Dental Public Health and Community Dentistry
Measures and study designs
Prevalence is the proportion with disease at a point in time; incidence is new cases over a period. DMFT and DMFS count decayed, missing, and filled permanent teeth or surfaces, while dmft is the primary-dentition equivalent. Community periodontal indices and oral hygiene indices are common screening tools. Screening concepts include sensitivity (true positives), specificity (true negatives), and predictive values, which shift with prevalence. Study designs include cross-sectional, case-control, cohort, and randomized controlled trials; know which supports causation.
Community interventions
Community water fluoridation at 0.7 mg/L is the most cost-effective population measure and is safe at recommended levels. Other measures include fluoride varnish and rinse programs, school sealant programs, and dietary and tobacco counseling. Screening with referral and care coordination improves access.
Access and policy
Caries is not evenly distributed; a minority of the population carries most of the disease. Workforce models (hygienists, therapists, community health workers), Medicaid and insurance coverage, and teledentistry all influence access. Healthy People objectives frame national targets.
Traps
Do not confuse prevalence with incidence, and remember DMFT counts a missing tooth only when it was lost to caries. Sealants are for pits and fissures, not smooth surfaces.
Rule of thumb
When comparing communities, report both mean DMFT and the proportion of disease-free children, because the mean alone hides polarization of disease.