Occlusion Lecture 5 And 6

Front 1

What kind of occlusion do you want with dentures? (2)

Back 1

Balanced occlusion

Bilateral centric occlusion

Front 2

Whast is the science of mandibular movment and resultant occlusal contact?

Back 2

Gnathology

Front 3

What is the ideal occlusal contact? (2)

Back 3

Unilateral ecentric contat

and

laterotrusive and protrusive contacts only on the anterior teeth

Front 4

The TMJ disk position can be influenced by? (3)

Back 4

1. Interarticular pressure

2. Morphology of disks

3. Tonus of superior lateral pterygoid (can pull the disk out of place)

Front 5

What do incline contacts create?

Back 5

Horizontal forces

Front 6

What creates axial loading?(2)

Back 6

1.contact of cusp tip or relatively flat surfaces that are perpendicular to thelong axis of the tooth – crests of marginal ridges or bottom of fossa

2.tripodization –cusp contacting opposing fossa developing 3 contacts surrounding cusp tip

Front 7

What class of lever is the jaw/TMJ?

Back 7

Class 3 system

Front 8

What 3 things make canines better able to handle lateral forces?

Back 8

1. Long root

2. Dense compact bone structure

3. Proprioceptive protection - ¡lowers level of force generated byMuscles of mastication

Front 9

Optimum Functional Occlusion Criteria (4)

Back 9

1.Evenand simultaneous contact of all possible teeth with TMJ’s at CR (CR= MI) 2.Eachtooth contacts with forces directed along long axis of tooth

- Cusp tip to support area contacts nSupport area: fossa or marginal ridge

3.Moreforce on posterior teeth in MI (anteriorteeth have passive contact)

4.Noposterior teeth contacts in eccentric movements

- Canine Guidance in lateral movements

- Anterior Guidance in protrusive movements

Front 10

Posterior teeth more influenced by ______?

Back 10

TMJ function (condylarguidance)

Front 11

Anterior teeth more influenced by _____?

Back 11

incisor function

Front 12

lengthof a cusp and the distance it extends into the depth of an opposing fossa aredetermined by 3 factors:

Back 12

1.Anterior (incisal) guidance

2. Posterior (condylar) guidance

3. Its proximity to these factors

Front 13

Steeper condylar angle does what to the cusps?

Back 13

allows for steeper posterior cusps

Front 14

As overjet increases what happens to anterior guidance?

Back 14

anterior guidance decreases (post. cusps flatter)

inverselyproportional

Front 15

As overbite increase what happens to anterior guidance

Back 15

anterior guidance increases (post. cuspscan be taller)

directlyproportional

Front 16

What is the average condylar angle?

Back 16

45 degrees

Front 17

Plane of occlusion: As this becomes more parallel to angle ofeminence, posterior cusp height must_______?

Back 17

be shorter

Front 18

With a decreased radius = Greater Curvature of speed = ____ cusps

Back 18

Shorter

Front 19

With a greater radius = Less Curvature of spee = _____ cusps

Back 19

longer

Front 20

By moving the Curve of Spee anteriorly – all posterior teeth will have ________ cusps

Back 20

Shorter

Front 21

By moving the Curve of Spee posteriorly – all posterior teeth may have _______ cusps

Back 21

taller

Front 22

As lateral translation increases (looser ligaments), bodily shift of mandible dictates that posterior cusp height be ____________

Back 22

shorter