scholarly journals JUSTIFICATION OF THE APPLICATION OF CONSTRUCTION MATERIALS IN THE PHENOMENA OF INTOLERANCE TO ACRYLATES

2021 ◽  
Vol 16 (4) ◽  
pp. 35-39
Author(s):  
Konstantin Sarkisyan ◽  
Sergey Zholudev ◽  
Milana Sarkisyan
Keyword(s):  
Dental Materials ◽  
Construction Materials ◽  
Base Material ◽  
Orthopedic Treatment ◽  
Systematic Analysis ◽  
Literary Sources ◽  
Scientific Papers ◽  
Light Curing ◽  
Thermoplastic Resins ◽  
Free Monomer

Introduction. Today, for the manufacture of prostheses with a plastic base, hot polymerization acrylic plastic is most often used, which contains a free monomer — methyl methacrylate. However, in some patients, after their placement in the oral cavity, as a result of orthopedic treatment, various clinical pathological manifestations may occur, which in general are defined as individual intolerance to dental materials. The aim is to carry out a systematic analysis of domestic and foreign literary sources to determine the most suitable base material in patients with intolerance to structural materials. Methodology. The research was carried out on the basis of the search for scientific papers, in the electronic scientific library elibrary.ru for the last 15 years, as well as in the search engines PubMed, Scopus and Wiley Inter Science for 2009–2020. The search was carried out by keywords. Results. The article analyzes the literature data indicating the importance of the choice of the base material in the pathogenesis of intolerance to dental materials. During the analysis of the literature, the positive properties of a new, alternative light-curing base material, which can be used in patients with acrylate intolerance, have been substantiated. Conclusions. The results obtained, in the course of the literature analysis, allow us to highlight the advantages of using a light-curing base material in comparison with acrylic plastics and thermoplastic resins. The results of the use of the light-curing base material in clinical practice will be communicated by us to the dental community in subsequent publications.

New Lightweight Construction Material: Cellular Mat Using Recycled Plastic

2013 ◽  
Vol 594-595 ◽  
pp. 503-510
Author(s):  
T.I.T. Noor Hasanah ◽  
D.C. Wijeyesekera ◽  
Ismail bin Bakar ◽  
Wahab Saidin
Keyword(s):  
Cellular Structure ◽  
Construction Material ◽  
Construction Materials ◽  
Base Material ◽  
Social Benefit ◽  
The Body ◽  
Lightweight Construction ◽  
Ground Condition ◽  
Application Specific ◽  
Design And Construction

Applications of lightweight construction materials enable the design and construction in challenging, difficult and demanding scenarios. Construction materials with enhanced stiffness as in sandwich panels, large portable structures and floating foundations are examples of such materials. The advent of cellular structure technology has actively introduced innovation and enabled design and construction, meeting engineering requirements such as in the construction of the body of air crafts. Cellular mat structures present in the minimum, triple benefits in being lightweight, load sharing and minimising non-uniform deformation. This paper further explores the use of recycled plastic waste as the base material for an innovative geomaterial. The combination of cellular structure, mat structure and use of recycled waste material is a desirable development in manufacturing. Paper also outlines the techno social benefit of adopting such material in construction. Other application-specific benefits related to cellular mats are those like noise reduction, energy absorption, thermal insulation, mechanical damping. This paper specifically presents the development of a new multifunctional lightweight material is been proposed as an invective innovation for highway construction on challenging ground condition.

scholarly journals ANALYSIS OF PATIENTS’ EXAMINATION WITH UNSATISFACTORY ORTHOPEDIC TREATMENT RESULTS OF HARD TISSUES OF TEETH AND DENTAL ROWS OF NON-REMOVABLE DENTURES

2018 ◽  
pp. 38-43
Author(s):  
I.N. Yarina
Keyword(s):  
Dental Materials ◽  
Physiological Adaptation ◽  
Orthopedic Treatment ◽  
Dental Patients ◽  
Results Of Treatment ◽  
Prophylactic Measures ◽  
Short Period ◽  
Hard Tissues ◽  
Intermediate Part

