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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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Get PriceIn addition, many mechanical devices were introduced, notably the Lewis drill from 1838, Chevalier's *''drill stock'' from the 1850s or earlier, and Merry's drill of about 1858. In 1871, Morrison introduced his foot treadle dental engine. 30 This was the first practical foot operated dental engine to be used in dentistry, although John ...
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