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Dental Thermoplastic

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https://www.readbyqxmd.com/read/30063127/elastic-dental-prostheses-alternative-solutions-for-patients-using-acrylic-prostheses-literature-review
#1
REVIEW
Zdzisław A Bogucki, Mariola Kownacka
Elastic dentures are prostheses made of thermoplastic material. This category includes: nylons, acetals, acrylicpolymers, and acrons. Elastic prostheses have been recognized for several years; however, their propertiesare constantly being modified. In the opinion of the majority of patients, elastic prostheses are comfortable,handy and long-lasting. Elastic dentures are a good choice for esthetic reasons. They may be recommendedfor patients who do not accept clasps in framework dentures, but cannot afford dentures supported withprecise elements or implant-based fixed appliances...
July 31, 2018: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29959287/effect-of-surface-treatments-and-adhesive-materials-on-the-shear-bond-strength-of-artificial-denture-teeth-to-denture-base-resins
#2
Abdulelah M BinMahfooz, Osama A Qutub
AIM: The purpose of the current study was intended to evaluate the effect of different surface modifications and different adhesive materials on the shear bond strength of artificial teeth to heat-polymerized and thermoplastic denture base materials using different repair techniques. MATERIALS AND METHODS: Forty cross-linked artificial teeth used to construct different types of acrylic based denture prosthesis were selected to be bonded to two types of denture base materials, heat-polymerized acrylic resin denture base material, and thermoplastic acrylic resin denture base material...
June 1, 2018: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29563441/peek-with-reinforced-materials-and-modifications-for-dental-implant-applications
#3
REVIEW
Fitria Rahmitasari, Yuichi Ishida, Kosuke Kurahashi, Takashi Matsuda, Megumi Watanabe, Tetsuo Ichikawa
Polyetheretherketone (PEEK) is a semi-crystalline linear polycyclic thermoplastic that has been proposed as a substitute for metals in biomaterials. PEEK can also be applied to dental implant materials as a superstructure, implant abutment, or implant body. This article summarizes the current research on PEEK applications in dental implants, especially for the improvement of PEEK surface and body modifications. Although various benchmark reports on the reinforcement and surface modifications of PEEK are available, few clinical trials using PEEK for dental implant bodies have been published...
December 15, 2017: Dentistry journal
https://www.readbyqxmd.com/read/29279765/investigation-of-the-cytotoxicity-of-thermoplastic-denture-base-resins
#4
Jung-Hwan Lee, Soo-Kyung Jun, Si-Chul Kim, Chikahiro Okubo, Hae-Hyoung Lee
PURPOSE: The purpose of this study was to investigate the in vitro cytotoxicity of thermoplastic denture base resins and to identify the possible adverse effects of these resins on oral keratinocytes in response to hot water/food intake. MATERIALS AND METHODS: Six dental thermoplastic resin materials were evaluated: three polyamide materials (Smile tone, ST; Valplast, VP; and Luciton FRS, LF), two acrylic materials (Acrytone, AT; and Acryshot, AS), and one polypropylene resin material (Unigum, UG)...
December 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29238483/the-influence-of-polishing-techniques-on-pre-polymerized-cad-cam-acrylic-resin-denture-bases
#5
Manal Rahma Alammari
Background: Lately, computer-aided design and computer-aided manufacturing (CAD/CAM) has broadly been successfully employed in dentistry. The CAD/CAM systems have recently become commercially available for fabrication of complete dentures, and are considered as an alternative technique to conventionally processed acrylic resin bases. However, they have not yet been fully investigated. Objective: The purpose of this study was to inspect the effects of mechanical polishing and chemical polishing on the surface roughness (Ra) and contact angle (wettability) of heat-cured, auto-cured and CAD/CAM denture base acrylic resins...
October 2017: Electronic Physician
https://www.readbyqxmd.com/read/29029849/impact-of-the-heating-quenching-process-on-the-mechanical-optical-and-thermodynamic-properties-of-polyetheretherketone-peek-films
#6
Lisa Bodden, Nina Lümkemann, Valerie Köhler, Marlis Eichberger, Bogna Stawarczyk
OBJECTIVE: The aim of this study was to investigate the impact of a heating/quenching process on the optical, mechanical and thermodynamic properties of filled (20%_4000) and unfilled PEEK films (0%_2000 and 0%_4000). Heating/quenching was performed to simulate thermoforming as possible method to process thermoplastic polymers for dental application. METHODS: For the investigation, films of different PEEK qualities (0%_2000, 0%_4000, 20%_4000) were produced using isostatic pressing (n=10/quality)...
December 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28777510/the-historical-evolution-of-dental-impression-materials
#7
Ioannis Papadiochos, Sofia Papadiochou, Ioannis Emmanouil
The concept of impression making process in dentistry began in the mid 1800s. Dentists realized that the construction of a prosthetic restoration required both a detailed capture of the oral tissues along with stone cast fabrications. To accomplish these goals, impression materials were essential. Beeswax represents the first impression material, while important bechmarks during the historical evolution of dental impression materials are considered to be the introduction of dental trays in the early 1800s and the invention of the gutta-percha, thermoplastic resins and plaster of Paris...
