NBDHE Test Community Oral Health Principles 1 — Questions and Answers
Question 1: The Oral Hygiene Index-Simplified (OHI-S), developed by Greene and Vermillion, is calculated by combining scores from which two sub-indices?
- Debris Index and Calculus Index (Correct answer)
- Plaque Index and Gingival Index
- Bleeding Index and Pocket Depth Index
- Calculus Index and Probing Depth Index
Correct answer: Debris Index and Calculus Index
The OHI-S scores the amount of soft debris (Debris Index) and hard calculus deposits (Calculus Index) on six representative tooth surfaces, then averages each sub-index and sums them to produce an overall oral hygiene score.
Question 2: The Community Periodontal Index (CPI) is primarily used in population surveys to assess:
- Periodontal status and treatment needs across age groups (Correct answer)
- Caries prevalence in school-aged children
- Severity of dental fluorosis in a community
- Oral hygiene compliance following patient education
Correct answer: Periodontal status and treatment needs across age groups
The CPI uses a specially calibrated probe on index teeth to record the worst periodontal condition in each sextant (bleeding, calculus, or pocket depth), allowing estimation of periodontal disease burden and corresponding treatment needs at the population level.
Question 3: In the hierarchy of prevention, tertiary prevention in community oral health is best exemplified by:
- Providing dentures or implants to restore function after tooth loss (Correct answer)
- Applying fluoride varnish to high-risk children
- Conducting early caries screenings at community health fairs
- Teaching proper brushing technique in school programs
Correct answer: Providing dentures or implants to restore function after tooth loss
Tertiary prevention addresses disability and loss of function that has already occurred — replacing missing teeth with prostheses or implants rehabilitates function after disease has progressed beyond treatment, distinguishing it from primary (preventing disease onset) and secondary (early detection and treatment) prevention.
Question 4: According to the Health Belief Model, which combination of perceptions is most likely to motivate a patient to adopt daily flossing?
- High perceived susceptibility to periodontal disease and high perceived benefits of flossing (Correct answer)
- High self-efficacy alone, regardless of perceived threat
- External cues to action without personal perceived susceptibility
- Low perceived severity because the condition is 'just gum disease'
Correct answer: High perceived susceptibility to periodontal disease and high perceived benefits of flossing
The Health Belief Model holds that behavior change requires individuals to perceive themselves as personally susceptible to a condition AND believe the recommended action will produce meaningful benefits; without both elements, motivation to act is typically insufficient.
Question 5: The federal Early and Periodic Screening, Diagnostic, and Treatment (EPSDT) benefit under Medicaid is significant in community oral health because it:
- Mandates comprehensive dental coverage, including preventive and restorative care, for eligible children under age 21 (Correct answer)
- Provides fluoride supplements exclusively to rural communities
- Funds community water fluoridation infrastructure in underserved states
- Covers dental care for Medicare-eligible adults age 65 and older
Correct answer: Mandates comprehensive dental coverage, including preventive and restorative care, for eligible children under age 21
EPSDT requires states to provide broad dental services — exams, radiographs, preventive treatment, and restorations — to all Medicaid-enrolled children under 21, making it the primary federal mechanism for addressing oral health disparities in low-income pediatric populations.
Question 6: Dean's Fluorosis Index is used in community surveys to:
- Classify the severity of enamel fluorosis across a population and calculate a community fluorosis index score (Correct answer)
- Measure the fluoride concentration in a community's water supply
- Determine the optimal fluoride dosage for dietary supplement prescriptions
- Assess fluoride uptake in patients receiving professional fluoride treatments
Correct answer: Classify the severity of enamel fluorosis across a population and calculate a community fluorosis index score
H. Trendley Dean developed the fluorosis index to categorize enamel fluorosis into six ordinal categories (normal to severe) and compute a Community Fluorosis Index by weighting each category's prevalence, enabling comparisons of fluorosis burden across populations with different water fluoride levels.
NBDHE Test Community Oral Health Principles 1
The Oral Hygiene Index-Simplified (OHI-S), developed by Greene and Vermillion, is calculated by combining scores from which two sub-indices?