bluuebunny/crossref_metadata_2025 huggingface dataset:
Grain Refinement of AZ61 Alloy after ECAP Processing
Authors: Hilšer Ondřej , Rusz Stanislav , Maziarz Wojciech , Chulist Robert , Dutkiewicz Jan , Čížek Lubomír , Kraus Martin , Tański Tomasz
Published: March 2017

Electron microscopy techniques were used to characterize the microstructure and deformation behavior of AZ61 alloy proceeded by ECAP. The commercial AZ61 alloy subjected to severe plastic deformation possesses a two-phase microstructure consisting of solid solution matrix and massive γ-phase Mg17Al12, or Mg17(Al,Zn)12 distributed mostly at grain boundaries. Based on selected area diffraction and electron back scattered diffraction applied to a sample after the third pass, it can be concluded that plastic deformation induced by ECAP occurs mainly by slip mode forming a high density network of dislocation inside the grains. The grains size was significantly refined to 1.4 μm after the third pass of ECAP. The refinement of grain size is probably due to polygonization process associated with formation of high angle grain boundaries due to dislocations rearrangement. (Al, Zn)12Mg17 precipitates of size scattered from 100 to 200 nm and also the primary precipitates of Al6Mn phase were observed in this alloy.
Microstructural and Mechanical Development of As-Cast and Heat-Treated 935AgCu Alloys
Authors: Sakultanchareonchai Siriwan , Chairuangsri Torranin , Imurai Suttawan , Nisaratanaporn Ekasit
Published: March 2017

Microstructural and mechanical development of the various heat-treated 935 Ag-Cu alloys were explored. The heat-treatment processes were applied viz. holding before quenching for 2 and 15 min, homogenization at 750 °C for 60 min followed by water quenching, and aging at 350 °C for 15 to 60 min followed by water quench. It was found that the specimens with copper addition gave a high resiliency in all heat treatment conditions however the effect of homogenization with aging treatment fostered deep blemish or fire scale on its surface. The amplifications of resiliency of 935 heat-treated AgCuSn and AgCuBe alloy were increased but elongation values were slightly reduced. The 935 AgCuBeSn specimens produced adequate resiliency and elongation after aging at 350 °C for 15 to 60 min followed by water quenching. Partial dissolution and spheroidization of eutectic phase were occurred by homogenization treatment at 750 °C. Aging treatment promoted precipitation of 3-20 nm fcc (Cu,Sn)–rich precipitates and engendered an improvement of hardness, yield strength and the modulus of resilience or resiliency.
Effects of Nickel and Chromium Additions on Microstructure of P/M 316L Stainless Steels
Authors: Asavavisithchai Seksak , Wangyao Panyawat , Tangmon Fonthip , Tangsatapornpad Pipat
Published: March 2017

The present study aims to investigate the effects of Ni and Cr additions on microstructure of P/M 316L stainless steels. The optimum content of both elements to maximize the oxidation resistance of the stainless steel with minimum σ phase formation and microstructural development in various sintering times are also examined. The 316L samples were produced by homogeneously mixing Ni and Cr powders in various contents, followed by cold compaction at high pressure for 30 s. The solutioning process was performed at 1300°C for 45 s under hydrogen atmosphere. The sintering temperature was at 800°C and the sintering times were selected at 200, 400 and 600 hrs, in order to simulate working conditions. The development of microstructure was examined through optical microscope. It is found that the addition of Ni and Cr resulted in the formation of different porosity contents. The porosity increases when the content of the powders increases.
Microstructure YBCO Bulk Superconductors Fabricated by Infiltration Growth Process
Authors: Vojtkova Liudmila , Diko Pavel
Published: March 2017

Single grain YBCO bulk superconductors were prepared from different starting precursors. In the first case, Y2Ba1Cu1O5 (Y211) powder as the solid phase and the liquid phase of mixture of YBa2Cu3O7-x+BaCuO2+CuO powders were used. In the second case the solid phase was prepared from the mixture of Y2O3+BaCuO2 instead of the conventionally used Y211. The microstructure of samples was studied by polarized light microscopy and scanning electron microscope (SEM). The influence of different staring compositions on the final size of Y211 particles is shown. Also the influence of BaCuO2 concentration in the Y2O3+x·BaCuO2 (x=0.2; 0.5; 0.8; 1; 1.2; 1.5; 1.8) mixture on the Y211 size was studied.
Al-Limestone and Al-Granite Composites Prepared by Cold Spraying
Authors: Kollarovičová Andrea , Beronská Naďa , Štefánik Pavol , Iždinský Karol
Published: March 2017

Two types of aluminium metal matrix composites (Al-MMCs) were prepared by cold spray process. The first Al-MMC was reinforced with granite rock and the second was reinforced with limestone rock particles. Al powder and rock powders (granite or limestone) were mixed to homogeneous mixtures and sprayed onto the Al substrate. The microstructure of as-sprayed composites was compared with microstructure of MMCs reinforced with commercially available Al2O3. The microstructures of Al-MMCs reinforced with granite and limestone were affected by hardness of rocks, particle sizes and compositions of the mixture. The coating is formed through high velocity impact of solid powders. The diameter of Al powder was about 30 μm and diameters of rock powders were from 5 to100 μm. Rock particles are distributed uniformly through the coating, maintaining their irregular morphologies. However, some large sized particles cracked and fragmented. The powder porosity was approximately 2.3 % for both types of Al-MMCs. Porous microstructure leads to lower critical velocity. The results indicate that, introducing irregular morphologies and/or pores into the feedstock. High quality metallic coatings can be more easily deposited by cold spray.
Estimation of Fibre Orientation in Injection Moulding Plastics Parts
Authors: Martinkovič Maroš , Likavčan Lukáš
Published: March 2017

