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

<italic>Objective:</italic> To identify predictors of overjet reduction, changes in mandibular length (Co-Me) and antero-posterior changes in mandibular position (Pog-Vert) during Twin Block therapy.
<italic>Methods:</italic> Pre- and post-treatment cephalograms of 131 participants were analysed (Mean age 12.73 years ± 1) following Twin Block therapy.
<italic>Results:</italic> Mean annualised overjet reduction was 7.29 mm (± 2.99) with chin projection improving by 2.66 mm (± 5.37). The magnitude of the initial overjet was a strong predictor (95% CI: 0.30, 0.77, <italic>p</italic> &lt; 0.01) of overjet reduction and change in chin position (95% CI: 0.08, 0.77, <italic>p</italic> = 0.02). Greater forward movement of Pogonion occurred if there was greater retrusion of Pogonion at the outset (95% CI: 0.15, 0.45, <italic>p</italic> &lt; 0.01). No prognostic relationship was noted for other potential cephalometric predictors including pretreatment mandibular lower border morphology and Co-Go-Me angle.
<italic>Conclusion:</italic> No relationship between mandibular morphology, vertical skeletal pattern and favourable dentoalveolar and skeletal responses to Twin Block therapy could be found. These results require confirmation on an external sample.
</abstract>

Objective: To identify predictors of overjet reduction, changes in mandibular length (Co-Me) and antero-posterior changes in mandibular position (Pog-Vert) during Twin Block therapy.
Methods: Pre- and post-treatment cephalograms of 131 participants were analysed (Mean age 12.73 years ± 1) following Twin Block therapy.
Results: Mean annualised overjet reduction was 7.29 mm (± 2.99) with chin projection improving by 2.66 mm (± 5.37). The magnitude of the initial overjet was a strong predictor (95% CI: 0.30, 0.77, p < 0.01) of overjet reduction and change in chin position (95% CI: 0.08, 0.77, p = 0.02). Greater forward movement of Pogonion occurred if there was greater retrusion of Pogonion at the outset (95% CI: 0.15, 0.45, p < 0.01). No prognostic relationship was noted for other potential cephalometric predictors including pretreatment mandibular lower border morphology and Co-Go-Me angle.
Conclusion: No relationship between mandibular morphology, vertical skeletal pattern and favourable dentoalveolar and skeletal responses to Twin Block therapy could be found. These results require confirmation on an external sample.

An investigation of cephalometric and morphological predictors of successful Twin Block therapy

Australasian Orthodontic Journal

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

Objective: To identify predictors of overjet reduction, changes in mandibular length (Co-Me) and antero-posterior changes in mandibular position (Pog-Vert)...

An investigation of cephalometric and morphological predictors of successful Twin Block therapy

Published Online: Aug 01, 2023

Page range: 190 - 196

Received: Mar 01, 2012

Accepted: Jul 01, 2012

DOI: https://doi.org/10.2478/aoj-2012-0016

© 2012 Padhraig S. Fleming et al., published by Sciendo

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