Hypodontia Flashcards
Define hypodontia
Congenitally absent presence of one or more teeth
Define anodontia
Complete absence of ALL teeth
Most common missing tooth
U2s
Aetiology of hypodontia
Syndromic
- CL(P)
- Down syndrome
- Ectodermal dysplasia
- Craniofacial syndromes
Environmental
- Trauma
- Radio/chemo
Presentation of hypodontia
Delayed or asymmetric eruption
Retained or infra-occluded deciduous teeth
Absent deciduous tooth
Tooth form
Associated dental problems with hypodontia
- Microdontia
- Short root anomaly
- Impaction
- Crowding
- Spacing
- Enamel hypoplasia
- Over-eruption
- Aesthetic impairment
- Functional problems
- Delayed formation+/- delayed eruption of other teeth
Early intervention for Hypodontia
- XLa of retained primary teeth
- Sectional fixed appliance to close space
- Allow eruption of present teeth
Investigations for Hypodontia
- Radiographs OPT for root morphology
- Photos
- Study models
- Diagnostic models
- CBCT
Open space vs close space option for missing upper laterals
Open space
- RBB
- Implant
- RPD
- Conventional bridgework
- Autotransplantation
Close space
- Simple (just close gaps nothing more)
- Space closure plus (close then make teeth look as natural as possible)
Ideal abutment for RBB
Canine
Why is a canine an ideal abutment for RBB?
Root length
Crown dimensions
Less shine through
Advantages of RRB
- Simple
- Can do it when young (complete tx)
- Non destructive
- Aesthetic
- Can place on semi permanent basis (growth doesn’t affect it)
Disadvantages of RRB
- Failure rate
- Can be unaesthetic
- Orthodontic retention needs high
- Technique sensitive
Space required for implant
7mm
Key differences between RRB and Implant (6)
Implant 18+
Minimum of 7mm space needed
Cost
Time
Technically demanding
May need bone graft
