Flexural strength of milled polymer bars, with and without glass fiber reinforcement





Dental materials; Flexural strength; Biomaterials.


The aim of this study is to test and compare the flexural strength of milled polymer bars, with and without glass fiber reinforcement. The number of samples in the study was defined through a pilot study on a universal testing machine (EMIC) (n = 5). The brands analyzed in this study were Arch Free Metal, Zantex, Bioplas and PEEK. All samples were submitted to thermal aging before the three-point flexural test. Fracture patterns were analyzed using a Scanning Electron Microscope. Results show that the Arch Free Metal bar presented the largest flexural strength, followed by Zantex and PEEK bars, that lacked statistical difference, and Bioplas bars. Regarding fracture patterns, Arch Free Metal and Zantex bars were partially fractured and showed partial glass fiber rupture; PEEK bars were not fractured and showed plastic behavior; and Bioplas bars were fractured. It is possible to conclude that the reinforced polymer bar Arch Free Metal has a better performance in terms of flexural strength than the other tested materials. 


Aquino, M. M. O., et al. (2018). Cantilever Protocol Bars in Acrylated Polyetheretherketone (Peek): A Mechanical Compression Assay. Oral Health and Dental Management, 17 (2), 1-4.

Anzolin, D., et al. (2019). Biomechanical behavior of an implant system of carbon fiber-reinforced polyether ether ketone (PEEK) bars with different designs: finite elements analysis. InterAmerican Journal of Medicine and Health, 2 (1): e201901003-e201901003.

Ávila, G. B., et al. (2019). Analysis of Mechanical Behavior of Protocol-Type Prosthesis Produced in Modified Polymers with Carbon Nanotubes. Oral Health and Dental Management, 18, 1-8.

Bae, J. M., et al. (2001). The Flexural Properties of Fiber-Reinforced Composite with Light-Polymerized Polymer Matrix. Int J Prosthodont. 14(1), 33-9.

Bergamo, E. T. P., et al. (2021). Physicochemical and mechanical characterization of a fiber-reinforced composite used as frameworks of implant-supported prosthese. Elsevier. 37 (8), 443-453.

Carvalho, G. A. P., et al. (2017). Polyether ether ketone in protocol bars: Mechanical behavior of three designs. J Inter Oral Health. 9(5), 202.

Fajardo, R. S., et al. (2011). The effect of E-glass fibers and acrylic resin thickness on fracture load in a simulated implant-supported overdenture prosthesis. J Prosthet Dent. 106(6), 373-7.

Franco, A. B. G., et al. (2022). The biomechanics of the bone and of metal, Zantex and PEEK bars in normal and osteoporotic condition, surrounding implants over protocols: an analysis by the Finite Element Method. Research Society and Development, 11, e59111226183.

Grecco, P., et al. (2022). Análisis de la resistencia adhesiva de postes de fibra de vidrio sometidos al ensayo mecánico de cizallamiento por extrusión en diferentes protocolos de cementación. Research Society and Development, 11, e25211427344.

Gumbau, G. C., et al. (2019). All-on-4 with tapered neck implants and a hybrid prosthesis with a fiberglass-reinforced structure. J Oral Science Rehabilitation. 5(3), 16-23.

Guzmán, P. C., et al. (2008). Influence of different cantilever extensions and glass or polyaramid reinforcement fibers on fracture strength of implant-supported temporary fixed prosthesis.J Appl Oral Sci. 16(2), 111-5.

Jaros, O. A. L., et al. (2018). Comportamento biomecânico de um sistema de implante usandobarra de poliéter éter cetona: análise de elementos finitos. J Int Soc Prev Community Dent. 8 (5), 446-450.

Martino, N., et al. (2019). Retrospective analysis of survival rates of post-and-cores in a dental school setting. J Prosthet Dent, 23(3), 434-44.

Menini, M., et al. (2015). Effect of Framework in na Implant-Supported Full-Arch Fixed Prosthesis: 3D Finite Element Analysis. Int J Prosthodont. 28(6), 627-30.

Peçanha, A. P. B., et al. (2021). Analysis of In-vivo Cytotoxicity and Irritability of an Epoxy Nanocomposite. Surgery: Current Research, 11, 115.

Silva Júnior, E. V., et al. (2018). Analysis of linear dimensional change of different materials used for casting dental models: plaster type 4, nanocomposites carbon nanostructures, polyurethane resin and epoxy resin. Journal of Dental Health, Oral Disorders & Therapy, 9, 200-205.

Schwitalla, A., et al. (2013). PEEK Dental Implants: A Review of the Literature. Journal of Oral Implantology. 39(6), 743-9.

Tacir, I. H., et al. (2006). Flexural properties of glass fibre reinforced acrylic resin polymers. Aust Dent J. 51(1), 52-6.

Yasue, T., et al. (2019). Effect of fiberglass orientation on flexural properties of fiberglass-reinforced composite resin block for CAD/CAM. Dent Mater J. 38(5), 738-42.

Yilmaz, B., et al. (2018). Failure analysis of high performance polymers and newgeneration cubic zirconia used for implant-supported fixed, cantilevered prostheses. Clin Implant Dent Relat Res, 1-8.




How to Cite

BURGUER NETO, R.; FRANCO, A. G. .; CARVALHO, G. A. P. de .; MARTINS, C. M. .; MECCA JUNIOR, S.; PEREZ, F.; RAMOS, E. V. .; DIAS, S. C. .; FRANCO, A. B. G. . Flexural strength of milled polymer bars, with and without glass fiber reinforcement . Research, Society and Development, [S. l.], v. 11, n. 7, p. e2711729626, 2022. DOI: 10.33448/rsd-v11i7.29626. Disponível em: https://rsdjournal.org/index.php/rsd/article/view/29626. Acesso em: 6 jul. 2022.



Health Sciences