Browse publications by year: 2020

  1. Sharif A, Aloui C, Yarovaya L
    Int Rev Financ Anal, 2020 Jul;70:101496.
    PMID: 38620230 DOI: 10.1016/j.irfa.2020.101496
    In this paper, we analyze the connectedness between the recent spread of COVID-19, oil price volatility shock, the stock market, geopolitical risk and economic policy uncertainty in the US within a time-frequency framework. The coherence wavelet method and the wavelet-based Granger causality tests applied to US recent daily data unveil the unprecedented impact of COVID-19 and oil price shocks on the geopolitical risk levels, economic policy uncertainty and stock market volatility over the low frequency bands. The effect of the COVID-19 on the geopolitical risk substantially higher than on the US economic uncertainty. The COVID-19 risk is perceived differently over the short and the long-run and may be firstly viewed as an economic crisis. Our study offers several urgent prominent implications and endorsements for policymakers and asset managers.
  2. Lee Goi C
    Case Stud Chem Environ Eng, 2020 Sep;2:100027.
    PMID: 38620659 DOI: 10.1016/j.cscee.2020.100027
    Data in 2016 and 2017 has shown that most of Malaysia's river water quality was in Water Quality Index Class II and Class III. The implementation of the Movement Control Order (MCO) has restricted business activities, human movements as well as anthropogenic activities. The sudden decline in human activities has directly impacted the river water quality. Several observations conducted by reporters of local newspapers, reports released by the Department of Environment (DoE) and Ministry of Environment and Water have shown positive changes in water river quality.
  3. Uddin MH, Mollah S, Ali MH
    Int Rev Financ Anal, 2020 Nov;72:101587.
    PMID: 38620708 DOI: 10.1016/j.irfa.2020.101587
    CyberTech has drawn academic attention in the aftermath of the global financial crisis (GFC) as banks were forced to embrace CyberTech more aggressively to cope with market competition after the crisis. Banks can improve their operational efficiency and quality of service by relying on CyberTech, but they become more vulnerable to cybersecurity. Thus, increasing investment in CyberTech becomes a strategic necessity for banks to combat cybersecurity hazards. The study investigates how disruptive digital transformation affects bank stability. In particular, it examines whether the law of diminishing marginal returns from overspending on CyberTech affects bank stability. Based on a global sample from 43 countries, we find that an increase in CyberTech spending above the threshold level adversely affects the stability of banks. The main reason behind the adverse effect of CyberTech spending on the stability of banks is that banks take more than the proportional risk for every dollar they spend on disruptive CyberTech after they cross a threshold level of spending. While results persist across sub-samples, our results indicate two important channels of technological regimes - a diminishing returns regime and an increasing returns regime. The diminishing returns regime improves bank stability through more aggressive spending on technology, and the increasing returns regime makes banks more unstable due to excess spending on disruptive CyberTech. The study has implications for cybersecurity and sustainable CyberTech spending for banks.
  4. Qasuria TA, Fatima N, Karimov KS, Ibrahim MA
    J Mater Res Technol, 2020;9(6):12795-12803.
    PMID: 38620721 DOI: 10.1016/j.jmrt.2020.09.025
    The present situation of COVID-19 diverted our focus towards utilizing the degraded solar cells for sensor application, this will help in global energy harvesting. So, here is our successful effort to reuse already degraded solar cells as ultraviolet (UV) and infrared (IR) sensor. The spin-coated perovskite (CH3NH3PbI3-XClX) has been already tested for visible light spectrum, as an extension to that now it is utilized as UV and IR intensity sensors to cover the whole spectrum. The employed CH3NH3PbI3-XClX material was used after its efficiency loss has been reached to a saturation point in photovoltaic devices. Each deposited layer was investigated from UV to the IR absorption spectrum for deepening study through UV-vis spectroscopy. In the sandwiched architecture possessing FTO/PEDOT: PSS/Perovskite/PC61BM/CdS/Au symmetry, the perovskite film has been employed as an absorbent layer, however, other layers participation also plays a key role. The resultant device yielded very good sensing performance because of the enhanced excitons generation which is attributed to the precise selection of the interfacial materials, e.g. CdS and PC61BM as an ETM and PEDOT: PSS as HTM. The impedance and capacitance of the devices within 0.01-200 kHz under varied UV and IR illumination intensities were investigated. Measurements showed that as the intensity of the light increased i.e., UV (0-200 W/m2) and IR (0-5800 W/m2), impedance decreased while capacitance increased. The current results are attributed to the increase in the concentration of charges i.e., electron-hole pairs generation depending on the built-in capacitance and frequency of the charges.
  5. Mohamed WAS, Ismail NZ, Omar EA, Abdul Samad N, Adam SK, Mohamad S
    PMID: 33381215 DOI: 10.1155/2020/8895262
    INTRODUCTION: Propolis has been used traditionally in several countries for treating various diseases as it possessed healing properties including antioxidant and anticancer qualities. In Peninsular Malaysia, Tetrigona apicalis is one of the species of stingless bees mainly found in virgin jungle reserves which largely contribute to propolis production. Therefore, this study is designed to evaluate the phytochemical contents, antioxidant properties, and the cytotoxic effect of ethanolic crude of propolis extract against MCF7 and MCF 10A cell lines.

