Korean J Orthod.  2018 Mar;48(2):107-112. 10.4041/kjod.2018.48.2.107.

Comparison between fiber-reinforced polymers and stainless steel orthodontic retainers

Affiliations
  • 1Department of Orthodontics, Vita Salute San Raffaele University, Milano, Italy. lucchese.alessandra@hsr.it
  • 2Unit of Dentistry, Division of Orthodontics, Research Area in Dentofacial Orthopedics and Orthodontics, IRCCS San Raffaele Scientific Institute, Milano, Italy.
  • 3Unit of Dentistry, Vita Salute San Raffaele University, Milano, Italy.
  • 4Research Area in Oral Pathology and Implantology, IRCCS San Raffaele Hospital, Milan, Italy.
  • 5Department of Orthodontics, Seconda Università degli Studi di Napoli, Caserta, Italy.

Abstract


OBJECTIVE
The aim of this study was to examine the properties of fiber-reinforced composite and stainless steel twisted retainers for orthodontic retention.
METHODS
Three different span lengths (5.0, 8.0, and 14.0 mm) of fiber-reinforced composite were investigated. The three fiber-reinforced composite retainer groups were subdivided according to the storage condition (dry and wet), resulting in a total of six groups. Each stainless steel and fiber-reinforced composite group was comprised of six specimens. The three-point bending flexural test was conducted using a universal testing machine. ANOVA was used to assess differences in the maximum load and maximum stress according to the span length, material, and storage condition. Post-hoc comparisons were performed if necessary.
RESULTS
The maximum stress and maximum load were significantly (p < 0.001) associated with the span length, material, and storage condition. The significant interaction between the material and span length (p < 0.001) indicated the differential effects of the material for each span length on the maximum stress and maximum load, with the difference between materials being the highest for the maximum span length.
CONCLUSIONS
Our findings suggest that fiber-reinforced composite retainers may be an effective alternative for orthodontic retention in patients with esthetic concerns or allergy to conventional stainless steel wires.

Keyword

Orthodontic materials; Orthodontic retainers; Fiber-reinforced composite

MeSH Terms

Humans
Hypersensitivity
Orthodontic Retainers*
Polymers*
Stainless Steel*
Polymers
Stainless Steel

Figure

  • Figure 1 Water absorption after immersion of fiber-reinforced composite retainers (OrthoStick) in distilled water at 37℃.

  • Figure 2 Load-deflection curves generated on the basis of a three-point bending flexural test for different span lengths of multistrand stainless steel (SS) and fiber-reinforced composite (FRC) retainers stored under dry and wet conditions. A, 5 mm; B, 8 mm; C, 14 mm.


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