Guided implant placement: water cooling issues?

Authors

Does the use of a surgical guide prevent the proper cooling of the bur upon entering the bone? With external cooling, water has limited access to the osteotomy when a surgical guide envelopes the area. Is this an important factor in the use of guides? There are some publications ( I don’t have any references at this time) that claim that some research revealed that water cooling is unessential because every next drill removes the layer of charred bone. The final drill supposedly was of no consequence. What is your experience with surgical guides from that point of view?