1. Tests for prediction and Activity of dental caries Presented by : Deepti Awasthi 2.
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Transcript of 1. Tests for prediction and Activity of dental caries Presented by : Deepti Awasthi 2.
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Tests for prediction and Activity of dentalcaries
Presented by :
Deepti Awasthi
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CONTENTSIntroductionDefinitionObjectivesUses for ClinicianIdeal requisites of caries activity
testTestsConclusionReferences
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INTRODUCTION
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DEFINITIONSCaries activity
Caries susceptibility
Caries activity tests
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ObjectivesIdentify high risk group and individualDetermine need for preventive
measuresTo serve as an index of the success of
the therapeutic measures.To motivate and to monitor the
effectiveness of education programs Manage the progress of restorative
procedures.
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Uses for ClinicianDetermine need for caries control
measureIndicator of patient co-operationAid in timing of recall appointmentsGuide to insertion of expensive
restorationsDetermine the prognosisPrecautionary signal to the
orthodontist in placing bands
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IDEAL REQUISITESSound theoretical basisMaximum correlation with clinical
status.Accurate with respect to duplication of
results.Simple Quick in performance Inexpensive , feasibleValidityReliabilitySensitivity Specificity
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Various caries activity tests
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1. LACTOBACILLUS COLONY COUNT TEST
introduced by HADLEY in 1933
Principle This test measures the number of
acidogenic and aciduric bacteria in patient’s saliva by counting the number of colonies on tomato peptone agar plates after inoculation with a sample of saliva. Cariology , 3rd Ed. -
Earnest Newbrun
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Procedure patient chews a small piece of paraffin
before breakfast The saliva that accumulates in the 3
minute period is collected in a sterile container
Saliva collected is shaken by a machine for 2 minutes
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The saliva sample is diluted with sterile saline solution to 1:100
0.4 ml of each sample is spread on the surface of an agar plate
The plates are incubated for 3 to 4 days at 37°C
The number of Lactobacillus colonies that
develop are counted using Quebec counter.
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Interpretation of LB colony count test
No. of organism CFU/ml
Symbolic designation Degree of caries activity
0-- 1000 + Little or No
1,000– 5000
5000-- 10,000
> 10,000
++
+++
++++
Slight
Moderate
Marked
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Disadvantages
Quick and easy but results are available in days.
Counting colony tedious complex instrument, trained
personnel requiredNot completely exclude the growth
of other relatively aciduric organismsInaccurate for predicting the onset
of caries
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2. Colorimetric SNYDER TEST
SNYDER in 1951
PrincipleTest measures the ability of
salivary microorganisms to form organic acid from a carbohydrate medium
o Bromocresol green indicator dye, changes colour from green to yellow at pH 5.4 to 3.8
Essentials of Preventive and community Dentistry- Soben Peter
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Procedure Salivary sample is collected after the
patient chews a small piece of paraffin before breakfast.
0.2 cc of saliva is pipetted into the
10ml melted agar containing medium in a test tube at 50°C, allowed to solidify and then incubated at 37°C .
The incubation period is upto 72 hours.
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.The media contains :BactopeptoneDextroseSodium chlorideAgarBromocresol green
The rate of colour change from green to yellow is indicative of the degree of caries activity.
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INTERPRETATION TIME
24 hrs 48 hrs 72 hrs
COLOUR YELLOW YELLOW YELLOW
CARIES ACTIVITY MARKED DEFINITE LIMITED
COLOUR GREEN GREEN GREEN
CARIES ACTIVITY CONTINUE TEST CONTINUE TEST INACTIVE
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Advantages : relatively simpleModerate cost
Disadvantages :Time consumingSometimes color change is not
very clearLimited predictive value
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3. THE SWAB TEST GRAINGER et al in 1965.
Principle same as Synder test.
Cariology , 3rd Ed. - Earnest Newbrun
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Procedure
The oral flora is sampled by swabbing the buccal surfaces of the teeth with a cotton applicator,
subsequently incubated in the medium.
The change in the pH following a 48 hour incubation is read on a pH meter or the colour change is read by the use of a colour comparator.
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Interpretation :
pH 4.1 and < 4.1 = Marked caries pH 4.2 to 4.4 = ActivepH 4.5 to 4.6 = Slightly activepH 4.6 and over = Caries inactive
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4. SALIVARY REDUCTASE TEST
measures the activity of the reductase enzyme present in salivary bacteria
This enzyme is involved in the reactions for the formation of products dangerous to the tooth surface.
