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Occlusion > Midterm Questions from Drive > Flashcards

Midterm Questions from Drive Flashcards

1
Q

what is “mesial step”?

A

the permanent MD first molar is mesial to the permanent MX first molar

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2
Q

curve of spee

A

anterior-posterior ‘curve’ along the buccal cusp tips of the permanent MD posterior teeth

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3
Q

condylar path is determined by what skeletal component of mastication system?

A

articular eminence of the temporal bone

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4
Q

Class 3 dental occlusion?

A

MB cusp of the permanent MX first molar is DISTAL to the MB cusp of the permanent MD first molar

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5
Q

leeway space

A

spaces MESIAL to the developing permanent first molars

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6
Q

primate space

A

spaces mesial to the primary MX canine and DISTAL to the primary MD canine

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7
Q

centric relation

A

is a skeletal position and does not refer to a tooth contact position
*most upward, unrestrained position of mandible in glenoid fossa

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8
Q

What makes up the stationary component of the mastication system?

A

MX teeth

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9
Q

boundary lubrication refers to?

A

the movement of synovial fluid from one capsular area in the TMJ apparatus to another during joint movement

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10
Q

What muscle along with the masseter muscle forms a ‘sling’ at the MD angle?

A

medial pterygoid muscle

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11
Q

curve of wilson

A

transverse occlusal ‘curve’ in a buccal-lingual direction of the permanent posterior cusp tips is termed

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12
Q

as articular pressure increases the condyles seats on the?

A

thin, intermediate zone of the disc

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13
Q

which statement is true concerning the relationship of muscles and the articular surface of the glenoid fossa?

A

as articular pressure increases the condyles seats on the thin, intermediate zone of the disc

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14
Q

when the mandible and condyle/disc assembly are in a rest position, the condyle and disc are positioned?

A

anteriorly

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15
Q

when the mandible and condyle/disc assembly are in a rest position, the condyle and disc are positioned anteriorly what best describes the forces exerted by the superior lateral pterygoid muscle and posterior retrodiscal lamina?

A

the anterior and medial force exerted by the superior lateral pterygoid muscle exceeds the posterior elastic retrodiscal lamina force

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16
Q

motor unit consists of

A

one motor neuron and a varying number of muscle fibers

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17
Q

describe the motor unit in the lateral pterygoid muscle

A

lateral pterygoid muscle has a few muscle fibers per motor neuron and controls PROTRUSIVE change in mendibular position

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18
Q

Myotactic reflex?

A

stretch

*this reflex causes muscle contraction when a sudden force stretches the muscle

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19
Q

What is responsible for rotational movement in the TMJ?

A

inferior condyle/disc complex

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20
Q

T/F… ligaments of the TMJ stretch and produce functional movement

A

false (they do no stretch)

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21
Q

T/F… the articular disc is made of fibrocartilaginous tissue and functions as a true articular surface

A

true

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22
Q

what is responsible for the translational movement of TMJ?

A

superior condyle/disc complex

23
Q

What type of sensory receptors convey afferent neuron information related to pain and discomfort

A

nocioceptors

24
Q

example of heterotropic pain? definition?

A

‘referred pain’

**where the SITE and SOURCE of the pain are different

25
Q

major function of the masticatory system include?

A

mastication of speech

26
Q

what two phases is the the “chewing stroke” in humans?

A

1) opening phase

2) closing phase

27
Q

describe the chewing stroke assuming an Angle’s Class 1 occlusion

A

the mandible drops downward and laterally in the opening phase and the closing phase involves crushing and grinding movements

28
Q

range of force of mastication?

A

35-65kg in humans

29
Q

where is the greatest chewing force in dentition?

A

1M and 2PM

30
Q

what happens to occlusion if contact between teeth is lost?

A

opposing teeth tend to supererupt causing proximal drifting adjacent teeth

31
Q

posterior teeth have inner and outer aspects of the total buccolingual width. describe the outer aspect?

A

the outer aspect is the area between the cusp tip and the external height of contour

32
Q

what % of patients have a preferred chewing side?

A

78%

33
Q

T/F… incisal edges of the incisor teeth closely approximate when “S” sounds are made?

A

true

34
Q

T/F… proximal forces on teeth can cause ‘mesial drifting’ over time?

A

true

35
Q

T/F… the occlusal table is approximately 50% of the total buccolingual width of a posterior tooth?

A

true

36
Q

T/F… in posterior cross-bite situation, the maxillary lingual cusps contact in the central fossa area of the mandibular teeth

A

false

37
Q

T/F… centric cusps or supporting cusps are the mandibular buccal cusps and the maxillary lingual cusps

A

true

38
Q

where does the ML cusp of th MX 1M occlude in class 1 occlusal relationship?

A

CF of MD 1M

39
Q

where does the MB cusp of the MX 1M occlude in class 3?

A

embrasure space between the MD 1M and 2M

40
Q

which acronym applies to posterior tooth contacts in protrusive MD movement?

A

DUML

41
Q

describe a tooth contact in a left working side laterotrusice MD movement?

A

the inner inclines of the MX BCs oppose the outer inclines on the MD BCs

42
Q

what occurs when the mandible has opened a distance of 20-25mm during a posterior border movement?

A

a translational opening continues to a distance of 40-60mm

43
Q

T/F… MD anterior teeth usually contact the MX anterior teeth on the lingual surface 4mm gingival to the incisal edge?

A

true

44
Q

MD tooth BCs may move ___mm _____ in a retrusive mandibular movement?

A

1-2mm posteriorly

45
Q

rotetional MD movement refers to?

A

translational movement of an object in the same direction

46
Q

what is the most superior position of the MD condyles from which hinge axis movement can occur is called?

A

centric relation position

47
Q

the absence of a slide from CR to the MI position occurs in only ___% of the pospulation

A

10%

48
Q

T/F… sagittal plane border movements of the mandible are defined by a “shield-shaped” pattern?

A

false

*vertical border movement

49
Q

maximum intercuspation

A

is a skeletal position which involves a tooth contact position
*HOW teeth come together in full occlusion

50
Q

what is the movable component of the masticatory system? stationary?

A

mandibular teeth

**(maxillary make up stationary)

51
Q

T/F… as articular pressure increases the condyles seats on the thin, intermediate zone of the disc

A

true

52
Q

weeping lubrication

A

synovial fluid in one tissue goes into another

53
Q

inferior vs superior condyle disc movement?

A
  • inferior= rotates about axis

* superior= translational movement

Occlusion (5 decks)

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