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USC 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
교합면 삭제량(occlusal reduction)교합면 전체를 고르게 삭제
1.0–2.0 mm
2
축면 테이퍼(axial taper)삽입로에서 본 각 축벽의 기울기
측벽당 12° 이하
3
변연 및 선각(margin and line angles)치경부 변연 폭; 매끄럽고 연속적이며 둥근 선각
0.5–1.5 mm
4
인접치아(adjacent tooth)이웃 치아에 접촉이나 손상 없음
접촉 없음
5
퍼티 간격(putty clearance)크라운이 들어갈 간격, 분할한 퍼티 인덱스에서 판정
1.0 mm 이상

What USC published

Herman Ostrow School of Dentistry of USC · Advanced Standing Program for International Dentists · CA, US. Program page

Procedures
Short practical examination in fixed prosthodontics and operative dentistry
Source: dentistry.usc.edu · read
Clock
not published
The school's own page does not list it (read ).
Teeth
not published
The school's own page does not list it (read ).

USC's published task list does not name a crown preparation; the crown prep checkpoints are practice for the hand-skills part only.

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 4단계: 축벽
강의
Reference molar model: adjacent tooth, within the bands
M1 4단계: 축면 삭제
무료 강의

Frequently asked questions

Is this the official USC scoring?

No. OslerPress is practice feedback against the 2026–27 published crown-prep criteria (molar), not Herman Ostrow School of Dentistry of USC'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 › USC bench test

USC 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
교합면 삭제량(occlusal reduction)교합면 전체에 고르게
1.0–2.0 mm
2
축면 테이퍼(axial taper)삽입로(line of draw) 기준, 측벽마다
측벽당 12° 이하
3
변연 및 선각(margin and line angles)매끄럽고 끊김 없는 둥근 형태
0.5–1.5 mm
4
인접치아(adjacent tooth)접촉∙손상 없음
접촉 없음
5
퍼티 간격(putty clearance)퍼티 인덱스(putty index)에서 확인한 여유 공간
1.0 mm 이상

What USC published

Herman Ostrow School of Dentistry of USC · Advanced Standing Program for International Dentists · CA, US. Program page

Procedures
Short practical examination in fixed prosthodontics and operative dentistry
Source: dentistry.usc.edu · read
Clock
not published
The school's own page does not list it (read ).
Teeth
not published
The school's own page does not list it (read ).

USC's published task list does not name a crown preparation; the crown prep checkpoints are practice for the hand-skills part only.

Fix the weakest checkpoint

Reference molar model: adjacent tooth, within the bands
M2 4단계: 축벽
강의
Reference molar model: adjacent tooth, within the bands
M1 4단계: 축면 삭제
무료 강의

Frequently asked questions

Is this the official USC scoring?

No. OslerPress is practice feedback against the 2026–27 published crown-prep criteria (molar), not Herman Ostrow School of Dentistry of USC'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.