“Clinical comparison of bond failure rate between two types of mandibular canine-canine bonded orthodontic retainers- a randomized clinical trial”

Abstract

Background: Bonded retainers are widely used as they are esthetically pleasing, easily acceptable, provide greater stability, compliance free and causes no soft tissue irritation and speech problems. Though, fracture and bond failure are their shortcomings. Therefore, the objectives of this study were to evaluate the number of bond failures and type of failure pattern between two types of mandibular canine-canine bonded retainers. Methods: Total 60 subjects were recruited initially and were assessed for eligibility, out of which 6 were excluded and 2 were lost to follow up. They were randomly divided into two groups. Fiber reinforced composite (FRC) retainers were inserted in group 1 subjects while group 2 subjects received multistranded stainless steel (MSW) retainers. The subjects were recalled after every 3 months over a period of 1 year. Bond failure rate and failure pattern based on adhesive remnant index were evaluated at each visit. The bond failure rate and failure pattern were compared between the two retainers by using Chi-square test. Results: The bond failure rates were 42.94% for FRC retainer and 31.41% for MSW retainer. Hence, total number of bond failures in both retainers were 37.17%. The difference of bond failure between two groups was statistically significant (p = 0.012). Type "0" failure pattern was detected commonly with both types of retainers (p < 0.001). Conclusion: Our findings indicate that multistranded stainless steel wire retainer is a superior option to be used for fixed lingual retention in mandibular arch as it exhibited lower bond failure as compared to fiber reinforced composite retainer. Adhesive failure is the most common type of bond failure observed with both types of fixed retainers. Trial registration: ID NCT03881813 (https://clinicaltrials.gov/); March 19, 2019, retrospective registration.

What causes failure of fixed orthodontic retention? – systematic review and meta-analysis of clinical studies

“…No significant differences in plaque nor calculus accumulation were found between the wires.The smallest differences in the mandibular irregularity index were observed in patients with thin spiral wire bonded to all teeth, and the largest in patients with thick plain wire bonded only to canines and in patients with removable retainers. Nagani et al 2020 [ 28 ] RCT Comparison of failure rate and evaluation of failure pattern in 2 types of mandibular canine-canine bonded retainers. 52 patients (8 W, 44 M), 26 patients per group The adhesion to single dental element was considered separately Fiber reinforced composite retainers (INOD, U.P.…”

“…Concerning bonding failures statistically significant differences concerning failure rates, discoloration and calculus accumulation [ 29 ] have been reported between retainers bonded with additional use of a bonding agent versus retainers bonded with a composite material only [ 29 , 36 ]. Adhesive failure (with no retained composite material on enamel surface) is the most common type of bond failure observed in fixed lingual retainers [ 28 , 42 ] Concerning the stability of dental alignment, irregularity index increases with time despite the presence of bonded retainers [ 25 , 27 , 41 ]. No difference has been confirmed as far as type of wire and splint was concerned.…”

Bond Strength and Deflection of Four Types of Bonded Lingual Retainers

“…Bearn [ 23 ] suggested that the retainer wires should preferably have low thickness and multiple braided strands. Nagani [ 24 ] reported lower failure rate of multistrand retainers compared with reinforced retainers. Also, multistrand retainers have less adverse effects on the periodontal tissue (such as inflammation or gingival recession) and lower risk of caries [ 25 ].…”

The new retainers in Dento-Facial Orthopedics

“…L'avantage de cette technique est son faible coût et sa réalisation aisée en cabinet si la structure et l'équipement le permettent. Plusieurs auteurs 14,17,18,21 ont analysé et comparé les attelles en résine renforcées par des fibres, qui sont des alternatives fiables aux fils métalliques collés lorsqu'elles sont parfaitement réalisées et collées, mais il n'existe pour le moment aucune étude concernant les attelles imprimées en 3D ou usinées, leur tenue dans le temps n'est pas encore évaluée et il y a peu de recul sur cette technique toutefois prometteuse. Il faudra également évaluer la mobilité physiologique permise par ce système, qui est bien plus rigide qu'un fil métallique collé, sans toutefois avoir la rigidité d'une attelle métallique.…”