Maxillary Ectopic Canines

Question 1

Prevalence

Answer 1

2%:

61% palatal
34% LOA
4.5% Buccal

Unilateral:Bilateral – 4:1

F: M – 70:30

II:II malocclusion

Question 2

Root resorption

Answer 2

Crowding/shortening of arch length
Adjacent lateral incisor missing or abnormal in shape/size
Long path of eruption
Palatal - genetic
Buccal - inadequate arch space

Question 3

Parallax

Answer 3

Index of suspicion is raised if the pt has a missing, or abnormally shaped lateral incisor’ has spaced arches, or if palpation indicates an asymmetrical eruption.

Clinical signs:
- Delayed eruption of 3s or prolonged retention of C
- Absence of normal labial 3 bulge or presence of palatal bulge in 3 region
- Delayed eruption, distal tipping/migration of the lateral incisor
- Loss of vitality and increased mobility of the central/lateral incisor

Question 4

Horizontal parallax

Answer 4

2 IOPAs
Ant Occlusal and IOPA

Question 5

Vertical Parallax

Answer 5

Ant occlusal and DPT
IOPA and DPT

Question 6

Ortho tx risks

Answer 6

Risk of resorption to adjacent teeth (lat incisor and 1st premolar)
Risk of pulp obliteration to canine and adjacent teeth causing colour mismatch
risk of discontinued treatment due to prolonged treatment times
Canine ankylosis
high tendency to relapse