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Occlusion > Quiz 1 > Flashcards

Quiz 1 Flashcards

1
Q

What is the function of temporomandibular joint?

A

movement of the joint is characterized by position of condyle in glenoid fossa

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2
Q

what are the function & purpose of the ligaments supporting the temporomandibular joint and mandible ?

A
  1. Limit mandibular movemnet
  2. protect the musculature,especially during extreme movement
  3. they are non-elastic, non-contractile and do not have innervation
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3
Q

Where does articular disc attached anteriorly and posteriorly?

A

anteriorly to the musculature

temporomandibular to retrodiscal tissues

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4
Q

what are the two portions in the temporomandibular ligament?

A
  1. OOP( Outer oblique portion)

2. IHP( Inner horizantal portion)

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5
Q

what is the function of OOP portion of Temporomandibular ligament ?

A

It limits normal rotational opening movement(can only go so far when open the mouth in rotational movement )

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6
Q

what is the function of IHP portion of Temporomandibular ligament ?

A

it limits the posterior movement of condyle and disc(can not go so far posteriorly

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7
Q

where is in the condyle surface area is the greatest?

A

posterior aspect of the condyle

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8
Q

where does the most of articulation between condyle, particular disc and temporal bone occur?

A

in the anterior aspect of the condyle

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9
Q

what is the other name for maximum intercuspation?

A

centric occlusion (CO)

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10
Q

why is maximum intercuspation referred to as habitual occlusion or habitual centric?

A

because patient can achieve this position by habit-patient will do it without even thinking about it

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11
Q

what does maximum intercuspation describe?

A

it describes an occlusal relationship or tooth position

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12
Q

how do the teeth are positioned in maximum intercuspation?

A

they are contacting in a position that the patient finds the most comfortable

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13
Q

is maximum intercuspation reproducible?

A

It is achievable but not always reproducible by the patient -( patient can be found and do not think about ut), reproducible( patient close down and if it off by.5 , it will be not be the same because we can not get into the same position each time)

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14
Q

3 characteristics of maximum intercuspation

A

habitual
comfortabilityly of patient
achievable not reproducible

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15
Q

what does centric relation describe?

A

mandibular position

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16
Q

what does centric relation represent?

A

it describes condylar position and does not need any tooth contact to be obtained

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17
Q

where does centric relation establish the position?

A

it establishes position of the condyle in a superior and anterior location with the disc properly interposed between the condyle and the temporal bone

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18
Q

where does articulation occur in centric relation?O

A

on the thin portion of the particular disc

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19
Q

what is the most stable position of the condyle?

A

centric relation

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20
Q

what is the position called where muculture displays minimal tonus?

A

centric relation

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21
Q

what is an ideal occlusion when the manidbular teeth close against the maxillary teeth? 4

A
  • there is an ideal way for the teeth to contact each other(max)
  • there is an ideal location for the condyle and particular disc to be suituate(centric)
  • the musculature should be at minimal tons
  • occlusal contact should be uniform and simultaneous
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22
Q

what does determine the occlusal position in max intercuspation ?

A

teeth

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23
Q

when do patients will have a condition called slide?

A

if the centric relation and maximum intercuspation do not coincide

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24
Q

what is approx the length of slide in most patients caused from centric relation into max intercuspation

A

1-2 mm

25
Q

maximum intercuspation is simultanous contact of all teeth and is ———– of the slide?

A

endpoint

26
Q

how all occlusal forces positioned in the maximum intercuspation?

A

all occlusal forces should be concentrated down the long axis of posterior teeth

27
Q

what is dynamic in nature and will change throughout patient’s life

A

maximum intercuspation position

28
Q

what is a lateral movement of mandible in eccentric movement of mandible?

A

during left lateral mandibular movement, the right side is considered to be on the balancing side or non-working

29
Q

explain the balancing or non-working side on mandible

A

during left lateral mandibular movement, the right side is considered to be on the balancing side or non-working

30
Q

explain the 6 characteristics of the ideal occlusion

A

centreic and maximum intercuspation occur simultaneously

  1. all teeth contact simultaneously
  2. all occlusal forces on post teeth directed down the long axis of the teeth
  3. ost teeh contacts dominate over anterior teeth
  4. all eccentric movement are guided by anterior teeth
  5. no crossover contacts on post teeth should be seen
31
Q

the emphasis of the led is primarily on the ……….as as eventual precursor our understudying of temporomandibular and occlusal dysfunction

action of muscles will be described as …. vs…… activities

A
  1. muscle of mastication

2. normal vs parafunctiona( abnormal)

32
Q

why understanding muscle of mastication is important?