    METHOD: The ethanolic extract of propolis (EEP) was extracted using 80% ethanol. Identification of phytochemical contents and antioxidant properties of EEP was analysed by gas chromatography-mass spectrometry (GC-MS) and using 2, 2'-azinobis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) method, respectively. The EEP cytotoxic activity was evaluated on MCF7 and MCF 10A using 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay.

    RESULTS: Phytochemical contents of EEP demonstrated 28 compounds in which caryophyllene (99%), β-amyrin (96%), α-amyrin (93%), and caryophyllene oxide (93%) were the main compounds. The percentage of ABTS+ scavenging activity of EEP showed an inhibition of 9.5% with half-inhibitory concentration (IC50) value of 1.68 mg/mL. The EEP reduced MCF7 cells viability at IC50 value of 62.24 μg/mL, 44.15 μg/mL, and 32.70 μg/mL at 24, 48, and 72 hours, respectively. The IC50 value of MCF 10A was 49.55 μg/mL, 56.05 μg/mL, and 72.10 μg/mL at 24, 48, and 72 hours, respectively. The EEP cytotoxic effect of T. apicalis was more selective towards MCF7 at 72-hour incubation with a selectivity index (SI) of 2.20.

    CONCLUSION: The EEP has been shown to have antioxidants and potential bioactive compounds and inhibited proliferation of the MCF7 cells. Further studies on the EEP role in the apoptosis pathway and its screening towards other cell lines will be evaluated.

  6. Al-Kandari AM, Alenezi A
    Urol Ann, 2020;12(4):314-318.
    PMID: 33776325 DOI: 10.4103/UA.UA_48_20
    PURPOSE: Male infertility represents 50% of all infertility problems. The management of male infertility is expensive, causing a huge burden on the patients. In this study, we aimed to calculate the cost burden of male infertility investigations and treatments.

    METHODS: A total of 600 infertile male patients from a single center in Kuwait city were asked to fulfill an internet-based survey. The survey encompassed data about the cost of different investigations and treatments of male infertility. Patients were also asked about the preference of covering their condition either through government or by private insurance.

    RESULTS: A total of 145 patients responded to the survey. Most of the patients earned 3295 United States Dollar (USD) to 6590 USD per month. The cost of the outpatient visit ranged from 131.7 to 263.4 USD. The cost of each hormonal test was 164.5 USD while the average cost of each imaging study was 131.8-164.7 USD. Most of the patients (62.8%) received medical therapy with an expense of >988.74 USD. Varicocelectomy cost ranged from 3295 to 6590 USD while the cost of testicular sperm extraction ranged from 1644 to 3294 USD. Most patients (96.3%) did not have health insurance coverage of infertility. On average, patients spent around 18% of their annual income on infertility care, excluding major surgeries.

