Differential alveolar bone modeling after orthodontic retraction.

Area of Science:

• Dentistry
• Orthodontics
• Oral Surgery

Background:

• Irregular, hard nodular protuberances on the labial alveolar bone after anterior teeth retraction in adults resemble exostoses.
• These bony protuberances have been attributed to loading but lack specific characterization.

Purpose of the Study:

• To investigate the nature of labial bony protuberances observed after orthodontic retraction of anterior teeth.
• To differentiate these protuberances from true exostoses.

Main Methods:

• Case reports of three patients with multiple labial bony protuberances after anterior teeth retraction.
• Evaluation using serial clinical photographs, lateral cephalograms, digital models, and cone-beam computed tomography (CBCT) scans.
• 3-dimensional superimpositions of digital models and CBCT scans for detailed analysis.

Main Results:

• The irregular protuberances developed and became more prominent during orthodontic retraction.
• Analysis revealed the protuberances are due to differential alveolar bone modeling, not bone overgrowth.
• Bone resorption over the tooth root was greater than interdental bone resorption.

Conclusions:

• The observed labial bony protuberances are a result of differential bone modeling, not true exostoses.
• These may cause esthetic or comfort concerns for patients, perceived as 'outgrowths'.
• Clinicians should be aware of this phenomenon in cases involving significant anterior teeth retraction and root movement; alveoloplasty may be considered for psychosocial issues.