I can find no match for periotsim, but Peridot Sim is a simulated version of the type of chrysolite called peridot, or olivine, which is a genuine chrysolite that is usually olive-green and found in volcanic rocks and meteorites.
If you mean PerioSim, it is a valuable dental Virtual Reality system that shows a 3-D model of part of a lower arch and has controls to create a transparent model in which the teeth, bones and other structural elements are visible.
I'm not sure what "periotsim" refers to. Could you please provide more context or details so I can better understand and assist you?