Effect of Dressing Period of Calcium Hydroxide on Apical Marginal Leakage (An in Vitro Study)

Aim: The aim of this study was to detect the effect of dressing period of calcium hydroxide medicament on the apical marginal leakage after obturation of root canal system. Materials and Methods: 80 freshly extracted single rooted human teeth were selected ,all the root canals were hand-instrumented. They were randomly divided into four groups of 20 teeth each. Group A has no intracanal medicament , groups (B,C,D) were dressed with Ca(OH)2 paste for a different periods of time (7,14,30) days respectively, groups (B,C,D) were divided into subgroups of 10 teeth according to removing of dressing . The removal of ca(OH)2was done by two ways, 1- By irrigating with distilled water and drying with paper points . 2- Size 40 k-file was used in slightly filing motion up to the working length then irrigated with distilled water and drying with paper points. After that all groups were obturated with lateral compaction technique using gutta-percha points and zinc oxide-eugenol cement. Then the access was sealed with GIC cement. The teeth were immersed into 2% mythylene blue solution ,The specimens were placed in an incubator at 37 C ,with moisture at 100%, for 7 days .After that the roots were sectioned longitudinally and examined with stereomicroscope and liner leakage was measured.

An-In-Vivo Comparison Study of The Effect of Some Materials Which Used in The Treatment of Infected Root Canals

This study aims to evaluat of the effect antibacterial for some materials which are used dressing and irrigating fluids in infected root canal then compare of the effectiveness of each of The irrigating fluids and materials used Dressing in infected root canal The sample of study was 90 cases a single infection root canal , were divided into three group and applied to the total of each such substance(calcium hydroxide with sodium hypochlorite ,calcium hydroxide with Iodoform, chx) and then conducted the transplant bacterial. The cases were evaluated in terms of results of bacterial culture. The study showed that chx best antidote infection of calcium hydroxide with sodium hypochlorite and calcium hydroxide with Iodoform

Study The Effect of High Doses of Some Seed-dressing Fungicides on Delaying The Infection by Chickpea Ascochyta Blight

This field study was carried out at EL- Gab Research Center during furing 2000-2001. Six fungicides namely, Benomyl 50%, Difenoconazole, Diniconazole, Fludioxonile, Triticonazole and Thiram 37.5% + Carboxin 37.5% with high doses×1, ×2, ×4, ×8 were used as seed dressings on chickpea cultivar Gab3 to study their effects on Ascochyta blight infection. The results showed that fungicides eradicated the infection from the seeds and protected the seedlings from infection. There was a clear effect on delaying the infection by ascochyta blight on chickpea for about 10-15 days in comparison with the untreated control. However, Higher doses of some fungicides negatively affected the yield.