Journal articles: 'Thermoplastic acrylic resin'

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A. Hatim, Nadira, Amer A. Taqa, and Sufian A. Yassin. "Modification of heat cured acrylic resin by using additives to make a flexible acrylic resin denture base material: A pilot study." Edorium Journal of Dentistry 3, no. 1 (February 5, 2016): 1–11. http://dx.doi.org/10.5348/d01-2016-14-oa-1.

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Aims: The study was conducted to modify heat cured acrylic resin denture base material with additives [flavoring agents (caramel, banana)], and plasticizer into a flexible heat cured acrylic resin as a Flexite thermoplastic material. Methods: One hundred ninety-five samples of heat cured acrylic resin (HCAR) that consist of control group and three types of additives with two concentrations 15%, and 20% [flavoring agents (caramel, banana)], and plasticizer di-butyl phthalate (DBP) addition to (HCAR) 20% group, plasticizer (DBP) addition to (HCAR) group, flavoring (caramel) addition to (HCAR) group, flavoring (banana) addition to (HCAR) group and flexite thermoplastic material group were prepared to examine tensile strength, water sorption, solubility, color change and dimensional accuracy. Results: Statistically significant differences were identified between groups with and without additives exhibited higher mean value of tensile strength of flexite thermoplastic group. Duncan's multiple range test, and ANOVA were done to evaluate the effect of additives against each additive, concentration and storage time of samples. The result showed that the dimensional accuracy, water sorption and solubility tests of the groups (caramel + plasticizer + heat cured acrylic resin) had statistically lower changes than other groups with additives but were still higher than control group and Flexite thermoplastic during seven days. They also showed color change between groups. The first group (caramel + plasticizer + heat cured acrylic resin) with the concentration of 20% showed lowest change in their properties when compared with the plasticizer group and the other groups of flavors additions (caramel and banana) after seven days and six months. Conclusion: Within the limitation of this research, it was concluded that all prepared samples with additives (caramel, banana, and plasticizer) have better properties than the control group except the Flexite thermoplastic group which showed to have a higher tensile strength than control group during the periods of two and seven days.

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Koesomawati, Ria. "DIFFERENCES IN THE NUMBER OF CANDIDA ALBICANS COLONIES ON ACRYLIC RESIN AND THERMOPLASTIC NYLON IN SOURSOP LEAF EXTRACT IMMERSION." Interdental Jurnal Kedokteran Gigi (IJKG) 17, no. 2 (December 22, 2021): 123–31. http://dx.doi.org/10.46862/interdental.v17i2.2931.

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Introduction: Denture stomatitis is a chronic inflammation caused by wearing dentures, mainly caused by Candida albicans. Heat-polymerized acrylic resins are often used as denture bases, but lack the ability to absorb liquids due to their porosity and surface roughness. The basis of the latest dentures is thermoplastic nylon because it is more aesthetically, hypoallergenic and more flexible. Soursop leaf extract contains alkaloids, tannins, flavonoids, and saponins as antifungal. The purpose of this study was to examinate whether there were differences in the number of Candida albicans colonies on heat-polymerized acrylic resin plates and thermoplastic nylon in soursop leaf extract immersion. Materials and Methods: The research design was an experimental pre-post test with control group design, n = 50 plates were divided into 2 groups, heat-polymerized acrylic resin (n=25) and thermoplastic nylon (n=25), divided into 5 groups, 3 treatment groups using 10%,15%,25% soursop leaf extract, Fittident®and aquadest in the control groups. Samples were contaminated with Candida albicans suspension and incubated, counted before immersion for 8 hours, then put in Saboroud’s bath and counted again. Results and Discussions: Wilcoxon test analysis showed significant differences in all groups, except the aquadest group. The Mann-Whitney test showed significant differences between the treatment groups, except between the 25% extract and the Fittident®control group. Also, showed a significant difference in the 15% concentration group between heat-polymerized acrylic resin and thermoplastic nylon. Conclusion:There was a difference in the decrease in the number of Candida albicans colonies on heat-polymerized acrylic resin plates and thermoplastic nylon in soursop leaf extract at a concentration of 15%, while at concentrations of 10% and 25% there was no difference

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Jawad, Dr Raya Mohammed. "Evaluation of the effect of hypochlorite cleanser on water sorption and solubility of flexible and conventional hot – cure – acrylic denture base. (A comparative study)." Mustansiria Dental Journal 11, no. 1 (February 26, 2018): 31–42. http://dx.doi.org/10.32828/mdj.v11i1.222.

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Background: One of the primary applications for thermoplastics flexible resinsinvolved flexible partial dentures tooth born and combination flexible andchromium cobalt framework partial denture. There are certain to be many newclinical applications for thermoplastic resins in dentistry. The cleansers effectmaturity of the sterilization of acrylic resin denture base; therefore, it usingchemical or physical methods can minimize the risk of periodontal disease such asdenture related stomatitis in denture users.This study aims: to evaluate of the effect of hypochlorite cleanser on the watersorptsion and solubility of flexible and conventional hot – cure acrylic resindenture base. Compare the results on the water sorption and solubility betweenspecimens.Methods: Sixty of flexible and hot –cured acrylic resin specimens were prepared asfollowing:30 samples from hot – cure acrylic divided into two group 15 specimens immersein the hypochlorite and 15 specimens immerse in the water. The process is curedin the water bath according to the conventional method. 30 specimens fromflexible resin divided into two group 15 specimens immerse in the hypochloriteand 15 specimens immerse in the water. The process is cured in the plasticinjection machine.Results: showed highly significant differences among these groups. It showed that thehot – cured acrylic high water sorption and lower solubility and the flexible resinlower water sorption and high solubility.Conclusion:1. The comparison between the hot –cured acrylic and flexible resin denture baseimmersed in the hypochlorite and water on the water sorption is higher of thehot –cure acrylic and lower of the flexible resin.2. The flexible resin denture base immersed in the hypochlorite and water ishigher solubility compared with the hot –cured acrylic is lower solubility.

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Yerro, O., V. Radojevic, I. Radovic, M. Petrovic, P. S. Uskokovic, D. B. Stojanovic, and R. Aleksic. "Thermoplastic acrylic resin with self-healing properties." Polymer Engineering & Science 56, no. 3 (December 10, 2015): 251–57. http://dx.doi.org/10.1002/pen.24244.

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A. Alabady, Alkasim, and Bayan S. Khalaf. "Bond Strength Of Acrylic Soft Liner To Nd:Yag Laser-Treated Thermoplastic Acrylic Denture Base Material." 3C Tecnología_Glosas de innovación aplicadas a la pyme 12, no. 01 (March 31, 2023): 354–64. http://dx.doi.org/10.17993/3ctecno.2023.v12n1e43.354-364.

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Aim of the study: Using surface roughness and tensile bond strength tests, the objective of this investigation was to ascertain the impact of laser surface modification on the binding strength of injectable thermoplastic acrylic denture base material to acrylic-based soft-liner material. Materials and methods: Acrylic base soft liner material was bonded to injectable thermoplastic acrylic resin (Deflex). Forty specimens were created (20 disc, 20 dumbbells) 10 of each specimen type as control specimens, and 10 were treated with nano pulse Nd: YAG laser. The data were analyzed using the Kruskal-Wallis test and unpaired t-test (a=.05) and the roughness test was performed utilizing a double column universal test machine. Results: Compared to the control groups, the laser group had much increased roughness and tensile bond strength. Conclusions. Following Nd:YAG laser surface treatment, the tensile bonding strength between acrylic soft-liner material and thermoplastic acrylic was increased.

