INBDE (Integrated National Board Dental Examination) Practice Exam

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In a dental instrument with a formula of 10-85-8-14, what does the number 85 refer to?

Blade length in millimeters
Width of blade in tenths of a millimeter
Primary cutting edge angle
Blade angle

The correct answer is: Primary cutting edge angle

In a dental instrument, the formula 10-85-8-14 refers to the sizes and angles of the different parts of the instrument. The first number, 10, likely represents the overall length of the instrument in millimeters. The second number, 85, refers to the primary cutting edge angle. The third number, 8, may indicate the width of the blade in tenths of a millimeter. The fourth number, 14, could possibly represent the blade angle. However, the primary cutting edge angle, which is the angle at which the blade makes contact with the tooth, is the most important measurement in a dental instrument and is often denoted by the second number in the formula. Therefore, the number 85 refers to the primary cutting edge angle in this case.