Published October 18, 2026

Finishing & Detailing Clear Aligner Cases: the Finish Checklist, Posterior Open Bite & Ordering the Refinement

Aligned is not finished. What finished actually means — a checklist of bite, alignment, contacts, midlines and edges, not a feeling. Why you judge the finish six trays early, the finishing problems aligners leave more often than braces (posterior open bite first), how to let a posterior open bite settle and help it settle, which tool matches which problem — refinement, settling, or enameloplasty — how to order the refinement like a correction, and how to work the last visit.

The last trays are where a good case becomes a great one — or where an almost-finished case gets called done. Aligned is not finished. Finished means the bite meets, the edges line up, the contacts are closed, and it will hold. This lesson is the end of the series: how to judge a finish honestly, the problems aligners leave behind more often than braces do, the tool for each of them, and how to order the refinement.

What finished means — a checklist, not a feeling

Run this at the last visit before you call it, and score it tooth by tooth:

Alignment — no rotation left, contacts closed, black triangles closed where they can be (the ones that cannot were consented at the start).
The bite — overjet and overbite around 2 mm each; canines in Class I, molars in Class I or the relationship the plan kept; cusps seated, not just touching; posterior contacts that hold shim stock (not a bite that only touches at the front); no posterior crossbite, and excursions that run without an interference.
Midlines — coincident with each other, and the upper centred on the face.
Ridges, inclination, edges — marginal ridges level, buccal and lingual crown inclinations right, incisal edges even.
Roots — angulation reasonable.
The patient’s goal — the thing they came in for, visibly delivered.

Finishing starts before the last tray

Around six trays from the end, look at the case against that checklist and ask what the last tray will not deliver. You usually already know: the lateral incisor that never fully extruded, the premolar stalled at eighty percent of its rotation, the posterior contacts that opened.

Score the finish six trays out. Naming what the last tray will not deliver gives you a choice — a chair-side fix now, or a refinement ordered the day the series ends. Wait four weeks in a passive tray and you lose both time and the patient's interest.

Naming them early gives you a choice — a chair-side fix now (a button and elastic, a re-bonded attachment, the missed IPR), or a refinement ordered the day the series ends, not four weeks later. Late diagnosis of the finish is one of the commonest reasons a case runs long — right after wear.

The finishing problems aligners leave more often than braces

Know where to look. Each has a specific fix — and not every fix is another tray.

Posterior open bite plastic intruded the back teeth · front finished first

Under-expressed rotations round teeth stall short

Under-expressed extrusion a short lateral · an uneven incisal line

Residual spaces or contacts that closed loose

Black triangles after aligning crowded incisors

Lost incisor torque tipped back, not moved bodily

Midline drift off the face or off each other

The seven finishing problems aligners produce more often than braces. Posterior open bite is the one you will see most — the plastic between the back teeth intruded them a little while the front finished first.

Posterior open bite — let it settle, help it settle

This is the one you will see most. Half a millimetre or more of plastic on each arch — about a millimetre between the posterior teeth — sits there for months; the patient occludes through it, and the molars and premolars intrude a fraction. When the trays come off, the back teeth do not meet.

section behind the caninesfront piece kept as a retainer · back free

or the whole tray — nights onlythe back is free by day

still open at 4–6 weeks?add vertical box elastics

Three alternative ways to help a true intrusion bite settle — section the tray behind the canines (front piece kept as a retainer), or wear the whole tray nights-only (either way the back is free by day), and add vertical box elastics if it has not closed by four to six weeks. First rule out a propped bite — an over-erupted second molar or a hanging palatal cusp — which settling will not close.

A true intrusion bite usually settles on its own, and you help it: section the last tray behind the canines and keep the front piece in as the retainer it now is — or leave the tray whole and drop to nights only. Either way the back teeth spend the day free. If it has not closed in four to six weeks, add vertical elastics (box or triangle) for a few weeks; if it still will not close, it goes into the refinement as planned posterior extrusion.

Do not put an open posterior bite under a full-coverage clear retainer — it will hold it open. If the case must move on, retain the front with a fixed retainer and let the back settle under it.

The tools — match each to the problem

Refinement (a new scan and a short additional series) — for anything that is a tooth position: rotation, extrusion, residual space, torque, midline. Overcorrect them in the setup, because they under-expressed once already.
Settling (a sectioned tray or vertical elastics) — for the posterior open bite.
Enameloplasty (a few tenths of a millimetre off an uneven edge, or a reshaped contact for a black triangle) — for edges and embrasures. Plastic moves teeth; it cannot change a shape.
IPR + closure in the refinement — for black triangles reshaping alone will not solve.

