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BDS3 Operative Dentistry > Occlusion > Flashcards

Occlusion Flashcards

1
Q

what elevates and retracts the mandible

A

temporalis

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2
Q

what protrudes and depresses the mandible and causes lateral movement

A

lateral pterygoid

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3
Q

what elevates and protracts the mandible

A

masseter

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4
Q

what elevates the mandible and aids in lateral movement and protrusion

A

medial pterygoid

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5
Q

what are three types of mandibular movements

A

rotation
translation
lateral translation

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6
Q

what is rotational movement

A

small amount of mouth opening (RCP)
condyle and disc remain in the articular fossa
no forward or downwards movement
known as a hinge movement

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7
Q

what is the terminal hinge axis

A

imaginary line via which the condyles rotate

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8
Q

what is translation movement

A

lateral pterygoid contracts and causes articular disc and condyle to move
travels downwards and forwards

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9
Q

what three planes are border movements viewed at

A

horizontal
sagittal
frontal

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10
Q

what is posselts envelop

A

extremes of mandibular movement

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11
Q

what is ICP

A

tooth position regardless of condyle position
most comfortable bite

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12
Q

what is edge-edge position

A

condyle moves forwards in translation and teeth are contacting at incisal edges

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13
Q

what is protrusion

A

past edge-edge
condyle moves forwards and downwards on articular eminence

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14
Q

what is maximum opening

A

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

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15
Q

what is the retruded axis position

A

no tooth contact
most superior anterior position of the condylar head in the fossa

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16
Q

what is RCP

A

first tooth contact in the retruded axis position

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17
Q

what is lateral translation

A

result of contraction of only one lateral pterygoid muscle

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18
Q

what is the working side

A

the side the mandible moves towwards

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19
Q

what is the bennet movement

A

another term for lateral translation - a bodily movement

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20
Q

what is the bennett angle

A

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

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21
Q

what side do you take the bennet angle from

A

the non working side

22
Q

how do you mark tooth contacts

A

articulating paper
millers forceps to hold the paper

23
Q

when do you mark tooth contacts

A

preparing a tooth
removing a restoration
placement of a crown
placement of a restoration

24
Q

what is static occlusion

A

incisor relationship
molar relationship
overjets/ bites

25
Q

what are functional cusps

A

cusps that occlude with opposing teeth in the ICP

26
Q

what problems occur in static occlusion

A

angles classification
overbite / overjet
crossbite
AOBs

27
Q

what are examples of dynamic occlusion

A

canine guidance
group function
protrusion

28
Q

what are occlusal interferences

A

undesirable tooth contacts that produce mandibular deviation during closure to ICP

29
Q

what are examples of occlusal interference

A

working side
non-working side
protrusive

30
Q

what is a working side contact

A

usually a posterior tooth when the mandible is moved laterally that is in contact with the upper arch

31
Q

what is a non working side contact

A

tooth contacts on the non-working side where there shouldnt be any

32
Q

what is protrusive interference

A

any posterior contact during protrusion

33
Q

why do we need to avoid posterior contacts

A

molars arent designed to absorb heavy forces in the direction of long axis of the tooth

34
Q

what is eccentric bruxism

A

parafunctional grinding of teeth side to side

35
Q

what is centric bruxism

A

clenching

36
Q

what are clinical signs of bruxism

A

tooth wear
fractured restoration
tooth migration
muscle pain and fatigue

37
Q

what is occlusal trauma

A

injury resulting in changes in the attachment apparatus including PDL, supporting alveolar bone and cementum as a result of occlusal forces

38
Q

what are the three types of articulator

A

ARCON
average value
semi-adjustable

39
Q

what are the average values for the Bennet Angle and Condylar Guidance angle on an average value articulator

A

bennet angle -15 degrees
condylar guidance angle -30 degrees

40
Q

how can you mount a maxillary cast onto an articulator

A

facebow transfer

41
Q

what is the first step in recording facebow occlusion

A

mark anterior reference point

42
Q

how do you mark an anterior reference point for using a facebow

A

use patients right side
43mm apical to the incisal edge of the 12 ideally
position of this dot should be approximately position of infra-orbital foramen

43
Q

what is the second step in using a facebow

A

apply registration paste to the bite fork and firmly seat on maxillary teeth

44
Q

what do you need to do with the locating notch on the bitefork

A

have it at the midline

45
Q

what should the facebow be parallel to

A

inter-pupillary line

46
Q

what do you need to mount the lower cast against the maxillary cast taken by using facebow

A

ICP
or RCP

47
Q

what can you use when ICP is not obvious to technician

A

wax wafer
silicone past which sets quickly

48
Q

what is a conformative approach

A

the provision of restorations in harmony with the existing jaw positions

49
Q

when is the conformative approach not used

A

an increase in vertical height is needed
teeth are out of position
a slight change in appearance is wanted

50
Q

what are factors of copying existing guidance

A

simple
conformative
most often

BDS3 Operative Dentistry (6 decks)

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