Factors affecting initiation and progression of lesions

Question 1

what is the first needed phase fro plaque formation

Answer 1

a biofilm

Question 2

what is a biofilm

Answer 2

community of microorganism attached to a surface 
work together
commensal
vary at sire
use extra cell material

Question 3

what is meant by commensal

Answer 3

normal bac but in given circumstances - can cause disease

Question 4

what is the sequence of events for a susceptible tooth

Answer 4

pellicle formation
bacterial colonisation
microoclony formation

Question 5

what is needed in pellicle formation

Answer 5

acelular

proteinaceous film derived from saliva

Question 6

where is the bac in stagnation

Answer 6

0-4 hours

s sanguines s oralis s mitis actnomyces gm -ve bac mutans strep

Question 7

how long for micro colony form

Answer 7

4-24 hours

Question 8

where are some common areas of plaque stagnation

Answer 8

gingival recession - root caries

adjacent to partial dentures

Question 9

what is it called the changing of oral micrfloa from streptococci to acitnomyces

Answer 9

microbial succession 1-14 days

Question 10

what does acidogenic mean

Answer 10

transport sugars in diet nd convert to acid lactic acid

Question 11

what does acidic mean

Answer 11

thine in low pH

Question 12

what si the specific plaque hypothesis

Answer 12

approx 300 species of intra oral microorganisms
sp limited number involved in carious process
immunise against

Question 13

what is non specific plaque hypothesis

Answer 13

caries results from the over all activity of the micro organisms within the biofilm
all plaque to be removed

Question 14

what is ecological plaque hypothesis

Answer 14

plaque can accumulate at all tooth sites
balance microflora change dept on local enviro
acidurici and acidogenic
remove plaque from susceptible sites

Question 15

what does the stephen curve measure

Answer 15

cariogenicty

pH with sucrose intake

Question 16

from demin to lesion arrest what is shown

Answer 16

improved OH
fluoride
decrease sugar intake

Question 17

what lesion arrest from demin

Answer 17

uptake sugar intake
poor oral hygiene
no topical floride

Question 18

what are the two zones of dentine caries

Answer 18

outer an dinner zones

Question 19

what is the outer zone

Answer 19

outer

demin, denatured, infected and not remin

Question 20

what is the inner zone

Answer 20

dentine demin, minimally infected, collagen fibres intact and dentine remix

Question 21

what is challenging th biofilm within use

Answer 21

fissure sealants
ultraconservative caries removal
stepwise excavation
hall technique

Question 22

what is the first visit of stews excavation

Answer 22

remove only superficial later of infected necrotic dentine
ensure peripheral caries removal complete
place CaOH lining and glass ionomer
leave 6-12 months

Question 23

what is done in the second visit of stepwise excavation

Answer 23

re celan cavity and restore

Question 24

what was seen in the first visit

Answer 24

all sites after first excavation were soft, wet, pale and heavily infected

Question 25

what is seen in secondary visited stepwise

Answer 25

all harder dry dark and reduction in level of infection

Question 26

what is the microbiology using this techs

Answer 26

decrease microbial load
reduction in microbial diversity
reduction in nutrient amount and complexity fro pulp