IOTN
Also written as: IOTN — Index of Orthodontic Treatment Need
An acronym for Index of Orthodontic Treatment Need, a two-component index assessing the dental health and aesthetic impacts of a malocclusion.
Full Definition
The Index of Orthodontic Treatment Need (IOTN) comprises a Dental Health Component (DHC) and an Aesthetic Component (AC). The DHC grades malocclusions from 1 (no need) to 5 (great need) based on occlusal traits with established health implications. The AC uses a ten-point photographic scale. IOTN is used in the United Kingdom's NHS system to determine eligibility for subsidised orthodontic treatment and features prominently in public health research. Editors working on NHS-related orthodontic documents must ensure grade numbers and component abbreviations (DHC, AC) are used consistently.
Usage
Usage note: Always expand on first use. Specify DHC or AC when reporting component scores. Primarily used in UK clinical and research contexts.
In Context
- "Patients with an IOTN DHC grade of 4 or 5 qualify for NHS orthodontic treatment." — NHS referral guidelines document
- "The study reported IOTN scores at baseline; editors should confirm both DHC and AC components are documented." — Clinical research manuscript review