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Published byHerbert Bridges Modified over 9 years ago
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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
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Flat seat (no lip) Rounded ≥2mm ≥1.2mm
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6° flare
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― to 6° divergence ≥1.5mm ≥2mm 6° divergence
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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
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Preparation Onlay preparations: Working cusp reduction ≥2.0mm
Non-working cusp reduction ≥1.5mm Shoulder ≥1.2mm
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Flat (no lip) ≥1.2mm ≥1.2mm ≥1.2mm
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≥2mm Flat, parallel planes
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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
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Preparation Crown preparations: Working cusp reduction ≥2.0mm
Non-working cusp reduction ≥1.5mm Shoulder ≥1.2mm Rounded transitions
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≥1.5mm ≥2mm ≥2mm
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Flat & parallel Height of contour Smooth transition
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≥1.2mm ≥1.2mm ≥1.2mm ≥1.2mm
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