Fogorvosi szemle, 1996 (89. évfolyam, 1-12. szám)

1996-03-01 / 3. szám

Endod. J. 22, 211, 1989. — 8. Dummer, P. M. H., Hutchings, R., Hartles, F. R.: Comparison of two sonic handpieces during the preparation of simulated root canals. Int. Endod. J. 26, 159, 1993. - 9. Forsberg, J.: A method for experimental dental radiography. Int. Endod. J. 25, 93, 1992. — 10. Greene, K. J., Krell, К. V.: Clinical factors associated with ledged canals in maxillary and mandibular molars. Oral Surg. Oral Med. Oral Pathol. 70, 490, 1990. - 11. Harty, F. J., Stock, C. J. R.\ The giromatic system compared with hand instrumentation in endodontics. Brit. Dent. J. 137, 239, 1974. — 12. Hoskinson, A. C.: Endodontic hand instruments: the relationship between prepared apical form and flexibility. Msc Report, University of London, 1982. - 13. Hülsmann, M., Stryga, F.: Comparison of root canal preparation using different automated devices and hand instrumentation J. Endod. 19, 141, 1993. - 14. Keszthelyi I.: Űj gyökércsatornatágító műszer: a Giromatic. Fogorvosi Szemle 60, 218, 1967. - 15. Martin, H., Cunningham, W. T., Norris, J. P.: A quantitative comparison of the ability of diamond and К-type files to remove dentin. Oral. Surg. 50, 566, 1980. - 16. Röllinger, J., Fritz, U., Eifinger, F. F.: Vergleichende REMUntersuchung nach Wurzelkanalaufbereitung mit den Intraendoköpfen 3-LDSY und 3-LD. Dtsch. Zahnärztl. Z. 45, 748, 1990. — 17. Schilder, H.\ Cleaning and shaping the root canal. Dent. Clin. North. Am. 18, 269, 1974. - 18. Schneider, S. W.: A comparison of canal preparations in straight and curved root canals. Oral Surg. 32, 271, 1971. — 19. Stamos, D. E., Sadeighi, E. M., Haasch, G. C., Gerstein, H. : An in vitro comparison to quantitate the debridement ability of hand, sonic and ultrasonic instrumentation. J. Endod. 13, 434, 1987. - 20. Tronstad, L., Niemczyk, S. P.: Efficacy and safety tests of six automated devices for root canal instrumentation. Endod. Dent. Traumatol. 2, 270, 1986. — 21. Turek, T., Langeland, E.: A light microscopic study of the efficacy of the telescopic and the Giromatic preparation of canals. J. Endod. 10, 437, 1982. - 22. Weine, F. S., Kelly, R. F., Lio, P. J. : The effect of preparation procedures on original canal shape and on apical foramen shape. J. Endod. 1, 255, 1975.

Dr. Dobó Nagy, Cs., dr. Bartha, K., dr. Bernáth, M., dr. Szabó,

J.: A comparative study of different root canal instruments tested on natural human teeth.

A total of 460 roots of extracted human teeth were divided into three groups i. e. straight, apically curved and entirely curved groups. Each of the three groups were divided into seven subgroups according to instrumentation by conventional hand, К-Flex file, 3-LD, 3-LDSY, Excalibur, MM 1400 and Endo Sonic. Radiographs were taken both clinical and proximal views before and after the enlargement of canals. An assessment of shaping characteristic of instrumentation was made on the basis of overimposed radiographs including perforation, ledge formation, smoothness of wall contour, incidence of elbow and zip, measurements at the elbow level and asymmetry measurements. The majority of enlarged root canals were asymmetrical in shape. High differences were found between the incidence of elbow and zip formation. Under laboratory conditions, the KFlex file produced minor canal aberrations and significantly less asymmetry than the conventional instrument. But both the above mentioned instruments caused perforations on curved

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