Thermoplastic Resins used in Dentistry

Ardelean, Lavinia; Borţun, Cristina Maria; Podariu, Angela Codruţa; Rusu, Laura Cristina

doi:10.5772/60931

Cited by 7 publications

(8 citation statements)

References 6 publications

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“…Accordingly, the lower MC in shellac, as well as in its wax, results in higher stability for the formulated tooth varnish. Interestingly, shellac varnish is fairly resistant to water, although its resistance is greatly reduced over a period of time [ 26 , 70 ]. The results showed the very great effect of a small amount of adsorbed water on its fluidity [ 68 ].…”

Section: Discussionmentioning

confidence: 99%

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Bioplastic Floss of a Novel Microwave-Thermospun Shellac: Synthesis and Bleaching for Some Dental Applications

2022

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In this paper, crude flakes (CFs) of shellac were converted into purified, nonwoven, thermospun fibers (shellac floss) using two devices, namely, an electric thermospinner (ETS) and a microwave thermospinner (MTS). This conversion was achieved by the action of heating and the centrifugal forces that arose toward the outside of the spinner-head cavity. The dissolved MTS floss was bleached using hydrogen peroxide to produce the bleached MTS floss. The unbleached shellac (CFs, ETS floss, and MTS floss) and the bleached MTS floss were characterized physically and chemically. There was no deterioration in the floss properties due to the heating tools or bleaching process. For the unbleached shellac, although there were no statistical differences in properties among the three shellac types (CFs, ETS floss, and MTS floss), except for insolubility in hot alcohol, acid value, and moisture content, the MTS floss exhibited superior values compared with the other types for nearly all the properties studied. Bleaching the MTS floss produced the greatest color change among other studies, caused a high reduction in insoluble solid matter due to increasing the solubility of some of the solid constituents of shellac, and slightly decreased its Young’s modulus (E). The important dental applications were surveyed and it was suggested that the suitability was enhanced by using the bleached MTS floss, based on its superior whiteness, along with the unique properties detected.

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Section: Discussionmentioning

confidence: 99%

“…For dentistry applications, shellac is used for partial dentures and frameworks, clasps, primary crowns and bridges, full dentures, orthodontic appliances, anti-snoring devices, and various types of mouth guards and splints [ 26 ]. Shellac base plates are useful in constructing special trays and temporary denture bases [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Bioplastic Floss of a Novel Microwave-Thermospun Shellac: Synthesis and Bleaching for Some Dental Applications

2022

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“…The injection of the thermoplastic polymers as Valplast into molds need expensive equipment and this could be a disadvantage. Polyapress (Bredent) was the special injection apparatus that was used in our study [16]. The polyamide thermoplastic dental materials present predictable long-term efficiency.…”

Section: Discussionmentioning

confidence: 99%

Comparative study of the comfort in patients rehabilitated with three types of partial dentures

Bechir

Suciu

2019

Acta Stomatologica Marisiensis Journal

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Introduction: At present, the researchers are targeted to improve and increase the biocompatibility of dental materials that are in direct contact with biological tissues. The biocompatibility of the dental materials that contact the tissues of the oral cavity present relevance for the patient, clinician, dental technician, and manufacturer.Aim of the study: The aim of this study was represented by the comparative research regarding the comfort of the patients wearing removable partial prostheses with clasps made of wire and flexible polymers.Material and Methods. Patients wearing partial dentures from Meliodent heat-cured acrylic resins with wipla wire clasps, flexible partial dentures made from Valplast and dentures with clasps of CuSil silicone rubber participated in this study. The research was performed on 3 groups, of 8 patients each, in which comfort levels (according to 5 criteria) were determined, after 6, 12, 18, respectively 24 months of the partial removable prostheses insertion in the oral cavity.Results. Presence of decubitus lesions of the oral mucosa in the clasps areas was noticed mostly in the Valplast polyamide dentures (37.5%), existence of color changes at the base of prostheses and of clasps area appeared in 37.5% of the third group (CuSil PAD) patients, no patient included in the study presented allergic reactions and at the third and fourth recall, only 1 patient of all groups complained of unpleasant taste in the oral cavity.Conclusion. The removable prosthetic restorations with clasps made of flexible polymers and CuSil gaskets of silicone rubber, although initially much more comfortable and therefore much better accepted by patients, after two years were no longer active, could not be activated and necessited technical restorations, compared to those made of wipla wire clasps, which were activated with pliers, or, in the case of fracture, were replaced by the technician in the dental laboratory.

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“…Thermoplastic materials are suitable for the manufacturing of removable partial dentures, which totally or partially eliminate the metallic framework and clasps, resulting in the so-called "metal-free removable partial dentures." If desired, any combination of the metallic framework or clasps with thermoplastic resin saddles and clasps is possible (Figure 10) [52,53].…”

Section: Thermoplastic Resinsmentioning

confidence: 99%

Alternative Denture Base Materials for Allergic Patients

Ardelean¹,

Rusu²,

Tigmeanu³

2022

Dentistry

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Traditionally, a denture base is manufactured using a heat-cured acrylic resin. This type of resin was first used in dental labs in 1936, being a great step forward. Because of the many disadvantages as increased porosity, high water sorption, polymerization shrinkage, allergenic potential and citotoxicity due to the residual monomer, awkward flasking and packaging, and difficult processing, alternatives were continuously searched. Monomer-free and high-impact acrylics were developed, and gold plating of the denture base was experienced, in order to provide an alternative to allergic patients. Once polymers developed, new types of resins, such as polyamides (nylon), acetal, epoxy resins, styrene, polycarbonate, vinyl, urethane, polyether ether ketone (PEEK), became available on the dental market, accompanied by modern technologies, such as injection. CAD/CAM milled and 3D printed denture bases represent the present state of the art in this domain. Our chapter aims to present these alternative materials, which are safe to use in cases of allergic patients and guarantee a healthy oral environment and a high degree of comfort.

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Thermoplastic Resins used in Dentistry

Cited by 7 publications

References 6 publications

Bioplastic Floss of a Novel Microwave-Thermospun Shellac: Synthesis and Bleaching for Some Dental Applications

Bioplastic Floss of a Novel Microwave-Thermospun Shellac: Synthesis and Bleaching for Some Dental Applications

Comparative study of the comfort in patients rehabilitated with three types of partial dentures

Alternative Denture Base Materials for Allergic Patients

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