Advances in Clinical and Experimental Medicine

Title abbreviation: Adv Clin Exp Med
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ISSN 1899–5276 (print)
ISSN 2451-2680 (online)
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Advances in Clinical and Experimental Medicine

2020, vol. 29, nr 9, September, p. 1111–1116

doi: 10.17219/acem/125426

Publication type: original article

Language: English

License: Creative Commons Attribution 3.0 Unported (CC BY 3.0)

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The three-point bending test of fiber-reinforced composite root canal posts

Michał Biały1,A,B,D,F, Agnieszka Szust2,C,E,F, Piotr Napadłek1,B,E,F, Maciej Dobrzyński3,B,E,F, Włodzimierz Więckiewicz1,A,E,F

1 Department of Dental Prosthetics, Wroclaw Medical University, Poland

2 Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Poland

3 Department of Conservative Dentistry and Pedodontics, Wroclaw Medical University, Poland

Abstract

Background. The primary reason for using a post is to retain the core with the objective to restore the missing coronal tooth structure. To achieve optimum results, the materials that are used to restore endodontically treated teeth should have physical and mechanical properties that are similar to that of dentin.
Objectives. To characterize the strength parameters of fiber-reinforced composite (FRC) posts with the application of a three-point test. The mean fracture load, flexural strength and flexural modulus were taken into consideration.
Material and Methods. For the three-point strength tests, 5 kinds of fiberglass root-posts were used: GC Fiber Post (GC America, Alsip, USA), Mirafit White (Hager Werken, Duisburg, Germany), Innopost (InnoTech, Verona, Italy), Rebilda Post (Voco, Cuxhaven, Germany), and EverStick Post (GC Europe, Leuven, Belgium). For each system, 15 FRC posts were tested. All posts had the same diameter, length and shape. The three-point test was carried out in accordance with ISO 10477:2004, using the Instron-5944 testing machine (Instron, Norwood, USA). The test was carried out until the sample was broken.
Results. The highest force values (67.6 N) were recorded for the GC posts, and the lowest force required to break the sample (29.6 N) was noted for the EverStick Posts. In the case of bending strength, the highest values were also recorded for GC posts (912.4 MPa). Low bending strengths were obtained for the Mirafit White posts (537.2 MPa); however, the EverStick Posts were the weakest (436.2 MPa). Rebilda posts showed the highest modulus of elasticity – 31.1 GPa. The lowest values of the elastic modulus were registered for EverStick Posts – 12.5 GPa.
Conclusion. There were statistically significant differences in fracture loads, flexural strengths and flexural modulus of the FRC-post systems tested. Individually polymerized FRC material showed lower flexural properties than compared prefabricated FRC posts.

Key words

three-point bending test, flexural modulus, flexural strength, fiber-reinforced composite post, individually formed post

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