mandibular movements

Question 1

factors and forces that determine tooth position

Answer 1

lips and cheeks
tongue
tooth size
proximal contact
occlusal contact
arch width

Question 2

occlusal plane

Answer 2

imaginary surface related anatomically to the cranium which theoretically touches the incisal edges of the incisors and the tips of the cusps of the posterior teeth

not a flat surface

Question 3

bonwill’s triangel

Answer 3

4 inches between the center of the condyles = base of triangle
4 inches from each condyle to the mesial contact area between the mandibular central incisors - sides of the tirangel

Question 4

anterior teeth are inclined

Answer 4

facially

Question 5

all teeth are inclined

Answer 5

mesially (except max 3rd molars)

Question 6

mandibular posterior

Answer 6

inclined lingually

Question 7

max posterior

Answer 7

inclined facially

Question 8

inner aspect of a posterior tooth

Answer 8

area between the cusp tips (occlusal table)

Question 9

bucco-occlusal line

Answer 9

an imaginary line extended through all the buccal cusp tips of the mandibular posterior teeth

represents the general arch form

demaration between the inner and outer apects of the buccal cusps

Question 10

lingo-occlusal line

Answer 10

an imaginary line extedned through the lingual cusp tips of (maxillary) posterior teeth

represents the general arch form

demarcation betwen outer and inner aspects of lingual cusps

Question 11

central fossa line

Answer 11

an imaginary line extended through the central developmental grooves of the maxillary and mandibular posterior teeth

represents the general arch form

proximal contact areas are generally located slightly buccal to the C-F line

Question 12

anterior guidance

Answer 12

the anterior contacts provide guidance of the mandible

this is affected by horizontal overlap and vertical overbite

Question 13

eccentric movement

Answer 13

any movement of the mandible from the intercuspal position

Question 14

three basic eccentric movements

Answer 14

laterotrusive
protrusive
retrusive

Question 15

working side

Answer 15

rotating side

Question 16

meditrusive

Answer 16

nonworking

Question 17

laterotrusive

Answer 17

working

Question 18

laterotrusive contacts

Answer 18

can occur between the inner inclines of the maxillary buccal cusps and the outer inclines of the mandibular and buccal cusps

AND
between the outer inclines of the maxillary lingual cusps and the inner inclines of the mandibular lingual cusps

Question 19

mediotrusive contacts

Answer 19

can occur between the inner inclines of the maxillary lingual cusps and the inner inclines of teh mandibular buccal cusps

Question 20

protrusive

Answer 20

mandibular movement that occurs when the mandible moves forward from maximum intercuspation to an edge to edge position of the central incisors

Question 21

retrusive

Answer 21

when the mandible moves in a posterior direction from the maximum intercuspation position