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نتائج البحث: 25 من أصل 881

The effect of Different Beam Quality and Quantity With The Use of Short and Long Cone on The Quality of Radiograph

اسم المؤلف: Sohayb Numan Al-Niaimi
الجامعة: جامعة بغداد
اسم المشرف: Adnan Al-Tikriti
الموضوع العام: طب الاسنان
الموضوع الدقيق: اشعة الفم والاسنان
الدرجة: ماجستير
اللغة: الانكليزية
السنة: 1993
مكان الجامعة: بغداد
الصفحات الاولى:

دراسة مقارنة بين الفحص السريري والفحص الشعاعي في قياس تلف العظم السنخي الداني في الاسنان الخلفية

اسم المؤلف: لمياء حامد النقيب
الجامعة: جامعة بغداد
اسم المشرف: Widad F. Al-Sahhar
الموضوع العام: طب الاسنان
الموضوع الدقيق: اشعة الفم والاسنان
الدرجة: ماجستير
اللغة: الانكليزية
السنة: 1993
مكان الجامعة: بغداد
الصفحات الاولى:

تاثير وقت درجة حرارة وتركيز المثبت على تكوين الضباب والتباين في الصورة الشعاعية The Effect of Fixing Time Temperatures and Fixer Concentration on Fog Formation and Contrast of The Radiograph

اسم المؤلف: بان بهنام جرجيس الحسن
الجامعة: جامعة بغداد
اسم المشرف: Widad F. Al-Sahhar
الموضوع العام: طب الاسنان
الموضوع الدقيق: اشعة الفم والاسنان
الدرجة: ماجستير
اللغة: الانكليزية
السنة: 1998
مكان الجامعة: بغداد
الصفحات الاولى:

تطبيق الكلورهكسيدين وبيروكسيد الهيدروجين معا داخل الجيوب اللثوية : نتائج بكتريولوجية وسريرية Application of Combined Chlorhexidine and Hydrogen Peroxide In Periodontal Pockets : Bacteriological and Clinical Outcomes

اسم المؤلف: احمد كريم معيبد
الجامعة: جامعة بغداد
اسم المشرف: باسمة غفوري علي عباس صبري المزرقجي
الموضوع العام: طب الاسنان
الدرجة: ماجستير
اللغة: الانكليزية
السنة: 2020
مكان الجامعة: بغداد
الصفحات الاولى:

حشوات الجذور باستخدام Er,Cr : YSGG ليزر : دراسة سريرية ومجهرية بواسطة مجهر ليزري متحد البؤر Endodontic Therapy Using Er,Cr:YSGG Laser : Clinical and Confocal Laser Microscope Study

اسم المؤلف: علي عباس شهيد
الجامعة: جامعة بغداد
اسم المشرف: حسين علي جواد
الموضوع العام: طب الاسنان
الموضوع الدقيق: طب الاسنان
الدرجة: دكتوراه
اللغة: الانكليزية
السنة: 2020
مكان الجامعة: بغداد
الصفحات الاولى:

تحليل ميكانيكي حيوي للتصحيح التقويمي للانياب البارزة بشكل خاطئ باستخدام طريقة العناصر المحددة Biomechanical Analysis of Orthodontic Correction of Buccally Malposed Canine: A Finite Element Analysis

اسم المؤلف: مثنى ابراهيم علي
الجامعة: جامعة بغداد
اسم المشرف: صلاح رحيمة الزيدي ايمان ابراهيم الشيخلي
الموضوع العام: طب الاسنان
الموضوع الدقيق: تقويم الاسنان
الدرجة: ماجستير
اللغة: الانكليزية
السنة: 2020
مكان الجامعة: بغداد
الصفحات الاولى:

التاثیر البایومیكانیكي للتذریة اللیزریة بواسطة ال (Nd.YAG laser) على الغرسات المصنوعة من التیتانیوم النقي تجاریا : دراسة داخل الجسم Biomechanical Effect of Nd: YAG Laser Ablation on Commercially Pure Titanium Dental Implant (in vivo)

