歯科用アルギン酸印象材中の鉛量について

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  • On the Amount of Lead Contained in the Alginate Impression Material in Dentistry
  • シカヨウ アルギンサン インショウザイチュウ ノ ナマリ リョウ ニ ツイテ

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The present study was concerned with the measurement of lead contained in a dental alginate impression material. The lead is included in the impression material for the purpose of enhancing its surface smoothness, ease of manipulation and higher viscosisity.<BR>For measuring the lead, use was made of an atomic extinction meter and, at the same time, the number of air-borne particles at the time of trituration were measured with a Royco 202 particle counter. The weight of the material was meosured before and after and after trituration, and the difference between the two was used to indicate the number of air-borne lead particles.<BR>As a result, the following findings were obtained:<BR>1. With the exception of one product (domestic), the usual amount of lead was 5-35μg/g. Two paste-like products (domestic) were found to contain the least amount, 7μg/g.<BR>The four foreign products (U.S.A.), on the other hand, containnd an average amount of 16.2μg/g. The three domestic products had an average value of 26.2μg/g, one of them containing as much as 9.7μg/g.<BR>2. In terms of the size of air-borne lead particles at trituration, there was no product ir. which the size was less than 0.6μ.<BR>The number of air-borne particles was anywhere from 14.7×103 to 44.9×103 pieces/1.<BR>The products in which the particles were less than 0.8-10.0μ accounted for 52.9-72.7% whereas in the rest the particles were more than 10.0μ.<BR>3. The weight of air-borne lead particles at trituration was 146.13-343.12mg for one-time use, which accounted for 0.81-1.55% of the total under examination. The amount of lead contained in these particles was anywhere from 5.11 to 8.23μg.<BR>Care should be taken in the use of alginate impression material in a clinical environment.

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