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Article
Evaluation of Propolis from Kurdistan region as a new resinous sealer in root canal obturation-part I biocompatibility study

Authors: Dara Hama --- Hussain Al-Huwaizi حسين فيصل الحويزي --- Salim El-Samarri سالم السامرائي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 3 Pages: 8-13
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Many materials were proposed as root canal obturating materials but the biocompatibility issueremains to be a critical one. Propolis has been used as a therapeutic agent since the time of Hippocrates. It is knownthat propolis exhibits some pharmacological activities, such as antibacterial, antiviral, antifungal and antiinflammatory activity.Materials and methods: Eighteen albino rats were used in the study and divided randomly into three groups of 6animals for each group. Each group was scheduled to be sacrificed at different time periods, which were threedays, one week and three weeks. Propolis and ZOE sealer implants of 4mm in diameter and 0.5 gm in weight wereimplanted in the dorsal side of the rats. At the end of the implantation, the rats were scarified and thehistopathological picture was made to the implantation site.Results: Zinc oxide eugenol sealer showed severe inflammation after 3 days of implantation whci subsided after 7days. After 21 days, moderate inflammatory reaction was evident. Propolis presented moderate reaction after 3 and7 days but with presence of signs of collagen fiber formation. After 21 days, connective tissue capsule was present.Conclusion: Propolis presented better biocompatibility than zinc oxide eugenol sealer

Keywords

Propolis --- biocompatibility


Article
EVALUATION OF EFFECTIVENESS OF CHITOSAN HYDROGEL AS HAEMOSTATIC FROM DORSAL NASAL VEINS IN RABBITS

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Abstract

The haemostatic capability, adhesion ability and biocompatibility of chitosan sponges was compared with conventional method as control group. The chitosan sponges were briefly immersed in an aqueous 20% ammonia solution before being applied to a rabbit dorsal nasal vein wound. The total amount of bleeding from the injured veins until hemostasis was similar for both chitosan and control group. The complete hemostasis success rates for both the chitosan and control group were also similar. Under hemostasis, the chitosan sponges strongly adhered to the surface of the rabbit muscles, whereas the control group. Under wet conditions, however, there was no significant difference in the adhesive ability between the two groups. During implantation, the chitosan sponges were much more flexible and resistant to breakage that good. The biocompatibilities in addition, biodegradation rates of the Chitosan sponges were very different after subcutaneous implantation in rabbit.


Article
Assessment of rabbit mandibular bone response to different amalgam implants radiographically

Authors: Nazar Gh Jameel --- Mohammad S Suleiman --- Ragheed M Basheer
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2004 Volume: 4 Issue: 3 Pages: 20-27
Publisher: Mosul University جامعة الموصل

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Abstract

The radiograghical interpretations can give an excellent indication about the biological response of hard tissue like bone to different foreign materials imp-lanted within it. This clinical study was carried out to evaluate radiographically the bone reaction of four different types of Iraqi manufactured amalgam alloys (in addition to Degussa alloys as a positive control) implanted within holes prepared in the mandibular bone of the rabbit, and additional negative control group in which the hole remained empty without any implanted materials was also included. The evaluation was done by careful verification of the presence or absence of the radiolucency at the periphery of the implanted amalgam at three different time intervals, the response varied from radio-lucency to radioopacity depending on the reaction of bone to different implanted amalgam alloys. Accordingly, the biocompatibility of the amalgam alloy was deter-mined depending on the radiographic pic-ture of bone response at the margin of the implanted alloys. The results showed no significant difference in bone response among the different types of alloy used.

Keywords

Amalgam --- bone --- implant --- biocompatibility


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
Synthesis of Fibrous Hydroxyapatite through Sol-Gel Route
تصنيع مادة الهيدروكسي ابتايت الشعيرية باستخدام طريقة السائل الهلامي

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Abstract

The sol-gel route using an agar gel with calcium nitrate and phosphate solution as starting materials for producing hydroxyapatite (HAP). The product formed were needle like, zigzag and straight fibres. The fibrous products on sintering transformed into stoichiometric HAP with a biological Ca/P ratio of 1.67. The influences of pH, temperature, nature of base and phosphate solution on the growth of fibrous HAP were studied. The pH of the solution was found to greatly influence the growth rate and morphology of the resultant product. The optimum gel temperature was found to be 60oC and sintering temperature of 900oC for 1 hour. The crystalline, thermal, functional and morphological characteristics of the fibrous HAP were investigated.

