Hypodontia

Question 1

Aetiology:

Answer 1

 Multi-functional
 Genetic - family history
 Environmental – Absences associated with CLP

Question 2

Management:

Answer 2

1. deciduous teeth

• If severe – denture for aesthetic and function,
• psychological help
• Before school starts.

2. Mixed dentition

• Closely monitored
• U 3’s impaction if 2’s missing. Small
• Provide dentures
• Build microdonts
• Close spaces

3. Permanent

• Mild cases –ortho
• Severe cases – prosthodontist + ortho
• Fixed appliances
• Close/open space
• Retain deciduous teeth with good long term prognosis
• Parallel roots for implants.

Question 3

Prevalence:

Answer 3

	Deciduous teeth= 0.3 – 0.9%
	Permanent teeth = 3.5 – 6.5%
	Mild= 1-2 teeth 80%
	Moderate = 3-5 teeth 10%
	Severe = > 6 teeth 1%
	Caucasians L5>U2>U5>L12
	Asia L incisors

Question 4

Associations:

Answer 4

 Skeletal III – retrusive maxilla, reduced LAFH - increases with hypodontia
 Delayed dental developmental – 5’s are prone to be delayed in developmental, may not be visible on x ray until 9, no rush with decisions.
 Microdontia – localised/ generalised, severity is correlated with hypodontia.
 Taurodontism – developmental anomaly – roots of molars are short, elongated pulp chamber, more root resorption
 Alveolar atrophy
 Max canine impaction
 Abnormal tooth position – overeruption of space opposite tooth, migration in spaces, rotations.
 Transposition

Question 5

Hypodontia definition

Answer 5

Developmental absence of primary or permanent teeth excluding third molars