interceptive ortho

Question 1

primary dentition problems

Answer 1

delayed eruption
missing teeth 
supernumerary teeth 
abnormal teeth  (fusion or germination)
overjet
crowding
class III
cross bites
caries/trauma
habits

Question 2

what is the timeline for teeth ortho wise

Answer 2

1) primary
2) early mixed
3) late mixed
4) permanent dentition

Question 3

when is delayed eruption a problem

Answer 3

contralateral side different

abnormal sequence of eruption

Question 4

cross bites persist in

Answer 4

skeletal rather than dental

Question 5

size difference between upper and lower arch primary v permaentn

Answer 5

upper 7mm greater

lower 5mm greater

Question 6

what does early loss of primary teeth do and what is needed to be considered

Answer 6

impacts centre lines
apart from second primary molar - has no effect on centre line

Balancing extractions - sam tooth contralateral side
compensating extractions - same tooth opposing arch to prevent over erupting
space maintenece

dont compensate in primary

Question 7

treatment options for impacted first molar

Answer 7

disimpact UR6

extract E - however 6 will come in mesially, insufficient space for 5 to erupt later

Question 8

median diastema causes

Answer 8

normal
supernumerary tooth 
generalised spacing 
proclined upper incusors
trauma
pathology (cysts, tumours)

Question 9

crowding in the early mixed dentiton

Answer 9

incisors can erupt lingually, incisor canines can be retained leading to crwodign

Question 10

indications for extraction of primary canines

Answer 10

permit lateral incisor to alig
allow incisor to be moved over the bite
potential to improve the position of palatally displaced permanent canines

Question 11

how to treat posterior crossbite

Answer 11

URA
midline expansion screw
acrylic baseplate for anchorage

Question 12

class III early mixed dentition stage tx

Answer 12

apply force to MX
headgear under age of 10
refer to ortho specialist

Question 13

ectopic canines late mixed dentition stage

Answer 13

refer at time of diagnosis
can cause harm to lateral/incisal incisors if left
screen every 9yr old for palpitation of mx canines bucally
refer to ortho if evidence of ectopic position

Question 14

signs of ectopic canines

Answer 14

c not resorbing

Question 15

effect of digit sucking

Answer 15

• proclination of upper incisors
• anterior open bite
• unilateral posterior cross bite
• increased overjett

Question 16

infraoccluced teeth in late mixed dentiton

Answer 16

monitor and extract under LA if permanent tooth underneath

Question 17

digit sucking breaking appliances

Answer 17

passive removable appliance
fixed appliance (primarily for correction of AOB)

Question 18

problems in the permanent dentition with treatment

Answer 18

lack of growth (tx slower)
mutilased dentition determining extraction patterns, reduced periodontal support, periodisease
cooperation difficult
different expectations

Question 19

list of problems with early mixed dentiton

Answer 19

delayed eruption
early loss
1st permanent molars
medial diastema
increased overate
crowding
anterior crossbite
posterior crossbite
habits 
class III

Question 20

late mixed dentition list of problems

Answer 20

missing teeth 
infraoccluded teeth 
crowding
poor quality 6s
ectopic canines
habits
increased overjet