Issues in Ortho Revision Questions

Question 1

Causes of midline diastema

Answer 1

Missing teeth
Small teeth in large jaw
Peg laterals
Abnormal frenum 
Unerupted supernumraies
Genetic

Question 2

Ideal time to remove 6’s

Answer 2

bifurcation of 7’s
presence of 5’s and presence of 8’s on xrays
Class 1 incisor relationship

Question 3

Why is it the ideal time to remove 6’s

Answer 3

caries free dentition
spontaneous eruption of 7’s and space closure
prevent 7’s eruptiing late
reduction of further ortho

Early removal of 6’s - drifting of 5’s distally
Late removal of 6’s - nothing in space

Question 4

Delayed eruption of permanenet tooth

Answer 4

trauma
supernumary
retained decidous tooth
eruption cysts
abnormal developmental position
unerupted supernumary preventing eruption

Question 5

Ectopic canine indications

Answer 5

not palable in labial sulcus
radiographs indicate ectopic
enlargement of caine follicle
canine crown overlaps the most distal of incisor root
root resorption of decidious canine - not happening

Question 6

Early loss of primary tooth due to

Answer 6

trauma
caries
premature resorption of roots

Question 7

Signs of impacted canine

Answer 7

absence of maxillary canine
decidous maxillary canine still there
protrusion of lateral incisors
absence of bulge on buccal sulcus

Question 8

Consider leaving impacted tooth when

Answer 8

no pathlogy present 
patient declines
no ortho treatment 
contra indications in medical history 
risk of damging adjacent teeth

Question 9

Casues of AOB

Answer 9

habits - digit sucking, thumb sucking
soft tissue - endogenous tongue thrusting
skeletal changes - increased lower anterior face height and localised failure of alveolar growth

Question 10

Upper 1st not erupting, what to do

Answer 10

take medical and dental history
radiographs and exam
palpate buccal sulcus
maintain space
refer for ortho
surgical exposure
bond with gold chain
monitor for 1.5years

Question 11

Management of non eruption incisors

Answer 11

create space
bonded retainer
surgical exposure
remove supernurmary 
monoitr 1.5 years

Question 12

Cleft lip and palate

Answer 12

Requires orthognathic surgery

can cause cross bite

Question 13

Determine unerupted tooth present

Answer 13

absence of maxillary canine
decidous maxillary canine still there
protrusion of lateral incisors
absence of bulge on buccal sulcus