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Perrin, Henri, Masoud Bodaghi, Vincent Berthé, Sébastien Klein, and Régis Vaudemont. "On the Hot-Plate Welding of Reactively Compatibilized Acrylic-Based Composites/Polyamide (PA)-12." Materials 16, no. 2 (January 10, 2023): 691. http://dx.doi.org/10.3390/ma16020691.

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Joining of dissimilar thermoplastics and their composites is a challenge for thermal welding techniques due to different melting points. Reactive welding with an auxiliary functional material can offer the clear opportunities to develop joining processes due to robustness to joining dissimilar thermoplastic polymers and their composites. The current study employed reactive compatibilization to offer the possibility of joining an acrylic-based glass fiber composite to polyamide (PA)-12 by applying a hot-tool welding technique. For this purpose, composite plates are fabricated by a typical vacuum infusion and thin layer thermoplastic films are formed by a thermostamping of PA12 granules. Subsequently, the reactive welding of the interposed PA12 sheet and Elium®-GMA-Glass composite is conducted by hot-plate welding. A glycidyl methacrylate (GMA) as a compatibilizing agent is copolymerized with methyl methacrylate Elium® resin. During the hot-tool welding process of dissimilar thermoplastic material, GMA can react with the polyamide end groups. The heat distribution at the Elium® GMA/PA-12 interface is responsible for obtaining a strong joint. This study focuses on the functionality of the compatibilizer on the welding of acrylic-based composites with polyamide (PA)-12 while varying the assembly temperature. The flatwise tensile test proved the effectiveness of GMA on the interface bounding. The excellent bounding incompatible polymers Elium® resin (PMMA) and PA12 was achieved at 200 °C.

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Nam, Gwan-woo. "Study on Method Make Polymerization Resin and Thermoplastic Acrylic Resin Denture." Korean Journal of Security Convergence Management 7, no. 3 (August 31, 2018): 329–41. http://dx.doi.org/10.24826/kscs.7.3.25.

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Shrestha, Bidhan, E. Richard Hughes, Raj Kumar Singh, Pramita Suwal, Prakash Kumar Parajuli, Pragya Shrestha, Arati Sharma, and Galav Adhikari. "Fabrication of Closed Hollow Bulb Obturator Using Thermoplastic Resin Material." Case Reports in Dentistry 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/504561.

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Purpose.Closed hollow bulb obturators are used for the rehabilitation of postmaxillectomy patients. However, the time consuming process, complexity of fabrication, water leakage, and discoloration are notable disadvantages of this technique. This paper describes a clinical report of fabricating closed hollow bulb obturator using a single flask and one time processing method for an acquired maxillary defect. Hard thermoplastic resin sheet has been used for the fabrication of hollow bulb part of the obturator.Method.After fabrication of master cast conventionally, bulb and lid part of the defect were formed separately and joined by autopolymerizing acrylic resin to form one sized smaller hollow body. During packing procedure, the defect area was loaded with heat polymerizing acrylic resin and then previously fabricated smaller hollow body was adapted over it. The whole area was then loaded with heat cure acrylic. Further processes were carried out conventionally.Conclusion.This technique uses single flask which reduces laboratory time and makes the procedure simple. The thickness of hollow bulb can be controlled and light weight closed hollow bulb prosthesis can be fabricated. It also minimizes the disadvantages of closed hollow bulb obturator such as water leakage, bacterial infection, and discoloration.

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Bhudolia, Somen K., Goram Gohel, Durga Vasudevan, Kah Fai Leong, and Pierre Gerard. "Behaviour of Rectangular Hollow Thin Ply Carbon Thermoset and Thermoplastic Composite Tubes Subjected to Bending." Polymers 14, no. 7 (March 29, 2022): 1386. http://dx.doi.org/10.3390/polym14071386.

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Tubular composites are widely used in many industrial applications, and there is need to use new material and reliable manufacturing processes to improve the performance and process aspects. The current research presents a detailed study to understand the flexure response of rectangular tubular composites based on thin ply carbon fibres and Elium® resin. Another aim was to understand the failure mechanisms of novel tubular thermoplastic composite systems and carry out a baseline comparison with Epoxy-based tubular systems. In the current research, a bladder-assisted resin transfer moulding process was used to manufacture hollow thermoplastic composite tubes, and the bending behaviour of thin ply carbon (TPC) composite parts with novel Elium® (EL) and Epoxy (EP) resin as the matrix material was studied using a detailed experimental study. A testing method with optimized support span and a saddle was used to carry out three-point bending tests on the tubular composite structures. The TPC/EL composite tubes have shown 10% higher bending strength, with a noticeable increase in deformation due the presence of extended plasticity attributes for acrylic Elium resin. Failure mechanisms studied with the detailed microscopic investigation have shown severe catastrophic failure for epoxy-based composite tubes; however, acrylic Elium®-based composite tubes have shown different damage modes such as fibre splitting, resin infragmentation, and fibre resin-interfacial cracking.

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Yan, Xie, Tang Cheng, Li Mu, and Liu Jing. "Development of Corona Prevention Coatings for 750kV Substation in Operation." International Journal of Circuits, Systems and Signal Processing 17 (December 31, 2023): 194–200. http://dx.doi.org/10.46300/9106.2023.17.23.

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A single acrylic resin has poor conductivity and toughness, but strong hydrophilicity, which limits its application in high-voltage transmission corona prevention. In response to this issue, this article investigates the preparation of four types of acrylic composite conductive coatings with different additions of carbon fiber powder, multi-walled carbon nanotubes, and nano titanium dioxide. Through experimental testing, compare and analyze the effects of various fillers on the mechanical properties, conductivity, hydrophobicity, and heat resistance of acrylic composite conductive coatings. The experimental results show that the acrylic conductive coating prepared with thermoplastic acrylic resin as the matrix, carbon fiber powder and multi-walled carbon nanotubes as conductive fillers, and nano titanium dioxide as a self-cleaning agent has excellent performance characteristics in all aspects, and is suitable for corona prevention in ultra-high voltage transmission. This acrylic composite coating can be used to repair burrs and scratches on the surface of transmission lines, fill gaps in stranded wires, and achieve the goal of reducing the local electric field of high-voltage transmission lines to prevent wire corona.

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KUWASHIRO, Shiho, Nozomu NAKAO, Satoshi MATSUDA, and Hajime KISHI. "Bending Fatigue Resistance of Carbon Fiber Reinforced Thermoplastic Acrylic Resin." Journal of The Adhesion Society of Japan 53, no. 3 (March 1, 2017): 83–88. http://dx.doi.org/10.11618/adhesion.53.83.

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Crystal, Elis, and Hubban Nasution. "Perbedaan Transmisi Tekanan Pada Basis Gigi Tiruan Resin Akrilik Polimerisasi Panas dan Nilon Termoplastik." Jurnal Ilmiah PANNMED (Pharmacist, Analyst, Nurse, Nutrition, Midwivery, Environment, Dentist) 14, no. 2 (December 30, 2019): 102–7. http://dx.doi.org/10.36911/pannmed.v14i2.546.

