bacterial flora of carious lesions and caries-free surfaces in school students 13-16 years of age in Cairo

This study showed that the difference between group 3 and either of group 1 or group 2 was statistically significant as regards total bacterial count, total streptococcal count and Strep. mutans count. While, this difference was not significant between group 1 and group 2. It was also found that the difference in the mean percentage of total streptococcal count between the three groups was statistically insignificant at 5% level. As regards Strep. mutans, the difference in the mean percentage between group 1 and group 2 was not statistically significant; while it was significant between group 3 and either of group 1 or group 2 at 5% level

Effect of different fluoride mouthrinses in prevention of dental plaque among 15-year-old children in Cairo

Six hundred students 15-year-old were examined for assessment of plaque index scores. The children were randomly divided into four groups: three test groups using three fluoride mouth rinses [sodium fluoride, amine fluoride and mixture of sodium fluoride and amine fluoride] and one control group using placebo mouth rinse. Rinsing was done once per day for eight weeks. The results showed that all types of fluoride rinses could not completely prevent the development of dental plaque but they decreased the formation with different degrees. It had been also found that both amine fluoride mouth rinse and mixture of [sodium fluoride and amine fluoride] were more effective in prevention of dental plaque than sodium fluoride mouth rinse

Bronchogenic carcinoma: Review of 120 cases

In this study 120 cases of bronchogenic carcinoma are reviewed. All cases were subjected to thorough clinical and laboratory investigations. Of the cases were diagnosed in late stage of the disease due to misinterpretation of symptoms. In 27.5% of cases the diagnosis was made in an inoperable stage. At thoracotomy 37.5% of cases were non-respectable and only biopsy was taken. Resection for palliation was done in 15% and resection for cure was done in only 20% of all cases. simple chest X-ray gave good anatomic diagnosis in most cases. the different methods used to obtain cells or tissues from the tumour for pathological diagnosis were assessed. The commonest histologic type found in this study was squamous cell carcinoma which was strong relation with cigarette smoking. This verifies the relation between smoking and bronchial carcinoma and the value of smoking control in prevention of beonchogenic carcinoma

Changes in systemic vascular resistance and cardiac output during mitral valve replacement

Systemic vascular resistance and cardiac output were measured during mitral valve replacement for twenty patients with relatively good left ventricular function. Measurements taken prior to induction of anaesthesia were considered as control values. The systemic vascular resistance showed significant increase associated with highly significant decrease in cardiac output before the begining of cardiopulmonary bypass. Ten minutes after commencement of bypass there was very high significant decrease of systemic vascular resistance. During bypass the resistance started to increase, but it did not reach the control value at the end of hypass. During sternaI closure and one hour post operatively the systemic vascular resistance was still below the control value but associated with significant increase in cardiac output. There was highly significant negative correlation between the systemic vascular resistance and the cardiac output before and after bypass