•Crushing, fracturing or roughening heavycalculus for gross removal
•Facilitate removal of “burnished”calculus
•Deep, relatively narrow pockets wherelength/curve of curette blade will not fit
•Palatalsof maxillary anteriors,facials off mandibular anteriors
•Mesialand distal concavities of mandibular molars or cuspids
•Directbuccal or lingual of molar roots or premolars
•Smooth rough CEJ’s
•Root planing using “finishing files” (in your issue)
•challengingin deep areas
•Smoothingamalgam restoration margins or removing overhangs