INSTRUMENT FORMULA

○ 3 DIGIT
WIDTH OF BLADE ー LENGTH OF BLADE ー ANGLE OF THE BLADE

○ 4 No formula ー 2nd no. is added

○ Angle former, Gingival Marginal Trimmer

WIDTH OF BLADE ー ANGLE OF CUTTING EDGE ー LENGTH OF BLADE ー ANGLE OF THE BLADE

GRASPS

○ Modified pen grasps ー most commonly used clinically
○ Inverted pen grasp
○ Palm and thumb grasp ー least preferred clinically [70-110 degree] ー most used in sharpening Instrument
○ Modified palm and thumb grasp