Fibre orientation in short fibre reinforced thermoplastics depends on injection moulding parameters. There are a lot of different parameters that must be established and controlled to achieve proper injection moulding of a plastic part. These parameters fall within four major areas: pressure, temperature, time, and distance. The aim of this article is estimation of fibre orientation in injection moulding plastics parts and comparison of these results with numerical simulated ones. Stereological metallography was used for estimation of experimental orientation of fibres. The orientation of simple fibre may be defined by the two angles θ and Φ. In a Short Fibre Reinforced Thermoplastic (SFRT) component there are frequently millions of fibres, therefore each individual fibre orientation specifying is very impractical. The fibres orientation in space can be described by the probability distribution function (PDF), Ψ(θ, Φ). Numerical modelling of fibre orientation was realised using MOLDEX3D software. Moldex3D is the CAE product for the plastics injection moulding industry. This software allows to view results of fibre orientation as an orientation of the X direction, Y direction, Z direction, the total orientation and orientation at surface. These first three orientations are relevant for the establishment of second-order orientation tensor. They belong to tensor ́s values a11, a22 and a33. Utilization of stereological metallography for short fibre orientation in plastic matrix is very similar to its utilization for estimation of grain boundaries orientation in polycrystalline alloys cased by plastic deformation. In the case of short glass fibres reinforced thermoplastics it’s structure consist of thermoplastic matrix and reinforcing fibres, which has some preferred orientation in most of cases – the structure is anisotropy. The way of scalar measurement of structure anisotropy is determination of degree of orientation. The anisotropic microstructure is decomposed into isotropic, planar or linear oriented components using stereology methods.
Powder Processing and Thermal Spraying of Barium-Magnesium-Aluminium-Silicate Environmental Barrier Coatings
Authors: Čelko Ladislav , Jech David , Dvořák Karel , Ročňáková Ivana , Montúfar Edgar Benjamin , Slámečka Karel , Klakurková Lenka
Published: March 2017

As a potential candidate for the top coating in novel Environmental Barrier Coating systems, one representative of a Barium-Magnesium-Aluminium-Silicate family was produced in the form of the powder. Initial compounds were heat-treated to synthesize and the product was crushed in the ball mill device down to the fraction of 20 micrometers. In the next step, the atmospheric plasma spray (APS) technique was used to form a coating on a steel sheet substrate. The aim of this study was to obtain the most favorable technological parameters for the thermal spraying process and therefore two plasma spraying parameters for pure alumina or yttria stabilized zirconia, and other three experimentally designed ones were tested. Despite the same stand-off distance used for coatings manufacturing, thickness and porosity differed in order of tens of micrometers and several percent, respectively. Resulting coatings consisted of a mixture of amorphous and crystalline Al2O3, SiO2 and MgO phases.
Metallographic Investigations of a Late Medieval Pick Found at the Gold Mining Site "Goldzeche-Kleines Fleißtal", Austria
Authors: Strobl Susanne , Haubner Roland
Published: March 2017

The investigated mining tool, probable a pick, was made of iron and produced in the 15th / 16th century, consequently manufactured in a bloomery. It was used in a gold mine at the Fleißtal located in the Austrian Alps.A metallographic preparation and examination by LOM of the cross section reveals an elongated structure caused by forging. Regions with quite different carbon concentrations, various steel microstructures, slag stringers and oxide inclusions are observed. Extensive microhardness measurement all over the cross section of the pick was performed to get information about heat treatments. Various morphologies of cementite were observed e.g. fine needles, Fe3C at grain boundaries, bainitic and pearlitic Fe3C. But no martensite was found. There are some possibilities: e.g. the hardened surface was removed by corrosion or martensite was transformed (auto-tempered), i.e. cementite was precipitated during long time storage.
Application of Metallographic Methods for Thermal Ageing Evaluation on Samples from Primary Piping of NPP
Authors: Petzová Jana , Březina Martin , Balak Milos , Dománková Mária , Kupča Ľudovít
Published: March 2017

During a long-term operation of nuclear power plants (NPP), the changes of structural material properties occur. To ensure the safe and reliable operation, it is necessary to monitor and evaluate these changes mainly on components from primary circuit of NPPs. One of the dominant ageing mechanisms of NPP components besides the radiation embrittlement and the fatigue loads is the thermal ageing. The thermal ageing is the temperature, material and time dependent degradation mechanisms due to long-term exposure at the operating temperature of 570 K.This paper describes the project for thermal ageing monitoring at primary piping in NPP Bohunice Unit 3. There are summarized the results obtained from evaluation of original primary piping material.
Material Investigation of Bronze Artefacts from the Late Bronze Age
Authors: Msallamová Šárka , Šálková Kateřina , Fousová Michaela , Dvorský Drahomír , Jiřík Jaroslav , Šálková Tereza , Hiltscher Tomáš , Hlásek Daniel , John Jan , Pták Martin , Dohnal Jiří , Jáně Zdeněk
Published: March 2017

