Age-Specific Three-Dimensional Mandibular Norms as an Adjunctive Tool for Detecting Mandibular Growth Disturbances: A...

Area of Science:

• Dentistry
• Radiology
• Orthodontics

Background:

• Normative 3D mandibular data in individuals without temporomandibular joint (TMJ) alterations are scarce.
• Accurate diagnostic tools are crucial for identifying mandibular growth disturbances.

Purpose of the Study:

• To establish age-stratified, cone-beam computed tomography (CBCT)-based normative parameters for mandibular size and condylar morphology.
• To provide reference values for skeletal symmetry and absence of radiographic TMJ alterations.

Main Methods:

• 213 CBCT scans from individuals with skeletal symmetry and no radiographic TMJ alterations were analyzed.
• Quantified condylar volume, mandibular ramus length, body length, and condylar corticalization.
• Analyzed data by age group, sex, and facial biotype using statistical models.

Main Results:

• Established sex-specific and age-specific reference values for mandibular dimensions and condylar volume.
• Complete condylar corticalization correlated strongly with age, with an optimal cutoff at 17 years.
• Normative dataset provides objective benchmarks for mandibular growth.

Conclusions:

• CBCT-derived normative values enhance diagnostic accuracy for mandibular growth disorders.
• Complete condylar corticalization is a reliable marker for mandibular ramus growth and maturation.
• Provides clinically useful reference thresholds for dentofacial assessment.