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Occlusion > Dynamic Occlusion (complete) > Flashcards

Dynamic Occlusion (complete) Flashcards

1
Q

What are the three planes in which mandibular movement is possible

A
  1. Sagittal (anterior/posterior)
  2. Horizontal (side to side)
  3. Frontal (up and down) (open close)
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2
Q

What are the two types of contacts caused by movements of the mandible

A

desirable and undesirable

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3
Q

what are interferences

A

undesirable contacts

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4
Q

What is an eccentric movement

A

any movement from maximum intercuspation resulting in tooth contact

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5
Q

what are the three types of eccentric movements of the mandible

A
  1. protrusion (anterior movement of mandible)
  2. retrusion (posterior movement of mandible)
  3. lateral excursive (side to side movement)
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6
Q

what is centric relation

A

not a tooth relationship, but a condyle-disk relationshipin which the muscles of mastication are most relaxed

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7
Q

What is centric relation contact

A

the initial tooth contact after centric relation

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8
Q

after a patient is in centric relation contact, what happens when they squeeze their teeth together?

A

the mandible will slide foreward or eccentrically depending on the position of the interference

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9
Q

what is occlusal adjustment

A

AKA selective grinding

the removal of any interference in Centric relation to obtain freedom in centric

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10
Q

what is selective grinding

A

AKA occlusal adjustment

the removal of any interference in Centric Relation to obtain freedom in centric

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11
Q

Does the Maxilla move

A

nope, only the mandible

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12
Q

What is protrusion

A

the mandible moving forward from MIP

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13
Q

What is MIP

A

maximum intercusptation

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14
Q

What is the desirable contact that occurs in protrusion of the mandible

A

contact only among the anterior teeth

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15
Q

What is anterior guidance

A

the way that a protrusive movement of the mandible is guided by the anterior teeth

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16
Q

What are the guiding inclines of the anterior teeth

A

the parts of the teeth that touch in anterior guidance

  1. Mx lingual fossa and incisal edges
  2. Md labial surface and incisal edges
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17
Q

What are the undesirable contacts in a protrusive movement

A
  1. the distal inclines of the maxillary lingual cusps against the mesial inclines of mandibular fossae and marginal ridges
  2. the mesial inclines of the mandibular buccal cusps against the distal inclines of maxillary fossae and marginal ridges
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18
Q

What are protrusive interferences

A

undesirable contacts that occur in protrusive movements

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19
Q

what happens with the working side condyle and the non-working side condyle in protrusion

A

both condyles move simultaneously forward and downward along the articular eminence

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20
Q

What are the desirable contacts in protrusion

A
  1. the facial surface and incisal edge of the mandibular incisors contacting the lingual fossa and incisal edge of the maxillary incisors
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21
Q

What is a retrusive mandibular movement

A

the mandible moving posteriorly from ICP (intercuspal position)

22
Q

how far can a patient usually do retrusive madibular movement

A

only 1-2 mm

23
Q

What are the undesirable contacts in protrusive movements

A
  1. the mesial incline of the mandibular distobuccal cusps contacting the mesial marginal ridge of the opposing maxillary tooth
  2. the distal incline of the Maxillary mesiolingual cusp contacting the distal marginal ridge of the opposing tooth
24
Q

What are the desirable contacts in retrusive movements

A

there are none. No desirable contacts in retrusive movements

25
Q

What are the undesirable contacts in retrusive movements

A
  1. the mesial incline of the maxillary mesiolingual cusps pass through the central groove then against the mesial marginal ridge on the man molar
  2. the distal incline of the mandibular distobuccal cusps pass through the central groove then against the distal marginal ridge on the max molar
26
Q

in retrusion, what are the movements of both the working and non-working side condyles

A

they both move simultaneously back and upward into the mandibular fossa

27
Q

Does the maxilla move

A

nope, only the mandible

28
Q

What kind of contact normally occurs between the incisors during a lateral movement

A

they normally don’t contact, but if they do it is similar to the contacts in anterior guidance

