ORE Part 2 Periodontology 2 — Questions and Answers
Question 1: What is the primary goal of the 'Step 1' in the BSP four-step periodontal treatment model?
- Patient education, risk factor modification, and supra-gingival biofilm removal (Correct answer)
- Subgingival debridement under local anaesthesia
- Periodontal surgery
- Supportive periodontal therapy
Correct answer: Patient education, risk factor modification, and supra-gingival biofilm removal
Step 1 focuses on patient education, oral hygiene instruction, risk factor management (e.g., smoking cessation), and professional removal of supra-gingival plaque and calculus.
Question 2: Which cell type is primarily responsible for alveolar bone resorption in periodontitis?
- Osteoclasts (Correct answer)
- Osteoblasts
- Fibroblasts
- Neutrophils
Correct answer: Osteoclasts
Osteoclasts are the multinucleated cells responsible for resorbing alveolar bone in response to the inflammatory mediators triggered by periodontal pathogens.
Question 3: Which antibiotic combination has been used as an adjunct to mechanical debridement in aggressive periodontitis?
- Amoxicillin and metronidazole (Correct answer)
- Doxycycline alone
- Azithromycin and clindamycin
- Penicillin V only
Correct answer: Amoxicillin and metronidazole
The combination of amoxicillin (500 mg TDS) and metronidazole (400 mg TDS) for 7 days has evidence for adjunctive use in generalised Stage III/IV Grade C periodontitis.
Question 4: What is the recommended probing force for periodontal assessment?
- 0.2–0.25 N (20–25 g) (Correct answer)
- 1.0 N
- 0.5–0.75 N
- 0.1 N
Correct answer: 0.2–0.25 N (20–25 g)
A probing force of 0.2–0.25 N (20–25 g) is internationally recommended to standardise periodontal pocket depth measurements.
Question 5: In periodontal diagnosis, what does a vertical bone defect on a radiograph indicate compared to a horizontal defect?
- Angular bone loss suggesting an infrabony component amenable to regeneration (Correct answer)
- Generalised horizontal bone loss only
- Healthy bone architecture
- Periapical pathology
Correct answer: Angular bone loss suggesting an infrabony component amenable to regeneration
Vertical (angular) bone defects suggest infrabony pockets that may be amenable to regenerative surgical therapy, unlike horizontal bone loss.
Question 6: What is the primary pathogenic bacterium associated with localised Stage III Grade C periodontitis (formerly aggressive)?
- Aggregatibacter actinomycetemcomitans (Aa) (Correct answer)
- Porphyromonas gingivalis
- Treponema denticola
- Fusobacterium nucleatum
Correct answer: Aggregatibacter actinomycetemcomitans (Aa)
Aggregatibacter actinomycetemcomitans is strongly associated with localised aggressive (now Grade C) periodontitis, particularly its JP2 clone in younger patients.
ORE Part 2 Periodontology 2
What is the primary goal of the 'Step 1' in the BSP four-step periodontal treatment model?