaces created by parallel preparation are generally sufficient for acid etching with flat cusps; a diverging preparation helps optimize acid etching of the enamel.
  

Avoid sharp internal line angles and undercuts. Smooth prep walls and trim excess lining material with finishing diamond or bur Do not include undercuts Create a 5º to 15º divergence in the proximal walls from the floor to the occlusal margin of the preparation.

Onlay Preparation

Avoid sharp internal line angles and undercuts. With onlays, cuspal reduction of a minimum of 1.5 mm is required. Smooth prep walls and trim excess lining material with finishing diamond or bur. Do not include undercuts. Create a 5º to 15º divergence in the proximal walls from the floor to the occlusal margin of the preparation. Ensure all walls end in a butt margin.

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