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BDS4 ORTHODONTICS > CLASS III > Flashcards

CLASS III Flashcards

1
Q

What is the definition of a Class III malocclusion according to BSI?

A
  • lower incisor edge occludes anterior to the cingulum plateau of the upper CI
  • the overjet is reduced or reversed
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2
Q

What is the aetiology of Class III malocclusion?

A
  • strong genetic link
  • cleft lip & palate
  • acromegaly
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3
Q

What is the aetiology of a Class III skeletal malocclusion?

A
  • small maxilla (maxillary hypoplasia)
  • large mandible (mandibular prognathism)
  • combination of both
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4
Q

How does a class III malocclusion usually present tranversely?

A

Bilateral crossbite (sometimes)

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5
Q

What are the dental features of a Class III malocclusion?

A
  • Class III molar relationship (not always)
  • tendency to reverse overjet
  • reduced overbite
  • anterior open bite (sometimes)
  • crossbites (anterior/buccal)
  • altered alignement
  • dentoalveolar compensation
  • tendency for displacements on closing
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6
Q

How does alignment usually present in patients with Class III malocclusion?

A
  • maxilla often crowded
  • mandible often aligned or spaced)
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7
Q

What can dentoalveolar compensation present as in class III malocclusion?

A
  • proclined upper incisors
  • retroclined lower incisors
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8
Q

Why do we treat a class III malocclusion?

A
  • aesthetics
  • dental health (risk of attrition, gingival recession or mandibular displacement)
  • function (speech & mastication issues)
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9
Q

What are some factors that can make treatment of Class III malocclusion more difficult?

A
  • > number of teeth in anterior crossbite
  • skeletal element in aetiology
  • > in the A-P discrepancy
  • presence of AOB
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10
Q

Why should you wait until growth has stopped before treating Class III malocclusion?

A
  • mandibular growth continues for longer
  • potential for class III to get worse
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11
Q

What does the onset of the pubertal growth spirt coincide with?

A

spurt in jaw growth

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12
Q

What are the management options for Class III malocclusions?

A
  • accept/monitor
  • intercept early with URA
  • growth modification
  • camouflage
  • combined orthognathic/orthodontic tx
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13
Q

When would you accept/monitor a class III occlusion?

A
  • no concerns
  • no dental health indications
  • mild cases
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14
Q

When would you use interceptive treatment for a class III occlusion?

A
  • suitable if class III incisors have developed due to early contact on permanent incisors
  • use of URAs
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15
Q

What functional appliances are used as growth modification for Class III malocclusion?

A
  • chin cup
  • reverse twin block
  • Frankel III
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16
Q

What features are on a Frankel III?

A
  • shields labial to upper incisors to hold lip away
  • palatal arch to procline the upper incisors
  • lower labial bow to retrocline the lower incisors
17
Q

How is protractor headgear used for treatment of class III malocclusion?

A
  • 14 hours/day protraction facemask
  • 400g per side
  • best results when used in early mixed dentition
  • patient must be cooperative
18
Q

What is meant by orthodontic camouflage of a Class III malocclusion?

A

Accept underlying skeletal base relationship:
- aim for class I incisors

19
Q

What are some favourable features for camouflage treatment of a class III malocclusion?

A
  • growth stopped
  • mild to moderate Class III skeletal base ANB not <0
  • average or increased overbite
  • able to reach edge to edge incisor relationship
  • little or not dentoalveolar compensation
20
Q

How can orthodontic camouflage be achieved in a class III malocclusion patient?

A
  • extract further back in upper arch
  • extracted further forward in the lower arch
21
Q

What is the aim of orthodontic camouflage in treatment of Class III malocclusion?

A
  • procline upper incisors
  • retrocline lower incisors
  • corect overjet
22
Q

Who is involved in the multidicisplinary team for orthognathic surgery?

A
  • orthodontist
  • maxillofacial surgeon
  • technician
  • psychologist
23
Q

what is involved in presurgical orthodontics before orthognathic treatment?

A

Level, align, co-ordinate & decompensate

24
Q

what is the role of a GDP in class III malocclusion?

A
  • identify class III malocclusion
  • refer to hospital service or specialist practitioner

(potential URA treatment)

25
Q
A

BDS4 ORTHODONTICS (12 decks)

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