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BDS3 Operative Dentistry > Occlusion 1 > Flashcards

Occlusion 1 Flashcards

1
Q

what is the action of the temporalis

A

elevation and retraction of mandible

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2
Q

what is the action of the lateral pterygoid

A

protrusion and depression of mandible
lateral movements

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3
Q

what is the action of the medial pterygoid

A

elevation
lateral movement
protrusion

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4
Q

what is the action of the masseter

A

elevation and protraction of mandible
lateral movement

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5
Q

what are the 2 major movements of the mandible

A

rotation and translation

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6
Q

what is rotation

A

small amount of mouth opening (only 20mm)
condyle and disc remains within articular fossa
no downwards or forwards movement

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7
Q

what is hinge movements

A

rotation of the condylar heads around an imaginary horizontal line through rotational centres of condyles

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8
Q

what does a facebow record

A

relationship of maxilla to terminal hinge axis of rotation in mandible

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9
Q

what is translation

A

lateral pterygoid contracts
articular disc and condyle move and travel downwards and forwards along incline of articular eminence

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10
Q

what is posselts envelope

A

border movements of the mandible in the sagittal plane

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11
Q

what are the parts of posselts envelope

A

ICP
edge to edge
protrusion
maximum opening (T)
retruded axis position
RCP

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12
Q

what is ICP

A

comfortable bite
maximum interdigitation of teeth

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13
Q

what is edge to edge

A

incisal edges of upper and lowers touch

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14
Q

what is the movement from ICP to edge to edge

A

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

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15
Q

what is protrusion

A

condyle moves forwards and downwards on articular eminence
no posterior tooth contacts

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16
Q

what is maximum opening

A

no tooth contacts and mouth wide open

17
Q

what is the position of the condyle during maximum opening

A

full translation of condyle over articular eminence

18
Q

what is retruded axis position

A

no tooth contacts

19
Q

what is the position of the condyle during retruded axis position

A

superior anterior position of condyle head in fossa

20
Q

what is RCP

A

first tooth contact when mandible is in retruded axis position

21
Q

what is the distance between ICP and RCP

A

1mm

22
Q

what is the movement of the mandible between RCP and ICP

A

slides forward into ICP

23
Q

how do you establish the working side of the mandible

A

it is the side which the mandible slides to when eating

24
Q

what causes lateral movement of the mandible

A

contraction of one lateral pterygoid

25
Q

what is the bennet angle

A

angle formed by the sagittal plane and path of mandibular condyle during lateral movement when viewed in a horizontal plane

BDS3 Operative Dentistry (8 decks)

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