Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Operative Dentistry

Aim: This study was conducted to evaluate the antibacterial action of Theracal (light-cured calcium silicate) liner in comparison to Biner LC (light-cured calcium hydroxide) liner on permanent carious molars treated with step-wise excavation. Methodology: A total of 48 patients were assigned in this study. Participants were divided into two groups randomly according to the type of liner that was placed and sample of dentin that will be taken before placement of liner and after placement (6 months). Application of both materials was done according to the manufacturers{u2019} instructions after the excavation of caries on the cavity walls and dentin sample was taken from the central carious lesion for microbiological analysis, then the cavities were sealed with conventional glass ionomer cement as a temporary restoration. After 6 months, the cavities were reopened, temporary restorations and pulp capping material were removed, and second dentin sample was taken for microbiological analysis. Caries was excavated to firm dentin and teeth were restored with permanent resin composite restorations. Agar Diffusion test and Digital Colony Counter were conducted for the study. The measuring unit of the bacterial count was CFU/ml. Results: There was no statistically significant difference between the two groups for Streptococcus Mutants and Lactobacillus Bacterial count after 6 months

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