Antibacterial, physical and mechanical properties of bonding agent containing synthesized Zinc Dimethacrylate.

BACKGROUND: The aim of this study includes synthesis of zinc dimethacrylate ionomer (ZDMA) by a new method, incorporate it into resin bonding and evaluate its antibacterial, physical and mechanical properties. MATERIAL AND METHODS: Resin adhesives containing 0 to 5% wt of ZDMA was produced and the following tests were accomplished: A: Antibacterial test: 1.Direct contact test. 2.Material aging; in both of them the bacterial colony counting were performed. B: Physical test: 1.Degree of conversion (D.C). 2.Evaluating the amount of released Zinc ion release in aqueous medium. C: Mechanical test: 1.Compressive strength test. 2.Shear bond test (enamel and dentine separately). The obtained results were statistically analyzed using One Way ANOVA and LSD post hoc test (α=0.05). RESULTS: The anti-bacterial test revealed that all the ZDMA containing groups significantly reduced the amount of Streptococcus Mutans bacteria. Moreover, the D.C in all ZDMA groups was enhanced. Furthermore, ion release analysis revealed noticeable stability of Zn2+ in samples, as in the 5wt.% group it was even after nine cycle of 24h wash. On the other hand, the compressive strength was significantly reduced just in the 5% ZDMA group while the other groups were superior comparing to the control. In addition, there was no significant difference among the enamel shear bond strength of the groups. However, about the dentine shear bond strength, only the 5% ZDMA group was significantly higher than the control. CONCLUSIONS: Low percentages of ZDMA in adhesive could impart anti-bacterial efficacy without challenging its mechanical and physical properties. Key words:Dental Resin Bonding, Zinc, Streptococcus mutans, Degree of conversion, Compressive strength.

Fig extract drying: The relationship between the main operating parameters of a pilot-scale spray dryer and product specifications.

This study aims to optimize extraction and drying conditions of fig syrup. Drying was done in a pilot scale two-fluid nozzle spray dryer. A total of 27 experiments were conducted with varying inlet air temperatures, air flow rates, and also a maltodextrin (MD)- low methoxyl pectin (LMP) ratios. While feed rate, feed temperature, and compressed air flow rate of the atomizer were kept constant. The results of differential scanning calorimetry revealed that high levels of glucose and fructose in the extract resulted in a low glass transition temperature of fig syrup. By an increase in the inlet air temperature, the powder bulk density decreased. However, the MD:LMP ratio and the air flow rate were not significantly effective (p < 0/05) in changing the bulk density. SEM micrographs of spray-dried particles and particle size distribution analysis showed that particles were largely in a range of 5 to 50 µm. The best powders were obtained at an inlet air temperature of 170°C.

Association between Parental Addiction and Types of Child Abuse in High-School Students of Kerman, Iran.

BACKGROUND: Child abuse is one of the vulnerabilities that threaten child's physical and mental health in childhood and is associated with serious short-term and long-term complications. The present study aimed to review the association of parental addiction with types of child abuse in high-school students of Kerman, Iran. METHODS: In this cross-sectional study, 360 students were recruited and studied through cluster sampling method. Abuse and the related factors were assessed using a standard self-report 48-item questionnaire. FINDINGS: Average child abuse among the study subjects was 27.6%. Physical behavior, negligence, and emotional abuse were seen in 9.7%, 23.6%, and 17.9% of the subjects, respectively. Parental addiction had a significant association (P = 0.001) with incidence of all the child abuse domains. CONCLUSION: Special consideration to families of addicted parents and early identification of child abuse cases may prevent the adverse side effects.

The estimation of direct medical costs of treating patients with chronic hepatitis B and C in iran.

BACKGROUND: The objective of this study is to estimate the average diagnosis and treatment costs of chronic hepatitis B and C, with respect to different therapeutic strategies in Iran. METHODS: This is a descriptive, analytical, and cross-sectional study carried out on patients with hepatitis B and C, who were referred to the Liver Disease Research Center for Prevention and Treatment of Hepatitis, Isfahan University of Medical Sciences, in 2011. We have estimated the direct medical costs including doctors' fees, cost of para-clinical tests, medical treatments, and liver biopsy, in different treatment strategies. FINDINGS: The results of this study showed that the total cost of diagnostic services for hepatitis B virus (HBV) and hepatitis C virus (HCV) patients, with state medical tariffs, was US$ 1499.07 and US$ 2084.89, respectively. The patients' profiles showed that there were currently seven therapeutic strategies available to treat HBV patients. The total cost of treatment strategies varied significantly from US$ 73 to US$ 8256. There were also four main strategies for HCV patients, each of these could be applied in two periods of time. The total cost of these treatment strategies showed a high discrepancy from US$ 242 to US$ 8256. CONCLUSION: The results confirmed that the total direct medical cost for an HBV patient in Iran exceeded US$ 5.5 Milliard in 2011. The results implied that the market price of direct medical cost of HBV and HCV patients in Iran is much higher than the estimated state costs. These costs would likely be saved or reduced by effective disease management and early prevention.

An efficient one-pot synthesis of octahydroquinazolinone derivatives using catalytic amount of H2SO4 in water.

In this investigation, a practical green chemistry procedure for synthesis of octahydroquinazolinone according to the Biginelli reaction using 5,5-dimethyl-1,3-cyclohexanedione, urea or thiourea, and appropriate aromatic aldehydes in the presence of two drops of concentrated H(2)SO(4) as a catalyst is described in water. This methodology is of interest due to the use of water as a solvent without use of any organic solvent and toxic metals as catalyst, thus minimizing the cost, the operational hazards, and environmental pollution. Also this modified route provides much higher yields and simple work-up procedure of products.