Failure to adequately retain the appliance, or incorporate as many teeth into the anchor block as possible are common causes of anchorage loss. If fixed appliances are used, as many
Fig. 8a A neck strap. Note the snap away safety mechanism
Fig. 8b An occipital (high pull) headgear again with a snap away safety system
Fig. 8d,e The end of the facebow can be re-curved to improve safety
Fig. 8f,g A plastic coated facebow together with a safety neck-strap
Fig. 8h,i A Samuels locking spring. This secures the face bow to the tube preventing accidental disengagement. This should be used in conjunction with a safety neck strap or snap away headgear
anchor teeth as possible should be banded in order to produce optimum anchorage. Removable appliances should have adequate retention using appropriate well-adjusted cribs or clasps with as much contact with the teeth and oral mucosa as possible.
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