title: Influence of the Nd:YAG laser pulse duration on the temperature of primary enamel.
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.
authors: Clinical Pediatric Dentistry Department, Ribeirão Preto School of Dentistry, São Paulo University, Café Avenue, Monte Alegre, 14040-904 Ribeirão Preto, SP, Brazil.
authors: R A
authors: RA
authors: Valério
authors: Clinical Pediatric Dentistry Department, Ribeirão Preto School of Dentistry, São Paulo University, Café Avenue, Monte Alegre, 14040-904 Ribeirão Preto, SP, Brazil.
authors: V S
authors: VS
authors: da Cunha
authors: Clinical Pediatric Dentistry Department, Ribeirão Preto School of Dentistry, São Paulo University, Café Avenue, Monte Alegre, 14040-904 Ribeirão Preto, SP, Brazil.
authors: R
authors: R
authors: Galo
authors: Physics Department, School of Philosophy, Science and Literature, São Paulo University, 3900 Bandeirantes Avenue, 14040-901 Ribeirão Preto, SP, Brazil.
authors: F A
authors: FA
authors: de Lima
authors: Physics Department, School of Philosophy, Science and Literature, São Paulo University, 3900 Bandeirantes Avenue, 14040-901 Ribeirão Preto, SP, Brazil.
authors: L
authors: L
authors: Bachmann
authors: Restorative Dentistry Department, Ribeirão Preto School of Dentistry, São Paulo University, Café Avenue, Monte Alegre, 14040-904 Ribeirão Preto, SP, Brazil.
authors: S A M
authors: SA
authors: Corona
authors: Clinical Pediatric Dentistry Department, Ribeirão Preto School of Dentistry, São Paulo University, Café Avenue, Monte Alegre, 14040-904 Ribeirão Preto, SP, Brazil.
authors: M C
authors: MC
authors: Borsatto
mesh_terms: D003743:Dental Enamel / Q000502:physiology*; D006801:Humans; D053844:Lasers, Solid-State / Q000592:standards; D013696:Temperature; D013997:Time Factors