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Effects of Class III Elastics on Stability of Orthopaedic Class III Correction

S

Sydney Local Health District

Status

Invitation-only

Conditions

Class III Malocclusion
Underbite

Treatments

Other: Upper-lower clear plastic retainers + Class III elastics
Other: Upper-lower clear plastic retainers

Study type

Interventional

Funder types

Other

Identifiers

NCT04911400
X19-0365

Details and patient eligibility

About

The purpose of this study is to evaluate the effects of adding elastics to orthodontic retainers on the stability of class III correction and whether it reduces the need for jaw surgery.

Full description

Over the years many types of appliances have been recommended for retaining Class III correction in growing children such as intermaxillary splints, class III activator, Frankel 3, Class III twin block, continued use of face-mask and chin-cup. However, currently none of these are in routine use and there is no evidence on the long term effectiveness of any retention protocol for class III correction.

One of the most commonly used retainers following orthodontic treatment is clear plastic retainers. There are no studies that investigated whether using class III elastics in combination with clear plastic retainers improves the stability of class III correction and reduces the need for later jaw surgery.

Enrollment

42 estimated patients

Sex

All

Ages

12 to 16 years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

  • Patients that completed their orthodontic treatment for the management of their skeletal class III with upper jaw retrusion that was treated with Class III orthopaedic appliances, followed by full fixed appliances.
  • No congenital anomalies or craniofacial syndromes
  • No other orthodontic treatment
  • No medical history that effects growth

Exclusion criteria

  • Congenital anomalies or craniofacial syndromes
  • Other orthodontic treatment
  • Medical history that effects growth

Trial design

Primary purpose

Prevention

Allocation

Randomized

Interventional model

Parallel Assignment

Masking

Single Blind

42 participants in 2 patient groups

Upper-lower clear plastic retainers + Class III elastics
Experimental group
Description:
Upper-lower clear plastic retainers + Class III elastics
Treatment:
Other: Upper-lower clear plastic retainers + Class III elastics
Upper-lower clear plastic retainers
Active Comparator group
Description:
Upper-lower clear plastic retainers
Treatment:
Other: Upper-lower clear plastic retainers

Trial contacts and locations

2

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Data sourced from clinicaltrials.gov

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