In vitro evaluation of erbium, chromium:yttrium-scandium-gallium-garnet laser-treated enamel demineralization.
This study evaluated the effect of different parameters of erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser irradiation on enamel mineral loss in a simulated caries model. Forty-five enamel samples obtained from third molar teeth (3 mmx 3 mm) were randomly divided into five groups (n = 9): G1-Er,Cr:YSGG laser at 0.25 W, 20 Hz, 2.8 J/cm(2); G2-Er,Cr:YSGG laser at 0.50 W, 20 Hz, 5.7 J/cm(2); G3-Er,Cr:YSGG laser at 0.75 W, 20 Hz, 8.5 J/cm(2); G4-sodium fluoride (NaF) dentifrice (positive control); G5-no treatment (negative control). After irradiation, the samples were submitted to 2 weeks of pH cycling. After the acid challenge, the samples were assessed by cross-sectional microhardness at different depths from the enamel surface. Analysis of variance (ANOVA) and Student-Newman-Keuls tests were performed (alpha = 5%). The percentage of lesion inhibition for each group was: G1 37%; G2 38%; G3 64%, and G4 50.5%. Regarding the relative mineral loss values (micrometers x volume percent), groups G1 (1,392 +/- 522) and G2 (1,292 +/- 657) did not differ significantly from each other, but both had higher values than group G3 (753 +/- 287); the groups irradiated with Er,Cr:YSGG laser did not differ from group G4. Although the findings of the study revealed that Er,Cr:YSGG laser irradiation at 8.5 J/cm(2) can be an alternative for the enhancement of the enamel's resistance to acid, lower energy densities also produced a cariostatic potential comparable to the use of fluoride dentifrice.
de Freitas
Patrícia M
PM
Department of Restorative Dentistry, School of Dentistry, University of São Paulo (USP), Prof. Lineu Prestes, 2227, Cidade Universitária, Butantã, São Paulo, SP 05508-900, Brazil.
Rapozo-Hilo
Marcia
M
Eduardo
Carlos de P
Cde P
Featherstone
John D B
JD
D000143:Acids; D003731:Dental Caries / Q000517:prevention & control; D003743:Dental Enamel / Q000187:drug effects / Q000528:radiation effects*; D006245:Hardness Tests; D006801:Humans; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D053844:Lasers, Solid-State / Q000627:therapeutic use*; D012969:Sodium Fluoride / Q000494:pharmacology; D017001:Tooth Demineralization / Q000517:prevention & control*
D000143:Acids; D012969:Sodium Fluoride
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