Fig. 1From: A comparative study of the effect of drilling depth on generation of compressive force by headless compression screws using conical and cylindrical type of drill bitThe Acutrak® mini drill bit has a conical type, where the diameter increases from 2.0 mm to 3.5 mm from the leading end to the trailing end. The Synthes 3.0 HCS® drill bit has a cylindrical type with a constant diameter of 2.0 mmBack to article page