Transient effects of low-energy CO2 laser irradiation on dentinal impedance: implications for treatment of hypersensitive teeth
| Autor: | J. Malcolm Carter, Mohamed I. Fayad, Charles Liebow |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Materials science
Electrolytic cell Analytical chemistry Dentistry Electrolyte law.invention Dentinal Fluid Chlorides law Dentin medicine Electric Impedance Humans Wafer Irradiation Desiccation General Dentistry Electrical impedance business.industry Lasers Carbon Dioxide Dentin Sensitivity Laser Dentin Permeability medicine.anatomical_structure Potassium business Electron Probe Microanalysis |
| Zdroj: | Journal of endodontics. 22(10) |
| ISSN: | 0099-2399 |
| Popis: | This study evaluated the effect of CO2 laser irradiation on dentinal impedance by passing known cyclic potentials across dentinal wafers mounted as a window in an electrolytic cell and measuring the resulting electrical impedance. Wafers were equilibrated in 0.1 M of KCl. The wafer specimens were irradiated with a CO2 laser (12 W, 0.1 ms, energy density 1.25 J/cm2). The time for impedance equilibration after irradiation was compared with equilibration after mounting. Mounted samples required 48 h to approach equilibrium in the electrolyte. After laser irradiation, impedance of previously equilibrated samples also required 48 h to equilibrate. This, along with exponential curve fitting, confirmed that laser treatment reintroduced a transient alteration in impedance. Equilibration time after irradiation and the mounting were similar. Dentin desociation apparently caused this transient impedance. Energy dispersive X-ray analysis confirmed the disappearance of K+Cl- after irradiation. Therefore, laser irradiation may cause dentinal desociation, yielding temporary clinical relief of dentinal hypersensitivity until rehydration occurs. |
| Databáze: | OpenAIRE |
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