mg of ectopic mx canine

Question 1

normal maxillary canines development

Answer 1

starts development at 4-5mns 
long path of eruption
palpable in the buccal sulcus at 9/10 yrs
erupt 11-12 yrs (md canine 10-11)
width 7-9mm

Question 2

where can canines be displaced

Answer 2

buccally or palatally

Question 3

aetiology of displaced canines

Answer 3

familial/genetic
long eruption path (more chance to go in the wrong direction)
guidance theory (missing or peg shaped laterals)
crowding (chronology of eruption, narrow upper arch)
lack or resorption of primary tooth
follicular disturbance

Question 4

assessing the ectopic canines

Answer 4

clinical

radiographically

Question 5

clinical assessment of canines/ectopic

Answer 5

palpation in the sulcus
mobility of primary tooth, if C wobbly root is being resorbs therefore more likely to erupt correctly
adequate space
angulation of lateral

Question 6

radiographic assessment of canine

Answer 6

location of canine - OPT, upper standard occlusal - parallax required
resorption of primary tooth

Question 7

parallax canine tooth

Answer 7

same lingual opposite buccal

• Tube head moves from horixontal to 65 degrees
• position of the canine appears as if it has changed (relative position)
• Canine tip roughly halfway on the OPG
• upper standard occlusal, appear close to the bottom corner of the incisor roots

This case the canine has appeared to move upwards
- therefore it is in the lingual/palatal position

Question 8

complications of canines

Answer 8

root resoprtion
anklyosis
cysts

Question 9

management of acrostic canines

Answer 9

leave (milder cases or severe position but away from roots of teeth)
intervention
extract
orthodontic alignment 
transplant

Question 10

orthodontic aligment options

Answer 10

open exposire
closed exposure
create space - encourage natural eruption w fixed appliances

Question 11

open exposure

Answer 11

cut window in gum
pack gauze and suture
attach to canine and pull into position

Question 12

closed exposure

Answer 12

bond gold chain
tries to get bone to attach to gold chain
gum stitched, pulled through gum

Question 13

buccal canines ortho alignment options

Answer 13

closed exposure - attach gold chain

open exposure - apically repositioned flap - place attachment on the tooth to bring it in position

Question 14

indications for transplantation

Answer 14

canine ankylosed (therefore ortho won’t work)
patient not subtitle for ortho
poor prognosis primary canines
adequate space (just not in correct position)
no over eruption of opposing teeth
too misaligned for othodontics