Nowadays, the problem of prosthetic with non-removable orthopedic structures is quite common and is widely described in domestic and foreign literature. Prosthetics of non-removable structures of prosthetics has a number of advantages: complete rehabilitation of biting function, chewing efficiency, aesthetic norm of a smile. Invisible prosthesis designs, usually small in size, have a short period of psychological and physiological adaptation, which has a good reflection on their long-term use by the patient. The examination of dental patients in the clinic of orthopedic dentistry with unsatisfactory results of prosthetic dentures after 5 years with orthopedic treatment allowed to highlight the main indicators of inapplicability regarding the further use of dentures in terms of biocompatibility, mechanical strength and aesthetic properties. The main aim of the study was to improve the quality of patients’ treatment by identifying the causes of treatment complications by an orthopedist using the method of comparative analysis during the examination of patients with unsatisfactory results of dentures using permanent dentures. To identify the causes of complications of orthopedic treatment, a clinical examination of patients with unsatisfactory results of treatment with permanent constructions of dentures on a cast base was performed. The criteria for evaluation were the following indicators: bad breath, gums pain and bleeding, pain and mobility of the supporting teeth, pain under the intermediate part, metallic taste, pain in the blood vessel, darkening of the lining, chipping the lining, obscuring gums, excessive abrasion, and cleavage. From anamnesis and records in the history of the disease, the period of difficulty was determined. Our research results indicate that a significant part of ineffective treatment is due to the wrong choice of auxiliary and structural materials. Given that the choice of materials is performed arbitrarily, in almost half of cases, taking into account the wishes of patients and their financial capabilities, including the physical, mechanical and clinical and technological characteristics of dental materials, in our opinion, it is necessary to create a computer model of rational choice of material, therapeutic and prophylactic measures to improve the effectiveness of orthopedic treatment for patients with defects in hard tissues of teeth and dentition with non-removable structures. The complex of the following studies will allow the orthopedic dentist to continue improving the quality of patients’ treatment at the clinical stages of treatment with non-removable dentures.

scholarly journals Assessment of monomer release from 3 different fissure sealants

2017 ◽  
Vol 16 (2) ◽  
pp. 90-96
Author(s):  
K. Görkem Ulu Güzel ◽  
Işıl Sönmez
Keyword(s):  
High Performance ◽  
Dental Materials ◽  
Plasma Arc ◽  
Fissure Sealants ◽  
Fissure Sealant ◽  
Polymerization System ◽  
Light Curing ◽  
Power Mode ◽  
Curing Light

Background: Light-activated resin-based dental fissure sealants are the most widely accepted among clinicians. The objective of this study was to determine monomer release of 3 different light-curing fissure sealants in vitro: Control Seal (Voco, Germany), Fissurit FX (Voco, Germany) and R&D Series Fıssured Nova (Imicrly, Turkey). Methods: Each material was polymerized with a curing light: Valo Cordless (Ultradent) LED in standard mode for 20 seconds (n = 27) and 40 seconds (n = 27) and in Xtra power mode (plasma arc) for 3 seconds (n = 27). High-performance liquid chromatography (HPLC) was used to measure the amount of monomers released over 1, 3 and 7 days. Results: Plasma arc groups showed the highest release of monomers at 1, 3 and 7 days in the 3 fissure sealant groups (p<0.001). The greatest release of bisphenol A glycidyl methacrylate (bis-GMA) determined for R&D Series Fissured Nova both with LED 20 seconds and LED 40 seconds and for Control Seal was with the plasma arc. With time, release of the monomer was reduced for all polymerization systems. Conclusions: Efficiency of the polymerization system and applying the recommended curing time for light-activated resin-based dental materials are very important to protect the patient from potential hazards of residual monomers.

scholarly journals Effect of Implantation and Construction Dental Materials on Fibroblast Cell Culture

2017 ◽  
Vol 2 (1) ◽  
pp. 459
Author(s):  
V.N. Olesova ◽  
N.A. Uzunyan ◽  
M.R. Filonov ◽  
F.G. Shumakov ◽  
Y.A. Povstyanko
Keyword(s):  
Cell Culture ◽  
Experimental Study ◽  
Polymethyl Methacrylate ◽  
Human Fibroblasts ◽  
Dental Materials ◽  
Fibroblast Cell ◽  
Cobalt Alloy ◽  
Negative Effect ◽  
Light Curing ◽  
Fibroblast Cell Culture

An experimental study of biocompatibility of the basic prosthetic materials in the cell culture of human fibroblasts was performed. It revealed a negative effect on the morphology of the cells of chromium-cobalt alloy, the material for overdentures based on polymethyl methacrylate, the light-curing composite.

scholarly journals Methodology of scientific researches: methods of searching and processing of scientific information

2020 ◽  
Vol 1 (189) ◽  
pp. 59-62
Author(s):  
Liliia Rebukha ◽  
Keyword(s):  
Scientific Information ◽  
Scientific Research ◽  
Scientific Work ◽  
Scientific Paper ◽  
Professional Activity ◽  
Main Task ◽  
Sources Of Information ◽  
Systematic Analysis ◽  
Additional Information ◽  
Literary Sources

