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Article
Evaluation of Transverse strength, Impact strength and Hardness of Thermosense denture base material and compare the result with heat cure acrylic denture base material (in vitro study)

Author: Dr. Hadeel Adnan Mohsin, B.D.S., M.Sc. * د. هديل عدنان
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2016 Volume: 13 Issue: 1 Pages: 64-69
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Background: Thermosense material is the innovative virtually unbreakable, newmonomer free rigid denture base material easy and quick to polish and availablein 10 colors, suitable to patients unable to accept denture made from materialsthat could result in allergic reactions or other sensitivity problems. This type issuitable for full and partial denture and can be used for rebase and reline jobs.Also suitable for overdenture on implant and for repair.Material and methods: sixty samples were prepared and divided in to two maingroups according to the type of material that used (thermosense denture basematerial and heat cure acrylic denture base material). Each main group weresubdivided in to three subgroups according to the type of test that has used(Hardness, impact strength, and transverse strength). Data were analyzed by onewayanalysis of t-test.Results: for this study the result for three tests; hardness, transverse strength andimpact strength show high significant difference.conclusion: This study showed Thermosense denture base material had higher impactstrength than Heat cure acrylic denture base material but this material had highertransverse strength and hardness than Thermosense denture base material.


Article
A Survey of Prosthodontics Techniques Applied by Dental Practitioners in Sulaimani City

Author: Neda Al-Kaisy نداء القيسي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 3 Pages: 22-29
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Prosthodontic services have changed markedly due to an introduction of new materials, techniquesand treatment options. The aim of this study were to identify the type of materials and the methods used by dentalpractitioners in their clinics to construct conventional complete dentures and to specify the type and design forremovable partial dentures (RPDs); and to then compare them with those taught in dental schools.Materials and methods: A total of 153 dental practitioners in Sulaimani city completed a written questionnaire. Thequestionnaire included 19 questions regarding complete and RPDs fabrication.Results: Most of the practitioners provide complete dentures (81.6%) and RPDs (95.3%) in their clinics. Polyvinylsiloxane 38.4% and irreversible hydrocolloid 37.6% impression materials were most commonly used to make thepreliminary and zinc oxide eugenol 52% for final impressions. The majority of participants did not disinfect theirimpressions (73.9%). In order to establish the vertical and centric relations, different methods were used. Manypractitioners depend on dental technicians to determine the post-dum area (42.4%) and all of them faced differentproblems during fabrication of the complete denture. Acrylic RPDs were the main type of RPDs provided (89.7%),followed by flexible partial dentures (70.5%). The minority constructed cast metal RPDs (18.4%).Conclusions: Private practitioners did not perform most of the techniques nor use the procedures or materials thatare being taught in dental schools. There is a need for continuing dental education programs for improving theirclinical skills. Moreover reassessing of the prosthodontic curriculum of the related dental schools is required


Article
Push-out bond strength and apical microleakage of (MTA Plus, Biodentine, and Bioceramic) as apical third filling (An in vitro study)

Authors: Dr. Abeer A. Abass B.D.S. د. عبير عباس --- Prof. Dr. Jamal A. Mehdi B.D.S., M.Sc. دز جمال عزيزىمهدي
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2016 Volume: 13 Issue: 1 Pages: 1-10
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Background: This study was conducted to evaluate the sealing ability of (MTA Plus,Biodentine Bioceramic root repair material) as an apical third filling by using(Push-out bond strength test, apical microleakage test).Materials and methods: Sixty straight palatal roots of the maxillary first molars teethwere used in this study, the roots were instrumented by using crown downtechnique with Protaper universal rotary system, the roots were randomly dividedinto three groups according to the materials used for filling apical third(n=20).Group (1): MTA Plus . Group (2): Biodentine. Group (3): Bioceramicrepair material. For all groups complete obturation with easy & quick obturationsystem was used. After incubation period of three days ten roots for each groupwere embedded in clear acrylic resin and each root sectioned in apical to provideslice 2mm in thickness. The bond strength was measured using computerizeduniversal testing machine. Ten roots remain from each group used for apicalmicroleakage study. The roots submerged in 2% methylene blue for three days.The roots were cleared and the degree of linear dye penetration was measured inmillimeter by stereomicroscope under 40 X magnification with calibrated scaleocular grid. The data were analyzed statistically using ANOVA and LSD test.Results: In push-out bond strength showed the Biodentine has the highest meanvalues (19.687) in comparison with other groups followed by MTA Plus groupwhich the mean value was (19.395), while the BC material group has the lowestmean value (10.977). In microleakage the BC material group has the high meanvalues (0.477) of apical dye penetration in comparison with other groups.Biodentine group has lowest mean values (0.359) of apical dye penetration.Conclusions: The Biodentine higher push-out bond strength and less apicalmicroleakage then other test materials.


Article
Use of universal 18SrDNA gene and CHROMagar Candida medium for the identification of Candida species isolated from denture wearers.
استخدام 18S العالمية الريباسي الجينات وCHROMagar المبيضات المتوسطة للتعرف على أنواع المبيضات معزولة عن مرتديها أسنان.

Author: Khulood Abdulkareem Hussein خلود عبد الكريم
Journal: Al-Kufa University Journal for Biology مجلة جامعة الكوفة لعلوم الحياة ISSN: 20738854 23116544 Year: 2016 Issue: Special Second International Scientific Conference for the Life Sciences Pages: 8-13
Publisher: University of Kufa جامعة الكوفة

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Abstract

Candida spp. are considered the most important species able to cause oral infections in denture wearers during the past two decades, from 35 swab samples were isolated from denture wearers showed only 12(34.3%) positive culture result on SDA , PCR products test (genotypic methods) to the universal 18SrDNA fungi gene amplified for these positive culture isolated gave bands at the position 260bp when compared with standard molecular DNA ladder. In this investigation, chromogenic agar test (phenotypic methods) products showed 7(58.3%), Pink, mauve colonies were identified as Candida krusei, 3(25%) blue colonies were identified as Candida tropicalis and 2( 16.7%) light green colonies considered as Candida albicans, and showed [C. krusei, C. tropicalis] were negative to germ tube formation test and C. albicans was positive to germ tube test.

