Sagittal Determinants of Occlusion

When a patient moves their jaw forward, they are in what?

Sagittal plane

It can measure up and down, anterior posterior but not right to left

Down perpendicular but not superior and inferior

Protrusive movement is what

Protrusive movement

Whenever you put a crown in, always

check protrusive movement

Which is bigger inferior or superior head of lateral pterygoid muscle?

Inferior Head of Lateral Pterygoid Muscle

The inferior head does what

Pulls the condyle foward

The superior head does what

Pulls the disc foward

Posselt’s diagram shows us what

Posterior hinge movement and translationan

anterior movement in just translation

maximum opening is how much

50-60mm

How much is hinge opening

20-25mm

How much is average protrusion

9mm

When your teeth are together it is called

Centric occlusion W

Whats another word for centric occlusion

Maximum incuspation

When you put your teeth together the posterior teeth do what

protect the anterior teeth

When you move right to left what happens

anterior teeth protect posterior teeth

In MI we want it on posterior teeth because

there is more surface area, more root surface and they are more vertical

WHen you put your teeth together most of it should be where

on the posterior teeth

There tend to be lighter occlusiion in MI where

on anterior teeth

What is the nutcracker theory

You put it as close to the hinge

Majority of the force is where

on 2nd molars and force deminishes closer to anterior

You have less force where

on anterior teeth compared to posterior

Lines are what

excursive movements

points are what

What is anterior guidance

The influence of contacting surfaces of anterior teeth on mandibular movement

When we move right to left, what does anterior guidance involve>

Inscisors in protrusive movement and canines in lateral movement

Canine guidance + inscisal guidance = what?

Anterior guidance

What is incisal guidance?

Morphological shape of lingual concavity of maxillary anterior teeth

What is the incisal guidence the combination of?

Horizontal and vertical overlap of incisors

Which is stepper, condylar guidance or incisal guidance?

Incisal guidance

Which slope can you control as a dentist?

Anterior teeth - NOT posterior teeth

Which influence the moment more?

The teeth influence

What is canine guidance?

Shape of the lingual slope of the maxillary canines

What else

Psition of maxillary canines (only works if canines are in good postion

if we have weak canines, what do we have to get?

second occlusal scheme

What is group function occlusion

Multiple contact relations between maxillary and mandibular teeth in lateral movements on the working side whereby simultaneous contact of several teeth acts as a group to distribute occlusal forces

What does group function occlusion indicate

when canines are malposed and not capable of discluding the posterior teeth

When the canines are small and weak, they cannot

bear the load of posterior teeth

What is balanced occlusion?

Bilateral, simultaneous, anterior, and posterior occlusal contact in teeth in centric and eccentric

A determinant that increases disclusion of posterior teeth

ALLOWS variation in the cuspal and anterior lingual concavity morphology

A determinant that decreases disclusion of posterior teeth

RESTRICTS cuspal and lingual concavity morphology

Cusp height

if your teeth seperate when you move your jaw around, the cusp could be taller, but they must be shorter

If your jaw goes forward, youre goingto make greater concavity onthe lignual so there is not as much pressure moving forward

Fossa depth

Widen the fossa sometimes within occlusion if there is a lot of posteiro contact

Is this longer or shorter?

Longer

Is this longer or shorter

Shorter

If you have more forward movment, you need to have what

greater concavity

There are 4 sagittal determinants

What is the angle of eminence?

Condylar guidance

What is the horizontal and vertical overlap of anterior teeth called?

Incisal Guidance

What is the curve of spee?

With a steeper curve a spee, the teeth are likely to hit more. with a flatter curve of spee, the teeth can be longer

What is the relation of angle of eminence to the plane of occlusion

skeletal

What is the angle of eminentia?

Angle between condylar path and frankfort plane

The smaller the angle of eminentia

The less separation of posterior teeth

What is a requirement of the cusps in the angle of eminentia?

The cusps must be shorter

What is a requierment of the lingual concavity of the maxillary incisors

Must be greater to compensate for the forward movement

The greater the angel of eminentia

The more seperation of posterior teeth

what is horizontal condylar guidance?

The slope of the articular eminence

The steeper the horizontal condylar guidence,

The cusps of the posterior teeth may be longer

The shallower the horizontal condylar guidance,

The cusps of the posterior teeth must be shorter

Horizontal overlap is what

Overjet

Vertical overlap is what

Overbite

This is an example of

Overjet

This is an example of

Overbite

THe less the horizontal overlap is,

The more separation of posterior teeth

The greater the horizontal overlap,

The less separation of posterior teeth

The greater the vertical overlap

The more separation of posterior teeth

The less the vertical overlap,

The less separation of posterior teth