The V-Factor is a sometimes unaccounted for, extra length of osteotomy drills. This extra depth is created by the V shaped tip of the drills and varies from implant manufacturer to implant manufacturer and drill diameter to drill diameter. Most manufacturers disclose the V-Factor for their drills in their literature. It is imperative to be aware of the V-Factor during the planning stage and allow 2mm of space to any vital structures as a safety measure.