Clinical evaluation of bond failures and survival between mandibular canine-to-canine retainers made of flexible spiral wire and fiber-reinforced composite

Abstract

Objectives: The purpose of this longitudinal prospective randomized study was to evaluate the clinical reliability of two different types of postorthodontic treatment retainers: a silanised-treated glass fibers-reinforced resin composite (FRC) and a directly bonded multistranded stainless steel wire. The hypothesis of the study was to assess if significant differences are present between failure rates of the two retainers. Study Design: This prospective study was based on an assessment of 87 patients (35 men and 52 women),with an average age of 24 years who required a lower arch fixed retainer after orthodontic treatment. Patients were divided in two groups. Assignment was carried out with random tables. A follow-up examination was carried out once a month. The number, cause, and date of single bond adhesive failures were recorded for both retainers over 12 months. Teeth that were rebonded after failure were not included in the success analysis. Statistical analysis was performed by means of a Fisher’s exact test, Kaplan-Meier survival estimates, and log rank test. Results: Bond failure rate was significantly higher (P=0.0392) for multistranded metallic wire than for FRC. Conclusions: Glass fiber-reinforced resin composite retainers and multistranded metallic wires showed no significant difference in single bond failure rates over a one-year follow up. Key words:Fiber reinforced composite, fixed retention, multistranded wire, orthodontics, retainer, splint.

Failure of fixed orthodontic retainers: A systematic review

“…A greater failure risk was observed in the upper jaw, a finding that may be attributed to the occlusion contacts obtained with the antagonists. Glass fibre retainers treated with silane primers resulted in the lowest failures, 19,47 apparently due to enhanced bonding at the glassresin interface mediated by the silane. As far as the multistranded retainers are concerned, failures in the upper jaw ranged from 10.9% 35 up to 48.2%, 35 whereas in the lower jaw failures extended from 5.9% 35 up to 57.4% 47 when using round wires.…”

“…For example, it is interesting to note that glass-fibre reinforced retainers have significantly lower bond failures in the study of Bolla et al 19 and Sfondrini et al 47 were silanisation before bonding was implemented. Thus the need of silanisation in order to strengthen the resin/fibre interface could be an important bond failure predictor in this type of retainers.…”

“…Thus, these studies were classified at unclear risk of bias. In the last four studies, 18,19,25,47 High j o u r n a l o f d e n t i s t r y x x x ( 2 0 1 5 ) x x x -x x x of participants, therapists or outcome assessors. Based on the aforementioned points, those studies were rated at high risk of bias.…”

Fear of the Relapse: Effect of Composite Type on Adhesion Efficacy of Upper and Lower Orthodontic Fixed Retainers: In Vitro Investigation and Randomized Clinical Trial

“…The results achieved through an orthodontic treatment might unfortunately not be stable considering the potentiality of teeth to recover the previous position [31]. Therefore, retention is essential whether the patient desires to maintain the effects achieved, and with this purpose, fixed retainers have gained importance in relapse prevention [32,33].…”

Influence of fluoride releasing light cured resin coat on enamel mineralization and survival of metallic brackets in orthodontic patients: A 12-months

“…No statistically significant differences in failure rates between chemically cured composite and light cured composites have been shown [9,10] . On the other hand, chemical cure glass ionomer cement has showed higher failure rates, as compared to chemically cured composite [11] .…”