Document What is IOTN?

Index of Orthodontic Treatment Needed (IOTN) is a scale designed to measure the orthodontic need of a patient. It has two components:

  • The Dental Health Component (DHC)

  • The Aesthetic Component (AC)

The Dental Health Component (DHC) scale (1 to 5):

1 = no need

2 = little need

3 = borderline need

4 = need

5 = very great need

The Aesthetic Component (AC) scale (1 to 10):

1 to 4 = little or no need

5 to 7 = borderline need

8 to 10 = great need

NHS funded orthodontic treatment is normally restricted to individuals with a DHC of 5, 4 or 3 with an AC of 6 or more.

If the DHC value is 3, the AC must also be recorded in box 5 of Part 5 on the FP17O / FP17OW.

In transfer cases it's the original IOTN that determines a patient’s eligibility for NHS funded orthodontic treatment and therefore box 6 (IOTN not applicable) should be crossed in Part 5 on the FP17O / FP17OW.

Guidance for completing the FP17O is available on the NHS Dental Services website.

IOTN, Index, scale, component, aesthetic, 

Need more help?

If this doesn't answer your question please contact us directly or search again. Search Again

Rate this answer