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The purpose of this study was to evaluate The Difference in Pressure Transmission between Polymethyl-Methacrylate (PMMA) and Thermoplastic Nylon Denture Based. Material and methods: Mandibular first molar acrylic denture teeth (Bioeco) embedded on 15x15x3 mm3 thermoplastic nylon (Biotone) and poly methyl methacrylate denture bases were evaluated (n=9). A 100N force applied on the specimen using universal testing machine and the pressure transmitted under the specimen observed using pressure transducer. Results: The results showed that polymethyl methacrylate has the highest pressure transmission compared to thermoplastic nylon. This study can help dentists to determine the design of dentures, especially in the selection of denture base materials.

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Fonseca, Rodrigo Borges, Amanda Vessoni Barbosa Kasuya, Isabella Negro Favarão, Lucas Zago Naves, and Márcio Grama Hoeppner. "The Influence of Polymerization Type and Reinforcement Method on Flexural Strength of Acrylic Resin." Scientific World Journal 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/919142.

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The aim of this study was to evaluate the flexural strength of acrylic resin bars by varying the types of resin polymerization and reinforcement methods. Fourteen groups (N=10) were created by the interaction of factors in study: type of resin (self-cured (SC) or heat-cured (HC)) and reinforcement method (industrialized glass fiber (Ind), unidirectional glass fiber (Uni), short glass fiber (Short), unidirectional and short glass fiber (Uni-Short), thermoplastic resin fiber (Tpl), and steel wire (SW)). Reinforced bars (25×2×2 mm) were tested in flexural strength (0.5 mm/min) and examined by scanning electron microscopy (SEM). Data (MPa) were submitted to factorial analysis, ANOVA, and Tukey and T-student tests (a=5%) showing significant interaction (P=0.008), for SC: Uni(241.71±67.77)a, Uni-Short(221.05±71.97)a, Ind(215.21±46.59)ab, SW(190.51±31.49)abc, Short(156.31±28.76)bcd, Tpl(132.51±20.21)cd, Control SC(101.47±19.79)dand for HC: Ind(268.93±105.65)a, Uni(215.14±67.60)ab, Short(198.44±95.27)abc, Uni-Short(189.56±92.27)abc, Tpl(161.32±62.51)cd, SW(106.69±28.70)cd, and Control HC(93.39±39.61)d. SEM analysis showed better fiber-resin interaction for HC. Nonimpregnated fibers, irrespective of their length, tend to improve fracture strength of acrylics.

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Prasad, A. Hari, Kirti Roopwani, H. S. Mohammed, Vinaya Kundapur, M. Anand, and Arpita Dutta. "To Compare and Evaluate the Bond Strength of Acrylic Denture Teeth with Heat Cure Acrylic Resin and Thermoplastic Denture Base Material after Different Surface Treatments of Acrylic Teeth - An In Vitro Study." International Journal of Biomedical Science 14, no. 1 (September 15, 2018): 20–25. http://dx.doi.org/10.59566/ijbs.2018.14020.

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Background: Denture teeth made of acrylic resin are preferred because they chemically bond to denture base material but the problem of debonding is also common with the use of acrylic teeth. Many attempts have been done to improve bond strength of acrylic teeth which involves mechanical and chemical means. With the use of recently introduced thermoplastic denture base materials, the problem of tooth debonding has been increased due to the mechanical nature of the bond between these materials and the acrylic teeth. There is limited literature on bond strength of acrylic teeth and flexible denture materials and the methods to enhance it. The present study evaluates and compares the bond strength between acrylic teeth and heat cure resins and thermoplastic resins after different known denture tooth surface treatment methods, including use of methyl methacrylate; sandblasting and prefabricated vertical groove. Method: A total of 180 maxillary right central incisors were selected and divided into six groups of 30 samples each, according to the surface treatments and denture base material (heat cure or thermoplastic resins) used for processing. The bond strength of all specimens were tested in Universal Testing Machine. The obtained data were subjected to statistical analysis. Result: Results showed that there was statistical significant difference in mean bond strength after various surface treatments and processing of acrylic teeth with either heat cure or flexible denture material. Interpretation & Conclusion: The present findings suggest that vertical groove in the ridge lap area has highest bond strength amongst the groups processed with flexible denture material, and treatment of specimens with methyl methacrylate monomer for 5 sec has highest bond strength amongst all groups.

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Utami, Nurlita, Sena Atmaja, and Yogi Priyo Istiyono. "Analisis Pengendalian Kualitas Bahan Baku Acrylic Resin Pada Produk Spray Paint di PT X." Jurnal Penelitian Teknik industri 1, no. 1 (May 20, 2021): 31–41. http://dx.doi.org/10.51999/jpti.v1i1.4.

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Thermo Plastic Acrylic resin has an important role in the manufacture of spray paint, namely as a binder or binder. The resin in paint has a function as a film formation, has adhesion to the substrate as well as pigment binders and additives, so that to produce a spray paint with good quality mechanical properties, PT X must be selective in controlling the quality of the raw material for Thermo Plasic Acrylic Resin. The purpose of this study was to determine the problems faced by PT X related to the quality of Thermo Plastic Acrylic Resin raw materials, to identify the most dominant factors affecting the quality of these raw materials and to formulate the most appropriate solutions to be applied in improving the quality of these raw materials. This research uses observation, interview, and literature study methods. Sources of data came from stakeholders and quality control staff of PT X. This study used check sheets, histogram diagrams, u-control maps, and fishbone diagrams to complete the analysis process. From the test results of the Thermoplastic Acrylic Resin raw material, it is known that the factor that causes rejection is due to adhesion, namely 53.57%, gloss 33.33%, and dry touch 13.10%, all three of the total raw materials that are rejected when the raw material is applied in form paint and spray on the film plate. The most dominant cause of reject was poor adhesion, namely 53.57% of the total reject raw materials.

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Demski, Szymon, Kamil Dydek, Kinga Bartnicka, Kamil Majchrowicz, Rafał Kozera, and Anna Boczkowska. "Introduction of SWCNTs as a Method of Improvement of Electrical and Mechanical Properties of CFRPs Based on Thermoplastic Acrylic Resin." Polymers 15, no. 3 (January 18, 2023): 506. http://dx.doi.org/10.3390/polym15030506.

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The aim of this research was to improve the electrical and mechanical properties of carbon-fibre-reinforced polymers (CFRP) based on thermoplastic acrylic resin ELIUM®, by introducing single-walled carbon nanotubes (SWCNTs) into their structure. The laminates were fabricated using the infusion technique of infiltrating the carbon fabric with the mixture of acrylic resin and SWCNTs. The addition of SWCNTs improved the electrical conductivity through the thickness of the laminate by several times compared to the laminate without modification. No defects or voids were observed in the structure of the fabricated nanocomposites. The introduction of SWCNTs into the CFRP structure increased the Young’s modulus, interlaminar shear strength and impact resistance. DMA analysis showed almost no change in the glass transition temperature of the fabricated SWCNT/CFRP nanocomposites compared to the reference laminate.

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Al-Dharrab, Ayman, and Lana Shinawi. "Thermogravimetric Characterization of the Microstructure Composition of Polyamide Injection Molded Denture Base Material vs Conventional Compression Molded Heat-cured Denture Base Material." Journal of Contemporary Dental Practice 17, no. 2 (2016): 99–104. http://dx.doi.org/10.5005/jp-journals-10024-1810.

