TMD Flashcards
Bones involved in TMJ
Mandibular fossa of temporal
Condylar process of mandible
What type of joint is TMJ
Atypical modified hinge joint
Bones covered inj fibrocartilage
Fibrocartilaginous disc separates joint into superior and inferior articular cavities
Ligaments involved in TMJ
Lateral ligament
stylomandibular
sphenomandibular
Nerve supply
Auriculotemporal
Masseteric
Deep temporal
Blood supply
Deep auricular artery
Causes of TMD
Myofascial pain
Dis displacement
Degenerative disease
- local: osteoarthritis
- systemic: rheumatoid
ankylosis, hyperplasia, neoplasia, infection
Other name for disc displacement
internal derangement
why does joint click and how are clicks classified
lack of co-ordinated movement between condyle and articular disc
condyle has to overcome mechanical obstruction before full joint movement can be achieved
clicks classified as early middle late
Most common cause of TMJ clicking
Anterior disc displacement with reduction: disc displaced anteriorly by the condyle until reduction occurs
Signs and symptoms of anterior disc displacement
jaw tightness/locking
movement impaired for short period of time until disc reduces
mandible deviation to affected side
TMD pain in morning/ day?
morning- bruxism
day- habits
Treatment
reassurance, soft diet, analgesia- NSAIDs, local heat, eliminate habits, jaw joint and muscle exercises, BRA
Pathogenesis
inflammation of MOM or TMJ secondary to parafunctional habits
trauma- direct/indirect e.g. sustained opening during dental tx
stress- SH important
psychogenic
Examples of bite raising appliances
Anterior repositioning splint
Michigan splint
Hard acrylic BRA
TMJ surgery examples
arthrocentesis, arthroscopy
