Dan Butterman I've been using the Verban drill stops with the CG2 for some time and have enjoyed lots of success with it. I recently started using the new version of the drill stop made for the Densah burs and like it a lot better.
The original drill stop fits up against the hub of the handpiece, so the vertical depth is controlled when the handpiece bottoms out on the guide.
The new version of the drill stop sits passively on the Versah drill and can slip up and down until the stop makes contact with a silicone ring that you place on the drill at your desired D2 depth. It also has a lip that engages the guide. This allows more flexibility in setting the D2 value and makes for an easier vertical stop depending on the geometry of the guide.
The D2 is calculated by adding up the length of the implant, the distance from the implant platform to the gingival crest, and the length of the stop. I like to add 1mm on to that length to make sure the stop doesn't prematurely contact the gingiva before the final depth is reached.
In speaking with Dr. Verban, I believe there will be a modification with the silicone stops being made of metal and added to the stop, but the premise will remain the same. This stop allows the ostetomy to be performed for most implant types and situations using a minimum amount of costly instruments.
