Orthodontic Assessment Flashcards
what are the 6 main keys when looking at the ‘ideal occlusion’?
- molar relationship
- crown angulation
- crown inclination
- no rotations
- no spaces
- flat occlusal planes
what is a malocclusion?
significant deviation from the ideal occlusion (whether functionally or aesthetically)
why can patient habits be relevant in orthodontics?
things like:
- thumb sucking
- lower lip sucking
- tongue thrust
- chewing fingernails
all apply forces which can interfere with a patients predetermined occlusion
what is the frankfort plane?
passes through inferior margin of orbit to just along the superior margin of the external auditory meatus
what is the frankfort-mandibular plane angle, and its significance?
the angle made between the frankfort plane and the body of the mandible
can be used to detect changes in the mandibles positioning
what is the ideal positioning of the lips in an orthodontic patient?
lips meet at rest when relaxed
lips that DONT MEET AT REST, are deemed as incompetent. This can lead to PROCLINED upper incisors
what is a cause of anterior open bite (AOB)?
tongue thrust can result in AOB
what are occlusal features when a patients sucking fingers?
- proclination of upper anteriors
- retroclination of lower anteriors
- localised AOB
- unilateral posterior crossbite
in an intra-oral exam for ortho, what is needed to be checked?
- OHI & perio health
- count teeth (from back to front)
- assess crowding/spacing/rotations/inclinations/angulation
- palpate for canines [IF NOT ERUPTED]
- note teeth of abnormal shape/size
what is the canine relationship in a class 1, 2, and 3 occlusion?
Class 1 - lower canine (distal incisal edge) makes contact with upper canine (mesial incisal edge)
Class 2 - lower and upper canine have the same alignment, overlapping
Class 3 - Lower canine is in front of upper canine
what is a crossbite?
a type of malocclusion where the top and bottom teeth dont align properly when in ICP (the centre lines are squint)
