Movements of the jaw after unexpected contact with a hard object.
D003766:Dental Occlusion; D003769:Dental Occlusion, Traumatic; D005502:Food; D005547:Foreign Bodies; D006801:Humans; D008334:Mandible / Q000502:physiology*; D008409:Mastication; D012021:Reflex, Abnormal; D013997:Time Factors