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Related Experiment Video

Updated: Feb 21, 2026

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Dental Technicians' Pneumoconiosis.

Masaki Okamoto1, Masaki Tominaga1, Shigeki Shimizu2

  • 1Division of Respirology, Neurology and Rheumatology, Department of Internal Medicine, Kurume University School of Medicine, Japan.

Internal Medicine (Tokyo, Japan)
|October 13, 2017
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Summary

A dental technician developed pneumoconiosis from inhaling metal dust during sandblasting. This first-of-its-kind case highlights occupational risks and indium exposure in dentistry.

Keywords:
dental technicianindiumpneumoconiosis

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Area of Science:

  • Occupational Medicine
  • Pulmonary Medicine
  • Toxicology

Background:

  • Dental technicians may be exposed to various metal dusts during procedures like sandblasting.
  • Previous literature has not extensively documented pneumoconiosis specifically linked to indium exposure in this profession.

Observation:

  • A 40-year-old dental technician presented with chest X-ray abnormalities, including centrilobular nodules and reduced lung volume.
  • Elevated serum KL-6 and indium levels were detected.
  • Lung biopsy revealed peribronchiolar fibrosis with pigmented macrophages and cholesterol clefts.

Findings:

  • Energy-dispersive X-ray analysis confirmed the presence of metals, including indium, in lung tissue.
  • The patient was diagnosed with pneumoconiosis attributed to occupational exposure to sandblasted dental metals containing indium.

Implications:

  • This case establishes a novel link between indium exposure in dental technicians and the development of pneumoconiosis.
  • Highlights the need for enhanced safety protocols and awareness of metal dust hazards in dental professions.
  • Suggests indium as a potential causative agent in occupational lung diseases.