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Comparative mechanical testing for different orthodontic aligner materials over time - in vitro study.

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Mechanical testing reveals that Polyethylene terephthalate glycol (PETG) aligner materials do not significantly impact orthodontic forces. The forces generated by different PETG aligners remained consistent over 12 hours, showing no degradation.

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Area of Science:

  • Biomaterials Science
  • Orthodontics
  • Mechanical Engineering

Background:

  • Orthodontic treatment increasingly utilizes thermoplastic aligners.
  • Polyethylene terephthalate glycol (PETG) is a common material for these aligners.
  • Understanding the mechanical properties of PETG aligners is crucial for predictable treatment outcomes.

Purpose of the Study:

  • To mechanically evaluate and compare the forces exerted by different orthodontic aligners made from PETG over a 12-hour period.
  • To determine if the manufacturing company influences the mechanical forces produced by PETG aligners.

Main Methods:

  • Twelve PETG aligner specimens were fabricated using CAD/CAM technology and thermoforming machines (Duran and Erkodur).
  • Mechanical testing was performed using a universal testing machine to measure forces over 12 hours with a 0.3 mm displacement.
  • Statistical analysis, including R2-regression, was employed to analyze force behavior over time.

Main Results:

  • No statistically significant difference in maximum force was observed between the Duran and Erkodur PETG aligner groups (p=0.071).
  • The mechanical testing demonstrated cubic properties of the materials over the 12-hour duration.
  • Force levels showed no tendency towards a lower boundary over time.

Conclusions:

  • The manufacturing company of PETG aligners does not influence the resulting mechanical forces.
  • PETG material properties ensure consistent force delivery over a 12-hour period.
  • These findings support the reliability of PETG aligners in orthodontic applications.