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Related Experiment Video

Updated: May 3, 2026

2-Methacryloyloxyethyl Phosphorylcholine Polymer Treatment of Complete Dentures to Inhibit Denture Plaque Deposition
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Masticatory function between chewing with and without wearing clear thermoplastic appliances.

Rungtiwa Jirawiwatsaree1, Chidsanu Changsiripun2

  • 1Department of Orthodontics, Faculty of Dentistry, Chulalongkorn University, Henri-Dunant Road, 10330, Wangmai, Patumwan, Bangkok, Thailand.

BMC Oral Health
|November 5, 2024
PubMed
Summary

Wearing clear retainers while eating temporarily reduces chewing efficiency. However, masticatory function significantly improves to normal levels within three months, with no associated patient factors identified.

Keywords:
Clear thermoplastic applianceMasticatory performanceMultiple sieve methodOrthodonticsSubjective food intake ability

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Area of Science:

  • Oral appliance therapy
  • Orthodontic treatment outcomes
  • Masticatory function assessment

Background:

  • Clear thermoplastic materials are common in oral appliances like retainers.
  • Patients sometimes wear these retainers during eating.
  • The impact of retainers on chewing efficiency was previously unstudied.

Purpose of the Study:

  • To evaluate changes in masticatory function with and without clear retainers over six months.
  • To identify factors associated with any observed differences in chewing efficiency.

Main Methods:

  • Thirty patients with clear retainers were assessed at baseline, 3, and 6 months.
  • Objective masticatory function was measured by median particle size (MPS).
  • Subjective masticatory function was assessed using the food intake ability (FIA) test.

Main Results:

  • Chewing with retainers initially showed reduced efficiency (higher MPS, lower FIA scores).
  • Masticatory function significantly improved by the 3-month follow-up, comparable to chewing without retainers.
  • No significant association was found between age, sex, or treatment type and changes in masticatory function.

Conclusions:

  • Wearing clear retainers during chewing temporarily impairs masticatory function immediately post-orthodontic treatment.
  • Masticatory function recovers to baseline levels within three months.
  • Patient demographics and treatment history did not influence the adaptive changes in chewing efficiency.