space maintainers

Question 1

leeway space

Answer 1

difference in space from primary molars to perm premolars

2.5mm per side in man, 1.5-2mm in the max arch

Question 2

leeway space of nance

Answer 2

difference in space from the from the primary canine and primary molars to perm canine and premolars
1.7mm per side in mand arch and 0.9 in max arch

Question 3

importance of leeway space

Answer 3

relieve crowding

if not preserved, perm molars will drift mesially

Question 4

early mesial shift

Answer 4

the eruptive force of the perm molar causes mand spaces to close allowing perm molar to shift into class 1

Question 5

late mesial shift

Answer 5

when no primate spaces exist, the perm molar shift occurs when the second prim molar exfoliates in the mand before the max

Question 6

primate space

Answer 6

m to max canine, d to mand canine

Question 7

serial extractions

Answer 7

way to manage crowding w/o ortho

1st step in tx for fixed ortho

Question 8

when should serial extractions be considered

Answer 8

when crowding is greater than 10mm per arch

Question 9

what type of dental and skeletal pattern should pts have when considering serial extractions

Answer 9

class I

Question 10

t/f. guidance eruption does not correct skeletal problems

Answer 10

true

Question 11

what teeth should be removed first in serial eruptions

Answer 11

primary canines

Question 12

what type of tx are space maintainers

Answer 12

passive

Question 13

what type of tx is orth

Answer 13

active

Question 14

when should you consider space maintenance

Answer 14

loss of primary molars or primary canines

Question 15

why use a distal shoe

Answer 15

to maintain the space of a primary second molar that has been lost before the eruption of the perm first molar

Question 16

t/f an ectopic eruption of a perm molar can’t self correct

Answer 16

false. they can, about 60-66% do so

Question 17

criteria to extraction a primary molar

Answer 17

primary molar is mobile
more than 3mm of mesial drift of perm molar
primary root resorption moderate to severe

Question 18

crossbite

Answer 18

maloccusion which involve 1 or more teeth in which the max teeth occlude lingually with the mand antagonistic teeth

Question 19

crossbite correction benefits

Answer 19

reduce dental attrition
improve aesthetics
redirect skeletal growth
improve the tooth-to-alveolus relationship
increase arch perimeter
improve eruption position