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