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ABSTRACT Background Thermoplastic resin polymers are widely used in medicine due to their biostability and hypoallergenic properties, making them a possible alternative to poly-methylmethacrylate (PMMA). The current research examined the microstructure of a rapid injection molding system thermoplastic resin for construction of flexible denture compared with that of heatcured PMMA. Materials and methods A total of 40 disk-shaped specimens (25 mm in diameter and 3 mm in thickness) were prepared and divided into two groups of 20 disks each (group I samples were of thermoplastic acrylic resin while group II was heat-cured PMMA resin). Results In group I, thermogravimetric analyzer showed that increasing the temperature up to 169°C resulted in about 1.3% of the material loss, and after that the material remains thermally stable up to 200°C. Group II showed 2.24% weight loss at 171°C, and further weight loss (12.025%) was observed on heating to 230°C. Fourier transform infrared (FTIR) spectrophotometer analysis in the range of 400–4000 cm-1 detected the presence of an amine group (N-H) in group I samples and the presence of methylene group attached to inorganic Si as reinforcement filler (Si-CH3). Conclusion Thermoplastic resin displayed excellent thermal stability and the absence of residual monomer within the polymerized material, suggesting its suitability for the fabrication dentures. How to cite this article Al-Dharrab A, Shinawi L. Thermogravimetric Characterization of the Microstructure Composition of Polyamide Injection Molded Denture Base Material vs Conventional Compression Molded Heat-cured Denture Base Material. J Contemp Dent Pract 2016;17(2):99-104.

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Castillo Pedraza, Midian Clara, Cristiane Mayumi Inagati, and Jorge Homero Wilches Visbal. "Uso de prótesis parcial removible con resina acrílica termoplástica: una revisión de literatura." Salud Uninorte 39, no. 01 (June 21, 2023): 265–83. http://dx.doi.org/10.14482/sun.39.01.222.315.

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La Prótesis Parcial Removible (PPR) es una alternativa de tratamiento cuando se trata de pacientes que perdieron algunos elementos dentarios, debido a que poseen como ventajas un costo relativamente bajo y una función masticatoria satisfactoria. Además, es una buena opción cuando hay perdida de los tejidos óseos, siendo imposibilitando la instalación de implantes dentarios. La PPR convencional presenta una estructura metálica que ofrece retención y resistencia a la prótesis, convirtiéndola en poco agradable a los pacientes, por el hecho de dejar evidente el metal en la cavidad oral. Muchos investigadores, con el objetivo de devolver más allá de la función y la estética, estudian diversas formas de presentación de la PPR, surgiendo así, a la Prótesis Parcial Flexible (PFlex). La PFlex es una prótesis parcial confeccionada con resina termoplástica, sin metal y con flexibilidad, pero su uso, para muchos profesionales, está limitado solo como prótesis temporales, aunque existen algunos clínicos que utilizan PFlex como alternativa de PPR convencional. Así, uno de los cuestionamientos constantes de los científicos es si realmente es posible utilizar a PFlex como alternativa protética definitiva. Por tanto, el proposito del presente trabajo fue realizar una revisión de la literatura para evaluar si el uso de prótesis parciales removibles con resina termoplástica puede ser una alternativa a las prótesis parciales convencionales, exponiendo las ventajas, desventajas, indicaciones, contraindicaciones y las propiedades del material protético.

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Shah, Syed Zulfiqar Hussain, Puteri S. M. Megat-Yusoff, Saravanan Karuppanan, Rizwan Saeed Choudhry, and Zubair Sajid. "Off-Axis and On-Axis Performance of Novel Acrylic Thermoplastic (Elium®) 3D Fibre-Reinforced Composites under Flexure Load." Polymers 14, no. 11 (May 30, 2022): 2225. http://dx.doi.org/10.3390/polym14112225.

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The flexure response of novel thermoplastic (Elium®) 3D fibre-reinforced composites (FRC) was evaluated and compared with a conventional thermoset (Epolam®)-based 3D-FRC. Ten different types of sample 3D-FRC were prepared by varying fibre orientations, i.e., 0°, 30°, 45°, 60° and 90°, and resin system, i.e., thermoplastic and thermoset. The bending characteristics and failure mechanisms were determined by conducting a three-point bend test. Results elucidate that the on-axis specimens show linear response and brittle failure; in contrast, the off-axis specimens depicted highly nonlinear response and ductile failure. The thermoplastic on-axis specimen exhibited almost similar flexure strength; in comparison, the off-axis specimens show ~17% lower flexure strength compared to thermoset 3D-FRC. Thermoplastic 3D-FRC shows ~40% higher energy absorption, ~23% lower flexure modulus and ~27% higher flexure strains as compared to its thermoset counterpart.

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Cengiz, Seda, Neslin Velioğlu, Murat İnanç Cengiz, Fehiye Çakmak Özlü, Ahmet Ugur Akbal, Ahmet Yılmaz Çoban, and Mutlu Özcan. "Cytotoxicity of Acrylic Resins, Particulate Filler Composite Resin and Thermoplastic Material in Artificial Saliva with and without Melatonin." Materials 15, no. 4 (February 16, 2022): 1457. http://dx.doi.org/10.3390/ma15041457.

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There is limited information on the effect of melatonin on the cytotoxicity of dental materials. The study evaluated the cytotoxic effects of heat- and auto-polymerized acrylic resin, particulate filler composite resin and a thermoplastic material on L-929 fibroblast cell viability at different incubation periods in artificial saliva without and with melatonin. Disk-shaped specimens were prepared according to each manufacturer’s instructions and divided into two groups to be stored either in artificial saliva (AS) and AS with melatonin (ASM). The measurements were performed using an MTT (3-(4,5)-dimethylthiazol-2-yl)-2,5-diphenyl tetrazoliumbromide) assay, in which the L-929 mouse fibroblasts cell culture was used. For the MTT test, extracts were examined at 1, 24, 72 h and 1 and 2 weeks. Data were analyzed using 3-way ANOVA and Tukey’s tests. No significant difference was found between groups AS and ASM (F = 0.796; p = 0.373). Incubation period significantly affected all materials tested (p < 0.001). Storing resin-based materials in artificial saliva with melatonin solution for 24 h may reduce cytotoxic effects on the fibroblast cells for which the highest effect was observed. Soaking resin prosthesis or orthodontic appliances in artificial saliva with melatonin at least 24 h before intraoral use or rinsing medium containing melatonin may be recommended for decreasing the cytotoxicity of dental resin materials.

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Huang, Jiao, Zhi Li Zhong, Hua Wu Liu, and Jin Wu Lu. "Development of Basalt Filament Highway Guardrail." Advanced Materials Research 627 (December 2012): 678–81. http://dx.doi.org/10.4028/www.scientific.net/amr.627.678.

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In order to reduce vehicle crash on highway, basalt fiber reinforced guardrail was developed in this study. The wave shaped framework was coated with thermoplastic acrylic resin, using injection molding machine. Tensile strengths of the samples were tested by a 3380Instron and the corresponding property of the composite was calculated on the basis of the composite mechanics. The results indicated that the basalt filament reinforced highway guardrail have the advantages of high strength, excellent corrosion resistance, relative low cost and so on.

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Khairunnisa, Sekar Hasna, and Fahmi Yunisa. "Redesign of Removable Partial Denture to Address Gingival Recession." PROCEEDING IMPROVE QUALITY IN DENTISTRY 1, no. 1 (March 26, 2024): 29–35. http://dx.doi.org/10.18196/imunity.v1i1.4.

