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Occlusion > Midterm Questions from Drive 2 > Flashcards

Midterm Questions from Drive 2 Flashcards

1
Q

plane of occlusion

A

lines connecting cusp tips and incisal edges

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2
Q

arch length

A

distal 3M to distal 3M of each arch; MX > MD

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3
Q

which arch has greatest width?

A

MX > MD

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4
Q

supporting/centric cusps

A

MD buccal and MX lingual

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5
Q

guiding/non-centric cusps

A

MD lingual and MX buccal

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6
Q

each tooth occludes with 2 opposing teeth EXCEPT?

A

MD CIs and MX 3Ms

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7
Q

Mesial step relationship between MD and MX 1Ms?

A
  • permanent MD 1M is mesial to MX 1Ms

* MB cusp of MX 1M is in the buccal groove of MD 1M

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8
Q

curve on monson

A

spherical curve of approximately 8” resting on buccal cusps of mandibular posterior teeth

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9
Q

MD vs MX posterior crown tilts?

A
  • MD= lingual

* MX= buccal

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10
Q

skeletal components?

A

condyle and articular eminence

*condylar path determined by articular eminence

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11
Q

1) class 1
2) class 2
3) class 3

A

1) MX MB cusp in MD B groove
2) retruded mandible= MX MB cusp is mesial to MD B groove
3) protruded mandible= MX MB cusp distal to MD B groove

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12
Q

Class 2 division 1 vs division 2?

A
  • 1= MX incisors in normal position

* 2= MX incisors retruded and inclined lingualy

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13
Q

working vs non-working side of mouth

A
  • working= side that mandible moves towards

* non-working= side which mandible moves away from

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14
Q

Masseter A, O, and I?

A

A- elevates mandible
O- zygomatic arch
I- coronoid process and anterior border of ramus

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15
Q

temporalis A, O, and I?

A

A- elevates mandible
O- pterygoid fossa
I- coronoid process and anterior border of ramus

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16
Q

medial pterygoid A, O, and I?

A

A- elevates, protrudes, and mediotrusive (unilateral) mandible movement
O- pterygoid fossa
I- medial angle of mandible

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17
Q

lateral pterygoid Superior Head A, O, and I?

A

A-
O- greater wing
I- capsule and disc and neck of condyle

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18
Q

lateral pterygoid Inferior Head A, O, and I?

A

A- protrude (bilateral) and mediotrusive (unilateral)
O- lateral pterygoid plate
I- neck of condyle

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19
Q

Anterior belly of Digastric

A

A- depress/pull mandible back and elevates hyoid when mandible is stable(swallowing)
O- digastric fossa
I- middle tendon at hyoid

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20
Q

Posterior belly of Digastric

A

A- depress/pull mandible back and elevates hyoid when mandible is stable(swallowing)
O- mastoid notch
I- middle tendon at hyoid

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21
Q

motor unit with few or a lot of fibers? muscles examples?

A

motor unit= motor neuron and # of muscle fibers it innervates

  • few= precise movement (lateral pterygoid)
  • more fibers= gross function (masseter)
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22
Q

stretch/myotactic reflex? determines what?

A

causes contraction when a sudden forces stretches them

***determines muscle tonus

23
Q

What is the computer board of brain? does what?

A

CNS= thalamus= controls and directs signals from cortex

24
Q

primary pain

A

site and source of pain are the SAME

heterotropic pain has different site and source

25
Q

TMJ innervated by? BS?

A

innervated by auriculotemporal nerve and BS is superficial temporal, middle meningeal artery, and maxillary artery

26
Q

functional vs accessory ligaments examples

A
  • functional= collateral, capsular, temporomandibular

* accessory= sphenomandibular, stylomendibular

27
Q

articular disc attaches?

A

posteriorly to retrodiscal tissue and anteriorly to capsular ligament

28
Q

what forms sling?

A

medial pterygoid forms sling with masseter laterally

29
Q

denture bite force compared to normal?

A

1/4 of natural teeth

30
Q

tongue thrusting

A

habit where tongue pushes excessively against incisors when swallowing, causes flaring of teeth

31
Q

occlusal table

A
  • occlusal surfaces of teeth
  • between B and L cusp tips of posterior teeth
  • ~50-60% of BL width of tooth
32
Q

buccoocclusal (BO) line vs linguooclusal (LO) line vs central fossa (CF) line?

A
  • BO= line through all buccalcusp tips of MD posterior teeth
  • LO= line through all lingual cusp tips of MX posterior teeth
  • CF= line though central grooves of MX and MD teeth
33
Q

centric cusps contact?

A

the opposing central fossa line in central fossa areas

34
Q

what do lingual and buccal embrasures do? which is better?

A

lingual> buccal

**guide food towards tongue

35
Q

nociceptor, proprioceptors, interoceptors?

A
  • nociceptor- pain
  • proprioceptors- position and movement
  • interoceptors- internal organ
36
Q

muscle spindles do what?

A

monitor length within skeletal muscle

37
Q

golgi tendon organ does what?

A

monitors muscle tension

38
Q

pacinian corpuscle does what?

A

movement and firm pressure?

39
Q

retrodiscal ligament does NOT?

A

stretch

40
Q

isotonic vs isometric?

A
  • isotonic= shortening under load

* isometric= contract without shortening

41
Q

controlled relaxation vs eccentric contraction?

A
  • controlled relaxation= lengthening with decreases motor unit stimulation
  • eccentric contraction= lengthening while contracting simultaneously
42
Q

central pattern generator (CPG)?

It’s two phases?

A

higher centers in brain that control the activity of the specific muscle involved in chewing stroke

1) opening= mandible drops, then moves laterally
2) closing= crush and grind, buccal cusps of MX and MD are aligned then teeth guided to MI

43
Q

central pattern control

A

breathe, walk, chew; brain stem

44
Q

central excitatory effect

A

deep pain input to CNS, stimulates non-associated neurons

45
Q

spinal tract recieves info from?

A

receives periodontal and pulpal afferent (from trigeminal nerve)

46
Q

reticular formation influences?

A

on pain

47
Q

describe the two reflex arches?

A

stimulus response

1) myotactic- causes contraction with stretched
2) nociceptive- protective; biting hard, causing mandible to drop quickly

48
Q

reciprocal innervation controls?

A

antagonistic muscles

49
Q

regulation of muscle activity?

A

gamma efferent system

50
Q

secondary hyperalgesia?

A

increased tissues sensitivity without local cause

51
Q

overjet vs overbite vs open bite?

A
  • over-jet= horizontal
  • over bite= vertical
  • open bite= no contact
52
Q

gliding contact

A

passing of cusp inclines

53
Q

tall cusps and deep fossae = ____ chewing stroke?

A

vertical

54
Q

worn and flat teeth= ____ chewing stroke?

A

broader

Occlusion (5 decks)

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