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✕›M0 step 4 of 6English한국어6 of 13Exit lesson
M0 step 4: Read the five checkpoints on a finished prep

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M0 step 4 of 6 · No bur

Read the five checkpoints on a finished prep

On the finished prep, read the checkpoints in the scoring order: occlusal reduction, axial taper, margin and line angles, adjacent tooth, putty clearance. Find each one on the criteria card.

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Target
Margin and line angles: 0.5–1.5 mm
Why
Every score, every replay link and every module uses this order.
Watch
The margin is read as a width at the finish line, not as a depth.

After the lesson: Retake the photos and score again on the 5 checkpoints.

Check 1 of 1 · Margin and line angles
Which cervical margin width is in the acceptable band?
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Sources and 3D credits
Sources: Crown-prep criteria sheet, zirconia molar (#3), 2026–27 season, pp. 1–2 (checked 2026-10-28) · Clinical candidate manual 2026–27, p. 13 (teeth), p. 14 (scoring overview), p. 16 (taper, line of draw) (checked 2026-10-28)
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
English한국어
✕M0 · Orientation6/13
Step 4: Read the five checkpoints on a finished prep
No prep scored yet · target 0.5–1.5 mm
M0 step 4: Read the five checkpoints on a finished prep

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TOOLNo bur
CHECKPOINTMargin and line angles: 0.5–1.5 mm
WHYEvery score, every replay link and every module uses this order.
Do

On the finished prep, read the checkpoints in the scoring order: occlusal reduction, axial taper, margin and line angles, adjacent tooth, putty clearance. Find each one on the criteria card.

Watch

The margin is read as a width at the finish line, not as a depth.

Check 1 of 1 · Margin and line angles
Which cervical margin width is in the acceptable band?
Sources: Crown-prep criteria sheet, zirconia molar (#3), 2026–27 season, pp. 1–2 (checked 2026-10-28) · Clinical candidate manual 2026–27, p. 13 (teeth), p. 14 (scoring overview), p. 16 (taper, line of draw) (checked 2026-10-28)
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
Outline · 8 parts✓Criteria card✓Anatomy in 3D3Steps1Find tooth #30 and tooth #32Name the five surfaces of #303Peel enamel, dentin and pulp4Read the five checkpoints on a finished prep5Photograph the prep on the grid card6Read your score band by band4Within vs outside5Check6Guided cut7Cut and score8Recall: day 3 and day 10

Practice feedback against the 2026–27 published crown-prep criteria (molar). Not an exam or admissions result; your program and examiners decide.

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