The study deals with the material survey of a raw material, bronze axe and sickle from the Late Bronze Age. Artefacts were chosen from a set of about thirty objects, which were found in a ceramic pot near to Křenovice in the South Bohemia. The ancient technology of the axe and the sickle production was determined by the evaluating of structural properties using prepared metallographic sections. The chemical composition of a metal matrix and intermediate phases were determined using a scanning electron microscope with an EDS analyzer and X-ray fluorescence. The corrosion products of the artefacts were analyzed by X-ray diffraction. The results showed that the axe was made from partly wrought bronze (CuSn10) processed by subsequent recrystallization annealing. The bronze sickle (CuSn11) was a cast without any further mechanical processing or heat treatment. The material of the a raw material was found to be an arsenical copper alloy (CuAs1), which was probably used as a starting material for the bronze alloy production.
An Ancient Bronze Ingot Smelted from Fahlore
Authors: Ertl Florian , Strobl Susanne , Haubner Roland
Published: March 2017

A bronze bun ingot fragment, produced in an ancient furnace, was investigated. The original surface was craggy and covered by a dark green “layer” of corrosion products and at the intersection shrink holes are visible. X-ray fluorescence analysis confirms Cu as balance, up to 4 wt.% As respectively 2.5 wt.% S and smaller amounts of Sb, Ni, Fe, Ag were measured. This composition suggests that fahlores were processed.
An inhomogeneous microstructure was observed over the cross section of the ingot caused by the alloying elements and their segregation during solidification of the melt.
The microstructure is dominated by copper dendrites and the interdendritic regions are enriched with the residual alloying elements which form precipitates. Near the ingot surface large oxide crystals were observed indicating oxide formation during the solidification of the melt. Another kind of fine-grained oxides were identified which are formed potentially by corrosion.
We can conclude that the ingot is arsenic bronze with quite a complex microstructure.
Effect of Grid Indentation Parameters on the Mechanical Characteristics of Steel Sheets by Depth Sensing Indentation
Authors: Burik Peter , Pešek Ladislav , Andrsova Zuzana , Kejzlar Pavel
Published: March 2017

Nanomechanical testing using depth sensing indentation (DSI) provides a straightforward solution for characterizing of mechanical properties (indentation hardness HIT, Young’s modulus EIT, indentation energy: total Wtotal, elastic Welast, plastic Wplast) of homogeneous (bulk) materials. However, real materials such as multi-phase steels are a heterogeneous material on the microscopic scale (microstructure). We need to know the local mechanical properties of each phase separately in those materials for reasons development of new materials and for modeling. Mechanical properties of each phase separately in multiphase materials are difficult or even impossible to examine in bulk material ex situ.In this paper we describe the technique for measuring the mechanical properties of each phase separately in multiphase steel by two-dimensional mapping tool. This approach relies on large arrays of nanoindentations (known as grid indentation) and statistical analysis of the resulting data [1, 2]. The aim of this investigation is to optimize the parameters of the grid indentation for a given microstructure of steel sheets.
Effect of Ge Thin Layer Position on Formation and Property of CZTSSe Thin Films and Solar Cells Prepared by Sputtering Method
Authors: Li Jin Ze , Shen Hong Lie , Li Yu Fang , Wang Wei
Published: March 2017

In this work we deposited a Ge thin layer under or upon Cu-Zn-Sn-S precursor by sputtering, followed by selenization process to obtain Ge doped CZTSSe thin films. A comparison of structural, morphology and optoelectrical property on Ge doped CZTSSe thin films with different Ge layer position was studied. It was found that even a little amount of Ge doping could affect the crystallization of CZTSSe grains. The solar cells based on two kinds of precursors both had VOC improvement compared with undoped CZTSSe solar cell. However, due to the inner stress in CZTSSe thin film, cracks appeared between the interface of buffer layer and window layer in CZTSSe solar cell with Ge bottom layer, leading to the decrease of conversion efficiency. With the help of Ge in reducing bulk recombination, CZTSSe solar cell based on Cu-Zn-Sn-S precursor with Ge top layer had a conversion efficiency of 5.38%, in contrast to 3.01% and 4.30% of CZTSSe solar cell with Ge bottom layer and undoped CZTSSe solar cell, respectively.
Microstructure Evolution and Macro Segregation of Directionally Solidified Hypoeutectic and Hypereutectic Lead-Tin Alloys
Authors: Sreenivas Rao K.V. , Akhil N.
Published: March 2017

Unidirectional solidification is preferred to multidirectional solidification for growing crystals in a particular direction. An experimental set-up consisting of Bridgman type of upward directional solidification was employed for the present investigation. The main aim of the present investigation was to assess the effect of unidirectional upward solidification on the segregation of off-eutectic Pb-Sn alloys at different translational speeds of the experimental set-up. Solidification experiments were conducted on hypoeutectic and hypereutectic Lead-Tin alloys. Different combinations of growth rate V and composition Co. were used to investigate their effect on longitudinal macro segregation. Macro segregation along the length of the samples was observed in hypoeutectic Pb-Sn alloys whereas no such macro segregation was observed in hypereutectic alloys. The intensity of longitudinal macro segregation was found to increase with the increase in initial tin content of the alloy, increase in distance from the chill end and decrease in the solidification rate.
Preliminary Study of the Effect Microwave-Heating on the Morphology and Surface Area of NaX Zeolite
Authors: Umam Hilman Imadul , Aimon Akfiny Hasdi , Iskandar Ferry
Published: March 2017

