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caused by centric relations interference
caused by working interference
functional mobility of teeth
determinants of occlusion
- right and left temporomandibular joints
- occlusion of permanent dentition
- posterior teeth
- stop movemtn when closing
guide teeth during mastication
- signaled to the brain
- brain instructs the muscles of mastication to bring teeth into "new" maximum intercuspation
muscles of mastication
- lateral pterygoid
- medial pterygoid
- the muscles of the head and neck
- problem with one muscle may not only affect other muscles, but it may affect occlusion
Protrusive movement protection
incisors protect the canines and posterior teeth
anterior guidance protection
protects the posterior teeth through posterior disclusion
effects of anterior guidance greatest in
effects of condylar guidance greatest in
anterior guidance ___ than condylar guidance
- equal to or greater than
- helps condyles working against the posterior slopes of articular eminences during excursive movements
condyles slide forward and downward on the articular eminences
steering wheel of the occlusion
the anterior teeth
during lateral excursion, the canines are the only teeth to touch on the working side
thick facial plates of bone that provide additional protection from the forces on the canines
- during a lateral excursion, the buccal cusps contact along with the canines on the working side
- sometimes best to have no working contacts in large restorative cases
the functional relation of the hard and soft tissues of the temporomandibular joints which controls mandibular movements
the flatter the articular eminence...
the shorter the cusps MUST be
the steeper the articular eminence...
- the taller the cusps MAY be
- want steeper articular eminence
- occur between inner incline of max lingual cusp and the inner incline of the mand buccal cusp
- on supporting cusps
working interfereces occur...
- between the inner incline of a non-supporting cusp
- the outer incline of a supporting cusp
cross tooth balancing interference
- occurss on working side
- is a working interfernce
- NONE ON NON-WORKING SIDE!!
- involves outer incline of a max lingual cusp and the inner incline of a mand lingual cusp
- the non-working side
- moves downward, foward, and medially
- on the working side
- moves laterally
- may be 1)forward or backward 2)upward and downward
curve of spee
curvature which begins at the canines and follows the buccal cusp tips of the premolars and molars
flatter curve of spee...
less likely to have excursive interferences
curve of wilson
- the mediolateral curvature of the occlusal plane of the posterior teeth
- depresses non-supporting cusps and helps prevent working interferences
compensating occlusal curvature
- combination of curve of spee and the curve of wilson
- aka sphere of monson
immediate sideshift and progressive side shift
- initial lateral sideshift of the madible during a lateral excursion
- no longer considered important clinically
- working side
- corresponds to the downward, forward, and medial movement of the orbiting condyle
- non working side
- corresponds to the angulation of the medial wall
- superior wall will have been set to a lateral checkbite or pantographic tracin
- usually 15 degrees
- found on non-working side
bennett movement earliest stage
the condyle on the working side has a lateral side shift or translation during lateral movement
used to set the angulation of the superior walls of the fossae for lateral excursion
used to set the angulation of teh superior walls of the fossae for protrusive movements
orbiting pathway is _____ than the protrusive pathway
- this helps prevent balancing interference
- maximum intercuspation of teeth
- aka maximum intercuspation
- aka intercuspal position
- aka habitual centric
- aka acquired centric
line of central groove
rolling in of the outer inclines of the supporting cusps places them under/over the line of central groove of the opposing arch
three centric stops
- cusp-marginal ridge
- cusp-occlusal embrasure
max buccal cusps in line with...
opposing buccal embrasures and developmental grooves
mesiobuccal cusp of max 1st molar opposes...
mesiobuccal groove of mand 1st molar
distobuccal cusp of max 1st molar opposes...
distobuccal groove of the mand 1st molar
mesiobuccal cusp of max 2nd molar opposes...
buccal groove of mand 2nd molar
mandibular lingual cusps in line with....
opposing lingual embrasures and developmental grooves
mesiolingual cusp of mandibular molars oppose...
lingual embrasures in the max arch
distolingual cusp of mand molar oppose....
lingual developmental groove in max arch
max supporting cusps
mand supporting cusps
contact opposing centric stops and do most of the grinding during mastication
max non-supporting cusps
mand non-supporting cusps
space between supporting and non supporting cusps
max buccal cusps purpose
help keep cheeks out of the way during mastication
max lingual cusps purpose
keep tongue out of the way during mastication
interdigitation most distinct in...
- anterior and premolar region
- less distince in molar region
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