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Canines Flashcards

1
Q

What is the definition of Impacted?

A

Tooth prevented from erupting due into it’s normal functional position due to:
• Bone
• Tooth
• Fibrous Tissue

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2
Q

What is the prevalence for palatal canines?

A

85%

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3
Q

What is the prevalence for buccal placed canines?

A

15%

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4
Q

Which gender is more common for impacted canines and what is the prevalence?

A

Females
2:1
70/30

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5
Q

What is the most common side for an Impacted canine and what is the prevalence:

A

Left
More common to be unilateral
4:1

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6
Q

What is the prevalence for congenital absent canines in the maxillary arch?

A

0.3%

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7
Q

What is the prevalence for congenital absent canines in the mandibular arch?

A

0.1 %

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8
Q

What is the prevalence of impacted canines in maxillary arch?

A

2%

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9
Q

What is the prevalence of an impacted canine in the mandibular arch?

A

0.35%

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10
Q

What is the prevalance of resorption of the upper incisors in 10-13 year olds?

A

0.7%

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11
Q

Development- what age do the canines start to develop?

A

4/5 months of age

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12
Q

Where is the position of the canine when developing?

A

High in the maxilla

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13
Q

Development- what age does calcification start?

A

6/7 years old

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14
Q

What age should the upper canine be palpable?

A

Before 11

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15
Q

What age should the lower canine be palpable?

A

Before 9

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16
Q

What are the eruption dates for the upper canine?

A

11-12

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17
Q

What are the eruption dates for the lower canines?

A

9-11

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18
Q

Eruption- when the upper canine migrates what direction does it take?

A

Forwards and downward

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19
Q

Eruption- After migrating, where does the canine lie regarding the deciduous canine?

A

Buccal and Mesial

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20
Q

Eruption- when erupting where is the canine positioned regarding the lateral?

A

Distal aspect of the root

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21
Q

Aetiology- what are the main cause of Impacted Canines? (6)

A
  1. Displacement of Crypt
  2. Long path of eruption
    3.Guidance - absent lateral or short roots
  3. Crowding
  4. Genetics
  5. Retained deciduous canines
22
Q

If crowding is present where is the canine likely to be positioned in the arch?

23
Q

What three positions can a canine erupt or be positioned?

A
  1. Buccal
  2. Palatal
  3. Horizontal
24
Q

What is the prevalance of short rooted or missing laterals?

25
List 6 Associations with Impacted canines
1. Hypodontia 2. Microdontia 3. IIii incisors 4. Genetic 5. Lack of space 6. Resorption
26
Assessment of Impacted canines
1. Palpate? ⬆️ before 11 ⬇️before 9 2. Deciduous canine sturdy and mobile? 3. Microdontia? 4. Crowding? 5. Mobility U 2-2?
27
Radiographs taken for Impacted Canines? (6)
1.OPG 2. Periapical 3. Upper Standard Occlusal 4. Lateral Cephlogram 5. Vertex Occlusal 6. CBCT
28
What Radiograph Technique is used for Impacted Canines?
Parallax Technique
29
What are the two types of Parallax Technique?
1. Horizontal 2. Vertical
30
What is the Horizontal Parallax Tecnique?
• Tube head moves Horizontal • left to right • 2 pa’s •2 pa’s + upper standard occlusal
31
What is the Vertical Parallax Technique?
• Tube head moves vertical • OPG= upwards 8 degrees • Upper Occlusal = downwards 65 degrees
32
What does SLOB mean?
SAME LINGUAL OPPOSITE BUCCAL
33
What is the average angle of a canine?
25 degrees
34
What is the biggest risk associated with Impacted Canines?
Resorption
35
Most teeth are most common with resorption from the impacted canines?
•Lateral incisor • Can progress to Upper Centrals
36
What gender is resorption more common in?
Females
37
Interception trt of good buccally placed unerupted canines
1. Palpate? 2. OPG 3. XLA of decidious c 4. Space maintainer
38
Buccally displaced Canines?
• Associated with crowding • Canine = > 1st premolar and C= Crowding • Buccal Mucosa and bone is thinner • Severely displaced = xla
39
Trt options for Palatally placed Canines?
• surgical extraction • expose, bond and align • Auto transplantation
40
Indications for open/closed exposure?
1. Motivated and compliant pt 2. Good OH and dentition 3. Favourable position 4. Space available?
41
Favourable canine position depends on 4 things:
1. Height 2. A/P position 3. Apex position 4. Inclination
42
What are the height factors in an impacted canine?
• Higher the canine from the occlusal plane = poor prog • if the crown is above the apical 1/3 of the incisor roots= poor prog
43
What Anterior Posterior factors effect Orthodontic treatment of an impacted canine?
• if closer to the midline= poor prog • lies halfway over the central incisor= poor prog
44
The position of the apex of a impacted canine must not be…
Poor prog= • further away than usual apex position • Distal to the 2nd premolar
45
What is important with the inclination of the impacted canine?
If the angle to the occlusal plane decreases the greater need for traction is needed
46
Describe an Open exposure?
• used for good positioning • tissues left open and packed • attachment placed in ortho practice + traction
47
Describe a closed exposure?
• canine uncovered+ gold chain bonded • stitched back up • chain attached to wire in ortho practice
48
What transposition can occur with canines?
Upper= 1st premolar and lateral Lower= lateral
49
What is true transposition?
Roots and crown completely interchanged
50
What is false Transposition?
Roots in the correct position CROWNS have interchanged
51
What is Auto transplantation?
• surgically removed and reposition into the alveolar bone
52
Risks associated with Autotransplantation?
• inflammatory response= death of pulp tissue • Resorption •Ankylosis

Orthodontic Therapy (29 decks)

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