Which variety of grit should be used to sharpen a dental instrument to be used for tooth preparation?

Stationary oilstones are available in coarse, medium or fine grit.  Only a fine grit stone is suitable for the final sharpening of dental instruments to be used for tooth preparation.  Coarse and medium grits may be used for initial reshaping of a badly damaged instrument or for sharpening other dental equipment such as bench knives.  Coarser stones cut more rapidly, but produce a rougher surface.  If the use of two or more grits is required, the coarser is used as little as needed for reshaping and then the final sharpening is done with a fine stone. Ref: Sturdevant's art and science of operative dentistry. 4th edition page 317