A

because they are precursor to our understanding of the temporomandibular and occlusal dysfunction

33
Q

3 normal actions of masseter

A
  1. elevate the mandible in a superior direction to eventually contact the max teeth( closing)
  2. aids in protrusion( not the primary muscle)
  3. lateral movemenr( very minor player)
34
Q

what are the 3 mucles involved in seating the condyle in fossa

A

temporalis, masseter, medial pterygoid

35
Q
  1. what muscle contribute most in seating the condyle in fossa?
  2. how does this affect the position of the condyle in the fossa
A
  1. temporalis

2. it is often associated with obtaining the centric relation position of the condyle in the fossa

36
Q

what are the 2 normal actions of the superior head of lateral pterygoid

A
  1. maintains a sustainable and consistent position of the particular disc(Position of the articular on the head of the condyle ( movement is short and controlled and not jerkey movemebt and control )
  2. it is progressively active dying closing movement of the mandible
37
Q
  1. what is the 1 abnormal action of lateral pterygoid

2. how does this happen

A
  1. it displays as a spasm as a rest of some type of occlusal dysfunction like a slide
  2. it results in the articular disc being pulled anteriorly out of the glenoid fossa
38
Q

the lateral pterygoid( sup) works in1.—–and inactivity of the2.——–lateral pterygoid

A
  1. concert

2. inferior head

39
Q

can sup lateral pterygoid be palpated by clinician

A

yes even though it s deep in placement and covered by medial pterygoid

40
Q

why is digastric muscles is described as complex

A

because it has aneterior and posterior portion that do not always work in tandem with each other

41
Q

how does the digastric muscle assist the inferior head of lateral pterygoid?

A

it helps the lateral in opening the mandible, primarily during rapid and decisive opening of the oral cavity

42
Q

2 actions of anterior digastric

A
  1. depress the mandible, when hyoid bone is fixed in position but not to the degree of movement caused by the post head of digastric
  2. the anterior head if minimally involved ( less than posterior) in producing mandibular retrusion
43
Q

2 actions of posterior digastric

A
  1. it depresses the mandible, when the hyoid bone is fixed in position by the remaining uprahyoid and infra hyoid accessory muscles of mastication
  2. it assist in producing mandibular retrusiom) although not anywhere near degree seen with the temporal is)
44
Q

what is the function that is done by both heads of digastric

A

will elevate the hyoid bone(when the teeth are together)during swallowing

45
Q

muscle spasm is more common in —— than in ——

A

posterior than in anterior digastric

46
Q

what is the only muscle in the muscle floor of the oral cavity

A

mylohyoid

47
Q

3 actions of mylohyoid muscle

A
  1. it will slightly depress the mandible
  2. it will elevate the hyoid, the floor of he oral cavity, and the tongue
  3. important in speaking and swallowing
48
Q

early mandibular opening movement occurs is a close proximity to the —–postion

A

centric relation

49
Q

4 actions occur during early mandibular opening movement

A

1.inferior head of pterygoid contracts( controlled, slow and consistent manner)
2.condyle move anteriorly( progress down the slope of the auricular eminence at the begging of the posterior border of the eminence)
3, articular disc will move with the condyle(this is as a result of the dupe head of the lateral pterygoid muscle minimally contracting and the condyle interference with the thin midsection of the articulate disc)
4.superior retrodiscal tissues undergo a slight tautness(as an attachment to the post section of the particular disc and a counterbalance to the sup head of the lateral pterygoid muscle)

50
Q

each of muscles that drive the craniomandibular apparatus has a force direction dependent upon 2 factors?

A
  1. location of the muscle in relation to the condyle and the dentition
  2. directional length of each muscle
51
Q

anterior temporalis force vector

A

superior and slightly anterior

52
Q

middle temporal is force vector

A

superior and slightly posterior

53
Q

post temporalis force vector

A

posteror and slightly superior

54
Q

massseter force vector

A

superior and slightly anterior

55
Q

anterior digastric muscle force vector

A

posterior

56
Q

posterior digastric muscle force vector

A

superior and posterior

57
Q

inferior head of the lateral pterygoid muscle force vector

A

anterior

58
Q

3 important characteristics in medial pole of condyle and medial ptreygoid

A
  1. the relationship of the medial pole of condyle and the medial pterygoid muscle on one side establishes the mid-most position of the mandible at centric relation(Medial pole of condyle( on non-working) and medial pterygoid play factor on centric relation)
  2. the normal curve of the occlusion is possible because the interaction of the medial pole of the condyle with the steep medial wall of the fossa prevents the mandibular posterior teeth from moving straight horizontally toward the midline(Curve of occlusion is possible, medial pole of condyle interact with medial wall of fossa ( condyle has to go down) we don’t want flat occlusion but a deep steep, mesial wall will prevent the flat)
  3. as a result in ideal patients mandibular lateral translation( or direct lateral movement of the mandible toward the midline) is impossible from the fully seated positions of the condyle in the fossa(ateral translation blue arrow, shifting will not occur to the lefr and right

Occlusion (2 decks)

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