根管の機械的拡大に使用する器具に関する研究(第 2 報)

概要

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An observation on the transformation of screw-shaped blade of hand-reamer occurring with using for mechanical enlargement of root canal-wand were employed through measuring microscope (PRM-3XYZ). The materials available for this study consisted of a total of 561, 293 in Maillefer's reamers, 268 in Colorinox's reamers (table 1) which came into go out of use in endodontic practice of the hospital attached to this college. The deformation of blade form were observed as attrition or extension of each screw margin for the most part. The range of such changes (1_2 ; see Figure 1) within an effective blade was very variable according to each type of handreamer used. The measurement values obtained were as follows. 1. The range of deformation in Maillefer's No.1 reamers were 0.577 to 7.310mm distant out of the apex of reamers, in No.2, 3, 4, 5, 6 reamers of the same kind, 0.496 to 6.867mm, 0.493 to 6.697mm, 0.616 to 6.026mm, 0.591 to 6.936mm, 0.695 to 7.298mm, respectively. 2. Those in Colorinox's #15 reamers were 0.685 to 7.180mm distant out of the apex of reamers, in #20, 25, 30, 35, 40 reamers of the same kind, 0.426 to 6.375mm, 0.491 to 5.944mm, 0.804 to 5.996mm, 0.668 to 6.141mm, 1.119 to 6.842mm, respectively. 3. From the results mentioned above, it is considered that we should be careful fully in clinical common treatment of available reamers when the range of deformation came up to less than 8.0mm from the apex.
九州歯科学会の論文
1977-03-31