micro organims plaque and dental disease:) Flashcards
dental plaque/biofilm
diverse microbial community found on the tooth surface, embedded in a matrix of polymers
where is there greater density of plaque
where there is poor mechanical defence
impact of xerostomia
more plaque build up likey
two layers of organisms of subgingical plaque
loosely attatched
firmly attatched
describe loosely attached layer
dispersed
gram -
motile
firmly attached organisms
streptocicci
actionmycytes
diseases caused by plauqe
dental caires - erosive loss of enamel by chemical agents - nursing bottle caries early childhood caries
lactic acid and tooth decay
anaerobic fermentation of sugar by certain forms of bacteria forms lactate in mouth
lowers the pH leading too demineralisation
forms of acidogenic and acidouric bacteria
lactobacillus
streptococcus mutans
periodical disease
bacteria can enter the pulp chamber
- pain due to nerves in the pulp
- after carious infection it can spread to the soft tissues of the tooth and cause necrosis
routes of spread from the apex
from apical foramen into surrounding tissues
- blocking airways, discomfort to eyes
what is gingivitis/peridodontitis
bacterial consortia in sub gingival plaque
destructive periodontitis
forms a pocket on the gum line (due to bacteria growing subgingivally)
bacteria can feed and survive in the pocket
bone stats to degrade
how do periodontal pathogens grow
in micro colonies interspersed with other bacteria
what is acute necrotising ulcerative gingivitis associated with
fusco-spirochetal bacterial complex
