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Article
Handpiece asepsis among dental practitioners in Mosul City

Authors: Talal H Al–Salman --- Nawfal A Zakaria --- Moataz Gh Al–Shaekh Ali
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2006 Volume: 6 Issue: 7 Pages: 6-11
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To investigate the incidence of handpiece asepsis in general dental practice in Mosul City and toevaluate the problems associated with routine handpiece sterilization which are commonly needed bythose practitioners. Materials and Methods: A questionnaire was designed to collect the informationabout handpiece asepsis techniques performed by dentists. One hundred twenty dentists in Mosul Citywere randomly selected and the data were analyzed. Results: About 55.8% of the respondents knowabout the importance of handpiece sterilization, but no one do ideal sterilization between each patientdue to absence of sufficient number of handpiece and lack of autoclave system in clinics. No onedisinfect the handpiece scientifically; 59.38% smear the handpiece between each patient by one of theantiseptic solutions. Conclusion: Handpiece asepsis in Mosul dental clinics is poor. Most of dentistsdepend on disinfection by disinfectant solution to prevent cross infection by handpieces. Most dentists,because of their poor equipment in both private and national clinics, cannot sterilize handpieces aftereach patient.


Article
Denture Disinfection by Microwave at Different Times and Powers

Authors: Ghada Y. Abdul-Rahman --- Munther N. Kazanji --- Alaa' N. Al-Saraj
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: SpIss Pages: S100-S106
Publisher: Mosul University جامعة الموصل

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Aims: To evaluate the best microwave power and the proper time that disinfect acrylic resin denture base material. Methodology: Fifty five samples were prepared from heat cured acrylic resin(10mmx10mmx2mm) then immersed in glass flask containing brain heart broth and inculated with swabs from patients wearing complete denture divided into: negative control group (untreated), positive control group immersed in 0.02% sodium hypochlorite for 8 hours, and nine groups of different microwave disinfection settings (different powers and times),then immersed in sterile BHI broth individually and diluted up to 10-4 and 0.01ml plated in blood agar and Sabouraud's dextrose agar and CFU/ml were collected. Results: analysis of the data showed a significant difference between tested groups. Conclusions: microwave disinfection at 900W and 540W for 3minutes showed both antifungal and antibacterial effect


Article
Effect of Microwave Disinfection on Transverse Strength and Hardness of Acrylic Resin Denture Base Materials

Authors: Ghada Y Abdul-Rahman --- Munther N Kazanji --- Alaa' N Al-Saraj
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: 18 Pages: 284-291
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate the effect of microwave disinfection on transverse strength and hardness of acrylic resin denture base materials. Materials and methods: The samples were 112 samples (56 heat cured acrylic resin and 56 microwave cured acrylic resin) they were prepared in dimensions of 65± 0.3x10±0.03x2.5 ±0.03 mm (length, width and thickness respectively) for transverse strength test and 30x15x3±0.03 mm (length, width and thickness respectively) for indentation hardness test. The sam-ples were divided into seven disinfection groups; each one contain five samples which were (control, 900 W or 540W for 3min either inside glass flask containing 150 ml of distilled water)or along with glass flask containing 150 ml of distilled water or alone. The collected data were analyzed using analy-sis of variance (one way ANOVA) at P ≤ 0.05 and Duncan's multiple range test. Results: the transverse strength of microwave acrylic resin samples were significantly decreased except samples that disinfect-ed by 540 watt microwave energy for 3 minute with water inside microwave oven. The hardness num-ber for heat cured acrylic denture base showed no significant differences compared to control group while hardness number of microwave acrylic resin were significantly decreased in relation to control group. Conclusions: Transverse strength of microwave acrylic resin that disinfected with microwave was decreased except at 540 watt for 3 minutes with water a side in microwave oven. While heat cured acrylic resin after microwave disinfection was significantly increased compared with the control sam-ple. Rockwell hardness number for microwave acrylic resin significantly decrease in relation to control group; while for heat cured acrylic denture base showed no significancy comparing with the control group.


Article
Evaluation of antibacterial action of photosensitizer solution activated by diode lamp and three intracanal medicaments (in vitro study)

