Pubertal spurts in cranial base and mandible. Comparisons within individuals

Area of Science:

• Orthodontics
• Pediatric Growth and Development
• Craniofacial Biology

Background:

• Understanding craniofacial growth patterns during childhood and adolescence is crucial for diagnosing and treating developmental abnormalities.
• Cephalometric radiography provides valuable longitudinal data for analyzing skeletal growth.
• Puberty is a period of significant growth acceleration, but individual variations exist.

Purpose of the Study:

• To analyze serial cephalometric data to identify and characterize growth spurts in the cranial base and mandible during childhood and adolescence.
• To compare the timing, magnitude, and characteristics of pubertal growth spurts between boys and girls.
• To investigate the relationship between pubertal growth spurts and other developmental markers.

Main Methods:

• Longitudinal analysis of cephalometric radiographs from 67 children (34 boys, 33 girls) aged 7 to 18 years.
• Defined growth spurts based on specific increment thresholds for cranial base and mandibular growth.
• Defined pubescence as a 4-year period around peak height velocity.

Main Results:

• Pubertal growth spurts (FPS) occurred earlier in girls (1.6 years on average) but were 25-33% larger in boys.
• Growth rates before FPS were higher in girls, while rates after FPS were higher in boys.
• FPS timing showed weak correlations with ulnar sesamoid ossification, peak height velocity, or menarche, generally occurring after sesamoid ossification but before peak height velocity and menarche.

Conclusions:

• Craniofacial growth spurts exhibit distinct sex-specific patterns in timing and magnitude during puberty.
• The timing of pubertal craniofacial growth spurts is relatively independent of other major developmental milestones.
• Individual variations in growth spurt timing and magnitude are significant, with no clear association with pubertal tempo or final stature in boys.