{'fraction_non_alphanumeric': 0.01979604079184163, 'fraction_numerical': 0.0, 'mean_word_length': 5.390804597701149, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
[Detection and analysis of dental dust concentration in the department of prosthodontics].

PURPOSE
To detect and analyze dental dust pollution in the department of prosthodontics and propose reasonable protective measures.


METHODS
Individual dust sampling pumps were used to detect the concentration of respirable dust produced by five common dental materials (hard resin base, advanced artificial teeth, photosensitive plastic, cobalt-chromium alloy, veneering ceramics) in the department of prosthodontics. X-ray diffraction (XRD) was used to detect the concentration of free silica respirable dust in veneer porcelain dust. Inductively coupled atomic emission spectrometry (ICP-AES) was used to detect the thoracic dust of cobalt element and the inhalable dust concentration of chromium element in cobalt-chromium alloy dust. The results were compared with the occupational exposure limits set by China and the United States.


RESULTS
The respiratory dust concentration of the five common dusts in the department of prosthodontics was far lower than occupational exposure limits set by China and the United States. The concentration of free silica in veneer porcelain, cobalt and its compounds in cobalt-chromium alloys were below the lower detection limit. Chromium and its compounds can be detected, and its concentration was also far below the occupational exposure limit.


CONCLUSIONS
Problem of dust pollution in the department of prosthodontics exists, which is mainly caused by heavy metal pollution (such as chromium). Protective measures such as ventilation and wearing professional mask should be taken to protect the health of dental practitioners.