Interproximal reduction creates space by removing a controlled amount of enamel from contact surfaces. It is a routine part of many aligner and fixed appliance plans, and it is also one of the easiest procedures to do slightly wrong in a way that only becomes obvious later.
Plan the amount before you touch the tooth
IPR should be quantified in the treatment plan, not judged by eye at the chair. Enamel thickness at the contact area is finite, and the total reduction planned across an arch has to fit within what is clinically acceptable per surface. Bitewings and the digital plan tell you what is available; a gauge tells you what you have actually removed.
Strips or discs?
- Abrasive strips are the safer default in tight contacts and the anterior segment. They give tactile control, they are single-tooth-surface friendly, and they are hard to over-run.
- Discs remove material faster and suit posterior contacts where access allows. Speed is exactly why they need a guard and a deliberate technique — a slipped disc damages soft tissue and adjacent enamel in a fraction of a second.
Many clinicians use both: a disc or coarse strip to open the contact, then finer strips to shape and finish.
Sequence the grits — do not finish on coarse
A workable sequence is: open the contact with a coarse abrasive, refine with medium, then finish with fine. Rough enamel left behind is not a cosmetic detail — a scratched interproximal surface is a plaque-retentive surface, and it is the reason IPR gets blamed for problems it did not have to cause.
Protect what is not being treated
Use a guard or matrix to shield the adjacent tooth and papilla, irrigate to control heat, and separate first where contacts are tight. Working through a wedge or separator gives a cleaner path and better visibility than forcing an instrument into a closed contact.
Measure, then measure again
Verify with a gauge as you go rather than at the end. Reduction is not recoverable — the only way to stay inside the plan is to check before the last pass, not after it.
Finish with remineralisation in mind
Polish the treated surfaces and apply fluoride. Freshly instrumented enamel benefits from it, and it takes seconds.
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