zygomatic arches, mandibles, tmjs Flashcards
what are the zygomatic arches projections
SMV
tangential
modified towne
what are the mandible projections
lateral
PA/AP
PA/AP axial
axiolateral oblique
what are the projections for TM joints
modified towne
axiolateral (open and closed)
how is alignment for zygo SMV
IOML parallel to IR
1” posterior to outer canthus of the eye
how to align the zygo tangential
like SMV, nose 15 towards focus side, tilt chin 15 towards focus
how to line up a zygo modified towne
30 deg caudad
CR through middle of arches
how are zygos usually fractured
contrecoup
fractured in 2 places
what needs to be included on a lateral mandible
TMJ!!
symphysis menti, anterior occlusals
what CR is used for an axiolateral mandible
25 deg cephalad
what is the head angle for a axiolateral mandible ramus
head in true lateral
what is the head angle for a axiolateral mandible body
head 30 deg towards IR
what is the head angle for a axiolateral mandible symphysis
head 45 deg towards IR
what is the head angle for a axiolateral mandible general survey
head 15-20 towards IR
what are the 2 ways to do a mandible axiolateral oblique
- erect (semi-prone)
- semi-supine on table
what is the erect method for mandible
CR 10 cephalad
tilt vertex 15 towards IR
where should light reach on an AP/PA mandible
light above EAM, light below symphysis menti
what CR is used for a mandible modified towne
35 deg caudad
where is CP for mandible modified towne
midway between EAM and symphysis menti
what angle is used for a mandible PA axial
20-25 cephalad
what is the CR for a tmjj modified towne
35 caudad
what is the CR used for TMJ axiolateral
25-30 deg caudad
where is the CP for the TMJ axiolateral
2” superior to EAM