Authors: Mohammed C. Hirais --- Hussain F. Al-Huwaizi حسين فيصل الحويزي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 3 Pages: 43-48
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The elimination of the microorganisms from the root canal systems, an important step for the successfulroot canal treatment. This study was conducted to evaluate the antibacterial effectiveness of the photoactivateddisinfection by using the toluidine blue O and a low- energy light emitting diode (LED) lamp .Materials and method: Sixty single rooted extracted teeth were decoronated, instrumented, irrigated, sealed at theapex and contaminated with endodontic anaerobic bacteria for 7 days to form biofilms in prepared root canals.Group I. Twelve teeth were medicated by photosensitizer (toluidine blue O) solution activated by diode lamp(FotoSan; CMS Dental, Copenhagen, Denmark).Group II. Twelve teeth were medicated by the tricresol formalin.Group III. Twelve teeth were medicated by the camphorated monochlorophenol (CMCP). Group IV. Twelve teethwere medicated by calcium hydroxide (Ca(OH)2) paste. Group V. Without the intracanal medication (controlgroup). The bacterial swabs were taken before and after medication and following the photoactivated disinfectionprocedure immediately and after 7days. The canal contents were swabbed by paper points inserted to the rootcanals, serially diluted and cultured on blood agar. Survival fractions were calculated by counting colony-formingunits.Result: Treatment of the root canals with PAD (fotosan) caused a high significant reduction of the bacterial count,resulting in a 96.39% elimination of root canal bacteria, followed by root canal treated by tricresol formalin (groupII),then CMCP (group III) and Ca(OH)2 (group IV) respectively.Conclusion: Light activated disinfection possesses potent antibacterial action against the anaerobic bacteriacultivated in root canals


Article
Effect of Microwave Disinfection on Hardness of Acrylic Base Denture Lin-ing Material

Author: Marwah M Shehab
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 21 Pages: 128-135
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluated the effect of the repeated microwave disinfection on hardness of vertex denture lining material cured by water bath and microwave. Materials and Methods: Twenty specimens were prepared 4.5 mm thickness × 25 mm in diameter from denture lining material (Vertex , Holland) ad-hered to specimen 2.5 mm thickness × 50 mm in diameter form a heat-cured acrylic resin (Vertex, Holland) and divided into two main groups according to the curing method (waterbath and microwave). The specimens were divided as following, ten specimens, five for each curing method as a control group. The other ten, five specimens for each curing method for microwave disinfection, specimens immersed in 200 ml of distilled water and irradiated with 540 Watt per 3 minute, three times weekly for one month started from the first time of microwave irradiation (microwave disinfection) to twelve times, tested for hardness by using Shore –A- hardness durometer. Results: The independent t-test revealed that, significant differences between control groups (specimens cured by water bath higher than that cured by microwave method), and significant differences between first time of disinfection by domestic microwave oven cured by two methods. The analysis of variance (ANOVA) and Duncan multiple range test confirmed there is a significant difference in hardness of denture lining material in different times of disinfection by domestic microwave oven for both curing methods at significant level (P≤ 0.01). Conclusion: The repeated disinfection by microwave irradiation deteriorated the vertex den-ture lining material regardless to the curing methods.


Article
Effect of Disinfection on Some Properties of Heat-Vulcanized Maxillofacial Silicone Elastomer Reinforced by Nano Silicone Dioxide

Authors: Madiha Fouad مديحة فؤاد --- Mohammed Moudhaffer محمد مظفر
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 4 Pages: 16-21
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The daily cleaning routine of the silicone maxillofacial prostheses by the patient may cause some alteration in the materials properties. The purpose of the present study was to investigate the effect of different disinfection procedures on some properties of silicon dioxide reinforced Cosmesil M511 HTV maxillofacial silicone.Materials and Methods: One hundred and sixty (160) specimens were prepared by mixing 5% SiO2 nano particles and 0.5% intrinsic cream color into the silicone polymer according to manufacturer's instructions. Specimens were divided into 4 groups according to the performed test (tear strength, surface hardness, surface roughness and color) with 40 specimens each. Each group was further subdivided according to the disinfection procedure conducted (control, microwave exposure, neutral soap and 4% chlorhexidine gluconate). Measurements for tear strength were done using universal testing machine. Surface hardness test was carried out with a Shore A Durometer. Surface roughness was analyzed with a portable digital Profilometer. Color change was established with a Spectrophotometer. After the initial testing, all specimens were submitted to disinfection procedure 3 times a week for 60 days. Measurements were repeated and data were statistically analyzed using one-way ANOVA followed by Fisher's LSD or Games-Howell test .Results: Spectrophotometer results showed non-significant decrease in the light absorbance of all experimental groups after disinfection, indicating a strong integration between the nano filler and the polymeric chains, which was not broken during the disinfection procedure. Highly-significant increase in Shore A hardness was recorded, while the decrease in surface roughness was highly significant in all experimental groups. Tear strength reduced significantly after disinfection in all experimental groups.Conclusion: Disinfection seemed to cause different amount of alteration in all of the tested properties of silicone. High color stability is expected in this type of maxillofacial silicone after disinfection.Although microwave exposure had increased the hardness of the material, it is considered a satisfactory disinfection procedure since it caused the least effect on the tear strength and surface roughness of the material. Therefore, microwave exposure is recommended for the disinfection of maxillofacial silicone prostheses


