Evaluating Clear Aligner Performance by Bone Strain Measurement: A Novel Experimental Approach.

Area of Science:

• Biomedical Engineering
• Orthodontics
• Dental Biomechanics

Background:

• Clear aligner therapy is popular but often yields suboptimal outcomes.
• Existing methods for evaluating aligner performance lack realistic simulation due to the absence of a periodontal ligament.
• Bone strain offers a novel indicator for assessing biomechanical performance in orthodontics.

Purpose of the Study:

• To introduce and evaluate a novel method for assessing clear aligner performance using bone strain as a key indicator.
• To overcome limitations of previous experimental studies that did not incorporate a periodontal ligament.
• To provide a more realistic simulation of orthodontic processes in experimental models.

Main Methods:

• Developed an experimental device with a dental model featuring a periodontal ligament substitute (polyvinyl siloxane).
• Integrated a strain measurement system with strain gauges embedded in the bone component.
• Simulated orthodontic treatment of a proclined maxillary central incisor, measuring bone strain under varying forces and aligner activation angles (1-2 degrees).

Main Results:

• Successfully fabricated a periodontal ligament substitute with uniform thickness.
• Validated strain gauges for satisfactory accuracy against theoretical predictions.
• Demonstrated the device's ability to reliably detect bone strain variations with different force levels and aligner activation angles.

Conclusions:

• The proposed method and device are effective for evaluating clear aligner performance.
• This novel approach offers significant potential for comparative studies of clear aligner designs and treatment protocols.
• The findings contribute to advancements in orthodontic research and the potential for improved clinical outcomes.