The effect of microwave-heating on the morphology and surface area of NaX zeolite was studied. The characteristics of NaX zeolite, which has a porous structure, make NaX zeolite applicable as a catalyst. Generally, the process of NaX zeolite formation with an FAU-type structure, either naturally or synthetically, requires quite a long time. Therefore, in this research the effect of microwave heating on the produced sample was investigated using XRD, SEM, and BET surface area measurement. The heating time parameter was varied to determine the optimal conditions for the synthesis of NaX zeolite. The results indicated that microwave-heating is capable of accelerating the crystallization process and reduce the agglomeration of NaX zeolite, as shown by the XRD and SEM results. Based on the SEM result, the particle size distributions of the samples microwave-heated for 1, 3, and 5 minutes, were 350.5, 262.5, and 243.9 nm respectively. In addition, prolonging the microwave-heating time made the surface area of the samples become larger. The specific surface area of the samples microwave-heated for 1, 3, and 5 minutes, 55.9, 153.5, and 204.1 m2/g respectively.
The Effect of Regeneration Conditions on the Properties of CeO2 Desulfurization Sorbent in SO2 Atmosphere
Authors: Yang Lei , Ju Shang Guan , Wang Hui Qing , An Jia , Yu Jun Ming , Mi Jie , Miao Mao Qian
Published: March 2017

CeO2 desulfurization sorbent was prepared by calcination of Ce(NO3)3 ● 6H2O and the effect of regeneration conditions on its properties in SO2 atmosphere was investigated in a fixed bed reactor. The regeneration conversion and the yield of elemental sulfur for CeO2 desulfurization sorbent were tested and calculated. And the composition and the morphology of CeO2 desulfurization sorbent before and after regeneration were obtained by X-ray diffraction and scanning electron microscope. It was found that the main components of the regeneration products of Ce2O desulfurization sorbent were solid CeO2 and gaseous elemental S in SO2 atmosphere. The optimum regeneration condition of CeO2 desulfurization sorbent is that the regeneration temperature of 750 °C and the SO2 concentration of 4.25 %, under which the CeO2 desulfurization sorbent shows the higher regeneration conversion of 96 % and the yield of elemental sulfur of 68.95 wt. %.
Gravity anomaly map, Canada
Authors: Jobin D M , Véronneau M , Miles W
Published: March 2017

The gravity anomaly map of Canada shows variations in the gravity field caused by lateral variations in the density of Earth's crust and upper mantle that reflect differences in composition and thickness. Systematic gravity mapping began in Canada in 1944 and is
ongoing. All Canadian gravity data are tied to the International Gravity Standardization Network 1971 (IGSN71) to create a coherent dataset at the global scale. Local gravity anomalies result from the juxtaposition of relatively high- and low-density rock types. Longer wavelength anomalies such as
the gravity low over the Cordillera and the relative gravity high over oceanic crust largely reflect variations in the thickness of the crust.
Chronological trends in maximum and minimum water flows of the Teesta River, Bangladesh, and its implications
Authors: Mondal Md. Sanaul H. , Islam Md. Serajul
Published: March 2017

Bangladesh shares a common border with India in the west, north and east and with Myanmar in the southeast. These borders cut across 57 rivers that discharge through Bangladesh into the Bay of Bengal in the south. The upstream courses of these rivers traverse India, China, Nepal and Bhutan. Transboundary flows are the important sources of water resources in Bangladesh. Among the 57 transboundary rivers, the Teesta is the fourth major river in Bangladesh after the Ganges, the Brahmaputra and the Meghna and Bangladesh occupies about 2071 km2 . The Teesta River floodplain in Bangladesh accounts for 14% of the total cropped area and 9.15 million people of the country. The objective of this study was to investigate trends in both maximum and minimum water flow at Kaunia and Dalia stations for the Teesta River and the coping strategies developed by the communities to adjust with uncertain flood situations. The flow characteristics of the Teesta were analysed by calculating monthly maximum and minimum water levels and discharges from 1985 to 2006. Discharge of the Teesta over the last 22 years has been decreasing. Extreme low-flow conditions were likely to occur more frequently after the implementation of the Gozoldoba Barrage by India. However, a very sharp decrease in peak flows was also observed albeit unexpected high discharge in 1988, 1989, 1991, 1997, 1999 and 2004 with some in between April and October. Onrush of water causes frequent flash floods, whereas decreasing flow leaves the areas dependent on the Teesta vulnerable to droughts. Both these extreme situations had a negative impact on the lives and livelihoods of people dependent on the Teesta. Over the years, people have developed several risk mitigation strategies to adjust with both natural and anthropogenic flood situations. This article proposed the concept of ‘MAXIN (maximum and minimum) flows’ for river water justice for riparian land.
A suicide risk screening scale for HIV-infected persons in the immediate post-diagnosis period
Authors: Govender R D , Schlebusch L
Published: March 2017

