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When providing care, to protect a part of the human body against resins and plas ters for certain time, it is necessary to use a circular knitted band in cotton as a raw material. The generating of Cotton fiber fly throughout the knitting process is due to interactions of frictional surfaces with the hairiness of ring spun yarn. During the manufacture short fibers are formed in the machine device, this problem is more important with the use of cotton yarns. In this research paper, the short fibers formation on circular knitting machines from spun yarns such as cotton is investigated The knitting conditions consist of; yarn tension, yarn feeding speed and the angle contact of the yarn with guides and needles. The results obtained illustrate the effect of yarn tension on the short fibers deposit caused by the combination of yarn friction with the knitting elements.

Causes mechanical, thermal, chemical, electrochemical related to the oral environment are effects ranging from simple weathering of biomaterial to the final break, through irreversible deformation, the more invisible and insidious. Study closer to all of these requirements and how to reconcile them is the goal of our work involves the development and analysis of the cements commonly used by dentists and especially cement oxy - zinc phosphate. The powder of zinc phosphate cement is typically made of zinc oxide annealing, alone or mixed with other oxides. The choice and dosage of these oxides must reflect the requirements presented to the concrete (resistance to crushing, shear, acidity, toxicity, solubility, etc .). Thus the formulation of the composition cement needs to have an optimal mix of different components to achieve desired quality cement. Therefore, we limited the number of formulas or mixtures confined to the study of a unique blend of high purity raw materials which we have subjected three regimes of firing at a fixed temperature of 1350° C. The test results show that the cement produced is of very good quality and meets the required standards.