TMJ Flashcards
The anatomy of the TMj consist of?
What type of joint is it?
Bones and Landmarks
Temporal (upper)
Mandible (lower)
Condyle: convex mandibular condyle
Glenoid fossa/mandibular fossa: concavity
Articular eminence: convex articulation
Synovial joint: diarthrosis
Which of these is incorrect:
Complex synovial joint with two convex surfaces articulating during movement
Joint is divided into two compartments: superior and inferior
Articular disc allows for more congruent and stable joint
None
Compartment that is
Composed of the Temporal fossa/eminence and the Superior synovium attached to the disc
Loose allowing for pure translation
SUPERIOR
Compartment that is:
Composed of the mandibular condyle and synovium attached to the distal aspect of the disc
Taut, pure rotation
INFERIOR
Which articular disc, Limits rot of lower joint
Lateral & medial
Which articular disc, Limits forward translation
Posterior, inferior portion
Which articular disc, Assist ant. translation and restrict post translation of disc
Anterior
What are the composition of the articular disc and their main function? (3)
Collagen - is largely responsible for the disk’s maintaining its shape
Elastin - contributes to the disk’s regaaining its form during unloading
Glycosaminoglycan (GAGs) - composition maintains disks resiliency and resists mechanical compressive force.
What is the common direction of TMJ dislocation
Anterior
Which part of the articular disc is avascularized and no innervations?
Middle/central part
Ligament of the TMJ, and what movements do they limit?
temporomandibular (lateral) ligament - lim:downard and posterior movement;
stylomandibular ligament - limits jaw protrusion; limits the movement anterior; stretch
sphenomandibular ligament - limits the movement posterior; jaw protrusion
What is the resting position of the TMJ?
jaw slightly open “ajar”
lips is usually closed
teeth is slightly few mm away
tongue is resting on the roof of the mouth touching the palate
What is centric occlusion?
relation of the law and teeth when there is a maximum contact of the teeth.
median occlusal position: teeth are fully
CAPSULITIS vs SYNOVITIS
CAPSULITIS
capsulitis: same side mag deflect
ipsi deflection
nahihila on the same side
SYNOVITIS
synovitis: contralateral deflection
opposite
synovium inflammation
naiipit
presence of effusion (accumulation of fluid sa area)
What is CAPSULAR FIBROSIS?
capsular fibrosis: thickening sa area
adhesions brought by thickening sa capsule
adhesion may lead to restriction
ipsilateral deflection
overproduction of fiber
