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Article
Influence of Aluminum Oxide Conditioning Before Acid Etching on Tooth Surface: an Experimental Study

Author: Arkan Muslim Al Azzawi
Journal: Medical Journal of Babylon مجلة بابل الطبية ISSN: 1812156X 23126760 Year: 2016 Volume: 13 Issue: 1 Pages: 105-109
Publisher: Babylon University جامعة بابل

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Abstract

Aim of the present study, examination of enamel roughness in palatal aspect of extracted premolars by using aluminum oxide (25%, 27% and 28% µm and phosphoric acid 37%. Twenty of all samples contoured with cylindrical shape forming wax and poured with stone to form cylindrical shape and palatal surface remain fully visible and this surface cleaned and polished with plastic cup and pumice and rinsed with distal water and dried with air. Data divided to 4 group each one is 5 extracted teeth and variable assessed by picture captured before and after adding conditioning material by using camera, light microscope,analyzed by Autocad 3D max and electronic microscope with its three dimensional software. The result of this article clearly there is significant difference between groups with different conditioning materials also the pattern of enamel surface showing highly significant difference. This study approved that the palatal animal conditioned with aluminum oxide particles of 25%, 27%, and 28% µm before conditioned by acid etch result in greater scratched and introduce more regular pattern than that using of phosphoric acid only.


Article
Traumatic Dental Injuries Among 6 – 13 – Year - Old - School Children in Tikrit City

Author: Dr. Azhar Ammash Hussien B.D.S., H. D. D., M.SC. د.ازهار عماش
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2016 Volume: 13 Issue: 1 Pages: 46-51
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Background: An injury to both primary and permanent teeth and the supportingstructures is one of the most common dental problems seen in children. The extentof injury may vary from mild chipping of enamel to sever maxillofacial injury.The aim of this study was to find out the prevalence of traumatized anterior teethamong primary school children.Materials and methods: This study is a cross-sectional survey was carried outthrough clinical examination of anterior teeth among 720, 6-13 year old childrenenrolled in primary public schools of tikrit city. The prevalence of traumatizedanterior teeth was studied in relation to age, gender, type of injury in addition tothe cause of fracture. Recording and diagnosis of dental fracture were assessedaccording to Garcia-Godoy classification.Results: Males were more affected than females with odds ratio was 2.53 andstatistically was significant. The higher prevalence of dental trauma was recordedamong the age 10-11 year old. The permanent maxillary central incisors were themost frequent injured tooth and the most frequent type of fracture was the Class IIEnamel-Dentine, fracture without pulp exposure. Fall and playing were the mostfrequent causes of dental injury.Conclusion: data of the present study clearly show the need for dental healtheducation of children and their parents, so prevention programs are needed toimprove the dental health of Iraqi children.


Article
The Effect of Multi-Wall Carbon Nanotubes on the Microhardness of the Tooth Enamel

Authors: Mohammed K. Jawad محمد جواد --- Abbas F. Ali عباس فاضل علي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 1 Pages: 169-173
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The objectives of this study are to evaluate the effect of addition of Multi-Wall Carbon Nano Tubes(MWCNTs) of different concentrations (0.05 mg.mL-1,0.25 mg.mL-1,0.5 mg.mL-1and1 mg.mL-1) on dimethyl sulphoxideDMSO and distilled water (DW) on tooth enamel. It intends to evaluate enamel microhardness in (Kg. m-2) pre andpost the application of Multi-Wall Carbon Nano Tubes (MWCNTs).Materials and Methods: Thirty specimens prepared for the present study to measure the hardness of the enamel.Results: The results showed that a significant increase in the enamel microhardness for groups 0.05 mg/mL (group B),0.25 mg/mL (group C), 0.5 mg/mL (group D) and 1 mg/mL (group E) compared with control group (group A) indimethyl sulphoxide media. Also, the results showed a significant increase in the enamel microhardness for polishedsamples compared with unpolished samples in DMSO media.Conclusion: The final conclusion highest mean value obtained was 1 mg/mL (group E) in the enamel microhardnesssuspension in and dimethyl sulphoxide media.


