Assessment of pH,streptococcus mutants count, lactobacillus count and immunoglobulin A among visually impaired children after nano silver varnish application it tri calcium phosphate phosphate varnish application

Sixty children will be randomly divided into three equal treatment groups, composed of 20 children each, according to the type of material used as follows:

• Group I: children will receive oral health education and nano silver fluoride varnish.
• Group II: children will receive oral health education and tri calcium phosphate varnish.
• Group III: children will receive oral health education

for all children ,Assessment of pH, streptococcus mutants count, lactobacillus count and immunoglobulin A will be assessed at baseline, one day , 3 months and 6 months after application

Inclusion Criteria:

Visually impaired children

Exclusion Criteria:

• uncooperative children or children not willing to participate in the study.
• Children with systemic diseases
• Children with bronchial asthma.
• Children who were on antibiotic or medications that might affect oral flora or salivary flow taken within the previous 3 months
• History of fluoride treatment in the past 3-4 weeks.