Chapko MK. A study of the intentional use of pit and fissure sealants over carious lesions. J Public Health Dent. 1987 Summer;47(3):139-42.
Chapko MK. A study of the intentional use of pit and fissure sealants over carious lesions. J Public Health Dent. 1987 Summer;47(3):139-42.