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Scribante A, Gallo S, Turcato B, et al. Fear of the Relapse: Effect of Composite Type on Adhesion Efficacy of Upper and Lower Orthodontic Fixed Retainers: In Vitro Investigation and Randomized Clinical Trial. Polymers (Basel). 2020;12(4)doi: 10.3390/polym12040963.
Scribante, A., Gallo, S., Turcato, B., Trovati, F., Gandini, P., & Sfondrini, M. F. (2020). Fear of the Relapse: Effect of Composite Type on Adhesion Efficacy of Upper and Lower Orthodontic Fixed Retainers: In Vitro Investigation and Randomized Clinical Trial. Polymers, 12(4), . https://doi.org/10.3390/polym12040963
Scribante, Andrea, et al. "Fear of the Relapse: Effect of Composite Type on Adhesion Efficacy of Upper and Lower Orthodontic Fixed Retainers: In Vitro Investigation and Randomized Clinical Trial." Polymers vol. 12,4 (2020). doi: https://doi.org/10.3390/polym12040963
Scribante A, Gallo S, Turcato B, Trovati F, Gandini P, Sfondrini MF. Fear of the Relapse: Effect of Composite Type on Adhesion Efficacy of Upper and Lower Orthodontic Fixed Retainers: In Vitro Investigation and Randomized Clinical Trial. Polymers (Basel). 2020 Apr 21;12(4). doi: 10.3390/polym12040963. PMID: 32326201; PMCID: PMC7240513.
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Polymers (Basel). 2020 Apr 21;12(4). doi: 10.3390/polym12040963.

Fear of the Relapse: Effect of Composite Type on Adhesion Efficacy of Upper and Lower Orthodontic Fixed Retainers: In Vitro Investigation and Randomized Clinical Trial.

Polymers

Andrea Scribante, Simone Gallo, Benedetta Turcato, Federico Trovati, Paola Gandini, Maria Francesca Sfondrini

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.

PMID: 32326201 PMCID: PMC7240513 DOI: 10.3390/polym12040963

Abstract

The aim of this laboratory and clinical study is to determine the reliability of the flowable nanocomposite Filtek Supreme XTE (FL) for the adhesion of orthodontic retainers, compared to highly filled orthodontic resin Transbond XT (XT). Portions of a round section multistranded wire (Ortosmail Krugg) were bonded to 40 bovine incisors with Scotchbond Universal in total-etch modality. For group one (XT, 20 samples), the orthodontic resin was used, whereas in group two (FL, 20 samples), the flowable one. Specimens were placed into a universal testing machine which applied a shear force on retainers with a crosshead speed of one/minute. Shear bond strength (SBS) and adhesive remnant index (ARI) scores were calculated. In the clinical trial, 100 patients requiring a canine-to-canine palatal and lingual retainer were randomly divided into two groups, according to the resin used for bonding procedure: the orthodontic in group one (XT, 50 participants) and the flowable in group two (FL, 50 participants). Monthly visits were carried out over a 24-month follow up to assess any detachment occurring on teeth of both arches. All data were submitted to statistical analysis. In vitro, FL reported a significant lower mean SBS, whereas no significant differences in ARI were reported between the two groups which both showed a major frequency of scores "1" and "2". At the end of the 24-month follow up, FL reported significantly higher failure rates in both arches besides a significantly lower survival rate starting from the sixth month after retainers bonding. According to the results assessed in vitro and clinically, XT would be preferable to FL when performing retainers bonding procedure.

Keywords: adhesion; bonding; clinical trial; fixed retention; flow; multistrand wire; nanocomposite; orthodontic composite; resin; retainer; shear; splint

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