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.
Highlights
In the last few years fiber-reinforced resin composite (FRC) has been introduced to dental practice
In vivo-vitro studies suggested that glass fiber-reinforced composite may be used for fixed lingual retention of the anterior segment after orthodontic treatment [3,4,5,6,7,8]
The aim of this randomized study is to compare the clinical reliability of a resin composite retainer reinforced with glass fibers with a multistranded stainless steel wire, analyzing the number and the time of detachments during one year follow-up period
Summary
In the last few years fiber-reinforced resin composite (FRC) has been introduced to dental practice. Among advantages of fiber-reinforced resin composite can be considered its high biocompatibility [7]: FRCs are metal-free and indicated for patients allergic to metals or in subjects screened by Nuclear Magnetic Resonance (RMN). Another important property is aesthetics: fibers are barely invisible and don’t affect the teeth-translucence [6]. Only few controlled clinical follow-up studies based on comparison of a flexible spiral wire and a direct bonded glass fiber-reinforced resin composite are present. The aim of this randomized study is to compare the clinical reliability of a resin composite retainer reinforced with glass fibers with a multistranded stainless steel wire, analyzing the number and the time of detachments during one year follow-up period
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