DA eccentric movements

In right laterotrusive movements, which anterior teeth contact?

6 and 27

Describe the condyle in laterotrusive movement

rotating on the working side

In posterior teeth, the protrusive movement causes the ____ teeth to pass ___ across the occlusal surfaces of _ teeth

mandibular centric cusps (buccal), anteriorly

the protusive contacts occur between the maxillary __ cusps and the ? of opposing ?

can also occur between mandibular __ cusps and ? of the ?

lingual cusps and mesial inclines of opposing fossae and marginal ridge

buccal cusps and distal inclines of opposing fossae and marginal edges

In mediotrusive movement, what cusps contact?

inner inclines of centric

The right condyle is involved in a ___ movement during left lateral movement

translational

Posterior teeth do not contact in laterotrusive movement because of

canine guidance

In protrusive movement when the anterior teeth do not contact (overbite), the ___ __ of mandibular teeth contact the ___ _ of maxillary teeth

mesial inclines , lingual cusps

what are the three anatomical planes of movement

sagittal, frontal, horizontal

What is the MIP (maximum intercuspal position)?

starting point of any eccentric movement

What are the three basic eccentric movements?

laterotrusive (right or left), protrusive (forward), recursive (backwards)

What is this called:

each posterior centric cusp creates a pathway on the opposing occlusal surface when the mandible moves away from MIP

vector pathways

Each lower anterior ____ also creates a pathway on the upper opposing ____ when the mandible moves away from the MIP

incisal edge

lingual surface

What happens to the condyles during retrusive movement?

both condyles are translating together

posterior movement

working side:

nonworking sodes

laterotrusive: side that moves away from midline

medioretrusive: side that moves toward midline

What happens to the condyle during lateral movement?

asymmetrical forward left or right movement

only one condyle is translating while the other is rotating in a stationary position

What is the working side during lateral movement called? what happens? what side is it?

laterotrusive

side of mandible that moves away from midline of body

condyle rotates in stationary position

What is the non-working side during lateral movement called? what happens? what side is it?

mediotrusive

side of mandible that moves towards the midline of the body

condyle moves downward, forward, and medially on articular eminence

Where are posterior protrusive contacts?

mandibular centric cusps (buccal) pass anteriorly across the occlusal surfaces of the maxillary teeth

between the distal inclines of maxillary lingual cusps and mesial inclines of opposing fossa and marginal ridges

between mesial inclines of mandibular buccal cusps and distal inclines of opposing fossa and marginal edges

Are protrusive contacts on the posterior teeth desirable?

no

should adjust restoration with handpiece to eliminate contacts

What are posterior working contacts during a left lateral movement? (laterotrusive)

between inner inclines of maxillary buccal cusps and the outer inclines of mandibular buccal cusps

between outer inclines of the maxillary lingual cusps and the inner inclines of mandibular lingual cusps

What is cross tooth?

outer incline of upper lingual cusp to inner incline of lower lingual cusp

not desirable

second most destructive posterior tooth contact

What are posterior non-working contacts (mediotrusive)?

occur on inner inclines of max lingual cusps and inner inclines of mand buccal cusps

cross arch contact

not desirable -- most destructive posterior contact

What is the most destructive posterior contact?

non-working cross arch contacts

mediotrusive contacts

What is the second most destructive posterior contact?

working cross tooth contacts

laterotrusive contacts

What are anterior protrusive and contacts?

normal occlusal relationship

between the incisal and labial edges of the mand incisors against the lingual fossa areas and incisal edges of max incisors

guiding inclines of incisor teeth

incisal guidance

What is the normal protrusive contact?

anterior only

What are anterior laterotrusive movements?

two types

max and mand canines come into contact during lateral movements and therefore have laterotrusive contacts (between labial surfaces and incisal edges of the mand canines and the lingual fossa and incisal edges of the max canines

Canine guidance: only the canines come into contact during working movement

group guidance: canines and max and mand premolars and or molars contact

What is incisal guidance?

contact between max and mand incisal teeth during protrusion

What is canine guidance? Group guidance?

contact between max and mand canine teeth during laterotrusive movements

labial surface and incisal edges of man canine and lingual fossae and incisal edges of max canine

canines and max/man premolars/molars (specific to UPPER GUIDING AND LOWER CENTRIC)

What is anterior guidance?

incisal and canine guidance together

what can also happen during protrusive movements with the canines?

max and mand canines can contact but is at beginning and is short in duration

what can also happen during laterotrusion movements with the incisor teeth?

incisor teeth in contact

short contact duration at end of movement