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Chapter 11 Part 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 TMJ Temporomandibular 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
