Hypodontia Flashcards
Why may an orthodontist plan to open space rather than close in a hypodontia case?
- position of adjacent teeth/intercuspation
- space closure maybe slower
- opinion of patient
- function of teeth
- age of patient
- aesthetics
- space may not fully close
What are the causes of hypodontia?
- genetics
- local factors - cleft lip and palate
- syndromes - downs, hemifacial microsomnia
What clinical features to look out for with hypodontia patients?
- retained primary teeth beyond exfoliation time
- primary teeth missing
- asymmetric eruption
- delayed eruption
- small permanent teeth (microdontia)
- infraoccluded primary teeth
- spacing in arch
What is microdontia?
Small teeth
What is hypodontia?
Developmental absence of one or more teeth
What percent of the population a missing lateral incisors?
2%
What percent of the population are missing third molars?
25%
How is hypodontia classified?
- mild 1-2
- moderate 3-5
- severe 6+
What are the advantages of opening space in a hypodontia patient?
- may not be possible to close all spaces
- function and occlusion - favouring good intercuspation
- improved aesthetics
What are the disadvantages of space opening in hypodontia patients?
- commits patients to fixed appliances
* commits patients to permanent prosthesis
What are the advantages of closing spaces in hypodontia patients?
- no long term prosthesis
* maybe incorporated into extraction pattern if malocclusion dictates
What are the disadvantages of space closing in a hypodontia patient?
- aesthetics
- space may not close fully
- space closure maybe slow
Why may an orthodontist plan to open space rather than close space for a missing lateral incisors?
- aesthetics
- better occlusion and function
- space may not fully close
- space closure may be slow
- age of patient
- patient/family opinion and preference
Place in order from 1- most common to 5- least common Upper lateral incisor Upper second premolar Lower second premolar Lower canine Lower third molar
- Lower third molar
- Lower second premolar
- Upper lateral incisor
- Upper second premolar
- Lower canine
What is a Kesling set up?
- used prior to treatment
* duplicates study models and can show the final outcome after treatment
