Work-related accidents involving biological fluids in health care staff (HCWs) area unit among the foremost frequent and most serious accidents, which may result in the event of assorted diseases. activity exposure among these staff, additional specifically among nurses, may be attributed to many direct or indirect factors, like integral and direct care to patients, administering medication and dressing wounds, cleanup and sterilization of surgical materials and numerous instruments, excessive employment , and inappropriate conditions for concluding the work method. As we've seen, inorganic ions (Sr2 +, Al3 +, F−) area unit discharged from set resin-modified glass-ionomers, however at levels too low to possess any cytotoxic impact .  many studies have shown that HEMA is discharged by resin-modified glass-ionomers and this can be the substance that compromises the biocompatibility of those materials . HEMA discharged by absolutely set resin-modified glass-ionomers will penetrate the dentine and adversely have an effect on the pulp . It also can be distributed systemically from its location within the mouth, and may have the potential to cause harm . Dental personnel might risk a range of adverse effects from manual contact with the skin, locomote in severity from gentle to severe eczema . they're conjointly in danger from inhalation of the volatile HEMA vapour. activity infectious diseases in Choson occur principally in individuals related to industries of construction, forestry, agriculture, sanitation and similar services