Friday, January 2, 2009

Antimicrobial Efficacies of Nepalese Toothpastes against Dental Pathogens and Prevalence of Dental caries

(Abstract published in the Fifth National Conference on Science and Technology, Nov.10-12, 2008, Kathmandu pp. 353-354)
Antimicrobial Efficacies of Nepalese Toothpastes against Dental Pathogens and Prevalence of Dental caries

A. Acharya1, B. Subedi1, B.Paudyal1, M. Jnawali1, P. Shakya1, U. KC 1,
U. T. Shrestha2, K.B. Tiwari1, 2, A. Singh1 and V. P. Agrawal2
1Central Department of Microbiology, Tribhuvan University, Kirtipur, Kathmandu
2Research Laboratory for Biotechnology and Biochemistry (RLABB), Maitidevi, Kathmandu
E-mail: md.jnawali@gmail.com

ABSTRACT
Dental caries is a multifactorial oral disease developed by the localized dissolution of the tooth hard tissues, caused by acids produced by bacteria in the biofilms (dental plaque) which eventually leads to cavities. Frequently encountered bacteria in caries are Streptococci (S. mutans, S. salivarious, S. sanguis, S. sobrinus and S. mitis) and others including some species of Actinomyces, Lactobacillus, Candida albicans and some anaerobes together with Bacteroids, Fusobacterium, and Prevotella etc. Maintainace of oral health is highly interrelated with use of toothpaste. Toothpaste need to contain various antimicrobial agents in order to reduce, control and prevent different kind of dental caries. Different brands have their own composition and concentration of ingredients for their efficacy. The consumers should aware about the facts associated with their health. Present study was carried out to determine the antimicrobial status of locally used toothpastes against common dental pathogens and to know dental caries condition of school children of Kathmandu valley. The dental pathogens were isolated and identified from various dental samples. Antibacterial activities of 25 different toothpastes available locally in markets were assessed against the isolates by standard agar well diffusion method. Altogether 638 students (325 of age group 12-13 years and 313 of age group 5-6 years) from 30 different schools of Kathmandu valley were included in the study and their dental status was examined and recorded by using WHO caries recording form with DMFT and DMFS as standard tools. Both monomicrobial and polymicrobial infections were observed in all cases. The dental pathogens isolates and identified were Streptococcus mutans, S. salivarious, S. sanguis, S. sobrinus, S. mitis, Lactobacillus species and Candida albicans. Out of 25 assayed toothpastes only 7 were found to be highly effective against all the tested pathogens. DMFS and caries percentage of age group 5-6 years and 12-13 years were found to be 3.79, 69% and 1.60, 53% respectively. But no significance difference at p less than 0.001 was observed among male and female of both age group. Strong correlation was found in dental caries status and type of schools, diet and toothpaste using habit. The result showed that the toothpastes containing Triclosan followed by fluoride as a major chemical ingredient possess significant antibacterial activities. In both age group caries percentage was found to be above the recommended level of WHO where as DMFS and DMST varies within the level.

3 comments:

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Bacteria in Photos

Bacteria in Photos