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Article
COMPARISON STUDY OF THE SHEAR BOND STRENGTH BETWEENPOLYETHER AND ADDITION SILICONE IMPRESSIONMATERIALS

Author: Saad F. Oboudi
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2009 Volume: 12 Issue: 3 Pages: 56-63
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Abstract
The impression material is used mainly in the area of removable partial and complete denture
and in the construction of inlays, crowns and bridges. They are used also in dental laboratories for
duplicating master casts.
Recent studies have evaluated the bond strength of selected impression materials. This research
was performed to study the shear bond strength of impression materials to tray by testing forty
samples, each of which consisted of two blocks of acrylic with the impression material sandwiched
between them. Tray adhesive was used to increase adhesion between impression material and
custom tray. Also this research showed that by the use of perforation impression materials adhere
firmly to the impression trays. Therefore perforation - adhesive combination gave acceptable
results.
Experimental results indicated that polyether impression material showed higher shear bond
strength values to cold-cure acrylic than addition silicone impression material for both control and
perforated samples without adhesive application. The shear mean bond strength values of polyether
to the tray material after adhesive application were decreased. While, the shear mean bond strength
increased significantly when addition silicone was used with the adhesive and with the combination
samples.


Article
Formation and Characterization of Co2O3 and Co2O3(1-x):Cux Thin Films
تحضير وتوصيف أغشية Co2O3 و Co2O3:Cuالرقيقه

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Abstract

Co2O3 and Co2O3(1-x):Cux films have been deposited by using spray pyrolysis technique on a glass substrates. The optical properties of the cobalt oxide have been studied as a function of doping concentration with Cu. Changes in direct optical band gap energy of cobalt oxide films were confirmed after doping, Eg increased from 1.48 and 1.95 eV for the undoped Co2O3 to 1.55 and 2.05 eV with increasing the doping concentration to 5%. The effect of doping on the optical parameters of Co2O3 thin films such as transmittance, reflectance, absorption coefficient, refractive index, extinction coefficient, and real and imaginary parts of dielectric constant has been reported.

تم ترسيب أغشية رقيقة من أوكسيد الكوبلت Co2O3 وأوكسيد الكوبلت المشوب بالنحاس Co2O3:Cu على قواعد زجاجية بأستخدام تقنية التحلل الكيميائي الحراري. تم دراسة الخواص البصرية لأغشية Co2O3 كداله لنسب التشويب بCu. تم تأكيد التغييرات الحاصله في فجوة الطاقة البصريه بعد التشويب.حيث أزدادت Eg من 1.48 وeV1.95 لغشاء أوكسيد الكوبلت غير المشوب الى 1.55 وeV2.05 لغشاء أوكسيد الكوبلت المشوب بنسبة 5% من النحاس. تم دراسة تأثير التشويب على المعلمات البصريه لأغشيةCo2O3 الرقيقة مثل: النفاذية، الانعكاسية، معامل الامتصاص, معامل الأنكسار، معامل الخمود، ثابت العزل الحقيقي وثابت العزل الخيالي.

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