| 摘要 |
The instrument for working in the tooth root channel has a longitudinal handgrip (1) with a shape of rotation symmetry, where the center section (2) is of a smaller diameter. The thinner center section has a number of surface pimples (3) in a partial spherical or truncated cone shape, with a base diameter of 0.5-1.5 mm. The surface carries at least 10 pimples and a maximum of 40. |
