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Search Results: 1 - 10 of 224052 matches for " Nasrin R. Sadaqah "
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Ceramic Laminate Veneers: Materials Advances and Selection  [PDF]
Nasrin R. Sadaqah
Open Journal of Stomatology (OJST) , 2014, DOI: 10.4236/ojst.2014.45038
Abstract: Porcelain laminate veneers have been a common treatment strategy in dental clinics. It is a conservative method for treatment of esthetic and functional problems in anterior region of oral cavity. Wide range of dental ceramics is now available on market for fabrication of laminate veneers. Clinician should have enough knowledge regarding the composition and properties of these materials in order to be able to choose the appropriate one according to clinical situations.
Management of Patient with Hypodontia: Review of Literature and Case Report  [PDF]
Nasrin R. Sadaqah, Jawad Abu Tair
Open Journal of Stomatology (OJST) , 2015, DOI: 10.4236/ojst.2015.512036
Abstract: Hypodontia is defined as the developmental absence of one or more teeth which can affect both the primary and permanent dentition. During the diagnosis procedure several other dental and oral symptoms can be observed. However esthetic and psychological problems require special attention for these patients, considering that they are often associated with low self-esteem and problems of social acceptance. The optimal therapy should include an interdisciplinary team approach. This review aimed to find out prevalence, causes, clinical manifestations, and treatment modalities of hypodontia. A case report describes that the treatment planning for a patient suffering from oligodontia is introduced at the end of the review. A specialist with the patient together made the decision regarding treatment.
Porcelain fracture of metal-ceramic tooth-supported and implant-supported restorations: A review  [PDF]
Rola M. Shadid, Nasrin R. Sadaqah, Layla Abu-Naba’a, Wael M. Al-Omari
Open Journal of Stomatology (OJST) , 2013, DOI: 10.4236/ojst.2013.38069
Abstract:

Metal-ceramic restorations are widely used in dentistry with a high degree of general success. However, fracture of these restorations does occur and usually frustrates both the dentist and the patient. Objective: This literature review discusses the factors that may lead to the fracture of these restorations whether they are tooth-supported or implant-supported with the aim of making dentists and technicians aware of these factors to avoid them. Factors reviewed include: technical factors, dentist-related factors, inherent material properties, direction, magnitude and frequency of applied loads, environmental factors, screw-retained implant-supported restorations, and posterior cantilevered prostheses. Material and Methods: A netbased search in “Pubmed” was performed and combined with a manual search. The search was limited to articles written in English. Conclusions: the published literature revealed that the factors predisposing to fracture of metal-ceramic restorations may be related to the technician, dentist, patient, environment, design of the restoration, or to inherent structure of ceramics and others. However, if the dentist and technician understand these factors and respect the physical characteristics of the materials, most of those are avoidable.

Effect of radiation on convective flow in a tilted solar collector filled with water-alumina nanofluid
R Nasrin, MA Alim
International Journal of Engineering, Science and Technology , 2012,
Abstract: The effect of radiation on natural convective flow inside a solar collector having a flat-plate cover and a sine-wave absorber is analyzed numerically. The solar collector is filled with water-Al2O3 nanofluid. The governing differential equations with boundary conditions are solved by the Penalty Finite Element Method using Galerkin’s weighted residual scheme. The effects of radiation (ε) and tilted angle (ψ) on the flow and heat transfer characteristics are simulated. In addition average Nusselt number, average temperature and mean velocity field for nanofluid within the collector are presented graphically for the governing parameters mentioned above. The highest heat transfer rate is observed for the largest ε and absence of ψ. The Al2O3 nanoparticles with the highest ε and in absence of ψ are established to be most effective in enhancing performance of heat transfer rate. Moreover, increasing tilted angle ψ and lessening emissivity ε cause decrease of average fluid temperature. For growing both parameters mean velocity field increases.
Influence of Rice Straw Incorporation on the Microbial Biomass and Activity in Coastal Saline Soils of Bangladesh  [PDF]
Nasrin Chowdhury
Open Journal of Soil Science (OJSS) , 2016, DOI: 10.4236/ojss.2016.610016
Abstract: Coastal soils of Bangladesh are affected by salinity. This study investigated salinity as a stress factor on coastal soils in Bangladesh. It was also observed if incorporation of rice straw could remediate negative impacts of soil salinity (if any) on microbial activ-ity. The microbial biomass carbon ranged from 137.85 to 614.88 μg/g among the soils (n = 11). Microbial biomass carbon content and number of both cultivable bacteria and fungi decreased in the soils with higher ECes (electrical conductivity). Respiration was measured over 30 days with each soil pre incubated at 50% of water holding capacity. Basal respiration rate as well as soil organic carbon content (r = 0.88, p < 0.05) increased with increasing ECe of soils. The cumulative basal soil respiration was higher in the soils with higher salinity (4.81 - 37.73 mS/cm) (12.91 - 16.89 mg CO2/g dry soil) than in the nonsaline soils (0.98 - 2.33 mS/cm) (5.79 - 6.51 mg CO2/g dry soil). Application of rice straw at 0.50%, 1.00%, 1.50% and 2.00% reduced the negative impact of soil salinity especially at higher ECes (6.63 - 37.73 mS/cm). Application of 1.00% rice straw appeared to be acceptable for successful amelioration of saline soils of the study area.
