Astra Tech DRILLS
OsseoSpeed TX S, TX
Fig. 1
Externally cooled, latch type, single use (Fig.1, left) and multi use
(Fig.1, right) drills are offered from Astra. Multi use drills are
titanium nitrate plated (gold color) and may be used 15 to twenty times
while single use drills are silver in color. All drills are color coded
according to the drill diameter and depth markings are laser etched on
the cutting portion of the drills. Four different, task specific drill
designs comprise the Astra drill set.
Twist Drill
Fig. 2
Twist drills (Fig.2) from 2.0mm to 4.85mm diameter are the primary drills to
achieve the desired osteotomy depth and diameter. Nine different single
use and eleven multi use drills constitute each set. The average drill
step increase from twist drill to twist drill after omitting the first
2mm drill is 0.356mm for single use drills and 0.285mm for multi use
drills, resulting in a less time consuming but more aggressive
drill
sequence for single use drills. Each set is offered in two osteotomy
depth versions of 8-13mm and 8-19mm. Two specialized single use drills
marked at 6mm to facilitate 6mm implants are available separately.
Pilot Drill
Fig. 3
Pilot drills (Fig.3, left) are a optional step in the drill sequence, primarily used in
dense bone. If the recommended twist drill sequence for a particular
implant is to great of a jump (from 2mm to 3.2mm for example) in osteotomy
sites with D1 bone or a thick cortical plate is present, a pilot drill
may be used to pre enlarge the osteotomy. This will make it easier to
insert the next large twist drill in the sequence.
Cortical Drill
Cortical drills (Fig.3, right) are recommended in dense bone types (D1) for TX S
implants only. These drills are used before
the last twist drill in the osteotomy diameter dependent drill sequence.
Conical Drill
Fig. 4
Conical drills (Fig.4) are used in all bone types for TX implants only to
accommodate the funnel shaped top half of the implant. These
drills are used before the last twist drill in the osteotomy diameter
dependent drill sequence for D1 bone and the last drill in D2, 3 and 4
bone types. A 1mm wide black band on the drill serves as a indicator how
deep to drill into the different bone types. The top of the band should
be even with the crest of the bone for D1 and 2 bone and the bottom of
the band should be just at the crest for D3 and 4 bone.