Transcript Chapter 12 Part 2 - University of Nevada, Las Vegas

Chapter 13
Part 2
Mandible and Orbits
Mandible
• Largest ____________ facial bone
• 2 parts
– _________
– _________
• Angle (Gonion)
Mandibular Ramus
• ________________
– ‘U’ shape at top of mandibular ramus
• ________________
– Anterior projection of mandibular notch
• ________________
– Posterior projection of mandibular notch
– Condyle
– Neck
Mandibular Body
• ________________
– Division of Right and Left
• ___________________________
– Anterior projection (Chin)
• ______________
– Center of mental protuberance
• ______________
– Holes for nerves and blood vessels
TMJ
Temporomandibular Joint
• Only __________in the skull
• Mandibular ________ and Temporomandibular
________
• Synovial / Diarthrodial
• Hinge (Ginglymus) and gliding (Plane)
movement
Orbits
• 7 bones
• Rim
– ___________
– Zygoma
– ___________
• Posterior walls
–
–
–
–
Lacrimal
______________
______________
Palatine
Orbit shape
• Cone Shaped
– Apex at _______________
• With OML parallel with the floor
– _____________
– ____________mid sagittal
Orbit openings
• ______________
– Hole in sphenoid for optic nerve
• ________________________
– Cleft between greater and lesser wing of sphenoid
• _________________________
– Cleft between maxilla, zygo, and greater wing of
sphenoid
• _________________
– Separates superior orbital fissure and optic canal (for
optic foramen)
Imaging the Mandible
Routine
•
•
•
•
•
•
•
PA
AP Towne
Axiolaterals
Lateral**
70 – 80 kVp
40” SID
Panorex
PA Mandible
•
•
•
•
•
Prone
_______________on table
____________perpendicular to IR
Have pt close mouth
CR to exit __________________-
• Remember can be done AP
AP Towne
• Supine
• ________________to IR
• Angle CR _________
• Center at level of _______________
Axiolateral
•
•
•
•
•
•
Right and left
Position pt in ____________
____________toward IR
Midsagittal plane to form __________
Center through mid mandibular body
If pt cannot tilt head angle CR
Panorex
• Special film and cassette
• Position head in panorex with ____________to
floor
• No rotation
• Instruct pt _______________
• ____________head in
• Tube will rotate around pt
• Entire Mandible seen _____________
Imaging the TMJ
• Law’s ___________mouth
• Schuller’s ____________mouth
• 70-80 kVp
• 40” SID
Law’s
• Right and Left
• Position in anterior oblique _________to
be imaged
• Place pt in true facial bone _________
• Rotate face ____________table
• Angle CR ___________
• Center through downside TMJ
• Do Closed and Open mouth
Schuller’s
•
•
•
•
•
•
Right and Left
Position into anterior Oblique
Place pt into true facial bone lateral
Angle CR ______________
Center to downside TMJ
Closed and Open mouth
Imaging the Orbits
Routine
•
•
•
•
Waters
Rhese
70 kVp
40” SID
Rhese
• Prone
• Pt’s ____________________on table (3 points)
• Rotate head _______________affected side
– Mid sagittal plane will have a ____________
• __________________to IR
• Center through downside Orbit
• Optic foramen should be in ___________ aspect