المبيضات النيابة. وتعتبر أهم الأنواع قادرة على أن تسبب التهابات الفم في مرتديها أسنان خلال العقدين الماضيين، من 35 عينة مسحة تم عزل من مرتديها أسنان أظهر فقط 12 (34.3٪) نتيجة ثقافة إيجابية على حزب العمل الديمقراطي، PCR اختبار المنتجات (الأساليب الوراثية) ل في عالمي 18SrDNA الفطريات الجينات تضخيم لهذه الثقافة الإيجابية معزولة أعطى العصابات في 260bp موقف بالمقارنة مع معيار سلم الحمض النووي الجزيئي. في هذا التحقيق، وأظهرت اختبار أجار (طرق المظهرية) منتجات اللونية 7 (58.3٪)، وردي، وقد تم تحديد المستعمرات البنفسجي كما المبيضات krusei، 3 (25٪) تم تحديد المستعمرات الزرقاء كما المبيضة المدارية و2 (16.7٪) مستعمرات الضوء الأخضر تعتبر المبيضات البيض، وأظهر [C. krusei،جيم مداري] كانت سلبية إلى أنبوب اختبار جرثومة تشكيل وكان جيم البيض إيجابية لاختبار أنبوب الجرثومية.


Article
Effect of Mixing Silanized Poly Propylene and Siwak Fibers on Some Physical and Mechanical Properties of Heat Cure Resin Denture Base
تأثير إضافة خليط من ألياف البولي بروبيلين والسواك بعد المعالجة السطحية على بعض الخصائص الفيزيائية و الميكانيكية لقاعدة طقم من الأكريل الحراري

Author: Hanan Abdul-Rahman Khalaf حنان عبد الرحمن خلف
Journal: Al-Mustansiriyah Journal for Pharmaceutical Sciences مجلة المستنصرية للعلوم الصيدلانية ISSN: 18150993 Year: 2016 Volume: 16 Issue: 1 Pages: 26-37
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

PMMA is used in construction of denture base due to several advantages, including biocompatibility and optimal appearance. Operators and patients complain from fracture of acrylic denture base material attributed to decreased resistance to impact, flexural or fatigue stresses. The aim of the research is to assess the effect of addition of silanized mixture of siwak and poly propylene fibers on PMMA denture base.Fourteen acrylic resin specimens were prepared for each test (Impact strength, Transverse strength, Shear bond strength, Thermal conductivity, Shore D hardness, Surface roughness and Water sorption) the specimens were grouped as control group (n=7) :no fibers additive and experimental group (n=7):(2 %) silanized mixture of siwak and poly propylene fibers, 4 mm length, FT-IR was done to investigate the presence of functional groups of coupling agent (TMSPM) on the tested fibers, independent t-test was used for statistical analysis of the resulted data. Statistical analysis indicated that silanized mixture of poly propylene and natural fibers (siwak) produced significant increase (p≤0.05) of impact strength and highly significant increase (p≤0.01) of shear bond strength, transverse strength, thermal conductivity and shore D hardness of heat cure acrylic resin while a non significant increase (p>0.05) of surface roughness and water sorption properties was observed in comparison to non fiber reinforced resin specimens. The addition of silanized mixture of siwak and polypropylene fibers into heat cure PMMA improve the tested physical and mechanical properties.

يستخدم البولي مثيل ميثاكريليت في صناعة قاعدة أطقم الأسنان بسبب العديد من المزايا مثل التوافق الحيوي مع الأنسجة والمنظر الجميل الأمثل ولكن المرضى يعانون من كسر طقم الأكريلك بسبب إنخفاض المقاومة للصدمة وللقوة العرضية.الهدف من هذه الدراسة هو تقييم إضافة خليط من ألياف البولي بروبيلين وألياف السواك الطبيعية المضادة للميكروبات على قاعدة طقم الأكريلك.تم إعداد أربعة عشر من عينات راتنج الأكريلك الحراري لكل من الإختبارات التالية: قوة الصدمة, قوة المستعرضة, التوصيل الحراري, الصلادة السطحية, خشونة السطح, قوة الالتصاق القصي لطقم الأسنان وقابلية إمتصاص الماء. تم تقسيم العينات الى مجموعة السيطرة (7 عينات) والمجموعة التجريبية (7 عينات) التي تحتوي على 2% من خليط الألياف المعالجة سطحيا وبطول 4 ملم وقد تم إجراء فحص FTIRللتحقق من وجود مادة silane على سطح الألياف وتم تحليل النتائج بواسطة إختبار t- test للتحليل الاحصائي للبيانات.أظهرت النتائج زيادة معنوية في قوة الصدمة, قوة المستعرضة, قوة الإلتصاق القصي لقاعدة الطقم, الصلادة والتوصيل الحراري لمادة راتنج الأكريلك الحراري المدعم بالألياف كما أظهرت النتائج إنخفاض غير معنوي في خشونة السطح وخاصية إمتصاص الماء عند المقارنة مع مجموعة السيطرة. نستنتج من هذه الدراسة أن إضافة خليط من ألياف البولي بروبيلين وألياف السواك المعالجة سطحيا يؤدي الى تحسين الخصائص الفيزيائية والميكانيكية لمادة راتنج الأكريلك.

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