Effects of polishing on surface roughness and hardness of glass-fiber-reinforced polypropylene

The main objective of the presented scientific article is to define the mechanical properties of polypropylene homopolymer with a prescribed percentage ratio of recycled granulate. The chosen material is intended for injection molding and especially for the production of products made by additive technologies. Experimental verification of the mechanical properties was realized by testing samples produced with various concentrations of the recycled material. Experimental samples underwent tests to obtain the mechanical properties of the produced new material. These tests included rheological tests, tensile and flexural tests as well as and Charpy impact toughness tests. These mechanical tests were conducted according to ISO standards valid for the individual testing method. Testing methods were carried out using prescribed numbers of testing samples. The presented scientific article is also focused on changes in microstructures of testing materials in relation to the percentage ratio of recycled granulate. Recycled granulate of thermoplastic was not necessity for additional modifications.

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“…3) to 67.27 for 100% regranulate. The results also confirm the conclusions of Tanimoto and Nagakura [26] and Manas et al [27].…”

Section: Evaluation Of the Hardness Propertiessupporting

confidence: 90%

Implementation of a Recycled Polypropylene Homopolymer Material for Use in Additive Manufacturing

et al. 2021

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“…[ 28 29 ] In the oral environment, the thermoplastic resin, when compared with the acrylic one, becomes more roughed, favoring biofilm accumulation as well as absorbing more fluids, which makes the material more prone to staining. [ 27 ] In vitro studies have been performed to evaluate the color stability[ 5 28 29 30 31 ] and the roughness[ 27 31 32 33 ] of thermoplastic materials for NMCDs. The staining of the thermoplastic resin in the buccal environment should be considered by the possible interference with the esthetics of NMCDs, which is one of the most relevant characteristics.…”

Section: Literature Reviewmentioning

confidence: 99%

Nonmetal clasp dentures: What is the evidence about their use?

Mendoza-Carrasco

Hotta

Sugio

et al. 2020

J Indian Prosthodont Soc

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The aim was to discuss the indications, contraindications, advantages, and disadvantages of Nonmetal clasp dentures (NMCDs), as well as the most relevant properties of its constituent materials. A search was conducted using the keywords: “nonmetal clasp dentures,” “thermoplastic resin,” “flexible resin removable partial denture,” “polyamide,” and “nylon” in databases PubMed/Medline, Lilacs, SciELO, and textbooks between 1955 and 2020. Theses and texts without reliable sources of publication were excluded. Once the analysis instruments were determined, the data were analyzed and discussed. NMCDs present high flexibility, easy adaptation to the abutments, color compatibility and biocompatibility with the oral mucosa, and absence of visible metal clasps. However, they need laboratory relining, grinding, and polishing, do not have criteria for its planning, become rougher and stained over time, and are able to traumatize supporting tissues. The association with metal components seems to be an alternative to increase the success of NMCDs by combining esthetics and biomechanical principles of conventional removable partial dentures. The lack of long-term clinical studies makes the professionals to rely solely on previous experiences or on the manufacturers' recommendations. It suggested that NMCDs must be indicated with caution when not used temporarily.

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“…This removes the need to observe indentations on the specimen surface with an optical microscope. The degree of total deformation including plastic deformation and elastic deformation can then be measured, which allows the mechanical parameters of dynamic hardness and elastic modulus to be computed 18) . Hence, the dynamic micro-indentation method is an effective method for evaluating mechanical properties of bulk-fill flowable resin composites.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the mechanical behavior of bulk-fill and conventional flowable resin composites using dynamic micro-indentation

et al. 2022

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The purpose of this research was to investigate the mechanical behavior of commercially available bulk-fill and conventional flowable resin composites using the dynamic micro-indentation method. The effect of inorganic filler content on mechanical properties was also assessed. Weight percentages of the inorganic filler in the resin composite were measured using the ashing technique. The results showed that dynamic hardness and elastic modulus tended to increase with inorganic filler content. Furthermore, the differences in mechanical properties between top and bottom surfaces were less pronounced in bulk-fill flowable resin composites compared with conventional flowable resin composites. In conclusion, the mechanical properties of bulk-fill flowable resin composites are affected by filler content. Moreover, bulk-fill flowable resin composites have a higher polymerization depth than conventional flowable resin composites when sample thickness is 4 mm.

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Effects of polishing on surface roughness and hardness of glass-fiber-reinforced polypropylene

Cited by 6 publications

References 20 publications

Implementation of a Recycled Polypropylene Homopolymer Material for Use in Additive Manufacturing

Implementation of a Recycled Polypropylene Homopolymer Material for Use in Additive Manufacturing

Nonmetal clasp dentures: What is the evidence about their use?

Evaluation of the mechanical behavior of bulk-fill and conventional flowable resin composites using dynamic micro-indentation

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