ORAL PHYSIOLOGY SAS 21

Centric occlusion/intercuspal position

is the maximum intercuspation of the teeth. It is a tooth determined position.

centric relation

Position of mandible in which condyle are in uppermost position in mandibular fossa and related anteriorly to distal slope of an articular eminence

Centric relation

It is the jaw-to-jaw relation determiend by the condyles in the fossa

Rest position

Is a postural position of mandible determined by neuromascular activity and to lesser degree by viscoelastic properties of muscles

Neuromuscular activity

Postural postion of the mandible determined by what?

-Emotional stress

-Local factors

Rest position is also affected by?

Rotational movement/ hinge movement

What movement occurs when mouth opens and closes aroudn fixed point with condyle

Rotational movement/ hinge movement

The process of turning around an axis movemnet of a body about an axis

Transitional movement/ lateral movemet

What movement occurs when mandible mvoes forard as in protrusion

Transitional movement/lateral movement

It is defined as a movement in which every point of the moving object simultaneously has the same direction and velocity

Bennett movement

Appers during lateral movement when condyle appears to rotate with a slight lateral shift in direction of movement

Laterotrusive movement (right working movement)

IN bennett movement, what is the movement called when mandibler moves to the right

Mediotrusive movement (balancing/nonwokring movement)

In Bennett movement, what movement is it called when left side moves medaillyu and laterally?

50-60 mm

maximum opening movement

10-12 mm

maximum lateral movement

8-11 mm

maximum protrusive movement

1 mm

retrusive range

Group function

THis refers to multiple contacts in lateral or eccentric mandibular movements

Incisal guidance

This refers to contact of the anterior during protrusive movement of the mandible.

Canine guidance/ canine guided occlusion

This occlusion is occurs only between the upper and lower canines and the first premolar on the working side .

-Good crown:root ratio, tolerate high occlusal force

-Canine root has greater surface area, providing greater proprioception

-shape of palatal surface of upper canine is concave, suitable for lateral movements

Reason why canine is most appropriate tooth to guide madnibular excursion

sensitive teeth

molar pain

cracked tooth

things could go wrong in absence of canine eminece

Slide in centric

Movement from premature contact in centric relation to centric occlusion (intercuspal occlusion)

-Premolars

-Molars

What teeth is where chewing is confined in ?

stomatognathic system

Neurobehavioral aspects of occlusion relate to function and parafunction of

chewing

swallowing

sucking

speech

respiration

ex of functions

bruxism

clenching

grinding of teeth

ex of parafunctions

Occlusal stability

Refers to the tendency of the teeth, jaws, joints, and muscles to remain in an optimal functional state. This includes such mechanisms as mesial migration ( migration of teeth in a mesial direction) , eruption of teeth to compensate for occlusal wear, remodelling of bone, protective reflexes and control of occlusal force reparative processes and others.

Ideal occlussion

Defined as one that has no structural, functional or neurobehavioral characteristics that tend to interfere with occlusal stability.

Functional occlusion

It is an arrangement of teeth which will provide the highest efficiency during all the excursive movements of the mandible which are necessary during function.

Reflexes

Automatic motor responses to sensory stimuli

Jaw-unloading reflex

Refers to cessation of jaw closure (sudden removal of muscle loading) immediately following the fracture of a hard object between the teeth. It is when the jaw closing activity is discontinued before pain or damage occurs.

Oral motor behavior

Refers to observable actions involving the orofacial structures which involves translation of thought, sensation, emotions into actions. These are the functions and parafunctions of the stomatognathic system.

Affect

It is a pattern of sensation, wherein sensory experience may not fall into the usual acceptable range of pleasant or unpleasant. It is the subjective response of an individual to a specific stimulus

Emotion

is a motivational phenomenon that plays a significant role in the determination of behavior. Motivation or drive and emotional states may be the basis for oral motor behavior.