<prompt> Index for orthodontic treatment needs isare:SCAN indexICON indexDAI indexAll of the above  <response>: SCAN index is the synonym for Index for Orthodontic Treatment Needs IOTN. IOTN index was developed by BROOK and SHAW to link dentofacial variation to perceive esthetic impairment.Key Concept:The other Orthodontic treatment need indices are:Handicapping Labio-lingual Deviation Index HLD DrakerDental Aesthetic Index DAI Cons et alIndex of Complexity, Outcome and Need ICON Daniels Richmond 