The Application of Nano Silver Argitos as a Final Root Canal Irrigation for the Treatment of Pulpitis and Apical Periodontitis. In Vitro Study

Background: Endodontic treatment of various forms of pulpitis with variations of root canal system anatomy should be performed with high quality. The use of various antibacterial agents is aimed at maintaining the success of endodontic treatment. The aim of this study was to evaluate the penetration and fixation of the nano-silver solution on the dentinal surface during endodontic treatment. Materials and methods: the study was carried out on 70 extracted single-rooted teeth, randomly divided into two groups. In the teeth of the first group, the smear layer was removed after canal preparation with 17% EDTA solution; in the second group, the smear layer was not removed. In both groups, for the final treatment of the canal, a colloidal 1% solution of нанo серебра nanosilver was used. Samples were cut and prepared for analysis using micro-CT, scanning electron microscopy (SEM), X-ray microanalysis and energy dispersive spectrometry (elemental mapping). Results: in 100% of cases in groups of teeth with a preserved smear layer, the ability of a 1% colloidal solution of nanosilver with particles of 1–2 nm to be fixed on dentin with a removed and preserved smear layer and to leave a film on the dentinal surface was established. In the samples with removed smear layer, silver was found in 73.5% of cases. Conclusion: The nano-silver solution with a particle size of 1–2 nm proved its ability to penetrate the dentinal surfaces and create a final film covering the dentinal surface of the root canal before applying the sealer.

The EFFECT OF HYDROPHYTES ON THE PERFORMANCE OF SECONDARY CANAL

The hydrophytes in canal effect directly canal performance by reducing water velocity, enhances sedimentation and reduce canal cross section area which raise water level and reduces water flow. Indirectly the hydrophytes detaches from their origin and flow with water stuck with outlet and reduces its proportionality. In this regard a study was conducted on secondary canal known as Yar Husain Minor (YHM) of Maira Branch Canal, which is part of the Upper Swat Canal Irrigation System in Khyber Pakhtunkhwa, Pakistan. Maira Branch Canal and its secondary canal were designed for Crop Based Irrigation Operation (CBIO), which could supply irrigation water for maximum copping intensity (180%) even during peak periods of irrigation requirements. The current water allowance was 0.67 Ls-1 ha-1 (6.6 mm day-1), which was based on the maximum crop water requirements. The several challenges for operation of YHM and other secondary canals of Maira Branch came from physical barrier mostly in the form of hydrophytes on the performance of YHM canal. Further challenges came from the fact that it receives water from River Swat which is turbid in summer and River Indus (Tarbela Reservoir) which is clear with low turbidity. This caused sedimentation and growth of hydrophytes in the YHM. Furthermore Triangular Profile Crump’s weirs were in all secondary canals including YHM for proportional division to the tertiary outlets (moghas). The study objectives were to investigate the effects of hydrophytes on canal capacity and at the outlets on the performance of the YHM. Hydrophytes growth was observed in head reaches of canal and samples were collected and were identified at the Department of Weed Science & Botany, The University of Agriculture Peshawar. Five types of aquatic weeds were identified. The hydrophytes growth in canal head reaches directly reduces the cross section by more than 50%. Indirectly the detached hydrophytes were get stuck in the outlets and affected its performance. Therefore, daily discharges were measured with/without detached hydrophytes at each outlet from staff gauging. Frequency was based on days stone hydrophytes present divided by total time. It was concluded that secondary canal performance was low due to hydrophytes. The hydrophytes and users interventions influenced the outlets performance by 80%. Trifurcators type outlets were more prone to influence by hydrophytes followed by bifurcators outlet.

From Royal Canal to Neglected Canal? Changing Use and Management of a Traditional Canal Irrigation System in Peri-Urban Kathmandu Valley

In this chapter we discuss the changing uses and management of a traditional canal irrigation system against the background of processes of urbanization in Kathmandu Valley in Nepal. Until urbanization of Kathmandu Valley took off in the 1980s, the management of stream-fed canal irrigation systems had been a priority of both state agencies and the population that depended on agriculture-based livelihoods. The name rajkulo (royal canal) given to these systems expresses the historical interests of (royal) state actors in canal maintenance and management. Fed by a stream called Mahadev Khola in Dadhikot, a peri-urban village in Kathmandu Valley, Mahadev Khola Rajkulo is such a traditional canal irrigation system. Using an in-depth case study of this system, we analyse the interlinkages of demographic, socio-environmental, economic and local political dynamics with the changing canal uses and management. More specifically, we discuss how and why various actors became associated with, or dissociated from, canal use and management in recent times, and what these processes mean for water access, rights and security. We reflect on the implications of these changes for canal management and canal-related conflicts, against the background of national urban policies that formally aim to conserve agricultural land in Kathmandu Valley, but stimulate urban expansion in practice.

