Penetration of smeared or nonsmeared dentine byStreptococcus gordonii

摘要

SummaryThe purpose of this study was to investigate the penetration of smeared and nonsmeared dentine byStreptococcus gordonii.Prepared human roots, grouped as either nonsmeared or smeared, were immersed in a suspension ofS. gordoniicells for 3 weeks. The roots were then prepared for scanning electron microscopy and histological analysis. Dentine discs prepared from coronal dentine were grouped similarly. Using a fluid filtration apparatus, the hydraulic conductance (Lp) of each disc was determined before and after incubation with bacterial suspension. Scanning electron microscopy evaluation of the roots following infection with bacteria showed no change in the smear layer (P0.05). The results suggest that dentinal smear layers are an effective barrier to dentinal tubule invasion byS. gordonii.