Management and Clinical Study of Intraoral Inverted L Ramus Osteotomy in Rakuwakai Otowa Hospital

要旨

Sagittal split ramus osteotomy （SSRO） is mainly performed for patients with mandibular deformity as orthognathic surgery, and is a versatile intraoral procedure to address various deformities of the mandible. One of the severe potential complications of SSRO is inferior alveolar nerve disturbance. The cause is the mandibular canal pattern and/or thin ramus, and there are many cases of neurosensory disturbance after SSRO. We have used intraoral inverted L ramus osteotomy （ILRO） to treat cases that were not amenable to SSRO and achieved good treatment outcomes. At our department from 2006 to 2018, we intraorally treated 65 cases, 101 sides of ILRO and 52 cases with plate fixation procedures. We performed a retrospective clinical study of the cases treated by ILRO at our department, and found that a few cases of inferior alveolar nerve sensory disturbance by ILRO were completely resolved by 3 months after surgery. Therefore, the ILRO procedure is considered to be useful as a third method of mandibular osteotomy, following SSRO or intraoral vertical ramus osteotomy （IVRO）.

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