Evaluation of a modified subapical anterior segmental maxillary osteotomy versus the downfracture technique in the treatment of maxillary protrusion / Mohamed Ihab Elsayed Mosleh ; Supervised Ragia Mohamed Mounir , Ibrahim Abdalla , Hassan Abdelghany

Thesis (Ph.D.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Oral and Maxillofacial Surgery

Orthognathic surgery is one of the highly specialized part of oral and maxillofacial surgery. It gives right opportunity to every individual to live with well proportional and contoured profile. Aim of study: This study investigate the soft changes following anterior segmental osteotomy on the maxilla in twelve adult patients with ages ranging from 22 to 35 years suffering from dental maxillary protrusion that requires surgical correction by anterior maxillary osteotomy. Results: (1) hard tissue changes were only observed in the maxillary region. Soft tissue mean change included 69.7% backward displacement of the Labrale superius in relation to bone displacement in group I and 64.7% in group II. The mean increase in the naso-labial angle was 9.97 in group I and 14.69 in group II. The nasal tip inclination showed a mean increase by 3.51{u00B0} on the FH line in group I,and 0.61{u00B0} in group II revealing no statistically or clinically significant change in both groups though group II showed lesser mean % change in nasal tip inclination. (2) The highest correlation coefficient was obtained between the hard and soft tissue changes in the upper lip region. (3) The horizontal and vertical soft tissue change in the upper lip region was predicted using lateral cephalogram analysis and frontal photogrammetry.

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