الفهرس 
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Abstract
Aim: The aim of this study is to determine the bacterial count of cariogenic
bacteria after application of photoactivated oral disinfection versus chemical solution
(chlorohexidine). Methodology: This invitro study was conducted in Pediatric Dentistry
and Dental Public Health Department, Faculty of Dentistry, Cairo University, Egypt.
Bacterial inhibitory effect testing was conducted and samples were prepared at the
Medical Microbiology and Immunology laboratory in Faculty of Medicine, Cairo
University, Egypt.
Results: Regarding Bacterial Count; Lactobacillus count showed that PAD
(384.60±30.97) had a statistically significant higher value than chlorohexidine
(294.00±20.21) (p<0.001) in both intervals
24 and 48 hours, the same was for Streptococcus Mutans count as PAD
(125.03±19.01) had a statistically significant higher value than chlorohexidine
(73.80±7.85) (p<0.001)) in both intervals
24 and 48 hours. Regarding zone of inhibitions; Chlorohexidine (26.18±2.09) and
(26.91±2.07) had a statistically significant higher value than PAD (8.55±1.04) and
(8.91±0.83) with (p<0.001) in 24 and 48 hours respectively.
Conclusions: Photoactivated oral disinfection (PAD) had a higher statistically
significant difference regarding bacterial count (Lactobacilli and Streptococcus Mutans)
while chlorohexidine
was higher regarding zone of inhibition. PAD can be used as an alternative to
chlorohexidine.
Key words: Bacteria after Application of Photoactivated Oral Disinfection versus
Chlorohexidine.