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Comparison of the skeletal stability after mandibular counter-clockwise rotation in three surgical procedures

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Abstract

The treatment of mandibular deformities with an anterior open bite is challenging. In this study, skeletal stability after mandibular osteotomies was evaluated to determine the best treatment for mandibular prognathism with an anterior open bite in three procedures: intraoral vertical ramus osteotomy (IVRO), conventional sagittal split ramus osteotomy (conv-SSRO), and SSRO without bone fixation (nonfix-SSRO). Patients who underwent mandibular osteotomy to correct skeletal mandibular protrusion were included. Changes in skeletal and soft tissues were assessed using lateral cephalograms taken before (T1), 3 ± 2 days (T2), and 12 ± 3 months (T3) after surgery. Thirty-nine patients were included: nine in the IVRO group and 11 and 19 in the conv- and nonfix-SSRO groups, respectively. The mandibular plane angles (MPAs) of the T2–T1 were − 2.7 ± 2.0 (p = 0.0040), − 3.7 ± 1.7 (p < 0.0001), and − 2.3 ± 0.7 (p < 0.0001) in the IVRO, conv-SSRO, and nonfix-SSRO groups, respectively. The skeletal relapse of the MPAs was not related to the MPA at T2–T1, and it was approximately 1.3° in the conv-SSRO group. The skeletal relapse of the MAPs was significantly correlated with the MPA of T2–T1 in the IVRO (p = 0.0402) and non-fix-SSRO (p = 0.0173) groups. When the relapse of the MPAs was less than 1.3°, the MPA of T2–T1 was calculated as 2.5° in the nonfix-SSRO group. When the MPA of T2–T1 is less than 2.5°, non-fix SSRO may produce a reliable outcome, and when it is more than 2.5°, conv-SSRO may produce better outcomes.

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Acknowledgements

We thank Drs. Masahito Hara and Sousuke Ichinose for collecting the patient data in this study.

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Authors and Affiliations

  1. Department of Regenerative Oral Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan

    Shun Narahara, Rena Shido & Seigo Ohba

  2. Department of Orthodontics and Dentofacial Orthopedics, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan

    Yukiko Morita & Noriaki Yoshida

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  1. Shun Narahara
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  2. Yukiko Morita
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  3. Rena Shido
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  4. Noriaki Yoshida
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Correspondence to Seigo Ohba.

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Narahara, S., Morita, Y., Shido, R. et al. Comparison of the skeletal stability after mandibular counter-clockwise rotation in three surgical procedures. Odontology 112, 640–646 (2024). https://doi.org/10.1007/s10266-023-00860-7

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  • DOI: https://doi.org/10.1007/s10266-023-00860-7

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