Adverse reaction to a fissure sealant: report of case.

A six-year-old girl with a known allergy to mites had her first permanent molars sealed with Delton. On the night of the treatment day, she began to have asthmatic trouble. Urticaria appeared a few days later. Treatment with cortisone gave no relief. When the fissure sealant material was taken away, the asthma and urticaria disappeared. Possible explanations to the reaction are discussed in the report.