INBDE (Integrated National Board Dental Examination) Practice Exam

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In an instrument formula, what does the fourth number represent?

  1. Width of the blade in tenth of millimeters

  2. Angle the cutting edge makes with the handle in degrees

  3. Length of the blade in millimeters

  4. Angle the entire blade makes with the handle in degrees

The correct answer is: Angle the entire blade makes with the handle in degrees

In an instrument formula, the fourth number represents the angle the entire blade makes with the handle in degrees. This is an important aspect to consider when selecting instruments for different procedures, as the angle of the entire blade can affect how effectively the instrument can be used in specific clinical situations. Option A is incorrect because the width of the blade is typically represented by the first number in an instrument formula, not the fourth. Option B is incorrect because the angle the cutting edge makes with the handle is usually represented by the second number in an instrument formula, not the fourth. Option C is incorrect because the length of the blade is typically represented by the third number in an instrument formula, not the fourth.

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