Expanding needles are commonly used instruments in dental treatment, with different shapes and functions, and therefore different selection techniques. Correct selection techniques can improve treatment results and minimize the occurrence of complications.
1、Material: usually stainless steel and carbon steel.
1.1 Stainless steel: more flexible, but not as strong as carbon steel, so it is generally used to pre-treat softer root canals.
1.2 Carbon steel: stronger, suitable for treating harder root canals.
2、Length: choose the appropriate length of the enlarging needle according to the length of the root canal, generally choose a length slightly longer than the root canal can be
3、Diameter: Diameter: Choose the appropriate diameter of the enlarging needle according to the diameter of the root canal, generally choose a slightly thicker diameter than the root canal can be.
4、Shape: Choose the shape of the enlarging needle according to the curvature and calcification of the root canal, generally choose a shape that is slightly larger than the curvature of the root canal.
