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Biomedical subjects

M Mortazavi

Publications and source records attributed to M Mortazavi.

8 recordsLinked to original sources
PubMed2004

Comparison of zinc oxide and eugenol, and Vitapex for root canal treatment of necrotic primary teeth.

OBJECTIVES: The aims of this study were to evaluate iodoform base materials for root canal treatment of necrotic primary teeth, and to compare them with traditionally used zinc oxide and eugenol (ZOE). SAMPLE AND METHODS: Zinc oxide and eugenol and Vitapex (a premixed calcium hydroxide and iodoform paste) were compared for root canal treatment in 52 necrotic primary teeth in two groups of children with a mean age of 5 years and 8.4 months. All the patients were followed-up clinically and radiographically 3 months and 10-16 months postoperatively. RESULTS: The overall success rates of Vitapex and ZOE were 100% and 78.5%, respectively. Using Fisher's Exact Test, the difference was statistically significant (P < 0.05). CONCLUSION: Both ZOE and Vitapex gave encouraging results. Vitapex, however, can be used more safely whenever there is a doubt about the patient's return for follow-up.

Adolescent↗
PubMed2001

Spatially resolved spin-injection probability for gallium arsenide.

We report a large spin-polarized current injection from a ferromagnetic metal into a nonferromagnetic semiconductor, at a temperature of 100 Kelvin. The modification of the spin-injection process by a nanoscale step edge was observed. On flat gallium arsenide [GaAs(110)] terraces, the injection efficiency was 92%, whereas in a 10-nanometer-wide region around a [111]-oriented step the injection efficiency is reduced by a factor of 6. Alternatively, the spin-relaxation lifetime was reduced by a factor of 12. This reduction is associated with the metallic nature of the step edge. This study advances the realization of using both the charge and spin of the electron in future semiconductor devices.

Journal Article↗
PubMed1978

A semiautomated turbidimetric method for determination of plasma fibrinogen.

A semiautomated turbidimetric technic for determination of the concentration of fibrinogen in plasma was compared with chemical analysis of the fibrin formed by addition of thrombin to plasma. The overall coefficient of correlation between the two methods was 0.98, although the turbidimetric technic was somewhat more accurate in hypofibrinogenemic plasma, and the chemical method, in normal plasma.

Automation↗