Intro to occlusion

Question 1

what is occlusion

Answer 1

how the teeth come together and function

Question 2

if the patients bite does not feel comfortable what can this lead to

Answer 2

pain
fracture of restorations
loosening of teeth

Question 3

what can go wrong with occlusion

Answer 3

overloading of force on the teeth

Question 4

what are the causes of overloading on teeth

Answer 4

can be due to a premature contact( interference) “feels high”
lateral excursions on post teeth
excessive forces due to parafunction(bruxism)

Question 5

what is fremitus

Answer 5

the feeling of the tooth vibrating when you touch it

Question 6

what does a lot of fremitus lead to

Answer 6

inflammation and bruising of the PDL which can lead to bleeding
widening of the PDL

Question 7

what can we see on a amalgam filling if the restoration is a bit high

Answer 7

the restoration will become slightly shiny

Question 8

how do we avoid occlusal problems with restorations

Answer 8

by having the restorations conform to the patients existing occlusion

Question 9

what should we do before even starting a filling

Answer 9

use articulating paper to see where the load lies and get the patient to tap tap tap and move side to side

Question 10

what are posterior teeth designed for

Answer 10

vertical forces

Question 11

what issues can occur with bruxism

Answer 11

increased wear
fracture of restorations
muscle pain
microcracks

Question 12

what is free way space

Answer 12

space between the teeth at rest usually 2mm-4mm

Question 13

what is the freeway space usually

Answer 13

2mm-4mm

Question 14

what do we call the occlusion when we bite together

Answer 14

the ICP- inter cusp position

Question 15

what is the ICP

Answer 15

INTER CUSPAL POSITION- the maximal digitation of the teeth

Question 16

what is the ICP driven by

Answer 16

not by bones driven by the position of the teeth

Question 17

what is closing in retruded driven by

Answer 17

the position of the bones- to get the condyle fully seeded in the glenoid fossa

Question 18

what is the RCP

Answer 18

retruded contact point- the first tooth that touches if we were in a skeletal position

Question 19

what is the distance of opening on rotation

Answer 19

20mm

Question 20

what axis do we rotate around when opening the jaw

Answer 20

the terminal hinge axis

Question 21

what is translation of the jaw hinge

Answer 21

the jaw slides forward as it continues to open

allows us to eat nuts etc

Question 22

what muscle is used in translation

Answer 22

lateral pterygoid muscle- pulls the condylar process forwards

Question 23

what key muscles are used when closing the jaw

Answer 23

temporalis
masseter
medial pytergoid

Question 24

what is protrusion

Answer 24

from the ICP TO sliding the jaw forward

Question 25

what helps protect the posterior teeth

Answer 25

condylar guidance-

Question 26

what is condylar guidance

Answer 26

as we protrude the jaw drops down and the lower teeth gets pushed away from the upper teeth

Question 27

what happens if we have a shallow condylar guidance

Answer 27

causes more damage to the posterior teeth as they juddering against each other

Question 28

what are lateral movements

Answer 28

forward backward movement

Question 29

what is the definition of occlusal scheme

Answer 29

either in canine guidance or group function

Question 30

canine guidance

Answer 30

The canines on the working side are the only teeth to remain in contact when moving to that side

Question 31

what is group function

Answer 31

On lateral movements 2 or more teeth remain in contact on the working side

Question 32

what is an articulator

Answer 32

Mechanical device that recreates the patients jaws upon which study models can be positioned and the relationship between upper and lower teeth studied