Midterm Questions from Drive Flashcards Preview

Occlusion > Midterm Questions from Drive > Flashcards

Flashcards in Midterm Questions from Drive Deck (53):
1

what is "mesial step"?

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

2

curve of spee

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

3

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

articular eminence of the temporal bone

4

Class 3 dental occlusion?

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

5

leeway space

spaces MESIAL to the developing permanent first molars

6

primate space

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

7

centric relation

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

8

What makes up the stationary component of the mastication system?

MX teeth

9

boundary lubrication refers to?

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

10

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

medial pterygoid muscle

11

curve of wilson

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

12

as articular pressure increases the condyles seats on the?

thin, intermediate zone of the disc

13

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

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

14

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

anteriorly

15

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?

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

16

motor unit consists of

one motor neuron and a varying number of muscle fibers

17

describe the motor unit in the lateral pterygoid muscle

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

18

Myotactic reflex?

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

19

What is responsible for rotational movement in the TMJ?

inferior condyle/disc complex

20

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

false (they do no stretch)

21

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

true

22

what is responsible for the translational movement of TMJ?

superior condyle/disc complex

23

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

nocioceptors

24

example of heterotropic pain? definition?

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

25

major function of the masticatory system include?

mastication of speech

26

what two phases is the the "chewing stroke" in humans?

1) opening phase
2) closing phase

27

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

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

28

range of force of mastication?

35-65kg in humans

29

where is the greatest chewing force in dentition?

1M and 2PM

30

what happens to occlusion if contact between teeth is lost?

opposing teeth tend to supererupt causing proximal drifting adjacent teeth

31

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

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

32

what % of patients have a preferred chewing side?

78%

33

T/F... incisal edges of the incisor teeth closely approximate when "S" sounds are made?

true

34

T/F... proximal forces on teeth can cause 'mesial drifting' over time?

true

35

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

true

36

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

false

37

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

true

38

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

CF of MD 1M

39

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

embrasure space between the MD 1M and 2M

40

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

DUML

41

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

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

42

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

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

43

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

true

44

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

1-2mm posteriorly

45

rotetional MD movement refers to?

translational movement of an object in the same direction

46

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

centric relation position

47

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

10%

48

T/F... sagittal plane border movements of the mandible are defined by a "shield-shaped" pattern?

false
*vertical border movement

49

maximum intercuspation

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

50

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

mandibular teeth
**(maxillary make up stationary)

51

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

true

52

weeping lubrication

synovial fluid in one tissue goes into another

53

inferior vs superior condyle disc movement?

*inferior= rotates about axis
*superior= translational movement