29
Q

what kind of contact normally occurs between the canines during a lateral movement

A

the distal cusp ridge of the mandibular canine contacts the mesial cusp ridges of the maxillary canine (sometimes)

30
Q

What are the laterotrusive contacts

A

the guiding contacts of the canines in a lateral mandibular movement
the labial surface and incisal edges of mandibular canines against the lingual fossae and incisal edges of maxillary canines

31
Q

When you move your mandible to the left, what guides the movement of the mandible

A

contacts between the upper and lower posterior teeth on the left side

32
Q

when you move your mandible to the right, what guides the movement of the mandible

A

contacts between the upper and lower posterior teeth on the right side

33
Q

when you move your mandible to the left, the left upper and posterior teeth guide the mandible. what parts of those teeth do you want to contact each other

A

you only want contact between the buccal cusps of both the maxillary and mandibular posterior teeth on the left side

34
Q

what would be the problem if both the buccal and lingual cusps of the posterior teeth of both arches contacted when you move your jaw to the side

A

it would cause a lot of wear on the teeth

35
Q

when moving your mandible to the left, what do you want to contact on the right side of the mouth

A

nothing! you only want contact between the buccal cusps of the posterior teeth on the side of the mouth toward which your mandible is moving

36
Q

in lateral excursive movements, how do you distinguish between the working and non-working side

A

the working side is the side toward which the mandible is moving, and is the side on which you want the buccal to buccal contact
the non-working side is the side away from which the mandible is moving, and is the side on which you don’t want any contact

37
Q

what are the desirable contacts on the working side in a lateral excursive movement?

A

the inner incline of the maxillary buccal cusps contacting the outer incline of the mandibular buccal cusps

38
Q

What are the desirable passages on the working side in a lateral excursive movement

A

The Mx mesiolingual cusp passes through the lingual groove on the Md molar
The Md distobuccal cusp passes through the buccal groove on the Mx molar

39
Q

is there supposed to be any contact between the lingual cusps on the working side in a lateral excursive movement

A

nope, on the working side the lingual cusps pass through the mandibular lingual and maxillary buccal grooves

40
Q

What are the undesirable contacts on the working side in a lateral excursive movement

A

the outer incline of the lingual cusps of the maxillary molars with the inner incline of the lingual cusps of the mandibular molars

41
Q

what do you call the non-working side contacts that occur in a lateral excursive movement

A

mediotrusive interferences

42
Q

what is the contact that happens in mediotrusive interference

A

the inner inclines of the maxillary lingual cusps contacting the inner inclines of the mandibular buccal cusps

43
Q

in which direction is the mandible moving on the working side in a lateral excursive movement

A

laterally

44
Q

in which direction is the mandible moving on the non-working side in a lateral excursive movement

A

mesially

45
Q

on the non-working side in a lateral excursive movement, where does the DB cusp of the Md 1st molar pass

A

through the supplemental groove mesial to the triangular ridge of the mesiolingual cusp of the maxillary first molar (parallel to the oblique ridge)

46
Q

where does the ML cusp of the Mx 1st molar pass on the non-working side in a lateral excursive movement

A

through the DB groove of the Md 1st molar

47
Q

what does the MB ridge of the Md 1st premolar contact

A

the distal cusp ridge of the Mx canine

48
Q

what does the DB cusp ridge of the Md 1st premolar contact

A

the MB slope of the buccal cusp of the Mx 1st premolar

49
Q

what does the MB cusp ridge of the Md 2nd premolar contact

A

the DB slope of the buccal cusp of the Mx 1st premolar

50
Q

What does the DB cusp ridge of the Md 2nd premolar contact

A

the Mesioocclusal slope of the buccal cusp of the Max 2nd premolar

51
Q

all ligual cusps of premolars are out of contact until when

A

until centric relation is attained

52
Q

once centric relation is attained, the lingual cusps of which premolars will come into contact

A

the lingual cusps of the maxillary premolars (maybe even the distolingual cusp of the mand 2nd premolar when it is the 3 cusp type)

Occlusion (7 decks)

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