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1. The combined use of Er,Cr:YSGG laser and fluoride to prevent root dentin demineralization

Author

Vinícius Rangel GERALDO-MARTINS, Cesar Penazzo LEPRI, Juliana Jendiroba FARAONI-ROMANO, and Regina Guenka PALMA-DIBB

Subjects
Lasers, Fluorides, Hardness, Dentin, Dentistry, RK1-715
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. Objective: To 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 Methods: One 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%). Results: The 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

Published
2014
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2. The combined use of Er,Cr:YSGG laser and fluoride to prevent root dentin demineralization

Author

Cesar Penazzo Lepri, Regina Guenka Palma-Dibb, Vinícius Rangel Geraldo-Martins, and Juliana Jendiroba Faraoni-Romano

Subjects
Materials science, Time Factors, Surface Properties, Dentistry, Lasers, Solid-State, Dental Caries, Statistics, Nonparametric, law.invention, chemistry.chemical_compound, Fluorides, law, Hardness, Reference Values, Sodium fluoride, Dentin, medicine, Humans, Irradiation, Hardness Tests, Tooth Root, Dental Enamel, General Dentistry, Tooth Demineralization, Analysis of Variance, Enamel paint, business.industry, Lasers, Reproducibility of Results, Water, Dose-Response Relationship, Radiation, Original Articles, Laser, lcsh:RK1-715, Demineralization, Cold Temperature, medicine.anatomical_structure, chemistry, lcsh:Dentistry, visual_art, visual_art.visual_art_medium, Knoop hardness test, Sodium Fluoride, business, Fluoride, Nuclear chemistry
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. Objective: To 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 Methods: One 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%). Results: The 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

Published
2014

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