Microbiology Flashcards
What is materia alba made up of? look like? How is it removed?
- Soft accumulation of salivary proteins, food debris.
- White Cheese-like accumulation
- Can be removed with water spray.
What is dental plaque made up of? Looks like? Removed?
- Composed of bacteria, salivary glycoproteins, polysaccarides.
- Clear, yellowish grayish substance
- Must be mechanically removed.
What are the red complexes that are associated with subgingival disease?
P. Gingivalis
T. forsythia
T. denticola
What are the characteristics of supragingival calculus?
- Whitish yellow
- Clay-like consistency
- Easily detached
- Found near salivary ducts
What are the characteristics of subgingival calculus?
- Dark colored
- Hard, dense
What are the 4 forms of calculus (calcium phosphate) and where is it seen?
- Brushite. Found on recent/new calculus.
- Octa CP. On exterior layers
- Hydroxyapatite. Old calculus.
- Whitlockite. Subgingival calculus.
Is calculus an etiological agent of periodontitis?
No. I can be a secondary product, but is not the cause.
In initial lesions (stage I), Early lesion (stage II), and Established lesions (stage III), what cells predominate?
I. PMNs
II. Lymphocytes
III. Plasma cells
What does high RANKL levels indicate? High OPG?
RANKL= periodontitis
OPG=Healing phase.
Which cells predominate in chronic periodontitis?
Th2 cells and Plasma cells.
What is the stages of plaque formation?
- Pellicle forms form glycoproteins
- colonization by bacteria
- Progressive buildup of plaque substances
Which bacteria forms a lot of interactions with other bacteria?
-Fusobacterium nucleatum
-S. oralis
S. sangulis
How is sessile organisms more resistant to antimicrobials?
Protection by thick biofilm.
Phenotypic shift in behavior during biofilm mode.
Which are the predominant supragingival bacteria?
- Actinomyces
- Neisseria mucosa
- Capnocytophaga
Which are the predominant microbiota in subgingival plaque?
- Strep
- Actinomyces
- Eubacterium
- Veillonella
