Occlusion Anatomy and Posselts Envelope Flashcards
what is occlusion
contact between teeth
all tx has an occlusal consequence
2 types of mandibular movements
neuromuscular control
- locomotive forces provides by muscles under CNS
hard tissue guidance
- TMJ and occlusal surfaces of teeth
temporalis
elevates and retracts
assists rotation
lateral pterygoid
positions disc in closing [superior]
protrudes and depresses
lateral movement [inferior]
medial pterygoid
elevates
lateral movement
protrusion
masseter
elevates
protracts
assist lateral
jaw closing is done by which muscles
masseter
temporalis
medial pterygoid
jaw opening is done by what muscles
lateral pterygoid
digastric
what is the TMJ
joint between condylar head of mandible and mandibular fossa of temporal bone
synovial, condylar and hinge joint
fibrocartiliganous surfaces
types of TMJ/mandible movements
translation
rotation
lateral translation
rotation movement
small amount of mouth opening
condyle and disc remains in articular fossa
no downwards or forwards movement
hinge movement
what is facebow
terminal hinge axis recording, distance between condyles
record relationship between maxilla and terminal hinge axis rotation of mandible, allows maxillary cast to be placed in an equivalent relationship in articulator
translation movement
lateral pterygoid contracts
articular disc and condyle begin to move
travels downwards and forwards along incline of articulator eminence
may also travel laterally
posselts envelope 1-7
1 - ICP = intercuspal
2 - E = edge-edge
3 - Pr = protrusion
4 - T = max opening
5 - R = retruded axis
6 - RCP = retruded contact
ICP
intercuspal position
tooth position regardless of condylar position
max intercuspation
comfortable bite, best fit
centric occlusion