Background. The risk of suicidal tendencies in HIV-infected persons appears high and may parallel the increasing prevalence of suicidal behaviour in South Africa.Objective. To construct a brief suicide risk screening scale (SRSS) as a self-administered instrument to screen for suicidal ideation in recently diagnosed HIV-infected persons.Methods. An SRSS was developed, drawing 14 items from two established screening tests, and assessed using a sample of 150 HIV-infected consenting adults identified at a voluntary counselling and testing (VCT) clinic at an academic district level hospital in Durban, South Africa. Participants returned three weeks after their initial assessment for a re-assessment.Results. The internal consistency of the SRSS was good (Cronbach’s alpha, 0.87), and its sensitivity (81%) was higher than its specificity (47%). The findings suggest that, despite certain limitations, the SRSS may be a valuable screening tool for suicidal ideation at VCT clinics.Conclusion. Screening for suicide risk and possible suicidal behaviour in HIV-positive persons may form a routine aspect of comprehensive patient care at VCT clinics to assist with effective prevention and treatment.
Evaluation of Soft Tissue Landmark Reliability between Manual and Computerized Plotting Methods
Authors: Kasinathan Geetha , Kommi Pradeep B , Kumar Senthil M , Yashwant Aniruddh , Arani Nandakumar , Sabapathy Senkutvan
Published: March 2017

Aim

The aim of the study is to evaluate the reliability of soft tissue landmark identification between manual and digital plottings in both X and Y axes.

Materials and methods

A total of 50 pretreatment lateral cephalograms were selected from patients who reported for orthodontic treatment. The digital images of each cephalogram were imported directly into Dolphin software for onscreen digitalization, while for manual tracing, images were printed using a compatible X-ray printer. After the images were standardized, and 10 commonly used soft tissue landmarks were plotted on each cephalogram by six different professional observers, the values obtained were plotted in X and Y axes. Intraclass correlation coefficient was used to determine the intrarater reliability for repeated landmark plotting obtained by both the methods.

Results

The evaluation for reliability of soft tissue landmark plottings in both manual and digital methods after subjecting it to interclass correlation showed a good reliability, which was nearing complete homogeneity in both X and Y axes, except for Y axis of throat point in manual plotting, which showed moderate reliability as a cephalometric variable. Intraclass correlation of soft tissue nasion had a moderate reliability along X axis. Soft tissue pogonion shows moderate reliability in Y axis. Throat point exhibited moderate reliability in X axis.

Conclusion

The interclass correlation in X and Y axes shows high reliability in both hard tissue and soft tissue except for throat point in Y axis, when plotted manually.

The intraclass correlation is more consistent and highly reliable for soft tissue landmarks and the hard tissue landmark identification is also consistent.

Clinical significance

The results obtained for manual and digital methods were almost similar, but the digital landmark plotting has an added advantage in archiving, retrieval, transmission, and can be enhanced during plotting of lateral cephalograms. Hence, the digital method of landmark plotting could be preferred for both daily use and research because of the advantages.

How to cite this article

Kasinathan G, Kommi PB, Kumar SM, Yashwant A, Arani N, Sabapathy S. Evaluation of Soft Tissue Landmark Reliability between Manual and Computerized Plotting Methods. J Contemp Dent Pract 2017;18(4):317-321.
Correlation of Orthodontic Treatment by Fixed or Myofunctional Appliances and Periodontitis: A Retrospective Study
Authors: Mangat Sukhpreet , Kichorchandra Modi S , Handa Akash , Bindhumadhav Suresh
Published: March 2017

Introduction

Malocclusion plays an important role in the development of periodontitis. Thus, by treating malocclusion, a good gingival health can be achieved. This study was conducted to establish the correlation between orthodontic tooth movement and periodontitis.

Materials and methods

This is a retrospective study conducted on 220 patients who underwent orthodontic treatment for malocclusion. They were divided into two groups: Group I patients were treated with fixed orthodontics, while group II patients received myofunctional appliances.

Results

The value for plaque, gingival recession, and tooth mobility significantly increased in group I patients. However, the difference was statistically nonsignificant in group II patients.

Conclusion

The authors concluded that there is correlation between malocclusion and periodontitis. Malocclusion leads to periodontitis.

Clinical significance

Malocclusion is the main reason for the development of poor periodontal health. Combined effort has to be played by both periodontist and orthodontist for the treatment of various orthodontic-periodontal problems.

How to cite this article

Sharma K, Mangat S, Kichorchandra MS, Handa A, Bindhumadhav S, Meena M. Correlation of Orthodontic Treatment by Fixed or Myofunctional Appliances and Periodontitis: A Retrospective Study. J Contemp Dent Pract 2017;18(4):322-325.
Twelve Impacted Supernumerary Teeth in a Nonsyndromic Patient: A Rare Case Report
Authors: Ali Fareedi Mukram
Published: March 2017

Teeth in excess number than the normal count are called supernumerary teeth. They can be either unilateral or bilateral and single or multiple, found at any place in the dental arch, but most commonly found in the anterior maxillary region. Supernumerary teeth are commonly associated with syndromes when present in more numbers, but can be idiopathic. The present study shows a case report of a 16-year-old female patient who reported with overretained deciduous teeth. A panoramic radiograph showed multiple impacted supernumerary teeth. Based on clinical features and radiographic examination, a diagnosis of idiopathic hyperdontia was given. In such types of patients, management must be planned by a multidisciplinary approach.

