(5) A missing incisor Flashcards Preview

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Flashcards in (5) A missing incisor Deck (13)
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1
Q

What age should the permanent central incisors emerge?

A

7 years old

2
Q

What is a method to speed up the eruption of permanent successors?

A

Extraction of correspodning deciduous tooth (±adjacent teeth)

3
Q

Illustrate a way to chart the early mixed dentition

A
4
Q

Which region of the oral cavity would you check for the missing central incisor?

A

Upper labial sulcus

5
Q

What are the possible causes of an apparently absent upper central incisor?

A
  • Missing
    • Developmentally absent
    • Extracted
    • Avulsed
  • Failure to erupt
    • Dilaceration and/or displacement as a result of trauma
    • Scar tissue preventing eruption
    • Supernumerary tooth preventing eruption
    • Insufficient space as a result of crowding
    • Pathological lesion
      • Cyst
      • Odontogenic tumor
6
Q

What specific question would you ask to the parent of the patient with missing incisor?

A
  • Trauma-related question (avulsion or dilaceration)
  • Deciduous predecessor discolored?
    • Loss of vitality
  • Previous injury to face/lip/teeth
7
Q

What can cause a shift in the centre line?

A
  • Crowding
  • Early exfoliation of the canines
8
Q

What is dilaceration?

A
  • An angulation, or a sharp bend or curve, in the root or crown of a formed tooth
  • Caused by intrusion
9
Q

Can crowding cause delay in eruption of permanent successor?

A
  • Yes, but it would not delay eruption uf up to 2 years
10
Q

What radiographs would be taken in this instance?

A
  • Dental panoramic radiograph
    • General view
    • Presence/absence of permanent teeth
    • Supernumeraries (?)
  • Periapical radiographs
    • Root morphology
    • Adjacent structures
      • Supernumerary teeth
      • Pathological lesions
    • PA view should include adjacent teeth
    • SLOB rule
  • Lateral view
    • Distrotion of tooth
11
Q

What action would need to be taken if dilaceration was severe?

A
  • Extraction of dilacerated tooth
  • Immediate replacement of incisor by dentureadhesive bridge with permanent restoration or single tooth implant
12
Q

What pre-conditions need to be met for orthodontic realignment (extrusive traction)?

A
  • Dilaceration of tooth not too severe
  • Dilaceration lies in apical portion of the root
13
Q

What factors need to be considered in the selection of a particular treatment?

A
  • Position and seveirty of dilaceration
  • Size of overjet
  • Degree of crowding
  • Position and condition of the other permanent teeth
  • General condition of the mouth
  • Attitude of the child and parent