The twin block traction technique

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Abstract
The twin block traction technique combines functional and traction systems to achieve rapid correction of arch relationships in Class II malocclusion. Improved facial balance indicates rapid skeletal adaptation in severe Class II skeletal malocclusions. Twin blocks are upper and lower bite blocks which interlock at an angle of 45° causing a functional mandibular displacement. The concorde face bow combines extra-oral traction with intermaxillary traction by means of a horizontal intermaxillary elastic from the lower appliance to the facebow. If the patient fails to posture in the corrected occlusal position during the night this is compensated for by increased intermaxillary traction force. Reversed twin blocks are used for the treatment of selected Class III malocclusion.

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