CAD/CAM nitinol bonded retainer versus a chairside bonded retainer: a multicentre randomised controlled trial
| ISRCTN | ISRCTN17122529 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN17122529 |
| Integrated Research Application System (IRAS) | 185443 |
| Protocol serial number | Protocol Number: DT16/86705, IRAS Number: 185443, REC Number 16/YH/0463. |
| Sponsor | Leeds Dental Institute |
| Funders | Investigator initiated and funded, National Institute for Health Research (NIHR) (additional funding) |
- Submission date
- 30/12/2017
- Registration date
- 12/02/2018
- Last edited
- 05/04/2024
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Oral Health
Plain English summary of protocol
Background and study aims
Following orthodontic brace treatment the teeth are held in their new position by orthodontic appliances called retainers. One type of retainer is called a bonded retainer which is a small metal wire glued behind the front teeth. This study is looking at the use of two different types of bonded retainer to find out which is better: one that is shaped by the orthodontist, or one that has been made from a mould of the teeth by a computer. The study looks at which holds the teeth in their new position the best, which patients prefer and which is the most cost effective.
Who can participate?
Participants who have undergone a course of orthodontic treatment and who now require a retainer
What does the study involve?
Participants are randomly allocated to one of two groups to be treated with either a Memotain bonded retainer or an Ortho FlexTech bonded retainer. Participants are followed up over a 5-year period to determine the effectiveness of the retainers at maintaining the stability of the teeth after orthodontic treatment.
What are the possible benefits and risks of participating?
The benefit to patients is that they are followed up for longer than normal (5 years). The study will help to show the best type of retainer for certain patients. The current research suggests there are no associated risks with wearing retainers.
Where is the study run from?
1. Leeds Dental Institute (UK)
2. St Luke's Hospital (UK)
3. Beverley Orthodontic Centre (UK)
When is the study starting and how long is it expected to run for?
September 2017 to January 2019
Who is funding the study?
1. Investigator initiated and funded
2. National Institute for Health Research (NIHR) (additional funding) (UK)
Who is the main contact?
1. Adam Jowett
2. Simon Littlewood
Contact information
Scientific
St Luke's Hospital
Little Horton Lane
Bradford
BD5 0NA
United Kingdom
Scientific
St Luke's Hospital
Little Horton Lane
Bradford
BD5 0NA
United Kingdom
Study information
| Primary study design | Interventional |
|---|---|
| Study design | Multicentre prospective two-arm parallel-group randomised controlled trial with a 1:1 allocation |
| Secondary study design | Randomised controlled trial |
| Study type | Participant information sheet |
| Scientific title | CAD/CAM nitinol bonded retainer versus a chairside bonded retainer: a multicentre randomised controlled trial |
| Study objectives | Null hypothesis: There is no significant difference in stability, survival rate, patient satisfaction, and cost-effectiveness between using a CAD/CAM nitinol bonded retainer (Memotain) and a chairside bonded retainer (Ortho FlexTech). |
| Ethics approval(s) | Yorkshire & The Humber - Bradford Leeds Research Ethics Committee, 07/07/2017, REC ref: 16/YH/0463, protocol number: DT16/86705 |
| Health condition(s) or problem(s) studied | Orthodontic relapse |
| Intervention | 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. Block sizes of 2, 4 and 6 will be used. Group 1: Memotain bonded retainer Group 2: Ortho FlexTech bonded retainer Patients are followed up to determine the efficacy of a CAD/CAM nitinol bonded retainer (Memotain) compared with a chairside bonded retainer (Ortho FlexTech) at maintaining the stability of the upper and lower arches after orthodontic treatment. |
| Intervention type | Device |
| Phase | Not Applicable |
| Drug / device / biological / vaccine name(s) | Not provided at time of registration |
| Primary outcome measure(s) |
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. |
| Key secondary outcome measure(s) |
Assessed at the 6 week, 6 month, 1 year, 2 year and 5 year review appointments: |
| Completion date | 11/01/2019 |
Eligibility
| Participant type(s) | Patient |
|---|---|
| Age group | All |
| Sex | All |
| Target sample size at registration | 100 |
| Total final enrolment | 63 |
| Key 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 |
| Key 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 |
| Date of first enrolment | 20/10/2017 |
| Date of final enrolment | 05/07/2019 |
Locations
Countries of recruitment
- United Kingdom
- England
Study participating centres
Clarendon Way
Leeds
LS2 9LU
United Kingdom
Bradford
BD5 0NA
United Kingdom
Beverley
HU17 9HL
United Kingdom
Results and Publications
| Individual participant data (IPD) Intention to share | Yes |
|---|---|
| IPD sharing plan summary | Other |
| IPD sharing plan | The datasets generated and/or analysed during the current study will be included in the subsequent results publication. |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Results article | 01/03/2023 | 23/03/2023 | Yes | No | |
| HRA research summary | 26/07/2023 | No | No | ||
| Participant information sheet | Participant information sheet | 11/11/2025 | 11/11/2025 | No | Yes |
Editorial Notes
05/04/2024: The overall end date was changed from 04/07/2025 to 11/01/2019.
23/03/2023: Publication reference added.
11/12/2019: The following changes have been made:
1. The recruitment end date has been changed from 17/10/2019 to 05/07/2019.
2. The overall trial end date has been changed from 11/09/2025 to 04/07/2025.
3. The total final enrolment number has been changed from 65 to 63.
18/10/2019: The following changes were made to the trial record:
1. The recruitment end date was changed from 11/09/2019 to 17/10/2019.
2. The intention to publish date was changed from 11/09/2026 to 11/10/2020.
3. The total final enrolment was added.
12/10/2018: The following updates were made:
1. The recruitment end date was updated from 11/09/2018 to 11/09/2019
2. The overall trial end date was updated from 11/09/2023 to 11/09/2025
3. The intention to publish date was updated from 31/12/2020 to 11/09/2026
