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