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Article
A comparative study between the atomic absorption and spectrophotometric method in the assessment of the corrosion

Author: Suhad.J.Hemed
Journal: journal of kerbala university مجلة جامعة كربلاء ISSN: 18130410 Year: 2011 Volume: 9 Issue: 4 Pages: 21-25
Publisher: Kerbala University جامعة كربلاء

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Abstract

Back ground: Atomic absorption method is the most accurate method in the assessment for the determination of corrosion of dental alloy. The spectrophotometric method with the use of chromogenic complex was used also in the assessment of the corrosion. The aim of this study was to compare between the two methods.Material and Methods: twenty amalgam specimens were used: each was stored in 5 ml of normal saline solution for 1 month. The specimens were randomly grouped into two groups (group A and group B). Then the assessment of the corrosion was done by measuring of the released mercury, for group A is done by the atomic absorption method and for group B by the spectrophotometric method.Result: there is no statistical significant difference between two methods.Conclusion: the spectrophotometric method was successful alternative method to the atomic absorption methods in the assessment of the corrosion.

مقدمة :-تعتبر طريقة الامتصاص الذري الطيفي من أفضل الطرق وأدقها وأكثرها صحة في قياس مدى تآكل المعادن المستخدمة في طب الأسنان . قدمت الطريقة الطيفية مع استخدام مركبات معقدة ملونة وحساسة خاصة ايضا لقياس التاكل حيث انها طريقة اسرع واقل تعقيداَ . يهدف هذا البحث لاجراء مقارنة بين الطريقتين. المواد والطرق: اخذت عشرون عينة من كبسولات حشوات الاملغم ، وضعت بعد تحضيرها في 5مل من السائل الفسيولوجي الطبيعي وحفظت لمدة شهر في حاضنة بدرجة 37 درجة مئوية ، ثم قسمت عشوائيا الى قسمين : قسم أ وقسم ب تم قياس الزئبق المطروح في سائل الحفظ لعينات القسم أ بطريقة الامتصاص الذري اما القسم ب فقد تم القياس بطريقة الطيف مع المعقد الملون.النتيجة: لا فرق بين نتائج الطريقتين.الاستنتاج: طريقة القراءة الطيفية يمكن ان نعتبرها بديلا ناجحا لطريقة الامتصاص الذري في قراءة تآكل المعادن.


Article
Measurement of Mercury Concentration in Saliva of Selected Sample of Children in relation to Amalgam Fillings

Authors: Abdul Wahab T. Shakir عبد الوهاب شاكر --- Ban Ali Salih بان علي صالح
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2011 Volume: 23 Issue: special issue Pages: 134-140
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Dental amalgam fillings interact in a complex way with the environment in the oral cavity as they aresubjected to chemical, biological, mechanical, and thermal forces. These forces change the restoration’sappearance and properties, causing metal ions, amalgam debris, non-metallic corrosion products, and mercuryreleased into the oral cavity. The aims of this study were Measure the concentration of mercury in saliva of children inrelation to the number of amalgam fillings before and after chewing and measure the continuous release of mercuryvapor from amalgam fillings in children and its relation to gender and age.Materials and methods: The sample consists of 51 children between 8-10 years of age and they were divided intothree groups according to the number of amalgam fillings they have in their teeth (1st group children didn't haveamalgam fillings in their teeth, 2nd group children had 1-2 amalgam fillings, 3rd group children had ≥3 amalgamfillings). Then saliva samples were collected from each child before and after chewing of sugar free chewing gum insterilized disposable cups.Results: The results indicated that minute amount of mercury were continuously released from amalgam restorationsand the release is accelerated after stimulation (chewing).Also the results demonstrated a positive correlationbetween the number of amalgam fillings and mercury concentration in saliva, mercury in saliva of children whodidn't have amalgam fillings in their teeth may come from other sources such as air, water and food. There was norelation between mercury concentration in saliva of children and the gender and age of children

Keywords

children --- mercury --- saliva --- amalgam filling


Article
Urinary Mercury concentrations associated chewing gum in students of Faculty of Dentistry

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Abstract

The aim of this study was to measure the urinary mercury concentration instudents after chewing gum for certain period of time. Sixteen students from facultyof dentistry had used chewing gum for five hours a day for seven days. Urine samplecollected 24 h before and after the experimental time. Total mercury in urine (U-Hg)was determined by means of inductively coupled plasma mass spectrometry (ICPMS).t-test was used for the comparison of mercury before and after chewing gum. Anon significant difference was found after chewing than before chewing gum.

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