Hypodontia Flashcards
definition of hypodontia
congenitally missing one or more teeth
definition of andodontia
complete absence of teeth
definition of severe hypodontia
six or more congenitally absent teeth
what percentage of population does hypodontia affect
6%
what are the most effected teeth by hypodontia
L5s
U2s
L5s
lower incisors
what is the link between the teeth that are most commonly missing
usually the last in the series
what is the lateral incisor mesio-distal width
around 7mm
what percentage of the population is affected by missing laterals
2%
what is the non-syndromic aetiology of hypodontia
mutations of at least 3 genes associated with missing teeth
familial
sporadic
what syndromes are associated with hypodontia
cleft lip and palate
anhydrotic ectodermal dysplasia
what environmental factors are associated with hypodontia
trauma
radiotherapy/ chemotherapy
state four ways in which hypodontia can present
delayed/ asymmetric eruption
disorder of sequence of eruption
retained or infra-occluded deciduous teeth
absent deciduous teeth
when should a patient with microdontia be referred
when there has been an abnormal presentation (sequence/ infraocclusion)
lack of space
what problems are associated with hypodontia
microdontia
short roots
impaction
delayed formation
taurodontism
what is taurodontism
elongated pulp chamber - particularly found in the 7s
what investigations are used in the management of a hypodontia patient
study models
radiographs
photographs
cone beam CT
what are the treatment options for managing hypodontia
accept
restorative treatment only
orthodontic treatment only
orthodontic and restorative treatment
what are the options for managing hypodontia when using a restorative and orthodontic approach
open or close space
what is the MDT management of missing upper laterals with space open
RBB
implant
partial denture
what is the MDT management of missing upper laterals with space close
simple closure
space close plus
what is the benefit of using partial dentures in hypodontia cases
useful if multiple teeth missing
not as destructive to tooth surface
intermediate option
what is a disadvantage of partial dentures for hypodontia cases
you have to wait at least 3 months after treatment before using
what is the benefit of using RBB for hypodontia cases
more forgiving of size discrepancies
simple
can do when young and looks good
what are the disadvantages of treatment of hypodontia with a RBB
failure rate is high - if they fail they are going to fail early
patients have to be good at wearing a retainer
how much space do you ideally require for implant treatment of hypodontia cases
7mm
from what age can you offer implants
21 realistically but better to get when 23+ and sure growth has stopped
