Some US and Canadian programmes put a hands-on bench test inside the interview. You work on a typodont under time, and at some schools you are asked to narrate what you are doing while you work. Your clinical experience is the foundation, but it is not the thing being scored. This page sets out the procedures, the criteria, the mistakes and a four-week practice protocol.
What a bench test actually is
A timed, hands-on evaluation on a dental mannequin, run as part of the interview at some US and Canadian programmes.
You perform a procedure on a typodont, which is a mannequin with removable teeth, usually inside 60 to 90 minutes. Some programmes also ask you to talk through what you are doing as you work, which means your communication is being assessed at the same time as your hands.
Most internationally trained dentists assume years of clinical practice make this straightforward. It does not. A bench test is not asking whether you can do dentistry. It is asking whether you can show precision, technique and professionalism under structured evaluation conditions, against criteria you have probably never been marked on before.
The three procedures that come up most
Tap a procedure to see what you will be asked to do and what is scored in it.
The most frequently tested procedure across programmes. You prepare a mesio-occlusal or disto-occlusal cavity on a posterior tooth.
A tooth prepared for a porcelain-fused-to-metal crown. The evaluation turns on getting enough reduction for both the metal substructure and the porcelain, with a finish line that stays readable.
A tooth prepared for a full cast gold crown. Gold needs less reduction overall than a PFM, but it is less forgiving about where the margin sits.
The six criteria, whichever procedure you get
Schools weigh these differently, but almost all of them score on these six dimensions.
Margin placementClean, well-defined margins in the correct position. Most schools expect the crown margin to sit about 0.5 to 1 mm above the gingival contour, and the habit that ruins it is polishing it smooth at the very end.
Taper and convergenceThe right angulation for the procedure. Over-taper and too-parallel have the same root cause: no fixed reference point, so the handpiece angle drifts.
Depth controlAppropriate pulpal, axial or occlusal depth throughout. Graders do not only read your index, they compare against the adjacent tooth, so verify it two ways.
Surface smoothnessNo gouges, no chattering, no rough internal surfaces. Smoothness is produced while you cut, not by polishing at the end.
Time managementFinishing inside the allotted time without rushing. Most candidates lose time in the middle and rush the finish, which is where the visible marks are.
Infection control awarenessInstrument handling, glove changes and a clean field. It is watched even when it is not announced.
A fuller breakdown is in how the bench test is graded.
Which criterion is costing you most?
Pick the one you know is weakest and get the drill for it.
Stop finishing the margin by polishing it
The usual pattern is a margin that looks nearly right, then gets polished repeatedly until it looks perfect. Each pass takes a little more tooth, pushes the margin closer to the gingiva and leaves it rougher rather than smoother. That is two losses from one habit.
Cut the margin to its final position and finish early, then leave it alone. Check where it sits relative to the gingival contour before you touch it again.
Taper drifts when nothing is holding the angle
Over-tapered and too-parallel preparations come from the same place: not knowing the correct handpiece angulation, or working without a fixed reference. Bridge preparations are where the too-parallel version shows up most, usually while chasing a result that looks perfect.
Decide what you are referencing before the bur touches the tooth, then check against it, not against how the preparation looks from wherever you happen to be sitting.
Depth is the most common failure cause
It usually comes down to the reduction guidelines not being known or not being followed. Graders can judge depth without your index, simply by comparing with the adjacent tooth.
Learn the numbers for the preparation you are cutting, then verify them two ways: your own index, and a direct comparison against the adjacent tooth.
Time is a criterion, so practise it like one
Almost every candidate who runs out of time found out too late. The pattern is losing minutes in the middle and then rushing the last part of the exercise, which is exactly where the visible marks are.
Set the timer from your first practice session, and check the clock at the halfway mark rather than near the end, while there is still time to change pace.
Smoothness is built while you cut
Chatter and gouging usually come from unsupported hand position or from a bur being pushed rather than guided. Polishing afterwards does not rescue it, and over-polishing creates its own problems.
Practise on the setup you will be graded on, with the bur set you will actually bring, and in the same working position every time. Consistent position produces consistent surfaces.
Common mistakes that cost candidates points
The four-week practice protocol
If you have about a month, this is the shape to follow. With longer, stretch weeks one and two. With less, keep weeks three and four and narrow to the exercises your school has set.
The step people skip is week three, and it is the one that decides whether weeks one, two and four were worth anything.
The difference between prepared and unprepared candidates
Candidates who prepare specifically for bench tests, on typodonts, under a timer, with feedback, perform visibly differently from those who arrive relying on clinical instinct. Committees see it immediately. Your clinical experience is the foundation, but targeted preparation is what earns the score.
Mastering Bench Test Preparation with Dr. Kaur
Seven live days on Zoom, one preparation at a time, with a live demonstration before each one and individual feedback on your own work from US-licensed faculty. Then a practice week with unlimited evaluations, a competency exam and your certificates.
The full curriculum, day by day, is in the bench test course blueprint, and the self-study plan is in how to prepare for the dental bench test.
The rest of the bench test guides
Send us what your school has set
Tell us the exercises on your invitation and how long you have. Our Admin Team with Dr. T and Dr. Kaur will contact you over WhatsApp and help you plan around them.
Last reviewed 6 October 2026. Procedure lists are what candidates report across US and Canadian programmes, and schools change their bench tests, so confirm the format with your own programme after your invitation arrives. Timings are typical rather than universal.