Evaluation of the permeability of the furcation area of deciduous molars conditioned with Er:YAG laser and cyanoacrylate

the purpose of this study was to evaluate in vitro the dentin permeability of the deciduous pulp chamber floor after employing 2-octyl cyanoacrylate and er:yag laser. twenty four deciduous molars were used, divided into four groups. after chemical-surgical preparation each group received a different treatment: group 1 - control, without treatment; group 2 - the floor of the pulp chamber was covered with a fine layer of 2-octyl cyanoacrylate; group 3 - the floor of the pulp chamber was irradiated with er:yag laser (250 mj, 10 hz for 30 seconds, 80 j of energy and 320 pulses), and covered with a fine layer of 2-octyl cyanoacrylate; and group 4 - the floor of the pulp chamber was irradiated with er:yag laser set at the parameters already described. after that the specimens received application of 0.5% methylene blue, for 15 minutes. the teeth were cut, photographed, and the digitalized images were analyzed using the imagelab program. the results obtained were submitted to statistical analysis. group 4 (er:yag) presented the largest averages in percentage of dye penetration area (19.5%), followed by group 1 (11.1%), group 3 (1.4%) and group 2 (0.2%). the experimental model allowed to conclude that the specimens conditioned with 2-octyl cyanoacrylate (group 2) and er:yag laser associated to 2-octyl cyanoacrylate (group 3) presented a decrease in permeability, and the specimens treated with er:yag laser (group 4) presented an increase in permeability of the analyzed area.