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Biomedical subjects

S Papić

Publications and source records attributed to S Papić.

10 recordsLinked to original sources

[Masticatory values of dental prostheses anchored to depulped teeth].

The progress of conservative and surgical treatment of pulpless teeth has increased the number of pulpless teeth within prothetic restorations. There is a dilemma about masticatory values of such teeth and about the maximum load they can bear, that is, what masticatory values the denture anchored to them will have. Tooth values were measured by gnatodynamometry. We used gnatodynamometer with electroresistant metal measurement strips whose deformity is proportional to the force which the tooth, namely, the denture, bears. Measurements were carried out on a sample of 33 pulpless teeth, that is, on the almost same number of dentures anchored to the teeth. The measured pulpless teeth showed lower values than control teeth. The control group comprised normal teeth of the same subject, the sam jaw, which neutralized the problem of individuality. After the prothetic reconstruction by which the tooth regained its function, we checked mastication values again, this time the values of the dentures anchored to the pulpless teeth. We can conclude that pulpless teeth have lower values than vital ones. The lower values resulted also from their dysfunction. Prothetic reconstruction increases mastication values of pulpless teeth, but they never reach the values of controls, namely, of vital teeth.

Bite Force↗

The role of zeolites in wastewater treatment of printing inks.

The adsorption of residual organic pollutants from flocculated printing ink wastewater onto several synthetic zeolites was investigated as a finishing method for additional reduction of TOC. The nonselective removal of total organic content was studied. The amount of adsorbed organics was largest for ZSM-5 and NH4-Beta while the other zeolites studied showed lower efficiency, suggesting that adsorption is independent of pore structure. The adsorption rates of organic pollutants were fast. Although the TOC removal increases with increasing amount of zeolite, because of the necessity of additional filtration to lower turbidity to required levels, 5.0 g/L of zeolite was found to be optimum. The 88% reduction of TOC obtained with a single flocculation treatment was improved with the combination of flocculation and adsorption with ZSM-5 which resulted in the overall TOC efficiency of 95%. The addition of zeolites in decantated supernatant water, obtained after flocculation, was also studied in order to assess the effect of floc on zeolite capacity. A decrease in adsorption capacity occurred only if a coagulant concentration less than optimal was applied. Removal efficiency then decreased by around 10%. It was concluded that flocculation followed by adsorption with zeolites is an effective treatment method for this kind of wastewater.

Adsorption↗