Dental Burr - an overview | ScienceDirect Topics
Turn a flame-shaped dental burr anticlockwise (to give a finer cut) in the hole to countersink (Fig. 33.14); a few turns initially using a 1.50- or 2.00 mm drill will speed up the process. Countersinking should be continued equally on both sides of the lens until examination under magnification (e.g. a slit-lamp) shows the two countersinks almost meeting.
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