Modeling based experimental investigation on polymerization shrinkage and micro-hardness of nano alumina filled resin based dental material.

This paper investigates the effect of %wt composition of BisGMA/TEGDMA, stirring time, bench time, curing time and filler loading on polymerization shrinkage and micro-hardness of resin based dental composites. The investigation was carried out in two stages. In first stage, samples were prepared with different %wt composition of BisGMA/TEGDMA, stirring time, bench time, and curing time to access the effect of different input parameters for minimum polymerization shrinkage and maximum micro-hardness using Taguchi methodology. Selecting optimum values of input factors from first stage, second stage optimization was performed to investigate the effects of different filler loading on different %wt composition of BisGMA/TEGDMA using full factorial design. Prediction model was developed using Design Expert software and analysis of effect of input parameters on output responses were carried out using 3D surface plots. ANOVA were performed to check the significance of prediction model. In first stage, optimum stirring time, bench time and curing time were found to be 4 h, 50 min and 30 s, respectively. In second stage, optimum polymerization shrinkage and micro-hardness of 3.54% and 310 Hv were predicted at 22.89% of TEGDMA content and 20% filler loading. Taguchi methodology and full factorial design were successfully implemented to access the effect of multi-input parameters on responses for resin based dental composites.

Consumption of indigenous medicines by pregnant women in North India for selecting sex of the foetus: what can it lead to?

BACKGROUND: Sex ratio is an important indicator of development. Despite all the measures undertaken for improvement, it remains an issue of concern in India, with Haryana having a very low sex ratio in the country. Studies have been conducted indicating that consumption of indigenous drugs used for sex selection (SSD) could be strongly associated with adverse effects on the foetal development, including congenital malformations. Some samples of SSDs were collected from parts of North India and analysed in a standard laboratory for its components. METHODS: Thirty SSDs used by the local community were procured from various sources in north India through a rigorous process of collection. These were subjected to laboratory tests to investigate the presence of phytoestrogen and testosterone. Following sample extraction, thin layer chromatography and high performance liquid chromatography were carried out for analysing phytoestrogen content. RESULTS: SSDs were available in various forms such as powder, tablets, mostly from faith healers. Around 87% of the samples collected from sources like doctors, quacks and faith healers were to be taken by the pregnant women after conception; 63% drugs were strongly positive for phytoestrogens (genistein, daidzein, formononetin) and 20% drugs were positive for testosterone. The average dose of the components as calculated after analyses was as follows: daidzein--14.1 mg/g sample, genistein--8.6 mg/g sample, formononetin--5 mg/g sample. CONCLUSION: These SSDs could be potentially detrimental to the growth and development of the foetus. This is likely to have implications on the health of the community. In view of the results obtained in our study, we strongly attest the importance in curbing this harmful practice by banning the supply of the drugs as well as by advocating behavioural changes in the community.

Indigenous Medicine Use for Sex Selection During Pregnancy and Risk of Congenital Malformations: A Population-Based Case-Control Study in Haryana, India.

INTRODUCTION: Congenital malformations (CMFs) are a major public health problem in India. Consanguineous marriages, infections during pregnancy, folic acid deficiency during the periconceptional period, exposure to pesticides and a history of intake of drugs during pregnancy have been hypothesized as risk factors. Drugs include oral contraceptive pills, progesterone analogues, medications for ailments and indigenous drugs to bear male offspring. It is important to analyze the risk factors in order to implement preventive measures. The prime objective of this study was to study the risk factors of visible structural CMFs, with a focus on indigenous medicines for sex selection. METHODS: A population-based, case-control study was undertaken in Haryana state. Cases included children (0-18 months) with any apparent structural deformity as reported by various Government sources. A consecutive birth from the same area as the case was labelled and included as the control. The sample size calculated was 175 in each group. Mothers of every case and control were interviewed at their respective homes using a structured tool. Descriptive analysis, bivariate analysis, followed by logistic regression was conducted to establish the association between risk factors and CMFs. RESULTS: The sociodemographic profiles of the cases and controls were similar. Among the various risk factors studied, more than two living children (unadjusted odds ratio [OR] 1.6, 95 % CI 1.04-2.4) and intake of sex-selection drugs (unadjusted OR 2.8, 95 % CI 1.6-5.1) were significant risk factors on bivariate and regression analyses. The risk of having a child with CMFs was threefold more among mothers with a history of intake of indigenous medicines for sex selection (adjusted OR 3; 95 % CI 1.7-5.6). CONCLUSIONS: The intake of indigenous drugs during pregnancy increased the risk of CMFs almost threefold. This has social as well as economic implications, and hence needs further investigation.