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The necessity for a sharp trephine in performing the Elliot sclerocorneal trephining for glaucoma is undebatable. A mounted dental Arkansas stone can be obtained from a dental supply house or a dentist.
A wet mounted stone, as shown in 1 of the accompanying illustration, is placed in the rotary chuck of a dental engine and sharpened in a circumferential manner on the outside beveled portion of the trephine, as shown in 2. The full amount of sharpening should be done on the outer beveled portion. The wire edge is removed by a light circumferential reaming on the inside of the trephine, as shown in 3. The revolving stone should not be forced down to occlude the trephine opening, as the stone will "jam." Caution should also be observed not to produce an internal bevel or "cornucopia" effect. This condition might cause a serious complication should the sclerocorneal plug drop into
Stewart M. A QUICK METHOD FOR SHARPENING OCULAR TREPHINES. Arch Ophthalmol. 1940;24(4):797–798. doi:10.1001/archopht.1940.00870040183018