Document Nkn3LMq518egz0nwpkdLoqRV

FILE NAME Dental Asbestos DEN DATE 1976 Apr DOC DEN101 DOCUMENT DESCRIPTION Journal Article - Hazards of Asbestos in Dentistry Hazards of asbestos in dentistry Council on Dental Therapeutics Council on Dental Materials and Devices e pawe n tepeeeerseess Asbestos is chiefly used in dentistry as a binder in periodontal dressings and as a lining material for casting rings and crucibles Asbestos is a large amounts are being prepared in poorly ventilated areas and when the powder is shaken prior to mixing Also exposure to airborne generic term for a number of hydrated silicate fibers may occur in dental laboratories where minerals which under crushing or other pro- asbestos is used to line casting rings or crucibles cessing procedures separate into flexible fibers for casting machines and in general is kept in the There are many such minerals including chrys- laboratory in large rolls Here the danger lies otile asmosite crocidolite anthophyllite tre- in the tendency for personnel to carelessly cut molite and actinolite Most asbestos is classi- sections off these rolls and thus release asbestos fied as chrysotile and it appears to be the most hazardous fiber in the group into the ambient air The maximum permissible exposure of an employee to airborne concen- It has been documented that airborne asbes- trations of asbestos fibers over an hour tos is related causally to the development of pul- weighted average has been established as monary asbestosis and fibrosis lung cancer five fibers longer than 5...mper cubic centi- Ard and pleural and peritoneal mesotheliomas meter of air On July 1 1976 the maximum will Recent epidemiologic studies also have indicat- be reduced to two such fibers per cubic centi- a ed that the chance of lung cancer developing in meter of air This is of importance to the dentist rr smokers exposed to airborne asbestos is greater than it is in nonsmokers 10-12 operating his own laboratory as well as to the employees in commercial dental laboratories The potential danger to dental personnel in To prevent release of fibers into the air asbestos fo. preparation of containing periodontal should be handled applied removed cut or ms aewie packs is of sufficient concern that the Council otherwise in a wet state to reduce the on Dental Therapeutics will no longer consider emission of airborne asbestos Personnel should such products as eligible for its Acceptance Pro- be aware that soaking of asbestos liners in water To gram Airborne asbestos may become hazard- . releases fibers into the community sewage line we ous during the mixing of these asbestos and therefore suitable trapping of such wastes hie taining periodontal dressings particularly when is recommended 2s, a REPORTS OF COUNCILS AND BUREAUS I JADA Vol 92 April 1976 = 777 ae 3: rd Kerr 0000051 There is no apparent health danger from inhalation to patients for whom asbestos ing periodontal dressings are used since the fibers cannot be appreciably released from the dressings once they are mixed and applied In addition present information indicates that there is little danger to patients should the dressings be * accidentally swallowed According to the Food and Drug Administration evidence concerning the possible hazard from ingestion of asbestos particles is contradicting and inconclusive There is however evidence that parenteral administration of asbestos in animals can result in local malignancies malignant mesothelioma and dissemination of fibers in lymph nodes spleen kidneys and brain Therefore the Conncil on Dental Therapeutics is concerned about the asbestos concentration of filters used for preparing drugs that may be injected parenterally by dentists Such filters may release asbestos particles into the solution and thus be injected into the patient The Food and Drug Administration is surveying the industry for information concerning the use of such filters . 1. Cooke W.E. Fibrosis of lungs due to the inhalation of asbes- tos dust Br Med J 147 July 26 1924 2. Cooko W.E. Pulmonary 1024 1927 asbestosis Br Med J 2 Dec 3 aa 3. McDonald S. Histology of pulmonary asbestosis Br Med J 1025 Dec 3 1827 4. Doll A. Mortality from lung cancer in asbestos workers BrJ Industr Mcd 12:81 April 1955 5. Cordova JF Tesluk M and Knudtson K.P. Asbestosis and carcinoma of the lung Cancer 1181 Dec 1962 6. Sellkoff .J Churg .; and Hammond E.C. Asbestos exposure and neoplasia JAMA 166 April 6 1964 7. Hammond E.C Selikoff IJ and Churg J. Neoplasia among insulation workers in the United States with special reterence to intraabdominal neoplasia Ann NY Acad Sci 519 Dec 31 1955 8. Lieben J. and Pistawka H. Mesothelioma and asbestos exposure Arch Environ Health 559 April 1967 9. Owen W.G. Mesothelial tumors and exposure to aabesIOS dust Ann NY Acad Sci 132-674 Dec 31 1965 10. Warnock M.L. and Churg A.M. Association of asbestos and bronchogenic carcinoma in a population with low asbestos exposure Cancer 1296 April 1975 11 Berry G Newhouse M.L and Turok M.Combined effect of asbestos exposure and smoking on mortality from lung cancer in factory workers Lancet 476 Sept 2 1972 , 12. Sellkolt LJ Hammond E.C and Churg J. Asbestos expo- sure smoking and neoplasia JAMA 204 April 1968 13. Otterson E.J. and Arra M.C. Potential hazards of asbestos in periodontal pact J Wis Dent Assoc 435 Nov 1974 14. Dyer M.R. The possible adverse effects of asbestos in gingivectomy packs Br Dent J 122 June 6 1967 15. Federal Register 23543 June 27 1974 16. Federal Register 27076 Sept 26 1973 17. Harington J.S. Roe F.J. Studies of carcinogenesis of asbestos fibers and their natural fibers Ann NY Acad Sci 132 439 1965 16. Roe F.J. and others The pathological affects of subcutaneous injections of asbestos fibres in mice migration of fibres to submesothelial tissues and induction of mesotheliomata Ini J Cancer 628 Nov 15. 1967 19. Kanazawa K. and others Migration of asbestos fibres from subcutaneous injection sites in mice Br J Cancer 24:96 March 1970 wee te 778 REPORTS OF COUNCILS AND BUREAUS / JADA Vol 92 April 1976 ? Kerr 0000052