Patent ID: 6267595
Filing Date: 2001-07-31
Classification: A61C

Abstract:
A rotary machining tool for use in the field of dentistry, comprising:(a) a clamping shaft portion (3);(b) a cylindrical machining head portion (1) arranged collinearly relative to said shaft portion, said head portion having a first end adjacent said clamping shaft portion, and a rounded second end remote from said clamping shaft portion;(c) a neck portion (2) connecting said head portion first end with said shaft portion;(d) a layer of nickel (4) covering at least the cylindrical circumferential surface of said head portion;(e) a plurality of diamond particles (5) embedded in said nickel layer, said particles being in contiguous engagement with said head portion cylindrical surface and protruding outwardly from said nickel layer; and(f) a layer of chromium nitride (6) completely covering the protruding portion of said diamond particles and the external surface of said nickel layer, said chromium nitride layer having a thickness of from 1 to 4 .mu.m, whereby said chromium nitride layer fills the uneven surface structure of the diamond particles as well as any gaps separating said nickel layer and said diamond particles.