mandible, sinuses, temporal bone wynn harrison, med
Post on 19-Dec-2015
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MANDIBLE, SINUSES, TEMPORAL BONE
Wynn Harrison, MEd
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NEW WORDS
• Sinusitis: Inflammation of the sinuses
• Mucocele: Enlargement of the lacrimal sac. Cystic disease of the air cavities – causes erosion of the bone
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• Retention Cyst: A cyst retaining the secretion of a gland, ie: mucosal or sebaceous cyst
Mastoiditis: Inflammation of the mastoid sinus
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• Otitis: Inflammation of the ear: ie: otitis media; can be internal or external
• Acoustic Neuroma: benign tumor of the eighth cranial nerve. Symptoms = hearing loss, pain, headache, balance problems.
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Mandible
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AP Axial (Townes)
• OML = 30 degrees• IOML = 37
degrees
• Center mid-ramus
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PA Mandible
• OML perpendicular to IR
• Center mid-mandible
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Axiolateral Mandible
• Head tilt 15 degrees
• CR 15 degrees cephalic
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SMV Mandible
• IOML parallel to IR and perpendicular to CR.
• Image mentum skimming frontal bone
• Merrill’s p. 389-390
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Temporomandibular joints
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Cone-Down of TMJ
• Relaxed Lateral with 15 degree caudal angulation
Merrill’s p. 396
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Schullers Projection
• The Schullers Projection can be used to evaluate the temporal mandibular joints and mastoid air cells and inner ear.
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Schullers Protection for TMJ• Open and closed
mouth view are taken of both TM joints.
• The TMJ closest to the Bucky will be the one seen at the center or top of the film.
• Accurate positioning is essential to being able to compare joints.
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TMJ Syndrome
• Clicking, pain in TMJ• May indicate dysfunction of the
TMJ• Caused by inflammation, stress,
muscle spasm, etc.
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Paranasal Sinuses
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Lateral Sinus
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Sinuses: Caldwell
Frontal
Ethmoid
Maxillary
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Water’s view (sinuses)
Maxillary Sinus
Petrous Pyramids
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What sinuses can you see?
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Waters Projection
• Waters projection demonstrates:• Cloudy maxillary
sinuses worse on left.
• Sinus infection that needed antibiotics.
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SMV - Sinuses
• Demonstrates sphenoid sinus
• Merrill’s p. 418
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Temporal Mandibular Bone
• Law Method• Shuller Method• Stenver’s Method• Arcelin Method• Mayer Method• Hickey Method
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• These projections will not be on your boards … but review Merrill’s p 430-452
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PATHOLOGY
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Fracture to Mandible and Zygomatic Arches
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Mandibular Ramus Fracture
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Bilateral Fractures of the Mandible
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Film critique
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Critical thinking