Basic Sciences Applied to OMFS
Basic Sciences Applied to OMFS
This domain tests anatomy, physiology, microbiology, and healing as applied to surgical decisions. The exam links basic facts to operative risk, especially nerve, vascular, and fascial anatomy.
Core rules
- The inferior alveolar nerve enters the mandibular canal near the lingula; the mental nerve exits at the mental foramen.
- The lingual nerve lies close to the lingual plate in the third molar region and is at risk during lingual retraction.
- The facial artery crosses the mandibular border near the antegonial notch; know its course before incision.
- Fascial spaces determine infection spread; the pterygomandibular and lateral pharyngeal spaces connect to deeper neck spaces.
- Wound healing proceeds through hemostasis, inflammation, proliferation, and remodeling; infection, ischemia, and diabetes impair it.
Worked example
During a mandibular third molar extraction, a lingual flap is retracted vigorously. Reasoning: the lingual nerve can be stretched or injured near the lingual crest. Use careful subperiosteal technique and avoid prolonged compression; document sensation before and after surgery.
Traps
Ignoring the lingual plate; misjudging the mental foramen; underestimating fascial spread; failing to consider coagulation and healing capacity; confusing anatomic landmarks on panoramic imaging.