Clear Aligner IPR: Interproximal Reduction, Safely

Sometimes the teeth need room to move — and it isn’t there. Interproximal reduction, or IPR, makes that room: removing a whisker of enamel between two teeth so the aligners have space to work. Done gradually and measured, it is safe and predictable. Done in a hurry, it takes too much — and you cannot give enamel back. So we do it by the numbers.

What is IPR?

IPR is the gentle reduction of a tiny amount of enamel from the surface between two adjacent teeth, to open a defined space. That space lets a crowded tooth slide into line, or lets you fine-tune a contact.

Reduced carefully, smoothed, and protected, the tooth stays healthy — and the patient never feels it afterward.

Lay out your tools

Three things, before you start:

Polishing strips Abrasive strips that smooth the contact once you are done.

IPR strips Thin, flexible metal strips — colour-coded by thickness — that do the actual reduction.

IPR gauges A fan of metal leaves, each a precise width, that measure how much space you have opened. Your ruler.

Read the report first

Every case ships with a summary report. On the tooth chart, each contact that needs reduction is marked — how much, and at which step: three tenths at one contact, six tenths at another. Read it before you touch a tooth; it tells you exactly which contacts to open, by how much, and when.

And keep your own record as you go — write down each contact you reduce, and by how much. IPR is measured work; treat it like it.

The reduction: go gradually

The one rule that keeps it safe: go gradually. Start by checking the contact with floss, so you know where you’re beginning. Then creep up on the number a tenth at a time — never reach straight for the thickest strip:

The gauge decides, not your fingers: slide it in — if it passes freely, you’ve opened that tenth; if you have to force it, you’re not there yet — keep filing. Step up one tenth at a time so you land on the number exactly and never overshoot.

Finish: reduced, smoothed, sealed

Once the gauge tells you you’ve hit the number, finish the contact:

1. Polish — run a polishing strip through to smooth any ledge or roughness. A rough, freshly-cut surface catches plaque and invites decay, so this step is not optional.
2. Seal — apply fluoride over the reduced enamel. It re-seals the surface and heads off sensitivity.

Reduced, smoothed, sealed — that is a finished contact.

The safety rules

• Respect the amount on the report. More space is never better, and you cannot put enamel back.
• Let the gauge decide, not your fingers. The moment it slides freely, stop.
• Keep the strip moving from the incisal edge toward the gum, and keep the soft tissue out of the way.
• One contact at a time — and never take so much that you break through into the softer layer beneath the enamel.
• Record every contact — so the next visit builds on the last.

Explain it to the patient

In plain words: IPR opens a tiny bit of room between certain teeth so the aligners can move them into place. It does not weaken the tooth, it is not drilling, and once it’s polished they won’t notice a thing. A patient who knows what the strip is for is a patient who sits still — and trusts the plan.

Key takeaways

Read the report, floss the contact, then go gradually — a tenth, two tenths, three tenths — checking every step with the gauge, before you polish and seal. IPR is where patience protects the tooth: take the space you planned, no more, and finish it clean.

Shafaf partners with trained dentists across Iraq and the region. Find a Shafaf provider or talk to us about partnering.