An observational study in Orthodontic Retainers and Tooth Mobility, sponsored by Marmara University. Active, not recruiting at 1 site in Turkey (Türkiye). Open to participants aged 18 Years to 35 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-09-24.
Sponsored by Marmara University · Observational
The purpose of this prospective clinical study is to comparatively evaluate the long-term stability of teeth, physiological tooth mobility, and effects on periodontal tissues of three different fixed lingual retainer materials used to prevent relapse following orthodontic treatment. A total of 80 participants whose orthodontic treatment is completed will be randomly and equally distributed into four groups as one control (n=20) and three study groups (n=20 each): Group 1 will receive CAD/CAM-fabricated 0.016-inch Nitinol wire; Group 2 will receive manually bent multi- strand 0.0215-inch stainless steel wire; and Group 3 will receive 0.030-inch stainless steel chain retainers. Control group will be 20 samples. Clinical and radiographic measurements will be performed at the day of debonding (T0) and at a 6-month follow-up (T1). Physiological tooth mobility will be measured objectively using a Periotest device. Relapse amounts will be assessed by superimposing intraoral digital scans via Nemocast software using Little's Irregularity Index, and the 6-month failure/breakage rates of the retainers will be recorded. The null hypothesis states that there is no statistically significant difference among the different retainer materials regarding tooth stability, relapse, and physiological mobility.
Marmara University is the lead sponsor of 599 studies on the registry; 138 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Healthy volunteers whose orthodontic treatment finalized and who waited for taking off braces.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
healthy gingiva, no smoking, non-pregnant, age:18-35, patients did not receive any orthodontic treatment and don't have bruxism and syndrome
Diagnostic Test: Mobility measurement with Periotest device · Diagnostic Test: Digital intraoral impression
Just finished orthodontic treatment, healthy gingiva, no smoking, non-pregnant, age:18-35, patients don't have bruxism and syndrome
Diagnostic Test: Mobility measurement with Periotest device · Diagnostic Test: Digital intraoral impression
Just finished orthodontic treatment, healthy gingiva, no smoking, non-pregnant, age:18-35, patients don't have bruxism and syndrome
Diagnostic Test: Mobility measurement with Periotest device · Diagnostic Test: Digital intraoral impression
Just finished orthodontic treatment, healthy gingiva, no smoking, non-pregnant, age:18-35, patients don't have bruxism and syndrome
Diagnostic Test: Mobility measurement with Periotest device · Diagnostic Test: Digital intraoral impression
T0 Mobility measurement with Periotest device after orthodontic treatment finished; before retainer simantation and after simantation. T1 Mobility measurement with Periotest device 6 months later; with retainer and without retainer.
T0 digital dental models will be taken with 3D scanner after orthodontic treatment finished; after retainer simantation. T1 digital dental models will be taken 6 months later with retainer. And Little irregularity index, arch length measurement will be performed.
Tooth mobility
Tooth mobility will be assessed using the Periotest device. The device will be applied to the buccal surface of the tooth, and the Periotest value (PTV) will be recorded according to the manufacturer's instructions. Higher PTV values indicate greater tooth mobility. Measurements will be recorded as Periotest values (PTV).
Time frame: From enrollment to the end of treatment at 6 months
Little irregularity
Anterior dental irregularity will be assessed using Little's Irregularity Index, measured as the sum of the five linear displacements between the anatomic contact points of the mandibular anterior teeth, in millimeters (mm). This assessment will be performed on digital intraoral models by using Orthomodel (Orthomodel, İstanbul, Türkiye) software.
Time frame: From enrollment to the end of treatment at 6 months
Arch length
Dental arch length will be assessed by measuring the linear distance from the midpoint between the central incisors to a line connecting the distal surfaces of the first permanent molars, in millimeters (mm). This assessment will be performed on digital intraoral models by using Orthomodel (Orthomodel, İstanbul, Türkiye) software.
Time frame: From enrollment to the end of treatment at 6 months
Plan to share: Undecided
This study is active, not recruiting, as verified in Jun 2026. You cannot join it, but the record below documents what was studied.
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Tooth Mobility