Rate at which the indicator molecule , diazoresorcinol, changes from blue to red to colorless
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Procedure
Saliva is collected by chewing a special flavoured paraffin and expectorated directly into collection tubes
The sample is then mixed with the dye Diazo-resorcinol
The colour changes and the “Caries Conduciveness” reading is taken after 15 minutes
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COLOUR CHANGES
COLOUR CARIES CONDUCIVENESS
Blue 15 minutes
Non – Conducive (1)
Orchid 15 minutes
Slightly Conducive (2)
Red 15 minutes
Moderately Conducive (3)
Red Immediately
Highly Conducive (4)
Pink/white Immediately
Extremely Conducive (5) 25
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Advantages
No incubation Quick results
Disadvantages
Results vary with time after food intake & after brushing
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5.ALBAN TESTSimple modified Snyder test
Main Features: softer medium that permits the
diffusion of saliva and acids without melting the medium.
simpler sampling procedure , patient expectorates directly into tubes containing the medium
Essentials of Preventive and community Dentistry- Soben Peter
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following materials are required:
Synder test agarA small scale to measure 60
grams. A 2 litter Pyrex glass to melt the
medium.A funnel to dispense the medium
into test tubes. 100 - 16 mm test tubes with
screw caps
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Procedure : 60gms of Snyder test agar is placed in 1 litre
of water &suspension is brought to a boil over a low flame.
When thoroughly melted the agar is distributed
The tubes are autoclaved for 15 minutes:
allowed to cool and stored in a refrigerator.
2 tubes are taken & the patient is asked to expectorate a small amount of saliva directly into the tubes.
incubated at 370C for upto 4 days
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observe for:
Change of colour from bluish green (pH 5) to definite yellow (pH 4 or below).
The depth in the medium to which the change has occurred.
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Scale for Scoring:1. No colour change =
‘3/4’2. Beginning colour change = ‘+’ (from top to medium down)3. One half colour change = ‘++’ (from top down)4. Three fourths colour change
= ‘+++’ (from top down)5. Total colour changes to yellow =
‘++++’
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Advantages: Simplicity, Low cost, Diagnostic value when negative
results are obtained. Motivational value Disadvantages:More armamentariumSubjective evaluation
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6. SALIVARY BUFFER CAPACITY
Action Measures the no. of mls of acid
required to lower the pH from 7 to 6. Equipment pH meter0.05N lactic acidParaffinSterile glass jars containing small
amount of oil.
Cariology , 3rd Ed. - Earnest Newbrun
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Procedure
10ml of saliva collected under oil 1hr after eating
5ml is taken into a beakerpH of saliva is adjusted to 7.0Lactic acid is added until pH of
6.0 is reached.The no. of ml of lactic acid
needed to reduce pH is a measure of buffer capacity.
Evaluation :Inverse relationship
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7. STREPTOCOCCUS MUTANS LEVEL IN SALIVA measures the number of
Streptococcus mutans colony forming units per unit volume of saliva
Incubation is done on Mitis Salivarius Agarwith addition of sucrose (20%) & 0.2U bacitracin /ml which supresses the growth of most non-S.Mutans colonies
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Procedure The samples of organisms is
obtained by the use of tongue blades
Sample then pressed against Mitis Salivarius
Bacitracin Agar in special Petri dishes
incubated at 370C for 48 hrs in 95%& 5%CO2
gas mixture Cariology , 3rd Ed. - Earnest Newbrun
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Interpretation : Levels of Streptococcus Mutans > 10 5/ ml of saliva = unacceptable,
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Disadvantages
Difficulty of distinguishing between a carrier state and cariogenic infection.
S. Mutans may constitute less than 1% of total flora of plaque.
S. Mutans tends to be located at specific sites only.
Not convenient for chair side
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8.Dip slide method Dentocult Larmas ,1975S.Mutans levels in saliva
ProcedureSaliva is collected and poured over the agar
coated slide & allowed to dryBacitracin disks are placed in the middle
Co2 tablet is inserted in the tube & then incubated for 48 hrs.
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Colony density (small blue colonies) compared with model chart
0 - negligible1 - <105
2 - 105 - 106
3 - > 106
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9.Plaque / tooth pick method
Action Simple screening of diluted plaque
sample ProcedurePlaque samples are collected from
the gingival thirds of buccal tooth surfaces & placed in Ringer’s solution
Suspension is stretched across MSA plates
Incubation at 370C for 72 hrsCariology , 3rd Ed. - Earnest Newbrun
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10. S. mutans adherence method
Saliva inoculated in MSB broth for 24 hrs at 37°C After growth, the supernatant removed Cells adhering to the glass examined macroscopicallySCORE NO OF COLONIES
- No growth expressed
+ Few deposits from 1-10
++ Scattered deposits of smaller size
+++ Numerous minute deposits & more than 20 large deposits (indicates > 105 CFU/ml)
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10.Fosdick Calcium dissolution test
Principle Measures the mgs of powdered
enamel dissolved in 4 hours, when patients saliva mixed with glucose and powdered enamel.
Essentials of Preventive and community Dentistry- Soben Peter
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Advantages Correlation reported is good
Disadvantages Complex equipmentExpensive, trained personnel.