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Tooth loss due to orofacial trauma could alter mastication, speech, and aesthetics of the patient which affect the patient's quality of life. After the acute phase of trauma has ended, further treatment is to restore the function and aesthetics by using protheses. Some treatment options are available, one of them is removable partial denture (RPD). Materials of RPD vary from cast metal, acrylic resin with metal clasp, and flexible thermoplastic resin. Cast metal and acrylic resin RPDs include a rest component to transfer the occlusal load toward the axis of abutment tooth, in order to provide support. Meanwhile, flexible partial denture has no rest components, which makes this prothesis lack of support. This condition may in turn affects the periodontal tissue. This article aims to restore the ideal design of RPD by using rest components to maintain periodontal health. A 23-year-old patient complains that her previous denture does not feel comfortable. She wore flexible removable denture for the past 5 years after she got an accident that makes her lost 3 of her teeth. From the objective examination, she lost 23, 24, and 25 teeth. Gingival recession was seen in tooth 26, bone resorption was seen in mesial tooth 26, negative palpation, inter occlusion was fine. The diagnosis of the patient is Edentulous Class III Kennedy. The treatment is redesigning the RPD into acrylic resin with clasp. The result is that this new prothesis functions well in patient. In conclusion, ideal design of RPD results more benefits for periodontal tissue.

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Palmieri, Barbara, Angelo Petriccione, Giuseppe De Tommaso, Michele Giordano, and Alfonso Martone. "An Efficient Thermal Cure Profile for Thick Parts Made by Reactive Processing of Acrylic Thermoplastic Composites." Journal of Composites Science 5, no. 9 (August 29, 2021): 229. http://dx.doi.org/10.3390/jcs5090229.

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The process of curing of large thick composite parts needs attention regarding the formation of residual stresses. Similarly, novel reactive thermoplastics need investigating to produce an efficient thermal cure profile that decreases the risk of warpage and residual stress. In this work, the polymerization kinetics of the Elium resin system is investigated by differential scanning calorimetry (DSC) tests, the analysis of thermo-grams, and the parameters of Kamal and Sourour’s semi-empirical model. A numerical model based on finite elements was set up to reproduce the temperature fields during part consolidation. Several processing conditions were investigated (dwell temperature, environment, heat exchange) in order to predict the thermal gradient within the part. The optimal cure profile was identified as a function of process parameters with the aim of minimizing the thermal gradient within the composite element. The analysis revealed that, for the reactive thermoplastic Elium, the consolidation in facilities with high thermal exchange may increase the risk of residual stresses within the parts, erasing the advantage of short cure cycles.

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Hasson, Huda Abed, and Lateef Essa Alwan. "The Influencing Effect of Silver Nitrate Fillers on the hardness of Flexible Resin." Journal of Techniques 4, no. 2 (June 30, 2022): 62–68. http://dx.doi.org/10.51173/jt.v4i2.490.

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The development of polymer chemically produces alternative materials to polymethyl methacrylate, such as nylon, and epoxy resin, these resins are modified by thermoplastic process, and This Received The disadvantage of acrylic resin is the colonization of microorganism growth of fungi and candida adhesion. This study is designed to evaluate and compared the consequence of silver nitrate fillers reinforcement Accepted flexible acrylic hardness as one of the mechanical properties to find the effect of various concentrations. A (0.1and 0. 2) ml of the filler (silver nitrate) additive to the flexible acrylic. Forty five (45) specimens were prepared for testing in this study. The hardness test was used in this study. The sample of this test was divided into (3) groups (control group) and experimental groups as follows: Group A= (15) specimens without silver nitrate (Control group 0% silver nitrate). Group B= (15) specimens with (0.1 ml) silver nitrate. Group C= (15) specimens with (0.2 ml) silver nitrate. All control and test groups were processed; curred then finished and polished the specimens ready for testing. Shore A test against the concentration of silver nitrate the result of this study showed a high significant increase in the mean value of hardness for control groups to the silver nitrate compared with experimental groups.

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Bhudolia, Somen K., Goram Gohel, Durga Vasudevan, Kah Fai Leong, and Pierre Gerard. "On the Mode I and Mode II Delamination Characteristics and Surface Morphological Aspects of Composites with Carbon-Thermoplastic Hybrid Fabrics and Innovative Liquid Thermoplastic Resin." Polymers 14, no. 19 (October 4, 2022): 4155. http://dx.doi.org/10.3390/polym14194155.

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In the current research, the delamination behavior under Mode I and Mode II loading for the hybrid carbon-thermoplastic fabrics in conjunction with novel liquid thermoplastic acrylic Elium® resin processable at ambient conditions was studied. The experimentation by incorporating doublers methodology, studying the performance under Mode I and Mode II loading, and understanding failure mechanisms using surface morphological fractography is deliberated. Hybrid Carbon-Ultra-high molecular weight polyethylene (UHMWPP)/Elium® composite has shown a 22.81% higher GIC and a 22.2% higher GIIC than Carbon-UHMWPP/Epoxy composite. On the contrary, the Carbon_Ultra-high molecular weight polypropylene (UHMWPE)/Elium® has shown an 11.11% higher Mode I critical energy release rate (GIC) and a 7.58% higher Mode II critical energy release rate (GIIC) than Carbon_UHMWPE/Epoxy composite. Hybrid fiber reinforced thermoplastic composites have shown severe plastic deformation of the matrix, rough fracture surface, and micro-cracks on the de-bonding surface, extensive fiber bridging, and crack branching which contributed to the improvement in the delamination behavior. Hybrid fiber architecture is also found to be detrimental by inducing crack arresting mechanisms including the tortuous crack path and the resin-rich pockets path due to the mismatch of the size of the fiber yarns.

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Kholief, Dina, and Shereen Kabeel. "An In-Vitro Evaluation of Alternative Disinfection Methods of Acrylic resin and Thermoplastic Resin Denture Base Materials." Al-Azhar Dental Journal for Girls 5, no. 3 (July 1, 2018): 243–55. http://dx.doi.org/10.21608/adjg.2018.17186.

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Obande, Winifred, Conchúr M. Ó Brádaigh, and Dipa Ray. "Continuous fibre-reinforced thermoplastic acrylic-matrix composites prepared by liquid resin infusion – A review." Composites Part B: Engineering 215 (June 2021): 108771. http://dx.doi.org/10.1016/j.compositesb.2021.108771.

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Kazemi, M. E., Logesh Shanmugam, Shusheng Chen, Lei Yang, and Jinglei Yang. "Novel thermoplastic fiber metal laminates manufactured with an innovative acrylic resin at room temperature." Composites Part A: Applied Science and Manufacturing 138 (November 2020): 106043. http://dx.doi.org/10.1016/j.compositesa.2020.106043.

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Hogans, William R., and John R. Agar. "The bond strength of elastomer tray adhesives to thermoplastic and acrylic resin tray materials." Journal of Prosthetic Dentistry 67, no. 4 (April 1992): 541–43. http://dx.doi.org/10.1016/0022-3913(92)90087-q.

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Singh, Kunwarjeet. "Injection Molding Technique for Fabrication of Flexible Prosthesis from Flexible Thermoplastic Denture base Materials." World Journal of Dentistry 3, no. 4 (2012): 303–7. http://dx.doi.org/10.5005/jp-journals-10015-1178.

