title: Measurement of pressure changes during laser-activated irrigant by an erbium, chromium: yttrium, scandium, gallium, garnet laser.
abstract: The use of Er,Cr:YSGG laser to activate irrigants results in the creation of vapour bubbles and shockwaves. The present study evaluated the magnitude of pressure changes in the root canal during laser-activated irrigation. The root canal of a single extracted maxillary canine was enlarged to a size 40/0.06 file. A pressure sensor was inserted apically into the root canal. The tooth was processed as follows. In the EDTA condition, the tooth was irrigated with 17 % EDTA; in the NaOCl condition, the tooth was irrigated with 3 % NaOCl. In all conditions, the irrigants were activated at 0.75 and 1.75 W for 60 s using RFT2 and MZ2 tips; to analyse the effect of tip placement, the tip was activated at the orifice and after inserting the tip 5 mm deeper than the orifice. Data showed no significant difference between irrigation regimens (p > 0.05). There were no significant differences of the pressure between RFT2 and MZ2 tips (p > 0.05). The placement of tips closer to the apex resulted in significantly higher pressure than at the orifice (p < 0.001). The use of 1.75 W power resulted in a significantly higher increase of pressure compared to 0.75 W (p < 0.001), regardless either the type of solutions or tips used. The magnitude of the pressure changes in the root canal at 0.75 W was significantly lower than 1.75 W regardless of either type of tips or solutions used. The closer the insertion of the tip to the apex, the higher the pressure.
authors.affiliation: Laser Research Center, Cihampelas 41, Bandung, West Java, 40116, Indonesia, h2huiz@cbn.net.id.
authors.forename: Harry Huiz
authors.initials: HH
authors.lastname: Peeters
authors.forename: Roeland J G
authors.initials: RJ
authors.lastname: De Moor
mesh_terms: D000818:Animals; D003481:Cuspid / Q000473:pathology; D006801:Humans; D053844:Lasers, Solid-State; D011312:Pressure; D012388:Root Canal Irrigants / Q000528:radiation effects*; D012390:Root Canal Therapy / Q000379:methods*
chemical_list: D012388:Root Canal Irrigants