How to Measure MIO

Mouth opening is measured as a MIO or ROM distance. MIO (maximal interincisal 

opening) is the distance between the central incisors when the mouth is fully open. 

Average MIO for adults is approx. 50mm. By measuring MIO, a therapist can determine

if a patient is WNL or has trismus. ROM (Range-of-Motion) is the maximum distance

the mandible moves. ROM and MIO may be different, e.g. patients with an open bite.                        
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