Palatal configuration in Class II Division 1 malocclusion: a longitudinal study.

Area of Science:

• Orthodontics
• Dental Morphology
• Craniofacial Development

Background:

• Class II Division 1 malocclusions present unique challenges in orthodontic treatment.
• Understanding palatal contour changes is essential for effective nonextraction strategies.

Purpose of the Study:

• To evaluate palatal contour changes during nonextraction orthodontic treatment.
• To assess the long-term stability of these palatal alterations.
• To analyze effects in patients with Class II Division 1 malocclusions.

Main Methods:

• Maxillary study models were analyzed pre-treatment, post-treatment, and over 5 years post-retention.
• Digital pantograph measurements included palatal width, base width, palatal height, and alveolar angle.
• Evaluations were conducted in the canine, second premolar, and first molar regions.

Main Results:

• Treatment increased transverse dimensions (palatal and base widths) and palatal height in premolar and molar regions, with decreased alveolar angle.
• Post-retention showed canine region modifications and stable alveolar angulation.
• The molar region exhibited decreased palatal width and alveolar angulation after retention.

Conclusions:

• Favorable transverse gain of the palatal base, whether from growth or orthodontic intervention, is critical for long-term stability.
• Transverse gain in palatal base width during Class II treatment helps offset expected transverse loss and alveolar angle decrease.
• Maintaining palatal base width is key for stable orthodontic outcomes in Class II malocclusions.