IN G.V black formula. The instrument of the angle of the blade to the long axis of the handle; (in black three number formula)?
- A- First number (blade width)
- B- Second No. (blade length)
- C- Third No. (blade angle).
the G.V. Black formula uses three numbers to describe dental instruments, and determining the correct answer requires understanding their specific meanings.
Here's a breakdown of each option and why C.
Third No. (blade angle) is the correct answer:
A. First number (blade width):
This is represented by the first number in the formula and indicates the width of the blade in tenths of a millimeter. For example, a "10" in the first position would signify a blade width of 1.0 mm.
B. Second No. (blade length):
This is represented by the second number and indicates the length of the blade in millimeters. For instance, a "5" in the second position would mean a blade length of 5 mm.
C. Third No. (blade angle):
This is indeed the third number and specifies the angle of the blade relative to the long axis of the handle. It's typically measured in clockwise degrees, usually ranging from 40 to 50 degrees. This angle determines the instrument's accessibility and approach to the tooth surface.
Therefore, C. Third No. (blade angle) is the correct answer as it directly indicates the angle of the blade, which is crucial information for identifying and utilizing the instrument effectively.