July 2017: Journal of the History of Dentistry
https://www.readbyqxmd.com/read/28533807/malignant-soft-tissue-sarcoma-of-the-shoulder-treated-by-surface-mould-brachytherapy-boost-in-an-adjuvant-setting
#8
Ashutosh Mukherji, Mourougan Sinnatamby
PURPOSE: Soft tissue sarcomas of the extremities account for half of all soft tissue sarcomas. Radiotherapy and surgery have been the standard modalities in the treatment of this type of cancer. Brachytherapy can be used as the sole therapy, if the target volume is localized and easily accessible. This work reports three cases of shoulder soft tissue sarcomas with positive deep resected margins, treated with a combination of external beam radiotherapy and surface mould brachytherapy boost technique...
April 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28513977/use-of-high-performance-polymers-as-dental-implant-abutments-and-frameworks-a-case-series-report
#9
Mohammad Al-Rabab'ah, Wala'a Hamadneh, Ismail Alsalem, Ameen Khraisat, Ashraf Abu Karaky
Dental implant abutments can be made of different materials including titanium, gold, zirconia, alumina, and polymeric materials. Polyetheretherketone (PEEK) is a high performance thermoplastic polymer that can be used as a dental implant abutment material. It has an elastic modulus comparable to bone and can reduce stress shielding. PEEK is a radiolucent material that can allow better radiographic imaging of peri-implant tissues and can be veneered with composite materials or bonded to ceramics. PEEK is widely used in orthopedic and spinal surgeries, and it possesses mechanical and biological characteristics that encourage its use as dental implant abutments...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28386008/high-performance-vitrimers-from-commodity-thermoplastics-through-dioxaborolane-metathesis
#10
Max Röttger, Trystan Domenech, Rob van der Weegen, Antoine Breuillac, Renaud Nicolaÿ, Ludwik Leibler
Windmills, cars, and dental restoration demand polymer materials and composites that are easy to process, assemble, and recycle while exhibiting outstanding mechanical, thermal, and chemical resistance. Vitrimers, which are polymer networks able to shuffle chemical bonds through exchange reactions, could address these demands if they were prepared from existing plastics and processed with fast production rates and current equipment. We report the metathesis of dioxaborolanes, which is rapid and thermally robust, and use it to prepare vitrimers from polymers as different as poly(methyl methacrylate), polystyrene, and high-density polyethylene that, although permanently cross-linked, can be processed multiple times by means of extrusion or injection molding...
April 7, 2017: Science
https://www.readbyqxmd.com/read/28280726/developing-customized-dental-miniscrew-surgical-template-from-thermoplastic-polymer-material-using-image-superimposition-cad-system-and-3d-printing
#11
Yu-Tzu Wang, Jian-Hong Yu, Lun-Jou Lo, Pin-Hsin Hsu, CHun-Li Lin
This study integrates cone-beam computed tomography (CBCT)/laser scan image superposition, computer-aided design (CAD), and 3D printing (3DP) to develop a technology for producing customized dental (orthodontic) miniscrew surgical templates using polymer material. Maxillary bone solid models with the bone and teeth reconstructed using CBCT images and teeth and mucosa outer profile acquired using laser scanning were superimposed to allow miniscrew visual insertion planning and permit surgical template fabrication...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28216850/versatility-of-peek-as-a-fixed-partial-denture-framework
#12
Nikita Sinha, Nidhi Gupta, K Mahendranadh Reddy, Y M Shastry
Materials used for fixed partial denture (FPD) frameworks have had properties of excellent strength, durability, and biocompatibility. Some of the materials which have been used till date include alloys, ceramics, and high-performance polymers such as zirconia, Ni-Cr, lithium disilicate, and so on. All these, though excellent, have their advantages and disadvantages. Hence, the search has always been on for a better material. One such material, which has made its foray into dentistry in the recent times, is polyetheretherketone (PEEK)...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28190814/effect-of-fiber-content-on-flexural-properties-of-glass-fiber-reinforced-polyamide-6-prepared-by-injection-molding
#13
Manamu Nagakura, Yasuhiro Tanimoto, Norihiro Nishiyama
The use of non-metal clasp denture (NMCD) materials may seriously affect the remaining tissues because of the low rigidity of NMCD materials such as polyamides. The purpose of this study was to develop a high-rigidity glass fiber-reinforced thermoplastic (GFRTP) composed of E-glass fiber and polyamide-6 for NMCDs using an injection molding. The reinforcing effects of fiber on the flexural properties of GFRTPs were investigated using glass fiber content ranging from 0 to 50 mass%. Three-point bending tests indicated that the flexural strength and elastic modulus of a GFRTP with a fiber content of 50 mass% were 5...
