dental occlusion quiz 2

Occlusion

the static relationship between the incising or masticating surfaces of the
maxillary or mandibular teeth or tooth

Articulation

the static and dynamic contact relationship during function

TMJs with their surrounding tissues

Posterior Determinants of occlusion

Teeth and their guidance or articulation

Anterior Determinants of Occlusion

even/simultaneous contact, force through long axis (of tooth), horizontal movement towards anterior

characteristics of stable occlusion

rotation

occurs in inferior cavity

sliding movement

occurs in superior cavity

articular disc

functionally acts like third bone of TMJ

External lateral ligament

Prevents from posterior dislocation of the joint

sphenomandibular ligament

primary passive support of mandible, along with muscles of mastication

stylomandibular Ligament

Limits the opening and protrusion movements of the jaw

posterior border

thickest portion of articular disc

intermediate zone

thinnest portion of articular disc

transverse horizontal axis

imaginary line around which the mandible may rotate within the sagittal plane

reproducible, determined by ligaments and TMJ

properties of terminal hinge position

point of initial contact (PIC)

the first occlusal contact between opposing teeth during closure.

centric relation

purely rotary movement about transverse horizontal axis, tooth independent, CONDYLE DEPENDENT

centric occlusion

occlusion of opposing teeth when in centric relation, may or may not coincide with MIP

maximal intercuspal position

complete intercuspation of opposing teeth, INDEPENDENT of condylar position, ie. best fit of teeth regardless of condylar position

long centric/freedom in centric

CO to M IP slde with no vertical dimension change and no interferences

2-4 mm

normal interocclusal rest space (space between teeth at rest)

most anterior superior position of inferior space

position of condyles in central occlusion

centric stop

The occlusal contact point in centric occlusion where opposing teeth meet and provide stability

lingual of upper/buccal of lower teeth

Supporting/functional Cusps

Buccal of upper/LIngual of lower

non-supporting/non-functional cusps

tripods

ideal for cusp-fossae contacts

dipods

ideal for cusp-marginal ridge contacts

Tooth-to-two-tooth MI Contacts

cusp-fossae and cusp-marginal ridge relationships

tooth to tooth MI contacts

all cusp-fossae relationships

occlusal stability and max-mand distance (vertical dimension of occlusion)

importance of contacts

working side

side toward which mandible moves in lateral excursion, affecting occlusal contacts.

non-working side

the side opposite to the working side during lateral excursion

protrusive movement

mandibular forward movement anterior to centric relation

canine guidance

A type of occlusal scheme where the canines separate the opposing teeth during lateral movements, promoting stability and reducing wear.

group function

An occlusal scheme where multiple teeth on the working side contact during lateral movements, distributing forces and providing stability.

class I

classify

class II

classify

class III

classify

Class I articulator

a simple holding instrument capable of accepting a single
static registration; vertical motion is possible (NON-ADJUSTABLE)

class II articulator

instrument that permits horizontal as well as vertical
motion but does not orient the motion to the temporomandibular joints

class III articulator

allow for orientation of the casts relative to the joints and may be
arcon or non-arcon instruments (SEMI-ADJUSTABLE)

class IV articulator

allow for orientation of the casts to the temporomandibular joints and simulation of mandibular movements (FULLY ADJUSTABLE)

facebow

Records the spatial relationship of the maxillary arch to some anatomic reference point or points

earbow

registers the relation of the maxillary dental arch to the
external auditory meatus and a horizontal reference plane

register anterioposterior and vertical relationship of maxilla to transverse horizontal axis

GOAL of facebow/earbow registration