اسم المؤلف: نور جمال محمد سعيد الراوي
الجامعة: جامعة بغداد
اسم المشرف: باسمة محمد علي حسين
الموضوع العام: طب الاسنان
الموضوع الدقيق: صناعة الاسنان
الدرجة: ماجستير
اللغة: الانكليزية
السنة: 2016
مكان الجامعة: بغداد
الصفحات الاولى:

تقييم التوافق الحيوي والخواص الميكانيكية لسيليكون الوجه والفكين معزز بجزيئات نيتريد البورون السداسية Evaluating the Biocompatibility and Mechanical Properties of Maxillofacial Silicone Enhanced by Hexagonal Boron Nitride Particles

المصادر:
اسم المؤلف: منتظر سلام علي
الجامعة: جامعة بغداد
الملخص:
اسم المشرف: فائزة محمد حسين عبد الامير
الموضوع العام: طب الاسنان
الموضوع الدقيق: صناعة الاسنان
الدرجة: ماجستير
اللغة: الانكليزية
السنة: 2024
مكان الجامعة: بغداد
الكلمات الدلالية:
  • Maxillofacial prostheses
  • Maxillofacial silicone
  • Biocompatiblity
  • Mechanical properties
  • Hexagonal boron nitride
المستخلص: Maxillofacial silicone is the most popular material in the fabrication of maxillofacial prostheses. However, the material did not meet the desired qualities of maxillofacial prosthesis due to mechanical properties limitations. This study aims to evaluate maxillofacial silicone’s biocompatibility after the addition of hexagonal boron nitride (H-BN) particles concerning cytotoxicity and skin irritation, as well as its mechanical properties. Methodology: Eighteen specimens of maxillofacial silicone (VST-50F) incorporated with different percentages of H-BN (0, 0.1, 0.3, 0.5, 0.7, and 1 wt%) were tested for cytotoxicity in vitro by direct contact test. Then, cell viability was determined by cytotoxicity assay. Twelve specimens were applied in vivo to the backs of five rabbits for 4 hours, followed by evaluations of the skin irritation. The experimental groups (control, 0.5 wt%, and 0.7 wt%) were selected after the pilot study. 10 specimens out of 120 specimens were utilized to assess each mechanical property (tear strength, tensile strength, elongation percentage, Shore A hardness, and surface roughness). The specimens were studied using field emission-scanning electron microscope (FE-SEM) with energy dispersive X-ray spectroscopy (EDX) and Fourier transform infrared spectroscopy (FTIR). One-way ANOVA and Tukey’s tests were used to assess the data, with P-value < 0.05 indicating statistical significance. Results: The results revealed a negligible effect of the modified maxillofacial silicone to the cell viability after 72 hours of incubation and there was no skin irritation. The FE-SEM and EDX findings showed evenly dispersed H-BN within the VST-50F silicone. The FTIR revealed no chemical interaction between the silicone and H-BN. Both experimental groups showed a significant increase in tear strength and a significant decrease in Shore A hardness and surface roughness. The 0.5 wt% group showed a non-significant drop in tensile strength and elongation percentage. However, the 0.7 wt% group showed a significant decline. Conclusion and recommendations: This study suggests that maxillofacial silicone is safe up to 1 wt% of H-BN in terms of cytotoxicity and skin irritation. As the percentages of H-BN increased, tear strength improved, whereas tensile strength, elongation percentage, Shore A hardness, and surface roughness were reduced. However, the remaining biocompatibility tests need to be investigated before being used on humans.
النص الكامل:
الصفحات الاولى:

المتغيرات الذوقية والشمية لدى اطباء الاسنان المصابين بمرض كوفيد-19 فيما يتعلق بالتغير الجيني ل FUT2 ومستويات الاجسام مضادة في المصل واللعاب Gustatory and olfactory changes among dentists with COVID-19 in relation to FUT2 gene polymorphism, serum and salivary antibody titers

