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Influence of the Nd:YAG laser pulse duration on the temperature of primary enamel.

Valério RA, da Cunha VS, Galo R, de Lima FA, Bachmann L, Corona SA, Borsatto MC - ScientificWorldJournal (2015)

Bottom Line: Fifteen sound primary molars were sectioned mesiodistally, resulting in 30 specimens (3.5 × 3.5 × 2.0 mm).Nd:YAG laser pulse duration provided no difference on the temperature changes on primary enamel, in which the following means were observed: A = EL (23.15°C ± 7.75), B = LP (27.33°C ± 11.32), and C = SP (26.91°C ± 12.85).It can be concluded that the duration of the laser pulse Nd:YAG increased the temperature of the primary enamel but was not influenced by different pulse durations used in the irradiation.

View Article: PubMed Central - PubMed

Affiliation: Clinical Pediatric Dentistry Department, Ribeirão Preto School of Dentistry, São Paulo University, Café Avenue, Monte Alegre, 14040-904 Ribeirão Preto, SP, Brazil.

ABSTRACT
The aim of this study is to evaluate the temperature change on specimens of primary enamel irradiated with different pulse duration of Nd:YAG laser. Fifteen sound primary molars were sectioned mesiodistally, resulting in 30 specimens (3.5 × 3.5 × 2.0 mm). Two small holes were made on the dentin surface in which K-type thermocouples were installed to evaluate thermal changes. Specimens were randomly assigned in 3 groups (n = 10): A = EL (extra long pulse, 10.000 μs), B = LP (long pulse, 700 μs), and C = SP (short pulse, 350 μs). Nd:YAG laser (λ = 1.064 μm) was applied at contact mode (10 Hz, 0.8 W, 80 mJ) and energy density of 0.637 mJ/mm(2). Analysis of variance (ANOVA) was performed for the statistical analysis (P = 0.46). Nd:YAG laser pulse duration provided no difference on the temperature changes on primary enamel, in which the following means were observed: A = EL (23.15°C ± 7.75), B = LP (27.33°C ± 11.32), and C = SP (26.91°C ± 12.85). It can be concluded that the duration of the laser pulse Nd:YAG increased the temperature of the primary enamel but was not influenced by different pulse durations used in the irradiation.

No MeSH data available.


Schematic design of the employed methodology. (a) Primary molar; (b) section machine and sectioned tooth; (c) specimens (3.5 × 3.5 × 2.0 mm); (d) polisher; (e) fixation of specimens at acrylic plates, delimitation of irradiated area with insulating tape (4.0 mm2), and irradiation with Nd:YAG laser; (f) holes to accommodate thermal-sensors (0.1 mm depth); (g) acquisition plate; (h) system connected to the computer.
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fig1: Schematic design of the employed methodology. (a) Primary molar; (b) section machine and sectioned tooth; (c) specimens (3.5 × 3.5 × 2.0 mm); (d) polisher; (e) fixation of specimens at acrylic plates, delimitation of irradiated area with insulating tape (4.0 mm2), and irradiation with Nd:YAG laser; (f) holes to accommodate thermal-sensors (0.1 mm depth); (g) acquisition plate; (h) system connected to the computer.

Mentions: For each specimen, the temperature (°C) was registered from the first laser pulse emitted by the Nd:YAG laser and repeated every 0.3 seconds, for 30 seconds using the K-type thermocouples adapted to the dentin surface 1 mm, under irradiated surface, and all measurements were performed in a temperature/humidity-controlled room. Figure 1 represents the schematic design of the employed methodology.


Influence of the Nd:YAG laser pulse duration on the temperature of primary enamel.

Valério RA, da Cunha VS, Galo R, de Lima FA, Bachmann L, Corona SA, Borsatto MC - ScientificWorldJournal (2015)

Schematic design of the employed methodology. (a) Primary molar; (b) section machine and sectioned tooth; (c) specimens (3.5 × 3.5 × 2.0 mm); (d) polisher; (e) fixation of specimens at acrylic plates, delimitation of irradiated area with insulating tape (4.0 mm2), and irradiation with Nd:YAG laser; (f) holes to accommodate thermal-sensors (0.1 mm depth); (g) acquisition plate; (h) system connected to the computer.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4385661&req=5

fig1: Schematic design of the employed methodology. (a) Primary molar; (b) section machine and sectioned tooth; (c) specimens (3.5 × 3.5 × 2.0 mm); (d) polisher; (e) fixation of specimens at acrylic plates, delimitation of irradiated area with insulating tape (4.0 mm2), and irradiation with Nd:YAG laser; (f) holes to accommodate thermal-sensors (0.1 mm depth); (g) acquisition plate; (h) system connected to the computer.
Mentions: For each specimen, the temperature (°C) was registered from the first laser pulse emitted by the Nd:YAG laser and repeated every 0.3 seconds, for 30 seconds using the K-type thermocouples adapted to the dentin surface 1 mm, under irradiated surface, and all measurements were performed in a temperature/humidity-controlled room. Figure 1 represents the schematic design of the employed methodology.

Bottom Line: Fifteen sound primary molars were sectioned mesiodistally, resulting in 30 specimens (3.5 × 3.5 × 2.0 mm).Nd:YAG laser pulse duration provided no difference on the temperature changes on primary enamel, in which the following means were observed: A = EL (23.15°C ± 7.75), B = LP (27.33°C ± 11.32), and C = SP (26.91°C ± 12.85).It can be concluded that the duration of the laser pulse Nd:YAG increased the temperature of the primary enamel but was not influenced by different pulse durations used in the irradiation.

View Article: PubMed Central - PubMed

Affiliation: Clinical Pediatric Dentistry Department, Ribeirão Preto School of Dentistry, São Paulo University, Café Avenue, Monte Alegre, 14040-904 Ribeirão Preto, SP, Brazil.

ABSTRACT
The aim of this study is to evaluate the temperature change on specimens of primary enamel irradiated with different pulse duration of Nd:YAG laser. Fifteen sound primary molars were sectioned mesiodistally, resulting in 30 specimens (3.5 × 3.5 × 2.0 mm). Two small holes were made on the dentin surface in which K-type thermocouples were installed to evaluate thermal changes. Specimens were randomly assigned in 3 groups (n = 10): A = EL (extra long pulse, 10.000 μs), B = LP (long pulse, 700 μs), and C = SP (short pulse, 350 μs). Nd:YAG laser (λ = 1.064 μm) was applied at contact mode (10 Hz, 0.8 W, 80 mJ) and energy density of 0.637 mJ/mm(2). Analysis of variance (ANOVA) was performed for the statistical analysis (P = 0.46). Nd:YAG laser pulse duration provided no difference on the temperature changes on primary enamel, in which the following means were observed: A = EL (23.15°C ± 7.75), B = LP (27.33°C ± 11.32), and C = SP (26.91°C ± 12.85). It can be concluded that the duration of the laser pulse Nd:YAG increased the temperature of the primary enamel but was not influenced by different pulse durations used in the irradiation.

No MeSH data available.