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Sfondrini MF, Vallittu PK, Lassila LVJ, et al. Glass Fiber Reinforced Composite Orthodontic Retainer: In Vitro Effect of Tooth Brushing on the Surface Wear and Mechanical Properties. Materials (Basel). 2020;13(5)doi: 10.3390/ma13051028.
Sfondrini, M. F., Vallittu, P. K., Lassila, L. V. J., Viola, A., Gandini, P., & Scribante, A. (2020). Glass Fiber Reinforced Composite Orthodontic Retainer: In Vitro Effect of Tooth Brushing on the Surface Wear and Mechanical Properties. Materials (Basel, Switzerland), 13(5), . https://doi.org/10.3390/ma13051028
Sfondrini, Maria Francesca, et al. "Glass Fiber Reinforced Composite Orthodontic Retainer: In Vitro Effect of Tooth Brushing on the Surface Wear and Mechanical Properties." Materials (Basel, Switzerland) vol. 13,5 (2020). doi: https://doi.org/10.3390/ma13051028
Sfondrini MF, Vallittu PK, Lassila LVJ, Viola A, Gandini P, Scribante A. Glass Fiber Reinforced Composite Orthodontic Retainer: In Vitro Effect of Tooth Brushing on the Surface Wear and Mechanical Properties. Materials (Basel). 2020 Feb 25;13(5). doi: 10.3390/ma13051028. PMID: 32106404; PMCID: PMC7084318.
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Materials (Basel). 2020 Feb 25;13(5). doi: 10.3390/ma13051028.

Glass Fiber Reinforced Composite Orthodontic Retainer: In Vitro Effect of Tooth Brushing on the Surface Wear and Mechanical Properties.

Materials (Basel, Switzerland)

Maria Francesca Sfondrini, Pekka Kalevi Vallittu, Lippo Veli Juhana Lassila, Annalisa Viola, Paola Gandini, Andrea Scribante

Affiliations

  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.

PMID: 32106404 PMCID: PMC7084318 DOI: 10.3390/ma13051028

Abstract

Fiber reinforced composites (FRCs) are metal free materials that have many applications in dentistry. In clinical orthodontics, they are used as retainers after active treatment in order to avoid relapse. However, although the modulus of the elasticity of FRCs is low, the rigidity of the material in the form of a relatively thick retainer with a surface cover of a flowable resin composite is known to have higher structural rigidity than stainless steel splints. The aim of the present study is to measure load and bending stress of stainless steel wires, as well as flowable resin composite covered and spot‑bonded FRC retainer materials after tooth brushing. These materials were tested with a three point bending test for three different conditions: no brushing, 26 min of brushing, and 60 min of brushing. SEM images were taken before and after different times of tooth brushing. Results showed that stainless steel was not significantly affected by tooth brushing. On the other hand, a significant reduction of values at maximum load at fracture was reported for both FRC groups, and uncovered FRCs were most affected. Concerning maximum bending stress, no significant reduction by pretreatment conditions was reported for the materials tested. SEM images showed no evident wear for stainless steel. Flowable resin composite covered FRCs showed some signs of composite wear, whereas spot‑bonded FRCs, i.e., without the surface cover of a flowable resin composite, showed signs of wear on the FRC and exposed glass fibers from the FRC's polymer matrix. Because of the significant changes of the reduction of maximum load values and the wear for spot‑bonded FRCs, this technique needs further in vitro and in vivo tests before it can be performed routinely in clinical practice.

Keywords: FRC; bonding; brushing; composite; deflection; fiber; load; mechanical; orthodontics; reinforced; retainer; splint; spot; technique; wear

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