study of the possible hazards of acute and chronic exposure to microwaves on hepatorenal function and some blood trace elements in albino rats

Microwave exposure possess some degree of health hazards, the objective of the present study was the investigation of the possible effects of acute and chronic exposure to radiation on some liver, kidney, tissue antioxidants enzymes as superoxide dismutase, glutathione peroxidases, glutathione and toxic free radical lipid peroxide that results from stress oxidative tissues damage as well as the effect of microwaves on some trace elements that acts as metalloenzyme as zinc, selenium, copper and manganese. The result of the present study showed that exposure to microwaves [acute and chronic] produced significant reduction of antioxidant enzymes as superoxide dismutase, glutathione peroxidase and glutathione content. It also produced significant increase in toxic free radical malondialdehyde. These changes are more manifested with acute exposure [7 days]. The parameters of this study were improved with concomitant administration of DDB [well known antioxidant and tissue protective]. Also, the results showed that there was significant impairment of liver and kidney parameters with acute exposure and still there were changes in chronic which were insignificant. The parameters of liver and kidney were improved by the administration of DDB concomitantly

study of the bending strength of different repair materials

Several techniques and materials have been used to repair fractured dentures. The ultimate goal is to restore the original strength of the denture and to avoid their further fracture. The aim of this study was to measure the bending strength of heat cure acrylic resin, self cure acrylic resin and visible light cure resin, as a new material used in dentistry and also study the transverse strength of the repair materials in the presence of wire in the area of repair. The results showed that the transverse strength of the heat cure resin was more than self cure resin and visible light cure resin. Presence of wire in the repair area weakens the acrylic base

Effect of different teeth form on the muscular activity of edentulous patients

Complete dentures were constructed for five subjects following the conventional methods and using cusped teeth. Another five complete dentures were constructed for the same patients using cuspless teeth. Direct EMG recording the muscle activity were taken bilaterally for the anterior temporal muscle and the masseter muscle of each patient. These records were retaken for each patient when the other type of teeth was used. The records were taken during mastication of soft food and harsh rough food. The results showed that the muscle activity was noticeably higher in complete dentures having cuspless teeth than those having cusped teeth