sLong-term stability of pre-orthodontic bimaxillary surgery using intraoral vertical ramus osteotomy versus conventional surgery

Publication date: Available online 20 February 2018
Source:Journal of Oral and Maxillofacial Surgery
Author(s): Jeong-Hwa Jeong, Sung-Hwan Choi, Kee-Deog Kim, Chung-Ju Hwang, Sang-Hwy Lee, Hyung-Seog Yu
PurposeThe aim of the present study was to compare the long-term stability of bimaxillary surgery using an intraoral vertical ramus osteotomy (IVRO) with and without pre-surgical orthodontic treatment.MethodsThe present retrospective study included 31 consecutive patients with skeletal Class III malocclusions who had undergone bimaxillary surgery (Le Fort I osteotomy and bilateral IVRO). Patients were divided into two groups based on treatment type: pre-orthodontic orthognathic surgery (POGS, n=17) and conventional surgery (CS, n=14) with pre-surgical orthodontic treatment. Lateral cephalograms were obtained before surgery, 1 day after surgery, 1 month after surgery, 1 year after surgery, and 2 years after surgery to evaluate skeletal and soft tissue changes between the two groups. The data were analyzed using chi-square tests, Mann-Whitney U tests, repeated-measures analyses of variance and independent t-tests.ResultsThere was no significant difference in skeletal or soft tissue measurements—with the exception of the angle between the sella-naison plane and the occlusal plane (SN-OP) (P < 0.001)— between the CS and POGS groups at 2 years after IVRO. The SN-OP had increased in the CS group but decreased in the POGS group at 2 years after surgery.ConclusionsOur findings suggest that POGS and CS are associated with similar long-term stability in patients with skeletal Class III malocclusion.



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