The methodology as the doctrine of the organization of professional activity, which is characterized by a minimum content and maximum coverage of essential connections and relationships, is characterized in the article. The valuable significance of the methodology of scientific researches, which consists in the delineation of the established features, the formation of the structure, the identification of forms, mechanisms and conditions for the implementation of scientific research, is indicated. The effectiveness of scientific research, which largely depends on the timely provision of information about new advances in science and the effective use of this information for scientific and research purposes, is revealed. The typology of division of all sources of information used in the preparation of written works into printed sources of information is revealed and specialized informative-retrieval systems, electronic sources of information is determined. The most important technological procedure in the methodology of scientific research is the collection of sources of information and their systematization. The main task of systematization is to organize and group all the collected material on the content and sequence of its use in the preparation of scientific work. The main functions of the systematic analysis are characterized: implementation of careful check of completeness of selection of literary sources; implementation of verification of compliance of the source data of the used sources. It is revealed that the selection and evaluation of factual material for writing a scientific work is a scientific work that requires purposeful individual effort, personal perseverance and motivated desire. Scientific creativity is manifested in the selection and processing of a significant amount of basic and additional information, its generalization and presentation in a form that is convenient for analysis and writing conclusions. It is concluded that the proposed methodological activity facilitates the methods of scientific research and is necessary throughout the time of writing a scientific paper.

scholarly journals Due to intolerance of dental materials used for therapeutic treatment

2020 ◽  
Vol 3 (11) ◽  
pp. 160-162
Author(s):  
O. A. Razhabov ◽  
Khaуitova M. A ◽  
Usmonov N. U.
Keyword(s):  
Dental Materials ◽  
Ceramic Materials ◽  
Palladium Alloys ◽  
Cobalt Chromium ◽  
Orthopedic Treatment ◽  
Filling Materials ◽  
Clinical Observations ◽  
Materials Used ◽  
Silver Palladium

     Long-term clinical observations show that widely used dentures made of metals and their alloys are not indifferent, cause a number of diseases of the oral mucosa, and have social and medical consequences in the form of intolerance to dental prosthesis materials[1,2]. Currently, ceramic materials, plastics, stainless steels, cobalt-chromium, silver-palladium alloys, gold-based alloys, platinum, etc. are used for orthopedic treatment. these alloys include the following metals: iron, chromium, Nickel, titanium, manganese, silicon, molybdenum, cobalt, palladium, zinc, silver, gold, etc. Signs of intolerance may occur when placing dentures and filling materials in the oral cavity. Intolerance to prosthetic materials can be caused by different reasons that have different mechanisms of pathology development. Solving problems with intolerance to dental materials in each patient requires analysis together with a dentist, an immunologist, and an immunological laboratory [1-4].

scholarly journals PHYSICAL REHABILITATION OF SCHOOL-AGED CHILDREN WITH MYOPIA OF І–ІІІ DEGREE

2019 ◽  
Author(s):  
Olesya Tymchyk
Keyword(s):  
Physical Rehabilitation ◽  
Myopia Progression ◽  
School Aged Children ◽  
Russian Scientific ◽  
Horizontal Diameter ◽  
Literary Sources ◽  
Scientific Papers ◽  
Positive Effect ◽  
Corneal Thinning

Physical rehabilitation of children with myopia is a difficult process and requires a long-term, systematic and stage-by-stage use of a complex of means for restoration acuity of vision. Kinesiotherapy (respiration and twist exercises), finger and articulatory gymnastics, methods of Onnuri Therapy, reflexotherapy, instrumental physiotherapy, etc. are usually used for this, and that taken together leads to the positive effect and restoration of visual system. Nevertheless, in progressive forms of myopia these physical methods are not always effective. The objective – theoretical justification of the necessity and the essence of physical rehabilitation during myopia, analysis and summation of list of research and methodological literature concerning the study of influence of physical rehabilitation on physical development and psychoemotional state of pupils with myopia of various degrees. Methods. Sources of literature (scientific papers, textbooks, manuals, synopses of thesis works) chosen from the electronic database of the Vernadsky National Library of Ukraine, Russian scientific electronic library «eLibrary», Web of Science, PubMed, PEDro, etc. Results. On the basis of literary sources, it has been established that the increase in number of cases of myopia of pupils is, in the first place, connected with the increase in visual loadings. The main pathogenic link of the acquired myopia is sclera distension. Children affected by the acquired myopia have a combination of corneal thinning and the increase of its horizontal diameter and the length of the anterior-posterior axis of the eye that indicates the distension of the eye cornea. The corneal thinning is accompanied by its sensory decrement from 19 % to 57 % depending on the degree of the disease and by the decrease of the rigidity of the outer layer of the eye. The corneal thinning is one of the objective criteria of myopia progression, that involves inclusion of keratopachymetry to the complex of obligatory examinations of myopia patients for defining a rational therapeutic approaches. Children with myopia with corneal thinning form a risk group in regard to the development of retinal degeneration. Conclusions. Myopia is a current medical and social problem of the present. Physical rehabilitation of such children is a difficult and long-term process, which requires a systematic and stage-by-stage use of its various means.

