Abstract: Method for drilling a hole for placement of an implant therein in which an initial hole is formed in the jaw bone having a diameter smaller than a desired diameter for placement of the implant and a depth smaller than a desired depth for placement of the implant. A flat ledge is formed in the bone around the initial hole by the same drill bit which forms the initial hole. The initial hole is then enlarged to the desired diameter and the desired depth using another drill bit which is designed to contact the ledge when the initial hole has been enlarged to exactly the desired depth. Penetration of the drill bit into the jaw bone once the hole has been enlarged to the desired depth is therefore prevented.