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
What needs to be assessed before planning space closure approach for missing laterals?
Gingival margins of central and canine
Space closure plus advantages
No prosthesis - low maintenance
Good aesthetics with appropriate orthodontic and restorative techniques
Can be done at an early age
