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Orthodontic Therapy > Canines > Flashcards

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?

A

Buccally

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?

A

42.6%

25
Q

List 6 Associations with Impacted canines

A
  1. Hypodontia
  2. Microdontia
  3. IIii incisors
  4. Genetic
  5. Lack of space
  6. Resorption
26
Q

Assessment of Impacted canines

A
  1. Palpate? ⬆️ before 11 ⬇️before 9
  2. Deciduous canine sturdy and mobile?
  3. Microdontia?
  4. Crowding?
  5. Mobility U 2-2?
27
Q

Radiographs taken for Impacted Canines? (6)

A

1.OPG
2. Periapical
3. Upper Standard Occlusal
4. Lateral Cephlogram
5. Vertex Occlusal
6. CBCT

28
Q

What Radiograph Technique is used for Impacted Canines?

A

Parallax Technique

29
Q

What are the two types of Parallax Technique?

A
  1. Horizontal
  2. Vertical
30
Q

What is the Horizontal Parallax Tecnique?

A

• Tube head moves Horizontal
• left to right
• 2 pa’s
•2 pa’s + upper standard occlusal

31
Q

What is the Vertical Parallax Technique?

A

• Tube head moves vertical
• OPG= upwards 8 degrees
• Upper Occlusal = downwards 65 degrees

32
Q

What does SLOB mean?

A

SAME
LINGUAL
OPPOSITE
BUCCAL

33
Q

What is the average angle of a canine?

A

25 degrees

34
Q

What is the biggest risk associated with Impacted Canines?

A

Resorption

35
Q

Most teeth are most common with resorption from the impacted canines?

A

•Lateral incisor
• Can progress to Upper Centrals

36
Q

What gender is resorption more common in?

A

Females

37
Q

Interception trt of good buccally placed unerupted canines

A
  1. Palpate?
  2. OPG
  3. XLA of decidious c
  4. Space maintainer
38
Q

Buccally displaced Canines?

A

• Associated with crowding
• Canine = > 1st premolar and C=
Crowding
• Buccal Mucosa and bone is thinner
• Severely displaced = xla

39
Q

Trt options for Palatally placed Canines?

A

• surgical extraction
• expose, bond and align
• Auto transplantation

40
Q

Indications for open/closed exposure?

A
  1. Motivated and compliant pt
  2. Good OH and dentition
  3. Favourable position
  4. Space available?
41
Q

Favourable canine position depends on 4 things:

A
  1. Height
  2. A/P position
  3. Apex position
  4. Inclination
42
Q

What are the height factors in an impacted canine?

A

• 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
Q

What Anterior Posterior factors effect Orthodontic treatment of an impacted canine?

A

• if closer to the midline= poor prog
• lies halfway over the central incisor= poor prog

44
Q

The position of the apex of a impacted canine must not be…

A

Poor prog=
• further away than usual apex position
• Distal to the 2nd premolar

45
Q

What is important with the inclination of the impacted canine?

A

If the angle to the occlusal plane decreases the greater need for traction is needed

46
Q

Describe an Open exposure?

A

• used for good positioning
• tissues left open and packed
• attachment placed in ortho practice + traction

47
Q

Describe a closed exposure?

A

• canine uncovered+ gold chain bonded
• stitched back up
• chain attached to wire in ortho practice

48
Q

What transposition can occur with canines?

A

Upper= 1st premolar and lateral
Lower= lateral

49
Q

What is true transposition?

A

Roots and crown completely interchanged

50
Q

What is false Transposition?

A

Roots in the correct position
CROWNS have interchanged

51
Q

What is Auto transplantation?

A

• surgically removed and reposition into the alveolar bone

52
Q

Risks associated with Autotransplantation?

A

• inflammatory response= death of pulp tissue
• Resorption
•Ankylosis

Orthodontic Therapy (26 decks)

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