| 摘要 |
PROBLEM TO BE SOLVED: To allow anyone to easily check a gradient of a blade inner face of a Gracey curette.SOLUTION: A blade inner face gradient checker includes a front face on which at least one type of Gracey curettes 70, 80, 90,..., a protractor 14, and one reference line 15 that extends in the lateral direction and connects a position of 0 degree and a position of 180 degrees in an outermost periphery of the protractor 14, are drawn. In the front face, the tip of a blade of at least one type of the Gracey curettes 70, 80, 90,... faces the near side, and the inner face of the blade becomes parallel to the reference line 15. The Gracey curettes 70, 80, 90,..., the blades of which are placed on the reference line 15 at an intersection point 17 of the reference line 15 and a perpendicular line 16 that passes through the position of 90 degrees in the outermost periphery of the protractor 14 and orthogonally crossing with the reference line 15, are drawn on the front face. |
