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 8 refer to?

  1. Width of blade in tenths of a millimeter

  2. Primary cutting edge angle

  3. Blade length in millimeters

  4. Blade angle

The correct answer is: Blade length in millimeters

The number 8 in this instrument formula refers to the blade length in millimeters. This is the measurement of the blade from the tip to the end of the shank. Option A is incorrect because it refers to the width of the blade, not the length. Option B is incorrect because it refers to the primary cutting edge angle, which may be referenced in degrees rather than a numerical value. Option D is incorrect because it is too general and does not specify which blade angle it is referring to. It is important to pay attention to units and specific terminology when interpreting instrument formulas.

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