Occlusal Schemes Flashcards
Mediotrusive movement and contacts?
Non- working side movement
contacts of the teeth on the side opposite to the side toward which the mandible moves in articulation
Contacts on working side?
yes
contacts of teeth made on the side of the occlusion toward which the mandible has been moved
laterotusive movement
Immediate side shift
immediate 1 mm movement of the condyle
Immediate side shift
immediate 1 mm movement of the condyle
TRANSLATORY portion of lateral movement of the mandible in which the nonworking side condyle moves essentially straight and medially as it leaves centric relation
both immediate and progressive side shift are from which condyle?
NON - working side
the translating side
both immediate and progressive side shift are from which condyle?
NON - working side
the translating side
laterotrusive movement
working movement
pronouncing ‘S’ sounds appropriately determines which space?
inter-occlusal rest space - difference between VDR and VDO which is about 2mm?
*contacts during working side movement should do what?
DISARTICULATE the teeth on the non-working side
anterior and lateral excursions should be compatible with?
POSTERIOR CUSPAL ANATOMY TO AVOID POSTERIOR INTERFERENCES
non axial loading
opposing teeth contact on inclines
direction of force is not through the long axis of the tooth
TIPPING FORCES CREATED
this can cause compression and elongation in areas which overall leads to forces that are not effectively dissipated to the bone = complications
axial loading
cusp tip contacts FLAT SURFACES
the forces are directed vertically through the long axis of the teeth
force is well accepted by the periodontal ligament
bilateral tooth contacts + why do we need them
Simultaneous and even bilateral occlusal contacts
1. maximize mandibular movement
2. minimize the overall force to each tooth
STABILIZES bite and minimize forces to each tooth
even the contacts on posterior teeth to share the load of forces
what holds the vertical dimension?
implications?
POSTERIOR teeth - so we need to make sure we have even posterior contacts
name the occlusal schemes
canine guidance
group function
canine guidance
disclusion of all posterior teeth on working and non-working side when going into lateral movement
ONLY CANINES CONTACT ON THE WORKING SIDE
Importance of canine guidance
forces?
roots?
muscles?
canines are best suited to ACCEPT HORIZONTAL FORCES that occur during eccentric movements in addition to disarticualting the posterior teeth
longest and largest roots are surrounded by dense compact bone, which tolerates the forces better than does the medullary bone in posterior
FEWER MUSCLES are active when canines contact during eccentric movements than when posterior teeth contact, so lower levels of muscular activity would decrease the forces to the dental and joint structures
group function contacts?
canines AND posterior teeth are touching/occluding on the working side (sharing load)
NO CONTACT on non-working side
canine and two pre-molars only = still considered group function
anterior guidance
when mandible moves forward into protrusive contact, ONLY ANTERIOR TEETH SHOULD CONTACT to therefore disarticulate the posterior teeth
to LIMIT DAMAGING HORIZONTAL FORCES
manipulation of anterior guidance?
horizontal and vertical overlap of the teeth
mutually protected occlusion
posterior teeth –> provide protection during static loading and vertical forces
anterior teeth –> provide protection during dynamic loading and horizontal forces
posterior teeth function in mutually protected occlusion
effectively accept forces applied during closure
their position in the arch is such that the forces can be directed through their long axes and dissipated efficiently
*most effective in stopping mandible during closure
static loading and vertical forces
anterior teeth function in mutually protected occlusion
in position to accept the forces of ECCENTRIC mandibular movements
*most effective in guiding mandible
dynamic loading, horizontal forces
specific protection in lateral movements?
canines
specific protection in protrusive movements?
anterior teeth
proximity of medial wall implication?
no or limited lateral translational movement occurs
distance between medial wall and medial pole?
lateral translation movement occurs
bennet movement = working /rotating condlye
bennet angle = non-working
condylar motion during laterotrusion?
bennett movement and bennett angle
bennett movement
AKA lateral side shift
a lateral shift of the rotating condyle during laterotrusice or working movement of mandible
bennett angle
immediate side shift + progressive side shift
the angle formed by the medial movement of the orbiting condyle during laterotrusive
(or working movement of mandible as viewed from the horizontal plane)
the more medial the medial wall is from the condyle…
the greater the lateral translation movement will be
in right mandibular movement describe R and L condyles
RIGHT = working/ rotating condyl and it is laterotrusive movement and produces the bennett movement
LEFT = orbiting / non-working condyle and is termed mediotrusive movement with a bennet angle occuring
movement of non working condyle
translation
FORWARD, DOWN, MEDIALLY
down(inferior), out (forward / protrusive) and medially
where is protrusive movement seen?
IN SAGITTAL plane
where do you see/ observe the bennett angle?
Horizontal plane
lucia jig
an anterior jig used to deprogram
made out of acrylic and fabricated outside of the mouth and then stable when placed inside the mouth
- provides DISCLUSION OF POSTERIOR TEETH AS CLOSE TO MIP AS POSSIBLE
- used in patients with upper and lower anterior teeth
Frontal plane border and functional movement shape
shield shaped border movements
functional border = tear shaped
where do functional movements start and where to border movements start?
Border = CR
Functional = MIP
what affects the functional border in frontal plane?
CHEWING PATTERN
frontal plane border movements
- left lateral superior border
- left lateral opening border
- right lateral superior border
- right lateral opening border
