Paper 3 · three hours
Dental Manikin — two brand-new exercises, and one moved lining
Start with the headline that will save you a week of panic: every millimetre specification that existed in the old guidance is unchanged. Nothing has been re-cut. What has happened is that two exercises have been added, one lining has moved, the instrument tray has been rebuilt, and the entire exam-day briefing section has been deleted from the document.
The one-line summary
If you have already learnt the old preparation dimensions, keep them. Then add two exercises you have never seen, and check which instruments have left your tray.
What you must learn
New exercise: all-ceramic crown preparation, with two different material specifications
WasTwo crown preparations only: full gold veneer crown and metal ceramic crown. No all-ceramic exercise existed in the guidance.
NowA third: "Prepare the tooth indicated to receive an all-ceramic crown", specified separately for IPS e.max CAD blocks and monolithic zirconia. Index sectioned once in the middle of the tooth, as before.
Table scrolls sideways →
Not in the guidance — how much is too much?
You spotted the gap correctly: for monolithic zirconia the Consortium gives a minimum and no maximum. That is not permission to cut deeper. On the very same page, the Undesirable Features list — which covers both materials — marks down "too great … reduction occlusally/incisally" and "too great … axial reduction". So a ceiling is being marked; it simply is not given a number.
A defensible working band, and what we would teach: treat 1.0–1.5 mm as the ceiling for monolithic zirconia, occlusally and axially. It matches e.max's own stated axial range, it is what the material actually needs, and beyond it you gain nothing while losing resistance and retention form and moving toward the pulp.
If an examiner asks you to justify a figure: say that zirconia's strength lets you preserve tooth tissue, so you prepare to the minimum the material requires and no further — 1 mm is the floor, and tooth tissue is not recoverable. That answer is defensible whatever number they have in mind.
e.max needs no such judgement: its figures are already ranges, so the ceiling is stated — 2.0 mm incisally and on functional cusps, 1.5 mm on non-functional cusps, 1.5 mm axially.
Table scrolls sideways →
What to do: learn these as a separate set — do not carry over the gold-crown numbers. Three things catch people: the taper is tighter (8°–12°), zirconia needs far less reduction than e.max, and zirconia explicitly forbids a feather or knife edge. Path of insertion and surface finish requirements are the same as the other crowns.
What you must learn
New exercise: Class II in composite — with a 2 mm increment rule
WasComposite exercises were Class III, Class IV, Class V and a fractured-cusp build-up. Class II existed only as an amalgam exercise.
NowA Class II composite in an upper posterior tooth. Cavity design is a "proximal box or boxes… with some extension along the fissure as appropriate" and a smooth cavity outline. The completed restoration: "Composite to be placed increments of no more than 2mm deep" (sic), manipulated to restore the lost marginal ridge and occlusal anatomy, with a tight proximal contact and a smooth surface finish.
What to do: box dimensions match the amalgam Class II — gingival floor clearing the contact by ~0.5 mm, bucco-palatal clearance ~0.5 mm, occlusal lock ~2 mm deep. What is new is the technique marking: incremental placement in ≤2 mm layers, and the undesirable list now includes voids present and excess left on the margin or interproximally. Practise placing and curing in visible increments where an examiner can see you doing it.
What you must learn
Class I occluso-palatal: the lining moved from the pulpal floor to the axial wall
WasOccluso-palatal cavity, item 5 — Lining: "Thin layer applied to the pulpal floor (if applied)".
NowSame exercise, item 5 — Lining: "Thin layer applied to the axial wall (if applied)".
What to do: this is the only desirable-feature wording in the whole Manikin paper that changes where you physically put material, and it is one word buried in a table — which is exactly why it is worth knowing. The depth and width figures for this cavity are unchanged: ~2 mm deep, ~1.5 mm wide, parallel walls with rounded internal line angles.
How you are marked
Exceeds Standard has been softened from "all" to "all, or nearly all"
WasExceeds Standard — Clinical work: "fulfils all of the desirable criteria specified for that stage of the test."
NowExceeds Standard — "Fulfils all, or nearly all, of the desirable criteria specified for that stage of the examination."
Why it matters: the top grade is now reachable without perfection, which matters because an Exceeds in a major exercise is what buys you compensation elsewhere. Meets, Below and Well Below keep their old definitions almost word for word — except that Well Below has dropped the line about the candidate being "unaware of the poor performance".
How you are marked
The compensation rule is now published — and the minor exercise cannot rescue a major one
Was"The two major exercises carry twice the weight of the minor exercise. The overall result… is determined by aggregating the marks from each, with this weighting incorporated." How that played out in practice was left to inference.
NowSame weighting, then stated outright: "an Exceeds Standard in a major exercise will compensate for a Below Standard in any exercise, however an Exceeds Standard in a minor exercise will not compensate for a Below Standard in a major exercise." Exercises and Safe Practice are each classified Pass, Borderline or Fail. Where a candidate falls in the defined borderline range, "their work is reviewed independently by all the examiners on the day" and the final outcome is Pass or Fail.
