pd4dPD4D is used for endodontics, to remove calcification in the coronal third of the root canal, diamond coated. PD1 is used for Periodontics, periodontal scaling.The PD3DPD4D scaler tips are compatible with their DTE scaler handpieces and NSK orinal. PD3D: Used to level off the surface of endo during periodontal flap