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Int. J. Mol. Sci. 2017, 18(10), 2096; doi:10.3390/ijms18102096

Spot-Bonding and Full-Bonding Techniques for Fiber Reinforced Composite (FRC) and Metallic Retainers

1
Unit of Orthodontics and Paediatric Dentistry, Section of Dentistry, Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, 27100 Pavia, Italy
2
Department of Biomaterial Science and Turku Clinical Biomaterials Centre—TCBC, Institute of Dentistry, University of Turku, 20100 Turku, Finland
3
Welfare Division, 20100 Turku, Finland
*
Author to whom correspondence should be addressed.
Received: 19 September 2017 / Revised: 1 October 2017 / Accepted: 2 October 2017 / Published: 4 October 2017
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Abstract

Fiber reinforced Composite (FRC) retainers have been introduced as an aesthetic alternative to conventional metallic splints, but present high rigidity. The purpose of the present investigation was to evaluate bending and fracture loads of FRC splints bonded with conventional full-coverage of the FRC with a composite compared with an experimental bonding technique with a partial (spot-) resin composite cover. Stainless steel rectangular flat, stainless steel round, and FRC retainers were tested at 0.2 and 0.3 mm deflections and at a maximum load. Both at 0.2 and 0.3 mm deflections, the lowest load required to bend the retainer was recorded for spot-bonded stainless steel flat and round wires and for spot-bonded FRCs, and no significant differences were identified among them. Higher force levels were reported for full-bonded metallic flat and round splints and the highest loads were recorded for full-bonded FRCs. At the maximum load, no significant differences were reported among spot- and full-bonded metallic splints and spot-bonded FRCs. The highest loads were reported for full bonded FRCs. The significant decrease in the rigidity of spot-bonded FRC splints if compared with full-bonded retainers suggests further tests in order to propose this technique for clinical use, as they allow physiologic tooth movement, thus presumably reducing the risk of ankylosis. View Full-Text
Keywords: dentistry; orthodontics; prosthodontics; fiber reinforced composite; FRCs; three-point bending; bend; strength dentistry; orthodontics; prosthodontics; fiber reinforced composite; FRCs; three-point bending; bend; strength
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Scribante, A.; Gandini, P.; Tessera, P.; Vallittu, P.K.; Lassila, L.; Sfondrini, M.F. Spot-Bonding and Full-Bonding Techniques for Fiber Reinforced Composite (FRC) and Metallic Retainers. Int. J. Mol. Sci. 2017, 18, 2096.

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