No abstract

Various kinds of experimentsby use of spiral instruments were made by Suzuki with more favorable results than by use of other instruments. Now in this paper 76 clinical cases are presented. The results obtained by determination of its use by radiograms are as follows : Favorable in 50 cases (65.7 %), excess of filling in 9 cases (11.9%), and insufficient filling in 17 cases (22.4%).Thus it could be concluded that most favorable results obtained in case of enlarging the root canal sufficiently.