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M1 step 2 of 6 · Round-end tapered diamond
Reduce occlusal table following anatomy
Join the depth grooves, following the cusp inclines and grooves so the reduced table keeps the shape of the tooth.
Your last prep
No prep scored yet. Your first score is free with an account.
Score a prep free- Target
- Occlusal reduction: 1.0–2.0 mm
- Why
- Even reduction gives the crown room everywhere, not only in the centre.
- Watch
- A flat table is often thin under the cusp tips.
After the lesson: Retake the photos and score again on the 5 checkpoints.
Check 1 of 1 · Occlusal reduction
Which occlusal reduction is in the acceptable band?
Sources and 3D credits
Sources: Crown-prep criteria sheet, zirconia molar (#3), 2026–27 season, pp. 1–2 (checked 2026-10-28) · Cast-metal crown criteria sheet, 2025 season, criteria page (checked 2026-11-11)
3D model: molar30.glb: teeth #29–#31, jaw bone and gum. BodyParts3D, © 2008 Life Science Integrated Database Center (DBCLS); modified by Osler Press. CC BY-SA 2.1 JP · source
3D viewer code. three.js authors. MIT · source
3D viewer code. three.js authors. MIT · source
Step 2: Reduce occlusal table following anatomy
No prep scored yet · target 1.0–2.0 mm
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TOOLRound-end tapered diamond
CHECKPOINTOcclusal reduction: 1.0–2.0 mm
WHYEven reduction gives the crown room everywhere, not only in the centre.
Do
Join the depth grooves, following the cusp inclines and grooves so the reduced table keeps the shape of the tooth.
WatchA flat table is often thin under the cusp tips.
Check 1 of 1 · Occlusal reduction
Which occlusal reduction is in the acceptable band?
Sources: Crown-prep criteria sheet, zirconia molar (#3), 2026–27 season, pp. 1–2 (checked 2026-10-28) · Cast-metal crown criteria sheet, 2025 season, criteria page (checked 2026-11-11)
3D model: molar30.glb: teeth #29–#31, jaw bone and gum. BodyParts3D, © 2008 Life Science Integrated Database Center (DBCLS); modified by Osler Press. CC BY-SA 2.1 JP · source
3D viewer code. three.js authors. MIT · source
3D viewer code. three.js authors. MIT · source
Outline · 8 parts
✓Criteria card✓Anatomy in 3D3Steps1Depth-orient occlusal grooves2Reduce occlusal table following anatomy3Add functional cusp bevel4Axially reduce walls5Open proximal surfaces with guarded bur6Finish continuous chamfer and verify clearance with putty index4Within vs outside5Check6Guided cut7Cut and score8Recall: day 3 and day 10Practice feedback against the 2026–27 published crown-prep criteria (molar). Not an exam or admissions result; your program and examiners decide.