Effects of Class III Elastics on Stability of Orthopaedic Class III Correction
- Conditions
- Class III MalocclusionUnderbite
- Interventions
- Other: Upper-lower clear plastic retainers + Class III elasticsOther: Upper-lower clear plastic retainers
- Registration Number
- NCT04911400
- Lead Sponsor
- Sydney Local Health District
- Brief Summary
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.
- Detailed 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.
Recruitment & Eligibility
- Status
- ENROLLING_BY_INVITATION
- Sex
- All
- Target Recruitment
- 42
- 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
- Congenital anomalies or craniofacial syndromes
- Other orthodontic treatment
- Medical history that effects growth
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Upper-lower clear plastic retainers + Class III elastics Upper-lower clear plastic retainers + Class III elastics Upper-lower clear plastic retainers + Class III elastics Upper-lower clear plastic retainers Upper-lower clear plastic retainers Upper-lower clear plastic retainers
- Primary Outcome Measures
Name Time Method Difference in overjet of participants in the 2 study arms 5 years Measurement of overjet
- Secondary Outcome Measures
Name Time Method Difference in upper jaw position 5 years The difference in SNA angle measured on cephalometric radiographs between groups
Difference in upper-lower jaw relationship 5 years The difference in ANB angle measured on cephalometric radiographs between groups
Difference in upper incisor angulation 5 years The difference in upper incisor angle measured on cephalometric radiographs between groups
Periodontal health, including recession around the incisors 5 years Presence of gingival recession and prominence of lower incisors will be evaluated for both groups
Need for jaw surgery 5 years Need for surgery assessed by a panel of orthodontists
Difference in lower jaw position 5 years The difference in SNB angle measured on cephalometric radiographs between groups
Difference in lower incisor angulation 5 years The difference in lower incisor angle measured on cephalometric radiographs between groups
Compliance and ease of use of both retention regimens 5 years Questionnaire on the frequency and ease of use of both retainer regimens will be used
Effect of elastics on alignment retention 5 years Little's irregularity index will be used to compare both groups
Trial Locations
- Locations (2)
Sydney Dental Hospital
🇦🇺Surry Hills, New South Wales, Australia
Chatswood Orthodontics
🇦🇺Chatswood, New South Wales, Australia