01:377:303 Lecture Notes - Lecture 12: Orbicularis Oris Muscle, Hyoid Bone, Closed Position

• School: Rutgers University
• Department: Exercise Scienc
• Course: 01:377:303
• Professor: E Manfredonia

Document Summary

Orthostatic position: teeth are slightly apart, normal freeway space, tongue placed on the palate. Freeway space: separation between the central incisors; referred as interocclusal space. Centric occlusion: teeth are in max intercuspation. Position of the tongue is important in that it can determine dentition an shape of maxillary bones. Connects to the hyoid bone which affects muscle balance in the craniomandibular system. Normal resting positon: tongue against the palate with the tip slightly behind the posterior side of the upper central incisors. Functional role: swallowing; normal swallowing, teeth must be together; abnormal swallowing can disrupt the teeth. Anterior force: opposed by teeth and orbicularis oris. Transverse force: opposed by teeth and buccinator. Movement or position of the head can challenge the normal rest positon. Muscle hyperactivity: can lead to a deep overbite. Forward head: the lowered mandible/tongue position facilitates eruption of the posterior teeth.