| 摘要 |
The reamer has two or three flutes with two to seven turns. The reamer is increasingly tapered in an apical-coronal direction. A pitch of the reamer progressively increases from a root tip towards a crown. An angle of a spiral remains substantially constant to vary by not more than +-25 percentage. Depth of a groove increases when the diameter of the reamer increases. An independent claim is also included for a dentistry kit. |
