Hello every one. I am working on modelling dental implant and need some guidelines. I have completed the initial step for implant which is to create cavity inside a jaw. For this i have used 4 mm Drill. Now i the next step is to remove the drill bit and to make a room for abutment structure. For this i have to reverse the motion of drill bit in upward direction. Please guide me, do i need to define additional step and what could be suitable boundary condition for reverse motion of drill bit out of jaw structure ? Please refers to attach file for more detail