Dynamic Occlusion (complete)

Question 1

What are the three planes in which mandibular movement is possible

Answer 1

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

Question 2

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

Answer 2

desirable and undesirable

Question 3

what are interferences

Answer 3

undesirable contacts

Question 4

What is an eccentric movement

Answer 4

any movement from maximum intercuspation resulting in tooth contact

Question 5

what are the three types of eccentric movements of the mandible

Answer 5

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

Question 6

what is centric relation

Answer 6

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

Question 7

What is centric relation contact

Answer 7

the initial tooth contact after centric relation

Question 8

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

Answer 8

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

Question 9

what is occlusal adjustment

Answer 9

AKA selective grinding

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

Question 10

what is selective grinding

Answer 10

AKA occlusal adjustment

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

Question 11

Does the Maxilla move

Answer 11

nope, only the mandible

Question 12

What is protrusion

Answer 12

the mandible moving forward from MIP

Question 13

What is MIP

Answer 13

maximum intercusptation

Question 14

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

Answer 14

contact only among the anterior teeth

Question 15

What is anterior guidance

Answer 15

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

Question 16

What are the guiding inclines of the anterior teeth

Answer 16

the parts of the teeth that touch in anterior guidance

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

Question 17

What are the undesirable contacts in a protrusive movement

Answer 17

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

Question 18

What are protrusive interferences

Answer 18

undesirable contacts that occur in protrusive movements

Question 19

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

Answer 19

both condyles move simultaneously forward and downward along the articular eminence

Question 20

What are the desirable contacts in protrusion

Answer 20

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

Question 21

What is a retrusive mandibular movement

Answer 21

the mandible moving posteriorly from ICP (intercuspal position)

Question 22

how far can a patient usually do retrusive madibular movement

Answer 22

only 1-2 mm

Question 23

What are the undesirable contacts in protrusive movements

Answer 23

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

Question 24

What are the desirable contacts in retrusive movements

Answer 24

there are none. No desirable contacts in retrusive movements

Question 25

What are the undesirable contacts in retrusive movements

Answer 25

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

Question 26

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

Answer 26

they both move simultaneously back and upward into the mandibular fossa

Question 27

Does the maxilla move

Answer 27

nope, only the mandible

Question 28

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

Answer 28

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

Question 29

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

Answer 29

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

Question 30

What are the laterotrusive contacts

Answer 30

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

Question 31

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

Answer 31

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

Question 32

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

Answer 32

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

Question 33

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

Answer 33

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

Question 34

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

Answer 34

it would cause a lot of wear on the teeth

Question 35

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

Answer 35

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

Question 36

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

Answer 36

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

Question 37

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

Answer 37

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

Question 38

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

Answer 38

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

Question 39

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

Answer 39

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

Question 40

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

Answer 40

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

Question 41

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

Answer 41

mediotrusive interferences

Question 42

what is the contact that happens in mediotrusive interference

Answer 42

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

Question 43

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

Answer 43

laterally

Question 44

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

Answer 44

mesially

Question 45

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

Answer 45

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

Question 46

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

Answer 46

through the DB groove of the Md 1st molar

Question 47

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

Answer 47

the distal cusp ridge of the Mx canine

Question 48

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

Answer 48

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

Question 49

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

Answer 49

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

Question 50

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

Answer 50

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

Question 51

all ligual cusps of premolars are out of contact until when

Answer 51

until centric relation is attained

Question 52

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

Answer 52

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