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11. DEWAR TEST
Test similar to fosdick calcium dissolution test
Except that in this test the pH of the mixture is measured instead of the amount of calcium dissolved by the acid.
Essentials of Preventive and community Dentistry- Soben Peter
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12. CARIOSTAT TEST
Tsutomu Shimono 1974
This test has been reported to significantly
correlate with counts of S.mutans in childrenuses a semisynthetic liquid containing
sucrose, tryptose, a gram-negative bacteria growth inhibitor, and bromcresol green and bromcresol purple indicators.
The test assesses acid production by cariogenic bacteria and thus indirectly assesses caries activity
The sensitivity and specificity of a colorimetric microbiological caries activity test (Cariostat) in preschool children
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Interpretation of Cariostat test
Score pH Color Caries Activity
0 7
Blue Caries inactive
1 5.5 Green Slight caries
2 4.5 Yellow - Green Moderate caries
3 4.0 Yellow Marked caries
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13.OratestRosenberg et al. in 1989 PrincipleThe rate of oxygen depletion by
micro organisms in expectorated milk samples
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Under aerobic conditions the bacterial enzyme, aerobic dehydrogenase transfers electrons or protons to oxygen.
Once oxygen gets utilized by the aerobic organisms and an anaerobic environment is attained, methylene blue acts as an electron acceptor and gets reduced to leucomethylene blue
The metabolic activity of the aerobic microorganism is reflected by the reduction of methylene blue to leucomethylene blue.
Oratest: A Simple Chairside Aid for Caries Risk Assessment
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Advantages Simple , inexpensive , less time
consuming , reproducible and requiring no trained personnel.
Used to monitor mouth rinse regime , denture hygine , gingival inflammation and plaque levels.
Good educational and motivational tool for patient,school and community health programmes.
Vehicle for test is nontoxic (milk)Anticipate the onset of cariesResults can provide dentist to command
patient to reinforce motivation ,plaque control and behaviour
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Disadvantages It does not identify a specific group
of organism in a specific disease.It cannot accurately differentiate
between the healthy state and between initial and progressive carious lesion
Lack of specificity since positive observation can be obtained in gingivitis and other oral ailments.
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14. Salivary glucosyltransferase bGtfs play a critical role in the
pathogenesis of caries and furthermore, the enzymes are present in whole saliva.
Therefore, hypothesized that the amount of Gtfs collectively or separately could be correlated with caries activity.
chair side and provide results within minutes
Salivary Glucosyltransferase B as a Possible Marker for Caries Activity-
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2 ml of saliva was collectedsaliva was clarified by centrifugation,Clarified saliva was mixed in a 1:1 ratio
with the coating buffer supplied in the kit and was coated onto 96-well plates
After washing, antibodies to Gtf B, C and D were applied
intensity of the color in the wells, which correlated to the amount of purified Gtf present, was read in an ELISA reader
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15. CariScreen Caries Susceptibility Test is done in one minute at chairsideATP bioluminescence technology, which is a test for
light reaction, will measure on a scale from 0 to 9999.
the levels of acid-producing bacteria by swabbing lingual surfaces of lower anterior teeth and then inserting the sample in the CariScreen meter to be read
0 to 1500 is low risk and 1500 to 9999 is high riskThe ATP generates light once it reacts with luciferin,
a light-emitting biological pigment/enzyme present in the CariScreen. The amount of light emission is in direct proportion to the amount of ATP and a well-known fact is that acid-producing bacteria contain 100 times more ATP than non-acid-producing strains
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16. Carivissystem for assessment of caries
activity relies on the unique properties of the Glowdent marker that detects actively occuring dental demineralisation
The amount of light emitted varies with the amount of minerals present
more minerals equals more light.
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Advantages of the Carivis SystemThe Carivis caries assessment system marks a new
approach in preventive dentistry. Its innovative design offers:
Non-invasive, one-step methodCaries activity assessment is possible with a single
visit to the dentistExtreme sensitivity and information on the extent of
demineralisationAccess to all dental surfaces, including contacting
surfaces of teeth and around restorationsEase of useSpeed; signal collection requires less than 10 seconds
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Salivary Glucosyltransferase B as a Possible Marker for Caries Activity-A.M. Vacca Smith. Caries Res. 2007 November; 41(6): 445–450
Using a Caries Activity Test to Predict Caries Risk in Early Childhood. Michiko Nishimura, JADA
Oratest: A Simple Chairside Aid for Caries Risk Assessment -Arora Ruchia, Lahiri. Prathik. Kb, Masih Updes. Int. j of dental clinics 2009:1(1): 26-30
The sensitivity and specificity of a colorimetric microbiological caries activity test (Cariostat) in preschool children. Pediatric Dentistry: July/Aug 1994 - Volume1 6, 4
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