Multiple choice

Cases that do not respond to therapy and recur for unknown reasons belong to

  1. acute periodontitis

  2. chronic periodontitis

  3. refractory periodontitis

  4. bacute periodontitis

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Refractory Periodontitis was coined in 1989 classification of periodontal diseases. It existed for a decade as a separate disease till 1999 when it was removed from the classification. A new term called recurrent periodontal disease was coined.