Dent. Anatmy: TMJ Flashcards
TMJ is a
True / False: loading joint
True/ False: synovial joint
Both statements are True
Inferior compartment of TMJ
rotation, superior compartment of TMJ= translation
> 25 mm opening
What part of the condyle is involved in translation?
anterior superior
What ligament restricts protrusive movement?
Stylomandibular ligament
When ligament gets taut in full mouth what happens?
condyles move forward
When yawning, which ligament tightens up so that the condyle stays in fossa & prevents retrusion?
Temporomandibular Ligament
TM Ligament attaches to?
zygoma & prevent excessive retrusion
What ligament is connected the lingual of the mandible?
Sphenomandibular Ligament
Origin & Insertion of sphenomandibular ligament:
Spine of the sphenoid & lingula of the mandible
- prevents excessive opening
Origin & Insertion of pterygomandibular raphe?
Hamulus of the pterygoid plate & mylohyoid line
Origin & insertion of temporomandibular ligament?
Articular eminence/posterior zygomatic arch & neck of condyle
Collateral (Discal) ligaments used during lateral movements & keep articulator cartilage on the ?
condyle head
Disc of TMJ is what to the condyle?
attached laterally
what type of tissue covers the condylar surface of a 10yr old?
Dense fibrous connective tissue
What covers the articulating surface of the TMJ?
Fibrocartilage
Articulating surface of TMJ in older person is covered in ?
Fibrous connective tissue containing chondrocytes
Where is the phagocyte located in the TMJ?
Synovial membrane
What is the direct source of nutrients to the articulating surfaces?
Diffusion from synovial fluid
What type of connective tissue is in the middle portion of the retrodiscal pad?
Loose CT with blood supply
Patient is anesthetized & pain at the TMJ is gone, what nerve is was anesthetized?
Auriculotemporal N (CN V3)
TMJ innervation is from?
Auriculotemporal N
Which criteria determines the progressive shift of nonworking codyle?
Medial wall anatomy of the glenoid fossa
Cusp tip of tooth #6 & 27 touch on laterotrusive movement, where is the condyle on the non-working side?
Medial wall of glenoid fossa
Laterotrusive rotates while mediotrusive side translates ___________
translates forward and opens a bit
When restoring a lingual cusp of man 2nd Molar, which movement is most likely to cause interference?
Mediotrusive
On your articulator, altering horizontal condylar guidance will affect all of the following except?
Laterotrusive
Patient with a class III crossbite does retrusion. What mandibular teeth will the maxillary lateral incisor contact?
Canine & lateral incisor
In class II occlusion during protrusive movement, which teeth does the mandibular canine occlude with?
Max man canine & 1st PM
13 lingual cusp broke, what movement caused it & with what tooth did it break against?
MF cusp of #19 in a right lateral non-working side movement
Pt’s condyle had ankyloses so can only do the hinge motion, no translation. What is the max opening?
30 mm
When swallowing, teeth should be in ?
ICP
Centric relation
most repeatable postion
Rest position
by musculature
Space between teeth in the rest postion is ?
2-4 mm
What is not seen in Posselt’s envelope?
Rest position
Difference between most anterior point and most inferior ?
anterior point = protrusion
most inferior = maximum opening
