Fogorvosi szemle, 2000 (93. évfolyam, 1-12. szám)

2000-10-01 / 10. szám

val retraction cords. J Prosthet Dent 53, 525—531, 1985. — 5. de Gennaro, G. G., Landesman, H. M., Calhoun, J. E., Martinoff, J. T.: A comparison of gingival inflammation related to retraction cords. J Prosthet Dent 47, 384, 1982. - 6. Harrison, J. D.: Effect of retraction materials on the gingival sulcus epithelium. J Prosthet Dent 11, 514-521, 1961. — 7. Kerémi B., Csempész F., Vág J., Györfi A., Fazekas A.: A marginális gingiva véráramlásának vizsgálata lézer Doppler-áramlásmérővel. Fogorv. Szle 93, 163-168, 2000. - 8. Martignoni, M., Schönenberger, A.: Precision Fixed Prosthodontics: Clinical and Laboratory Aspects. Quintessence Publishing Co. 1990 (p. 113). — 9. Nemetz, H.: Tissue management in fixed prosthodontics. J Prosthet Dent 31, 628-636, 1974. — 10. Nemetz, H., Donovan, T., Landesman, II.: Exposing the gingival margin: a systematic approach for the control of hemorrhage. J Prosthet Dent 51, 647-651, 1984. — 11. Pelzner, R. B., Kempler, I)., Stark, M. M., Lum, L. B., Nicholson, R. J., Soelberg, K. F.: Human blood pressure and pulse rate response to racemic epinephrine retraction cord. J Prosthet Dent 39, 287-292, 1978. - 12. Woycheshin, F. F.: An evaluation of drugs used for gingival retraction procedures. J Prosthet Dent 14, 769-776, 1964.

Dr. Fazekas, Á., dr. Csabai, Zs., dr. Csempész, F., dr. Vág, J.: Effect of retraction materials on the blood supply of marginal gingiva

Effect of knitted cord and retraction medicaments applied to achieve gingival displacement prior to taking impression has been studied on the blood supply of marginal gingiva of volunteers using laser Doppler flowmetry. Immediately after application of #00 cord saturated with 0.9% saline, 25% A1C13 or 15.5% Fe2(S04)3 solutions, significant decrease of blood perfusion was registered. Removal of cords containing medicaments resulted in prompt gingival hyperemia. However, vasoconstriction observed as a consequence of cord application saturated with 0.1% epinephrine proved to be long-lasting and persisted even in the 20th min of cord removal. In conclusion our results suggest that the reduced perfusion of marginal gingiva is evoked by the mechanical compression of retraction cord. At the time of making impression, which procedure in clinical practice is due immediately after cord removal, the blood flow of marginal gingiva is elevated. Permanent hypoperfusion can be achieved only by the means of cord impregnated with 0.1% epinephrine.

Key words: retraction materials, blood flow of marginal gingiva, Laser Doppler flowmetry

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