TMJ and occlusion Flashcards
What muscles open the mouth?
Lateral pterygoid
Geniohyoid
Mylohyoid
ABG
What muscles close the mouth?
Masseter
Temporalis
Medial pterygoid
What muscles are involved in protrusion?
Masseter
Medial pterygoid
Lateral pterygoid
What muscles are involved in retrusion?
Temporalis
Geniohyoid
ABG
What muscles are involved in lateral excursion?
Lateral pterygoid
Medial pterygoid
What muscles are involved in lateral movement?
Masseter
Temporalis
What innervates the MOM?
Vc
What innervates masseter?
Masseteric nerve
What innervates Temporalis?
Deep temporal nerve
What innervates the pterygoids?
Nerve to m. Pterygoid
Nerve to l. Pterygoid
What innervates Geniohyoid?
C1
What innervates mylohyoid?
Nerve to mylohyoid
What innervates ABG?
Nerve to mylohyoid
What movement is jaw opening?
Hinge
What movement is wide jaw opening?
Hinge and slide
What movement is protrusion?
Slide
Where does the condyle sit?
Glenoid fossa
What does the lateral ligament function to do?
Restricts posterior, lateral and inferior movement
Restricts contra lateral medial movement
Limits extent of pure hinge movement
What are the accessory ligaments?
Stylomandibular
Sphenomandibular
Pterygomandibular
What is the function of accessory ligaments?
Limits range of movement
What are the 2 compartments of the articular disk?
Upper - slide
Lower - hinge
What are the 5 zones of the articular disk ?
Anterior extension
Posterior extension
Disc; anterior band, int zone, posterior band
What part of the disk if continuous with the lateral pterygoid?
Anterior extension
What parts of the TMJ are innervated?
Joint capsule
What is the main source of innervation to the TMJ?
Trigeminal- mandibular division
- auriculotemporal
What is the blood supply to the TMJ?
Branches of external carotid
- maxillary
- superficial temporal
What are the 4 types of articulators?
Simple hinge
Plane line
Average value
Semi adjustable
What is the purpose of a simple hinge articulator?
Holds casts together
What is the purpose of simple hinge articulator?
Holds casts together
What is the purpose of plane line articulator?
Restorations involving guidance
Arbitrary hinge
What is the purpose of an average value articulator?
Fixes prostheses for teeth involved in guidance
Removable prostheses
What is the name of the mandibular semi adjustable articulator?
Debar Mark II (arcon)
What other instrument is needed to take a measurement with the denar articulator?
Face bow
What is the semi adjustable denar articulator used for?
Bridges/ crowns involved in guidance
What measurements do u need for using the semi adjustable articulator?
RCP
relevant excursions
what position is reproducible?
Rested position
What are index teeth?
Teeth that are in contact
Canines
Molars
What planes are used for the Fox’s guide plane?
Frankfort
Interpapilliary
What can be used to examine ICP and excursions?
Articulating paper
What is the importance of OVD RVD and FWS?
Face height
Eating
How do you get patient into RCP?
Tongue to roof of mouth
How can you assess vertical dimensions?
Willis gauge
Mirror handle
How do you calculate FWS?
RVD-OVD
What materials are available for recording occlusion?
Carding wax
Silicone bite registration paste
what is ICP?
intercuspal position
what is RCP?
retruded contact position?
what is OVD?
occlusal vertical dimension
what is RVD?
rest vertical dimension
what occurs on the working side during a lateral excursion?
teeth in contact
bennet movement (rotation around vertical axis, lateral movement)
what happens on the non-working side during a lateral excursion?
teeth do not contact
bennet angle (downwards, forwards over eminence, medial movement)