أن العمل المعروض في هذا البحث يتضمن طريقة جديدة لتصنيع مادة الهيدروكسي ابتايت (هاب) الشعيرية ذات الاستخدام البايولوجي. محلول نترات الكالسيوم ]المخلوط بنسبة محسوبة لمادة (agar) الهلامية[ وفوسفات الامونيوم تمثلان المواد الرئيسية في التحضير، والتي ينتج عنها مادة (هاب) وبالاشكال (الابري، المتعرج والمستقيم) مع الاخذ بنظر الاعتبار المحافظة على البنية الاساسية لمادة الهاب وبالنسبة المعتمدة بايولوجيا (1.67). لاجل الحصول على تلك المادة وبالمواصفات البايولوجية الدقيقة، يجب السيطرة على المتغيرات الحاكمة وبمنتهى الدقة (الدالة الحامضية، درجة حرارة التفاعل، طبيعة المادة القاعدية وتركيز محلول الفوسفات). الفحوصات الطورية والحرارية والصور المجهرية بينت بان المادة المحضرة مطابقة للمواصفات القياسية.


Article
Effect of Hydroxyapatite Coatings on Corrosion Behavior for Biotype 316L SS Used in Orthopaedic Applications
تاثير الطلاء بمركب الاحيا- سيراميك على سلوك التاكل لسبيكة الفولاذ المستخدمة في حقل جراحة ا لعظام

Author: Abdulsalam Khashan Swadi عبد السلام خشان سوادي
Journal: Baghdad Science Journal مجلة بغداد للعلوم ISSN: 20788665 24117986 Year: 2010 Volume: 7 Issue: 3 Pages: 1237-1243
Publisher: Baghdad University جامعة بغداد

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Abstract

Electrochemical corrosion of hydroxyapatite (HAP) coated performance depends on various parameters like applied potential, time, thickness and sintering temperature. Thus, the optimum parameters required for the development of stable HAP coatings was found by using electrophoretic deposition (EPD) technique. This study discusses the results obtained from open circuit potential-time measurements (OCP-time), potentiodynamic polarisation and immersion tests for all alloy samples done under varying experimental conditions, so that the optimum coating parameters can be established. The ageing studies of the coated samples were carried out by immersing them in Ringer’s solution for a period of 30 days indicates the importance of stable HAP coatings to prevent corrosion on the substrate material, so that enhancement to the biocompatibility will be increased.

العمليات الكهروكيميائية التي تختص بدراسة مقاومة التاكل في مشبهات محاليل الجسم تعتمد على العوامل الحاكمة والمؤثرة اثناء عملية الطلاء ( الفولتية المجهزة، سمك طبقة الطلاء ودرجة حرارة التلبيد) . ان طريقة الطلاء بترسيب الدقائق المشحونة العالقة وجدت كافضل تقنية للحصول على طبقة طلاء منتظم ومستقر لمركب الهيدروكسي ابتايت (هاب) على سطح السبيكة. في هذا البحث تمت مناقشة نتائج المتغيرات التي تعتمد عليها دراسات التاكل (قياسات الدائرة المفتوحة مع الوقت، الاستقطاب الديناميكي وعمليات الغمر في مشبهات محاليل الجسم) لجميع العينات المطلية بمادة هاب وكذلك غير المطلية لاجل المقارنة بينهما. لقد اظهرت نتائج غمر النماذج المطلية لمدة 30 يوم في المحلول المحضر و من خلال دراسة صور المايكروسكوب عدم حصول تاكل لتلك العينات وهذا يفسر اهمية الطلاء بمادة هاب لكونها تمنع حصول عملية التاكل اضافة الى التوافقية البايولوجية التي تمتاز بها.


