جستجوی مقالات مرتبط با کلیدواژه "ferric sulfate" در نشریات گروه "پزشکی"

Objectives The current study aimed at optimizing the coagulation-flocculation process to treat metal working fluids (MVF) by calcium chloride and ferric sulfate using response surface methodology (RSM).
Methods The removal efficiencies of chemical oxygen demand (COD), turbidity, and the amount of released oil via coagulation process using calcium chloride and ferric sulfate as coagulants were studied. Central Composite Design (CCD) and RSM were used to optimize the operating variables including coagulant dosage and pH. Quadratic models were developed for the 3 responses of COD, turbidity, and released oil from MWF.
Results The results of the current study indicated that the optimum conditions were calcium chloride dosage of 4 g/L at pH 3.5. The COD, turbidity removal efficiency, and oil releasing from MWF were 93%, 96.9%, and 31.8 mL, respectively and the level of desirability was 91.2%. Optimum condition for ferric sulfate was 6.5 g/L at pH 4.5. The COD, turbidity removal efficiency, and oil releasing from MWF were 62.1%, 93.6% and 13.7 mL, respectively and the level of desirability was 91%.
Conclusion Coagulation-flocculation process using calcium chloride, compared with conventional coagulants such as ferric sulfate, was very effective on pollutants removal. Calcium chloride usage was 35% less than common coagulant while removal efficiency was greater.

The control of parenchymal hemorrhage especially in liver parenchyma, despite surgical science progresses, is still one of the challenges surgeons face saving the patients’ lives and there is a research challenge between the researchers in this field to introduce a more effective method. This study aimed to compare the hemostatic effect of calcium sulfate and ferric sulfate on controlling the bleeding from liver parenchymal tissue. In this animal model study 60 male wistar rats were used. A length of two cm and a depth of half a cm incision was made on each mouse’s liver and the hemostasis time was measured using calcium sulfate and ferric sulfate different concentrations (15%, 25%, and 50%). Finally, the obtained data were entered into SPSS software and analyzed using Kruskal-wallis test, Mann – Whitney, Kolmogorov – Smirnov and also Wilcoxon signed ranks test. In all groups we had complete hemostasis. The hemostasis time of calcium sulfate concentration groups was significantly less than that of the ferric sulfate group (p<0.01). Calcium sulfate and ferric sulfate can control liver bleeding and both are effective hemostatic agents in controlling liver parenchymal tissue hemorrhage in an animal model.

Introduction & Despite all the progress in surgical sciences, controlling parenchy-mal hemorrhage especially in liver parenchyma, is still one of the challenges surgeons face in saving patients’ lives. Therefore, introducing an effective method to control liver bleeding is an important research priority. This study attempts to determine the haemostatic effect of fer-ric sulfate and zinc chloride and compare it with that of the standard method (simple suturing technique) in controlling bleeding from liver parenchymal tissue. This is an experimental study. In this animal model study 70 male Wistar rats were randomly allocated into seven groups. An incision, two centimeters (cm) long and half a cm deep, was made on each rat’s liver and the hemostasis time was measured once us-ing ferric sulfate and zinc chloride with different concentrations (15%, 25%, and 50%) and then using the control method (i.e. controlling bleeding by simple suturing). The liver tissue was examined for pathological changes. Finally, the hemostasis times were entered into SPSS software and analyzed using Kruskal- wallis test, Mann-Whitney, Kolmogorov-Smirnov test. The mean time to hemostasis in groups of ferric sulfate concentration of 50%, 25% and 15%, were, respectively, 9.50±1.17, 21.80±2.2,and 37.8±2.7 seconds, and in groups of zinc chloride concentration of 50%, 25% and 15%, were, respectively, 15.80±1.75, 30.20±2.57 and 49.00±2.21 seconds also in the control group (suture) mean time of hemosta-sis was 91.30±7.30 seconds. The haemostatic times of different concentrations of ferric sul-fate and zinc chloride were significantly less than that of the control group (P< 0.01). There was a statistically significant difference between different concentrations of ferric sulfate and zinc chloride haemostatic times (P < 0.01). The pathologic examination showed the highest frequency of low grade inflammation based on the defined pathological grading. Ferric sulfate and zinc chloride compared to the control method (i.e. controlling liver bleeding by simple suturing) needs less time to control liver bleeding. Ferric sulfate is a more effective hemostatic agent than zinc chloride in controlling liver bleeding in an animal model.

