Flashcards on Pierre Robin Sequence: Clinical Management
Pierre Robin Sequence: Clinical Management & Student Guide
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Mandibular distraction osteogenesis
49 cards
Card 1
Question: What is the recommended consolidation period after mandibular distraction osteogenesis in the described protocol?
Answer: About 8 weeks.
Card 2
Question: How are distraction pins cared for postoperatively?
Answer: Pins are cleaned with peroxide and antibiotic ointment is applied twice daily.
Card 3
Question: Why is vector positioning critical when using internal distraction devices?
Answer: Because the distraction vector is fixed once the device is fixed, determining the final outcome; intraoral device positioning therefore dictates final
Card 4
Question: What are advantages of internal distraction devices over external devices?
Answer: One-to-one bone lengthening with activation, less prone to dislodgement from trauma, and no stretched skin scars from external pins.
Card 5
Question: What are disadvantages of internal distraction devices?
Answer: Require wider exposure for placement, have a fixed distraction vector (no multidirectional adjustment), and require a second operation for device remo
Card 6
Question: Why are resorbable fixation units for internal devices desirable?
Answer: They would eliminate the need for a second operation because the device could be removed from resorbable fixation after consolidation.
Card 7
Question: What is the recommended osteotomy site for neonatal mandibular distraction and why?
Answer: Osteotomy in the ramus above the occlusal plane to minimize risk to the inferior alveolar nerve and avoid creating gaps in the permanent dentition.
Card 8
Question: Why do the authors prefer lengthening the ramus rather than the body of the mandible in infants?
Answer: Infants with PRS have a short ramus; lengthening the ramus avoids damaging tooth roots and prevents gaps in the permanent dentition associated with bo
Card 9
Question: What rough vector guide is suggested when lengthening the ramus to advance the chin?
Answer: Remain parallel to the posterior border of the ramus, producing a vector about 60° from the occlusal plane to lengthen the ramus and advance the chin.
Card 10
Question: How does autorotation of the mandible affect chin advancement after ramus lengthening?
Answer: Autorotation secondary to ramus lengthening also brings the chin point forward.