Postorthodontic dental changes: a longitudinal study

Area of Science:

• Orthodontics
• Dental Growth and Development
• Cephalometric Analysis

Background:

• Orthodontic treatment typically occurs during adolescence, a period of significant skeletal growth.
• Skeletal growth continues at a slower pace into adulthood, potentially influencing long-term orthodontic outcomes.
• Maintaining stable and esthetic dental relationships post-treatment requires ongoing evaluation.

Purpose of the Study:

• To assess long-term dental and skeletal changes in adults following comprehensive orthodontic treatment.
• To differentiate between true dental changes and those resulting from continued skeletal growth.
• To evaluate the stability of orthodontic results into adulthood.

Main Methods:

• Longitudinal study of 36 individuals who underwent comprehensive orthodontic treatment.
• Cephalometric analysis of dental and skeletal changes from the in-treatment phase through two adult recalls (ages ~22 and ~30).
• Assessment of specific dental relationship variables, including FMIA, IMPA, and molar angulation.

Main Results:

• Significant changes in absolute tooth positions were observed, primarily due to continued growth of skeletal reference structures, not intrinsic dental changes.
• Skeletal growth continued at a slow rate between the ages of ~22 and ~30.
• Key dental relationship measurements (FMIA, IMPA, molar angulation) showed no systematic changes after orthodontic treatment completion.

Conclusions:

• Post-orthodontic treatment dental stability is largely maintained, with observed positional shifts mainly driven by residual skeletal growth.
• Long-term monitoring is crucial for understanding the influence of adult skeletal development on orthodontic outcomes.
• Orthodontic interventions achieve stable dental relationships that persist into adulthood, despite ongoing, albeit slow, skeletal changes.