Chapter 02: Enamel Cutting Instruments Boyd: Dental Instruments, 6th Edition MULTIPLE CHOICE 1. On a three-number enamel cutting instrument, what does the third number indicate? a. Angle of the cutting edge of the blade in relation to the handle in millimeters b. Angle of the blade from the long axis of the shaft in millimeters c. Width of the blade in tenths of millimeters d. Length of the blade in millimeters ANS: B On a three-number cutting instrument, the numbers on the handle indicate width, length, and angle of the blade. The third number indicates the angle of the blade. REF: Page 17 TOP: CDA, GC, II. Chairside Dental Procedures 2. On a four-number enamel cutting instrument, what does the third number indicate? a. Angle of the cutting edge of the blade in relation to the handle in millimeters b. Angle of the blade from the long axis of the shaft in millimeters c. Width of the blade in tenths of millimeters d. Length of the blade in millimeters ANS: D On a four-number instrument, the numbers represent the width of the blade, the angle of the cutting edge, the length of the blade, and the angle of the blade. The third number indicates the length of the blade in milNlimUeRteSrsI.NGTB.COM REF: Page 19 TOP: CDA, GC, II. Chairside Dental Procedures 3. On a three-number enamel cutting instrument, what does the first number indicate? a. Angle of the cutting edge of the blade in relation to the handle in millimeters b. Angle of the blade from the long axis of the shaft in millimeters c. Width of the blade in tenths of millimeters d. Length of the blade in millimeters ANS: C On a three-number cutting instrument, the numbers on the handle indicate width, length, and angle of the blade. The first number indicates the width of the blade in tenths of millimeters. REF: Page 17 TOP: CDA, GC, II. Chairside Dental Procedures 4. On a three-number enamel cutting instrument, what does the second number indicate? a. Angle of the cutting edge of the blade in relation to the handle in millimeters b. Angle of the blade from the long axis of the shaft in millimeters c. Width of the blade in tenths of millimeters d. Length of the blade in millimeters ANS: D
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