Article
Compressive strength and surface roughness of die stone cast after repeated disinfection with sodium hypochlorite solution

Authors: Sunus Al-Azzawi --- Amer M Khamas عامر خماس --- Jwad Michael جواد مايكل
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2010 Volume: 22 Issue: 3 Pages: 27-33
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The transmission of oral pathogen to impression and subsequently on to gypsum cast has beendemonstrated, and dental stone cast have to be disinfected to prevent the transmission of infectous disease, thisinfection process may affect some physical or mechanical properties of the cast. The aim of the study was toevaluate the compressive strength and surface roughness of type IV dental stone cast after repeated immertion inand sprying using (0.5%) sodium hypochlorite disinfectant solution.Materials and methods: A total of (42test blocks) were prepared and divided to (3) three groups (14each) (controlspray and immersion) for the surface roughness test. These were subdivided into (2) groups (7) each to be testedafter (24 and 48 hours) the same distribution of the test block were followed for the compressive strength test. Foreach test 1/3 of the test black immersed in the disinfectant solution for 30 minutes then allowed 24 hours for be eachdrying this was repeated 5times before being tested, 1/3 of the specimens were sprayed with the disinfectant 5 timesin an interval of 24 hours for bench drying the last 1/3 blokes were the control.Results: Immersing or spraying with hypochlorite solution significantly decreased the compressive strength after 24hours and increased after 48 hours. As for the surface roughness the results showed that both spraying and immersionsignificantly increased the value of the roughness, with immersion as a higher value. Spraying with (0.5%) sodiumhypochlorite solution provide smoother dental stone casts surfaces and adequate compressive strength whenallowed for (48hours) compared to immersion group bench drying.Conclusion: Dental stone casts disinfected by immersion method showed a higher surface roughness than thosedisinfected by spraying.


Article
This study concerns with the incidence of dry sockets among a sample of patients attending different dental clinics after tooth extraction for three consecutive years in relation to their age, sex, tooth location and to patients perceived stress.Dry socket patients records were investigated for age, sex and tooth location. And a control group was chosen of exactly the same age and sex distribution as that of the patients but free from any symptoms . A questionnaire sheet with a list of possible life events for the last twelve months before the extractions were distributed among both, then the results was subjected to statistical analysis.Out of 956 patients, 58 (6%) developed dry sockets, (36%) of them were located on wisdom teeth with the lower ones comprising (25.86%). There were significant difference in mean perceived psychological stress between the patients (477.07 ± 7.38 L.C.U) and those in control group (240.44 ± 7.12 L.C.U.) regarding different ages and sexes.There were higher incidence of dry sockets in this study than most other studies around the world and female /male ratio was nearly equal. They occurred mostly on lower and posterior more than upper and anterior teeth wisdom teeth were most, highly affected, and there were a relationship between psychological stress and dry socket.

Author: Sabah A. Ismail صباح عبد الوهاب اسماعيل
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2013 Volume: 2 Issue: 2 Pages: 169-174
Publisher: Tikrit University جامعة تكريت

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Abstract

The purposes of this study was to investigate the effect of sodium hypochlorite (SH) and chlorhexidine (CH) disinfectant solusions on surface texture and mechanical properties of gutta percha (GP) cones at different concentrations and time intervals. In this study, 190 GP cones size 100 were used. SH solutions at (1%, 2.5%, 5.25%) and CH solutions at (1%, 1.5%, 2%) were used for GP cones disinfection by submerging cones for (10 min, 15 min, 20 min) in each of the solutions to be tested, in which 10 cones were used for each disinfectant solution at every time interval, and 10 cones remain fresh as a control. Surface texture determined by stereomicroscope. Mechanical properties measured by digital universal testing machine. SH solutions at (2.5% and 5.25%) decrease tensile strength, increase modulus of elasticity, decrease percentage of elongation , and left a numerous pitting on GP cones after (10, 15, 20) minutes of disinfection which were significantly different from fresh control cones, 1% SH , and CH at (1%, 1.5%, 2%).Within the limitations of this study, SH at 1% and CH at (1%, 1.5%, 2%) concentrations can be considered the most safe solutions for disinfection of GP cones.


