Diamond is the hardest of all known materials. Dental diamond burs are most often used to grind away tooth tissue, usually enamel. The grinding motion of a diamond bur leaves a rough surface. They are needed when a cut requires extreme precision.
Diamond has high hardness and excellent physical and chemical properties. The diamond lathe needle with certain cutting ability is made by sticking or electroplating the diamond grains with certain sharp angle with the central axis of stainless steel lathe needle as the center in certain direction and spacing. The selected needle shall not be easy to deform, have high stability and fracture resistance, have no tip collapse or Desanding, and have good concentricity in rotation. Attention should be paid to the rotation speed of the needle, especially when operating large diameter needle and coarse-grained needle, too high rotation speed of the needle will produce too much heat, resulting in pulp and tooth tissue damage.