Analysis of bond strength between a nylon reinforcement structure and dental resins

Leonardo-Jiro-Nomura Nakano; Guilherme-da Rocha-Scalzer Lopes; Aline-Silva Firmino; Jefferson-David-Melo de Matos; Rubens-Nisie Tango; Tarcisio-José-de Arruda Paes-Junior

doi:10.4317/jced.57654

Analysis of bond strength between a nylon reinforcement structure and dental resins

J Clin Exp Dent. 2021 May 1;13(5):e505-e510. doi: 10.4317/jced.57654. eCollection 2021 May.

Authors

Leonardo-Jiro-Nomura Nakano¹, Guilherme-da Rocha-Scalzer Lopes¹, Aline-Silva Firmino², Jefferson-David-Melo de Matos¹, Rubens-Nisie Tango¹, Tarcisio-José-de Arruda Paes-Junior¹

Affiliations

¹ Department of Prosthodontics and Dental Materials, São Paulo State University (Unesp) - Institute of Science and Technology, São José dos Campos - SP, Brazil.
² Department of Dentistry, Universidade São Francisco UFS, Bragança Paulista - SP, Brazil.

Abstract

Background: Nylon is a polymer that its use to reinforce dental resins has shown positive results such as increased flexural strength. The aim of this study was to evaluate the bond strength between dental resins and a nylon reinforcement.

Material and methods: Forty cylindrical nylon blocks with 13 x 23 mm with 0.5% by volume of silica and 40 without were made. Half of the samples of each nylon composition were sandblasted with aluminum oxide (50μm) for 3 s (2.8 bar pressure, distance: 20 mm, incidence angle: 90o). On the nylon blocks, cylinders of chemically activated acrylic resin and indirect composite resin were made, with a bonding area of 6,28 mm2. Eight different groups were obtained according to the material used and the surface treatment (n = 10): Acrylic Resin + Nylon; GAS: Acrylic Resin + Nylon with Silica; GAT: Acrylic Resin + Nylon (Al2O3); GAST: Acrylic Resin + Nylon with Silica (Al2O3); GC: Composite Resin + Nylon; GCS: Composite Resin + Nylon with Silica; GCT: Composite Resin + Nylon (Al2O3); GCST: Composite Resin + Nylon with Silica (Al2O3). The shear test was carried out. The Student's and the Kruskal-Wallis test was adopted.

Results: There was no statistically difference in the bond strength for nylon with silica for the acrylic resin group. For the composite groups, nylon with silica did not present a statistically difference without surface treatment (p = 0.10) and with surface treatment the bond strength decreased (p = 0.000). The GCT showed a higher bond strength (0.89 MPa). The surface treatment improved the bond strength for the both groups.

Conclusions: The presence of silica in the nylon composition did not influence the bond strength between materials evaluated. However, the surface treatment with aluminum oxide proved to be favorable for this adhesion. Key words:Nylons - Resins, Synthetic - Structures Strengthening - Dental Research.