Hypodontia Flashcards
What is hypodontia
congenital absence of 1 or more teeth
What is anodontia
complete absence of teeth
What is severe hypodontia
congenital absence of 6 or more teeth
What is missing upper laterals associated with
ectopic canines
Non-syndromic causes of hypodontia
mutations in at least 3 genes associated with missing teeth
Familial
Sporadic
Syndromic causes of hypodontia
e.g. cleft lip and palate, anhydrotic ectodermal dysplasia
Environmental causes of hypodontia
trauma
radiotherapy/chemotherapy
Presentation of hypodontia
delayed/assymetric eruption
retained/infra-occluded/absent deciduous teeth
tooth form
hypodontia associated problems
microdontia/malformation of other teeth
short root anomaly
impaction
enamel hypoplasia
taurodontism
potential problems with hypodontia
spacing
drifting
over-eruption
aesthetics
Functional problems
hypodontia care pathway
GDP recognition
refer to ortho specialist
in GDH- allocate to hypodontia clinic
Hypodontia investigations
Study/planning models
Radiographs
Photographs
Cone beam CT
Management options for space open- missing upper laterals
RBB
Implants
RPD
Conventional bridgework
Autotransplantation
What is the ideal abutment tooth for RBB and why
Canine- root length, crown dimensions, less shine through
Advantages of RBB
Minimal/no tooth prep
No LA
cheaper
Less surgery time
Can be used as provisionals
Less destructive if fails
Relatively simple
do when young
non-destructive
looks good
place on semi-permanent basis
Disadvantages of RBB
Rigorous clinical technique
Metal shine through
Chipping porcelain
Can debond
Occlusal interference
No trial period possible
Failure rate
may not look good
Orthodontic retention needs are high
Implant vs RBB key differences
Can’t do implant till growth ceased- 21+
Need minimum 7mm space
root separation
often need bone graft
Technically very demanding in aesthetic zone
Significant extra time to do/cost
