None listed
Conditions
Brief summary
Clear orthodontic retainers are frequently worn by patients after orthodontic treatment to prevent dental relapse and provide retention, which means to hold the teeth straight and not letting them move back to where they were. This procedure involves wearing retainers formed by clear sheets of polymerised plastic overnight after the braces are removed to provide the retention of teeth alignment. Teeth whitening is very commonly considered after patients have their braces removed to improve the aesthetic outcome. The gold standard of at-home whitening is to custom make whitening tray for patients using polymerised plastic with or without reservoir. Due to the similarities of wearing protocol, some practitioners instruct their patient to use the clear orthodontic retainers as whitening tray and carry the whitening material. However, the effect of whitening material on the biomechanical properties on the tray is unknown. The proposed research aims to address current deficits in our knowledge by investigating the biomechanical change in the clear orthodontic retainers when they are used as whitening trays. The change of tooth position and tooth colour will also be observed.
Interventions
A split-mouth design will be used. Participants will be randomised into two groups after the completion of orthodontic treatment. Clear orthodontic retainers will be made for both the maxillary (upper) and the mandibular (lower) arch.
Group A will receive at-home whitening treatment using 10% carbamide peroxide in the maxillary arch only.
Group B will receive at-home whitening treatment using 10% carbamide peroxide in the mandibular arch only
Participants will apply 10% carbamide peroxide in t
A split-mouth design will be used. Participants will be randomised into two groups after the completion of orthodontic treatment. Clear orthodontic retainers will be made for both the maxillary (upper) and the mandibular (lower) arch. Group A will receive at-home whitening treatment using 10% carbamide peroxide in the maxillary arch only. Group B will receive at-home whitening treatment using 10% carbamide peroxide in the mandibular arch only Participants will apply 10% carbamide peroxide in the treating arch retainer overnight (approximately 6-8 hours) daily for 2 weeks. Orthodontic postgraduate student will be administering the intervention. Patients will be reviewed 1 week, 2 week and 4 weeks after commencement to monitor adherence.
Sponsors
University of Otago
Study design
Allocation
Randomised controlled trial
Intervention model
Crossover
Primary purpose
Treatment
Masking
Blinded (masking used) (Caregiver, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
All
Age
10 Years to No maximum
Healthy volunteers
No
Inclusion criteria
Subjects who have finished active orthodontic treatment with twelve vital anterior teeth from canine to canine with no direct or indirect restorations, no need for attachments or divots on the labial surfaces of the maxillary canines or incisors, no history of dentine hypersensitivity and no history of tooth whitening during the previous three years. If the patient is less than 16 years old, consent will be required from the parents/guardian.
Exclusion criteria
Subjects who are smokers, pregnant or breastfeeding, have active caries or periodontal disease, have severe fluorosis or tetracycline staining, or with known allergic reactions to whitening materials.
Outcome results
None listed