extrusion

extrusion /ek·stro̅o̅′zhən/ [L, extrudere, to push out] , 1. thrusting or pushing out; expulsion by force. 2. the overeruption or movement of a tooth beyond its normal occlusal plane in the absence of opposing occlusal force. 3. an orthodontic technique for the elongation or elevation of a tooth. Compare intrusion.