Pulpdent Pressure Syringe The Original Screw Syringe Device for Filling Root Canal "Fill The Apex First" 40 years of clinical success The original screw syringe device still offers the fastest, most precise and controlled method for obturating root canals with Pulpdent Root Canal Sealer. Fill the apex first and then accurately backfill the remaining canal space using disposable 30, 25, 22 or 18-gauge needles. Sturdy stainless steel construction. Sterilize by any method.