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Article
Radiopacity of modified microhybrid composite resin: (An in vitro study)

Authors: Sazan Sh. Saleem سازان سليم --- Salem A. Al-Samarai سالم السامرائي --- Dara H. Saeed دارا سعيد
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: special issue 1 Pages: 18-22
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The aim of this study was to measure the radiopacity (RO) of modified microhybrid composite resins byadding 2 types of nanofillers (Zinc Oxide and Calcium Carbonate) in two concentrations 3% and 5% and comparingthem to unmodified microhybrid composite resins and to nanofilled composite resin.Materials and Methods: Two types of composite resin were used (Microhybrid composite MH Quadrent anterior shineand Nanofilled composite resin Filtek Z350 XT), for each tested group five disk-shaped specimens (1-mm-thick and 15mm diameter) were fabricated. The material samples were radiographed together with the aluminum step wedge.The density of the specimens was determined with a transmission densitometer and was expressed in term ofequivalent thickness of aluminum. Data analyzed by one-way ANOVA.Results: The radiopacity (RO) values of the tested group ranged between (0.9293- 2.6242 Eq. Al thickness) and therewere significant differences among them. Nanofilled composite resin Filtek Z350 XT showed the highest value of ROwhile unmodified Microhybrid composite MH Quadrent anterior shine showed the lowest value of RO.Conclusion: The addition of 3% of both the ZnO and CaCO3 nanofillers fillers to microhybrid composite significantlyincreased the RO, while the addition of 5% of CaCO3 and ZnO nanofillers to microhybrid composite showed nonsignificantincrease in the RO of the composite.


Article
Study the Effect pf Using Intensifying Screen on Magnitude of Changing Calibration Curve For Dental X-Ray Film in Manual evelopment Method

Authors: Hanaa N Akrawy --- Muna Y Shamon --- Qusay KH O Al-Dulamey
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2008 Volume: 8 Issue: 2 Pages: 259-265
Publisher: Mosul University جامعة الموصل

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Abstract

Aim: To study the effect of using intensifying screen (Rare Earth ),with a film which dose not existwith it. Materials and Methods: The patient received the radiation dose during dental fustigation byx-ray radiation. The optical density of the x-ray film was measured using densitometer. Result: Adecrease in radiation dose was approximately 20% for the same condition . 241Am was used, because itsenergy (59.5keV) is close to the energy of x-ray in dental radiography. Conclusions: It is essential touse intensifying screen I.S in the diagnoses field of dentistry for the purpose of reducing the amountof radiation dose. It could be concluded that small calibration operation must be determined during theregular interval periods for the optical density measurements of the optical density by densitometer toshow its efficiency

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