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ABSTRACT Purpose To know properties, step-by-step procedure for fabrication and insertion of flexible prosthesis. Background Flexible denture base materials were introduced to dentistry by the name of Valplast and Flexiplast in 1950's. Injection molding technique is used for fabrication of various types of prostheses from these materials and fluid resins. Pryor used injection molding technique for introducing unpolymerized acrylic resin into the mold. In the mid 1970's Ivoclar introduced an injection molding system which used an acrylic resin modified for the injection molding process. Recently, numbers of dental manufacturing companies have introduced injection molding systems. Materials and methods The flexible denture base materials are superpolyamides which are available in the form of granules in cylinders of different sizes. These materials are thermoplastic in nature and needed to be converted into fluid form before pouring into mold under pressure. Each cylinder should be plasticized for 15 to 20 minutes at 550 to 560°F in an electric cartridge furnace before injecting the material into the flask. While injecting, the cylinder should be aligned with opening of flask and the levers of the press should be turned rapidly to apply firm pressure until the springs of the press are fully compressed. The pressure should be maintained for 3 to 5 minutes and the flask should be allowed to bench cool for 15 to 20 minutes before opening. Conclusion This technique can be used for fabrication of different types of prostheses from flexible denture base materials and fluid resins. How to cite this article Singh K, Gupta N. Injection Molding Technique for Fabrication of Flexible Prosthesis from Flexible Thermoplastic Denture base Materials. World J Dent 2012;3(4):303-307.

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Demski, Szymon, Dariusz Brząkalski, Maciej Gubernat, Kamil Dydek, Paweł Czaja, Konrad Żochowski, Paulina Kozera, et al. "Nanocomposites Based on Thermoplastic Acrylic Resin with the Addition of Chemically Modified Multi-Walled Carbon Nanotubes." Polymers 16, no. 3 (February 2, 2024): 422. http://dx.doi.org/10.3390/polym16030422.

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The main goal of this work was an improvement in the mechanical and electrical properties of acrylic resin-based nanocomposites filled with chemically modified carbon nanotubes. For this purpose, the surface functionalization of multi-walled carbon nanotubes (MWCNTs) was carried out by means of aryl groups grafting via the diazotization reaction with selected aniline derivatives, and then nanocomposites based on ELIUM® resin were fabricated. FT-IR analysis confirmed the effectiveness of the carried-out chemical surface modification of MWCNTs as new bands on FT-IR spectra appeared in the measurements. TEM observations showed that carbon nanotube fragmentation did not occur during the modifications. According to the results from Raman spectroscopy, the least defective carbon nanotube structure was obtained for aniline modification. Transmission light microscopy analysis showed that the neat MWCNTs agglomerate strongly, while the proposed modifications improved their dispersion significantly. Viscosity tests confirmed, that as the nanofiller concentration increases, the viscosity of the mixture increases. The mixture with the highest dispersion of nanoparticles exhibited the most viscous behaviour. Finally, an enhancement in impact resistance and electrical conductivity was obtained for nanocomposites containing modified MWCNTs.

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Han, Doo Hee. "Convergence Study on the use of Electrolyzed Water Device with CNT Cathode in Health Field." International Journal of Emerging Technology and Advanced Engineering 11, no. 3 (March 25, 2021): 8–13. http://dx.doi.org/10.46338/ijetae0321_02.

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An electrolytic water sterilization device was developed that employs CNT (carbon nano tube) as a cathode. CNT plastic composite material is pulverized with a waterdispersible acrylic anionic resin added with castor oil and a dispersion, polypropylene resin mixed with CNT, and thermoplastic elastomer to make pellets. This CNT composite material is a metal-free electric conductor with excellent chemical resistance and surface electrical resistance of 1Ω/□ or less. When this electrolytic water sterilizer was used as cleaning water for dental treatment and sink cleaning water, it was eco-friendly and showed excellent removal rate. This device can effectively remove pesticides from fruits, etc. and remove bacteria by washing pork. In addition, the water in the swimming pool can be sterilized and purified without using chemicals. In this case, environmental conservation and economic costs can be reduced by not generating wastewater that causes environmental pollution

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Jang, Dae-Eun, Ji-Young Lee, Hyun-Seon Jang, Jang-Jae Lee, and Mee-Kyoung Son. "Color stability, water sorption and cytotoxicity of thermoplastic acrylic resin for non metal clasp denture." Journal of Advanced Prosthodontics 7, no. 4 (2015): 278. http://dx.doi.org/10.4047/jap.2015.7.4.278.

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Hummoudi, Israa M. "Effect of Silica Layer on Bonding Strength of Thermoplastic Nylon to Cold Cure Acrylic Resin." Journal of Baghdad College of Dentistry 25, no. 3 (September 2013): 24–27. http://dx.doi.org/10.12816/0014993.

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Gastaldo, José Fábio Guastelli, Angélica Castro Pimentel, Maria Helena Gomes, Wilson Roberto Sendyk, and Dalva Cruz Laganá. "Stress Analysis on Single Cobalt/Chrome Prosthesis With a 15-mm Cantilever Placed Over 10/13/15-mm–length Implants: A Simulated Photoelastic Model Study." Journal of Oral Implantology 41, no. 6 (December 1, 2015): 706–11. http://dx.doi.org/10.1563/aaid-joi-d-13-00139.

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The aim of study was to assess the stress around 10/13/15-mm implants in the mandibular area with a 15-mm cantilevered acrylic-resin–coated prostheses following the application force, using the photoelasticity method. Three photoelastic mandibular models were created containing 10-, 13-, and 15-mm implants in length and 3.75 mm in diameter. The implants had bore internal hex connections and were placed parallel to the intermental region. Abutments with 1-mm high cuffs were placed over the implants, and a single cobalt/chrome metallic prosthesis with a 15-mm cantilever, coated with thermoplastic acrylic resin, was placed on top. Loads of 1.0 and 3.0 bars were applied, and the images were photographed and assessed by photoelasticity method. The greatest stress levels were observed for the 10-mm implants. The stress pattern was the same regardless of implant length; only the magnitude of the stress along the implant body revealed changes. Increased implant length played a role in reducing stress on the investigated area of the model, and the 15-mm implants exhibited the best performance in regard to stress distribution. The highest stress levels were found in the implants closest to the cantilever and the central implant. The longest implants were more favorable in regard to the stress distribution on the peri-implant support structures in the 15-mm cantilevered prosthesis under loads.

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Valle, Vladimir, Alex Aguilar, Jeronimo Kreiker, Belén Raggiotti, and Francisco Cadena. "Oil Palm Empty Fruit Bunch (OPEFB) Fiber-Reinforced Acrylic Thermoplastic Composites: Effect of Salt Fog Aging on Tensile, Spectrophotometric, and Thermogravimetric Properties." International Journal of Polymer Science 2022 (April 15, 2022): 1–18. http://dx.doi.org/10.1155/2022/6372264.

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The prioritization of agroindustry fiber wastes as raw materials in development of composites has become a challenge to obtain higher value-added products with targeted applications. In this study, natural fiber-reinforced polymer matrix composites were elaborated using two fiber sizes (605 μm and 633 μm) of oil palm empty fruit bunch (OPEFB) and acrylic thermoplastic resin. In doing so, resin and fibers were mixed at room temperature by maintaining filler content of 42 wt. % for all formulations. In addition, thermomechanical compression moulding was used as composite manufacturing process at four processing temperatures (80, 100, 120, and 140°C). All formulations were subsequently exposed to salt fog spray aging for 330 hours. The effects of accelerated aging process on mechanical, spectrophotometric, and thermogravimetric characteristics were studied. On the whole, results have shown feasibility to use a facile method to elaborate composites based on waterborne acrylic matrix and OPEFB fibers. After salt spray testing, it was observed detectable levels of Aspergillus spp. of fungi in all samples, as a result of phylogenetic organization of microbial activity. Tensile behavior of composites was significantly influenced by processing temperature and fiber size. In broad terms, their overall mechanical properties were improved by the increase of temperature. Additionally, infrared spectroscopy results showed important bands mainly associated to biodegradation of cellulose, hemicellulose, and lignin. On the other hand, two degradation stages were mainly identified in thermogravimetric evaluation. Noteworthy, aging had no significant effect on the thermal properties of composites.

