Chapter 11Part 4

Mandible and Orbits

Mandible

• Largest _________ facial bone

• 2 parts– ______– ______

• Angle (Gonion)

Mandibular Ramus

• ____________ – ‘U’ shape at top of mandibular ramus

• __________ Process – Anterior projection of mandibular notch

• __________ Process – Posterior projection of mandibular notch– Condyle– Neck

Mandibular Body

• ____________ – Division of Right and Left

• _________ (Mental Protuberance) – Anterior projection (Chin)

• Mental ________– Center of mental protuberance

• Mental ________– Holes for nerves and blood vessels

TMJTemporomandibular Joint

• Only ___________in the skull

• Mandibular condyle and Temporomandibular fossa

• Synovial / Diarthrodial

• Hinge (_________) and gliding (_______) movement

Orbits

• 7 bones • Rim

– _________– Zygoma– _________

• Posterior walls – Lacrimal– ___________– ___________– Palatine

Orbit shape

• Cone Shaped– Apex at ____________

• With ____________with the floor – _____ superior– _____ toward mid sagittal

Orbit openings

• Optic ____________– Hole in sphenoid for optic nerve

• Superior ____________– Cleft between greater and lesser wing of sphenoid

• Inferior ____________– 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 kV• 40” SID• Panorex**

PA Mandible

• Prone• Forehead and nose on table• ______________to IR• Have pt close mouth• CR to _______________of lips

• Remember can be done __________

AP Towne

• Supine

• ________________to IR

• Angle CR ______________

• Center at level of ______________

Axiolateral

• Right and left• Position pt in ___________• Tilt head __________• Midsagittal plane to form ___________• Center through mid mandibular body• If pt cannot tilt head ____________

Panorex

• Position head in panorex with ___________to floor

• No rotation• Instruct pt to remain still.• _____________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 ______________downside

TMJ to be imaged• Place pt in true facial bone ________• Rotate face _________table• Angle CR ___________• Center through downside TMJ• Do ____________mouth

Schuller’s

• Right and Left• Position into ____________• Place pt into true facial bone lateral• Angle CR ___________• Center to downside TMJ• ____________mouth

Imaging the Orbits

Routine• Waters• Rhese• 70 kV• 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 lower lateral aspect