Patent ID: 8870571

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 crystals and spaced apart clusters of crystals, the crystals 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 that is generally limited to a fillet surrounding the crystals at the surface of the blank, thereby forming interconnected void spaces on the blank between the crystals, the interconnected void spaces providing continuous micro-channels for cooling the crystals and removing debris, the micro-channels extending to the surface of the head portion, said head portion having a thin film of bonding material and a thin film of bonding material on a portion of the sides of the crystals, the bonding material durably captivating the crystals to the blank while leaving a major portion of the crystals free of bonding material and available for cutting.