Evaluation of the adhesive strength in dentin after irradiation with Ti:Sapphire ultrashort laser pulses
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2019
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SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE
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This study was done to evaluate whether the
irradiation of dentine with ultrashort laser pulses prior to
adhesive procedures contributes to increase the adhesive
resistance to microtraction essays. Twenty-four human teeth
(third molars) were used, divided into 4 groups (n=6): standard
adhesive procedures with etch-rinse adhesive were used in the
control group, and in the experimental groups, the dentin was
irradiated by 25 fs pulses prior to the adhesive procedures, with
varying fluences. One tooth from each group was used to
evaluate its surface roughness. After 24h, the teeth were
sectioned with perpendicular cuts, producing toothpicks that
were submitted to the microtraction test. The results showed
that the groups irradiated with fluences under 4 J/cm² presented
similar results among themselves, comparable to the control
group, while the group irradiated with 8 J/cm² showed lower
adhesive strength. We propose that the adhesive strength and
surface roughness reduction resulting from the fluence increase
is probably related to the shielding arising from an electron
plasma formation during the ablation, decreasing the material
removal efficiency. Nevertheless, the lower energy densities did
not affect the adhesiveness, maintaining values similar to the
control.
Como referenciar
PENHA JUNIOR, TARCISO; RODRIGUES, MONICA de A.P.; ZEZELL, DENISE M.; VIEIRA JUNIOR, NILSON D.; SAMAD, RICARDO E.; DUTRA-CORREA, MARISTELA. Evaluation of the adhesive strength in dentin after irradiation with Ti:Sapphire ultrashort laser pulses. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 7-9, 2019, São Paulo, SP. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/30297. Acesso em: 17 Apr 2024.
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