| 摘要 |
The present invention relates to photo-activated disinfection. In particular , the present invention relates to photo-activated disinfection in the oral cavity. We describe a dental apparatus comprising a light source producing light at a predetermined wavelength and power, and optical transmission mean s to train the light from the light source onto at least one external side of a tooth. Preferably, the optical transmission means comprises at least one optical guide. In a preferred embodiment, the optical transmission means comprises a pair of substantially parallel elongate light guides each light guide having a distal end provided with a reflective surface inclined at 45~ to the direction of light transmission along the light guides, the reflectiv e surfaces of the light guides being opposed such that light emitted from each light guide is parallel but opposite in direction. Preferably, the light source is a light emitting diode or array of light emitting diodes and the h as a wavelength of from 550 to 690 nm, more preferably from 600nm to 680nm, eve n more preferably from 625 to 660nm.
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