Article
Disinfection Of Alginate And Silicon Impressions By Using UV And Blue Light. (In Vivo Study)

Authors: Mohammad T.AL- Khafagy --- Israa K. AL-Yasiri --- Suhad Jabbar Hamed
Journal: kufa Journal for Nursing sciences مجلة الكوفة لعلوم التمريض ISSN: 22234055 Year: 2013 Volume: 3 Issue: 2 Pages: 184-191
Publisher: University of Kufa جامعة الكوفة

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There is growing concern about the issue of cross-infection in dental clinics and laboratories. There are many methods of disinfection for impression material; but these conventional strategies present several disadvantages .In this study we introduce the UV and blue light as effective savable method for the disinfection of the impression. Aim: The purpose of this study was to evaluate the disinfection potential of UV and blue light on alginate and silicon impression material. Material and methods: Forty college students were randomly selected from Collage of Dentistry in University of Kufa during the period between 1 December 2011 to 1 October 2011. And 40 alginate and silicon impressions were taken and grouped according to time of exposure (10 and 20 minutes). Each impression was cultured on blood agar and Mackonky agar before treatment with UV light or blue light, the treatment was done after 10 and 20 minutes; then cultured for bacterial inspection. The data were analyzed statistically using Chi-square test and P-value 0.05. Result: The culture showed that all the silicone impressions gave a positive result after treatment with blue light and UV light except a group that treated with UV light for 20 minutes, which showed significant reduction in the bacterial growth. All the alginate impressions give positive culture after treatment with UV and blue light after 10 and 20 minutes. Conclusion: From this study, we conclude that the silicon impression can be sterilized with UV light when treated for 20 minutes.

هناك قلق متزايد حول قضية العدوى في عيادات طب الأسنان والمختبرات. هناك العديد من أساليب التطهير لمواد الطبعة , ولكن هذه الاستراتيجيات التقليدية تحتوي عدة عيوب. في هذه الدراسة نقدم ضوء الأشعة فوق البنفسجية والزرقاء كطريقة فعالة وأمينه في تطهير مادة الطبعة.هدف الدراسة : إن الغرض من هذه الدراسة هو تقييم إمكانية تطهير ضوء الأشعة فوق البنفسجية والزرقاء على مادة السيلكون والالجنيت المكونة للطبعة.المواد وطرائق العمل : أربعون طالب كلية تم اختيارهم بشكل عشوائي من كلية طب الأسنان جامعة الكوفة في الفترة من الأول من شهر أيلول إلى الأول من شهر كانون الأول وتم اخذ أربعون طبعة من السليكون والالجنيت وتم تصنيفها وفقا لوقت التعرض (10 و 20 دقيقة). كل طبعة تم زراعتها على وسط أكار الدم ووسط الماكونكي قبل تعريضها لضوء الأشعة الفوق البنفسجية والضوء الأزرق وبعد معاملتها بضوء الأشعة الفوق البنفسجية والضوء الأزرق لمدة 10 و 20 دقيقة. وقد تم تحليل النتائج باستخدام مربع كاي ضمن القيمة المعنوية 0.05 . النتائج: أظهرت نتائج الزرع أن كل طبعات السليكون أعطت نتائج موجبه بعد معاملتها بضوء الأشعة الفوق البنفسجية والضوء الأزرق ماعدا المجموعة التي عرضت للأشعة فوق البنفسجية لمدة 20 دقيقة والتي أظهرت اختزال معنوي في النمو البكتيري.أما بالنسبة لطبعات الالجنيت فأعطت نتيجة موجبه للزرع البكتيري بعد تعرضها لضوء الأشعة الفوق البنفسجية والضوء الأزرق لمدة 10 و 20 دقيقة.الاستنتاجات : من هذه الدراسة نستنتج أن يمكن تعقيم طبعات السيلكون بضوء الأشعة فوق البنفسجية عندما تعامل لمدة 20 دقيقة.


Article
Evaluation the Effect of Different Methods of Disinfection on Tensile Strength and Bond Strength of Soft Denture Lining Ma-terials

Author: Lamia T Rejab
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 21 Pages: 58-65
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: Aim of the study to evaluate the effect of two different disinfection methods for two periods of time on tensile strength and bond strength of soft denture lining materials (Vertex and Molloplast-B). Materials and methods : The effect of two disinfection methods ,first chemical disinfection method (which include artificial saliva , saturated salt and vinegar solution), and second microwave method on two physical properties the tensile and bond strength of soft denture lining materials for two periods of times (14 and 30 days) was evaluated, two hundred samples were prepared, one hundred samples to each property test . ANOVA and Duncan's multiple range test were performed to determine the signifi-cant difference among the tested groups at p ≤ 0.05% . Results: The result showed that the highest val-ue of tensile and bond strength of Vertex after 14 and 30 days were achieved with the microwave group, while for Molloplast -B highest value achieved with the control distilled water group. The low-est value was achieved after immersion in vinegar group for both soft lining material. A significant difference between the two soft lining materials among all disinfection methods at p≤ 0.05.Conclusions : The results appeared that the chemical disinfection and microwave disinfection methods have a significant effect on the tensile strength and bond strength of both vertex and Mol-loplast –B soft ling materials for two periods of time. Microwave disinfection has less effect than the chemical disinfection on the properties. The effect of disinfection increase significantly with increas-ing period of time .

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