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. 2017:2017:8469090.
doi: 10.1155/2017/8469090. Epub 2017 Oct 10.

Bending Properties of Fiber-Reinforced Composites Retainers Bonded with Spot-Composite Coverage

Maria Francesca Sfondrini  1 , Paola Gandini  1 , Paola Tessera  1 , Pekka K Vallittu  2   3 , Lippo Lassila  2 , Andrea Scribante  1
Affiliations

Bending Properties of Fiber-Reinforced Composites Retainers Bonded with Spot-Composite Coverage

Maria Francesca Sfondrini et al. Biomed Res Int. 2017.

Abstract

Orthodontic and periodontal splints are prepared with round or flat metallic wires. As these devices cannot be used in patients with allergy to metals or with aesthetic demands, fiber-reinforced composite (FRC) retainers have been introduced. Stiffness of FRC materials could reduce physiologic tooth movement. In order to lower rigidity of conventional FRC retainers, a modified construction technique that provided a partial (spot) composite coverage of the fiber has been tested and compared with metallic splints and full-bonded FRCs. Flat (Bond-a-Braid, Reliance Orthodontic Products) and round (Penta-one 0155, Masel Orthodontics) stainless steel splints, conventional FRC splints, and experimental spot-bonded FRC retainers (Everstick Ortho, StickTech) were investigated. The strength to bend the retainers at 0.1 mm deflection and at maximum load was measured with a modified Frasaco model. No significant differences were reported among load values of stainless steel wires and experimental spot-bonded FRC retainers at 0.1 mm deflection. Higher strength values were recoded for conventional full-bonded FRCs. At maximum load no significant differences were reported between metallic splints (flat and round) and experimental spot-bonded FRCs, and no significant differences were reported between spot- and full-bonded FRC splints. These results encourage further tests in order to evaluate clinical applications of experimental spot-bonded FRC retainers.

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Figures

Figure 1
Figure 1
Flat metallic splint (a) round metallic splint (b) experimental spot-bonded FRC (c) and conventional full-bonded FRC (d).
Figure 2
Figure 2
Box plot of strength values (N) of the various groups tested at 0.1 mm deflection.
Figure 3
Figure 3
Box plot of strength values (N) of the various groups tested at maximum load.
See this image and copyright information in PMC

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