of fig6 both facilitates the strengthening of the teeth 210 as well as assists in reducing clogging of the leading faces 214 such a slight convex contour is illustrated in fig6 as having a curvature corresponding to a radius of 0 55 inches in e g a convex region 230 along the rim 234 in particular each convex region 230 smoothly blends into the concave curve of the leading face 214 of the immediately trailing tooth 210 and at the opposite leading end of the convex region it smoothly blends into a substantially straight region corresponding to the trailing face 218 of the immediately leading tooth of course the dimensions provided for the cutting plates 154 hereinabove are merely representative of a particular embodiment of the cutting plates 154 such dimensions may be changed as one skilled in the art will appreciate according to e g the diameter of such cutting plates 154 and the size of the bone fragments desired from the bone grinder 10 the dimensions provided hereinabove correspond with a tooth height along a radius from the center point 238 to a tooth edge 222 of approximately u215b of an inch between the tooth edge 222 and the area where the corresponding leading face 214 merges into the corresponding convex region 230 additionally as shown in fig7 the thickness of the cutting plate 154 is approximately 0 1326 inches which is only slightly larger than u215b of an inch thus it is believed that the present dimensions of the embodiment of cutting.