Preparation Inlay preparations: ≥1.5mm occlusal reduction Isthmus ≥2mm

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Presentation transcript:

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

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

6° flare

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

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

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

Flat (no lip) ≥1.2mm ≥1.2mm ≥1.2mm

≥2mm Flat, parallel planes

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

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

≥1.5mm ≥2mm ≥2mm

Flat & parallel Height of contour Smooth transition

≥1.2mm ≥1.2mm ≥1.2mm ≥1.2mm