How to cite the article

Al-Iryani GM, Ali FM. Twelve Impacted Supernumerary Teeth in a Nonsyndromic Patient: A Rare Case Report. J Contemp Dent Pract 2017;18(4):342-344.
Miles Davis' Bitches Brew
Authors: Grella   Jr. George
Published: March 2017

It was 1969, and Miles Davis, prince of cool, was on the edge of being left behind by a dynamic generation of young musicians, an important handful of whom had been in his band. Rock music was flying off in every direction, just as America itself seemed about to split at its seams. Following the circumscribed grooves and ambiance of In A Silent Way; coming off a tour with a burning new quintet—called ‘The Lost Band’—with Wayne Shorter, Chick Corea, Dave Holland and Jack DeJohnette; he went into the studio with musicians like frighteningly talented guitarist John McLaughlin, and soulful Austrian keyboardist Joe Zawinul. Working with his essential producer, Teo Macero, Miles set a cauldron of ideas loose while the tapes rolled. At the end, there was the newly minted Prince of Darkness, a completely new way forward for jazz and rock, and the endless brilliance and depth of Bitches Brew.

Bitches Brew is still one of the most astonishing albums ever made in either jazz or rock. Seeming to fuse the two, it actually does something entirely more revolutionary and open-ended: blending the most avant-garde aspects of Western music with deep grooves, the album rejects both jazz and rock for an entirely different idea of how music can be made.
Geto Boys' The Geto Boys
Authors: Potts Rolf
Published: March 2017

At the outset of summer in 1990, a Houston gangsta rap group called the Geto Boys was poised to debut its self-titled third album under the guidance of hip-hop guru Rick Rubin. What might have been a low-profile remix release from a little-known corner of the rap universe began to make headlines when the album’s distributor refused to work with the group, citing its violent and depraved lyrics. When The Geto Boys was finally released, chain stores refused to stock it, concert promoters canceled the group’s performances, and veteran rock critic Robert Christgau declared the group ‘sick motherfuckers.’

One quarter of a century later the album is considered a hardcore classic, having left an immutable influence on gangsta rap, horrorcore, and the rise of Southern hip-hop.

Charting the rise of the Geto Boys from the earliest days of Houston’s rap scene, Rolf Potts documents a moment in music history when hip-hop was beginning to replace rock as the transgressive sound of American youth. In creating an album that was both sonically innovative and unprecedentedly vulgar, the Geto Boys were accomplishing something that went beyond music. To paraphrase a sentiment from Don DeLillo, this group of young men from Houston’s Fifth Ward ghetto had figured out the ‘language of being noticed’ — which is, in the end, the only language America understands.
Donny Hathaway's Donny Hathaway Live
Authors: Lordi Emily J.
Published: March 2017

In January of 1979, the great soul artist Donny Hathaway fell fifteen stories from a window of Manhattan’s Essex House Hotel in an alleged suicide. He was 33 years old and everyone he worked with called him a genius. Best known for “A Song for You,” “This Christmas,” and classic duets with Roberta Flack, Hathaway was a composer, pianist, and singer committed to exploring “music in its totality.” His velvet melisma and vibrant sincerity set him apart from other soul men of his era while influencing generations of singers and fans whose love affair with him continues to this day.

The first nonfiction book about Hathaway, Donny Hathaway Live uses original interviews, archival material, musical analysis, cultural history, and poetry to tell the story of Hathaway’s life, from his beginnings as a gospel wonder child to his final years. But its focus is the brutally honest, daringly gorgeous music he created as he raced the clock of mental illness—especially in the performances captured on his 1972 album Donny Hathaway Live. That album testifies to Hathaway’s uncanny ability to amplify the power and beauty of his songs in the moment of live performance. By exploring that album, we see how he generated a spiritual experience for those present at his shows, and for those with the privilege to listen in now.
Dead Kennedys' Fresh Fruit for Rotting Vegetables
Authors: Foley Michael Stewart
Published: March 2017

In 1978, San Francisco, a city that has seen more than its share of trauma, plunged from a summer of political tension into an autumn cascade of malevolence that so eluded human comprehension it seemed almost demonic. The battles over property taxes and a ballot initiative calling for a ban on homosexuals teaching in public schools gave way to the madness of the Jonestown massacre and the murders of Mayor George Moscone and city supervisor Harvey Milk at the hands of their former colleague, Dan White.

In the year that followed this season of insanity, it made sense that a band called Dead Kennedys played Mabuhay Gardens in North Beach, referring to Governor Jerry Brown as a “zen fascist,” calling for landlords to be lynched and yuppie gentrifiers to be sent to Cambodia to work for “a bowl of rice a day,” critiquing government welfare and defense policies, and, at a time when each week seemed to bring news of a new serial killer or child abduction, commenting on dead and dying children. But it made sense only (or primarily) to those who were there, to those who experienced the heyday of “the Mab.

