Dynamic Occlusion Flashcards
Asymmetrical movements
Aka eccentric
What plane is posselts diagram in eccentric movement
Frontal plane
What are d and e in frontal plane
The limit of lateral movement
Mandible moves to the
Working side
Working vs non working side
Working- side of mandible that moves away from the midline
Non working- side of mandible that moves toward the midline
Another name for working side
Laterotrusive
Describe right working movement
LEFT lateral pterygoid working
Translates LEFT condyle down, forward, and in forming Bennett angle
RIGHT condyle rotates around axis
Mandible moves to the RIGHT
Bennett angle
Angle formed by the pathway of the non working condyle
MI to c
C to d
Mi to c is the Result of canine guidance aka gliding over each other
C to d is the result of condylar guidance on NON WORKING side
Canine guidance and condylar guidance
When canines on working side disocclude the posterior teeth
As teeth open more, condylar guidance on the non working side
Horizontal vs lateral condylar guidance
Horizontal is symmetrical movement of the mandible
Lateral is asymmetrical movement of the mandible
Christensens phenomenon
Creation of a space between the posterior teeth bilaterally during protrusion of on the non working side during lateral movement
Working interference
Unwanted contact on the WORKING side during canine guidance
Occlusal table is too high in certain areas, causes deviation of mandible
Non working interference
Unwanted contact on the NON WORKING side
Destructive in nature
Eccentric interference
One tooth hits before the others, it will bear much more force
Causes the jaw to deflect before other teeth can occlude
TMJ put into abnormal position, stress causes damage to ligaments/muscles (opposite side of premature contact)
Antagonists become tired and sore
Mutually protected occlusion
When the front teeth protect the back teeth through canine guidance during excursive movement
And back teeth mutually protect the front teeth by directing the force of occlusion to relieve pressure of front teeth, during MIP
Group function
When patients have teeth that are not capable of canine guidance, multiple posterior teeth contact on the working side during lateral movements
Not as desirable as canine guidance
Posselts diagram in horizontal plane
Symmetrical and asymmetrical movement
IP to d - right working
IP to e - left working
IP to a- symmetrical protrusive
Bennett movement vs Bennett angle
Movement- WORKING side movement of the condyle
Angle- pathway of the NON WORKING condyle