    CONCLUSION: Male infertility is a worrisome medical condition that causes a huge burden on the Kuwait community. Effective management necessitates insurance coverage and public health support owing to the huge financial burden on the patients and their partners. Thus, policymakers should re-evaluate their protocols of spending on male infertility care.

  7. Suvorov A, Pilsner JR, Naumov V, Shtratnikova V, Zheludkevich A, Gerasimov E, et al.
    Int J Mol Sci, 2020 Nov 04;21(21).
    PMID: 33158036 DOI: 10.3390/ijms21218252
    Advanced paternal age at fertilization is a risk factor for multiple disorders in offspring and may be linked to age-related epigenetic changes in the father's sperm. An understanding of aging-related epigenetic changes in sperm and environmental factors that modify such changes is needed. Here, we characterize changes in sperm small non-coding RNA (sncRNA) between young pubertal and mature rats. We also analyze the modification of these changes by exposure to environmental xenobiotic 2,2',4,4'-tetrabromodiphenyl ether (BDE-47). sncRNA libraries prepared from epididymal spermatozoa were sequenced and analyzed using DESeq 2. The distribution of small RNA fractions changed with age, with fractions mapping to rRNA and lncRNA decreasing and fractions mapping to tRNA and miRNA increasing. In total, 249 miRNA, 908 piRNA and 227 tRNA-derived RNA were differentially expressed (twofold change, false discovery rate (FDR) p ≤ 0.05) between age groups in control animals. Differentially expressed miRNA and piRNA were enriched for protein-coding targets involved in development and metabolism, while piRNA were enriched for long terminal repeat (LTR) targets. BDE-47 accelerated age-dependent changes in sncRNA in younger animals, decelerated these changes in older animals and increased the variance in expression of all sncRNA. Our results indicate that the natural aging process has profound effects on sperm sncRNA profiles and this effect may be modified by environmental exposure.
    MeSH terms: Aging/physiology*; Animals; Animals, Newborn; Female; Flame Retardants/toxicity*; Male; Paternal Age; Pregnancy; Prenatal Exposure Delayed Effects/chemically induced; Prenatal Exposure Delayed Effects/genetics; Prenatal Exposure Delayed Effects/metabolism; Spermatozoa/drug effects; Spermatozoa/metabolism*; Time Factors; Rats, Wistar; Gene Expression Regulation, Developmental/drug effects; Parturition/drug effects; Parturition/genetics; Parturition/metabolism; Rats; RNA, Small Untranslated/genetics*; RNA, Small Untranslated/metabolism
  8. R Murad A, Iraqi A, Aziz SB, N Abdullah S, Brza MA
    Polymers (Basel), 2020 Nov 09;12(11).
    PMID: 33182241 DOI: 10.3390/polym12112627
    In this review paper, we present a comprehensive summary of the different organic solar cell (OSC) families. Pure and doped conjugated polymers are described. The band structure, electronic properties, and charge separation process in conjugated polymers are briefly described. Various techniques for the preparation of conjugated polymers are presented in detail. The applications of conductive polymers for organic light emitting diodes (OLEDs), organic field effect transistors (OFETs), and organic photovoltaics (OPVs) are explained thoroughly. The architecture of organic polymer solar cells including single layer, bilayer planar heterojunction, and bulk heterojunction (BHJ) are described. Moreover, designing conjugated polymers for photovoltaic applications and optimizations of highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) energy levels are discussed. Principles of bulk heterojunction polymer solar cells are addressed. Finally, strategies for band gap tuning and characteristics of solar cell are presented. In this article, several processing parameters such as the choice of solvent(s) for spin casting film, thermal and solvent annealing, solvent additive, and blend composition that affect the nano-morphology of the photoactive layer are reviewed.
  9. Moosavi S, Li RYM, Lai CW, Yusof Y, Gan S, Akbarzadeh O, et al.
    Nanomaterials (Basel), 2020 Nov 27;10(12).
    PMID: 33261010 DOI: 10.3390/nano10122360
    In this study, activated carbon (AC) from coconut shell, as a widely available agricultural waste, was synthesised in a simple one-step procedure and used to produce a magnetic Fe3O4/AC/TiO2 nano-catalyst for the degradation of methylene blue (MB) dye under UV light. Scanning electron microscopy revealed that TiO2 nanoparticles, with an average particle size of 45 to 62 nm, covered the surface of the AC porous structure without a reunion of its structure, which according to the TGA results enhanced the stability of the photocatalyst at high temperatures. The photocatalytic activities of synthesised AC, commercial TiO2, Fe3O4/AC, and Fe3O4/AC/TiO2 were compared, with Fe3O4/AC/TiO2 (1:2) exhibiting the highest catalytic activity (98%). Furthermore, evaluation of the recovery and reusability of the photocatalysts after treatment revealed that seven treatment cycles were possible without a significant reduction in the removal efficiency.
