IPR Measurements in Clear Aligners

In the context of clear aligner treatment, IPR (Interproximal Reduction) values such as 0.30 or 0.40 are measured in millimetres (mm), not centimetres.

How to Interpret 0.30 or 0.40 in IPR

• 0.30 = 0.30 mm (which is 0.03 cm)
• 0.40 = 0.40 mm (which is 0.04 cm)

These numbers usually refer to the amount of enamel to be reduced between two teeth at a specific contact point, as planned in the aligner software.

Important Practical Points

• IPR should only be done by a qualified dentist/orthodontist with proper instruments.
• The exact amount and where it is done (which teeth, which contacts) is decided by the treating clinician based on your specific tooth positions and treatment plan.
• If you are unsure about what the numbers mean in your own treatment, it is best to ask your treating dentist/orthodontist to show you the digital plan and clarify whether the value is per contact or a total amount across multiple contacts.

For educational and informational purposes only. Not a diagnosis or medical advice. Please consult a licensed healthcare professional.

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