aetiology malocclusion - local causes Flashcards
dental causes of malocclusion
1) tooth/tissue ratio
2) number of teeth
3) abnormal form or position of teeth
4) path of closure
5) pathology
causes of malocclusion in general terms
- soft tissues
- skeletal pattern
- local causes
aetiology of crowding
genetic (independent genetic control of teeth and jaws)
environmental
anodontia
no teeth
hypodontia
missing teeth
what is severe hypodontia common in
ectodermal dysplasia (group of genetic disoders)
types of supernumerary teeth
conical
tuberculate
supplemental
conical
supernumerary tooth
tends to erupt usually between central incisors
displaces other teeth
tuberculate teeth
tend not to erupt
barrel shape
prevents eruption of other teeth
more than 1 cusp
supplemental teeth
resemble normale tooth
occurs at ends of series
interference with normal timing
premature loss of teeth
retention of primary teeth
delayed eruption of permanent teeth
retention of primary teeth can lead to
deflection of permanent teeth (upper laterals deflected palatally)
infra occluded teeth
submerging
may be due to missing permanent tooth or analysed primary tooth
abnormal forms of teeth
macrodontia
microdontia
macrodontic teeth
appearance they are fused together
large pulp chambers
