Comparative Analysis of Water Sorption by Different Acrylic Materials

Kostić, Milena; Petrović, Milica; Krunić, Nebojša; Igić, Marko; Janosevic, Predrag

doi:10.5633/amm.2014.0201

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…The study of the polymerization curve is necessary to establish the right amount of organic filler that can be introduced in the formulation to replace ATH, avoiding modifications in the exothermic curve compared to that of Duralight ® . In fact, a lower temperature peak and/or a delay result in an incomplete reaction in the material and, as a consequence, the presence of a higher porosity and therefore possibly higher absorption of liquids and lower physical and mechanical properties, which is well known on PMMA [ 19 , 20 ]. From the temperature vs. time curves reported in Figure 1 the following evidences can be outlined: Keeping constant the catalysts amount, the comparison of the rice husk exothermic peaks with the standard Duralight ® , makes visible that the reactivity peak obtained with 5 and 10% of rice husk is located in the reactivity range of Duralight ® .…”

Section: Resultsmentioning

confidence: 99%

Use of Almond Shells and Rice Husk as Fillers of Poly(Methyl Methacrylate) (PMMA) Composites

Sabbatini

Lanari²,

Santulli

et al. 2017

Materials

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In recent years, wood fibres have often been applied as the reinforcement of thermoplastic materials, such as polypropylene, whereas their use in combination with thermosetting resin has been less widespread. This study concerns the production of PMMA-based composites by partly replacing alumina trihydrate (ATH) with wood waste fillers, namely rice husks and almond shells, which would otherwise be disposed by incineration. The amount of filler introduced was limited to 10% as regards rice husks and 10 or 15% almond shells, since indications provided by reactivity tests and viscosity measurements did not suggest the feasibility of total replacement of ATH. As a matter of fact, the introduction of these contents of wood waste filler in PMMA-based composite did not result in any significant deterioration of its mechanical properties (Charpy impact, Rockwell M hardness and flexural performance). Some reduction of these properties was only observed in the case of introduction of 15% almond shells. A further issue concerned the yellowing of the organic filler under exposure to UV light. On the other hand, a very limited amount of water was absorbed, never exceeding values around 0.6%, despite the significant porosity revealed by the filler’s microscopic evaluation. These results are particularly interesting in view of the application envisaged for these composites, i.e., wood replacement boards.

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Section: Resultsmentioning

confidence: 99%

Use of Almond Shells and Rice Husk as Fillers of Poly(Methyl Methacrylate) (PMMA) Composites

Sabbatini

Lanari²,

Santulli

et al. 2017

Materials

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“…However, one should not disregard the fact that acrylate restorations release residual monomer, benzoyl peroxide, plasticizers, and other substances into the oral environment, which dissolve in saliva and act on oral tissues. Soft acrylate plasticizers are soluble in oral fluids and their predicted loss over time leads to the hardening of the material in the patient’s mouth [ 39 ].…”

Section: Physico-mechanical Properties Of Dental Acrylate Polymersmentioning

confidence: 99%

The Use of Acrylate Polymers in Dentistry

et al. 2022

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The manuscript aimed to review the types of acrylate polymers used in dentistry, as well as their chemical, physical, mechanical, and biological properties. Regarding their consistency and purpose, dental acrylate polymers are divided into hard (brittle), which includes acrylates for the production of plate denture bases, obturator prostheses, epitheses and maxillofacial prostheses, their repairs and lining, and soft (flexible), which are used for lining denture bases in special indications. Concerning the composition and method of polymerization initiation, polymers for the production of denture bases are divided into four types: heat-, cold-, light-, and microwave-polymerized. CAD/CAM acrylate dentures are made from factory blocks of dental acrylates and show optimal mechanical and physical properties, undoubtedly better monomer polymerization and thus biocompatibility, and stability of the shape and colour of the base and dentures. Regardless of the number of advantages that these polymers have to offer, they also exhibit certain disadvantages. Technological development enables the enhancement of all acrylate properties to respond better to the demands of the profession. Special attention should be paid to improving the biological characteristics of acrylate polymers, due to reported adverse reactions of patients and dental staff to potentially toxic substances released during their preparation and use.

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The role of candida albicans on the development of stomatitis in patients wearing dentures

Jovanovi

Obradovi

Pej

et al. 2018

Sanamed

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Denture stomatitis is the most common inflammatory reaction that occurs in people who wear dentures. It is believed that in 60-65% of cases the cause of this inflammation is infections by yeasts from the genus Candida (C.), primarily Candida albicans infection. C. albicans is a part of the normal microflora of the respiratory and digestive tract. This yeast has the ability to adhere to the oral mucosa and to the base of the denture, as well as to form a biofilm. Its virulence is especially supported by the state of weakened resistance of the organism, when C. albicans expresses its pathological effect. This paper presents the pathogenesis of C. albicans-associated denture stomatitis, as well as the most common diagnostic and therapeutic procedures used to diagnose and successful therapy.

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Comparative Analysis of Water Sorption by Different Acrylic Materials

Cited by 5 publications

References 18 publications

Use of Almond Shells and Rice Husk as Fillers of Poly(Methyl Methacrylate) (PMMA) Composites

Use of Almond Shells and Rice Husk as Fillers of Poly(Methyl Methacrylate) (PMMA) Composites

The Use of Acrylate Polymers in Dentistry

The role of candida albicans on the development of stomatitis in patients wearing dentures

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