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M1 step 3 of 6 · Round-end tapered diamond
Add functional cusp bevel
Bevel the buccal (functional) cusps and blend the bevel into the occlusal reduction without a step.
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
- It keeps the metal from going thin where the opposing teeth hit.
- Watch
- The bevel is read with the occlusal reduction, inside the same band.
After the lesson: Retake the photos and score again on the 5 checkpoints.
Sources and 3D credits
Sources: 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 3: Add functional cusp bevel
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
WHYIt keeps the metal from going thin where the opposing teeth hit.
Do
Bevel the buccal (functional) cusps and blend the bevel into the occlusal reduction without a step.
WatchThe bevel is read with the occlusal reduction, inside the same band.
Sources: 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.