Records when the last tray seats fully — not while one is being forced. Finish the IPR still owed before you scan, and scan with the attachments on unless the team asks for them off. The patient stays in the last tray full time while it is made.
Write what is left, precisely — which teeth, which movement, how much, and the overcorrection you want. Add the finish you are aiming for: the overjet and overbite you want, and the midline, so the setup ends where you would sign off.
How many — one is normal; say so at the start so it is not bad news. A second is a question: are you refining a plan problem, a compliance problem, or an expectation problem? Answer that before you order it.

The last visit — a working visit, not a handshake

Attachments off, cleanly — a fine finishing or debonding bur, low speed; then dry the tooth and look, because leftover composite goes chalky against wet enamel, stains, and stops the retainer seating. Polish; do not gouge enamel chasing the last speck.
Recontour — the incisal edges you planned, checked from the front at conversation distance, not just in the mirror.
Confirm the posterior bite has settled.
Final photos and a final scan — your retainer record and your evidence.
Nothing in = relapse — the last tray goes back in (it still fits without attachments) until the retainer is delivered, or make the retainer the same day. The first days without plastic are when the front relapses.
Start photos next to the finish — the patient forgets where they began; showing them is how a good result gets recognised as one.

The takeaway

Finished is a checklist — bite, alignment, contacts, midlines, edges — not a feeling. Judge it six trays early. Know the aligner finishing problems, posterior open bite first, then rotations, extrusion, spaces, black triangles, torque. Match the tool: a refinement for positions, settling for the back bite, enameloplasty for shapes. Order the refinement like a correction, expect one, question a second. And work the last visit — attachments off cleanly, recontour, settle, records, and the before-and-after. This is where a good case becomes a great one.

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Frequently Asked Questions

What does "finished" mean in clear aligner treatment?

A checklist, not a feeling. Alignment: no rotation left, contacts closed, black triangles closed where they can be. The bite: overjet and overbite around two millimetres each; Class I canines, molars in Class I or the relationship the plan kept, cusps seated not just touching, posterior contacts that hold shim stock, no posterior crossbite, and clean excursions. Midlines coincident with each other and the upper centred on the face. Marginal ridges level, crown inclinations right, incisal edges even, root angulation reasonable. And the patient's own goal visibly delivered. Run the list at the last visit before you call it done, and score it tooth by tooth.

Why does finishing start before the last tray?

Because the last tray of the series only delivers what the setup asked of it — and around six trays from the end you can already see what it will not deliver: the lateral incisor that never fully extruded, the premolar that stalled at eighty percent of its rotation, the posterior contacts that opened. Naming them six trays early gives you a choice — a chair-side fix now (a button and elastic, a re-bonded attachment, the IPR that was missed) or a refinement ordered the day the series ends, not four weeks later after the patient has been sitting in a passive tray and losing interest. Late diagnosis of the finish is one of the commonest reasons a case runs long, right after poor wear.

What is a posterior open bite after aligners, and how do you manage it?

It is the finishing problem you will see most: months of plastic between the back teeth — roughly a millimetre across both arches — let the molars and premolars intrude a fraction while the front finished, so when the trays come off the back teeth do not meet. First rule out a bite that is propped rather than intruded (an over-erupted uncovered second molar, or a hanging palatal cusp after expansion) — that is a contact to adjust and settling will not close it. A true intrusion bite usually settles: section the last tray behind the canines and keep the front piece in as a retainer so the back is free to erupt while the incisors are held, or wear the whole tray nights only. If it has not closed in four to six weeks, add vertical elastics; if it still will not close, plan posterior extrusion in the refinement. Never hold an open posterior bite under a full-coverage clear retainer — it holds it open.

Which finishing tool matches which problem?

Match the tool to the problem. A refinement — a new scan and a short additional series — for anything that is a tooth position: rotation, extrusion, residual space, torque, midline; overcorrect them in the setup because they under-expressed once already. Settling — a sectioned tray or vertical elastics — for the posterior open bite. Enameloplasty — a few tenths of a millimetre off an uneven incisal edge, or a reshaped contact for a black triangle — for edges and embrasures, because plastic moves teeth but cannot change a shape. And IPR plus closure in the refinement for black triangles that reshaping alone will not solve. Not every fix is another tray.

How do you order a refinement, and how many are normal?

The same discipline as a mid-course correction. Take the records when the last tray seats fully, not while one is being forced; finish any IPR still owed before you scan; scan with the attachments on unless the team asks for them off; and keep the patient in the last tray full time while the refinement is made, so the new series starts from where you scanned. Write what is left precisely — which teeth, which movement, how much, and the overcorrection you want — and add the finish you are aiming for. Most cases need one refinement; that is normal, and worth telling the patient at the start so it is not bad news. A second refinement is a question: are you refining a plan problem, a compliance problem, or an expectation problem? Answer that before you order it.