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Buzatu, Roxana, Anca S. Valceanu, Adelina Grigore, and Camelia Szuhanek. "The Evaluation of the BioBleach Trays Efficiency and manufacturing process." Materiale Plastice 54, no. 3 (September 30, 2017): 485–86. http://dx.doi.org/10.37358/mp.17.3.4876.

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Tooth bleaching and other cosmetic treatments (performed at home or in the dental office) are very common nowadays. The use of thermoplastic materials for the manufacturing of whitening trays should have good biomechanical properties in order to assure a good treatment outcome with a good esthetic result. The most common tray manufacturing material is an acrylic poly-resin thin foil that can be vacuum-formed in order to fit any clinical situation. The material must be inert in order to prevent harmful free radicals release form the interaction with different bleaching substances. Thermoformed trays were manufactured in our dental office and immersed in a mixed oral suspension (that also contained artificial saliva) in order to test the behavior of the material in the intraoral environment.

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Bel Haj Frej, Haithem, Romain Léger, Didier Perrin, Patrick Ienny, Pierre Gérard, and Jean-François Devaux. "Recovery and reuse of carbon fibre and acrylic resin from thermoplastic composites used in marine application." Resources, Conservation and Recycling 173 (October 2021): 105705. http://dx.doi.org/10.1016/j.resconrec.2021.105705.

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Kazemi, M. E., Logesh Shanmugam, Zhonghong Li, Rui Ma, Lei Yang, and Jinglei Yang. "Low-velocity impact behaviors of a fully thermoplastic composite laminate fabricated with an innovative acrylic resin." Composite Structures 250 (October 2020): 112604. http://dx.doi.org/10.1016/j.compstruct.2020.112604.

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Meng, Long-Yue, and Soo-Jin Park. "Preparation and characterization of nanoporous carbons from thermoplastic acrylic resin for an electric double layer capacitor." Macromolecular Research 20, no. 10 (June 5, 2012): 1102–4. http://dx.doi.org/10.1007/s13233-012-0155-6.

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Wang, Yijun, and Isabel K. Lloyd. "Time-dependent nanoindentation behavior of high elastic modulus dental resin composites." Journal of Materials Research 25, no. 3 (March 2010): 529–36. http://dx.doi.org/10.1557/jmr.2010.0070.

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Nanoindentation and the viscous-elastic–plastic (VEP) model developed by Oyen and Cook for lightly filled thermoplastic polymer composites were used to characterize the elastic modulus, hardness, and viscoelastic response of a new high elastic modulus dental resin composite. The VEP model was used because loading rate studies indicated a viscous component in the loading/unloading response of our highly filled, thermosetting acrylic resin composites. Increasing the volume fraction of our high modulus filler increased the elastic modulus and hardness and decreased the viscous response in our composites. Coupling the filler and resin matrix with a commercial coupling agent like Metaltite or MPTMS (3-methacryloxypropyltrimethoxysilane) that ionically bonds to the filler and covalently bonds to the matrix decreases the viscous response and increases the hardness of the composite. The coupling agents did not affect the elastic modulus. The ability of the VEP model to predict load–displacement trajectories and the correlation of the elastic modulus and hardness values determined from the VEP model with those from the direct continuous stiffness measurement mode nanoindentation measurements indicate that the VEP model can be extended to highly filled, thermosetting systems. This is valuable since the potential to predict elastic, plastic, and viscous contributions to behavior should be valuable in the design and understanding of future highly filled resin composite systems.

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Ahmed Shihab, Reem. "Impact of Sorts Disinfection and Cleansing Material on Hardness of Different Types of Denture Base Material." Tikrit Journal for Dental Sciences 5, no. 2 (January 16, 2024): 135–42. http://dx.doi.org/10.25130/tjds.5.2.7.

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Dentist, dental technician and assistants are faced a several kinds of microorganisms during wor like bacteria, fungi and viruses .So, we can prevent cross contamination by using either chemica or mechanical disinfection. The aim of the research was to measure the effect of different types of chemical disinfection on the hardness of two types of denture base resin, heat activated acry and nylon (flexible). A total number of 80 denture resin specimens (40 specimens from hea activated acrylic and 40 specimens from flexible resin) were prepared. Each type of specim was subdivided into 4 groups. Three groups were divided according to the type of dentur disinfectants (1%sodium hypochlorite, 1% povidine/iodine, Kin solution) and the fourth whi considered as control group was immersed in distilled water. All specimens were immersed testing solution for 90 minutes at 370C. The hardness of the specimens before and af immersion was tested using Shore D machine. Our study showed that the mean value hardness test for poly methyl methacrylate higher than polyamide and there need aid non significant Contrast in the resistance of the surface to scratches and indentation between diver sorts of thermoplastic resin after using chemical disinfectant and denture cleansers w i comparison with control group for each type of denture base resin. The resistance to indentati of different types of denture base would not affected by short time immersion in chemica disinfectant.

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Naji, Ghassan Abdul-Hamid. "Influence of Various Chemical Surface Treatments, Repair Materials, and Techniques on Transverse Strength of Thermoplastic Nylon Denture Base." International Journal of Dentistry 2020 (September 9, 2020): 1–10. http://dx.doi.org/10.1155/2020/8432143.

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The process of repairing the fractured nylon denture bases and addition of acrylic teeth to the previously worn nylon denture bases has not been widely studied. This study aims to assess the transverse strength of nylon denture bases repaired by various resin materials, different curing techniques, and types of surface treatments. Materials and Methods. One hundred fifty thermoplastic nylon denture base samples were fabricated using plastic patterns measuring 65 × 10 × 2.5 mm (length, width, and thickness, respectively). These samples were then divided into three equal groups. Fifty samples were repaired by microwave heat-polymerization, fifty samples were repaired using the Ivomate autopolymerization, and the other fifty were repaired using light-polymerized acrylic resin. Each of these three groups was further divided into five subgroups of ten samples based on the type of surface treatment. The samples in the control group did not undergo any surface treatment, and the other four groups were chemically surface treated with monomer, acetone, ethyl acetate, and isopropanol, respectively. A three-point bending test was used to calculate the transverse strength values of the samples. Fourier transform infrared (FTIR) analysis was conducted to determine the component of functional groups between the polyamide nylon base and poly(methyl-methacrylate) PMMA repair materials. A polarizing microscope was utilized to investigate the mode of failure at the fracture surfaces. Results. The collected data were analyzed with one-way ANOVA and Sidak’s multiple comparison test to show the differences among different groups. For surface treatments, the highest transverse strength values were obtained by monomer-treated samples (18.29 N/mm2); however, the lowest values were obtained in non-surface treated samples (5.58 N/mm2). While for repair techniques, the highest transverse strength values were obtained by microwave processing, followed by Ivomate and then the light-cured polymerization. The means were found to be significant (p<0.001). FTIR analysis shows the presence of hydrogen bonding which is due to the ester and amid groups which enhance the bond strength of the surface-treated samples. The interface of the polarizing microscope images revealed a cohesive fracture within repair materials rather than the adhesive nature. Conclusion. The microwave-polymerized resin was considered as the most effective repair technique along with monomer chemical etchant which creates a tight adhesion between PMMA and nylon denture base in comparison to other groups.