Article
Influence of Immersion Period on the Corrosion Behavior of Heat Treated Biomedical Alloy Ti -5Al - 2.5Fe
تأثير فترة الغمر على سلوك التأكل السبيكة الطبية Ti -5Al - 2.5Fe المعاملة حراريا

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Abstract

Heat treatment by solid solution method in the + phase region was used at 970°C for Ti-5Al-2.5Fe alloy. The specimens cooled under different cooling media [water quenched (WQ), air cooled (AC) and furnace cooled (FC)], and subsequently aged at 550°C for 4 hours. Five specimens from each treatment were immersed in simulated body fluid SBF for a period of time (3 months). The dependence of corrosion rate on compositional variation in the phases resulted from various type of cooling rates are discussed based on immersion tests. The EDXA results show the precipitation of phosphate and calcium compounds on the alloy after 3 months of immersion in blood plasma solution forming a bone-like apatite, which enhanced the alloy biocompatibility making it more suitable to use as biomedical implant.

تم استخدام السبيكة (Ti-5Al-2.5Fe) المعاملة حراريا (المحلول الصلب) والمدرفلة في طور(+) وبدرجة 970 م °وبثلاث أوساط للتبريد هي (الماء ، الهواء وداخل الفرن) ثم اجريت عملية التعتيق لمدة أربع ساعات للنماذج التي بردت بالماء والهواء وبدرجة550 م °.تم غمر خمسة نماذج من كل معاملة حرارية تم غمرها في مشبهات محاليل الجسم لمدة 3 أشهر. الدراسة اوضحت تاثير نوع التبريد للمعاملة الحرارية على سلوك التاكل للنماذج المغمورة في محول بلازما الدم. أظهرت فحوصات EDXRF ترسب الكالسيوم والفوسفور على السبيكة مكوناً طبقة شبيهة بالعظم مما يساعد في زيادة ملائمتها البايولوجية للاستخدامات الطبية.


Article
Variables Affecting Developments of Hydroxyapatite Coating by Using Electrophoretic Deposition Technique
العوامل المؤثرة على تطوير اساليب الطلاء بمادة الهيدروكسي ابتايت باستخدام تقنية الطلاء بهجرة الدقائق العالقة المشحونة

Author: Abdulsalam Khashan Swadi عبدالسلام خشان سوادي
Journal: Baghdad Science Journal مجلة بغداد للعلوم ISSN: 20788665 24117986 Year: 2008 Volume: 5 Issue: 3 Pages: 423-426
Publisher: Baghdad University جامعة بغداد

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Abstract

Electrophoretic Deposition (EPD) process offers various advantages like the fabrication of the ceramic coatings and bodies with dense packing, good sinterability and homogenous microstructure. The variables namely (applied potential, deposition time and sintering temperature) affected the development of hydroxyapatite (HAP) coatings. The coating weight and thickness were found to increase with the increase in applied potential or coating time. Sintering temperature was found to affect in change phases of the metal, furthermore the firing shrinkage of the HAP coating on a constraining metal substrate leads to serve cracking. XRD Characterization indicates the formation of a contamination free phase pure, and the optical micrographs show the relatively uniform distribution of the HAP coatings. Analysis of the stiochiometric HAP before EPD process and after sintering indicates that the structural aspects do not change i.e. the EPD in ethanol does not affect the structure of HAP powder.

تتميز تقنية الطلاء بهجرة الدقائق العالقة المشحونة بفوائد متعددة خصوصا في عمليات طلاء المواد السيراميكية والسبائك المعدنية المستخدمة في الحقول البايولوجية حيث تجب السيطرة الدقيقة على عدد من المتغيرات الحاكمة (الفولتية المجهزة – وقت الترسيب- درجة حرارة التلبيد) التي لها دور مهم في الحصول على شكل وسمك منتظمين لمادة الطلاء على سطح السبيكة.لقد وجد من التجارب العملية ان زيادة وزن وسمك مادة الطلاء تتناسب مع زيادة الفولتية المجهزة ووقت الطلاء. اختيار درجة حرارة التلبيد تعتبر عاملا مهما في عملية التصاق مادة الهاب على سطح السبيكة وقوة الربط بينهما ولكن درجة التلبيد الحرارية العالية تتسبب في حصول التشققات والتكسرات لمادة الهاب على سطح السبيكة بالاضافة الى انها تسبب تغير في الاطوار الداخلية للسبيكة وتتسبب في تحلل مادة الهاب وتغير خواصها.اجريت الفحوصات الطورية لبيان نقاوة مادة الطلاء وخلوها من الاطوار الاخرى غير المرغوب بها، وقد بينت الصور المجهرية بوضوح تجانس وانتظام طبقة الطلاء، وكذلك بينت الدراسة عدم تاثر مكونات الهاب نتيجة التلبيد بدرجات الحرارة العالية قبل وبعد اجراء عملية الطلاء.


