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

 Pi En Chang  ;  Jun-Young Kim  ;  Hwi-Dong Jung  ;  Jung Jin Park  ;  Yoon Jeong Choi 
 CLINICAL ORAL INVESTIGATIONS, Vol.26(11) : 6607-6616, 2022-11 
Journal Title
Issue Date
Cephalometry ; Humans ; Malocclusion, Angle Class II* ; Maxilla / surgery ; Molar / surgery ; Open Bite* / surgery ; Orthodontic Anchorage Procedures* ; Orthognathic Surgical Procedures* ; Overbite* ; Retrospective Studies ; Tooth Movement Techniques
Mini screw ; Molar intrusion ; Open bite ; Orthognathic surgery ; Posttreatment stability
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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2. College of Dentistry (치과대학) > Dept. of Oral and Maxillofacial Surgery (구강악안면외과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Jun-Young(김준영) ORCID logo https://orcid.org/0000-0002-6596-6135
Jung, Hwi Dong(정휘동) ORCID logo https://orcid.org/0000-0003-1025-8323
Choi, Yoon Jeong(최윤정) ORCID logo https://orcid.org/0000-0003-0781-8836
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