| dc.description | Er:YAG effects on dental enamel surface regarding the resistance
to demineralization and the fluoride incorporation were
evaluated. 80 samples were divided into 8 groups: G1) control -
APF application; G2) conditioning with 37% phosphoric acid
and APF application; G3) irradiation with 250 mJ/pulse, 7 Hz,
31,84 J/cm2 (contact) and APF application; G4) irradiation with
200 mJ/pulse, 7 Hz, 25,47 J/cm2 (contact) and APF application;
G5) irradiation with 150 mJ/pulse, 7 Hz, 19,10 J/cm2 (contact)
and APF application; G6) irradiation with 250 mJ/pulse, 7 Hz,
2,08 J/cm2 (non-contact) and APF application; G7) irradiation
with 200 mJ/pulse, 7 Hz, 1,8 J/cm2 (non-contact) and APF application;
G8) irradiation with 100 mJ/pulse, 7 Hz, 0,9 J/cm2 (noncontact)
and APF application. All samples were immersed in 2,0
M acetic-acetate acid solution, pH 4,5 for 8 hours. The fluoride,
calcium and phosphorous ions were analyzed, by atomic absorption
spectrometry and spectrophotometry. Groups laser irradiated
before topic APF application presented better results than the
control. There was higher fluoride incorporation on G7 and G8.
Calcium and phosphorous analysis reveled a decrease on the
enamel demineralization on G2 and G3 groups. The Er:YAG
laser on irradiation conditions of this work is a promissory alternative
for the Preventive Dentistry. | |