  10. Salikin NH, Nappi J, Majzoub ME, Egan S
    Microorganisms, 2020 Dec 11;8(12).
    PMID: 33322253 DOI: 10.3390/microorganisms8121963
    Parasitic nematode infections cause debilitating diseases and impede economic productivity. Antinematode chemotherapies are fundamental to modern medicine and are also important for industries including agriculture, aquaculture and animal health. However, the lack of suitable treatments for some diseases and the rise of nematode resistance to many available therapies necessitates the discovery and development of new drugs. Here, marine epiphytic bacteria represent a promising repository of newly discovered antinematode compounds. Epiphytic bacteria are ubiquitous on marine surfaces where they are under constant pressure of grazing by bacterivorous predators (e.g., protozoans and nematodes). Studies have shown that these bacteria have developed defense strategies to prevent grazers by producing toxic bioactive compounds. Although several active metabolites against nematodes have been identified from marine bacteria, drug discovery from marine microorganisms remains underexplored. In this review, we aim to provide further insight into the need and potential for marine epiphytic bacteria to become a new source of antinematode drugs. We discuss current and emerging strategies, including culture-independent high throughput screening and the utilization of Caenorhabditis elegans as a model target organism, which will be required to advance antinematode drug discovery and development from marine microbial sources.
  11. Gooding HC, Ning H, Perak AM, Allen N, Lloyd-Jones D, Moore LL, et al.
    Prev Med Rep, 2020 Dec;20:101276.
    PMID: 33344149 DOI: 10.1016/j.pmedr.2020.101276
    Adolescence is a critical time for the preservation or loss of cardiovascular health. We aimed to describe trajectories of cardiovascular health in adolescent girls and identify early adolescent factors associated with cardiovascular health in young adulthood. We used data from the National Growth and Health Study, a longitudinal cohort of 2,379 girls followed annually from ages 9-19 years. We classified participants as having ideal, intermediate, or poor levels of the seven cardiovascular health metrics at four developmental stages: early (ages 9-11), middle (ages 12-14), and late (ages 15-17) adolescence, and early young adulthood (ages ≥ 18). We calculated total cardiovascular health scores (range 0-14) at each stage and empirically identified patterns of cardiovascular health trajectories. We examined associations between trajectory group membership and various demographic, behavioral, and physiological factors. Mean cardiovascular health scores declined with age from 10.8 to 9.4 in white girls and 10.3 to 8.9 in black girls; 17% of white girls and 23% of black girls had low cardiovascular health (score 
  12. Gorokhov G, Bychanok D, Gayduchenko I, Rogov Y, Zhukova E, Zhukov S, et al.
    Polymers (Basel), 2020 Dec 18;12(12).
    PMID: 33353036 DOI: 10.3390/polym12123037
    Polymer composites containing nanocarbon fillers are under intensive investigation worldwide due to their remarkable electromagnetic properties distinguished not only by components as such, but the distribution and interaction of the fillers inside the polymer matrix. The theory herein reveals that a particular effect connected with the homogeneity of a composite manifests itself in the terahertz range. Transmission time-domain terahertz spectroscopy was applied to the investigation of nanocomposites obtained by co-extrusion of PLA polymer with additions of graphene nanoplatelets and multi-walled carbon nanotubes. The THz peak of permittivity's imaginary part predicted by the applied model was experimentally shown for GNP-containing composites both below and above the percolation threshold. The physical nature of the peak was explained by the impact on filler particles excluded from the percolation network due to the peculiarities of filler distribution. Terahertz spectroscopy as a versatile instrument of filler distribution diagnostics is discussed.
  13. Anas NAA, Fen YW, Yusof NA, Omar NAS, Ramdzan NSM, Daniyal WMEMM
    Materials (Basel), 2020 Jun 06;13(11).
    PMID: 32517196 DOI: 10.3390/ma13112591
