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Dental Thermoplastic

Bun San Chong, Manpreet Dhesi, Jimmy Makdissi
OBJECTIVES: To investigate the novel use of computer-aided dynamic navigation for guided endodontics. METHOD AND MATERIALS: Dental casts were fabricated from sets of extracted human teeth. A cone beam computed tomography (CBCT) scan of each cast, with a molded thermoplastic stent and a radiographic marker attached, was obtained and imported into the planning software of a dynamic navigation implant surgery system. Simulating implant surgery but for guided endodontics, the drilling entry point, angle, pathway, and depth of virtual implants were planned for 29 selected teeth...
2019: Quintessence International
Alex Leo Sequeira, Aparna I Narayan, Vinu Thomas George
STATEMENT OF PROBLEM: Variation in the baseline mechanical properties of polyamide thermoplastic polymers used in the fabrication of prosthetic dental appliances and the effects of nonaldehyde disinfectants on the mechanical properties of these polymers are unclear. PURPOSE: The purpose of this in vitro study was to compare the flexural and impact strengths of 2 flexible denture materials (Valplast and Sunflex) and evaluate the effect of 24-hour immersion in nonaldehyde disinfectant (Perform) on their flexural and impact strengths...
January 4, 2019: Journal of Prosthetic Dentistry
Theodore V Tso, Martina Hurwitz, Danielle N Margalit, Sang J Lee, Christopher L Williams, Evan B Rosen
STATEMENT OF PROBLEM: Electron backscatter radiation from dental materials can contribute to soft tissue injury in patients undergoing head and neck radiation therapy. PURPOSE: The dose enhancement from the materials used for prosthodontic restoration of the dentition has not been well quantified. This study reports the magnitude of backscatter dose from the contemporary dental materials lithium disilicate and zirconia as compared with high-noble alloy and investigates the role of a spacer material in mitigating this effect...
December 20, 2018: Journal of Prosthetic Dentistry
Luigi V Stefanelli, Bradley S DeGroot, David I Lipton, George A Mandelaris
PURPOSE: To evaluate the in vivo accuracy of dental implants placed using a dynamic computer-aided dental implant (CAI) navigation system. The impact of various factors on accuracy was also analyzed. MATERIALS AND METHODS: A retrospective, in vivo study was performed during the period of October 2015 to December 2017. Data were obtained on all implants placed during this time frame. A chart review was conducted to identify the type of flap, number of implants placed, number of patients treated, and factors related to the description of edentulism (partial or complete)...
December 5, 2018: International Journal of Oral & Maxillofacial Implants
Mostafa I Fayad, Hussam Hakem T Alruwaili, Muhammad Sartaj Khan, Muhammad Nadeem Baig
Aim: The aim of this study is to evaluate the maximum bite force (MBF) with different denture base materials in completely edentulous patients. Materials and Methods: MBF was evaluated in randomly selected 100 completely edentulous patients. Patients were selected from the Outpatient Clinic, College of Dentistry, Aljouf University, Saudi Arabia. The patients were randomly divided into two equal groups: Group I (control group): Patient received a conventional heat-cured acrylic complete denture (Vertex™ Regular, Vertex-Dental B...
September 2018: Journal of International Society of Preventive & Community Dentistry
Benedikt C Spies, Matthias Petsch, Ralf-Joachim Kohal, Florian Beuer
Several attachment systems for implant-supported removable dental prostheses (ISRDPs) are currently available. The bar attachment option includes cast or milled alloyed male and female parts. Replaceable slide attachments made from elastic materials can be inserted into the female part of the bar to counter loss of friction that develops due to wear. Another approach involves milling the female part from organic thermoplastic polymers. In the present case history report, an edentulous maxilla was restored with a digitally fabricated ISRDP with the female part of the bar milled from polyether ether ketone (PEEK) polymerized into a zirconia framework...
September 2018: International Journal of Prosthodontics
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
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
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
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
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
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
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
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
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
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
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
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
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
E B Bowcock, P Goonan
No abstract text is available yet for this article.
September 2016: Anaesthesia and Intensive Care
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