Formocresol has been used for primary molar pulpotomy in the past but numerous alternatives have been introduced because of its disadvantages. One of these substitutes is hypochlorite sodium (Naocl) which has shown satisfactory results in spite of few studies on it. The aim of this study was to compare clinical and radiographic success rates pulpotomy treatment in primary molars using 5% sodium hypochlorite versus ferric sulfate (FS) 15.5%. In this study, pulpotomies were performed in mandibular second primary molars in 60 teeth which had sufficient indications for pulpotomy. In each Patient, one tooth was randomized into FS pulpotomy group and one tooth in Naocl group. The teeth were pulpotomised and treated with FS or Naocl. Fallowing treatment, the pulp chamber was Filled with zinc oxide eugenol (ZnOE) and restored with a stainless steel crown. Clinical and radiographic outcomes were recorded at 6 and 12 months. Outcomes were evaluated with Fishers exact test. Both groups (FS as control group and Naocl as experimental group demonstrated 100% clinical success rates at 6 months. But at 12 months clinical success rate for Naocl was 100% compared with 93.3% for FS (P=0.22). Radiographic success rates for Naocl and FS were 96.7% and 100% respectively at 6 months (P=0.5) and 93.7% and 97.3% at 12 months (P=0.5). No significant differences were found in the radiographic and clinical outcomes between the two groups at 6 and 12 months. Naocl demonstrated clinical and radiographic success rate comparable to FS in primary molar pulpotomy.

Recently, ferric sulfate has been introduced as an alternative to formocresol in primary teeth pulpotomies. The most common cause of failure in ferric sulfate pulpotomies is internal resorption, but the main reason for this side effect has not been elucidated. The aim of this study was to compare the clinical and radiographic success rates with the use of different base materials following ferric sulfate pulpotomy. Pulpotomies were performed in 105 primary mandibular molars in 35 patients under six years of age (3 teeth in each patient). After traditional ferric sulfate pulpotomy, one of the three test materials, ZOE, Ca(OH)2 or MTA, was randomly assigned to each tooth. The pulp chambers were filled with IRM and restored by SSCs. Clinical and radiographic evaluations were carried out at 6- and 12-month follow-up visits. Data was analyzed with chi-square and Fisher’s exact tests (α=0.05). After 12 months, MTA group demonstrated higher overall success rate (100%) when compared with ZOE (86.67%) and Ca(OH)2 (80%) groups. There was a statistically significant difference between Ca(OH)2 and MTA groups (p value = 0.024). Internal resorption was the principal cause of radiographic failure in Ca(OH)2 and ZOE groups. Given the limitations of the present study, Ca(OH)2 cannot be recommended as a base material after ferric sulfate pulpotomy. It appears the base material has an important role in the success of ferric sulfate pulpotomy.

Ferric sulfate pulpotomy is a safe and effective method of the pulpotomy of primary teeth. But the results of different studies indicate low success rate of ferric sulfate pulpotomy in comparison to Formocresol pulpotomy and a portion of these failures may be related to stimulating and harmful effects of zinc oxide Eugenol paste. The aim of this study was to determine and compare the clinical and radiographic success rate of ferric sulfate pulpotomy of primary molars with zinc oxide eugenol and zinc polycarboxylate cements in order to determine the more suitable pulp capping material for ferric sulfate pulpotomy.

In this randomized trial study, 140 primary molar teeth in children between3-5 years old, with the treatment plan of pulpotomy were randomly allotted to one of two groups ferric sulfate pulpotomy with zinc oxide eugenol and zinc polycarboxylate cements. After treatment, pulpotomized teeth were double blindly evaluated clinically and radiographically and Fisher's exact test was used for analysis of data.

Clinical success rate in one year evaluation in two groups of zinc oxide eugenol and Zinc polycarboxylate was 98.1% and 93.9%, respectively that was not significantly different. (P=0.34). In one year evaluation, radiographic success rate was 96.30% in zinc oxide eugenol group and 91.8% in zinc polycarboxylate group but this difference was also not significant(P=0.42).

In ferric sulfate pulpotomy, it is not preferable to use zinc polycarboxylate cements as a subbase instead of zinc oxide eugenol cement.