    The modification of graphene quantum dots (GQDs) may drastically enhance their properties, therefore resulting in various related applications. This paper reported the preparation of novel cetyltrimethylammonium bromide/hydroxylated graphene quantum dots (CTAB/HGQDs) thin film using the spin coating technique. The properties of the thin film were then investigated and studied. The functional groups existing in CTAB/HGQDs thin film were confirmed by the Fourier transform infrared (FTIR) spectroscopy, while the atomic force microscope (AFM) displayed a homogenous surface of the thin film with an increase in surface roughness upon modification. Optical characterizations using UV-Vis absorption spectroscopy revealed a high absorption with an optical band gap of 4.162 eV. Additionally, the photoluminescence (PL) spectra illustrated the maximum emission peak of CTAB/HGQDs thin film at a wavelength of 444 nm. The sensing properties of the as-prepared CTAB/HGQDs thin film were studied using a surface plasmon resonance technique towards the detection of several heavy metal ions (HMIs) (Zn2+, Ni2+, and Fe3+). This technique generated significant results and showed that CTAB/HGQDs thin film has great potential for HMIs detection.
  14. Mat Zaid MH, Abdullah J, Rozi N, Mohamad Rozlan AA, Abu Hanifah S
    Nanomaterials (Basel), 2020 Jul 10;10(7).
    PMID: 32664193 DOI: 10.3390/nano10071346
    A simple and sensitive aptasensor based on conductive carbon nanodots (CDs) was fabricated for the detection of 17ß-Estradiol (E2). In the present study, the hydrothermal synthesis of carbon nanodots was successfully electrodeposited on a screen-printed electrode (SPE) as a platform for immobilization of 76-mer aptamer probe. The morphology and structure of the nanomaterial were characterized by UV-visible absorption spectra, Fluorescence spectra, Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). Moreover, cyclic voltammetry and electrochemical impedance spectroscopy were used to investigate the electrochemical performance of the prepared electrodes. Subsequently, impedimetric (EIS) measurements were employed to investigate the relative impedances changes before and after E2 binding, which results in a linear relationship of E2 concentration in the range of 1.0 × 10-7 to 1.0 × 10 -12 M, with a detection limit of 0.5 × 10-12 M. Moreover, the developed biosensor showed high selectivity toward E2 and exhibited excellent discrimination against progesterone (PRG), estriol (E3) and bisphenol A (BPA), respectively. Moreover, the average recovery rate of spiked river water samples with E2 ranged from 98.2% to 103.8%, with relative standard deviations between 1.1% and 3.8%, revealing the potential application of the present biosensor for E2 detection in water samples.
  15. Ng ESY, Wong PY, Kamaruddin ATH, Lim CTS, Chan YM
    Int J Environ Res Public Health, 2020 Jul 16;17(14).
    PMID: 32708766 DOI: 10.3390/ijerph17145144
    Despite optimal control of serum phosphate level being imperative to avoid undesirable health outcomes, hyperphosphataemia is a highly prevalent mineral abnormality among the dialysis population. This study aimed to determine factors associated with hyperphosphatemia among hemodialysis patients in Malaysia. Multiple linear regression analysis was used to ascertain the possible factors that influence serum phosphate levels. A total of 217 hemodialysis patients were recruited. Hyperphosphatemia was prevalent. Only approximately 25% of the patients were aware that optimal control of hyperphosphatemia requires the combined effort of phosphate binder medication therapy, dietary restriction, and dialysis prescription. The presence of diabetes mellitus may affect serum phosphate levels, complicating dietary phosphorus management. Patients who were less depressive portrayed higher serum phosphate levels, implying intentional non-compliance. Better compliance on phosphate binder, longer sleep duration, and higher social support was associated with a lower level of serum phosphate. Despite sleep disturbance being one of the most prevalent and intense symptom burdens identified by hemodialysis patients, relatively few studies have addressed this issue. It is time to formulate sleep therapeutic interventions besides the encouragement of strong social support, hoping which many clinical outcomes including hyperphosphatemia can be better controlled among hemodialysis patients.
    MeSH terms: Female; Renal Dialysis; Humans; Malaysia/epidemiology; Male; Middle Aged; Phosphates; Sleep; Social Support
  16. Mulyati S, Muchtar S, Arahman N, Meirisa F, Syamsuddin Y, Zuhra Z, et al.
    Polymers (Basel), 2020 Aug 12;12(8).
    PMID: 32806565 DOI: 10.3390/polym12081807
