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Photograph the prep on the grid card
Print the grid card at 100% and check the 50 mm bar with a ruler. Take three photos, occlusal, buccal and lingual, with the tooth centred and all four corner squares in the frame. The buccal photo shows the sectioned putty index seated on the prep.
No prep scored yet. Your first score is free with an account.
Score a prep free- Target
- Putty clearance: ≥ 1.0 mm
- Why
- The 1 mm grid turns the photo into millimetres; putty clearance is read on the buccal photo.
- Watch
- A corner square out of frame and the photo cannot be measured.
After the lesson: Retake the photos and score again on the 5 checkpoints.
Sources and 3D credits
3D viewer code. three.js authors. MIT · source
Loading 3D view…
Print the grid card at 100% and check the 50 mm bar with a ruler. Take three photos, occlusal, buccal and lingual, with the tooth centred and all four corner squares in the frame. The buccal photo shows the sectioned putty index seated on the prep.
WatchA corner square out of frame and the photo cannot be measured.
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.