Poster 204: Sensory Disturbance of the Lower Lip After 100 Cases of Sagittal Splitting Ramus Osteotomy–The Relationship Between Mandibular Canal and Osteotomy Line

Abstract

Statement of the ProblemSagittal splitting ramus osteotomy (SSRO) has much indication as one of the basic operations for maxillofacial deformities. However, postoperative sensory disturbance of lower lip can be often seen, and the cause is thought about in various ways. We studied the relations between development of postoperative sensory disturbances and anatomical positions of mandibular canals.Materials and MethodsWe examined it about 100 patients (200 sides: Male 32 cases, Female 68 cases) who operated in SSRO at Second Department of Oral and Maxillofacial Surgery of Osaka Dental University Hospital in from 2004 to 2006.Method of Data AnalysisWe examined preoperative standardized CT images that fixed horizontal plane and occulusal plane vertically. We measured distance from the medial border of the lateral cortex of the mandibular ramus at the slice under 5 mm of the mandibular lingula to the mandibular canal.ResultsWe founded the postoperative sensory disturbances of lower lip in 138 sides among 200 sides. The disturbances were recognized most in a range from 1.0 mm to 2.0 mm. Those disturbances decreased with time and only remained 23 sides after six months postoperative. At the time, the disturbances were recognized most in a range from 1.0 mm to 2.0 mm.ConclusionIt was suggested that there are correlation in the relations between postoperative sensory disturbances of lower lip and anatomical positions of mandibular canals. Statement of the ProblemSagittal splitting ramus osteotomy (SSRO) has much indication as one of the basic operations for maxillofacial deformities. However, postoperative sensory disturbance of lower lip can be often seen, and the cause is thought about in various ways. We studied the relations between development of postoperative sensory disturbances and anatomical positions of mandibular canals. Sagittal splitting ramus osteotomy (SSRO) has much indication as one of the basic operations for maxillofacial deformities. However, postoperative sensory disturbance of lower lip can be often seen, and the cause is thought about in various ways. We studied the relations between development of postoperative sensory disturbances and anatomical positions of mandibular canals. Materials and MethodsWe examined it about 100 patients (200 sides: Male 32 cases, Female 68 cases) who operated in SSRO at Second Department of Oral and Maxillofacial Surgery of Osaka Dental University Hospital in from 2004 to 2006. We examined it about 100 patients (200 sides: Male 32 cases, Female 68 cases) who operated in SSRO at Second Department of Oral and Maxillofacial Surgery of Osaka Dental University Hospital in from 2004 to 2006. Method of Data AnalysisWe examined preoperative standardized CT images that fixed horizontal plane and occulusal plane vertically. We measured distance from the medial border of the lateral cortex of the mandibular ramus at the slice under 5 mm of the mandibular lingula to the mandibular canal. We examined preoperative standardized CT images that fixed horizontal plane and occulusal plane vertically. We measured distance from the medial border of the lateral cortex of the mandibular ramus at the slice under 5 mm of the mandibular lingula to the mandibular canal. ResultsWe founded the postoperative sensory disturbances of lower lip in 138 sides among 200 sides. The disturbances were recognized most in a range from 1.0 mm to 2.0 mm. Those disturbances decreased with time and only remained 23 sides after six months postoperative. At the time, the disturbances were recognized most in a range from 1.0 mm to 2.0 mm. We founded the postoperative sensory disturbances of lower lip in 138 sides among 200 sides. The disturbances were recognized most in a range from 1.0 mm to 2.0 mm. Those disturbances decreased with time and only remained 23 sides after six months postoperative. At the time, the disturbances were recognized most in a range from 1.0 mm to 2.0 mm. ConclusionIt was suggested that there are correlation in the relations between postoperative sensory disturbances of lower lip and anatomical positions of mandibular canals. It was suggested that there are correlation in the relations between postoperative sensory disturbances of lower lip and anatomical positions of mandibular canals.