The index of orthognathic functional treatment need accurately prioritises those patients already selected for orthognathic surgery within the NHS

The index of orthognathic functional treatment need (IOFTN) is a newly-proposed system to help to prioritise patients for orthognathic treatment. The five categories are similar to those used in orthodontics, but include additional parameters such as sleep apnoea and facial asymmetry. The aim of this audit was to validate the index and find out the potential future implications, should such a system ever be adopted by commissioners.We calculated the IOFTN category of 100 consecutive patients who had orthognathic surgery between 2010-14 using clinical notes, photographs, study models, and radiographs, and determined the number in categories 4 or 5, analogous to the current indications for orthodontic treatment within the NHS.

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