OBJECTIVETo observe the effect of the IgY solution on dental plaque and mutans Streptococci in plaque and in saliva.

METHODSA double-blind study was used. 44 school children at the third grade in test group used the IgY solution for 21 days; 41 children in control group used the placebo. The plaque index, the plaque weight, the level of mutans streptococci in saliva and in plaque were tested for all children.

RESULTSThe plaque weight in test group was (46.4 +/- 31.2) mg at baseline, and (36.6 +/- 25.6) mg at the end of the study (P = 0.007). The IgY solution reduced 21.1% plaque weight. Statistically significant differences for other indices were not shown in this study.

CONCLUSIONThe 0.1% IgY solution reduces the mass of plaque on the tooth surfaces.