In vitro thermographic measurement in pulpal chamber during diode laser bleaching
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Brazilian Dental Journal
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Thermographic was employed to determine the temperature rise
in lower incisors pulpal chambers during diode laser bleaching.
Two methods were used: a thermocouple for 72 teeth and a
infrared (IR) thermographic camera for 36. Two bleaching
agents, both 35% hydrogen peroxide- Whiteness HP (HP) and Hi
Lite (HL) - were applied to the specimens buccal surfaces and
irradiated with a diode laser (808 5nm), CW for 30s. Intensities
tested were 21.W/cm2, 29.8W/cm2, 35.8W/cm2, 38.2W/cm2,
52.9W/cm2 e 63.7W/cm2. Means of the greatest temperature
rises with the HL were statiscally lower than the HP (p<0.01).
When HP was irradiated with 50.9W/cm² and 61.1W/cm², the
temperature registered was over 5.5ºC, considered as the limit to
avoid pulp damage. The IR thermacam analysis showed that,
when the HP was used, the temperature rise in pulp chamber was
similar to the target area on the buccal surface. Evaluation of
tooth color was done using a VITAshade guide at baseline and at
the end of the bleaching treatment. Both products proved to be
efficient, however HP produced statiscally higher shade changes
than HL (p<0.01). It can be concluded that the diode laser bleaching
associated with the HP was safe when intensities below
50mW/cm2 were employed. Higher parameters can cause damage
to pulp vitality of the lower incisors, fact that did not
occurred with the HL gel. Both gels were efficacious to the
bleaching technique proposed, but the HP showed better results.
Como referenciar
GUIMARAES, J.G.A.; MIYAKAWA, W.; STOLF, S.F.; SILVA, E.M.; ZEZELL, D.M.; EDUARDO, C.P. In vitro thermographic measurement in pulpal chamber during diode laser bleaching. Brazilian Dental Journal, v. 15, p. 94-94, 2004. Special issue. Disponível em: http://repositorio.ipen.br/handle/123456789/32742. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.