MICROABRASÃO DO ESMALTE

Enamel defects are described as changes in its structure characterized by local decrease or loss of its translucency from fluorosis, hypocalcifications, hypoplasias and inactive carious lesions with superficial and medium depth. The microabrasion of enamel selectively promotes the removal of its surface layer that presents color or structure modification through a mixture of abrasive and erosive agents mechanically. The association of these agents exposes a sub-layer of enamel with normal characteristics. This procedure can be used alone or associated with one or more aesthetic treatments, such as tooth whitening and composite resin restorations. Objective: to approach the microabrasion technique applied in dental enamel with changes in color and structure. Methodology: a non-systematic review of the scientific literature, published from 2009 to 2019, was carried out in the Virtual Health Library and in the academic Google. The inclusion criteria were articles in Portuguese and English, published in the last 10 years, that addressed the proposed theme. Conclusion: Dental microabrasion is a good alternative for aesthetic treatment for changes in the superficial structure of dental enamel, fluorosis and hypoplasia, because it wears little dental structure, restores aesthetics, does not cause damage to the pulp or periodontal tissues, requires little treatment time, does not require cavitary preparation, nor restorative material and is low cost. Aesthetic dissatisfaction is a concern of patients of all ages and the diagnosis of dental fluorosis should be the result of careful anamnesis and it should be taken into account that the etiology may be of various origins.

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Esthetic Rehabilitation with Direct Composite Resin in a Patient with Amelogenesis Imperfecta: A 2-Year Follow-Up

Case Reports in Dentistry ◽

10.1155/2019/8407025 ◽

2019 ◽

Vol 2019 ◽

pp. 1-4

Author(s):

Nathaly Stephania Palacios Rizzo ◽

Leonardo Fernandes da Cunha ◽

Bruno Vinueza Sotelo ◽

Carla Castiglia Gonzaga ◽

Gisele Maria Correr ◽

...

Keyword(s):

Composite Resin ◽

Dental Treatment ◽

Low Cost ◽

Dental Enamel ◽

Amelogenesis Imperfecta ◽

Tooth Color ◽

Restorative Treatment ◽

Composite Resin Restorations ◽

The One

Amelogenesis imperfecta is a group of conditions caused by over 15 different genes that affects the development of dental enamel and poses some challenges to dentists. An adult patient with amelogenesis imperfecta with severe changes in tooth color and reduction of occlusal vertical dimension sought dental treatment. Diagnostic wax-up was carried out to guide the stratification of a nanoparticulate resin for the restorative treatment. Direct composite resin restorations were applied on all teeth for modification of both esthetics and occlusion. After a 2-year follow-up, the findings appear to suggest that composite resin is a low-cost alternative when compared with indirect ceramic restorations, provides a good esthetic outcome, and offers considerable longevity for cases like the one reported herein.

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Vital Tooth Whitening Techniques. A literature Review

Current Dentistry ◽

10.2174/2542579x02999200812130854 ◽

2020 ◽

Vol 02 ◽

Author(s):

Pia Chatterjee Kirk

Keyword(s):

Soft Tissues ◽

Treatment Time ◽

Tooth Bleaching ◽

Tooth Whitening ◽

Easy Method ◽

Tooth Structure ◽

Dental Esthetics ◽

Total Treatment Time ◽

Restorative Materials ◽

Total Treatment

Background: Vital tooth whitening has become an integral part of esthetic dentistry and remains one of the safest and most economic options today to improve dental esthetics without removing tooth structure. The tooth whitening materials have evolved into three categories: dentist-prescribed/dispensed (in office and patient home-use), and over-thecounter purchased and applied by patients. Objective: This review outlines the latest advances in dentist prescribed vital teeth whitening techniques, effects on tooth structure, soft tissues, and dental restoratives. Areas requiring additional research are also discussed. Methods: Electronic and manual literature search was conducted for key words such as tooth bleaching, and dental bleaching techniques using PubMed/MEDLINE, followed by manual selection of the studies that included whitening procedures in vital teeth. Results: The two main whitening agents are carbamide peroxide (CP) and hydrogen peroxide (HP or H2O2) whose concentration, duration of contact, and total treatment time can alter results. In addition, factors including the type of stain, and age of patient can affect results. Although whitening agents can affect tooth structure, restorative materials, and gingival tissues, the changes are temporary or can be treated using minimally invasive techniques. Conclusion: Areas requiring further research include the actual mechanism of whitening, its effect on tooth structure and restorative materials, and the development of an easy method to quantitate the degree of whitening in the dental office.

