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Article
CLEANING AND STERILIZATION EFFECT ON THE TORSIONAL PROPERTIES OF PROTAPER ROTARY TITANIUM COBALT (Ti-C0) ENDODONTIC INSTRUMENT
تأثير التنظيف والتعقيم على عزوم الالتواء لمادة التيتانيوم كوبالت المستخدمة في توسيع قنوات جذور الاسنان.

Author: Ibrahim H. Mukhlif ابراهيم حمد مخلف
Journal: Journal of university of Anbar for Pure science مجلة جامعة الانبار للعلوم الصرفة ISSN: ISSN: 19918941 Year: 2011 Volume: 5 Issue: 1 Pages: 37-40
Publisher: University of Anbar جامعة الانبار

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Abstract

This study was conducted to evaluate the effect of the number of cycles of cleaning using NaOCl solution of different concentration and sterilization using autoclave and dry heat oven on the torsional properties of rotary (Ti-Co) instruments. A total of forty five rotary protaper finisher instruments were divided into 3 groups: Group 1 were subjected to neither cleaning nor sterilization cycles and assigned as the control group. Group 2 and group 3 were subjected to 5 and 10 cleaning and sterilization cycles respectively, soaked within (2% and 5%) NaOCl, were sterilized with autoclave and dry heat oven. Then, all instruments were subjected to a clockwise torsional load until fracture, the torsional moment and angular deflection at fracture were calculated. The results show a significant reduction in the torsional strength after cleaning and sterilization cycles regardless the concentration of NaOCl, type and number of sterilization cycles. For the angular deflection, there was a highly significant reduction, where, the number of cycles was the most influencing factor for reduction of the angular deflection whereas, the concentration of NaOCl and the type of sterilization were show no significant influence on the angular deflection.

أجریت هذه الد ا رسة لتقییم تأثیر عدد م ا رت (دو ا رت) التنظیف باستخدام محلول القاصر بت ا ركیز مختلفة والتعقیم باستخدام جهاز التعقیمبواسطة البخار المحمي و الضغط و فرن الح ا ررة الجاف على خواص الالتواء للأدوات الدوارة المصنوعة من التیتانیوم كوبالت. تماستخدام خمسه أداة دوارة نوع (بروتیبر المتممة) وقد تم تقسیمها إلى ثلاثة مجامیع:- المجموعة الأولى :أدوات لم تعرض لأي من دو ا رت التنظیف والتعقیم وتم تحدیدها كمجموعة سیطرة.- المجموعة الثانیة والثالثة : تم تعریضهما لخمس وعشر دو ا رت ( تنظیف وتعقیم ) بالتعاقب، غم رت بمحلول القاصر بت ا ركیز ٢% و٥% بمحلول القاصر، تم تعقیمها باستخدام جهاز التعقیم بواسطة البخار المحمي و الضغط وفرن الح ا ررة الجاف. كل الأدوات تمتعریضها لأحمال التواء باتجاه عقارب الساعة حتى الكسر وقد تم احتساب قیم عزوم الالتواء والانح ا رف ال ا زوي لكل أداه بعد الكسر.أظهرت نتائج الد ا رسة تأثی ا ر ملحوظا في تقلیل قیم عزوم الالتواء بعد دو ا رت التنظیف والتعقیم بصرف النظر عن تركیز محلول القاصر ونوع التعقیم وعدد م ا رت التنظیف والتعقیم. بخصوص الانح ا رف ال ا زوي كان هناك تأثی ا ر عالیا ملحوظا في تقلیل قیم الانح ا رف ال ا زويللأدوات. حیث أن عدد م ا رت التنظیف والتعقیم كانت عاملا مؤث ا ر بینما كان تركیز محلول القاصر و نوع التعقیم ذو اثر غیر ملحوظ

Keywords

torque --- angular deflection --- Ti-Co


Article
modification of polystyrene co butadiene
تحوير مطاط الى بوليمرات حاوية على مجاميع اميك وايميدات وايسو ايميدات متدلية ترتب البوليمر

