CONELOG SCREW-LINE surgical procedures

16 CONELOG ® SCREW-LINE IMPLANT DRILL SPEEDS The drill speed depends on the diameter. The recommended speeds are 300–800 rpm depending on the drill type (handpiece angle reduction ra- tio 16:1–20:1). The recommended maximum drilling speed for thread tapping is 15 rpm (handpiece angle reduction ratio 70:1–100:1). The tap adapter for the torque wrench also allows manual tapping. The lower edge of the depth mark is the reference for the preparation depth. COOLING OF DRILLS The cooling occur through external irrigation on the angled hand piece with sterile saline solution (pre-chilled to 5°C/41°F). DRILL LIFE Drill longevity depends on bone quality and drilling technique. The pilot drills, pre-drills, and form drills are good for 10–20 times. If excessive force has to be applied because of a dull drill, then change the drill immediately to prevent bone overheating. CAUTION The maximum apical externsion length of the drill is 0.4 mm. SURGICAL PROCEDURE Article drilling speed (rpm) Round bur – 800 Pilot drill with/without depth stop 2.0 mm 800 Pre-drill 1.7–2.8 mm 600 Form drill with/without depth stop 3.3 mm 550 3.8 mm 500 4.3 mm 400 5.0 mm 350 Form drill cortical bone 3.3 mm 550 3.8 mm 500 4.3 mm 400 5.0 mm 350 Tap 3.3 mm max. 15 3.8 mm 4.3 mm 5.0 mm