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Hewlett, Sandra Ama, Ebenezer Anno Nyako, Thomas Akuetteh Ndanu, and Oluwole Oyekunle Dosumu. "A comparative evaluation of masticatory efﬁciency and satisfaction with different types of removable partial dentures: a pilot crossover randomized study." BOHR International Journal of Current Research in Dentistry 2, no. 1 (2023): 16–21. http://dx.doi.org/10.54646/bijcrid.2023.13.

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Aims: This study evaluated the subjective experience of masticatory performance and masticatory efficiency in partially edentulous patients rehabilitated with three different types of removable partial dentures (RPDs). Materials and methods: This was a crossover randomized study, which was carried out at the prosthodontics clinic of the University of Ghana Dental School clinic. Sixteen patients requiring RPDs but had never worn one before were consecutively recruited for the study. Three different RPDs [i.e., cobalt chromium, acrylic, and thermoplastic resin (iFlex)] were fabricated for each patient. Masticatory efficiency was assessed using a singlesieve method after chewing raw carrots. The subjective experience of masticatory performance was also assessed using a questionnaire after 1 week of using each denture. Results: The cobalt-chromium denture recorded the highest masticatory efficiency (31.4%), and the iFlex denture recorded the lowest (27.9%). Subjectively, the cobalt-chromium denture was ranked as the denture they were most satisfied with when chewing with the least being the acrylic denture. Conclusion: Despite the fact that the iFlex, flexible denture had an overall appeal, where effective chewing is of great concern to prospective RPD patients, the cobalt-chromium denture may have a slightly better advantage.

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Han, Ning, Ismet Baran, Jamal Seyyed Monfared Zanjani, Onur Yuksel, LuLing An, and Remko Akkerman. "Experimental and computational analysis of the polymerization overheating in thick glass/Elium® acrylic thermoplastic resin composites." Composites Part B: Engineering 202 (December 2020): 108430. http://dx.doi.org/10.1016/j.compositesb.2020.108430.

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Das, Subrata Chandra, Chaman Srivastava, Stergios Goutianos, Angela Daniela La Rosa, and Sotirios Grammatikos. "On the Response to Hygrothermal Ageing of Fully Recyclable Flax and Glass Fibre Reinforced Polymer Composites." Materials 16, no. 17 (August 26, 2023): 5848. http://dx.doi.org/10.3390/ma16175848.

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The present work studies the response to hygrothermal ageing of natural fibre composites (NFCs) against synthetic fibre composites when using three different types of polymers as matrices. For ageing, coupons were fully immersed in distilled water at 23, 40, and 60 °C for a total ageing period of 56 days. Flax fibre-reinforced composites, using two recyclable polymer systems: (i) a bio-based recyclable epoxy and (ii) an acrylic-based liquid thermoplastic resin, were tested against conventional glass fibre-reinforced composites employing a synthetic (petroleum-based) epoxy. Different fibre/polymer matrix material combinations were tested to evaluate the effects of hygrothermal ageing degradation on the reinforcement, matrix, and fibre/matrix interface. The hygrothermal ageing response of unaged and aged composite coupons was assessed in terms of flexural and viscoelastic performance, physicochemical properties, and microscopy (SEM—Scanning Electron Microscopy).

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Matadi Boumbimba, R., M. Coulibaly, A. Khabouchi, G. Kinvi-Dossou, N. Bonfoh, and P. Gerard. "Glass fibres reinforced acrylic thermoplastic resin-based tri-block copolymers composites: Low velocity impact response at various temperatures." Composite Structures 160 (January 2017): 939–51. http://dx.doi.org/10.1016/j.compstruct.2016.10.127.

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Moussa, Amani Ramadan, Wessam Mohamed Dehis, Asmaa Nabil Elboraey, and Hisham Samir ElGabry. "A Comparative Clinical Study of the Effect of Denture Cleansing on the Surface Roughness and Hardness of Two Denture Base Materials." Open Access Macedonian Journal of Medical Sciences 4, no. 3 (August 22, 2016): 476–81. http://dx.doi.org/10.3889/oamjms.2016.089.

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AIM: This study aimed to verify the influence of oral environment and denture cleansers on the surface roughness and hardness of two different denture base materials. METHODS: A total of sixteen identical removable disc specimens (RDS) were processed. Eight RDS were made from heat-cured acrylic resin (AR) and the other eight were fabricated from thermoplastic injection moulded resin (TR). Surface roughness and hardness of DRS were measured using ultrasonic profilometry and Universal testing machine respectively. Then the four RDS (two AR and two of TR) were fixed to each maxillary denture, after three months RDS were retrieved. Surface roughness and hardness of RDS have measured again.RESULTS: The surface roughness measurements revealed no significant difference (p >0.05) for both disc groups at baseline. However, both groups showed a significant increase in the surface roughness after three months with higher mean value for (TR) group. On the other hand, the (AR) group showed higher hardness mean value than (TR) group at baseline with no significant decrease in the hardness values (p >0.05) following three months follow-up period. CONCLUSIONS: Denture cleansers have an effect on the dentureâ€™s surface roughness and hardness concurrently with an oral condition which will consequently influence the complete denturesâ€™ lifetime and patientsâ€™ satisfaction.

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Ondiek, Wycliffe, Masahiro Kondo, Maki Adachi, Arnaud Macadre, and Koichi Goda. "Effect of Surface Coating and Plasma Treatment on Mechanical Properties of Wood Plastic Composites." Journal of Composites Science 7, no. 7 (July 17, 2023): 296. http://dx.doi.org/10.3390/jcs7070296.

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Mechanical properties of plasma-irradiated and surface-coated wood plastic composites (WPCs) have been investigated in this paper. WPCs were developed by injection molding technique using wood fiber (WF) as reinforcement and polypropylene (PP) as matrix. The short, discontinuous WF was compounded with thermoplastic PP at varying weight fractions of 0 wt%, 25 wt% (WP25), and 50 wt% (WP50) to yield tensile test specimens in accordance with JIS K7139-A32 standards. Subsequently, plasma treatment was performed on the test-pieces, followed by surface coating by immersion in acrylic resin liquid containing homogeneously dispersed TEMPO-oxidized cellulose nanofibers (CNF). The results indicate an increase in surface roughness after plasma irradiation, but surface coating of the specimens with acrylic paint and CNF decreased their surface roughness by ∼50% in comparison to the untreated specimens. Plasma treatment and surface coating also increased the tensile strength of neat PP, WP25 and WP50 specimens by 5.4–7.1%, 3.5–3.7% and 3.0–3.6%, respectively, whereas their fracture strains tended to decrease. Compared to the untreated specimens, the surface-coated specimens generally displayed higher tensile strength. This finding is a corroboration that the observed increase in strength is highly contingent on the adhesion between the specimen surface and the coating layer than on the improvement in surface roughness. Thus, it is inferable that surface coating could be of great importance in enhancing the mechanical performance of WPCs.

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Gohel, Goram, Somen K. Bhudolia, Kah Fai Leong, and Pierre Gerard. "On the structural damping response of hollow carbon composite shafts with room temperature curable novel acrylic liquid thermoplastic resin." Composites Communications 29 (January 2022): 100990. http://dx.doi.org/10.1016/j.coco.2021.100990.

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Journal articles on the topic 'Thermoplastic acrylic resin'

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