Polychlorinated biphenyls cause developmental enamel defects in children.

Area of Science:

• Environmental Health
• Pediatric Dentistry
• Toxicology

Background:

• Polychlorinated biphenyls (PCBs) are persistent organic pollutants with known adverse health effects.
• Developing dental enamel is a sensitive indicator of environmental exposures during childhood.

Purpose of the Study:

• To investigate the association between long-term polychlorinated biphenyl (PCB) exposure and developmental defects of enamel in children.
• To assess the prevalence and extent of enamel defects in children exposed to PCBs compared to a control group.

Main Methods:

• A case-control study involving 202 children pre- and post-natally exposed to PCBs and 202 matched controls.
• Dietary risk assessment for toxic PCB congeners and validation of exposure through PCB levels in dentine.
• Analysis of PCB levels using high-resolution gas chromatography and assessment of enamel defects using the FDI Index.

Main Results:

• 71.3% of PCB-exposed children exhibited developmental defects of enamel in permanent teeth, versus 49.5% in controls.
• Abnormal enamel was observed in 21.9% of permanent index teeth in the exposed group, compared to 12.7% in controls.
• Statistically significant increases in demarcated opacities and hypoplasia were noted in exposed children, with no significant findings in deciduous teeth.

Conclusions:

• Long-term exposure to polychlorinated biphenyls (PCBs) is associated with an increased risk of developmental defects in permanent dental enamel.
• The findings suggest PCBs act as a significant etiological factor for enamel abnormalities, particularly opacities and hypoplasia.
• Deciduous teeth did not show a significant correlation, indicating a potential developmental window for PCB impact on enamel formation.