Authors: Suaad M. Al-Majidi سعاد محمد حسين الماجدي --- Thanun M.Pyriadi ذنون محمد بيريادي
Journal: Baghdad Science Journal مجلة بغداد للعلوم ISSN: 20788665 24117986 Year: 2006 Volume: 3 Issue: 4 Pages: 656-669
Publisher: Baghdad University جامعة بغداد

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Abstract

During this research accomplish some chemical modifications on the Poly for new modified polymers with Kimaaaúah qualities, physical and unexpected new applications that the first of these chemical modifications that was completed is the introduction of a poly styrene butadiene swash and then this group

تم خلال هذا البحث انجاز بعض التحويرات الكيمائية على بولي للحصول على بوليمرات محورة جديدة ذات صفات كيمييائية وفيزيائية ولها تطبيقات جديدة متوقعة ان اول هذه التحويرات الكيمائية التي انجزت هي ادخال مجموعة على البولي ستايرين بيوتادايين ومن ثم اختال هذه المجموعة


Article
Biocompatibility of Soldering Materials Used for Repair of Cobalt Chromium Joints

Authors: Nadira A Hatim --- Nazar Gh Jameel --- Abdullah J Mohammed
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 21 Pages: 7-13
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The aim of this study is to evaluate the biological activities of three soldering materials used for joining Co-Cr joints (iron, stainless steel, and brass) on the tissue of the Rabbit. Materials and Meth-ods: Nine specimens of each iron, stainless steel, and brass where made as cylinders (3mm x 2.5mm). The middle part was made of the brazing materials and the upper and lower parts were made of Co-Cr. These specimens where implanted in the subcutaneous tissue of the rabbit, after two weeks the animals where sacrificed and biopsies where made and examined under microscope by three oral pathologists. Results: Stainless steel implants were the most biocompatible material among the three materials used as brazing materials. Stainless steel sites had insignificant differences with the control sites. Significant difference was found between the iron implanted sites and the control group. This result found by two viewers (A, and M), while the third viewer (Z) found no significant difference between the control group, and the iron implanted sites. Significant difference was found between the brass implanted sites and the control group, this result was found by the three viewers (A, M, and Z). Conclusions: The stainless steel had the most favorable tissue response among the three soldering materials, iron is in the second rank, and brass showed unfavorable tissue response due to release of Cu.


Article
Spectroscopic study for plasma parameters in co-sputtering system
دراسة طيفية لمعلمات البلازما في منظومة الترذيذ المزدوج

Authors: Kadhim A. Aadim كاظم عبدالواحد عادم --- Rabah A. H. Edan رباح عبدالحميد عيدان
Journal: Iraqi Journal of Physics المجلة العراقية للفيزياء ISSN: 20704003 Year: 2016 Volume: 14 Issue: 31 Pages: 122-128
Publisher: Baghdad University جامعة بغداد

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Abstract

In this work the parameters of plasma (electron temperature Te, electron density ne, electron velocity and ion velocity) have been studied by using the spectrometer that collect the spectrum of plasma. Two cathodes were used (Si:Si) P-type and deposited on glass. In this research argon gas has been used at various values of pressures (0.5, 0.4, 0.3, and 0.2 torr) with constant deposition time 4hrs. The results of electron temperature were (31596.19, 31099.77, 26020.14 and 25372.64) kelvin, and electron density (7.60*1016, 8.16*1016, 6.82*1016 and 7.11*1016) m-3. Optical properties of Si were determined through the optical transmission method using ultraviolet visible spectrophotometer with in the range(300 – 1100) nm.

