The combined finite element method and the maximum principal stress analysis gave insight into the fracture mechanisms of teeth with two-surface composite restorations followed by root canal preparation. Removal of tooth tissue, despite its subsequent restoration with dental materials, weakened the tooth by changing the stress intensity and distribution through tooth structures. Access cavity preparation had the greatest influence on tooth strength whilst canal enlargement did not contribute to this process substantially.
This study aimed to develop a methodology for fast analysis of municipal solid waste applicable in developing countries. For this purpose, a case-study of quantification and morphological municipal solid waste analysis in ten Serbian municipalities with diverse socioeconomic status was conducted from July 2008 to May 2009. The methodology was based on collating quantitative and qualitative data directly from the field and represents the first reliable information on the municipal waste characteristics at the national level. Random household solid waste samples were collected for morphological analysis, done manually, whilst for quantitative evaluation, MSW was collected and weighed over a seven-day period in three different seasons. Data analysis showed that the quantity of generated waste varies from 0.28 kg capita-1 day-1 to 1.54 kg capita-1 day-1 , following the average income of the municipality under study. By extrapolation, Serbia annually produces over two million tonnes of municipal waste. Morphological composition analysis shows that organic waste represent 49.76% of the total mass quantity. It is followed by plastics and cardboard with their sub-categories (12% and 8% respectively); glass (5.44%), paper (5.34%) etc. This methodology is applicable to any region with underdeveloped waste management systems and the results are valuable starting point for developing waste management strategies as well as for creating laws and regulations in this field.
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