Various materials are used in dental laboratories for manufacturing crowns and bridges, chromium-cobalt frameworks, acrylic dentures, and other dental products. Among these, precious and non-precious alloys, porcelain, methyl methacrylate, and a variety of impression materials are the most common. The use of these materials has caused respiratory diseases, dermatological problems and neurotoxicity among dental technicians. Several cases of respi ratory disorders have been reported among the members of this profession and epidemiological studies have shown a high prevalence of pneumoconiosis related to duration of exposure. Since exposure is not limited to one substance, combined exposure to several contaminants may be responsible for the pneu moconiosis. The number of environmental investigations is limited and in many cases available studies do not provide adequate information about exposure of dental technicians to airborne contaminants. Further investiga tion is required in dental laboratories to characterise the type and level of contamination. Adequate and efficient protection should be considered for this profession to prevent occupationally related disorders.
Craig RG: Restorative Dental Materials, ed 8. St Louis, Mosby Year Book, 1993, pp 120-145.
3.
Craig RG, O'Brien WJ, Powers JM: Dental Materials, Properties and Manipulation, ed 5. St Louis, Mosby Year Book, 1992, pp 236-253.
4.
World Health Organization, IARC monograph on the evaluation of carcinogenic risks to humans: Overall Evaluation of Carcinogenicity: An Updating of IARC Monograph, vol 1-42. Lyon, International Agency for Research on Cancer, 1987, pp 165-269.
5.
American Conference of Governmental Industrial Hygienists: Documentation of TLV, BEL, ed 6. Cincinnati, ACGIH, 1994 , pp 312-315.
6.
Zenz C., Dickerson OB, Horvath EP: Occupational Medicine, ed 3. St Louis, Mosby Year Book,1994,453-616.
7.
Stokinger HE : The Metals: Patty's Industrial Hygiene and Toxicology. New York, Wiley, vol 2A, 1981, pp 1493-1871.
8.
Vuyst Pde, Vande Weyer R, Coster AD, Marchandise FX, Dumortier P., Ketelbant P., Jedwab J., Yernault C.: Dental technicians pneumoconiosis: A report of two cases. Am Rev Respir Dis1986;133:316-320.
9.
Sherson D., Maltbaek N., Heydorn K.: A dental technician with pulmonary fibrosis: A case of chromium-cobalt alloy pneumoconiosis. Eur RespirJ1990;3:1227-1229.
Kotloff RM, Richman PS, Greenacre JK, Ross-man MD: Chronic beryllium disease in a dental laboratory technician. Am Rev Respir Dis1993;147:205-207.
12.
American Conference of Governmental Industrial Hygienists: Documentation of TLV and BEL. Cincinnati, ACGIH, 1991, pp 1070-1074.
13.
Sax NI: Dangerous Properties of Industrial Materials, ed 6. New York, Van NostrandRein-hold, 1984, p 2113.
14.
American Conference of Governmental Industrial Hygienists: Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices. Cincinnati , ACGIH, 1997.
15.
Craig RG: Restorative Dental Materials, ed 9. St Louis, Mosby Year Book, 1993, pp 231-245.
16.
Niosh/Osha: Occupational health guideline for methyl methacrylate. Occupational health guideline for hazardous chemicals. NIOSH, 1992, pp 1-5.
17.
Seiji K., Inove O., Kawai T., Mizunuma K., Yasugi T., Moon CS, Takeda S., Ikeda M.: Absence of mutagenicity in peripheral lymphocytes of workers occupationally exposed to methyl methacrylate. IndustHealth1994;32:97-105.
18.
Seppalainen AM, Rajaniemi R.: Local neurotoxicity of methyl methacrylate monomer among dental technicians. Am J Indust Med1984;5:471-477.
19.
Rajaniemi R. : Clinical evaluation of occupational toxicity of methyl methacrylate monomer to dental technicians. J Soc Occup Med1986;36:56-59.
20.
Reynaud-Gaubert M., Philip-Joet F., Arnaud A.: Asthme professionnel au méthyl-méthacrylate . Presse Méd1991;20:386.
