Intraosseous anatomical relations in ramus and mandibular body in modified sagittal mandibular osteotomy technique
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BACKGROUND: Different modifications to the mandibular sagittal osteotomy (MSO) have been proposed to diminish complications, which still occur due to the limited knowledge about the anatomical structures. PURPOSE: To observe the intraosseous anatomical relationships in both, ramus and mandibular body, by using the MSO. METHODS: 26 modified MSOs were done in 13 dry human mandibles. Mandible specimens were previously mapped in points A, B, C. The lingula mandibulae was localized in vertical sense drawing a line from B to C regarding a perpendicular line coming from point A, and in horizontal sense regarding the lines coming from points A and B. Superior and inferior borders of the mandibular canal were also localized regarding either the superior or inferior border of the mandibular body distally to the second molar. RESULTS: Distance measured vertically, between the junction of the external and internal oblique lines to the initial osteotomy site was 8.1 mm (9.3 mm upper, 6.4 mm lower). Distance between the superior border of the mandibular body to the superior border of the mandibular canal distally to the second molar was 7.8 mm (8.7 mm upper, 6.9 mm lower). CONCLUSIONS: By using the modified MSO, it is unnecessary to visualize the soft tissue flap to expose until displaying the neurovascular bundle to perform the initial horizontal osteotomy in the mandibular ramus. The measure of 7.8 mm from the superior border of the mandibular body to the superior border of the mandibular canal distally to the second molar is taken as anatomical guideline.
Cirugía ortognática, osteotomía sagital mandibular, rama mandibular, cuerpo mandibularOrthognatic surgery, mandibular sagital osteotomy, mandibular body, mandibular raw
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