Free convective phenomena in a tilted enclosure filled with water-Al2O3 nanofluid
R Nasrin, S Parvin, MA Alin
International Journal of Engineering, Science and Technology , 2012,
Abstract: The influences of Prandtl number and tilted angle of a partially heated inclined rectangular cavity on free convection flow phenomena with Soret and Dufour coefficients are analyzed numerically. The enclosure is filled with Al2O3 nanofluid. The top surface has constant temperature Tc, while bottom surface is partially heated Th, with Th > Tc. The concentration in top wall is maintained higher than bottom wall (Cc < Ch). The remaining bottom wall and the two vertical walls are considered adiabatic. Water is considered as the base fluid. By the Penalty Finite Element Method the governing equations are solved. The effects of the Prandtl number and tilted angle of enclosure on the flow pattern and heat and mass transfer have been depicted. Comprehensive average Nusselt and Sherwood numbers, average temperature and concentration and mid-height horizontal and vertical velocities inside the cavity are presented as functions of the governing parameters mentioned above. The structure of the fluid streamlines, isotherms and iso-concentrations within the enclosure is found to significantly depend upon the Pr and ψ. Average concentration and temperature increase slightly for growing ψ and falling Pr.
Prandtl number variation on transient forced convection flow in a fluid valve using nanofluid
R Nasrin, MA Alim, AJ Chamkha
International Journal of Engineering, Science and Technology , 2012,
Abstract: A transient numerical study is conducted to investigate the transport mechanism of forced convection in a fluid valve filled with water-CuO nanofluid. The flow enters from one inlet at the left with uniform temperature and velocity Ti and Ui, respectively, but can leave the valve through two outlets at the right. The upper and lower boundaries of the valve are heated with constant temperature Th while the remaining walls are perfectly insulated. The numerical approach is based on the finite element technique with Galerkin’s weighted residual simulation. Solutions are obtained for the variation of Prandtl number (Pr) while Reynolds number (Re) and solid volume fraction (φ ) are fixed at 100 and 5%. The streamlines, isotherm plots, the local and average Nusselt number, mean temperature of the fluids (base fluid and nanofluid) and subdomain velocity with the variation of non-dimensional time (τ) are presented and discussed. It is found that the rate of heat transfer in the fluid valve reduces for longer time periods.
Prosthetic reconstruction using gingiva-colored ceramic agent in fixed partial restoration in a 24-year old patient
Sadaqah NR, Abu Tair JA
Clinical, Cosmetic and Investigational Dentistry , 2012, DOI: http://dx.doi.org/10.2147/CCIDE.S36273
Abstract: osthetic reconstruction using gingiva-colored ceramic agent in fixed partial restoration in a 24-year old patient Case report (1015) Total Article Views Authors: Sadaqah NR, Abu Tair JA Published Date November 2012 Volume 2012:4 Pages 37 - 41 DOI: http://dx.doi.org/10.2147/CCIDE.S36273 Received: 23 July 2012 Accepted: 18 September 2012 Published: 30 November 2012 Nasrin R Sadaqah,1 Jawad Ali Abu Tair2 1Department of Prosthodontics, 2Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Arab American University, Jenin, Palestinian Territory Abstract: Achieving an optimal esthetic result when replacing missing anterior teeth with a fixed partial denture can be a challenge. This is especially true when interdisciplinary treatment is needed and the patient refuses this for personal or financial reasons. Here we report a clinical case where a fixed partial denture was used to change the incisor relationship and to restore the normal tooth and gingival tissue shape, morphology, and relationship by including artificial gingiva within the fixed partial denture when the patient refused lengthy and costly multispecialty treatment options.
Prosthetic reconstruction using gingiva-colored ceramic agent in fixed partial restoration in a 24-year old patient
Sadaqah NR,Abu Tair JA
Clinical, Cosmetic and Investigational Dentistry , 2012,
Abstract: Nasrin R Sadaqah,1 Jawad Ali Abu Tair21Department of Prosthodontics, 2Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Arab American University, Jenin, Palestinian TerritoryAbstract: Achieving an optimal esthetic result when replacing missing anterior teeth with a fixed partial denture can be a challenge. This is especially true when interdisciplinary treatment is needed and the patient refuses this for personal or financial reasons. Here we report a clinical case where a fixed partial denture was used to change the incisor relationship and to restore the normal tooth and gingival tissue shape, morphology, and relationship by including artificial gingiva within the fixed partial denture when the patient refused lengthy and costly multispecialty treatment options.Keywords: gingival porcelain, fixed partial denture, diagnostic waxup, provisional restoration
Surveying the Relationship between Psychological Disorders and Spending Time on Facebook  [PDF]
Nasrin Yeganeh Rad, Toozandehjani Hassan
Social Networking (SN) , 2017, DOI: 10.4236/sn.2017.62012
Abstract: Introduction: This research is a descriptive and correlational research which has been done with the purpose of surveying the relationship between mental disorders and the amount of time that people spend on Facebook. 147 members out of Facebook active users were chosen randomly. Then epidemiology questionnaire of mental disorders (SCL-90-R) was used to collect data. Data analysis was done using Spearman correlation coefficient and multiple regression. The results showed that there was a significant relation between characters such as aggression, obsession, psychosis, paranoia, depression and using Facebook (p < 0.05), but this relation was not significant in anxiety, interpersonal sensitivity, physical complaints and phobia. Furthermore, this relationship was significant regarding to subjects’ gender and marital status (p < 0.05), but there was no relationship regarding to their age.
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