The type of implant geometry (parallel walled, PREVAIL®/XP®,
tapered) dictates the drill type and protocol in conjunction with the
bone quality of the osteotomy site. Reusable drills are available as
internally and externally irrigated versions. Biomet 3i™ recommends
a lifecycle of up to 20 procedures for reusable drills. Single use drills
are available as non irrigated versions only. Drills are not color coded
with the exception of quad shaping drills for tapered implants. Four
different drill types (twist, pilot, countersink, shaping) are utilized to
achieve a implant geometry specific osteotomy. Twist drills are produced
in four sub categories, ten diameters and six length configurations.
1. Externally irrigated and reusable ACT® (Advanced Cutting Technology).
2. Internally irrigated, reusable and hubbed.
3. Externally irrigated, disposable and hubbed.
4. Externally irrigated and disposable.
Each of the four twist drill types has a different depth marking system,
consisting of lines or bands etched on the cutting surface of the drill.
Depth indicator lines do not represent the actual osteotomy depth as
labeled but create a osteotomy depth 0.6mm deeper than indicated. This,
in conjunction with the actual implants being 0.4mm shorter than labeled,
allows the implant to be placed subcrestally and flush with the crestal
bone with the installed cover screw in place. The
V-Factor
of twist drills
is up to 1.3mm, creating a osteotomy depth up to 1.9mm deeper than
indicated by the depth markings on the twist drill.
Pilot drills are used to enlarge the osteotomy diameter after the initial
twist drill and countersink drills are utilized to shape cortical bone to
accommodate the expanded coronal part of PREVAIL® and XP® implants.
Osteotomies for Certain® and external hex tapered implants are created
with quad shaping drills. Quad shaping drills are offered in five (8.5,
10, 11.5, 13, 15mm) lengths and four (3.25, 4.0, 5.0, 6.0) diameters.
Tapered implant bone taps are tapered implant specific, while all other
implant geometries share a different set of bone taps. Tapping bone is
required in D1 bone and optional for all other bone types.