Efeitos da irradiacao com laser de diodo em dentes de ratos reimplantados tardiamente: analise histometrica / Effects of diode laser irradiation in delayed replanted rat teeth: histometric analysis

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

23/08/2010

RESUMO

Aim: The aim of this study was to evaluate by histometric analysis, the effects of high potency diode laser irradiation in root surfaces of delayed replanted rat teeth. Methods: Sixty Wistar rats were extracted and left on the bench for sixty minutes. Thereafter, the dental papilla was sectioned for pulp removal by a retrograde way, the root canal was prepared and filled with calcium hydroxide paste (CalenÂ). According to the root surface treatment before the replantation, the teeth were assigned to four groups(n=15): G1 (negative control) â no root surface treatment; G2 (positive control)- treated with 2% sodium fluoride solution; G3- irradiated with high potency diode laser(810nm), continuous mode, optic fiber 600μm, 1.5W input, 30s) and G4- - irradiated with high potency diode laser in the same parameters of G3, but in pulsed mode. The rats were killed by anesthetic overdose 15, thirty and sixty days after replantation and the specimens were processed in laboratory for histometric analysis. It was calculated the mean (%) of the root resorption areas for each group. Results: In all experimental periods, the root resorption percentage mean was in decreasing order: G1>G2>G4>G3.The diode laser irradiated groups (G3 and G4) presented the least means and there was no statistical difference between them. Replacement resorption and ankylosis were observed only at periods of thirty and sixty days, but in G3 such events were not observed. Conclusions: The root surface treatment with high potency diode laser irradiation before delayed replantation, in the parameters used in this study, reduced external root resorption prevalence. In continuous mode, it inhibited replacement resorption and ankylosis emergence

ASSUNTO(S)

endodontia laser de diodo reimplante dentario reabsorcao radicular endodontia diode laser tooth replantation root resorption endodontics

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