A longitudinal cephalometric study of postorthodontic craniofacial changes

Area of Science:

• Orthodontics
• Craniofacial Growth
• Cephalometric Analysis

Background:

• Orthodontic treatment focuses on diagnosis and correction, but long-term posttreatment changes are less understood.
• Relapse and continued growth significantly impact treatment stability over time.
• Limited research exists on cephalometric changes years after orthodontic treatment completion.

Purpose of the Study:

• To investigate long-term cephalometric changes after orthodontic treatment.
• To assess the influence of continued growth and potential relapse on treatment outcomes.
• To evaluate changes in linear dimensions and arch relationships over 14 years post-treatment.

Main Methods:

• Longitudinal cephalometric study of 36 patients.
• Recalls at approximately 5.5 and 14.4 years after treatment.
• Analysis of linear dimensions and key arch relationship variables (ANB, NAP, AOBO, Y-axis).

Main Results:

• Significant increases in most linear dimensions between treatment end and first recall (ages 16-21), attributed to adolescent growth.
• Few significant changes in linear dimensions between first and second recall (ages 21-30).
• Arch relationships showed continued improvement post-treatment, likely due to late mandibular growth, with minimal changes between recalls.

Conclusions:

• Orthodontic relapse, if it occurs, is typically evident early post-treatment and diminishes over time.
• Continued craniofacial growth generally supports and enhances orthodontic correction.
• Long-term stability is expected, with minimal alterations observed in the decade following initial post-treatment changes.