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Posttreatment stability of an anterior open-bite by molar intrusion compared with 2-jaw surgery — a retrospective study

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Abstract

Objectives

This study aimed to compare post-treatment stability in patients with anterior open-bite (AOB) between those treated surgically (orthognathic 2-jaw surgery) and non-surgically (molar intrusion using orthodontic miniscrews).

Materials and Methods

All subjects had initial overbite (OB) < -1 mm and lateral cephalograms taken before treatment (T0), immediately after AOB correction (T1), after orthodontic treatment (T2), and at least 1 year after treatment (T3). The non-surgical group was enrolled retrospectively; then, the surgical group was matched by OB, sex, and age to the non-surgical group (n = 21 each). Changes in cephalometric measurements during treatment (T1-T0), finishing (T2-T1), and retention (T3-T2) periods were compared between two groups.

Results

OB increased by 4.5–5.1 mm during the treatment period with 3.3 mm upward movement of the maxillary first molar (U6) in both groups. Changes in OB were not significantly different between the groups: 0.5–0.9 mm increase during the finishing period but 1.0 mm decrease during the retention period (P > 0.05). U6 moved 0.5 mm downward in non-surgical group and 0.1 mm upward in the surgical group during the finishing period, and 1.0 mm and 0.4 mm downward in the non-surgical and surgical groups, respectively, during the retention period.

Conclusions

Post-treatment stability of AOB was similar for surgical and non-surgical methods (76.8 – 78.7%), although U6 moved more downward in the non-surgical group than in the surgical group.

Clinical Relevance

AOB without severe skeletal deformity can be treated by either molar intrusion or orthognathic surgery with similar treatment outcome and stability.

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Funding

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2020R1F1A1069316).

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Authors and Affiliations

  1. Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea

    Pi En Chang, Jung Jin Park & Yoon Jeong Choi

  2. Department of Oral and Maxillofacial Surgery, Yonsei University College of Dentistry, Seoul, Republic of Korea

    Jun-Young Kim & Hwi-Dong Jung

  3. Department of Orthodontics, Dental Hospital, Kyung Hee University Hospital at Gangdong, Seoul, South Korea

    Jung Jin Park

Authors
  1. Pi En Chang
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  2. Jun-Young Kim
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Contributions

Pi En Chang contributed to data collection, analysis, drafted the original manuscript and critically revised the manuscript. Jun-Young Kim, Hwi-Dong Jung, and Jung Jin Park contributed to critically revised the manuscript. Yoon Jeong Choi contributed to conception, data collection, and critically revised the manuscript.

Corresponding author

Correspondence to Yoon Jeong Choi.

Ethics declarations

Ethics approval and consent to participate

The subjects in this retrospective study were selected from the archives of the Department of Orthodontics, Yonsei University Dental Hospital after IRB approval (No. 2–2016-0017). Written informed consent was waived because of the retrospective design of this study.

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All authors have seen and approved the manuscript. This manuscript has not been published or presented elsewhere in part or in entirety and is not under consideration by another journal.

Conflict of interest

The authors declare no competing interests.

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Chang, P.E., Kim, JY., Jung, HD. et al. Posttreatment stability of an anterior open-bite by molar intrusion compared with 2-jaw surgery — a retrospective study. Clin Oral Invest 26, 6607–6616 (2022). https://doi.org/10.1007/s00784-022-04615-6

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  • DOI: https://doi.org/10.1007/s00784-022-04615-6

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