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Related Experiment Videos

Acrylic removable appliances: comparative evaluation of different postpolymerization methods.

Andreas Faltermeier1, Martin Rosentritt, Dieter Müssig

  • 1Department of Orthodontics, University of Regensberg, Regensburg, Germany. andreas.faltermeier@klinik.uni-regensburg.de

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|March 10, 2007
PubMed
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Postpolymerization heat treatment improves the mechanical properties and reduces water absorption in removable orthodontic appliance resins, enhancing their safety and durability for patients.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Orthodontic Technology

Background:

  • Polymeric components in removable orthodontic appliances can pose risks due to residual monomers, potentially causing allergic reactions.
  • Degree of conversion significantly impacts resin properties, including water uptake, color stability, and mechanical performance.

Purpose of the Study:

  • To investigate the impact of various postpolymerization techniques on the physical and mechanical properties of common orthodontic resins.
  • To determine if secondary curing methods can mitigate issues associated with residual monomers and improve resin performance.

Main Methods:

  • Three types of orthodontic resins (Orthocryl, Palapress, Pro Base Cold) were tested, with 20 specimens per group.
  • Specimens underwent different postpolymerization treatments: oven curing (40°C or 80°C), microwave curing (600W for 5 or 10 minutes), and conventional cold curing (control).

Related Experiment Videos

  • Evaluated properties included water sorption, fracture toughness, and Vickers hardness.

    • Main Results:

    • Postpolymerization, particularly with heat, led to slight increases in fracture toughness and Vickers hardness.
    • Heat-treated resins exhibited reduced water uptake compared to conventionally cured samples.
    • Microwave curing did not show significant improvements over conventional methods for the tested properties.

    Conclusions:

    • Heat-assisted postpolymerization is an effective method for enhancing the material properties of resins used in removable orthodontic appliances.
    • Improved properties, such as reduced water uptake and increased hardness, suggest better clinical performance and patient safety.