title: Stimulatory Effects of CO(2) Laser, Er:YAG Laser and Ga-Al-As Laser on Exposed Dentinal Tubule Orifices.
abstract: We investigated the effects of lasers irradiation on the exposed dentinal tubule. Human tooth specimens with exposed dentinal tubule orifices were used. Three types of lasers (CO(2) laser, Er:YAG laser and Ga-Al-As laser) were employed. The parameters were 1.0 W in continuous-wave mode with an irradiation time of 30 s for the CO(2) laser, 30 mJ in continuous-wave mode with an irradiation time of 60 s for the Er:YAG laser, and 1.0 W in continuous-wave mode with an irradiation time of 60 s for the Ga-Al-As laser. A non-irradiated group was used as a control. After laser irradiation, the dentinal surface of each sample was observed using SEM. Afterwards, all samples were immersed in methylene blue dye solution in order to evaluate the penetration of the dye solution and observe the change in dentinal permeability after laser irradiation. SEM observation showed that the control group had numerous exposed dentinal tubule orifices, whereas these orifices were closed in the laser-irradiated groups. There was consistent dye penetration into the pulp chamber in the control group, whereas no dye penetration was evident in the laser-irradiated groups. Therefore, laser appears to be a promising treatment for reducing permeation through exposed dentinal tubules.
authors.affiliation: Department of Clinical Oral Physiology, Nihon University School of Dentistry at Matsudo, 870-1, Sakaecho, Nishi-2, Matsudo, Chiba 271-8587, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Matsui
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kozuka
authors.forename: Jyunichi
authors.initials: J
authors.lastname: Takayama
authors.forename: Kana
authors.initials: K
authors.lastname: Ueda
authors.forename: Hiroko
authors.initials: H
authors.lastname: Nakamura
authors.forename: Ko
authors.initials: K
authors.lastname: Ito
authors.forename: Masaru
authors.initials: M
authors.lastname: Kimura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Miura
authors.forename: Yasuhisa
authors.initials: Y
authors.lastname: Tsujimoto
authors.forename: Toshirou
authors.initials: T
authors.lastname: Kondoh
authors.forename: Takuji
authors.initials: T
authors.lastname: Ikemi
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Matsushima