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Influence of Intermittent Parathyroid Hormone (PTH) Administration on the Outcomes of Orthodontic Tooth Movement—A Systematic Review

Applied Sciences ◽

10.3390/app11115268 ◽

2021 ◽

Vol 11 (11) ◽

pp. 5268

Author(s):

Zohaib Khurshid ◽

Faris Yahya Asiri

Keyword(s):

Parathyroid Hormone ◽

Animal Studies ◽

Tooth Movement ◽

Orthodontic Tooth Movement ◽

Inclusion Criteria ◽

Medical Subject Headings ◽

Periodontal Tissues ◽

Minimal Bias ◽

Intermittent Pth

Objective: The aim of this review is to summarize the effects of local and systemic PTH administration on periodontal tissues during orthodontic tooth movement. Materials and methods: An electronic search was conducted on the following databases: PubMed/MEDLINE, Google Scholar, SCOPUS and Embase. On PubMed/MEDLINE, the Medical Subject Headings (MeSH) keywords used were: “orthodontic tooth movement” OR (“tooth” (All Fields) AND “tooth movement” (All Fields)) OR “tooth movement” (All Fields)) AND (“parathyroid hormone”); all studies included using CONSORT. Results: After elimination of duplicates and articles not meeting our inclusion criteria, seven animal studies were included in this review. Although the majority of the studies suggest that PTH may a have a favorable outcome on OTM, most studies were found to have several sources of bias. Conclusion: Animal studies with minimal bias and long-term clinical studies are needed to ascertain the efficacy of intermittent PTH administration in improving the rate and retention of OTM.

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A Portable Device for Methane Measurement Using a Low-Cost Semiconductor Sensor: Development, Calibration and Environmental Applications

Sensors ◽

10.3390/s21227456 ◽

2021 ◽

Vol 21 (22) ◽

pp. 7456

Author(s):

Leonardo Furst ◽

Manuel Feliciano ◽

Laercio Frare ◽

Getúlio Igrejas

Keyword(s):

Tin Dioxide ◽

Anthropogenic Activities ◽

Low Cost ◽

Ventilation System ◽

Treatment Plant ◽

Good Alternative ◽

Oxide Semiconductor ◽

Spatial And Temporal Patterns ◽

Cost System ◽

Methane Concentrations

Methane is a major greenhouse gas and a precursor of tropospheric ozone, and most of its sources are linked to anthropogenic activities. The sources of methane are well known and its monitoring generally involves the use of expensive gas analyzers with high operating costs. Many studies have investigated the use of low-cost gas sensors as an alternative for measuring methane concentrations; however, it is still an area that needs further development to ensure reliable measurements. In this work a low-cost platform for measuring methane within a low concentration range was developed and used in two distinct environments to continuously assess and improve its performance. The methane sensor was the Figaro TGS2600, a metal oxide semiconductor (MOS) based on tin dioxide (SnO2). In a first stage, the monitoring platform was applied in a small ruminant barn after undergoing a multi-point calibration. In a second stage, the system was used in a wastewater treatment plant together with a multi-gas analyzer (Gasera One Pulse). The calibration of low-cost sensor was based on the relation of the readings of the two devices. Temperature and relative humidity were also measured to perform corrections to minimize the effects of these variables on the sensor signal and an active ventilation system was used to improve the performance of the sensor. The system proved to be able to measure low methane concentrations following reliable spatial and temporal patterns in both places. A very similar behavior between both measuring systems was also well noticeable at WWTP. In general, the low-cost system presented good performance under several environmental conditions, showing itself to be a good alternative, at least as a screening monitoring system.

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Bacterial Cell Inactivation Using a Single-Frequency Batch-Type Ultrasound Device

Indonesian Journal of Science and Technology ◽

10.17509/ijost.v6i1.31516 ◽

2021 ◽

Vol 6 (1) ◽

pp. 65-80

Author(s):

Poetro Sambegoro ◽

Maya Fitriyanti ◽

Bentang Arief Budiman ◽

Kamarisima Kamarisima ◽

Sekar Wangi Arraudah Baliwangi ◽

...

Keyword(s):

Bacterial Cell ◽

Treatment Time ◽

Low Cost ◽

Single Frequency ◽

Bacterial Cells ◽

Cell Inactivation ◽

E Coli ◽

Commercial System ◽

Ultrasound Device ◽

Frequency Ultrasound

Ultrasound technology employs cavitation to generate high-pressure soundwaves to disrupt bacterial cells. This study reveals the effectiveness of a single frequency ultrasound device for bacterial cell inactivation. A low-cost ultrasound device having a single frequency, i.e. 22 kHz for lab-scale application, was developed first, and the prototype was mechanically designed and analyzed using the finite-element method to assure the targeted natural frequency could be achieved. The prototype was then tested inactivating bacterial cells, Escherichia coli (E. coli) and Bacillus subtilis (B. subtilis), in a simple medium and a food system, and the results were then compared to a commercial system. A treatment time of up to 15 minutes was able to reduce E. coli and B. subtilis cells by 3.3 log and 2.8 log, respectively, and these results were similar to those of the commercial system. The effectiveness of bacterial cell inactivation using the developed single-frequency ultrasound device is then discussed. The findings are useful for designing low-cost ultrasound devices for application in the food industry.

