Investigating Some Properties of Nanocomposites for Dental Restoration Materials

In this work, it was evaluated the wear resistance, hardness, and surface roughness values of resin-based composites that applied in dentistry as restorative materials. The resin composites were made from six types of resin matrixes (A, B, C, D, E, and F) and each one of them has contained different types and ratios of monomers as well as the inorganic nano-fillers (SiO2, ZrO2, HA, and Al2O3). For each test, thirty specimens were prepared, which were classified into six groups depending on the types of the resin matrix and fillers used in the composites. The results prove that the nanocomposites that have the lowest rate of wear were the group E which was derived from the resin matrix of the group E that has monomers are (BIS-GMA, meth acrylamide, methacrylic acid, and 1-6 hexanediol methacrylate) with values range from 8.11 to 6.11 mm3/mm depending on the filler type material. All prepared composites resin materials (A to F) showed an increase in their hardness values as regards the reference, group D showed the highest hardness value followed by group B while group C was the lowest. The highest mean roughness was shown in groups A and F with 0.82 and 0.79 μm respectively, while the smoother surfaces among all groups were groups B and D which had significantly fewer roughness values of 0.16 and 0.19 μm respectively

Effects of primary stored energy on relaxation behavior of high entropy bulk metallic glasses under compressive elastostatic loading

This paper aims to show the effects of primary stored energy in high entropy bulk metallic glasses (HE-BMGs) on their relaxation behavior after elastostatic loading process. For this purpose, three HE-BMGs with different chemical compositions and primary stored energy were fabricate

Histopathological Study of Liraglutide on Renal Deterioration Progression Induced by Doxorubicin

Podocyte injury is a major factor in many renal diseases leading to proteinuria that causes the risk of developing kidney deterioration. Glomerulosclerosis and tubulointerstitial fibrosis are the main histopathological feature as consequence of inflammation and apoptosis a result of   long period of tubular protein load. Liraglutide an incretin hormone (GLP-1) analogue has effective as glycemic control in patient with type 2 diabetes. In recent years, liraglutide appear protected mechanism against inflammation and apoptosis for many tissues through GLP-1 receptor (GLP-1R) activation unrelated with glycemic control.  36 animal Wister rats used in this experiment, first group include 12 rats set as control group received just the normal saline, while second group include 24 rats induced podocyte injury by doxorubicin single dose and third group treated either normal saline or liraglutide (200 µg /kg/day I.P) for 28 days.  Histopathological study is used to assess the protected effect of liraglutide on podocyte injury induced in male rats through three main histopathological changes (glomerulosclerosis, tubular damage, inflammatory infiltration) by Hematoxylin and eosin staining. In this study treatment group(C) with liraglutide appeared significant decreased (P< 0.05) in glomerulosclerosis, tubulointerstitial, and inflammatory infiltration after 28 day of treatment. In conclusion, liraglutide is effective in reducing inflammation and apoptosis which associate with chronic renal development as well as renoprotection by glycemic control which is indirectly effect

العوامل الاقتصادية والتنظيمية المؤثرة في تولي المرأة الموظفة للمواقع القيادية في وزارة التربية والتعليم الفلسطينية

This study aimed to identify Economic and organizational factors affecting the occupying of womenemployees to leadership positions in the Palestinian Ministry of Education, and to identify the effect of the variables of job classification, qualification, and experiences. The study population consisted of (278) women employees at the Palestinian Ministry of Education and the sample was (79) employees, and they were selected in a simple random method. A questionnaire was designed consisting of (26) paragraphs distributed on both the scale of economic and organizational factors and use the descriptive approach. The results showed that the degree of economic and organizational factors affecting the occupying of women employees to leadership positions in the Palestinian Ministry of Education was of a moderate degree, and there were no statistically significant differences at the level of significance (α≤ 0.05) in the role of economic and organizational factors affecting the occupying of womenemployees to leadership positions due to variables in job classification, qualification, and experiences. The study recommended the necessity of improving the professional and scientific competence of women to reach leadership position

The effect of serum and follicular fluid vitamin D on intracytoplasmic sperm injection outcome

Vitamin D is a cholesterol derived, fat soluble, steroid substance present in the body. It plays an important role in the female reproductive system and regulating its functions. It is believed that vitamin D improves the endometrial thickness. The relationship between the level of vitamin D and fertilization, embryo quality and Intracytoplasmic sperm injection outcome remains controversial till now. The aim of the study to assess the relation of vitamin D levels in serum and follicular fluid with Intracytoplasmic sperm injection outcome. Eighty-eight women were enrolled in this study. They were classified according to the cause of infertility into case group with female factor and control group with male factor. All women were undergoing Intracytoplasmic sperm injection procedure. Serum and follicular fluid vitamin D levels were measured on the day of oocyte retrieval. It was found that no significant differences in either serum or follicular fluid level of vitamin D between the case and control groups and higher serum and follicular fluid levels of vitamin D are associated with better pregnancy rates after Intracytoplasmic sperm injection. Further studies on vitamin D in male are required to prove its role in the Intracytoplasmic sperm injection. The present study concluded that no significant differences in either serum or follicular fluid level of vitamin D between the case and control groups and higher serum and follicular fluid levels of vitamin D are associated with better pregnancy rates after Intracytoplasmic sperm injection