    This paper reports the fabrication of polyethersulfone membranes via in situ hydrogen peroxide-assisted polymerization of dopamine. The dopamine and hydrogen peroxide were introduced into the dope solution where the polymerization occurred, resulting in a single-step additive formation during membrane fabrication. The effectivity of modification was evaluated through characterizations of the resulting membranes in terms of chemical functional groups, surface morphology, porosity, contact angle, mechanical strength and filtration of humic acid solution. The results confirm that the polydopamine was formed during the dope solution mixing through peroxide-assisted polymerization as proven by the appearance of peaks associated OH and NH groups in the resulting membranes. The presence of polydopamine residual in the membrane matric enhances the pore properties in terms of size and porosity (by a factor of 10), and by lowering the hydrophilicity (from 69° to 53°) which leads to enhanced filtration flux of up to 217 L/m2 h. The presence of the residual polydopamine also enhances membrane surface hydrophilicity which improve the antifouling properties as shown from the flux recovery ratio of > 80%.
  17. Brza MA, Aziz SB, Nofal MM, Saeed SR, Al-Zangana S, Karim WO, et al.
    Polymers (Basel), 2020 Aug 21;12(9).
    PMID: 32825679 DOI: 10.3390/polym12091885
    In the present work it was shown that low lattice energy ammonium salts are not favorable for polymer electrolyte preparation for electrochemical device applications. Polymer blend electrolytes based on chitosan:poly(ethylene oxide) (CS:PEO) incorporated with various amounts of low lattice energy NH4BF4ammonium salt have been prepared using the solution cast technique. Both structural and morphological studies were carried out to understand the phenomenon of ion association. Sharp peaks appeared in X-ray diffraction (XRD) spectra of the samples with high salt concentration. The degree of crystallinity increased from 8.52 to 65.84 as the salt concentration increased up to 40 wt.%. These are correlated to the leakage of the associated anions and cations of the salt to the surface of the polymer. The structural behaviors were further confirmed by morphological study. The morphological results revealed the large-sized protruded salts at high salt concentration. Based on lattice energy of salts, the phenomena of salt leakage were interpreted. Ammonium salts with lattice energy lower than 600 kJ/mol are not preferred for polymer electrolyte preparation due to the significant tendency of ion association among cations and anions. Electrical impedance spectroscopy was used to estimate the conductivity of the samples. It was found that the bulk resistance increased from 1.1 × 104 ohm to 0.7 × 105 ohm when the salt concentration raised from 20 wt.% to 40 wt.%, respectively; due to the association of cations and anions. The low value of direct current (DC) conductivity (7.93 × 10-7 S/cm) addressed the non-suitability of the electrolytes for electrochemical device applications. The calculated values of the capacitance over the interfaces of electrodes-electrolytes (C2) were found to drop from 1.32 × 10-6 F to 3.13 × 10-7 F with increasing salt concentration. The large values of dielectric constant at low frequencies are correlated to the electrode polarization phenomena while their decrements with rising frequency are attributed to the lag of ion polarization in respect of the fast orientation of the applied alternating current (AC) field. The imaginary part of the electric modulus shows obvious peaks known as conduction relaxation peaks.
  18. Manchanda Y, Das S, De A
    Indian J Dermatol, 2020;65(4):251-258.
    PMID: 32831363 DOI: 10.4103/ijd.IJD_360_20
    Coronavirus disease of 2019 (COVID-19) pandemic has affected India and the world as a whole, like nothing in the recent history and we, dermatologists, are also affected directly or indirectly. In this review, we have tried to address the COVID-19-related information we need to be aware of as a health-care professional. We have discussed the relevant details of the disease: the agent, the symptomatology, common preventive measures, investigations, and management outline. We have also discussed the implications of COVID-19 in dermatology practice and given a basic guideline for dermatology practice during the pandemic.
  19. Voruganti S, Haricharan PB, Mudrakola DP, Turagam N
    J Int Soc Prev Community Dent, 2020;10(4):410-414.
    PMID: 33042881 DOI: 10.4103/jispcd.JISPCD_217_19
    BACKGROUND: Accurate diagnosis, reporting of caries and its consequences, is absolute mandate for planning an efficient, effective community health-care program. Literature reports indicate shortcomings of existing caries assessment tools. Caries assessment spectrum and treatment (CAST) is novice caries quantification tool, which quantifies the entire spectrum of carious lesions. This tool records give an insight into the status of restorations along with various progressive developmental stages of dental caries. This instrument has been validated for face, content, and construct by an expert group, and currently, its usage is on the rise.