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Cereal bar with cassava bagasse: chemical composition and sensory acceptance

Brazilian Journal of Food Research ◽

10.3895/rebrapa.v7n2.3520 ◽

2016 ◽

Vol 7 (2) ◽

pp. 42

Author(s):

Aparecida De Fátima Oliveira Silva ◽

Leila Maria Girondi ◽

Suellen Jensen Klososki ◽

Tatiana Colombo Pimentel ◽

Carlos Eduardo Barão

Keyword(s):

Chemical Composition ◽

Low Cost ◽

Good Alternative ◽

Production Costs ◽

Raw Material ◽

Brazil Nuts ◽

Sensory Acceptance ◽

Cassava Bagasse ◽

Hedonic Scale ◽

Cereal Bars

Cassava bagasse, regarded as an agricultural residue can be used as raw material in the development of new products. Cereal bars are foods that have increasingly gained consumers because of the practical use. The objective of this study was to evaluate the effect of adding cassava bagasse (0, 8 and 25%) on the chemical composition and sensory acceptance of coconut cereal bars with Brazil nuts. Cereal bars with cassava bagasse had higher moisture, protein and carbohydrates (fiber) contents than cereal bars without bagasse, lower ash contents and similar fat content. The addition of cassava bagasse caused a decrease in the acceptance of the cereal bars only in the concentration of 25%, however, the products had hedonic values greater than 7 in a 9-point hedonic scale and acceptability indices higher than 80%, indicating that consumers moderately liked them. It can be concluded that the use of up to 25% cassava bagasse in the cereal bar formulation yields products with improved nutritional value and appropriated consumer acceptance. The addition of cassava bagasse to food products is a good alternative in the use of this byproduct, due to the sensory characteristics of the obtained products and the reduction of production costs, because the cassava bagasse has low cost and increases the production yield.

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Polarization Microscopy of Dental Enamel with Reference to Incipient Carious Lesions

Advances in Oral Biology ◽

10.1016/b978-1-4832-3117-4.50015-2 ◽

1964 ◽

pp. 255-296 ◽

Cited By ~ 19

Author(s):

DIEGO CARLSTRÖM

Keyword(s):

Dental Enamel ◽

Polarization Microscopy ◽

Carious Lesions

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Ultrasound Intensity and Treatment Time Fuzzy Logic Control System for Low Cost Effective Ultrasound Therapy Devices

Advances in Soft Computing - Computational Intelligence, Theory and Applications ◽

10.1007/3-540-31182-3_75 ◽

2006 ◽

pp. 797-807 ◽

Cited By ~ 3

Author(s):

A. Yardimci ◽

O. Celik

Keyword(s):

Fuzzy Logic ◽

Control System ◽

Fuzzy Logic Control ◽

Treatment Time ◽

Low Cost ◽

Cost Effective ◽

Ultrasound Therapy ◽

Logic Control ◽

Ultrasound Intensity

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Micro-osteoperforations and Its Effect on the Rate of Tooth Movement: A Systematic Review

European Journal of Dentistry ◽

10.1055/s-0040-1713955 ◽

2020 ◽

Author(s):

Khalifa S. Al-Khalifa ◽

Hosam A. Baeshen

Keyword(s):

Minimally Invasive ◽

Cortical Bone ◽

Web Of Science ◽

Tooth Movement ◽

Treatment Time ◽

Orthodontic Tooth Movement ◽

Inclusion Criteria ◽

Electronic Search ◽

Invasive Method ◽

Regional Acceleratory Phenomenon

AbstractProlonged orthodontic treatments have inconvenienced patients and clinicians alike. Surgically assisted techniques for accelerating orthodontic tooth movement have shown promising results in the literature over the years. The minimally invasive nature of micro-osteoperforations (MOPs), however, for enhanced orthodontic tooth movement has recently gained momentum, with many clinical trials conducted on both animals and humans. An electronic search was performed to extract papers using PubMed, Google Scholar, Scopus, and Web of Science. The keywords that were used included “MOP,” “accelerating tooth movement,” “orthodontic tooth movement,” and “regional acceleratory phenomenon.” The studies that met our inclusion criteria were extracted and evaluated in this review. MOPs have been proven time and again, in animal and human studies alike, to increase the rate of orthodontic tooth movement. The application of perforations to cortical bone present in the pathway of teeth, which are specifically to be moved creates transient osteopenia. This reduces the density of the cortical bone, hence speeding up the rate of orthodontic tooth movement. Many techniques have been implemented and perfected to enhance orthodontic tooth movement and shorten the treatment time in the literature. MOPs have proven to be a universally applied, nontechnical, repeatable, and minimally invasive method of accelerating tooth movement, with extremely minimal consequences.

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