Work out orthodontic space requirement instantly with clear inputs, formula shown and shareable results.
Subtracts the available arch length from the summed tooth widths to give the space deficit that drives orthodontic treatment planning.
Space analysis
Space deficit = sum of tooth widths - arch length available; a positive value is crowding and a negative value is spacing
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
Interproximal reduction yields roughly 0.3 to 0.5 mm per contact, so a few millimetres per arch.
Commonly above about 8 mm of crowding, though profile, incisor position and growth all contribute to the decision.