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

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

Leonardo-Jiro-Nomura Nakano  1 , Guilherme-da Rocha-Scalzer Lopes  1 , Aline-Silva Firmino  2 , Jefferson-David-Melo de Matos  1 , Rubens-Nisie Tango  1 , Tarcisio-José-de Arruda Paes-Junior  1
Affiliations

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

Leonardo-Jiro-Nomura Nakano et al. J Clin Exp Dent. .

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.

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Conflict of interest statement

Conflicts of interest The authors declare that there are no conflicts of interest.

Figures

Figure 1
Figure 1
Specimen preparation. a) nylon base; b) nylon base positioned for surface treatment; c) teflon matrix; d) finished sample (nylon base + composite or acrylic resin).
Figure 2
Figure 2
Shear bond test. a) sample positioned for the shear bond test; b) sample after performing the test.
Figure 3
Figure 3
Stereomicroscopic image of the representative predominantly adhesive failure of the GAT specimen under 7.5x magnification (a), and the area delimited in red under 67x magnification (b); acrylic resin (red arrow).
Figure 4
Figure 4
Stereomicroscopic image of the representative predominantly adhesive failure of the GCT specimen under 7.5x magnification (a), and the area delimited in red under 67x magnification (b); composite resin (red arrow).
See this image and copyright information in PMC

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