Cephaometric superimposition tech Flashcards
what is cephalomtrix superimposition
overlaying a ceph tracing from one time to another ceph at a different time
why do ceph superimposition
Evalute changes in jaw/tooth relationships in the same individual between diff points in time
- see if growth
- dental maturation
- ortho tooth movement
- changes from orthognathic surgery evaluated this way
what 3 resgions are superimposed in ceph tracing
Cranial base
Maxilla
Mandible
what does a cranial base superimposition show
changes in jaw and face relative to cranial base
- show changes in facial hard and soft tissue relative to a stable reference area (Cranial base)
what does a maxillar superimposition show
Skeletal changes removed
dental changes relative to maxilla are shown
what is harder, maxillary or mandibular superimposition
Mandibular is harder
how long doo growth and treatment changes take
Growth: years
TReatment: months
where do you do a cranial base superimpose tracings
Sella
Then Sella-Nasion lines
why do a maxilary superimposotion
Visualize maxillary incisors and molar changes between two tracings
what is superimposed on a maxillary superimposition
the lingual contour of the palate behind the upper incisors then rotate so palatal plane is level
what does a manxibular super imposotion allow you to see
see how the mandibular incors and molars changed position/angulation between two tracings
how to do a mandibular superimposition
along the inner aspect of mandibular symphysis
unerupted 3rd molar crypt
inferior alveolar nerve canal
wht superimpose certain things in an impage
Dont’ change during growth
what does the cranial base superimposotion show
Skeletal and soft tissue profile changes relative to a stable cranial base
what does a maxilary superimposotion show
change of maxillary dentition relative to the palate
