FIXED PROS - Jaw Movements and Articulators Flashcards

1
Q

what does conformative treatment mean?

A

to not change the way the teeth
- meet in ICP
- slide across each other in lateral and protrusive movements

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2
Q

what device is used to make sure crowns are confirmative?

A

an articulator

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3
Q

what is the purpose of an articulator?

A
  • make sure crowns are conformative
  • replicate the jaw movements and examine occlusion
  • investigate proposed changes to the guidance
    e.g. from group function to canine guidance
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4
Q

how would you know the restoration doesn’t meet the ICP?

A

the patient says it’ll feel too high
use articulator paper

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5
Q

what is the main muscle which works to open the jaw?

A

digastric

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6
Q

how much does the hinge axis usually open up to?

A

20mm

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7
Q

what is the term when the jaw opens?

A

translation

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8
Q

what’s the term when the jaw slides forward?

A

protrusion

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9
Q

describe the condylar guidance angle

A

the angle at which the condyle moves away from the horizontal reference plane

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10
Q

what does an articulator need for it to be more accurate?

A

a articulator eminence and the same condylar guidance angle

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11
Q

what is the term for the side of which the jaw moves to and away from? how does the condyle move in these instances?

A

the side it moves to = working side
- condyle moves to a side

the side it moves away from = non-working side
- condyle moves forward, across and down

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12
Q

what is immediate side shift?

A

a simple lateral movement of the mandible towards the working side

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13
Q

what is progressive side shifts

A

when the non-working side condyl is pulled forward and rotated toward the working side

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14
Q

what is canine guidance?

A

icp moves to a side
working side canines stay in contact
no lateral forces on posterior teeth YAY

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15
Q

why are lateral forces bad on posterior teeth?

A

increase the chance of fracturing teeth/restorations

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16
Q

what is group function?

A

when posteriors touch when going to working side

17
Q

what are the 4 types of articulators?

A

hinge
average value
semi adjustable
fully adjustable

18
Q

describe a simple hinge articulator.

A

can recreate ICP
can open and close

19
Q

describe an average value articulator

A

can recreate ICP
can open, close by rotation and translation
can show lateral movements

20
Q

describe a semi-adjustable articulator

A

can replicate:
- hinge axis position
- ICP
- RCP
- lateral movements

  • use a face bow to record position of hinge axis
21
Q

describe a fully adjustable articulator

A

can replicate:
- position of hinge axis
- ICP
- RCP
- lateral movements

can be adjusted to:
- all surfaces of glenoid fossa
- intercondylar width
- ISS
- condylar angle

22
Q

what is the average distance between condyles?

A

110mm

23
Q

what is the average distance from condyle to incisal edge?

A

110mm

24
Q

what is the average condylar guidance angle?

A

30 degrees