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Orthodontics > Canine > Flashcards

Canine Flashcards

1
Q

Normal development of upper 3s

A
  • Development of Upper 3s - 4-5 months high in maxilla
  • Crown calcification complete - 6-7 years
  • The upper 3s then migrate forward and downwards to lie BUCCAL and MESIAL to upper C.
  • They erupt down the DISTAL aspect of upper 2.
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2
Q

Eruption date of Canine

A
  • Upper 3s . 11-12 yrs
  • Lower 3s 10- 11 years
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3
Q

Abnormal development of Canine

A
  • Hypodontia
  • Impaction
  • Transposition
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4
Q

Hypodontia

A
  • Development absence of Upper 3s is rare 0.3% Caucasian
    -Lower more rare 0.1%
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5
Q

Impaction

A
  • 2% upper 3s impacted
    -8% bilateral Impaction.

0.35% of lower 3s

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6
Q

Ectopic Canine

A
  • Occruing in abnormal position
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7
Q

Impacted Canine

A
  • Canine that is prevented into its normal functional position by bone , tooth or fibrous tissue.

-Canine teeth may take ectopic eruption path and become Impacted.

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8
Q

Ectopic and impacted Upper 3s

Palatal percentage

A
  • 61% palatal
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9
Q

Line of arch percentage?

A
  • 34%
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10
Q

Buccal

A

5%

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11
Q

Unilateral: Bilateral

A

4:1

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12
Q

Femal : Male

A

70:30 more common in female

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13
Q

Aetiology of Ectopic and Impacted canine.

A

1- Long path of eruption of upper 3

2- Development absence hypodontia or short upper 2 ( Double the chance of palatally impacted upper 3s these patients due to lack of guidance during eruption. 42.6% chance

3- Genetic Predisposition

4- crowding / shortening of length or arch

5- Palatal = genetics , Buccal = inadequate arch space.

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14
Q

Problem associated with impacted 3s

A
  • Resorption of adjacent tooth
  • Cystic changes
  • Long and complex treatment
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15
Q

Resorption of of adjacent teeth

A
  • Upper 2s 1s or Both
  • 2D-Radiographs 12% damage to adjacent lateral incisors

CBCT 3d rad- 66% resorption of U2s.
11% Upper 1s.

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16
Q

Cystic change

A
  • resulting in damage to adjacent structure / teeth
17
Q

2 Main theories Aetiology of Canine

A
  • Guidance theory ( distal aspect of Upper 2 root)
  • Genetic theory
18
Q

What to watch out?
Diagnosing ectopic Canines

A

1- Upper 3s not palpable in buccal sulcus by age of 9-10 yrs.
2- Is upper C mobile?
3- Is the 3 on opposite side erupted ? 6 month rule.
4- Missing or small upper 2s.
5- Distal tipping or migration of Upper 2s
6- loss of vitality and increase mobility of U2 and 1.
7- Colour / angle of adjacent teeth

19
Q

Diagnosing of ectopic Canine

Radiographically

A
  • DPT / IOPA/ USO - Parallax / CBCT
20
Q

When do we investigate for Impacted canine?

A
  • If canine not palpable buccally at age of 9-10 yrs then investigate
21
Q

How do we investigate impacted canine?

A
  • Look , Observe - bulge, inclination and colour of lateral incisors.
  • Palpation of canine crown - Buccal and palatal
  • Mobility of UC or U2s
22
Q

Radiographs to establish?

A

P3 rule - Presence , position and pathology

23
Q

Which Radiograph to diagnose Impacted canine?

A
  • Normal to use vertical or horizontal parallax to localise using:

-2 PA ( atleast 20 degree tube shift needed)

  • Upper anterior occlusal + Peri apical
  • Upper anterior occlusal + DPT
  • Horizontal parallax b/w 2 periapicals - SLOB - Tube shift to right, Canine moved to right with tube then PALATAL POSITION.
24
Q

Interceptive treatment define?

A
  • Any treatment which eliminates or reduce the severity of developing malocclusion.
  • Which may reduce the need for further treatment or simplify it
25
Q

Chance of normalising of ectopic upper 3?

A
  • Extraction of C in child age 10-13 years in Uncrowded mouth increase chance of normalisation of ectopic upper 3.
  • Both C is often extracted to preserve centreline. Balancing extraction
  • Improvement in Upper 3 position should be noted in 9-12 months following extractions of upper C.
26
Q

Predictors of success of interceptive treatment

A
  • Age - 10- 13 years
  • Postion of canine
  • Degree of crowding
27
Q

Success of interceptive treatment Factor

2- Postion of Canine.

A
  • Proximity to midline - Increased overlap of U2 decrease chance of normalising.
  • Angulation (Tip) - Increased mesioangular angle decrease chance of normalising height
  • Height - Increased height decrease chance of normalising
28
Q

3- Crowding

A
  • more crowding decrease chance of normalising
29
Q

Buccally impacted U3s

A
  • Ussually related to Crowding.
  • Buccally placed Upper 3s more like to erupt over than palatal 3s due to thinner over lying of mucosa
  • Relief of crowding part of treatment aim
  • Can cause resorption of U2s
  • In rare cases ankylosed

Orthodontics (45 decks)

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