    AIM: The aim of this study was to report the reliability of this assessment tool with regard to the primary and permanent dentition of school children and adults belonging to a south Indian district.

    MATERIALS AND METHODS: A cross-sectional study was carried out by two trained and calibrated examiners by examining 192 school children in the age-group between 4 and 6 years and 262 adults between 19 and 69 years. The study sample was reexamined by the same examiners after a gap of 4 weeks. The κ coefficient values and percent of agreement were calculated for the data recorded from the study subjects.

    RESULTS: The analyzed data showed moderate intra-examiner and inter-examiner reproducibility for either of the dentition as revealed by κ coefficient values (0.80-0.89). Inter- or intra-examiner agreement was found to be substantial to almost perfect (percent agreement above 90%) with respect to both the age-groups.

    CONCLUSION: The CAST tool seems quite promising to be the future for quantifying caries spectrum for a community or an individual.

  20. BenGhasheer HF, Saub R
    J Int Soc Prev Community Dent, 2020;10(4):520-531.
    PMID: 33042896 DOI: 10.4103/jispcd.JISPCD_192_20
    AIM: This study aimed to investigate the relationships between acculturative stress, perceived stress, social support, and subjective oral health outcomes among international graduate students in Malaysian public universities.

    MATERIALS AND METHODS: A total of 312 international graduate students completed a web-based questionnaire, including measures of acculturative stress (ASSIS-36), perceived stress scale (PSS-4), social support (MSPSS-12), oral health perceptions (global rating item), and oral health-related quality of life (OHRQoL, OIDP-8). The hypotheses of the conceptual model were tested using structural equation modeling-partial least squares (SEM-PLS) with the support of SmartPLS.

    RESULTS: Twenty-seven percent (27.1%) of the variance in OHRQoL was explained by acculturative stress, perceived stress, social support, and oral health perceptions. The path coefficient between oral health perception and OHRQoL was the strongest (β = -0.385, P < 0.001). Acculturative stress directly influenced OHRQoL (β = 0.20, P = 0.009) and indirectly through perceived stress (β = 0.05, P = 0.019). Social support mediated the relationship between perceived stress and OHRQoL (β = 0.046, P = 0.02). The overall predictive power of the model was 23%.

    CONCLUSION: Results indicated that acculturative stress, perceived stress, and social support are among the predictors of OHRQoL. Oral health perceptions and acculturative stress were the most significant predictors that contributed the largest amount to the model. The findings emphasize the potential role of psychosocial factors in relation to oral health. The empirical evidence of this study could facilitate the planning of targeted strategies that address stress reduction and social support. Such strategies might be a new promising way to enhance OHRQoL as these elements can be modified and response to interventions.

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