Article
Assessment of Enamel Surface after Debonding of Different Types of Esthetic Brackets (An In Vitro Study)

Authors: Ghaith M. Hasan غيث حسن --- Dhiaa J. N. Al-Dabagh ضياء جعفر الدباغ
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 4 Pages: 162-167
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Debonding orthodontic brackets and removal of residual bonding material from the enamel surface include critical steps that may cause enamel damage. The aim of the present study was to evaluate and compare the site of bond failure and enamel surface damage after debonding of three types of esthetic brackets (composite, ceramic, sapphire) bonded with light cure composite and resin-modified glass ionomer adhesive.Materials and methods: Seventy two maxillary premolars teeth were divided into three groups each group consisted of 24 teeth according to the type of brackets. Each group was subdivided into two subgroups (12 teeth for each) according to the bonding material that was used. After 7 days of bonding procedure, the brackets were debonded using specifically designed debonding device in which the brackets were debonded by a debonding pliers to simulate the actual clinical debonding procedure. Instron Universal testing was used to apply the debonding force on the debonding pliers which transferred to the bracket. The teeth and the brackets were examined with a 10X magnifying lens to evaluate the site of failure. After the removal of residual adhesive, stereomicroscope was used to evaluate enamel surface damage.Results: The most common type of bond failure was cohesive failure (Score II) in all esthetic brackets. While enamel cracks (scale I) were found to be the most type of enamel damage. Chi- square showed non-significant differences among different types of esthetic bracket bonded with same type of adhesive and between the same types of brackets (ceramic, sapphire) bonded with the two types of adhesive. On the other hand, there was significant difference between composite brackets subgroups bonded with the two adhesives.Conclusion: The bond failure mostly within the adhesive itself and higher enamel damage was resulted from mechanical debonding of these esthetic brackets.


Article
The Performance of Ceramic Enamels Containing CoO-Additives
أداء طبقة طلاء آلمينا السيراميكي بإضافات نسب من أوكسيد الكوبالت (CoO)

Authors: Sabah Abdual – Noor صباح عبد النور --- Ibtihal – Alnamie ابتهال النعيمي --- Ghazi K. Saeed غازي كمال سعيد
Journal: Diyala Journal For Pure Science مجلة ديالى للعلوم الصرفة ISSN: 83732222 25189255 Year: 2016 Volume: 12 Issue: 3 - part 2 Pages: 20-32
Publisher: Diyala University جامعة ديالى

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Abstract

Ceramic coatings (enamels) are normally to protect and isolate metallic surfaces against aggressive environments. In the present work, a set of low alloy steel plates are coated with a special ceramic – glass layer. The stability of which is investigate in terms of its nature adhesion, and the nature of the protected metal surface. These are considered to control the final performance of the laminated composite. Factors which are investigated are those related to the mechanical integrity of ceramic coat, like the porosity, hardness, glossiness, and thermal resistance. And those related to the state of bonding between the metal surface and the protective coating like adhesion index, coat thickness, and the percentage of carbon present in the low alloy steel surface. Moreover, the corrosion behavior of the coated metal surface was studied to investigate the performance of this protective barrier. During this work some measures were taken in an attempt to modify and develop this protective barrier by adding of various amounts of CoO to the basic ceramic mix of coat.It is notice that the overall coat thickness would progressively reduce stability and encourage the pore formation. However the addition of CoO to a certain limit of concentration has progressively enhanced the adhesion with metal surface, the glossiness of the ceramic barrier, its thermal resistance.

