<abstract xmlns="http://www.w3.org/1999/xhtml">

A retrospective cephalometric study was performed to investigate the stability of 37 non-growing anterior open-bite cases using mini-plate rigid fixation. The sample was divided into two groups: Group A: maxillary repositioning alone (17 cases) and Group B: bimaxillary surgery (20 cases). Tracings were performed pre-operatively (T1), immediately post-operatively (T2) and at a minimum of one year follow-up (T3) (12–90 months).
In Group A, the maxilla was advanced (3.8 +_ 2.8 mm, p &lt; 0.01) and superiorly repositioned at PNS (2.8 +_2.3 mm, p &lt; 0.001). In Group B, the maxilla was advanced (3.5 +_ 3.0 mm, p &lt; 0.01) and superiorly repositioned at PNS (3.7 +_ 1.8 mm, p &lt;0.001); and the mandible (11.7 +_ 3.8 mm, p &lt; 0.001), with no significant change in the vertical plane (p > 0.05).
Late relapse due to condylar remodelling or resorption was found as a cause of large horizontal relapse (8.0 &lt; x &lt; 14.0 mm) in three cases (15%), the amount being associated with the amount of operative advancement (r = 0.7, r-sq = 40%, p &lt; 0.01).
It was concluded that the correction of anterior open bite by posterior repositioning of the maxilla using rigid fixation is a stable procedure during the follow-up period, and that in bimaxillary cases, post-operative stability depends largely on the stability of the mandibular advancement, which in turn relates to the amounts of advancement, the pre-operative anterior open bite and the mandibular plane angle.
</abstract>

A retrospective cephalometric study was performed to investigate the stability of 37 non-growing anterior open-bite cases using mini-plate rigid fixation. The sample was divided into two groups: Group A: maxillary repositioning alone (17 cases) and Group B: bimaxillary surgery (20 cases). Tracings were performed pre-operatively (T1), immediately post-operatively (T2) and at a minimum of one year follow-up (T3) (12–90 months).
In Group A, the maxilla was advanced (3.8 +_ 2.8 mm, p < 0.01) and superiorly repositioned at PNS (2.8 +_2.3 mm, p < 0.001). In Group B, the maxilla was advanced (3.5 +_ 3.0 mm, p < 0.01) and superiorly repositioned at PNS (3.7 +_ 1.8 mm, p <0.001); and the mandible (11.7 +_ 3.8 mm, p < 0.001), with no significant change in the vertical plane (p > 0.05).
Late relapse due to condylar remodelling or resorption was found as a cause of large horizontal relapse (8.0 < x < 14.0 mm) in three cases (15%), the amount being associated with the amount of operative advancement (r = 0.7, r-sq = 40%, p < 0.01).
It was concluded that the correction of anterior open bite by posterior repositioning of the maxilla using rigid fixation is a stable procedure during the follow-up period, and that in bimaxillary cases, post-operative stability depends largely on the stability of the mandibular advancement, which in turn relates to the amounts of advancement, the pre-operative anterior open bite and the mandibular plane angle.

Anterior open-bite malocclusion: stability of maxillary repositioning using rigid internal fixation

Lecturer, Dept Oral and Maxillofacial Surgery Prince of Songkla University Hospital

Australasian Orthodontic Journal

This work is licensed under the Creative Commons Attribution 4.0 International License.

A retrospective cephalometric study was performed to investigate the stability of 37 non-growing anterior open-bite cases using mini-plate rigid fixation. The sample was divided into two groups: Group A: maxillary repositioning alone (17 cases) and Group B: bimaxillary surgery (20 cases). Tracings were performed pre-operatively (T1), immediately post-operatively (T2) and at a minimum of one year follow-up (T3) (12–90 months).
In Group A, the maxilla was advanced (3.8 +_ 2.8 mm, p 0.05).
Late relapse due to condylar remodelling or resorption was found as a cause of large horizontal relapse (8.0 < x < 14.0 mm) in three cases (15%), the amount being associated with the amount of operative advancement (r = 0.7, r-sq = 40%, p < 0.01).
It was concluded that the correction of anterior open bite by posterior repositioning of the maxilla using rigid fixation is a stable procedure during the follow-up period, and that in bimaxillary cases, post-operative stability depends largely on the stability of the mandibular advancement, which in turn relates to the amounts of advancement, the pre-operative anterior open bite and the mandibular plane angle.

A retrospective cephalometric study was performed to investigate the stability of 37 non-growing anterior open-bite cases using mini-plate rigid fixation. The...

Anterior open-bite malocclusion: stability of maxillary repositioning using rigid internal fixation

Published Online: Dec 13, 2023

Page range: 69 - 81

Received: May 01, 1999

Accepted: Jan 01, 2000

DOI: https://doi.org/10.2478/aoj-2000-0010

Keywords
Anterior open bite, orthognathic surgery, stability, rigid fixation

© 2000 Premjit Arpornmaeklong et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Anterior open-bite malocclusion: stability of maxillary repositioning using rigid internal fixation

Published Online: Dec 13, 2023

Page range: 69 - 81

Received: May 01, 1999

Accepted: Jan 01, 2000

DOI: https://doi.org/10.2478/aoj-2000-0010

KeywordsAnterior open bite, orthognathic surgery, stability, rigid fixation

© 2000 Premjit Arpornmaeklong et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
Anterior open bite, orthognathic surgery, stability, rigid fixation