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M0 step 2 of 6 · Probe or marker, mouth mirror
Name the five surfaces of #30
Touch and name occlusal, buccal, lingual, mesial and distal on #30. Use the mirror to see the lingual and distal surfaces you cannot see straight on.
Your last prep
No prep scored yet. Your first score is free with an account.
Score a prep free- Target
- Axial taper: ≤ 12° per wall
- Why
- Taper is read per wall, and each wall is named by its surface.
- Watch
- Mesial faces the midline, so on #30 it faces #29.
After the lesson: Retake the photos and score again on the 5 checkpoints.
Check 1 of 1 · Axial taper
How is axial taper read?
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
3D viewer code. three.js authors. MIT · source
Step 2: Name the five surfaces of #30
No prep scored yet · target ≤ 12° per wall
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TOOLProbe or marker, mouth mirror
CHECKPOINTAxial taper: ≤ 12° per wall
WHYTaper is read per wall, and each wall is named by its surface.
Do
Touch and name occlusal, buccal, lingual, mesial and distal on #30. Use the mirror to see the lingual and distal surfaces you cannot see straight on.
WatchMesial faces the midline, so on #30 it faces #29.
Check 1 of 1 · Axial taper
How is axial taper read?
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
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 10Practice feedback against the 2026–27 published crown-prep criteria (molar). Not an exam or admissions result; your program and examiners decide.