1998. Six yrs. out of retention.Mandibular scanning and coronoplasty of upper and lower incisors.Scan 1 : crossover.Good speed of contact(2), LMM at 3.6..Coronoplasty and partial success : incisors are not well positioned; patient is asymptomatic(4-5) . Crossover is present in scan 1 and revels lingualization of upper incisors. Patient was instructed not to tap on scan 5 but to clench hard in order to obtain maximum vertical occlusion.Stability of habitual occlusion is seen on scan 2 (lat. and vert.) and in scan 3 (ant. and post.)