Patent ID: 8337204

Claim:
A dental rotary tool comprising: a blank having a shaft portion and a head portion; a single layer of grit disposed upon the blank, the grit comprising at least one of spaced apart individual diamond crystals and spaced apart clusters of diamond crystals, the diamond crystals each having a base and extending to a generally uniform height above the surface of the blank, said grit covering less than about 90% of the surface area of the head portion; and a bonding material comprising a braze composition that is generally limited to a fillet surrounding only the bases of the diamond crystals at the surface of the blank, thereby forming interconnected void spaces on the blank between the diamond crystals, the interconnected void spaces providing continuous micro-channels for cooling the diamond crystals and removing debris, the micro-channels extending to the surface of the head portion, said head portion having a thin film of braze bonding material and a thin film of braze bonding material on a portion of the sides of the diamond crystals, the braze bonding material durably captivating the diamond crystals to the blank while leaving a major portion of the diamond crystals free of braze bonding material and available for cutting.