يستخدم طلاء السيراميك (آلمينا) عادة لحماية وعزل سطح المعدن ضد أوساط التآكل. وفي هذا البحث تم اختيار مجموعة من صفائح الحديد قليل الكربون (law alloy steel) وطلائها بطبقات من الزجاج سيراميك ، والتحقق من-إستقرارية الالتصاق الطبيعي وطبيعة حماية سطح المعدن من خلال السيطرة على المنتج النهائي للمركبات الصفائحية (طبقات الطلاء) . تم دراسة العوامل التي تحقق السلامة الميكانيكية لخواص الطلاء السيراميكي مثل المسامية ، الصلادة ، اللمعان والمقاومة الحرارية. وهذه العوامل لها علاقة بحالة التلاصق بين سطح المعدن وطبقة الطلاء من خلال مؤشر التلاصق (adhesion index)، سمك الطلاء ، ونسب الكربون في سطح المعدن. علاوة على ذلك تم دراسة تصرف التآكل للتحقق من إمكانية صمود طبقة الطلاء. وفي هذه الدراسة تم إجراء بعض القياسات لأجل تطوير إمكانية الحماية من خلالإضافة نسب مختلفة من أوكسيد الكوبالت (CoO).وجد أن ازدياد سمك طبقة الطلاء يقلل من استقرارية الالتصاق ويشجع في تكوين الفقاعات. في حين لغاية نسب معينة من أوكسيد الكوبالت يزيد من التصاق طبقة الطلاء بالمعدن ، واللمعان ، ومقاومة التآكل والمقاومة الحرارية.


Article
Enamel surface damage after Use of self-etched Flowable composite and conventional orthodontic bonding systems "An in vitro study"
ضرر سطح المينا بعد استعمال الرابط المائع ذاتي اللصق وأنظمة الربط لتقويم الأسنان التقليدية "دراسة في المختبر

Author: Rawof R. Al-Tuma رؤوف رشيد جواد ال طعمة
Journal: karbala journal of pharmaceutical sciences مجلة كربلاء للعلوم الصيدلانية ISSN: 70272221 Year: 2016 Issue: 11 Pages: 116-123
Publisher: Kerbala University جامعة كربلاء

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Abstract

Background: This study aims to evaluate enamel surface damage and the site of bond failure afterusing of two materials with each has different adhesive techniques. One of them is self-etch (7thgeneration bonding system) while the other with three steps conventional technique(5th generationbonding system).Materials and methods: eighty premolars, extracted for orthodontic purposes, were divided into 4groups of 20. The enamel surfaces were examined with 10X magnifying lens. Two types ofbracket (stainless steel and ceramic) was bonded and debonded in each group using ligature wirecutter. The three steps adhesives was conventional orthodontic bracket adhesive of Oromcocompany, the self-etch flowable adhesive was Vertise flow flowable composite of Kerr company;After debonding, the enamel surfaces were inspected under a stereomicroscope to determine thepredominant site of bond failure and adhesive remnant index. Then stereomicroscope was used toevaluate enamel surface damage after the removal of residual adhesive.Results: The reduction in enamel surface damage showed a statistically non-significant with theuse of self-etched flowable adhesive in both ceramic and stainless steel brackets groups. Theamount of the adhesive remained on the tooth surface significantly increase for groups thatbonded with self-etched flowable adhesive in both stainless steel and ceramic brackets. Thepredominant failure site in self-etch flowable adhesive was between enamel and bracket for bothtypes of brackets.Conclusion: The enamel surface damage that results from debonding of conventional orthodonticadhesives was non significantly higher than that found with self-etch flowable adhesive for bothmetal and ceramic brackets "used in this study"

تهدف هذه الدراسة إلى تقييم أضرار المينا السطحية وموقع من فشل السندات بعد استخدام اثنين من المواد مع بعضها لديهاتقنيات لاصقة مختلفة .واحد منهم هو اللصق الذاتي نظام الربط جيل في حين أن الآخر مع ثلاث خطوات (تقنية التقليدية )10 عدسة X ثمانون سن ضاحك مقلوعة لأغراض تقويم الأسنان، تم تقسيمهم إلى 4مجموعات . تم فحص السطوح المينا معمكبرة . مع استخدام نوعين من سنادات التقويم (الفولاذ المقاوم للصدأ والسيراميك) . اللواصق المستخدمة كانت اللاصق التقليديبعد رفع الروابط، تم تفتيش السطوح المينا باستخدام المجهر ؛Kerr والاصق الذاتي المائع لشركة ،Ormco لتقويم من شركةلتحديد موقع فشل السندات والبقايا اللاصقة ثم تقييم ضرر المينا بعد إزالة اللواصق المتبقية

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