Article
Influence of Fluoride Addition on Hydroxyapatite Prepared for Medical Applications
تأثير اضافة الفلوريد على مركب الهيدروكسي ابتايت المحضر للتطبيقات الطبية

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Abstract

In this study, hydroxyapatite (HAP, Ca10(PO4)6(OH)2) has been prepared as bioceramic material with biological specifications useful to used for orthopedic and dental implant applications. Wet chemical processing seems to form the fine grain size and uniform characteristic nanocrystalline materials by the interstice factors controlling which affected the grain size and crystallinity in order to give good mechanical and/or constituent properties similar as natural bone. Fluorinated hydroxyapatite [4-6 wt% F, (FHA, Ca10(PO4)6(OH)2–Fx] was developed in new method for its posses to increased strength and to give higher corrosion resistance in biofluids than pure HAP moreover reduces the risk of dental caries. The phase's and functional groups characterizations XRD & FTIR reveled the purity of the product and its free of other phases, while the morphology tests showed the compound homogeneity as fluoride interpenetrated in the compound lattice net.

في هذا البحث ، تم تحضير مركب الهيدروكسي ابتايت (HAP, Ca10(PO4)6(OH)2) كمركب سيراميكي وفق المواصفات القياسية المعتمدة بايولوجيا ليتلائم مع الاستخدامات الطبية لجراحة العظام والاسنان. الطريقة الكيمياوية الرطبة استخدمت في تحضير المركب بالسيطرة الدقيقة على كل المتغيرات الحاكمة التي تؤثر على بلورية وحجم الدقائق لكونها تؤثر في جعل المركب ذو مواصفات ميكانيكية وتركيبية مشابهة لمادة العظم الطبيعية . البحث يتضمن استنباط طريقة جديدة باضافة نسبة محددة من مادة الفلور ( 4-6%) ، حيث تؤدي هذه الاضافة الى زيادة صلادة المركب مع مقاومة عالية للتاكل بالاضافة الى فائدتها البايلوجية كونها مادة مفيدة لمنع تسوس الاسنان . لفحوصات الطورية XRD وفحوصات FTIR اظهرت نقاوة المنتج وخلوه من الاطوار الاخرى بينما اظهرت صور التراكيب المجهرية تجانس المركب بتداخل الفلور بالشبكة البلورية للمركب .


Article
X-ray diffraction and biocompatibility of glass ionomer cement reinforced by different ratios of synthetic hydroxyapatite

Authors: Mohammed R. Al.Jabouri --- Zainab M. Abdul-Ameer
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 3 Pages: 62-68
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: This study was done to assist X-ray diffraction and biocompatability of glass ionomer cement reinforcedby different ratios of Hydroxyapatite.Materials and Methods: The powder of glass ionomer cement reinforced by different ratios of Hydroxyapatite wereused to get X-ray diffraction pattern by X-ray diffraction machine, While for biocompatibility test, A polyethylenetubes containing glass ionomer cement reinforced by different ratios of Hydroxyapatite were implanted on thedorsal submucosal site of Rabbit's tissues and histological slide were prepared for histopathological study.Results: X-ray diffraction test showed that all elements of glass ionomer cement reinforced by different ratios ofHydroxyapatite were react with each other and all the final products none crystalline in nature with small amount ofHydroxyapatite present unreacted may be act as cores for final reacted elements. The histological test showed mildirritation to Rabbit's tissues by glass ionomer cement reinforced by different ratios of Hydroxyapatite, this irritationsubsided with time.Conclusions: there is chemical reaction of all elements of glass ionomer cement reinforced by different ratios ofHydroxyapatite and new final products were results .Also glass ionomer cements reinforced by different ratios ofHydroxyapatite were biocompatible with Rabbit’s tissues

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