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Stimulatory Effects of CO(2) Laser, Er:YAG Laser and Ga-Al-As Laser on Exposed Dentinal Tubule Orifices.

Matsui S, Kozuka M, Takayama J, Ueda K, Nakamura H, Ito K, Kimura M, Miura H, Tsujimoto Y, Kondoh T, Ikemi T, Matsushima K - J Clin Biochem Nutr (2008)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Department of Clinical Oral Physiology, Nihon University School of Dentistry at Matsudo, 870-1, Sakaecho, Nishi-2, Matsudo, Chiba 271-8587, Japan.

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.

No MeSH data available.


Dye penetration test. D: dentin side, P: pulp side. a: control group, b: CO2 laser group, c: Er:YAG laser group, d: Ga-Al-As laser group. The control group consistently displayed dye penetration test into the pulp chamber (Fig. 2). The Er:YAG laser group and the Ga-Al-As laser group display slight dye penetration into the pulp chamber (c, d), while dye penetration into the dentin side tubules is observed in the CO2 laser group (b).
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Figure 2: Dye penetration test. D: dentin side, P: pulp side. a: control group, b: CO2 laser group, c: Er:YAG laser group, d: Ga-Al-As laser group. The control group consistently displayed dye penetration test into the pulp chamber (Fig. 2). The Er:YAG laser group and the Ga-Al-As laser group display slight dye penetration into the pulp chamber (c, d), while dye penetration into the dentin side tubules is observed in the CO2 laser group (b).

Mentions: The control group consistently displayed dye penetration into the pulp chamber (Fig. 2a). The Er:YAG laser group and the Ga-Al-As laser group exhibited slight dye penetration into the pulp chamber (Fig. 2c, d). In the CO2 laser group, dye penetration into the dentin side tubules was observed (Fig. 2b).


Stimulatory Effects of CO(2) Laser, Er:YAG Laser and Ga-Al-As Laser on Exposed Dentinal Tubule Orifices.

Matsui S, Kozuka M, Takayama J, Ueda K, Nakamura H, Ito K, Kimura M, Miura H, Tsujimoto Y, Kondoh T, Ikemi T, Matsushima K - J Clin Biochem Nutr (2008)

Dye penetration test. D: dentin side, P: pulp side. a: control group, b: CO2 laser group, c: Er:YAG laser group, d: Ga-Al-As laser group. The control group consistently displayed dye penetration test into the pulp chamber (Fig. 2). The Er:YAG laser group and the Ga-Al-As laser group display slight dye penetration into the pulp chamber (c, d), while dye penetration into the dentin side tubules is observed in the CO2 laser group (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2266056&req=5

Figure 2: Dye penetration test. D: dentin side, P: pulp side. a: control group, b: CO2 laser group, c: Er:YAG laser group, d: Ga-Al-As laser group. The control group consistently displayed dye penetration test into the pulp chamber (Fig. 2). The Er:YAG laser group and the Ga-Al-As laser group display slight dye penetration into the pulp chamber (c, d), while dye penetration into the dentin side tubules is observed in the CO2 laser group (b).
Mentions: The control group consistently displayed dye penetration into the pulp chamber (Fig. 2a). The Er:YAG laser group and the Ga-Al-As laser group exhibited slight dye penetration into the pulp chamber (Fig. 2c, d). In the CO2 laser group, dye penetration into the dentin side tubules was observed (Fig. 2b).

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Department of Clinical Oral Physiology, Nihon University School of Dentistry at Matsudo, 870-1, Sakaecho, Nishi-2, Matsudo, Chiba 271-8587, Japan.

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.

No MeSH data available.