تم دراسة معلمات البلازما (درجة حرارة الالكترون, الكثافة العددية للالكترونات, سرعة الالكترونات, سرعة الايونات) بإستخدام جهاز الطيف الذي يجمع طيف البلازما. حيث استخدم الكاثود المزدوج (سيليكون – سيليكون) من نوع P-Type وتم ترسيبه على زجاجة. تم استخدام غاز الاركون في ضغوط مختلفة (,0.4 ,0.50.3 و 0.2) تور, بثبوت زمن الترسيب لمدة 4 ساعات. حيث اظهرت نتائج درجة حرارة الالكترون 26020.14 ,31099.77 ,31596.19)و25372.64) كلفن,ونتائج الكثافة العددية للالكترونات و 7.11*1016) m-3و (7.60*1016, 8.16*1016, 6.82*1016كذلك تم ايجاد الخصائص البصرية للسيليكون بطريقة طيف النفوذية البصرية وذلك بإستخدام جهاز الطيف البصري (فوق البنفسجي / المرئي) للاطوال الموجية (1100-300) نانو متر.


Article
Streams and plasma parameters experimental studies in He-CO gas mixtures
دراسة تجريبية للقنوات الكهربائية و معلمات البلازما لخليط He-CO

Author: Hamid K. Radam حامد كريم ردام
Journal: Iraqi Journal of Physics المجلة العراقية للفيزياء ISSN: 20704003 Year: 2010 Volume: 8 Issue: 12 Pages: 1-7
Publisher: Baghdad University جامعة بغداد

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Abstract

DC glow discharges were generated between a thin cylindrical anode and a flat cathode, streamers are thought to propagate by photo-ionization; the parameters of photo-ionization depend on the He: CO ratio. Therefore we study streamers in He ( 90%, 80% and 70% ) with (10%, 20% and 30%) CO respectively. The streamer diameter is essentially the change by increase for similar voltage and pressure in all He-CO mixtures.

التفريغ المضيء يتولد بين الأنود الأسطواني و الكاثود المستوي، حيث تتولد القنوات الكهربائية بواسطة التأين-الضوئي ؛المعلمات للتأين-المضيء يعتمد على نسب الهيليوم و أول اوكسيد الكاربون. لذلك درسنا القنوات الكهربائية للهيليوم بنسب(90%،80%،70%)مع أول أوكسيد الكاربون بنسب (10%،20%،30%) على التوالي). وجد ان قطرالقنوات الكهربائية يزداد عند زيادة الفولتية المسلطة ونقصان الظغط و لجميع النسب.


Article
The Effect of Laser Welding on the Ten-sile Strength and Radiographic Analysis of Co-Cr Repaired Joints

Authors: Abdullah J Mohammed --- Nazar Gh Jameel --- Nadira A Hatim
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 19 Pages: 1-13
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate the effect of laser welding and arc welding on the ultimate tensile strength, radio-graphic appearance of the joints, and microscopic porosities in the fractographs. Four joining methods have been used, laser welding, and arc welding using three types of electrodes (iron, stainless steel, and brass). Effect of surface roughness on the aforementioned properties was evaluated. Materials and Methods: Three specimens as-cast control group, seventy two specimens were treated by polishing, laser, and sandblasting, and joined with the four joining methods. Joints examined by radiograph and porosities were measured by Dimax software program, their ultimate tensile strength, and strain was tested, and the microscopic porosities in the fractographs were measured using AutoCAD software program. Three cobalt chromium bars from the third group were joined to three stainless steel bars from the fourth group of the same diameter to test the ultimate tensile strength, and strain of the dissi-milar alloys. Results: Laser welded and brass soldered joints had significantly lower ultimate tensile strength and strain when compared to the control group, while the iron, and stainless steel soldered joints had insignificant differences in the ultimate tensile strength and strain when compared to the control group. Results shown that the iron and stainless steel soldered samples fractured in the heat affected zone while the brass soldered and laser welded samples fractured in the weld zone. The iron and stainless steel soldered joints had superior mechanical properties when compared with the control group. Laser welding of dissimilar alloys had the lowest mechanical properties among all techniques. Conclusions: revealed that laser welding was the most precise technique used in the current study. Weld fractures shown less tensile strength average and more brittle behavior. Radiographic properties had no influence on the mechanical properties of the joints.


