The invention includes apparatuses and methods for implanting dental implants in a patient's mouth that ensure that the implants are in the proper rotational position and depth. In one aspect, the invention includes a surgical guide with a guide tube having an indexing mechanism that mates with a corresponding indexing mechanism on a flange of an implant mount when the mount is used to screw an implant into a patient's mouth. This mating signals that the dental implant is in the proper rotational position and depth.