This X-ray shows typical distal translation of an upper second molar in response to .008 x .030 compression springs. In this patient, the movement was carried out with light activations over a six month period during which no Class II elastics were worn.
This patient underwent 16 months of SPEED appliance treatment in which neither extractions were done nor headgear employed. Class II elastic force ranged from 30 to 60 grams.
The occlusion 9 years after the completion of treatment.
Because frictional resistance can be greatly reduced where desired in the SPEED appliance, it is possible to selectively move teeth by using the principle of threshold stress.
Treatment & Clinical Photography by: Dr. G. Herbert Hanson