scholarly journals The relationship between patient's participation in shade selection and their satisfaction with their dental prostheses

2021 ◽  
Author(s):  
Faisal Alzeghaibi ◽  
Abdulaziz Jammah ◽  
Faisal Alghanim ◽  
Khalid Albawardi ◽  
Lubna Alkadi
Keyword(s):  
Dental Prostheses ◽  
The Relationship ◽  
Shade Selection

EVALUATION OF THE EFFECTIVENESS OF THERAPEUTIC AND PREVENTIVE MEASURES OF DYSBIOSIS IN DENTAL PRACTICE

2020 ◽  
pp. 78-88
Author(s):  
Жанна Владимировна Вечеркина ◽  
Наталья Александровна Шалимова ◽  
Наталия Владимировна Чиркова ◽  
Елена Анатольевна Андреева ◽  
Марина Николаевна Бобешко
Keyword(s):  
Oral Cavity ◽  
Point Of View ◽  
Control Group ◽  
Difficult Situation ◽  
Dental Prostheses ◽  
Oral Microflora ◽  
Removable Plate ◽  
Gastrointestinal Dysbiosis ◽  
The Relationship

Увеличивающаяся тенденция нуждаемости пациентов использования несъемных, съемных зубных протезов, ортодонтических и челюстно-лицевых апппаратов, наблюдающаяся в последние годы, сопряжена с многими проблемами. Использующиеся в практике ортопедической стоматологии зубные протезы и аппараты оказывают побочное действие на слизистую оболочку полости рта (механическое, химико-токсическое, сенсибилизирующее), что приводит к нарушению биоценоза, чрезмерному росту патогенных микроорганизмов и увеличению числа дрожжевых колоний. Установлено также, что при использовании адгезивных препаратов для улучшения фиксации съемных протезов статистически достоверно увеличивается число дрожжевых колоний при количественном посеве по сравнению с контрольной группой пациентов. Еще более сложная ситуация наблюдается у пациентов, уже имеющих хроническое нарушение соотношения нормальной и условно - патогенной микробиоты и нуждающихся в протезировании съемными пластиночными протезами. Эти пациенты, как правило, имеют неудовлетворительную гигиену полости рта и тяжелую сопутствующую патологию, чаще всего сахарный диабет или дисбактериоз ЖКТ. В настоящее время получены убедительные данные о важной роли иммунных нарушений в патогенезе развития кандидоинфекции и антифунгальной резистентности. В частности, дисфункции клеточного звена иммунной системы, что способствует хроническому, рецидивирующему и зачастую торпидному к терапии течению заболевания. Это, в свою очередь, требует выполнения научных исследований в направлении коррекции состояния микрофлоры ротовой полости пользующихся ортопедическими конструкциями. Данная обзорная работа посвящена актуальным на сегодняшний день вопросам применения пре-, пробиотических культур и синбиотиков в комплексном лечении больных с дисбиотическим изменением полости рта, пользующихся ортодонтическими конструкциями, лечебно-диагностическими аппаратами. Целью работы стал всесторонний анализ проблемы целесообразности и эффективности использования вышеназванных средств с точки зрения этиопатогенеза дисбиоза в полости рта The increasing trend of patients ' need to use non-removable, removable dentures, orthodontic and maxillofacial devices, observed in recent years, is associated with many problems. Dental prostheses and devices used in the practice of orthopedic dentistry have a side effect on the oral mucosa (mechanical, chemical-toxic, sensitizing), which leads to a violation of the biocenosis, excessive growth of pathogenic microorganisms and an increase in the number of yeast colonies. It was also found that the use of adhesive preparations to improve the fixation of removable prostheses statistically significantly increases the number of yeast colonies during quantitative seeding compared to the control group of patients. An even more difficult situation is observed in patients who already have a chronic violation of the relationship between normal and opportunistic microbiota and need prosthetics with removable plate prostheses. These patients usually have poor oral hygiene and severe comorbidities, most often diabetes mellitus or gastrointestinal dysbiosis. Currently, there is strong evidence of the important role of immune disorders in the pathogenesis of Candida infection and antifungal resistance. In particular, dysfunction of the cellular link of the immune system, which contributes to the chronic, recurrent and often torpid to therapy course of the disease. This, in turn, requires scientific research in the direction of correlation of the state of the oral microflora using orthopedic structures. This review is devoted to current issues of the use of pre - probiotic cultures and synbiotics in the complex treatment of patients with dysbiotic changes in the oral cavity, using orthodontic structures, medical and diagnostic devices. The aim of the work was a comprehensive analysis of the problem of expediency and effectiveness of the use of the above-mentioned means, from the point of view of the eiopathogenesis of dysbiosis in the oral cavity

scholarly journals Muscle plasticity and hybrid fibers in the masticatory musculature. Literature review

