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Biomedical subjects

M Mesbahi

Publications and source records attributed to M Mesbahi.

4 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↗
PubMed1990

2H-NMR resolution of the methylenic isotopomers of ethanol applied to the study of stereospecific enzyme-catalysed exchange.

We have shown that site-specific natural isotope fractionation of hydrogen studied by NMR (SNIF-NMR) is an important source of information on the mechanistic and environmental effects which govern the photosynthesis of sugars and their fermentation into ethanol. Three isotope ratios associated with the methyl, methylene, and hydroxyl sites of ethanol are determined in achiral media. In this study we show that complementary information about possible stereospecific mechanisms involving the methylenic hydrogens is also rendered accessible by 2H-NMR enantiomeric resolution. The synthesis of mandelate esters enables exchange between the pro-R site of ethanol and water to be investigated. Simultaneous access to the three site-specific isotope ratios of the ethyl group is obtained at isotopic dilutions close to the natural ones. Mediation of the exchange by the enzymic system alcohol dehydrogenase-alpha-lipoyldehydrogenase and by the yeast Saccharomyces cerevisiae are compared. The progress of the reaction can be followed quantitatively as a function of time and the occurrence of glycolytic metabolism of endogeneous materials by yeast can be substantiated in a one-pot experiment.

Alcohol Dehydrogenase↗