5 Written questions
5 Matching questions
- Describe the direction of force on the mandible for each muscle:
2. Lateral pterygoid
3. Medial pterygoid
- Describe Champy lines of osteosynthesis.
- What are the boundaries of the zones of the neck for penetrating trauma
- What forms the border between the symphisis and body of the mandible?
- Treatement of posterior table frontal sinus fractures.
1. Temporalis pulls coronoid posterosuperiorly.
2. Lateral pterygoid pulls condyle anteroinferiorly.
3 & 4. Masseter & medial pterygoid pull the angle anterosuperiorly.
5 & 6. Geniohyoid and digastric pull mentum inferoposteriorly.
- b An imaginary line drawn at the canines
"ideal lines of osteosynthesis" across the mandibular angle where the compressive and tensile forces from mastication can be countered with only monocortical fixation
- d If no displacement or e/o CFS leak, observe and give abx. If displaced, obliteration and possible repair of dural tear. Cranialization reserved for fracture with significant bone loss or comminution.
Zone 1: thoracic inlet inferiorly and the cricoid cartilage superiorly
Zone 2: inferior border of cricoid cartilage to the angle of the mandible
Zone 3: angle of the mandible to the base of the skull
5 Multiple choice questions
- within 3 hours of injury or from 3-7 days.
Some say panorex for subcondylar. Otherwise, Towne's view.
- external carotid-->internal maxillary-->inferior alveolar
- Usually involve the body and sympysis-parasymphysis areas.
The fracture line is posterior on the lateral cortex and anterior on the medial cortex. Therefore, the portion of the mandible posterior to the fracture is pulled medially, displacing the fracture. The mylohyoid is the primary muscle displacing the fracture.
- contralateral angle
5 True/False questions
how do you treat frostbite of the ear? →
Class II: retrognathism
Class III: prognathism
Long-term complications of orbital blow out → enophthalmos, dipoloplia, infraorbital nerve hypesthesia
What is shown in a submental vertex view film? →
which way does the lateral pterygoid tend to displace the condylar head → rapid rewarming in circulating water. avoid rubbing and dry heat as both of these predispose to liquefactive necrosis. surgical debridement not indicated for 3 weeks for final demarcation of injury
Absolute and relative indications for open reduction of subcondylar fx → Absolute
1. Dislocation into middle cranial fossa
2. Lateral extracapsular displacement
3. Inability to obtain adequate occlusion with closed reduction
4. Open joint with foreign body
1. Bilateral subcondylar fx's in edentulous patient (splinting impossible)
2. When splinting not recommended for medical reasons
3. Bilateral fractures associated with comminuted midfacial fractures