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UNC bench test: what the crown prep is scored on

Five checkpoints on tooth #3 on a school typodont, measured against the 2026–27 published crown-prep criteria. Practice yours here and see which checkpoint to fix first.

Score my first prep free Read the criteria

Not publishedbench-test clock

5checkpoints, fixed order

Tooth #3school typodont

$9990 days, one payment

Reference molar model, occlusal view of a scored prep

Your first score is freeScore my first prep free

Email only. 3 photos: occlusal, buccal, lingual.

The 5 checkpoints

Occlusal reductionEven reduction over the whole occlusal surface

1.0–2.0 mm

Axial taperLean of each axial wall from the line of draw

≤ 12° per wall

Margin and line anglesCervical margin width; smooth, continuous, rounded line angles

0.5–1.5 mm

Adjacent toothNo contact or damage to the neighbor

No contact

Putty clearanceRoom for the crown, read on the sectioned putty index

≥ 1.0 mm

What UNC published

University of North Carolina at Chapel Hill, Adams School of Dentistry · Advanced Standing for International Dentists (ASPID) · NC, US. Program page

Procedures: not published
The school's own page does not list it (read 2026-10-28).
Clock: not published
The school's own page does not list it (read 2026-10-28).
Teeth: Manikins in the preclinical laboratory (no specific tooth named)
Source: dentistry.unc.edu · read 2026-10-28

UNC has not published its task list; practice the crown prep and check with the program.

How scoring works

Each checkpoint is measured from your photos and shown as within or outside, in numbers, in the same fixed order every time. The numbers come from the 2026–27 crown-prep criteria sheet for a molar (criteria sheet, read 2026-11-14): taper up to 12° per wall adheres, over 12° to 16° per wall is marginally substandard, over 16° per wall is critically deficient.

Fix the weakest checkpoint

Reference molar model: adjacent tooth, within the bands

M2 step 4: Axial walls

Lesson

M1 step 4: Axially reduce walls

Free lesson

Frequently asked questions

Is this the official UNC scoring?

No. OslerPress is practice feedback against the 2026–27 published crown-prep criteria (molar), not University of North Carolina at Chapel Hill, Adams School of Dentistry's own grading. Your program and examiners decide.

What do I photograph?

Three photos of your prep on the typodont: occlusal, buccal and lingual, same light and distance, plus the sectioned putty index.

What happens at my second scored prep?

Your first score is free with an account. The second asks for $99 for 90 days, one payment, no auto-renew, 14-day refund.

Can my class use it?

Yes. Faculty create a class code free; students join with it and the $149/yr seat unlocks the full library.