Measurement of tooth movement

Area of Science:

• Orthodontics
• Craniofacial Biology
• Dental Anatomy

Background:

• Accurate measurement of tooth movement necessitates stable reference points in the alveolar bone.
• Bone remodeling on surfaces makes them unreliable for precise long-term landmark tracking.
• Implants offer superior stability for tracking tooth movement compared to other methods.

Purpose of the Study:

• To analyze the relationship between skeletal growth vectors and dental changes.
• To investigate how dental compensations mask underlying skeletal growth disproportionalities.
• To provide a framework for understanding and treating vertical and anteroposterior growth discrepancies.

Main Methods:

• Superimposition on stable bone landmarks (implants) for precise tooth movement analysis.
• Separation of growth into vertical and anteroposterior vectors relative to the dentition and occlusal plane.
• Analysis of dental compensations in response to skeletal growth patterns like mandibular rotation and anteroposterior discrepancies.

Main Results:

• Dental changes may not linearly correlate with growth vectors, especially during jaw rotations.
• Disproportionate vertical or anteroposterior growth can lead to open bite, deep bite, Class II, or Class III malocclusions.
• Teeth often migrate in opposition to growth disproportionalities, masking the underlying skeletal issue.

Conclusions:

• Stable bone landmarks are crucial for accurate assessment of tooth movement.
• Dental compensations can obscure significant skeletal growth problems, complicating diagnosis and treatment.
• Understanding the interplay between skeletal growth and dental adaptation is key for effective orthodontic and surgical correction.