Most histories of the 1970s and 1980s ignore youth politics and subcultures. Drawing on Bay Area zines as well as new interviews with the band and many key figures from the early San Francisco punk scene, Michael Stewart Foley corrects that failing by treating Dead Kennedys’ first record, Fresh Fruit for Rotting Vegetables, as a critical historical document, one that not only qualified as political expression but, whether experienced on vinyl or from the stage of “the Mab,” stimulated emotions and ideals that were, if you can believe it, utopian.
Song of the North Country
Authors: Pichaske David
Published: March 2017

A remarkably fresh piece of Dylan scholarship, focusing on the profound impact that his Midwestern roots have had on his songs, politics, and prophetic character.
Global 7 km mesh nonhydrostatic Model Intercomparison Project for improving TYphoon forecast (TYMIP-G7): experimental design and preliminary results
Authors: Nakano Masuo , Wada Akiyoshi , Sawada Masahiro , Yoshimura Hiromasa , Onishi Ryo , Kawahara Shintaro , Sasaki Wataru , Nasuno Tomoe , Yamaguchi Munehiko , Iriguchi Takeshi , Sugi Masato , Takeuchi Yoshiaki
Published: March 2017

Abstract. Recent advances in high-performance computers facilitate operational numerical weather prediction by global hydrostatic atmospheric models with horizontal resolutions of  ∼  10 km. Given further advances in such computers and the fact that the hydrostatic balance approximation becomes invalid for spatial scales  <  10 km, the development of global nonhydrostatic models with high accuracy is urgently required. The Global 7 km mesh nonhydrostatic Model Intercomparison Project for improving TYphoon forecast (TYMIP-G7) is designed to understand and statistically quantify the advantages of high-resolution nonhydrostatic global atmospheric models to improve tropical cyclone (TC) prediction. A total of 137 sets of 5-day simulations using three next-generation nonhydrostatic global models with horizontal resolutions of 7 km and a conventional hydrostatic global model with a horizontal resolution of 20 km were run on the Earth Simulator. The three 7 km mesh nonhydrostatic models are the nonhydrostatic global spectral atmospheric Double Fourier Series Model (DFSM), the Multi-Scale Simulator for the Geoenvironment (MSSG) and the Nonhydrostatic ICosahedral Atmospheric Model (NICAM). The 20 km mesh hydrostatic model is the operational Global Spectral Model (GSM) of the Japan Meteorological Agency. Compared with the 20 km mesh GSM, the 7 km mesh models reduce systematic errors in the TC track, intensity and wind radii predictions. The benefits of the multi-model ensemble method were confirmed for the 7 km mesh nonhydrostatic global models. While the three 7 km mesh models reproduce the typical axisymmetric mean inner-core structure, including the primary and secondary circulations, the simulated TC structures and their intensities in each case are very different for each model. In addition, the simulated track is not consistently better than that of the 20 km mesh GSM. These results suggest that the development of more sophisticated initialization techniques and model physics is needed to further improve the TC prediction.
Significado y sentidos de la construcción 'X hizo/ se marcó un Nombre propio'
Authors: Portolés Lázaro José
Published: March 2017

En los últimos años se ha difundido en el español coloquial la construcción X hizo/ se marcó un Nombre propio (v.gr. Edurne hizo/ se marcó un Angelina Jolie). Su sujeto tiene el papel temático de agente, únicamente aparece con los verbos hacer(se) y marcarse, y su objeto directo es un sintagma determinante introducido por un y seguido de un nombre propio que se interpreta como un evento dinámico y delimitado. El concepto ad hoc que se comprende de este nombre propio depende del contexto de los participantes de la interacción, estos deben encontrar un evento que se corresponda con un acto típico del individuo que se menciona. En la adquisición de esta construcción han coadyuvado el calco de una construcción semejante del inglés y la existencia previa de usos del verbo hacer con sustantivos como objetos directos cuyo origen es un nombre propio (v.gr. El saltador hizo un fósbury).
Ultrachopper Assisted Prechopping for Small-incision Cataract Surgery
Authors: Berrospi Rubén D. , Tello Alejandro , Galvis Virgilio
Published: March 2017

Purpose

To describe a new technique to split rock-hard nuclei using an ultrasonic chopper (Ultrachopper) and a prechopper, in order to perform a modified small incision manual cataract extraction.

Methods

The Ultrachopper device, which is compatible with modern phacoemulsification systems, is used to facilitate the division of very hard nuclei in a straightforward manner using a manual prechopper, and the two fragments are extracted using Kansas forceps.

Results

In rock-hard nuclei, this technique is very effective to divide and extract the fragments. The risk of complications related to phacoemulsification on these very challenging cases is avoided.

Conclusions

This modified small incision manual cataract extraction technique, assisted with an ultrasonic chopper (Ultrachopper) and a prechopper, is a very good alternative in rock-hard nuclei.
Optic Nerve Incidentaloma
Authors: Grosso Andrea , Sigler Eric J. , Randolph John
Published: March 2017

Retinal astrocytic hamartomas are rare, benign tumors of glial origin. These lesions are often associated with systemic syndromes, including tuberous sclerosis complex and neurofibromatosis type 1, but also may be encountered in otherwise healthy individuals as an acquired lesion. We present the following case to illustrate clinical and imaging characteristics typically seen in astrocytic hamartoma found as “optic nerve incidentaloma” in an otherwise healthy teenager.
Deep Anterior Lamellar Keratoplasty and Phototherapeutic Keratectomy for Management of Thiel-Behnke Corneal Dystrophy
Authors: Monaco Gaspare , Scialdone Antonio , Gari Mariangela , Messina Marco , Wilde Craig , Dua Harminder S.
Published: March 2017

Background

To evaluate the outcome of surgical options in the management of Thiel-Behnke corneal dystrophy (TBCD). This is a retrospective case report.

