6.4

Question 1

Recurrent 
(“refractory
”) chronic
 periodontitis is associated 
with

Answer 1

P.g., and Prevotella intermedia (P. i.

Question 2

The “red complex” associated with chronic periodontitis consists of

Answer 2

P. g, T. forsythia
and
T. denticola

Question 3

A. a., 
P. g.
 and 
P. i. 
(and probably others) 
are difficult to eliminate by SRP alone
 because

Answer 3

they have the ability to
invade
pocket epithelial cells.

Question 4

). Antibiotics are most useful in treating periodontal diseases in which

Answer 4

A. a
. and P. g.
play a significant pa
thogenic role

Question 5

Antibiotic regimens for treating Aggressive Periodontitis

and Severe Chronic Periodontitis

Answer 5

a) Amoxicillin (500 mg TID) and metronidazole (2
50 mg TID)
combined for 8 days. This is the
most widely
used regimen.
b) [alternative for patients allergic to Amoxicillin] Azithromycin (500 mg dose on the first day, then 250 mg per day for the next 4 days). Patient compliance is good with this one-dose-per-day regimen.
c) [alternative for patients allergic to Amoxicillin] Metronidazole
(500 mg TID for 7 days).