Clinical trial NCT05094076: Effect of Phosphate Exposure on Workers Health
Official title: Effect of Phosphate Exposure on Workers Respiratory and Oral Health in Phosphate Mine at Safaga
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Work-related Illness
Lead sponsor: Assiut University
Sponsor class: OTHER
First posted: 2021-10-26
Enrollment: 100
Sex: MALE
Minimum age (years): 25
Maximum age (years): 60
Standard ages: ADULT
Accepts healthy volunteers: yes
Observational model: OTHER
Time perspective: CROSS_SECTIONAL
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Active working miners working in phosphate mines with minimum exposure 5 year.

Brief summary: To minimize negative health effects on health of workers in phosphate mining, it is important to assess, and diagnose health related effect of phosphate exposure \& health hazards related to miners. Early reporting, diagnosis, and intervention can limit the severity of health hazards, improve the health services. To our knowledge no local previous studies were done in this area.

Detailed description: Mining continues to be a dangerous activity, whether large-scale industrial mining or small-scale artisanal mining. Not only are there accidents, but exposure to dust and toxins, along with stress from the working environment or managerial pressures, give rise to a range of diseases that affect miners. Beneficiation is the process of removing the unnecessary minerals, which is used to increase the grade of mining product (concentrate). Phosphate ores can be beneficiated using one or a combination of different methods. The most common ones are: flotation, crushing, desliming, separation, grinding and washing thus keeping workers in Phosphate mines employ exposed to respirable dust pollution and to high silica dust levels presented in silicosis in many job areas, Silicosis is the most common occupational lung disease in Egypt where its prevalence rate ranges from 18.5 % to 45.8% among workers exposed to free crystalline silica dust. Despite its high prevalence, there is a lack of enforcement of exposure limits, availability and use of personal protective equipment, and occupational health education programs .

In Egyptian phosphate miners' study (2011), The study involved of three groups: 50 silica-exposed workers with radiological evidence of silicosis, 50 silica-exposed workers without evidence of silicosis, and 50 healthy unexposed subjects. , There were significant differences between pulmonary function parameters, values of C-reactive protein, rheumatoid factor, complement component C3, IgA, IgG, and IgM in exposed groups with and without silicosis, and healthy unexposed control subjects (p\<.001).

Exposure to acid fumes in the phosphate mining was significantly associated with dental erosion and deteriorated oral health status, As working in phosphate mines had 8 and 28 times the risk for developing respectively oral lesions and teeth abrasions. This supported by Tunisian 2017 on 37 workers\& 37 controls, found that frequencies of fluorosis, teeth abrasion, and oral lesions were significantly higher among the exposed group.

Eligibility criteria: Inclusion Criteria:

* Active working miners working in phosphate mines with minimum exposure 5 year.
* Had free pre-employment records.

Exclusion Criteria:

* Workers don't record phosphate exposure as in administration department.
* Workers with less than 5-year exposure
* Workers known to had autoimmune disorder before joining job.

Primary outcomes:
measure: pneumoconiosis or not
timeFrame: through study completion, an average of 1 year
Secondary outcomes:
measure: dental caries
timeFrame: through study completion, an average of 1 year
Other outcomes:
Locations:
Study officials:
References:
citation: Stewart AG. Mining is bad for health: a voyage of discovery. Environ Geochem Health. 2020 Apr;42(4):1153-1165. doi: 10.1007/s10653-019-00367-7. Epub 2019 Jul 9.
citation: Khelifi M, Zarrouk A, Nury T, Hamed H, Saguem S, Salah RB, Riedinger JM, Lizard G. Cytokine and eicosanoid profiles of phosphate mine workers. J Toxicol Sci. 2014 Jun;39(3):465-74. doi: 10.2131/jts.39.465.
citation: Kalliny MS, Bassyouni MI. Immune response due to silica exposure in Egyptian phosphate mines. J Health Care Poor Underserved. 2011;22(4 Suppl):91-109. doi: 10.1353/hpu.2011.0156.
citation: Amin WM, Al-Omoush SA, Hattab FN. Oral health status of workers exposed to acid fumes in phosphate and battery industries in Jordan. Int Dent J. 2001 Jun;51(3):169-74. doi: 10.1002/j.1875-595x.2001.tb00835.x.