21.
Lozewicz S. , Davison AG, Hopkirk A., Sherwood Burge P., Boldy D., Riordan JR, McGivem DV, Platts BW, Davies D., Newman Taylor AJ: Occupational asthma due to methyl methacrylate and cyanoacrylate. Thorax1984;39: 712-713.
22.
World Health Organization, IARC Monograph on the Evaluation of Carcinogenic Risks to Humans: Lyon , International Agency for Research on Cancer, 1979, vol 19, pp 187-195.
23.
Brune D., Beltesbrekke H.: Level of methyl methacrylate, formaldehyde, and asbestos in dental workroom air. Scand J Dent Res1981;89: 113-116.
Loewan GM, David Weiner Do, McMahan J: Pneumoconiosis in an elderly dentist. Chest1988;93:1312-1313.
26.
Choudat D., Gaudichet A., Brochard P., Vallentin F., Berriau T., Philbert M., Bignon J., Proteau J.: L'exposition aux poussières de chrome chez des prothésistes dentaires . Arch Mal Prof1985; 46:318-320.
27.
Lob M., Hugonnaud C.: Risques de pneumoconiose par métal dur et de bérylliose chez les techniciens-dentistes lors de l'usinage de prothèses métalliques. Arch Mal Prof1977;38: 543-549.
28.
Brune D., Beltesbrekke H.: Dust in dental laboratories: Part I: Type and levels in specific operations . J Prosthet Dent1980;43:678-692.
29.
Leghissa P. , Ferrari MT, Piazzolla S., Caironi M., Parigi PC, Lebbolo E.: Cobalt exposure evaluation in dental prostheses production. Sci Total Environ1994;150:253-257.
30.
Moffa JP, Guckes AD, Okawa MT, Lilly GE: An evaluation of non-precious alloys for use with porcelain veneers: Part II: Industrial safety and biocompatibility. J Prosthet Dent1973; 30:432-441.
31.
Hinman RW, Lynde TA, Pelleu GB, Gaugler RW: Factors affecting beryllium concentration in dental spaces. J Prosthet Dent1975 ;32:210-215.
32.
Rom WN, Lockey JE, Lee JS, Kimball C., Bang K., Leaman H., Johns RE, Rerrota D., Gibbons HL: Pneumoconiosis and exposure of dental laboratory technicians. Am J Public Health1984;74:1252-1256.
33.
Purt R.: Palladium ceramic alloys: Possible health hazards. QuintessenceDent Technol1987;11:35-41.
34.
Brune D., Beltesbrekke H., Strand G.: Dust in dental laboratories. Part II: Measurement of particle size distribution . J Prosthet Dent1980; 44:82-87.
35.
Pagniano, R. , Scheid R., Kos D.: Methyl methacrylate vapour in pre-clinical dental laboratory: JDent1986;65:319.
36.
Sherson D., Maltbaek N., Olsen O.: Small opacities among dental laboratory technicians in Copenhagen . Br J Ind Med1988;45:320-324.
37.
Choudat D., Triem S., Weill B., Vicrey C., Ameille J., Brochard P., Letourneux M., Rossignol C.: Respiratory symptoms, lung function, and pneumoconiosis among self employed dental technicians. Br J Ind Med1993;50:443-449.
38.
Seldén AI, Persson B., Bornberger-Dankvardt Si, Winstron LE, Bodin LS: Exposure to cobalt chromium dust and lung disorders in dental technicians . Thorax1995;50:769-722.
39.
Marez T., Edmé JL, Boulenguez C., Shirali P., Haguenoer JM: Bronchial symptoms and respiratory function in workers exposed to methyl methacrylate . Br J Ind Med1993;50:894-897.
40.
Jacobsen N. , Petterson AN: Self-reported occupation-related health complaints among dental laboratory technicians. Quintessence Int1993; 24:409-415.
41.
Rajaniemi R. , Tola S.: Subjective symptoms among dental technicians exposed to the monomer methyl methacrylate. Scand J Work Environ Health1985;11:281-286.