‘Let there be Light,’ and there was Light, but was it Enough? A Review of Modern Dental Light Curing

Dental Update ◽  
2021 ◽  
Vol 48 (8) ◽  
pp. 633-640 ◽  
Author(s):  
Stephen J Bonsor ◽  
William M Palin
Keyword(s):  
Clinical Relevance ◽  
Best Practice ◽  
Clinical Performance ◽  
Dental Materials ◽  
Common Method ◽  
Basic Knowledge ◽  
Light Curing ◽  
Key Aspects

Light curing, or photopolymerization, is a very common method of effecting the set of resin-containing dental materials. This review summarizes key aspects that influence optimal photopolymerization, and how both a basic knowledge of chemistry and properties of the light-curing device are essential to achieve optimal clinical performance of the material. Tips are offered with respect to both the light-curing units and those materials which are cured by them to ensure best practice when working clinically. CPD/Clinical Relevance: A thorough knowledge and understanding of photopolymerization is critical to clinicians given that many dental materials in contemporary use are cured by this means.

scholarly journals Effects of Light Curing Method and Exposure Time on Mechanical Properties of Resin Based Dental Materials

2008 ◽  
Vol 02 (01) ◽  
pp. 37-42 ◽  
Author(s):  
A. Rıza Alpöz ◽  
Fahinur Ertuḡrul ◽  
Dilsah Cogulu ◽  
Aslı Topaloḡlu Ak ◽  
Metin Tanoḡlu ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Light Source ◽  
Exposure Time ◽  
Resin Composite ◽  
Dental Materials ◽  
Glass Ionomer Cement ◽  
Curing Time ◽  
Uniform Size ◽  
Halogen Light ◽  
Light Curing

ABSTRACTObjectives: The aim of this study was to investigate microhardness and compressive strength of composite resin (Tetric-Ceram, Ivoclar Vivadent), compomer (Compoglass, Ivoclar, Vivadent), and resin modified glass ionomer cement (Fuji II LC, GC Corp) polymerized using halogen light (Optilux 501, Demetron, Kerr) and LED (Bluephase C5, Ivoclar Vivadent) for different curing times.Methods: Samples were placed in disc shaped plastic molds with uniform size of 5 mm diameter and 2 mm in thickness for surface microhardness test and placed in a diameter of 4 mm and a length of 2 mm teflon cylinders for compressive strength test. For each subgroup, 20 samples for microhardness (n=180) and 5 samples for compressive strength were prepared (n=45). In group 1, samples were polymerized using halogen light source for 40 seconds; in group 2 and 3 samples were polymerized using LED light source for 20 seconds and 40 seconds respectively. All data were analyzed by two way analysis of ANOVA and Tukey’s post-hoc tests.Results: Same exposure time of 40 seconds with a low intensity LED was found similar or more efficient than a high intensity halogen light unit (P>.05), however application of LED for 20 seconds was found less efficient than 40 seconds curing time (P=.03).Conclusions: It is important to increase the light curing time and use appropriate light curing devices to polymerize resin composite in deep cavities to maximize the hardness and compressive strength of restorative materials. (Eur J Dent 2008;2:37-42)

scholarly journals What factors contribute to high mechanical strength of tabia? Case study of the tabia from coastal forts sites at Zhejiang, China

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Cuisong Zhang ◽  
Bingjian Zhang ◽  
Biao Cui ◽  
Guocong Lin
Keyword(s):  
Compressive Strength ◽  
Construction Materials ◽  
Component Composition ◽  
Sand Particle ◽  
Systematic Analysis ◽  
Hydrated Calcium Silicate ◽  
Physiochemical Properties ◽  
High Compressive Strength ◽  
Coastal Defense

Abstract Tabia is one of the most widely used construction materials in ancient China. In this work, the tabia samples from three coastal defense fort sites at Zhejiang Province, China, we analyzed to determine their component composition and physiochemical properties. The results show that these tabia samples exhibited high compressive strength, which could be as high as 4–9 MPa. Furthermore, the systematic analysis demonstrated that the high compressive strength was related to the following factors: (1) a suitable mass ratio of sand, lime, and clay; (2) an appropriate sand particle size ratio; and (3) the formation of hydrated calcium silicate (C-S-H). Moreover, sticky rice was also detected in the tabia samples. These findings are fundamentally important, which could be beneficial to further study of the craftsmanship of the coastal defense forts and could further provide essential guidance for the protection and restoration of the tabia relics.

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