Mechanical and thermal properties of PMMA resin composites for interim fixed prostheses reinforced with calcium β-pyrophosphate

Chrysafi, Iouliana; Kontonasaki, Eleana; Anastasiou, Antonios D.; Patsiaoura, Dimitra; Παπαδοπούλου, Λ.; Vourlias, G.; Vouvoudi, Evangelia C.; Bikiaris, Dimitrios N.

doi:10.1016/j.jmbbm.2020.104094

Cited by 28 publications

(16 citation statements)

References 32 publications

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“…The heat capacity of these transformations for the BPA.GDA blend series decreases with the increasing amount of PC in the material, while for the EGDMA blends the trend is reversed. As shown in the literature, the T g of pure PMMA ranges from 104 to 122 °C and depends on the molar mass of the obtained polymer [ 38 , 42 , 43 ], while the T m of the PMMA is approximately 72 °C [ 44 ]. The broad exothermic peaks (in fact it is a change in slope of curve that comes from an endothermic peak with T recryst at 101 and 107 °C) for BPA.GDA + MMA + 1% PC and BPA.GDA + MMA + 5% PC blends are responsible for the recrystallization of PMMA crystallites or with polymorphic changes in the crystal structure.…”

Section: Resultsmentioning

confidence: 99%

Preparation, Thermal, and Thermo-Mechanical Characterization of Polymeric Blends Based on Di(meth)acrylate Monomers

et al. 2021

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This study presents the preparation and the thermo-mechanical characteristics of polymeric blends based on di(meth)acrylates monomers. Bisphenol A glycerolate diacrylate (BPA.GDA) or ethylene glycol dimethacrylate (EGDMA) were used as crosslinking monomers. Methyl methacrylate (MMA) was used as an active solvent in both copolymerization approaches. Commercial polycarbonate (PC) was used as a modifying soluble additive. The preparation of blends and method of polymerization by using UV initiator (Irqacure® 651) was proposed. Two parallel sets of MMA-based materials were obtained. The first included more harmless linear hydrocarbons (EGDMA + MMA), whereas the second included the usually used aromatic copolymers (BPA.GDA + MMA). The influence of different amounts of PC on the physicochemical properties was discussed in detail. Chemical structures of the copolymers were confirmed by attenuated total reflection–Fourier transform infrared (ATR/FT-IR) spectroscopy. Thermo-mechanical properties of the synthesized materials were investigated by means of differential scanning calorimetry (DSC), thermogravimetric (TG/DTG) analyses, and dynamic mechanical analysis (DMA). The hardness of the obtained materials was also tested. In order to evaluate the surface of the materials, their images were obtained with the use of atomic force microscopy (AFM).

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Section: Resultsmentioning

confidence: 99%

Preparation, Thermal, and Thermo-Mechanical Characterization of Polymeric Blends Based on Di(meth)acrylate Monomers

et al. 2021

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“…The spectrum of PMMA (un-doped film) shows three peaks at 2θ = 14.29 o , 30.41 o , and 41.89 o , that are broad and indicate the semicrystalline feature of PMMA or existance of wrong ordering[31]. A comparable XRD pattern was found for PMMA film prepared by ball milling[9]. Another research group found these broad peaks for pure PMMA at ~ 13.86 o , 29.42 o , and 42.33 o[29].…”

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confidence: 55%

Preparation and Characterization of CuO/Co3O4/ Poly(Methyl Methacrylate) Nanocomposites Films for Optical and Dielectric Applications

El-Sayed

Sayed

2021

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Composites of transition metal oxides (TMOs)/Polymers have many modern technological, industrial, and biological applications. Co3O4 and CuO nanoparticles (Nps) were synthesized by sol-gel. Then they doped into poly(methyl methacrylate) (PMMA) via solution casting method. The obtained Nps and nanocomposite films were then investigated using several techniques. XRD and HR-TEM indicated the high purity of Co3O4 and CuO Nps of face-centered cubic (fcc) with 58 nm average particle size (Dav), and monoclinic structure with Dav = 35 nm, respectively. The amorphous nature of PMMA was influenced after mixing with these Nps. SEM and FTIR confirmed the interaction between Nps and the polymer chains. The pure film showed transparency of about 90% and Nps addition narrowed the optical bandgap effectively while keeping the films with high transmittance. CuO is more effective than Co3O4 on the optical parameters of the films. The dielectric constant improved after adding the Nps, while all films have a low dielectric loss. Additionally, the effects of Co3O4 and CuO on the ac conductivity, Argand plots, and the dielectric modulus are reported. Our nanocomposites are considered a promising candidate for nanotechnology-based devices such as electric stress control, film capacitors and anti-reflective coating for solar cell applications.

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“…Under these conditions, an uncontrolled crack spread begins in the material, i.e., brittle cracking. The definition of catastrophic damage is presented in [69], and this type of brittle damage of PMMA based materials is illustrated in [70]. For the 2A material and some samples of the 1A material, a plastic destruction mechanism was observed.…”

Section: Discussionmentioning

confidence: 99%

Bending Behaviour of Polymeric Materials Used on Biomechanics Orthodontic Appliances

et al. 2020

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This paper discusses the issues of strength and creep of polymeric materials used in orthodontic appliances. Orthodontic biomechanics is focused on the movement of individual teeth or dental groups as a result of the force applied by orthodontic appliances. Stresses in the construction of functional and biomechanical appliances is generated when using the apparatus in the oral cavity. The orthodontic appliance must maintain its shape and not be damaged during treatment so strength and creep resistance are fundamental properties. It was assumed that the clinical success of orthodontic appliances can be determined by these performance properties. The aim of the work was the experimental assessment of comparative bending strength and creep resistance of selected popular polymer materials used in the production of biomechanical orthodontic appliances. Four commercial materials manufactured by the world class producers were tested: NextDent Ortho Rigid (Vertex-Dental B.V., Soesterberg, The Netherlands) marked as “1A”; Erkocryl (ERKODENT Erich Kopp GmbH, Pfalzgrafenweiler, Germany)-“2A”; Vertex Orthoplast (Vertex Dental B.V.), blue, marked as “3A” and material with the same name as “3A” but orange, marked in the article as “4A”. All the tests were carried out after aging in artificial saliva for 48 h at a temperature of 37 °C. Flexular strength and flexular modulus were made using the three point bending method according to the ISO 178 technical standard. Creep tests were carried out according to the method contained in ISO 899-2. The creep test was carried out in an artificial saliva bath at 37 °C. The creep tests showed significant differences in the strength, modulus and deformability of the tested materials. The strength reliability of the tested materials also varied. The research shows that the 2A material can be used for orthodontic applications in which long-term stresses should be lower than 20 MPa.

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Mechanical and thermal properties of PMMA resin composites for interim fixed prostheses reinforced with calcium β-pyrophosphate

Cited by 28 publications

References 32 publications

Preparation, Thermal, and Thermo-Mechanical Characterization of Polymeric Blends Based on Di(meth)acrylate Monomers

Preparation, Thermal, and Thermo-Mechanical Characterization of Polymeric Blends Based on Di(meth)acrylate Monomers

Preparation and Characterization of CuO/Co3O4/ Poly(Methyl Methacrylate) Nanocomposites Films for Optical and Dielectric Applications

Bending Behaviour of Polymeric Materials Used on Biomechanics Orthodontic Appliances

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