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WorksheetsCARIOLOGY - MIDTERMS
Total questions: 61
Worksheet time: 33mins
Which of the following is NOT a composition of biofilm?
Water
Extracellular matric
Carbohydrates
their by-products
A term historically used to describe the soft, tenacious film accumulating on the surface of teeth.
(a)
The biofilm is adherent to food debris, not a result from the haphazard collection of opportunistic microorganism
The 1st statement is CORRECT, 2nd statement is INCORRECT
BOTH statements are CORRECT
The 1st statement is INCORRECT, 2nd statement is CORRECT
BOTH statements are INCORRECT
____________ demineralization may cause localized dissolution and destruction of the calcified dental tissue caries lesion.
Repeated
Cavitation in the enamel surface
Dentin
Enamel
(a) due to demineralization of the inorganic phase, and denaturation and degradation of the organic phase
(a) collapse of the surface from demineralization at the enamel subsurface level
Low pH has effects both on the biofilm composition and at the tooth surface level
True
False
Low pH drives calcium and phosphate from the tooth to the biofilm in an attempt to reach equilibrium, hence resulting in a net loss of mineral by tooth called (a)
What are the strategies that maintain a healthy microbiome?
Probiotic
Prebiotics
pH modifiers
All of the above
Pathological factors that demineralize the tooth (Select all that applies)
Acid-producing bacteria
Saliva flow of the patient
A only
None of the above
Functions of the pellicle (choose the correct one/s)
to protect the enamel
to provide a matrix for demineralization
to provide a matrix for remineralization
to reduce friction between teeth
ALL OF THE ABOVE
Pits and fissures provide excellent mechanical shelter for organisms and harbor a community dominated by S. sanguis and other streptococci
True
False
The SECOND most susceptible areas to dental caries lesions
Pits and fissures
Proximal enamel surfaces
Lingual
All of the above
Smooth enamel surfaces protected physically and are relatively free from the effects of:
Mastication
Tongue movement
Biochemicals
Salivary flow
Smooth enamel surfaces important ecologic determinants for the biofilm community on the proximal surfaces:
Diet of the patient
Oral hygiene
The size and shape of the gingival papillae
Topography of the tooth surface
All of the above
Caries lesion progression in healthy individuals is usually _____ compared with the progression in compromised persons
SLOW
FAST
MODERATE
SWEET GIRL LANG
Poor oral hygiene and frequent exposures to sucrose-containing or acidic food can produce noncavitated initial lesion in (a) weeks.
Caries lesion progression from a noncavitated caries lesion to a cavitated caries lesion on smooth surfaces is estimated to be _____ months
12
14
16
18
Radiation related caries may develop in 3 months after (a) due to radiation therapy
Earliest evidence of enamel caries lesion also known as the "initial lesion" or (a) and seen only when the tooth surface is desiccated.
White spots of initial caries lesions partially or totally disappear visually when the enamel is dry
TRUE
FALSE
The third stage of enamel caries
The early lesion
Cavity fomation
Bacterial invasion of enamel
Phase of non-bacterial enamel crystal destruction
Forceful probing of the lesion a this stage can result in damage to the weakened porous enamel nd accelerate the progression of the lesion
TRUE
FALSE
Progression of dental caries in dentin is different from progression in enamel because of the ________
Structural difference of dentin
The composition of dentin
Pathways for the ingress of bacteria
None of the above
Dentin contains much less mineral and possesses microscopic tubules that provide a pathway for the ingress of the bacteria and egress of minerals
TRUE
FALSE
The enzymes related to tissue healing or remodelling of implied in dentin caries lesion progression
(a)
What are the structures that can be seen in advance dentinal caries?
Beaded dentin
Dead tracts
Transverse cleft
Oblong cleft
Caries lesion originating on the root are alarming because they: (choose the correct one/s)
have a comparatively rapid progression
closer to the pulp
often symptomatic
more difficult to restore
Proximal root surface near the CEJ is often unaffected by the action of hygiene procedures such as flossing and favor the formation of mature, cariogenic biofilm and proximal root surface caries due to: (select the correct one/s)
exposure to the oral environment as a result of gingival recession
concave anatomic surface contours
decreased salivary flow due to multiple medications
occasional roughness at the termination of the enamel
Caries lesions originating on the root are alarming because they...
have comparatively rapid progression
often asymptomatic
more difficult to restore
closer to the pulp
All of the above
Caries in cementum softens beneath the plaque over a wide area, producing (a) cavitity (determine the structure or shape)
Caries in cementum is due to the exposure of cementum by recession of the (a)
Identify the box (green)
(a)
______ is reduces the permeability of dentin, thus shielding the pulp from irritation
dentinal sclerosis
secondary dentin
dead tracts
The dentinal tubule become partly or completely filled with mineral deposits consisting of both (a) and whitlockite crystals
In highly active caries lesions, odontoblast may die before sclerosis has occurred.
