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Related Experiment Video

Updated: Jun 4, 2026

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Published on: February 23, 2024

Correlation between skeletal changes by maxillary protraction and upper airway dimensions.

Ji-Won Lee¹, Ki-Ho Park, Seong-Hun Kim

¹Graduate School of Dentistry, Kyung Hee University, Dongdaemoon-Ku, Seoul, South Korea.

The Angle Orthodontist

|February 9, 2011

Summary

This summary is machine-generated.

Maxillary protraction treatment in skeletal Class III children significantly improves nasopharyngeal airway dimensions. This orthodontic approach enhances the airway by increasing maxillary forward displacement and influencing mandibular growth.

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Area of Science:

Orthodontics
Craniofacial Development
Airway Physiology

Background:

Skeletal Class III malocclusion often presents with a constricted upper airway.
Maxillary protraction is a common orthodontic treatment for Class III malocclusion.
Understanding the impact on airway dimensions is crucial for treatment planning.

Purpose of the Study:

To investigate the correlation between skeletal changes from maxillary protraction and sagittal airway dimensions.
To assess the effects on tongue, soft palate, and hyoid bone position.
To evaluate changes in nasopharyngeal airway measurements.

Main Methods:

Study included 20 skeletal Class III patients (mean age 9.4 years) treated with maxillary protraction.
Pretreatment and posttreatment cephalometric radiographs were analyzed.
Pearson's correlation analysis assessed relationships between craniofacial morphology and airway/hyoid position.

Main Results:

Maxillary protraction led to significant maxillary forward displacement and inhibited mandibular growth.
Nasopharyngeal airway measurements (PNS-ad1, PNS-ad2) increased by 1.4 mm and 1.9 mm, respectively.
A positive correlation was found between maxillary protraction and increased nasopharyngeal airway dimensions.

Conclusions:

Maxillary protraction can effectively improve nasopharyngeal airway dimensions in skeletal Class III children.
Short-term improvements in airway space are achievable with this treatment modality.
Further research may explore long-term effects and associated soft tissue changes.