Free NBDHE Practice Test

In the pathogenesis of periodontal disease, which red complex Gram-negative anaerobic bacterium produces gingipain proteases that degrade host tissue collagen, cleave immunoglobulins, and disrupt complement pathways?

A 64-year-old patient with Stage 2 hypertension and a history of myocardial infarction 8 months ago requires local anesthesia for quadrant scaling and root planing. According to the American Heart Association (AHA) and standard dental hygiene pharmacology guidelines, what is the maximum recommended dose (MRD) of epinephrine for a cardiac patient at a single appointment, and which local anesthetic formulation provides an effective alternative if epinephrine must be minimized?

While performing periodontal debridement on the distal surface of the mesial root of tooth #30 (mandibular first molar) exhibiting a 6 mm probing depth with Class II furcation involvement, which specialized instrument design provides the most effective adaptation to the deep developmental depression and root concavity?

During periodontal debridement, a 62-year-old female patient with a history of stable angina pectoris suddenly clenches her chest, reporting crushing substernal pain radiating to her left shoulder, accompanied by dyspnea and cold diaphoresis. The dental hygienist terminates treatment and administers one sublingual nitroglycerin tablet (0.4 mg). After 5 minutes, the patient reports no symptom relief. Blood pressure is 148/92 mmHg and pulse is 92 bpm. What is the most appropriate next clinical management step?

A public health dental hygienist is evaluating the oral health status of 400 school-age children (ages 6–11) to establish baseline caries prevalence before launching a community fluoride varnish program. Which dental index is the standardized tool for recording caries experience in both the primary and permanent dentitions of these mixed-dentition children?

Patient Case (Questions 6–8): A 58-year-old male presents for a comprehensive dental hygiene evaluation. • Medical History: Type 2 diabetes mellitus diagnosed 7 years ago (most recent HbA1c: 8.4%); Stage 1 primary hypertension (136/88 mmHg, pulse 74 bpm); 25 pack-year smoking history (1 pack/day); Medications: Metformin (1,000 mg BID) and Lisinopril (10 mg daily). • Clinical Findings: Generalized moderate subgingival calculus; generalized 4–6 mm probing depths with bleeding on probing (BOP) at 45% of sites; localized 7 mm pocket on tooth #19 with 4 mm clinical attachment loss (CAL). • Radiographs: Generalized horizontal bone loss of 25–30% (coronal to mid-third of root), with localized angular/vertical defect on the mesial of tooth #19. [Case Question 1] Based on the 2017 AAP/EFP Classification of Periodontal and Peri-Implant Diseases and Conditions, what is the correct diagnosis for this patient's periodontal condition (Stage and Grade)?

Patient Case (Questions 6–8): [Case Question 2] Considering this patient's HbA1c of 8.4% and active 25 pack-year cigarette smoking history, which pathophysiological mechanisms most directly impair his periodontal healing and elevate his risk for progressive attachment loss following non-surgical periodontal instrumentation?

Patient Case (Questions 6–8): [Case Question 3] When formulating the dental hygiene care plan for this patient, which clinical management strategy represents the standard evidence-based approach?