الفهرس 
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Abstract
Dental caries is a multifactorial disease resulted from the interaction of multiple factors as the bacterial flora, morphology of the tooth, characteristics< of saliva, diet and immune response of the host. For elimination of bacteria, different methods have been recommended such as cavity disinfectants as laser, sodium hypochlorite, hydrogen peroxide, iodine, chlorhexidine and ozone that are used to eliminate or reduce the residual bacteria left in the cavity, decrease the development of secondary caries and increasing the rate of restoration success and durability. The study was carried out to evaluate the antibacterial effect of ozone versus chlorhexidine gel for disinfection of cavitated carious lesions in young permanent molars. Twenty children aged from (7-10) years with bilateral cavitated Class I carious lesions in young permanent molars and free from any medical conditions were included in the present study. An informed consent and ascent were taken from parents and children. The forty molars were divided into two groups; group I using ozone gel while group II using chlorhexidine gel as cavity disinfectant. Dentin sample was taken from each lesion then ozone or chlorhexidine gel were applied for 60 seconds on both lesions for each child. Another sample was taken from each lesion after washing and drying the cavity. Regarding microbiological evaluation for both Streptococcus mutans and Lactobacillus. The study revealed that there was statistically significant reduction of Streptococcus mutans and Lactobacillus count after application of either ozone or chlorhexidine gel . There were no statistically significant difference of Streptococcus mutans and Lactobacillus counts between both groups either before application of cavity disinfectant or after application of ozone or chlorhexidine gel.