2020 ◽  
pp. 1-11
Author(s):  
Felipe Inostroza
Keyword(s):  
Speech Therapy ◽  
Fiber Type ◽  
Muscle Fibers ◽  
Masticatory Muscles ◽  
Craniofacial Morphology ◽  
Type I ◽  
Hybrid Fibers ◽  
Muscle Plasticity ◽  
Dental Prostheses ◽  
The Relationship

The masticatory musculature is characterized by presenting hybrid fibers that in recent years have been related to the phenomenon of muscle plasticity. The objective of the study was to describe the relationship between muscle plasticity and the hybrid muscle fibers present in the masticatory muscles, through a narrative review. For this, an electronic search was conducted in PUBMED, ScienceDirect and BIREME, using the keywords: “Muscle Plasticity”, “Hybrid Muscle Fibers” and “Hybrid Fibers”. Documents that report the myosin heavy chain (MHC) isoforms present in the masticatory muscles of humans and other mammals were selected, along with the changes linked to functional demands. The presence of type I and type II pure fibers were described, in addition to other isoforms such as MHC-la, MHC-IIM, MHC-fetal and MHC-cardiac. However, a significant percentage of fibers in the masticatory muscles are hybrids, that is, they express more than one MHC isoform, which are also different at the intermuscular and intramuscular level. Local influences can contribute to the variation of fiber type expression. In the chewing muscles, weaning, the hardness of food, bruxism, craniofacial morphology and the use of dental prostheses generate changes at the level of the chewing muscles, where the presence of hybrid fibers is common. The important presence of hybrid fibers in the masticatory muscles and their relationship with muscle plasticity throughout the life cycle, due to functional and pathological changes, is concluded. It is important for Speech Therapy and Myofunctional Therapy to deepen their understanding of the physiology of oromyofunctional behavior.

scholarly journals The relationship between masticatory ability, age, and dental and prosthodontic status in an institutionalized elderly dentate population in Qingdao, China

2018 ◽  
Vol 23 (2) ◽  
pp. 633-640 ◽  
Author(s):  
Qian Zhang ◽  
Dick J. Witter ◽  
Ewald M. Bronkhorst ◽  
Nico H. J. Creugers
Keyword(s):  
Tooth Loss ◽  
Institutionalized Elderly ◽  
Dental Prostheses ◽  
Number Of Teeth ◽  
Masticatory Ability ◽  
Removable Dental Prostheses ◽  
Multiple Regression Models ◽  
Natural Teeth ◽  
The Relationship ◽  
Molar Region

Abstract Objectives To identify relationships between masticatory ability and age, and dental and prosthodontic status amongst an institutionalized elderly dentate population in China. Materials and methods A sample of 512 elders living in eight nursing homes in Qingdao was categorized based on a hierarchical dental functional classification system with and without tooth replacements. Masticatory disability scores (MDSs) were analyzed using multiple regression models with only age, and age and dentition variables for participants having ≥ 10 natural and those having < 10 natural teeth in each jaw. Results Overall, associations between MDS and age, number of teeth, and number of teeth replaced by dental prostheses were identified. For participants having ≥ 10 natural teeth in each jaw, no significant associations between MDS and age and dental and prosthodontic status were found. Participants having < 10 natural teeth in each jaw had higher MDS (increasing chewing difficulties) at higher ages. However, when “premolar region sufficient” and “molar region sufficient” were included, MDS was not associated with age, but with these dentition variables. For participants having ≥ 10 teeth including prosthodontically replaced teeth in each jaw, age was the only variable associated with MDS. For participants having < 10 teeth including teeth replaced in each jaw, the significant factor was “premolar region sufficient.” Overall, lower MDS was associated with increasing number of teeth, as well as with increasing number of teeth replaced by dental prostheses. Conclusions In this population of institutionalized dentate elderly, masticatory ability was significantly associated with dental and prosthodontic status. Clinical relevance For institutionalized elderly, having less than ten natural teeth in each jaw is associated with chewing problems. Most important dentition factor is the presence of three to four premolar pairs. Teeth added by partial removable dental prostheses compensate impaired masticatory ability due to tooth loss for 50% compared to natural teeth.

