Lecture 2-Periodontal Microbiology and Calculus

Question 1

Ass. with Red Complex–certain periodontal pathogens

Answer 1

P. gingivalis
T. forsythia
T. denticola

Question 2

Blue complex

Answer 2

actinomyces species

Question 3

Orange complex–maybe periodontal pathogen

Answer 3

P. intermedia
P. micros
C. gracilius
C. rectus

Question 4

Purple complex

Answer 4

V. parvula

A. odontolyticus

Question 5

Yellow complex

Answer 5

S. mitis
S. oralis
S. sanguis
Streptococcus sp. 
S. gordonii. 
S. intermedius

Question 6

Supraginigival plaque gets nutrition from

Answer 6

saliva

Question 7

subgingival plaque gets nutrition from

Answer 7

blood

Question 8

Biofilm formation is via (2)

Answer 8

1. Co-aggregation

2. Co-adhesion

Question 9

Co-aggregation-

Answer 9

cell-to-cell recognition of genetically distinct cell types.

Question 10

Co-adhesion

Answer 10

interactions btw. suspended and already adhering micro-organisms

Question 11

Quorum Sensing

Answer 11

communication btw biofilm bacteria.

Question 12

Dental calculus

Answer 12

Mineralized plaque that forms on the surfaces of natural teeth and dental prostheses.

Question 13

2 types of dental calculus

Answer 13

supragingival-easily detached from tooth, white, usu. found opp. salivary ducts

subgingival-hard, dark colored, extend to base of pocket but not JE

Question 14

Detection of calculus via

Answer 14

tactile exploration
dental radiographs
a blast of air to open gingival margin
color of overlying gingiva

Question 15

Composition of calculus

Answer 15

Brushite (

Question 16

Plaque Assessment

Answer 16

0=no plaque
1= plaque is at the GM but cannot see with naked eye. Unless probed.
2= can see plaque