Skip to content
Osler PressEdu
Log inStart free
Schools › Western bench test

Western 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

1
Occlusal reductionEven reduction over the whole occlusal surface
1.0–2.0 mm
2
Axial taperLean of each axial wall from the line of draw
≤ 12° per wall
3
Margin and line anglesCervical margin width; smooth, continuous, rounded line angles
0.5–1.5 mm
4
Adjacent toothNo contact or damage to the neighbor
No contact
5
Putty clearanceRoom for the crown, read on the sectioned putty index
≥ 1.0 mm

What Western published

Western University, Schulich School of Medicine & Dentistry · Advanced Standing Program for International Dental Graduates (Bench Test) · ON, CA. Program page

Procedures
Each candidate is assigned any four of: one Class II amalgam preparation (any posterior tooth), one all-ceramic posterior crown preparation, one Class II amalgam restoration on a standard pre-prepared tooth, one Class II composite restoration on a standard pre-prepared tooth, rubber dam isolation
Source: www.schulich.uwo.ca · read
Clock
not published
The school's own page does not list it (read ).
Teeth
Typodont in manikin; posterior tooth (not further specified)
Source: www.schulich.uwo.ca · read

Western 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

Reference molar model: adjacent tooth, within the bands
M2 step 4: Axial walls
Lesson
Reference molar model: adjacent tooth, within the bands
M1 step 4: Axially reduce walls
Free lesson

Frequently asked questions

Is this the official Western scoring?

No. OslerPress is practice feedback against the 2026–27 published crown-prep criteria (molar), not Western University, Schulich School of Medicine & 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.

Schools › Western bench test

Western 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 free
Reference molar model, occlusal view of a scored prep
Not publishedbench-test clock
5checkpoints
Tooth #3school typodont
$9990 days, one payment

The 5 checkpoints

1
Occlusal reductionEven over the whole surface
1.0–2.0 mm
2
Axial taperEach wall from the line of draw
≤ 12° per wall
3
Margin and line anglesSmooth, continuous, rounded
0.5–1.5 mm
4
Adjacent toothNo contact or damage
No contact
5
Putty clearanceRoom read on the putty index
≥ 1.0 mm

What Western published

Western University, Schulich School of Medicine & Dentistry · Advanced Standing Program for International Dental Graduates (Bench Test) · ON, CA. Program page

Procedures
Each candidate is assigned any four of: one Class II amalgam preparation (any posterior tooth), one all-ceramic posterior crown preparation, one Class II amalgam restoration on a standard pre-prepared tooth, one Class II composite restoration on a standard pre-prepared tooth, rubber dam isolation
Source: www.schulich.uwo.ca · read
Clock
not published
The school's own page does not list it (read ).
Teeth
Typodont in manikin; posterior tooth (not further specified)
Source: www.schulich.uwo.ca · read

Western lists a crown preparation in its bench test, so the crown prep score below applies to it.

Fix the weakest checkpoint

Reference molar model: adjacent tooth, within the bands
M2 step 4: Axial walls
Lesson
Reference molar model: adjacent tooth, within the bands
M1 step 4: Axially reduce walls
Free lesson

Frequently asked questions

Is this the official Western scoring?

No. OslerPress is practice feedback against the 2026–27 published crown-prep criteria (molar), not Western University, Schulich School of Medicine & 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.

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.