Article
Prevalence of Hymenolepis nana Infections in Abu-Ghraib City /Baghdad/Iraq

Author: Huda Thaher AL- Marsome
Journal: Iraqi Academic Scientific Journal المجلة العراقية للاختصاصات الطبية ISSN: 16088360 Year: 2012 Volume: 11 Issue: 4 Pages: 581-584
Publisher: The Iraqi Borad for Medical Specialization المجلس العراقي للاختصاصات الطبية

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Abstract

ABSTRACT:BACKGROUND: Intestinal parasitic infestation represents a considerable medical and public health problem in the developing countries and up to 10% of the population of the developing world is infected with intestinal worms(1). OBJECTIVE: This study was initiated to investigate the prevalence of H. nana infection in rural environments in Baghdad and to determine if the prevalence could be linked to the availability of water and sanitation facilities. MATERIAL AND METHODS: This study included 300 patients in the Abu-Ghraib province. Stool smear were prepared for each sample stool culture for Shigella spp. . Hemoglobin estimation was evaluated by Cyanmethemoglobin method. RESULTS: From 300 patients only 20 ( 6.67 %) were positive for H.nana ,the male to female ratio was 14:6 , heamoglubulin range from 10.5 -13 g/dl.The age group 1–5 years had the highest rate (50%) ,While the age group more than 20 years were the lowest (5 %); boys have a higher rate (70%) than girls. Other parasitic species found in fecal sample of these patients in association with H.nana infection were Giardia lambli(10%), Entamoeba histolytica(5%) while (5%) of patients were infecting with both Giardia lambli and Entamoeba histolytica, some of these patients (15%) in microscopic examination revealed PMN cell and the stool culture of them were positive for Shigella species. CONCLUSION: Our data suggested that ,the prevalence of H.nana infection was 6.67% in Abu -Ghraib city and diagnosis and treatment of patients are the clue in eradication of H.nana


Article
THE EFFECTIVENESS OF SYSTEMIC CO-ENZYME Q10 IN VITILIGO

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Abstract

Background:Vitiligo is the most frequent depigmentation disorder of the skin. None of the therapeutic alternatives is satisfactory.Objective:To evaluate the effectiveness of systemic Co-enzyme Q10 in patients with vitiligo.Methods:Twelve patients received Co-enzyme Q10 75 mg twice daily compared with 12 patients received placebo capsule twice daily orally for 8 weeks in the Department of Dermatology, Al-Kadhimiya Teaching Hospital (November 2011 to march 2012). History of patients was taken and measurement for serum glutathione (S. GSH) (by Elleman methods), malonialdehyde (S. MDA) (by Stocks and Dormandy methods) and VASI score at baseline, 4 and 8 weeks interval.Results:No significant difference in S. GSH was found between Co-enzyme and placebo group after 4 and 8 weeks. High significant decrease in S. MDA occurred after 4 and 8 weeks with significant decrease in VASI were found after 8 weeks.Conclusion:Co-enzyme Q10 may have a role in treatment of vitiligo.Keywords:Co-enzyme Q 10, Vitiligo, Antioxidant.


Article
Epistaxis :Retrospective study of hospitalized patients
نزيف الانف: دراسة استرجاعية للمرضى الراقدين في المستشفى

Journal: KUFA MEDICAL JOURNAL مجلة الكوفة الطبية ISSN: 1993517X Year: 2013 Volume: 16 Issue: 2 Pages: 1-6
Publisher: University of Kufa جامعة الكوفة

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Abstract

Epistaxis is a common otolaryngological emergency and is often due to lesions within or around the nose or due systemic conditionsAim of the study: To describe the cases of epistaxis that are admitted at our hospital Study design: Retrospective ,descriptive study Place and time: This is a retrospective study described the cases of epistaxis that are admitted to Al Sader Teaching Hospital ,Najaf-Iraq from January 2009 to December 2011.Patients and method: The study evaluated 20 cases of epistaxis that were admitted in Al-Sader Teaching Medical City in Najaf –Iraq from the period of January 2009 to December 2012 . The hospital records of the patients were reviewed and data collected regarding .age ,gender, type of epistaxis , methods of treatments, any associated systemic disease(s) and the time of hospital stay . These variables were collected , tabulated , analyzed and compared with other similar studies,The results: Twenty cases of epistaxis that required admission to Al-Sader Medical city were enrolled in our study. We found that epistaxis has bimodal age of presentation with 8 (40%) patients at age 20-29 year and 8(40%) patients at age of 60- 69year. Male to female ratio was (2.3:1). Anterior epistaxis was more common than posterior epistaxis.15 patients (75 %) had some sort of systemic diseases; the most common was hypertension in 8 (40%) patients. Non surgical method of treatment in the form of nasal packing was performed in all patients. The mean hospital stay was (3.85) days. NO mortality detected in our study.