Interstellar gas in the central region of the Galaxy

1967 ◽  
Vol 31 ◽  
pp. 239-251 ◽  
Author(s):  
F. J. Kerr
Keyword(s):  
Central Region ◽  
Galactic Plane ◽  
Neutral Hydrogen ◽  
Continuum Emission ◽  
Galactic Centre ◽  
Interstellar Gas ◽  
Hydrogen Recombination ◽  
The Galaxy ◽  
Centre Region ◽  
The Relationship

A review is given of information on the galactic-centre region obtained from recent observations of the 21-cm line from neutral hydrogen, the 18-cm group of OH lines, a hydrogen recombination line at 6 cm wavelength, and the continuum emission from ionized hydrogen.Both inward and outward motions are important in this region, in addition to rotation. Several types of observation indicate the presence of material in features inclined to the galactic plane. The relationship between the H and OH concentrations is not yet clear, but a rough picture of the central region can be proposed.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Choosing a Markov blanket

2020 ◽  
Vol 43 ◽  
Author(s):  
Thomas Parr
Keyword(s):  
Markov Blanket ◽  
Target Article ◽  
The Relationship

Abstract This commentary focuses upon the relationship between two themes in the target article: the ways in which a Markov blanket may be defined and the role of precision and salience in mediating the interactions between what is internal and external to a system. These each rest upon the different perspectives we might take while “choosing” a Markov blanket.

Tinkering with cognitive gadgets: Cultural evolutionary psychology meets active inference

2019 ◽  
Vol 42 ◽  
Author(s):  
Paul Benjamin Badcock ◽  
Axel Constant ◽  
Maxwell James Désormeau Ramstead
Keyword(s):  
Evolutionary Psychology ◽  
Research Program ◽  
Active Inference ◽  
Innovative Research ◽  
Cognitive Faculties ◽  
Cultural Evolutionary ◽  
The Relationship

Abstract Cognitive Gadgets offers a new, convincing perspective on the origins of our distinctive cognitive faculties, coupled with a clear, innovative research program. Although we broadly endorse Heyes’ ideas, we raise some concerns about her characterisation of evolutionary psychology and the relationship between biology and culture, before discussing the potential fruits of examining cognitive gadgets through the lens of active inference.

Radiation Damage, Contrast and Statistics in High Resolution Biological Electron Microscopy

1970 ◽  
Vol 28 ◽  
pp. 260-261
Author(s):  
Robert M. Glaeser
Keyword(s):  
High Resolution ◽  
Particle Flux ◽  
Unit Area ◽  
Signal To Noise ◽  
Resolution Image ◽  
High Resolution Image ◽  
Pass Through ◽  
Counting Statistics ◽  
The Relationship ◽  
Picture Element

It is well known that a large flux of electrons must pass through a specimen in order to obtain a high resolution image while a smaller particle flux is satisfactory for a low resolution image. The minimum particle flux that is required depends upon the contrast in the image and the signal-to-noise (S/N) ratio at which the data are considered acceptable. For a given S/N associated with statistical fluxtuations, the relationship between contrast and “counting statistics” is s131_eqn1, where C = contrast; r2 is the area of a picture element corresponding to the resolution, r; N is the number of electrons incident per unit area of the specimen; f is the fraction of electrons that contribute to formation of the image, relative to the total number of electrons incident upon the object.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Ultrastructural Correlations between Clonal Human Tumor Colonies and in Vivo Neoplasms

1982 ◽  
Vol 40 ◽  
pp. 210-211
Author(s):  
M.J. Murphy ◽  
R.R. Price ◽  
J.C. Sloman
Keyword(s):  
Cultured Cells ◽  
Human Tumor ◽  
Cell Type ◽  
Tumor Mass ◽  
Initial Cell ◽  
Cloning Assay ◽  
Human Tumor Cloning ◽  
The Relationship

The in vitro human tumor cloning assay originally described by Salmon and Hamburger has been applied recently to the investigation of differential anti-tumor drug sensitivities over a broad range of human neoplasms. A major problem in the acceptance of this technique has been the question of the relationship between the cultured cells and the original patient tumor, i.e., whether the colonies that develop derive from the neoplasm or from some other cell type within the initial cell population. A study of the ultrastructural morphology of the cultured cells vs. patient tumor has therefore been undertaken to resolve this question. Direct correlation was assured by division of a common tumor mass at surgical resection, one biopsy being fixed for TEM studies, the second being rapidly transported to the laboratory for culture.

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