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

N/AEnrolling By InvitationNCT04911400

Sydney Local Health District42 enrolled

Overview

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.

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.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

PREVENTION

Masking

SINGLE

Enrollment

Conditions

Class III Malocclusion Underbite

Interventions

Upper-lower clear plastic retainers + Class III elasticsOTHER

Addition of Class III elastics to clear plastic retainers

Upper-lower clear plastic retainersOTHER

Upper-lower clear plastic retainers

Eligibility

Sex: ALLMin age: 12 YearsMax age: 16 YearsHealthy volunteers:

Medical Language ↔ Plain English

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

Locations (2)

Chatswood Orthodontics

Chatswood, New South Wales, Australia

Sydney Dental Hospital

Surry Hills, New South Wales, Australia

Outcomes

Primary Outcomes

Difference in overjet of participants in the 2 study arms

Measurement of overjet

Time frame: 5 years

Secondary Outcomes

Need for jaw surgery

Need for surgery assessed by a panel of orthodontists

Time frame: 5 years

Difference in upper jaw position

The difference in SNA angle measured on cephalometric radiographs between groups

Time frame: 5 years

Difference in lower jaw position

The difference in SNB angle measured on cephalometric radiographs between groups

Time frame: 5 years

Difference in upper-lower jaw relationship

The difference in ANB angle measured on cephalometric radiographs between groups

Time frame: 5 years

Difference in upper incisor angulation

The difference in upper incisor angle measured on cephalometric radiographs between groups

Time frame: 5 years

Difference in lower incisor angulation

The difference in lower incisor angle measured on cephalometric radiographs between groups

Time frame: 5 years

Compliance and ease of use of both retention regimens

Questionnaire on the frequency and ease of use of both retainer regimens will be used

Time frame: 5 years

Data from ClinicalTrials.gov

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