Anomalies in Ortho

Question 1

Supernumeray
- definition
- incidence
- classification

Answer 1

additional teeth

2:1 males
maxilla 5:1 mandible

classification
1. form
- supplemental - extra normal tooth
- conical - early forming and peg-shaped
- tuberculate - late forming and barrel shapes
- odontome - compound - many small separate teeth (usually anterior) or complex - compound mass of enamel and dentine (usually posterior)

2. site
   - mesiodens - midline
   - paramolar - adjacent to the molars
   - distodens - distal to the arch

Question 2

Conical Supernumerary
- where is the usual site
- when does it form?
- are they likely to cause damage?

Answer 2

usually mesiodens

• the root formation is usually ahead or with the permanent incisor

not likely to cause damage

Question 3

Tuberculate Supernumerary
- shape
- when does it form?
- where it the usual site
- tx

Answer 3

barrel shappel

forms palatal
root formation is delayed compared to the permanent incisor

• likely to empede eruption
• usually needs to be removed

Question 4

conditions associated with Supernumeraries

Answer 4

Cleft Lip and Palate

Gardener Syndrome
- multiple polyps in the colon and tumours elsewhere

Cleidocranial Dysplasia
- collarbones to be partly or completely missing
- hypoplastic maxilla

Question 5

what are the issues with supernumeraries?

Answer 5

can:
- impede eruption of the teeth
- cause displacement
- produce spacing
- contribute to crowding
- cause cysts