Scientific Management Practices Followed by Sheep Rearing Farmers in Raichur District of Karnataka, India

Livestock is one of the most remunerative enterprises among the farming community the present study was undertaken to know the scientific sheep management practices by sheep owners in Raichur and Lingasugur taluks of Raichur district. For this purpose, 6 villages from each taluks were selected on the basis of highest sheep population. Ten respondents drawn from each selected village with 120 sample size. The data was collected through structured schedule and the data were analyzed by using appropriate statistical methods. The findings of the study indicated that a large majority of the sheep owners (85.00%) administer the drugs for de worming in lamb management, followed by providing of fresh and clean water (83.33%) and proper bedding material (80.00%) in winter season. With regards feeding management of the sheep, a large majority of the respondents (85.00%) allowed their sheep for grazing in community land Nearly one fifth of the respondents provided green fodder throughout the year as their land comes under the canal irrigation provision, in addition to bore well facilities. Further, 100% of the respondents had proper floor space for the sheep size with cleaning padlock regularly in housing management practices. It is worth to note that 83.00 per cent of them monitor heat detection in sheep and provided treatment to the animals which were suffering from reproductive disorder (87.50%).This is mainly due to the availability of veterinary services in the locality. With regards health management practices, cent percent of the respondents check up the health of the sheep regularly and administer vaccination as scheduled (4/annum) and disinfection of the padlock in order to prevent the disease.

Effect of Sodium Hypochlorite Concentration in Continuous Chelation on Dislodgement Resistance of an Epoxy Resin and Hydraulic Calcium Silicate Sealer

The conditioning of the root canal wall during chemo-mechanical root canal treatment differentially affects the adhesion of root canal sealers. This investigation evaluated the impact of sodium hypochlorite (NaOCl) concentration as used in a root canal irrigation concept called continuous chelation, with 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) contained in the NaOCl solution that is applied. Fourier-transform infrared spectra of the dentinal wall were gathered. The consequential effects on push-out bond strength of an epoxy resin (AH Plus) versus a hydraulic CaSi sealer (BioRoot RCS) were assessed. Single-rooted extracted human teeth were used and irrigated with pure NaOCl at a concentration of 0% (physiological saline), 2.5%, or 5.25%. Dual Rinse HEDP (9%) was added to the solutions, or not added for further control. Pure NaOCl solutions caused a decrease in the amide III: phosphate ratios, which was counter-acted by the addition of HEDP. It was observed that the adhesion of the epoxy resin sealer under investigation was negatively affected by this NaOCl deproteinization of the canal wall in a dose-dependent manner, while the opposite was observed with the CaSi sealer. HEDP when used in conjunction with NaOCl was beneficial for the adhesion of both sealers.

ANTIBACTERIAL EFFECTIVENESS OF LERAK FRUIT ETHANOL EXTRACT (Sapindus rarak DC) AND 2% CHLORHEXIDINE IN Enterococcus faecalis

The failure of a root canal treatment can be caused by the facultative anaerobic bacteria Enterococcus faecalis, which should be eliminated throughout root canal irrigation. Chlorhexidine 2% is a popular antibacterial liquid used in root canal irrigation. Natural substances can also be used to make antibacterial irrigation liquids. One natural substance with antibacterial properties is lerak fruit extract (Sapindus rarak DC), containing 28 per cent of saponins, alkaloid compounds, polyphenols, antioxidant chemicals, and flavonoid groups and tannins. This study was conducted to determine the effectiveness of 25% lerak fruit extract (Sapindus rarak DC) against E. faecalis compared to 2% Chlorhexidine. This study is a pure experimental study using the agar diffusion method against three experimental groups chlorhexidine 2% as a positive control, lerak fruit extract (Sapindus rarak DC) as a treatment group, and aquadest as a negative control. Each group was repeated ten times on Muller Hinton Agar (MHA) media which was applied using a paper disc. Then the diameter of the inhibition zone was calculated using a caliper. The results in this study, 25% lerak (Sapindus rarak DC) fruit extract had an average inhibition zone diameter of 11.775 mm, and an average inhibition zone diameter of 2% chlorhexidine was 19.745 mm. The difference in the diameter of the inhibition zone was significantly different in all groups. Conclusion ethanol extract of lerak fruit (Sapindus rarak DC) 25% can inhibit the growth of E. faecalis and can be used as an alternative to other antimicrobial agents as disinfection of root canal irrigation.

Estimation and Canal Conveyance Losses in Pune District

Water is a very precious natural resource. When this precious resource moves through the canals certain part of the water is lost by seepage, evaporation etc. This loss is known as conveyance loss. In present paper, study of Nira Left Bank Canal (NLBC) is done which is situated in Pune district. Total length of canal is 162 Km out of which 30 Km is our study area. Discharge calculations at the head of canal and at 30th Km is done, two standing wave flumes are present at these two locations. Since last few decades, the extensive underutilization has been found in canal irrigation. This issue constitutes the serious lacuna in irrigational planning which often depicts the major problem about optimal water use. As per FAO Aquastat 2015 records for India, out of 91% of water utilized for agriculture purpose, 45% is getting lost under different types of conveyance losses from dam headworks till farms. The conveyance losses constitute the seepage and evaporation losses. Out of these, seepage is a quite significant loss in most of the water conveyance systems. Estimating conveyance losses using physical methods is quite difficult and involves lots of field work and calculations, whereas empirical and analytical methods will not accommodate site condition of respective study area. This study attempted to assess the conveyance loss of Nira Left Bank Bank Main canal with the help of a hydraulic model built on a spatial platform and verified with flow-monitoring events. The hydrospatial model was simulated to understand the canal behaviour and evaluate the conveyance losses. The results show Nira Left Bank Main canal has average 39.96% water conveyance loss.