|Chisel||1. a wedgelike instrument with a cutting edge at the end of the
blade. 2. a dental instrument whose cutting edge is in line with the
center of the handle; used for planing or smoothing a surface, as during
periodontal chisel, a straight instrument that curves slightly as the blade extends from the shank, the straight cutting edge at the end of the instrument being beveled at a 450 angle. Used chiefly for scaling the proximal surfaces of teeth too closely spaced to permit the use of other scalers. Called also chisel scaler.