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Retainers & Finishing

Theroux Phase I Retainer

Flexible retention for the transitional dentition.

Phase I (Theroux) retainers, clear posterior segments on white models

Removable · Scan or impression

Send us a case

Scan or impressions, a bite where the design needs one, and a signed prescription. If anything on the Rx is left open, a technician calls your practice before the case is started.

Print it or save it as a PDF, then send it with the case.

Download the Rx form or call 866-437-4361.

The Theroux-style Phase I Retainer is designed to maintain arch form following early expansion or interceptive orthodontic treatment while allowing permanent teeth to continue erupting.

Its design is particularly useful during the mixed-dentition phase, when conventional full-coverage retention may interfere with normal eruption.

Commonly prescribed for

  • Retention between Phase I and Phase II
  • Holding expansion in the mixed dentition

Construction and adjustment

Design
Clear thermoformed or acrylic plate, relieved for eruption
Retention
On teeth that are staying
Records
Scan or impression, opposing bite, eruption notes

You specify

  • Clear or Hawley-type
  • Teeth to relieve
  • Colour

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