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Preparation

Preparation

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Preparation

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  1. Preparation Inlay preparations: • ≥1.5mm occlusal reduction • Isthmus ≥2mm • Wall divergence: ― to +6° • Gingival seat ≥1.2mm & flat • Box: wall flare 6° • Pulpal/axial line angle: rounded

  2. Flat seat (no lip) Rounded ≥2mm ≥1.2mm

  3. 6° flare

  4. ― to 6° divergence ≥2mm ≥1.5mm 6° divergence

  5. Gentle curves Must fit the diameter of 1.6mm or 1.2mm milling diamond

  6. Preparation Onlay preparations: • Working cusp reduction ≥2.0mm • Non-working cusp reduction ≥1.5mm • Shoulder ≥1.2mm

  7. Flat (no lip) ≥1.2mm ≥1.2mm ≥1.2mm

  8. ≥2mm Flat, parallel planes

  9. Gentle curve to fit 1.6 or 1.2 milling diamond Smooth, straight flares Flat, 1.2mm Gentle curve to margin Flat floor parallel to camera face

  10. Preparation Crown preparations: • Working cusp reduction ≥2.0mm • Non-working cusp reduction ≥1.5mm • Shoulder ≥1.2mm • Rounded transitions

  11. ≥1.5mm ≥2mm ≥2mm

  12. Flat & parallel Height of contour Smooth transition

  13. ≥1.2mm ≥1.2mm ≥1.2mm ≥1.2mm