TMJ Flashcards
opening and closing
Hinge (rotational)
downward and forward, complex
Gliding (translational)
Mandibular fossa boundaries
Anterior:articular eminence
External: Middle root of zygoma and auditory processes
Posterior : Tympanic plate of petrous portion of temporal bone
Joint capsule inner
Synovial
Joint capsule outer
Fibrous
Joint capsule blood supply
Maxilliary A, Temporal A,Masseteric A
mandibular ligament Origin and insertion and function
O: articular tubercle
I:posterior surface of the condyle
F: restrict backward and inferior movement of mandible to prevent dislocation during forward
Lower joint space function
Hinge: opening and closing
Upper joint space
Transitional: downward and forward
Temporalis OINA
O: temporalis surface of frontal bone
I: coronoid process of mandible
A: rasises and retract mandible
Internal pterygoid OINA
O: pterygoid fossa of pterygoid process
I: pterygoid tuberosity of mandible
A: raises angle of mandible
Masseter OINA
O: pterygoid fossa of pterygoid process
I: pterygoid tuberosity of mandible
A: raises angle of mandible
Lateral pterygoid OINA
O: infra temporal crest of greater wing of sphenoid bone
I: neck of mandible
A:unilateral contraction pulls mandible to opposite side
Lateral pterygoid functions:
SH AND IH
SH: elevation and medial
IH: depression and protrusion
Static
Not moving
Dynamic
Moving
Occlusion of opposing teeth when mandible is in centric location may or may not coincide intercuspal position or maximum intercuspation
Centric occlusion
Maximum occlusal intercuspation irrespective of mandibular condyle position or centric relation
Intercuspal position/maximum intercuspation
Position of mandible in which the condyle are in their uppermost position in the mandibular fossa and related anteriorly to the distal slope of the articular eminence
Centric relation
Habitual postural position of mandible when patient is resting comfortable in the upright position and condyles are in neutral unsreained position in the glenoid fossa
Physiologic rest position of mandible
Lateral movement of mandible wherein condole appears to rotate with a slight lateral shift in the direction of the movement
Bennett movement
Anatomic morphology of the medial wall of the glenoid fossa and the end of the condylar shift or movement on the non working side
Bennett angle
