Bullet-shaped drills are preferred in Dental implant surgery as they used to mark the initial pilot mark in the bone and as an aid in guiding the drilling sequence. These drills have a rounded self-centering tip which can increase stability on irregular bone surfaces and minimize drill slippage resulting in better angulation in the initial phase of osteotomy preparation. But, in some cases they are not totally essential for correct implant positioning.
The accuracy of the procedure more depends on facts such as Cone-beam computed tomography planning, guided or nonguided, drill design, bone type, clinician experience level, drilling protocol. Most often correctly used pilot drills or guided systems can provide the same accurate placement. The drill design is a valuable feature, but not the sole criteria for implant accuracy.