Orthodontic relapse Oral Health
Conditions
Interventions
Simple randomisation will be used to allocate patients to one of the two groups. The randomisation website: www.sealedenvelope.com will be used to allocate patients to treatment group 1 or group 2. Bl
Sponsors
Leeds Dental Institute
Eligibility
Sex/Gender
All
Inclusion criteria
Inclusion criteria: Each subject will: 1. Have undergone a course of upper and lower fixed appliance orthodontic treatment with satisfactory correction of the presenting malocclusion, where the treating clinician feels that retention is required 2. Have a full and normal complement of teeth in the upper and lower labial segments (incisors and canines) with these teeth being of normal size and shape 3. Brush their teeth at least twice per day 4. Be in good health 5. Be willing and able to comply with the trial regime 6. Have given written informed consent Subjects may: 1. Have received treatment at any of the research sites 2. Have had dental extractions (premolar or molar) or a non-extraction approach 3. Have had other orthodontic treatment (e.g. removable or functional appliances) as part of their orthodontic treatment 4. Have undergone adjunctive surgical treatment, whether minor oral surgery to expose a tooth or orthognathic surgery to correct the position of the jaws
Exclusion criteria
Exclusion criteria: Subjects with: 1. Nickel allergy 2. Cleft palate and/or other severe facial deformity 3. Poor periodontal health including the presence of supragingival or subgingival calculus or periodontal pocketing greater than 3.5mm as determined by a basic periodontal examination (BPE) probe 4. Gross or uncontrolled caries 5. Prosthodontic requirement in the upper or lower arch at end of treatment 6. Restorations on the palatal/lingual surfaces of upper or lower incisors or canines 7. A starting malocclusion requiring extreme transverse correction
Design outcomes
Secondary
| Measure | Time frame |
|---|---|
| Assessed at the 6 week, 6 month, 1 year, 2 year and 5 year review appointments: 1. The survival rate of each retainer type 2. The patient satisfaction with each retainer type Assessed at the 1 year and 5 year review appointments: 1. The cost-effectiveness of each retainer type | — |
Primary
| Measure | Time frame |
|---|---|
| Stability measured by changes in Little's Irregularity Index, and the width of the upper and lower dental arches measured by inter-canine and inter-molar width. In extraction cases, the trialists will also assess whether or not the extraction space re-opens. These measurements will be carried out on orthodontic study models taken at the debond appointment, and the 6 month, 1 year, 2 year and 5 year review appointments. | — |
Countries
England, United Kingdom
Outcome results
None listed