يعتبر نزيف الانف من اكثر حالات الطوارىء شيوعا في اختصاص امراض الانف والاذن والحنجرة الهدف من هذه الدراسة هو لدراسة حالات النزف الحادة التي تم ادخالها الى المستشفى للتعرف على الطرق المتبعة في علاجها وهي دراسة استرجاعية وصفية واجريت في قسم الانف والاذ ن والحنجرة في مدينة الصدر الطبية /النجف /العراق .اخذت المعلومات من سجلات المرضى الراقدين بسبب النزيف من الانف من الفترة ما بين كانون الثاني 2009 الى كانون الاول 2012، وتضمنت هده المعلومات العمر والجنس ونوع النزيف كونه امامي ام خلفي والطرق التي اتبعت في علاج المرضى وفترة الرقود وكذلك تمت دراسة الامراض العامة لدى المرضى والتي قد تكون مسببة للنزف اوساعدت في زيادة شدته


Article
Simultaneous Determination of Sulphamethoxazole and Trimethoprim in Binary Mixtures and in Tablet Using Derivative Spectrophotometry

Authors: Khaleda H. Al-Saidi --- Marwa S. Yonis
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2015 Volume: 18 Issue: 1 Pages: 46-54
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Derivative spectrophotometric (first, second, third and fourth derivative) were developed for the determination of Sulphamethoxazole)SMX) and trimethoprim (TMP)antibiotic binary mixture by applying zero-crossing technique for pure synthetic mixture while simultaneous determination of (SMX) and (TMP) in tabletsusing D4at waveleanth 257.8 nm and 251.5 nm for (SMX) and (TMP) the correlation coefficient of calibration curves were 0.9992 and 0.9995. Linearity is maintained within a wide concentration range from 2.00 to 25.00 mg/l, with relative error (-0.11 and 0.60) the LOD (0.360 and 0.382 mg/L) and LOQ and (1.200 and1.275 mg/L) respectively.No interference found between both determined and those of matrices. A good accuracy and precision of simultaneous determination of (SMX), and (TMP) were confirmed by statistical analysis.The percentage recovery of the individual drugs under the established conditions is ranged from 97.23% to 102.13 %. This method was compared with the British pharmacopoeiamethodusing F test. The procedures do not require any separation step.

في هذا البحث تم تقدير هذه المركبات أنيا باستخدام المشتقات الطيفية للأدوية (الاولى والثانية والثالثة والرابعة). على شكل أمزجة ثنائية للأدوية بواسطة تطبيق التقاطع الصفري.تم تعيين السلفاميثاكسازول والترايميثوبريم انيا في الادوية باستخدام المشتقة الرابعة في (257.8nm) و 251.5nm)) للسلفاميثاكسازول و الترايميثوبريم على التوالي. وكان منحني المعايرة بمعامل ارتباط r لا يقل عن (0.9992 و (0.9995 ومدى واسع للتراكيز الخطية (2-25 mg/L) وخطا نسبي (-0.11 و 0.60) وحد الكشف (mg/L0.360 و 0.382) وحد التعيين (mg/L1.200 و 1.275) على التوالي بدون تداخل بين مكونات الادوية. النتائج الاحصائية تساند دقة وصحة الطرق المستعملة حيث بلغت نسبة الاسترجاع بين 102.13%-97.23%. هذه الطريقة سهلة لا تحتاج الى فصل أو أي معاملة.

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