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Permeability, morphologic and temperature changes of canal dentine walls induced by Nd: YAG, CO 2 and argon lasers
Author(s) -
ANIĆ I.,
TACHIBANA H.,
MASUMOTO K.,
QI P.
Publication year - 1996
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.1996.tb01354.x
Subject(s) - laser , materials science , smear layer , scanning electron microscope , root canal , argon , permeability (electromagnetism) , penetration (warfare) , lasing threshold , penetration depth , composite material , dentistry , optics , chemistry , medicine , biochemistry , physics , organic chemistry , operations research , membrane , engineering
Summary The permeability, temperature and morphologic changes of the wall of the root canal induced by Nd:YAG, CO 2 and argon lasers were studied. The changes were evaluated according to the presence or absence of a smear layer. Root canals of 140 human single‐rooted teeth were enlarged using a step‐back technique. Permeability was evaluated by the extent of methylene blue dye penetration into the tubules. Temperature changes were measured using a thermovision system, and morphological changes were evaluated by scanning electron microscopy. Laser energy was delivered into the canal by means of a flexible optical fibre or metal tip. There were statistically significant differences in permeability between Iased groups with and without a smear layer in the cervical third of the root canal following lasing. In the middle third of the root canal, all three laser types induced permeability increases in groups with a smear layer. In the apical third, statistically significantly decreases in permeability were observed among C02 laser and Nd:YAG compared with control group (P<0.01). Rises in temperature ranged from a minimum of +10.1 °C (CO 2 laser) to a maximum of +54.8 °C (argon laser). All three laser devices appeared capable of producing a glazed‐like surface and craters.