المصادر:
اسم المؤلف: فريال محمود عبد الرضا
الملخص:
اسم المشرف: امينة ريحان دعيجل
الموضوع العام: طب الاسنان
الموضوع الدقيق: طب الاسنان
الدرجة: دكتوراه
اللغة: الانكليزية
السنة: 2024
مكان الجامعة: بغداد
الكلمات الدلالية:
  • covid-19
  • Anti s and anti n specific to corona virus titers
  • gustatory and olfactory loss
المستخلص: Background: Corona virus disease (COVID-19) manifested as acute respiratory distress syn-drome affected millions of people worldwide. Dentists are at increased risk of acquir-ing occupational infections. The infection susceptibility is linked with the both Anti-gen blood grouping system (ABO) and the alpha (1,2) fucosyl transferase (FUT2) se-cretor. Sudden onset of anosmia and/or ageusia symptoms could be enough to isolate patients and vaccinated participants even without doing the COVID-19 test. This study aimed to assess the changes in the chemical sense by one of objective methods the Connecticut Chemosensory Clinical Research Center Test (CCCRC). Assessed post-COVID Immuno-globulin A and G immunity, quantification of salivary biomarkers for prognostication, and immune surveillance. to find any association between specific ABO blood groups and FUT2 secretor status and COVID-19 in a sample of Iraqi den-tists. Methodology: For each 133 participants, a questionnaire including demography, COVID-19 status, blood grouping, Rhesus factor, with chemo sensitive symptoms was recorded using n-butyl alcohol and environmentally realistic odorants and calculated in a modi-fied way for the detection of olfactory function. The gustatory test scoring was done using the four standard primary tastes. A cross-sectional study was done on 91 out of 133 working Iraqi dentists from June to August 2022. The dual IgG and IgA for both spike and Nucleocapsid proteins (s1 & n) specific to COVID-19 were measured by En-zyme linked immunosorbent assay (ELISA)-specific kits from serum and saliva. For randomly selected 36 out of 91 participants Cluster of Differentiation 4 (CD4) and subtypes T helper 1 and T helper 2 were counted by flow cytometry from fresh whole peripheral blood. The DNA was extracted from salivary leukocytes for all study partic-ipants. Molecular detection of the FUT2 gene by real-time Polymerase Chain Reac-tion and the data were sequenced and the phylogenetic tree was drawn for randomly selected 20 participants. Results: participants were more commonly females (81,61%) with the majority were be-low 35 years of age (97,72%). Half of the participants experienced smell and/or taste loss during the COVID-19 infection; whereas (133;99.2%) recorded by CCCRC had olfactory dysfunction and (105,78.2%) had gustatory dysfunction. Males were with a higher significant rate of taste loss (P=0.009) whereas females with a higher recovery rate within the first two weeks after the onset than males. The Pfizer vaccine was sig-nificantly related to smell loss (P=0.038). All cells’ levels were reduced and signifi-cantly associated with a positive COVID-19 infection whereas the CD4 was signifi-cantly related to the Pfizer vaccine, loss of both sense and recovery time within 15 days. A high significant positive correlation was found between CD4 and Th2, IgG n in serum; was highly significantly related with positive COVID-19 infection higher than that of serum IgG s1. Noticeably, the IgA (s+n) in serum was negatively correlated with Th1 and Th2, could be detected in individuals with a duration from last infection >1-2 years and last vaccine duration > 6- 12 months. Blood group O was the most pre-dominant among this study participants (40%), followed by B, A, and AB with (90%) of them were RH+. A significant relationship between smell dysfunction and infected blood group A and RH+ (p =0.044, 0.038) while taste dysfunction was negatively and significantly correlated with AB group (r=-0.73; p=0.008). The FUT2 secretor showed a significant relation with COVID-19 infection and frequency. The majority of COVID-19-infected participants experienced a significant loss of both smell and taste with fast recovery within 2 weeks. Conclusions: The COVID-19 infection susceptibility and reinfection associated with FUT2 secretor status and greatly related to olfactory and gustatory sense loss. Sex variation was noticed with more predominant to females in dysfunction and faster recovery from dysfunction. The blood group A was associated with olfactory dysfunction and more with Pfizer vaccine. The low level of CD4 and an imbalance Th1/Th2 ratio made the recovered individual more susceptible to re-infection but the significantly high percentage of specific COVID antibodies followed one time of infection or booster vaccine dose gave their protection.
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