July 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/27608354/a-cheap-fix-for-an-expensive-problem-the-use-of-a-thermoplastic-mouthguard-to-reduce-the-risk-of-dental-trauma-during-orotracheal-intubation
#14
LETTER
E B Bowcock, P Goonan
No abstract text is available yet for this article.
September 2016: Anaesthesia and Intensive Care
https://www.readbyqxmd.com/read/27487533/-upgrading-of-complete-removable-prosthetic-appliance-of-stomatological-patients-by-the-use-of-new-base-materials
#15
Виталий С Кузь, Валентин Н Дворник, Александра И Тесленко, Гельфира М Кузь, Игорь Н Мартыненко
INTRODUCTION: The effectiveness of orthopedic treatment of edentulous patients depends on the properties of the basic materials. The main group of materials for manufacturing of such structures are acrylic plastics of thermal polymerization. However, many years of experience in the use of plastics has revealed a number of shortcomings. One of the main is insufficient functional durability of prostheses, and as a consequence - the fragility of acrylic constructions. At present, more and more dentists use nonacrylic thermoplastics, which can improve the functional quality of full removable dentures, as well as, avoid the above disadvantages of acrylic basic plastic...
2016: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/27479925/evaluation-of-the-ability-of-acinetobacter-baumannii-to-form-biofilms-on-six-different-biomedical-relevant-surfaces
#16
C Greene, J Wu, A H Rickard, C Xi
UNLABELLED: The human opportunistic pathogen, Acinetobacter baumannii, has the propensity to form biofilms and frequently cause medical device-related infections in hospitals. However, the physio-chemical properties of medical surfaces, in addition to bacterial surface properties, will affect colonization and biofilm development. The objective of this study was to compare the ability of A. baumannii to form biofilms on six different materials common to the hospital environment: glass, porcelain, stainless steel, rubber, polycarbonate plastic and polypropylene plastic...
October 2016: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/27069697/management-of-oehler-s-type-iii-dens-invaginatus-using-cone-beam-computed-tomography
#17
Jaya Ranganathan, Mohan Kumar Rangarajan Sundaresan, Srinivasan Ramasamy
Dens Invaginatus is a dental malformation that poses diagnostic difficulties in the clinical context. This anomaly may increase the risk of pulp disease and can potentially complicate endodontic procedure due to the aberrant root canal anatomy. Compared to conventional radiographs, three-dimensional images obtained with Cone Beam Computed Tomography (CBCT) are invaluable in the diagnosis of the extent of this anomaly and in the appropriate treatment planning. Oehler's classification (1957) for Dens Invaginatus (DI) into three types depending on the depth of the invagination has been used for treatment planning...
2016: Case Reports in Dentistry
https://www.readbyqxmd.com/read/27051216/dentistry-to-the-rescue-of-missing-children-a-review
#18
REVIEW
Nitika Vij, Gulsheen Kaur Kochhar, Sanjay Chachra, Taranjot Kaur
Today's society is becoming increasingly unsafe for children: we frequently hear about new incidents of missing children, which lead to emotional trauma for the loved ones and expose systemic failures of law and order. Parents can take extra precautions to ensure the safety of their children by educating them about ways to protect themselves and keep important records of the child such as updated color photographs, fingerprints, deoxyribonucleic acid (DNA) samples, etc., handy. However, in spite of all efforts, the problem of missing children still remains...
January 2016: Journal of Forensic Dental Sciences
https://www.readbyqxmd.com/read/26999889/chemical-and-mechanical-characteristics-of-contemporary-thermoplastic-orthodontic-materials
#19
COMPARATIVE STUDY
Alexandros Alexandropoulos, Youssef S Al Jabbari, Spiros Zinelis, Theodore Eliades
AIM: The aim of the present study was to characterise the chemical and mechanical properties of contemporary thermoplastic orthodontic materials. MATERIALS AND METHODS: Four thermoplastic materials were tested: Clear Aligner (Scheu-Dental), ACE and A+ (Dentsply), and Invisalign (Align Technology). Eight appliances were fabricated from each material and a small portion from each was analysed by ATR-FTIR spectroscopy. The appliances were cut and, following metallographic grinding and polishing, were subjected to instrumented indentation testing (IIT) employing a Vickers indenter...
November 2015: Australian Orthodontic Journal
https://www.readbyqxmd.com/read/26981606/mechanical-properties-of-orthodontic-thermoplastics-petg-pc2858-after-blending
#20
COMPARATIVE STUDY
Yan Song Ma, Dong Yu Fang, Ning Zhang, Xue Jia Ding, Kun Ya Zhang, Yu Xing Bai
OBJECTIVE: To characterise and compare the tensile characteristics after multi-proportional blending, to determine the proper blending ratio for new thermoplastic material and to compare its mechanical performance with commercial thermoplastics. METHODS: PETG and PC2858 aggregates were blended in five different ratios. Standard specimens of each ratio were molded and tested to determine their mechanical performance. Then the new material with the proper blending ratio was chosen and compared against commercial thermoplastics...
March 2016: Chinese Journal of Dental Research
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