殺菌灯の歯科領域の利用価値に対する実験的研究
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概要
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1) In vitro experiment in our laboratory of bactericidal effect of the commercial quarz lamp for bacteriological laboratory and of the small type light therapy apparatus known as Dental Spot lamp, on several varieties of germs including staphylococcal and coli form bacilli has shown some utility in a limited sense. However, the time required of these apparatus in effecting complete sterilization was not always in agreement with that reported by other investigators. 2) In the experiment using Dental Spot Lamp on the root canal which was enlarged to the extent of No.6 reamer to permit as much passage of the rays as possible, it was revealed that the rays passed through the canal effectively only when it was relatively straight, and not when it was crooked where the rays failed to reach at the apical foramen of the root. 3) In the experiment where the infected root canal of an extracted tooth was enlarged to the extent of No.6 reamer to be exposed to the rays directly from above for 5 minutes, bacterial colonies were seen to develop by the root canal culture on the medium containing thioglycolate. 4) It was observed in rabbits that although temporary disappearance of bacteria from mucous membrane of the hare lip was brought about by the radiation, the number of bacteria recoverable from the site 3 hours after the radiation became rather increased than before. 5) Administration of the rays for 60 seconds on the pinna and the local skin of healthy rabbits brought about reddening of the sites which developed into extended inflammation with continued daily application of the radiation. 6) Inflammatory reaction of cut wound or of the local skin at which subcutaneous injection of staphylococcal cell suspension was given, became more aggravated by 60 second dosage of radiation for 4 days, and further the healing process of these lesions was no more accelerated than the one of non-radiated control, and even was retarded in some instance. It may be concluded from these experiments that although the small type apparatus for ultraviolet radiation can be used as effective sterilizer in vitro, its use in vivo at local sites such as root canals has only very little effect for disinfection, and besides that, it must be kept in mind that its administration may sometimes cuse undesirable inflammatory reaction on the local tissues involved. In the clinical application of this apparatus, one should be careful to select proper indication, proper dosage and proper technic of administration, taking in consideration the specific quality of the ultraviolet rays as well as the photo-regeneration of bacteria.
- 九州歯科学会の論文
- 1960-05-31
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