![]() The small end of the instrument measures 0.4 mm in diameter and 1.5 mm in length, and the larger end of the instrument measures 0.75 mm in diameter and 2.0 mm in length. ![]() Richard Stevenson’s prep evaluation device will easily show you the ideal and maximum allowable extensions and pulpal depth of your class II preparations, and the incisal reduction of PFM preparations. Here it is – the UNIQUE and completely indispensable “RGS One Two” preparation calibration instrument! Made of high grade stainless steel from precision manufacturing by Hu-Friedy, Dr. Richard Stevenson Dental Preparation Calibration Instrument - the RGS 1-2.
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