What to do: spend your time proportionally. A brilliant minor exercise is worth far less than a solid major one, and if you must let something slip, it cannot be a major. Unchanged and still absolute: you must pass the Exercises and Safe Practice sections separately.
What you must learn
The instrument tray has been rebuilt — the gingival margin trimmer is gone
WasMirror No 5 · straight probe No 6 · Thymoxin probe · Williams probe · American patterned probe No 3 · college tweezers · excavator 129/30 · flat plastic 156 · enamel hatchet No 53 + 54 · gingival margin trimmer U1/U2 + U3/U4 · amalgam plugger G · Mortensons plugger · Hollenbach carver · ball burnisher · pencil · scalpel No 11 · spatula · ruler · suture scissors. Slow-handpiece steel burs included flat fissure 1 and 4.
NowMirror handle + front surface No 5 · probe 6 · excavator 129/130 and 123/124 · chisel Hu-Friedy CP 53/54 · plastic filling instrument Hopson 156 · burnisher 1L · amalgam plugger G · Mortonson 2 · Hollenbach 3 carver · college tweezers · spatula No 3 · straight serrated scissors · Thymozin No 2 · Williams 14W perio probe · retractable disposable scalpels No 11 · 6-inch metal slim ruler · pencil. Slow-handpiece steel burs: rose heads ½, 1, 3, 5, 8 — flat fissures no longer listed. Added: "additional burs will be provided on the day when necessary."
What to do: if your cavity technique depends on a gingival margin trimmer to finish the gingival floor of a Class II box, rebuild it now — the instrument is not on the published tray. Same for the American patterned probe, the ball burnisher and the flat fissure steel burs. You gain a second excavator, a Williams 14W and, usefully, a ruler. The high-speed bur list is unchanged: tungsten carbide 170, 330, 331, 331L, 56, 557 and diamonds L767C, L767VF, 170L, 260.8F, 120C, 285.5VF.
On the exam day
The entire exam-day briefing section has been deleted from the document
WasTwo full pages of practical rules: the practice tooth marked with a black cross · check the teeth for manufacturing marks before the start, because after the start any damage is yours · "If you prepare the wrong tooth or wrong side of the tooth, this will be noted in your Safe Practice, and will impact heavily upon your marks" · raise a hand and ask a nurse, never wave at examiners · clocks called out roughly hourly, digital timer on your monitor · no breaks, water fountain available · examiners saying "fine, OK, good" is not feedback · stop immediately when time is called or lose professionalism marks · put the burs back · white coats optional, aprons provided · shoes covering the whole foot, no excessive heels · tell the nurses if you are pregnant or on special medication · gloves, masks and eye protection must be worn · a pre-operative radiograph is provided for the root canal test.
NowNone of it appears. The new document covers the briefings, the practice session, the request-and-assess loop with the examiners, and the operating position — and then moves straight to marking.
Read this carefully: nothing published says these practices have stopped. A skills lab still runs on hand-raising, still calls time, and still expects covered shoes. Treat the whole of the old list as live working practice — because the two items with real marks attached, preparing the wrong tooth and failing to stop when time is called, both still map onto Safe Practice and Professionalism, which are still separately assessed and still capable of failing you on their own.
What you must learn
Class II amalgam now says the caries may be mesial, distal, or both
Was"Prepare a Class II cavity in the tooth indicated to correspond to the caries shown on the accompanying radiograph." Cavity design: "A proximal box and occlusal lock."
Now"…The caries may be located mesially, distally or on both sides of the tooth." Cavity design: "Proximal box or boxes and occlusal lock."
What to do: the old paper already warned that a Class II "could be an MO or a DO or an MOD", but the instruction line now says it too. Rehearse the MOD — two boxes, two matrix considerations, one occlusal lock — to the same standard as a single-box MO. All box dimensions are unchanged.
Confirmed unchanged
Operating position, finger rests and infection control are word-for-word the same
WasSit upright, back supported, bottom to the back of the stool, thighs parallel to the floor, feet flat, neck slightly flexed. Manikin torso flat and parallel to the floor, occlusal plane of the upper arch vertical to force indirect vision. Operate between ten-thirty and one-thirty. Pencil grip near the handpiece head. Finger rest in the same arch, same side as the tooth. Palm grip permitted for chisels but always with a finger rest. Two permitted infection-control breaches: lowering the mask to be heard, and picking up a dropped instrument with explicit agreement.
NowIdentical in substance, restated as a Safe Practice section — "Safe Practice is assessed independently". Same posture, same vertical occlusal plane, same 10:30 to 1:30 range, same finger-rest rules, same two permitted breaches.
Reassurance: the Safe Practice grade descriptors are also unchanged — Exceeds means appropriate position, correct finger rest and full infection control; Meets tolerates occasional lapses; Below and Well Below describe frequent lapses continuing "despite repeated warnings by the examiners".