mandibular border movement

Question 1

maximum intercuspation

Answer 1

1) anterior teeth give guidance and separate posterior until the anterior is edge to edge
2) beyond that, maximum protrusion

Question 2

ICP

Answer 2

1) maximal intercuspation position

Question 3

CR

Answer 3

1) centric relation

Question 4

PP

Answer 4

1) postural position
2) or VDR (vertical dimension of rest)
3) doesn’t need teeth for this

Question 5

completely edentulous

Answer 5

1) no ICR
2) CR yes
- skeletal position of the jaw joint
3) PP yes

Question 6

CR doesnt always = MI

Answer 6

1) most patients have some shift from CR to MI
2) freedom in centric (MI no slide)

Question 7

maximum protrusion

Answer 7

1) condyles shifted forwards
2) maximum left laterals

Question 8

anterior guidance

Answer 8

1) anterior guidance helps protect teeth in the jaw
2) want them to guide various excursions so posterior separate
3) depending on vertical and horizontal overlap

Question 9

obstacles to anterior guidance

Answer 9

1) interference, rotations, supereruption
2) inadequate vertical and functional horizontal overlap of the guiding teeth
3) open bite, deep bite
4) canine class II and III

Question 10

biomechanics of anterior guidance

Answer 10

1) the further away from the site of muscle action, the less force is exerted
2) the more anterior the guiding teeth the less force is placed on teeth during closing muscle contraction
- system is more stable, like a bike

Question 11

group function guidance

Answer 11

1) posterior teeth guide
2) kind of want this for edentulous patient

Question 12

posterior interference

Answer 12

1) 2nd and 3rd molars rub, but not the canines and premolars

Question 13

canine guidance

Answer 13

side to side excursionc

Question 14

condyles to anterior teeth

Answer 14

1) 4 inches

Question 15

condyles to molars

Answer 15

1) 2 inches

Question 16

general rules

Answer 16

1) anterior guidance preferred for dentate
2) group function is fine too
- like it to be as anterior as possible

Question 17

occlusal morphology of posterior teeth

Answer 17

1) anterior guidance
2) condylar guidance
3) opposing tooth morphology

Question 18

vertical determinants of occlusion

Answer 18

1) cusp height determined by
2) condylar guidance
3) curve of spee
4) anterior guidance
5) mandibular translation

Question 19

angle of articular eminence vs occlusal plane

Answer 19

1) steep angle, flat curve of spee, greater vertical overlap, 0-0.5mm functional horizontal overlap
- posterior cusps may be long
2) shallow angle, steep curve of spee, lesser vertical overlap, greater than 0.5mm horizontal overlap
- posterior cusps must be short

Question 20

mandibular lateral translation

Answer 20

1) immediate side shift ISS
2) >1 mm, the posterior cusps must be short and central groove wide
3) as the arch is widened, the angle between medio and lateral excursion is increased

Question 21

the greater the intercondylar distance

Answer 21

1) the angle is decreased

Question 22

summary table

Answer 22

1) know it!