Methods

A 52-year-old female with TBCD with a visual acuity of 0.50 LogMAR in both eyes underwent deep anterior lamellar keratoplasty (DALK) in her left eye (LE) and, 8 months later, phototherapeutic keratectomy (PTK) in her right eye (RE). Postoperatively, the presence of recurrence, uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), central corneal thickness (CCT), and spherical equivalent (SE) were assessed. Spectralis domain anterior segment optical coherence tomography was also performed to evaluate corneal morphology and reflectivity.

Results

At 1 year, the LogMAR UCVA and BCVA were +0.80 and +0.24, respectively, in the LE and +0.70 and +0.24 in the RE, respectively. CCT and SE were 741 microns (μm) and +4.25 diopters (D) in the LE, respectively, and 339 μm and +6.00 D in the RE, respectively. The cornea was clear in the LE. There was early recurrence of the TBCD and corneal haze in the RE.

Conclusions

The visual outcome of both DALK and PTK were similar for TBCD. No episodes of rejection or recurrence of dystrophy were noted in the eye that underwent DALK. However, postoperative hyperopic shift, persistent haze, and early recurrence were noted after PTK.
The Efficacy of Arabic Version of the Developmental Assessment of Young Children Second Edition (DAYC-2) Scale in Detecting Developmental Delay among Jordanian Children Aged Birth to 71 Months
Authors: Abu Saleh Rawan M. , Smadi Jamil M.
Published: March 2017

This study aimed to assess the efficacy of the developmental assessment of young children second edition (DAYC-2) Scale in detecting Developmental Delay among Jordanian children aged birth to 71 months. Firstly, the scale was translated and reviewed for language and cultural appropriateness. Secondly, the Arabic Jordanian version of the scale was administrated to children diagnosed as developmental delay aged from birth to 48 months in the neurodevelopmental pediatric clinic in Jordan university hospital, and on children aged 48 to 71 months who were diagnosed as developmental delay in special education centers in Capital Amman. The scale was administrated also to normal development children aged 0 to71months who visited the Institute for family health–Noor al Hussein foundation and attended preschools in Capital Amman. Total of 310 children aged (0-71months) were enrolled. Construct validity and discriminative validity were verified. Reliability was established through computing Kuder–Richardson Formula 20 (KR-20), test-retest, split half test methods.t-test showed that the scale discriminates between normally developed and developmentally delayed children. One-way ANOVA showed that age has significant effect on the performance of children favoring older age groups using Scheffé multiple comparisons test.Item efficacy was determined by calculating point-biserial correlation coefficients for all items in each domain. The results showed that the scale had good psychometric properties and was capable of detecting developmental delay in children aged from birth to 71 months in Jordan.
The Role of Continuous Education Programs Organized by Saudi Universities in Literacy—A Case Study of King Saud University
Authors: Al Rawaf Haya Saad Abdulla , Abdel Fattah Azza Khalil , Abdel Megeid Fadia Yousif , Nazmy Rania Mohammed Aziz , Alarifi Sarah Nasser , Al Sulaihm Hind Sulaiman
Published: March 2017

This study aims at highlighting the role of Continuous Education Programs at the Saudi Universities in Religious, Social, and Health Literacy; King Saud University was taken as an example. To achieve the goals of the study two questionnaires were distributed among two samples from King Saud University; (101) of students, and (9) of continuous education centers’ directors. Results showed that continuous education programs presented in religious awareness development do not contribute sufficiently in developing them. However; continuous education programs have favorable role in community’s social culturing. Also, continuous education programs contribute, at medium degree, in community’s health culturing. On the other hand; people in charge agree that the investment revenue in financing continuous education programs is minor as well as financing offered by the University. In light of the study results, the researchers recommended paying more attention to present more continuous education programs of concern as to individuals’ needs through cooperation with the research center in the University to perform survey studies targeted to define the individuals’ needs in terms of religious, social and health issues.
Utilizing Social Media to Encourage Domestic Tourism in Oman
Authors: Al-Badi Ali , Tarhini Ali , Al-Sawaei Salima
Published: March 2017

Nowadays people use social media in order to create, share or exchange information, pictures or videos in virtual communities and networks. Furthermore, followers can ‘like’, ‘share’ and ‘comment’ on other people’s content or posts. Obviously, social media sites have an influence on the decision-making process, especially in the tourism sector, which has economic benefits for the country; people utilize social media channels in tourism promotional activities in order to encourage and promote domestic tourism. Hence, this Study aims to investigate how to use social media technology in order to encourage and improve domestic tourism in Oman. Data were collected using a self-administrated questionnaire from individuals who are currently using social media sites and have an interest in domestic tourism in Oman. There are three main findings: 1) there are a large number of people who use social media technology to obtain information about different attractive places they wish to visit in Oman, 2) the majority of the respondents claim that negative experiences posted on social media about a particular destination influence their travel decisions, and 3) many of the respondents indicate that the Ministry of Tourism in Oman should utilize more social media tools such as Instagram, Twitter, etc. in order to encourage domestic tourism. This research has implications not only to the Ministry of Tourism to promote domestic tourism in Oman, but also to Omani people and tourists from other countries who visit or like to visit Oman.