Occlusion and Malocclusion Flashcards
what is an ideal/normal occlusion?
anatomically perfect arrangement of the teeth
what is malocclusion?
an irregularity in the occlusion beyond the accepted range of normal
do all malocclusions require treatment?
no
what is classed as normal occlusion?
all teeth well aligned
no crowding
class I incisor relationship
Class I molar relationship
normal overjet
normal overbite
what are the causes of malocclusion?
genetic
- skeletal pattern
- size of jaws and teeth
- syndromes e.g. cleft
environmental
- soft tissues e.g incompetent lips
- habits
- pathology e.g. tumour
- trauma
local
- hypodontia
supernumerary
fraenum
retained deciduous tooth
early loss of deciduous tooth
what are the size of jaws and teeth when crowding is experienced?
big teeth
small jaws
what are the size of jaws and teeth when spacing is experienced?
small teeth
big jaws
what is class I malocclusion?
normal overjet and overbite but may have squint teeth
what is class II malocclusion?
overbite, may be squint
what is class III malocclusion?
upper teeth are behind lower teeth, may be squint
what does thumb sucking cause?
acts as a brace, pushes the teeth out of alignment causing an anterior overbite. pushes top teeth in as cheeks put pressure on them
what does the IOTN stand for?
Index of orthodontic treatment need
what is the purpose of the IOTN?
measurement of severity of malocclusion
what are the 2 components of the IOTN?
dental health component
aesthetic component
what is the purpose of the dental health component?
looks at the impact it has on the patient’s mouth and dental health
graded 1-5
