The combined use of Er,Cr:YSGG laser and fluoride to prevent root dentin
demineralization |
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Authors: | Vinícius Rangel GERALDO-MARTINS Cesar Penazzo LEPRI Juliana Jendiroba FARAONI-ROMANO Regina Guenka PALMA-DIBB |
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Institution: | 1. Department of Biomaterials, School of Dentistry, Uberaba University, Uberaba, MG, Brazil.;2. Department of Restorative Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil. |
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Abstract: | The use of erbium lasers to prevent caries in enamel has shown positive results.
However, it is not known if Er,Cr:YSGG laser can also be used to increase acid
resistance of root dentine, which is another dental tissue susceptible to the action
of cariogenic bacteria.ObjectiveTo analyze the effects of the Er,Cr:YSGG laser (λ=2.78 μm, 20 Hz) irradiation
associated with 2% neutral sodium fluoride (NaF) to prevent root dentin
demineralization.Material and MethodsOne hundred human root dentin samples were divided into 10 groups (G) and treated
as follows: G1: no treatment; G2: NaF; G3: laser (4.64 J/cm2) with
water cooling (WC=5.4 mL/min); G4: laser (4.64 J/cm2) without WC; G5:
laser (8.92 J/cm2) with WC; G6: laser (8.92 J/cm2) without
WC; G7: laser (4.64 J/cm2) with WC and NaF; G8: laser (4.64
J/cm2) without WC and NaF; G9: laser (8.92 J/cm2) with WC
and NaF; G10: laser (8.92 J/cm2) without WC and NaF. The NaF gel was
applied alone or after 4 min of irradiation. After 14 days of acid challenge, the
samples were sectioned and the Knoop microhardness (KHN) test was done at
different depths (30, 60, 90 and 120 μm) from the outer dentin surface. Data were
analyzed by one-way ANOVA and Fisher''s test (α=5%).ResultsThe results showed that G8 and G10 presented higher KHN than the G1 for the depths
of 30 and 60 μm, indicating an increase of the acid resistance of the dentin in up
to 35% (p<0.05).ConclusionsThe use of Er,Cr:YSGG laser irradiation at 4.64 J/ cm2 and 8.92
J/cm2 without water cooling and associated with 2% NaF can increase
the acid resistance of human root dentin. |
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Keywords: | Lasers Fluorides Hardness Dentin |
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