A comparative assessment of failures and periodontal health between 2 mandibular lingual retainers in orthodontic patients. A 2-year follow-up, single practice-based randomized trial

•Orthodontists use rectangular wire retainers to prevent the development of active retainers.•This trial compares survival round twisted vs braided after 2 years.•Both retainer types showed comparable rates.•Periodontal health was good in patients wearing both types. IntroductionThe objective this study compare rates and periodontal with 3-strand (RT) 8-strand (RB) fixed bonded all 6 anterior teeth mandible.MethodsA total 133 completing orthodontic treatment (median age, 24.6 years; 25th percentile, 17.2 75th 32.4 minimum, 15.1 maximum, 49.8 years) were randomly allocated a 1:1 ratio receive either an RT or RB retainer. Inclusion criteria mandibular permanent incisors canines present, no caries, restorations, fractures on canines, disease. Patients poor oral hygiene before debonding excluded from trial. The primary outcome any first-time failure. Secondary outcomes index, bleeding probing, plaque gingival probing depth. Randomization accomplished random permuted blocks size 4, 6, 8 allocation concealed sequentially numbered, opaque, sealed envelopes. Blinding not possible evaluated at baseline, 3, 12, 18, 24 months placement Retainer assessed using Cox regression. Periodontal parameters reported each time point generalised estimating equations used assess effect treatment, time, tooth X interaction indices.ResultsBaseline characteristics similar between groups; 1 patient, intervention discontinued. During 2-year follow-up 37 66 (56.1%, group) 32 (48.5%, failed least once (log-rank test, P = 0.55). adjusted hazard 0.69 (95% confidence interval, 0.42-1.12; 0.13). Neither age nor gender predictor All (periodontal pocket depth) groups remained relatively stable during follow-up.ConclusionsThe overall risk for failure high amounted 52.3% (56.1% group 48.5% group). There difference terms examined retainers. mandible. A indices. Baseline follow-up.