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To investigate dental erosion in employees working with sulfuric acid at a lead storage battery manufacturing plant and level of personal exposure to sulfuric ions, we measured sulfuric ion concentrations in the mouth rinse of those employees. We also measured exposure levels from air samples obtained from 2 employees from the same plant who did not work with sulfuric acid using a portable air sampler. At the same time, we collected and compared their mouth rinses with those from other employees. More specifically, we measured and compared sulfuric ion, calcium, and magnesium concentrations, along with pH levels from the mouth rinse of these two groups. Positive correlations were found between sulfuric ion and calcium concentrations (r=0.61, p&lt;0.005), calcium and magnesium concentrations (r=0.61, p&lt;0.005), Ca/Mg and calcium concentrations (r=0.64, p&lt;0.005), and sulfuric ion and magnesium concentrations (r=0.55, p&lt;0.005). Negative correlations were found between sulfuric ion concentrations and pH levels (r=-0.31, p&lt;0.01), and magnesium concentrations and pH levels (r=-0.32, p&lt;0.01). This suggests that mouth rinse from employees working with sulfuric acid could function as an indicator of sulfuric ion concentration in the work environment. Furthermore, this could lead to the development of a more accurate indicator of individual exposure.

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Dental Erosion and Sulfuric Ion Exposure Levels in Individuals Working with Sulfuric Acid in Lead Storage Battery Manufacturing Plant Measured with Mouth-rinse Index