Occlusion 1

gap

anterior diastema

gingival cleft

functional mobility of teeth

• right and left temporomandibular joints
• occlusion of permanent dentition
• neuromusculature

• 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

• masseter
• temporalis
• 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

incisors protect the canines and posterior teeth

protects the posterior teeth through posterior disclusion

premolar region

molar region

• 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

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 shorter the cusps MUST be

• 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

• between the inner incline of a non-supporting cusp
• the outer incline of a supporting cusp

• 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

curvature which begins at the canines and follows the buccal cusp tips of the premolars and molars

less likely to have excursive interferences

• the mediolateral curvature of the occlusal plane of the posterior teeth
• depresses non-supporting cusps and helps prevent working interferences

• 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

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

• steeper
• this helps prevent balancing interference

• maximum intercuspation of teeth
• aka maximum intercuspation
• aka intercuspal position
• aka habitual centric
• aka acquired centric

rolling in of the outer inclines of the supporting cusps places them under/over the line of central groove of the opposing arch

• cusp-marginal ridge
• cusp-fossa
• cusp-occlusal embrasure

opposing buccal embrasures and developmental grooves

mesiobuccal groove of mand 1st molar

distobuccal groove of the mand 1st molar

buccal groove of mand 2nd molar

opposing lingual embrasures and developmental grooves

lingual embrasures in the max arch

lingual developmental groove in max arch

lingual cusps

buccal cusps

contact opposing centric stops and do most of the grinding during mastication

buccal cusps

lingual cusps

.5-1.0 mm

help keep cheeks out of the way during mastication

keep tongue out of the way during mastication

• anterior and premolar region
• less distince in molar region