Abstract: The impacts of dredging on heavy metals concentrations of an urban surface water  body was monitored. This study was carried out for a period of eighteen months, from July 2010 to January 2012. Water samples were collected from 5 stations prior to, during and after dredging. The heavy metal analysis was done using Atomic Absorption Spectrophotometer by Shimadzu  (AAS- Model 6650). Prior to dredging, the values of the heavy metals were as follows: Iron, Fe(0.03-0.58)mg/l, Copper, Cu(0.01-0.25)mg/l, Zinc, Zn(0.09-0.64)mg/l , Manganese, Mn(0.08-0.94)mg/l, lead, Pb(0.01-0.09)mg/l, Cadmium, Cd(0.00-0.02)mg/l, Chromium, Cr(0.01-0.94)mg/l. During  the dredging, the values of the  various metals increased: Fe (6.55mg/l), Cu(5. 11 mg/l), Zn(5.82mg/l), Mn(4.01mg/l), Pb(3.02mg/l), Cd(0.91mg/l), Cr(2.00mg/l).  Nine months after the dredging, the metals declined in this range: Fe (0.11mg/l), Cu(0.97mg/l), Zn (0.75mg/l), Mn(0.17mg/l), Pb(0.08mg/l), Cd(0.01mg/l),  Cr(0.03mg/l). The result of the statistical  analysis  showed significant difference (P< 0.05) for the  variations  in the heavy metals  values of the  water samples. This implies that river-bed sediment has been the reservoir  of these heavy metals,  therefore  the dredged materials once excavated from the river should be capped and confined  in geotubes before disposal. 

Abstract: The aim of the authors is in conditions of clinical study to investigate the masticatory function in patients with different types of prostheses. Normal function requires the coordinated action of many elements, including teeth, salivary glands, tongue, and masticatory muscles. Dysfunction in any of these areas can result in impaired mastication. Missing teeth and old prostheses are concern to the patients and dentists and this can be a multifactorial problem that involves esthetics, phonetics, mastication and swallowing. The pilot study showed necessity of additional study of masticatory function. 

Abstract: The aim of the authors is in conditions of in vitro experiment to make a preliminary study of the effect of simulated body fluid on the calcium phosphate system – K₂HPO₄  and Ca(NO₃)₂. The K₂HPO₄ and Ca(NO₃)₂ system was subjected to in vitro study where calcium phosphates are received on the dentinal tubules and it was monitored the effect of simulated body fluid (SBF) by Kokubo upon the processes of transformation of dried sample of brushite (CaHPO₄2H₂O). The pilot study showed necessity of additional in vitro and in vivo experiments to refine the composition and concentration of applied substances to achieve the effect on dentin mostly congruent with the natural regenerative activity of tooth structure.