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BDS3 CLINICAL Occlusion > Occlusion 1 > Flashcards

Occlusion 1 Flashcards

1
Q

What is the TMJ

A

a joint between the condylar head of the mandible and the mandibular fossa of the temporal bone

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2
Q

What type of joint is the TMJ

A

synovial

condylar hinge type joint

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3
Q

What type of surfaces does the TMJ have

A

fibrocartilaginous surfaces and an articular disc that divides the joint into 2 halves

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4
Q

What muscle is attached to the articular disc

A

lateral pterygoid

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5
Q

What is the mandibular fossa

A

an indentation in the cranial base

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6
Q

What is the capsule

A

a fibrous membrane that surrounds the joint and attaches to the articular eminence, articular disc and the neck of the mandibular condyle

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7
Q

What is the articular disc

A

it is a fibrous extension of the capsule that runs between 2 articular surfaces of the TMJ

the disc articulates with the mandibular fossa and the condyle of the mandible below

disc divided the joint into 2 sections each with its own synovial membranes and there are synovial spaces and membranes above and below

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8
Q

What is the disc attached to medially, anteriorly, posteriorly and laterally

A

medially - condyle
laterally - lateral ligaments
anteriorly - joint capsule and superior head of the lateral pterygoid
posteriorly - mandibular fossa (referred to as the retrodiscal tissue)

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9
Q

Why is the retrodiscal tissue more responsible for pain

A

it is more vascular

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10
Q

What are the function of the muscles of mastication

A

involved in depression, elevation, and lateral movements of the mandible

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11
Q

What is the function of the supra hyoid muscles

A

elevate the hyoid bone or depress the mandible

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12
Q

What is the function of the temporalis

A

elevates and retracts the mandible and assists in rotation

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13
Q

What is the function of the lateral pterygoid

A

positions disc in closing (superior - SLP)

protrudes and depresses the mandible and causes lateral movement (inferior - ILP)

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14
Q

What is the function of the medial pterygoid

A

elevates the mandible

lateral movement and protrusion

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15
Q

What is the function of the masseter (SMA)

A

elevates and protracts the mandible

assists in lateral movement

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16
Q

What are the mandibular movements

A

rotation

translation (lateral translation is grouped under this too)

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17
Q

What is rotation

A

small amount of mouth opening (up to 20mm)

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18
Q

What happens in rotation

A

the condyle and disc remain within the articular fossa
no downwards or forwards movement
aka hinge movement

19
Q

What is hinge movement

A

it is the rotation of the condylar heads around an imaginary horizontal line through the rotational centre of the condyles

20
Q

What is the name given to the imaginary line in hinge movement

A

terminal hinge axis

21
Q

What does a face bow record

A

the terminal hinge axis

the distance between condyles

22
Q

What does the face bow allow

A

it allows us to ensure that we get as accurate a relationship as possible to that in the mouth when mounting the maxillary casts

23
Q

What happens in translation of the condyle

A

the lateral pterygoid contracts
the articular disc and condyle begin to move
the condyle travels downwards and forwards along the incline of the articular eminence
may also travel laterally (laterotrusive movement)

24
Q

What is Posselt’s envelope

A

it is the extremes of mandibular movmenet

it shows the border movements of the mandible in the SAGITTAL PLANE

25
Q

What is the order of the envelope starting with ICP and going clockwise

A 
ICP
E
Pr
T
R
RCP
26
Q

What is ICP

A

intercuspal position

27
Q

What is E

A

edge to edge

28
Q

What is Pr

A

protrusion

29
Q

What is T

A

maximum opening

30
Q

What is R

A

retruded axis position

31
Q

What is RCP

A

retruded contact position

32
Q

What is ICP

A 
it is the tooth position regardless of the condylar position 
the comfortable bite
best fit of the teeth
maximum interdigitation of the teeth
can be called centric occlusion
33
Q

What is edge to edge

A

it is a tooth position

the teeth slide forward from ICP guiding on palatal surfaces of anterior teeth

incised edges of upper and lower incisors touch

34
Q

What is protrusion

A

the condyles move forwards and downwards on the articular eminence

only incisors and maybe canines touch

there should be no posterior tooth contacts

eventually there should be no tooth contacts

35
Q

What is T

A

no tooth contacts
mouth wide open
full translation of the condyle over the articular eminence

36
Q

What is retruded axis position

A

no tooth contacts
most superior anterior position of the condylar head in the fossa
terminal hinge axis

37
Q

What is the retruded contact position

A

first tooth contact when the mandible is in the retruded axis position

ICP is approximately 1mm anterior to the RCP in 90% of the population

38
Q

Are Rcp and ICP coincident

A

no

mandible slides forward to achieve ICP

39
Q

What is the working side in lateral translation

A

the side that the mandible is going to

40
Q

What is the non working side

A

the side that the mandible is going away from

41
Q

What is lateral translation of the mandible known as

A

Bennet movement

42
Q

What is lateral movement a result of

A

contraction of the lateral pterygoid on one side

43
Q

What is Bennet Angle

A

The path of the nonworking condyle in the horizontal plane during lateral excursion

44
Q

What is bennet movement

A

The bodily lateral movement or lateral shift of the mandible resulting from the movements of the condyles along the lateral inclines of the mandibular fossae in lateral jaw movements

BDS3 CLINICAL Occlusion (3 decks)

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