TABLE 3.

Comparison of the production of sialidase, β-galactosidase, and N-acetyl-β-glucosaminidase by the total microbiota and A. naeslundii recovered from demineralized dentine sampled from enamel caries lesions (initial sample) and following removal of the restoration (final sample)

Enzyme activity	% of flora positive		% of A. naeslundii isolates positive
	Initial sample (n = 4,148)	Final sample (n = 518)	Initial sample (n = 360)	Final sample (n = 377)
Sialidase	18.0	100	59.0	100
β-Galactosidase	62.3	100	6.2	100
N-Acetyl-β-glucos- aminidase	42.2	98.8	6.2	100