ORE Part 2 Periodontics

Question 1

According to the 2017 World Workshop classification, what defines Stage III periodontitis?

Accepted Answer

Interdental CAL ≥5mm, radiographic bone loss extending to the middle third of the root, and potential for tooth loss

Answer

Gingivitis with bleeding on probing only

Answer

Interdental CAL of 1–2mm at site of greatest loss

Answer

Complete loss of attachment with spontaneous tooth exfoliation

Question 2

What is the primary aetiological factor in the initiation of periodontal disease?

Accepted Answer

Dental plaque biofilm

Answer

Occlusal trauma

Answer

Genetic predisposition

Answer

Smoking

Question 3

A patient presents with 6mm probing depths and bleeding on probing after completing non-surgical periodontal therapy. What is the next step in management?

Accepted Answer

Reassess at 3 months and consider surgical access for root debridement

Answer

Repeat oral hygiene instruction only

Answer

Extract all affected teeth

Answer

Prescribe long-term systemic antibiotics

Question 4

Which periodontal probe marking system is used for the WHO Community Periodontal Index (CPI)?

Accepted Answer

WHO/CPITN probe with a 0.5mm ball tip and markings at 3.5, 5.5, 8.5, and 11.5mm

Answer

Williams probe with 1mm markings

Answer

UNC-15 probe with 1mm markings to 15mm

Answer

Nabers furcation probe

Question 5

What is the biological width (now termed supracrestal tissue attachment), and why is it clinically significant?

Accepted Answer

The combined height of junctional epithelium and connective tissue attachment above the alveolar crest, violation of which causes inflammation and bone loss

Answer

The width of keratinised gingiva, important for aesthetics

Answer

The depth of the gingival sulcus in health

Answer

The width of the interdental papilla

Question 6

Which bacterium is most strongly associated with aggressive (now Stage III/IV Grade C molar-incisor pattern) periodontitis?

Accepted Answer

Aggregatibacter actinomycetemcomitans

Answer

Streptococcus mutans

Answer

Porphyromonas gingivalis

Answer

Fusobacterium nucleatum