True
False
Dead tract may form due to disintegration of odontoblast processes within the tubules
True
False
What are the protective mechanism of the pulp?
Tertiary dentin
Secondary dentin
Inflammation
All of the above
(a) produced in response to some form of irritation. It is also deposited at the base of the dentinal tubules corresponding to the area of the tooth that is subjected to irritation.
TRUE OR FALSE
Reactionary dentin is tertiary dentin formed by new generation of odontoblast-like cells due to stronger stimuli.
(a)
___________ dentin is tertiary dentin formed by surviving odontoblast cells, due to milder stimuli.
Reactionary
Reparative
(a) measures the degree to which the local environmental challenge favors the probability of carious lesions.
Caries activity test provides an index of the success of therapeutic procedures, and monitors the effectiveness of education program
First statement is CORRECT, second statement is INCORRECT
BOTH statements are CORRECT
First statement is INCORRECT, second statement is CORRECT
BOTH statements are INCORRECT
The uses of caries activity test, EXCEPT:
to modify the patient behavior as a part of counselling to restrict sucrose intake
establish a baseline of cariogenic pathogens as a basis for future evaluation and counselling
ensure a low level caries activity before starting any extensive procedures
None of the above
The criteria for an ideal caries activity test
valid
insensitive
reproducible
simple and inexpensive
measurable non-invasive
Test which measure caries susceptibility
(choose the correct ones)
Snyder's colorimetric test
S. mutans screening tests
Swab test
Dewar test
This measures the number of aciduric bacteria in a patient's saliva by counting the number of colonies which appear on tomato peptone agar plates
Lactobacillus colony test
S. mutans level saliva
Streptococcus mutans screening test
Dip-slide method for S. mutans
Lactobacillus colony test incubation at 37 degree celcius for ____ days
1-2
3-4
5-6
7-8
Measure the number of bacteria forming units per unit volume of saliva and plaque samples from discrete sites, such as occlusal fissures and proximal areas.
Dewar test
Swab test
S. mutans level in saliva
Lactobacillus colony test
S. mutans level in saliva incubation is done on (a) , selective streptococcal medium with addition of high concentration of sucrose (20%), and 0.2 Bacitracin (MSB), suppress the growth of most non-S. mutans colonies.
_____ method of S. mutans screening test is a simple screening of dilutes plaque sample streaked on a selective culture media
Plaque/tooth pick method
Saliva/tongue blade method
Dip-slide method
None of the above
_______ method S. mutans screening test that estimates the number of S. mutans in paraffin-stimulated saliva when cultured in Mutans Salivarius Bacitracin agar.
Plaque/tooth pick method
Saliva/tongue blade method
Dip-slide method
This method of S. mutans screening test is undiluted paraffin-stimulated saliva in poured on a special plastic slide, coated with MSA containing 20% sucrose
Plaque/tooth pick method
Saliva/tongue blade method
Dip-slide method
Albans test
A simplified substitute for the Snyder test.
Albans test
Swab test
Dewar test
Buffer capacity test
(a) test same as Fosdick Calcium Dissolution test this procedure is not commonly used, as it has not been adequately tested for clinical correlation
It is almost same as Snyder test, using a swab with a cotton applicator in the buccal surfaces of teeth which is subsequently incubated in the medium
Buffer capacity test
Swab test
Dewar test
Fosdick calcium dissolution test
This test evaluates the quantity of acid requires to lower the pH of saliva through an arbitrary pH interval
Swab Test
Colorimetric Snyder Test
Buffer capacity test
Dewar Test
Materials used in Buffer Capacity Test
Titration equipment
0.05 N lactic acid and 0.05 N base
Paraffin
Sterile glass containing a small amount of oil
All of the above
Measures the ability of salivary microorganisms to form organic acid from a carbohydrate medium
Buffer capacity test
Colorimetric Snyder test
Dewar Test
Swab test
Measure the mount of calcium dissolved. Milligram of powdered enamel dissolved in for hours by acid formed when the patient's saliva is mixed with glucose and powdered enamel.
Buffer capacity test
Snyder test
Dewar test
Fosdick calcium dissolution test
Measures the rate at which the indictor molecule diazoresorcinol, changes from blue to red to colorless or whitish on reduction by the mixed salivary flora.
Salivary reductase test
Buffer capacity test
Snyder test
Fosdick calcium dissolution test
