Occlusion 4 Flashcards
Posselt’s envelope of motion refers to the ______ range of motion of the _____
Extreme , mandible
In the first 20 mm of opening and closing, the mandible _____ and does not _______
As the mandible continues to open, ____ of the ____ begins
Only rotates, translate (move down and forward )
Translation , Condyle
When viewed from the frontal plane, the ____ movement of the mandible is called the ______
Translatory (medio-lateral), Mandibular Translation
When the mandible moves to the left, the _____ on the left ______ and rotates while the ______ and ____ move forward, downward, and medially within the _______
Condyle, remains stationary
Right Condyle and disk ; articular fossa
What position would the jaw be in if both mandibular Condyles and disc are forward in their glenoid fossa?
Protruded
What is retrusive jaw movement?
Mand movement towards the posterior
If a person has ideal occlusion, moving the ____ of mand anterior teeth against the ____ of max teeth (____) to reach the edge to edge relationship will cause protrusion
Incisal edges, palatal, (incisal guidance)
What is anterior guidance?
When the mand moves into protrusive, the mand anterior teeth glide along the lingual surfaces of the max anterior teeth and disclude the posterior teeth
The most protruded mand position may range from ___ to ___ mm, which is typically ______________
6-12
Well beyond the functional range of mastication
The most retruded tooth contact position of the mandible is typically ______ to the position of the acquired MIP
This _______ is usually about __ mm away from the MIP
Posterior-inferior
Centric occlusion position
1 mm
The working side is the ?
The working side Condyle is the Condyle on the ____ side
Side toward which the mandible moves in lateral excursion
Laterotrusive
The non working side is the ?
What is another name for this side?
The side of the mandible that moves toward the medial line in a lateral excursion
Balancing side
The exact pathway of he Condyle on the balancing side during mediotrusion is determined by the __________, _______, __________, and the _________
Shape of the medial wall & superior aspect of articular fossa
Medial pole of balancing Condyle
Congruency of articulating disc with the articulating surfaces
Tightness of the capsule
Ligaments
Right working movement is the result of ______ around a ____ axis and the _____ of the left Condyle ____, ____, and _____
Rotation of the right Condyle, vertical
Translation
Down, forward, inward
The Bennet angle is the
Angle between the midsagital plane and the curve of the non working Condyle
The bennet movement or immediate side shift is
A minuscule lateral shift of the whole mandible
The amount of translatory displacement (_____) of both condyles varies individually and depends on the _____
Side shift
Anatomical constraints specifics mentioned in other card
What is group function?
Multiple contact relations between max and mand teeth in lateral movements on working side that distribute occlusal forces
____________ is a form of mutually protected articulation in which the ________ and ____ overlap of the _____ disclude the posterior teeth in the excurisve movements of the mandible
Canine guidance
Vertical and horizontal , canine teeth
What is mutually protected occlusion ?
What position is this preventing excessive contact in?
Posterior teeth prevent excessive contact of anterior teeth in MIP
MIP
Anterior teeth disengage the posterior teeth in all mandibular excurisve movement
When does bilateral balanced occlusion occur?
When all posterior teeth contact on the working side and one or more teeth on the balancing side contact simulataneously
When is bilateral balanced occlusion used?
Only in complete dentures (prevents tipping and becoming loose)
* very harmful for natural teeth because there should not be contact on non working side
Shallow articular eminences require ____ cusps
What is this related to ?
Short
Condylar inclination
Steep articular eminence allows for ___ cusps
What is this related to ?
Steep
Condylar inclination
