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Interceptive orthodontic treatment is important to prevent malocclusion. This treatment is performed to minimize maxillo-facial deformation and malocclusion by removing their causes from primary dentition in an early stage of the mixed dentition period.This case was mandibular protrusion in the growth period with left deviation of the mandibular bone. Although interceptive orthodontic treatment was performed, facial asymmetry became marked with adolescent growth. As a result, surgical orthodontic treatment was performed upon reaching adulthood.The orthognathic surgery consisted of intraoral vertical ramus osteotomy (IVRO) on the deviated side and sagittal splitting ramus osteotomy (SSRO) on the non-deviated side. Although good results were obtained, we evaluated the effects of interceptive orthodontic treatment during the growth period.This case suggests: 1) To prevent mandibular asymmetry, early treatment from the primary dentition period should be regarded as an option; 2) a chin cap should be used in consideration of the possibility of adverse effects; and 3) evaluation of muscle functions is important to facilitate the normal growth and development of the mandible.

nihon gaku henkeishou gakkai zasshi/nihon gaku henkeishō gakkai zasshi

A Case of Skeletal Mandibular Protrusion with Mandibular Asymmetry, in which Surgical Orthodontic Treatment could not be Avoided Although Interceptive Orthodontic Treatment was Performed