INBDE (Integrated National Board Dental Examination) Practice Exam

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In an instrument formula, what does the third 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: Length of the blade in millimeters

The third number in an instrument formula represents the length of the blade in millimeters. This is different from the first number which represents the width of the blade, and the second number which represents the angle of the cutting edge. Option A is incorrect as it describes the first number. Option B may seem like a possible answer, but it actually describes the second number which is the cutting angle. Option D is also incorrect as it refers to the entire blade, whereas the third number only represents the length of the blade.

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