SIU 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
Email only. 3 photos: occlusal, buccal, lingual.
The 5 checkpoints
What SIU published
Southern Illinois University School of Dental Medicine · International Advanced Placement Program (IAPP) · IL, US. Program page
- Procedures
- Selected from: posterior amalgam preparation, posterior full cast crown preparation, removable partial denture design, endodontic anterior access preparation, anterior Class III cavity preparation, Class II amalgam restoration, Class III/IV composite restoration, fixed partial denture preparation and provisionalSource: www.siue.edu · read
- Clock
- Bench examination scheduled 1:30 pm to 4:30 pm (3 h window)Source: www.siue.edu · read
- Teeth
- Dentoforms (Acadental ModuPROs)Source: www.siue.edu · read
SIU lists a crown preparation in its bench test, so the crown prep score below applies to it.
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
Frequently asked questions
Is this the official SIU scoring?
No. OslerPress is practice feedback against the 2026–27 published crown-prep criteria (molar), not Southern Illinois University School of Dental Medicine'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.
SIU 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.
Score my first prep freeThe 5 checkpoints
What SIU published
Southern Illinois University School of Dental Medicine · International Advanced Placement Program (IAPP) · IL, US. Program page
- Procedures
- Selected from: posterior amalgam preparation, posterior full cast crown preparation, removable partial denture design, endodontic anterior access preparation, anterior Class III cavity preparation, Class II amalgam restoration, Class III/IV composite restoration, fixed partial denture preparation and provisionalSource: www.siue.edu · read
- Clock
- Bench examination scheduled 1:30 pm to 4:30 pm (3 h window)Source: www.siue.edu · read
- Teeth
- Dentoforms (Acadental ModuPROs)Source: www.siue.edu · read
SIU lists a crown preparation in its bench test, so the crown prep score below applies to it.
Fix the weakest checkpoint
Frequently asked questions
Is this the official SIU scoring?
No. OslerPress is practice feedback against the 2026–27 published crown-prep criteria (molar), not Southern Illinois University School of Dental Medicine'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.
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.