General Flashcards
(25 cards)
How does the bacterial composition of chronic periodontitis differ from periodontal abscess?
there is no difference in the bacteria present. What makes the bacteria more virulent/active in an acute periodontal abscess is unknown
why is the mouth an ideal place for bacterial growth?
- warm
- moist
- rich in nutrients
where does dental plaque begin?
the tooth pellicle
what is the dental pellicle?
a film of glycoprotiens that forms within minutes after cleaning
how does plaque develop after the pellicle formation?
pioneering bacteria attach to the tooth pellicle
- to begin with it is a thin layer
- then there is piles of cells
all lying perpendicular to the tooth surface
what occurs to plaque if it is undisturbed for 24 hrs?
develops into a complex community with a wide variety of bacteria (mainly gram + facultitive streptococci)
who developed the colour complex that groups together the different bacteria involved in gingival health and different disease states?
socranksy et al (1988)
what are the different colours in the colour complex?
- RED
- ORANGE
- YELLOW
- GREEN
- BLUE
- PURPLE
Which colours from the colour complex are associated with periodontitis?
- RED
- ORANGE
(PURPLE)
what colours are present in gingival health?
Yellow
Green
Blue
what bacteria are in the RED complex?
- Porphyromonas Gingivalis
- Bacteroides Forsythus
- Treponema Denticola
What bacteria are in the orange complex?
- Prevotella Intermedia
- Prevotella Nigrescens
- Peptostreptococcus micros
- F. Nuc nucleatum
- F. nuc polymorphum
- F. periodonticum
what bacteria are associated with gingival health (green complex)?
- E. corrodens
- C. gingivalis
- C. sputigena
- C. ochracea
- A. actinomycetemcomitans
what bacteria are in the yellow complex?
- S. mitis
- S. oralis
- S. sanguis
- Streptococcus sp
- S gordonii
- S. intrermedius
what bacteria are in the blue complex?
actinomyces species
what bacteria are in the purple complex?
V. parvula
A. odontolyticus
the composition of plaque is influenced by what?
diet
if a patient has a high protein diet then what can you expect their plaque to be like?
- alkaline
- more gram-negative organisms
- peptides present
peptides in plaque can cause what?
an offensive odour
if a patient has a high carb diet what can you expect to see in the composition of their plaque?
- acidic plaque
- reduction in gram-negative bacteria
plaque is an example of a biofilm. what is a biofilm?
A thin but robust layer of a community of micro-organisms (mainly bacteria) that is suspended in a matrix of water and other substances to allow it to adhere to a solid surface (ie tooth)
how does plaque increase in thickness?
due to cell division
what is the purpose of matrix fluid in plaque?
to provide nutrients for the bacteria and enable the plaque to resist toxic substances (such as antibiotics)
antibiotics would struggle to penetrate the plaque biofilm and kill organisms due to what?
the matrix fluid resisting toxic substances
