Vertical bony step between proximal and distal segments after mandibular setback is related with relapse: A cone-beam computed tomographic study

Myagmarsuren Batbold, Sung Hoon Lim, Seo Rin Jeong, Ji Su Oh, Su Jung Kim, Yoon Ji Kim, Jin Hyoung Cho, Kyung Hwa Kang, Minji Kim, Mihee Hong, Sang Jin Sung, Young Ho Kim, Jae Hyun Park, Seung Hak Baek

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Introduction: Vertical bony step (VBS) occurs between proximal and distal segments of the mandible during mandibular setback surgery with bilateral sagittal split ramus osteotomy. The purpose of this study was to investigate whether VBS is correlated with the relapse of mandibular setback using 3-dimensional models constructed from cone-beam computed tomography. Methods: The subjects consisted of 30 patients who underwent bilateral sagittal split ramus osteotomy for a mandibular setback. Double jaw surgery was performed in 18 patients, and isolated mandibular setback surgery was performed in 12 patients. Cone-beam computed tomography scans were taken at pretreatment (T0), postsurgery (T1), and posttreatment (T2). Treatment changes and the correlations between measurements were evaluated. Results: The mean mandibular setback was −11.9 mm, and the mean VBS was −5.6 mm. Correlations with the relapse of mandibular setback were found in the amount of mandibular setback (T1 − T0), development of VBS (T1 − T0), posterior movement of the proximal segment (T1 − T0), counterclockwise rotation of symphysis (T2 − T1), and the resolution of VBS (T2 − T1). Conclusions: The development and resolution of VBS were correlated with the relapse of mandibular setback. Minimizing VBS is recommended to reduce the relapse of mandibular setback.

Original languageEnglish
Pages (from-to)e524-e533
JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
Volume161
Issue number6
DOIs
StatePublished - Jun 2022

Bibliographical note

Funding Information:
This research was supported by a grant from the Korea Health Technology R&D Project through the Korea Health Industry Development Institute and funded by the Ministry of Health & Welfare, Republic of Korea (grant no. HI18C1638).

Funding Information:
This research was supported by a grant from the Korea Health Technology R&D Project through the Korea Health Industry Development Institute and funded by the Ministry of Health & Welfare , Republic of Korea (grant no. HI18C1638 ).

Publisher Copyright:
© 2022 American Association of Orthodontists

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