Effects of incorporation of Eurycoma longifolia jack root extract on properties of heat cured acrylic resin

Aim: Herbal treatment has recently been validated as a safe and effective alternative to antimicrobial drugs due to its safety and efficiency. Eurycoma longifolia root jack root extract (E.L.) has been documented for its antibacterial and antifungal properties. Acrylic resin is used to produce dentures. However, due to its porous nature, it is a good site for Candida albicans to adhere and cause infection. The aim of the presented study was to evaluate the effects of adding E.L. root extract to acrylic resin on the properties of heat polymerized denture material. Materials and Methods: Sixty circular-shaped (30mm × 2mm) specimens were prepared from heatpolymerized acrylic resin in total. Then they were divided into one control group and two experimental groups, which were prepared by adding 0.5 gm of E.L. root extract to 10mL monomer. Polymer powder was added to the monomer. The conventional water bath method was used for mixing, packing, and processing. Specimens were polished and finished after processing, and then maintained for 48h in distilled water. Shore D, profilometer tester and color recognition sensor were employed to measure the surface hardness, roughness and color changes. Statistical analysis was conducted via independent sample t test. Results: The results indicated no significant change in roughness values concerning the study groups. Hardness results showed a higher mean value for the experimental group in compared to the control. However, the independent sample t test showed no significant change between the study groups. In color change test, no statistically significant change between experimental and control regarding red and green colors mean values whereas blue color mean values showed significant alteration and color change tests. Conclusion: The study concluded that E. longifolia root extract showed better surface hardness and no effect on color alteration and surface roughness after incorporation to heat cure acrylic resin, which means it can be used as a natural safe antimicrobial agent incorporated into the resin

Effects of Incorporation of Eurycoma longifolia Jack Root Extract on Properties of Heat Cured Acrylic Resin

Aim: Herbal treatment has recently been validated as a safe and effective alternative to antimicrobial drugs due to its safety and efficiency. Eurycoma longifolia root jack root extract (E.L.) has been documented for its antibacterial and antifungal properties. Acrylic resin is used to produce dentures. However, due to its porous nature, it is a good site for Candida albicans to adhere and cause infection. The aim of the presented study was to evaluate the effects of adding E.L. root extract to acrylic resin on the properties of heat polymerized denture material. Materials and Methods: Sixty circular-shaped (30 mm × 2 mm) specimens were prepared from heat-polymerized acrylic resin in total. Then they were divided into one control group and two experimental groups, which were prepared by adding 0.5 gm of E.L. root extract to 10 mL monomer. Polymer powder was added to the monomer. The conventional water bath method was used for mixing, packing, and processing. Specimens were polished and finished after processing, and then maintained for 48 h in distilled water. Shore D, profilometer tester and color recognition sensor were employed to measure the surface hardness, roughness and color changes. Statistical analysis was conducted via independent sample t test. Results: The results indicated no significant change in roughness values concerning the study groups. Hardness results showed a higher mean value for the experimental group in compared to the control. However, the independent sample t test showed no significant change between the study groups. In color change test, no statistically significant change between experimental and control regarding red and green colors mean values whereas blue color mean values showed significant alteration and color change tests. Conclusion: The study concluded that E. longifolia root extract showed better surface hardness and no effect on color alteration and surface roughness after incorporation to heat cure acrylic resin, which means it can be used as a natural safe antimicrobial agent incorporated into the resin

Diagnostic Accuracy of Various Radiological Measurements in the Evaluation and Differentiation of Flatfoot: A Cross-Sectional Study

Arch angle is used to indicate flatfoot, but in some cases, it is not easily defined. The presence of flatfoot deformity remains difficult to diagnose due to a lack of reliable radiographic assessment tools. Although various assessment methods for flatfoot have been proposed, there is insufficient evidence to prove the diagnostic accuracy of the various tools. The main purpose of the study was to determine the best radiographic measures for flatfoot concerning the arch angle. Fifty-two feet radiographs from thirty-two healthy young females were obtained. Five angles and one index were measured using weight-bearing lateral radiographs; including arch angle, calcaneal pitch (CP), talar-first metatarsal angle (TFM), lateral talar angle (LTA), talar inclination angle (TIA) and navicular index (NI). Receiver-operating characteristics were generated to evaluate the flatfoot diagnostic accuracy for all radiographic indicators and Matthews correlation coefficient was calculated to determine the cutoff value for each measure. The strongest correlation was between arch angle and CP angle [r = &minus;0.91, p &le; 0.0001, 95% confidence interval (CI) (from &minus;0.94 to &minus;0.84)]. Also, significant correlations were found between arch angle and NI [r = 0.62, p &le; 0.0001, 95% CI (0.42 to 0.76)], and TFM [r = 0.50, p &le; 0.0001, 95% CI (from 0.266 to 0.68)]. Furthermore, CP (cutoff, 12.40) had the highest accuracy level with value of 100% sensitivity and specificity followed by NI, having 82% sensitivity and 89% specificity for the cutoff value of 9.90. In conclusion, CP angle is inversely correlated with arch angle and considered a significant indicator of flatfoot. Also, the NI is easy to define radiographically and could be used to differentiate flat from normal arched foot among young adults