INBDE (Integrated National Board Dental Examination) Practice Exam

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Practice this question and more.

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

Width of the blade in tenth of millimeters
Angle the cutting edge makes with the handle in degrees
Length of the blade in millimeters
Angle the entire blade makes with the handle in degrees

The correct answer is: Width of the blade in tenth of millimeters

In an instrument formula, the first number typically represents the width of the blade in tenths of millimeters. This measurement is important as it helps in determining the size and function of the instrument. Option B is incorrect because the angle the cutting edge makes with the handle in degrees is not typically the first number in an instrument formula. Option C is incorrect as the length of the blade in millimeters is not usually the first number in the formula. Option D is also incorrect as the angle the entire blade makes with the handle in degrees is not the primary consideration represented by the first number in an instrument formula.