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Gross-β Level in Dental Ceramic Materials

치과용 세라믹 재료의 전β 방사능 준위

  • Kim, Sung-Hwan (Department of Radiological Science, Cheongju University) ;
  • Jeong, Hyun-Ja (Department of Dental Hygene, Daegu Health College)
  • 김성환 (청주대학교 방사선학과) ;
  • 정현자 (대구보건대학 치위생과)
  • Received : 2010.11.08
  • Accepted : 2010.12.17
  • Published : 2010.12.31

Abstract

In all of dental ceramics, these materials contained the radio-isotopes with natural abundance ratio. After dental treatment, remained dental ceramics in the oral cavity is caused for human internal dose. In this study, the gross beta activity levels were measured in dental materials including 22 dental ceramics, 1 resin, and 2 cements for estimation of human internal dose. In dental ceramic samples, the obtained results showed that the gross beta activity level varied between 1.317 ~ 2.935 Bq/g and the gross beta activity level was 2.379 Bq/g. And the same level for dentine, opacious dentine, translucent and enamel were 2.479 Bq/g, 2.491 Bq/g, 2.470 Bq/g and 2.069 Bq/g, respectively. The gross beta activity level of temporary resin and cements were negligible, compare to the same level of dental ceramics. The high gross beta activity level observed in opacious dentine code OD-A4 is 2.935 Bq/g thus mainly ascribable to 40K. The reduction of the radiation level of natural radio-isotopes and the improvement of the dental ceramic materials should be required for internal dose reduction.

Keywords

Gross-$\beta$;Radioactivity;Dental ceramic

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