NBDE 2 Important Operative Questions-1

QUESTION: Critical pH of developing cavity?
pH 5.5*

QUESTION: pH that enamel starts to demineralize –

QUESTION What can tell best thing about caries:
past caries history

QUESTION Which is least likely to predict future caries?
Amount of sugar intake
Frequency of sugar intake
Amount of caries and restorations
(I would have prob put amount of caries and restorations b/c this is known to be an indicatior of
past caries not future caries.)

QUESTION: 3 factors that affect caries initiation? substrate, bacteria, host susceptibity

QUESTION: Which of the following is the earliest clinical sign of a carious lesion?
A. Radiolucency
B. Patient sensitivity
C. Change in enamel opacity
D. Rough surface texture
E.Cavitation of enamel

QUESTION: What is true of Strep. mutans?
• Can live in plaque,
• Can live on gingival
• Can live in a child with no teeth
• Has to live on a non-shedding surface

QUESTION: Most Cariogenic? Sucrose… S.mutans adheres to the biofilm on the tooth by converting sucrose into an extremely adhesive substance called dextran polysaccharid.

QUESTION: How do cells first attach- dextran or lextran?

QUESTION: Caries progression –

QUESTION: what contributes to caries formation
– Lactobacillus

QUESTION: What helps in carious process but it is not the primary inititator for caries:

QUESTION: Lactobacillus: does not initiate caries but is part of the progression of caries

QUESTION What is the most important etiologic factor in getting caries?
Saliva ph
Refined sugar
fluoride tx
saliva flow

QUESTION: Which race has most caries in kid population?
• Hispanics

QUESTION: What race for children has highest caries incidence?

QUESTION: early childhood cariescentrals and molars

QUESTION: Which population has the most number of UNRESTORED caries
: black

QUESTION: White females have the most caries in permanent teeth

QUESTION: Know how to determine if a patient is a high caries risk?

QUESTION: most recent increase in caries is seen in:

QUESTION: New data regarding caries shows:
more smooth surface caries,
more pit-fissure caries,
same, more root caries
a. More root caries

QUESTION: Recent survey, what kind of stats on caries?
• inc in smooth surf caries – wrong
• inc in pit/fissure caries – wrong
• smooth surf caries and pit/fissure caries is same – wrong
• inc in root caries****

QUESTION: How do you diagnose root caries?

QUESTION: Best indicator of root caries is a soft spot

QUESTION: best clinical determinant of root caries ?
sensitivity to cold
sensitivity to sweets
soft spot on tooth –

QUESTION: Remineralized teeth are they stronger than regular enamel

QUESTION: For a lesion in enamel that has remineralized, what most likely is true?
1. The enamel has smaller hydroxyapatite crystals than the surrounding enamel,
2. The remineralized enamel is softer thanthe surrounding enamel,3. The remineralized enamel is darker than the surrounding enamel,
4. The remineralized enamel is rough and cavitated

QUESTION: Sign of remineralization:
rougher than tooth structure and darker, but not sure

QUESTION: What’s the characteristic of a remineralized tooth?
Darker, harder, more resistant to acid

QUESTION: Remineralized lesion is shiny and more resistant to future decay

QUESTION: Characteristic of a lesion that is remineralized:
black, dark, bright
black, dark, opaque
black, dark, cavitated

QUESTION: remineralized lesions, yellow: -more resistant to future caries

QUESTION: Remineralization?
Harder than normal. (Pit and fissure are most prevalent caries)

QUESTION: What does arrested caries look like?
Black dark

QUESTION: Leathery brownwhite lesion?
arrested, acute, chronic

QUESTION: Scleoritc dentin:
harder, better to bond to?

QUESTION: Which of these is NOT an important reason for a clinician to be able to distinguish

QUESTION: What is the most common site of enamel caries?
• pit and fissure*
• at the contact point
• slightly

QUESTION: Where does caries start?
Apical to proximal contact.

QUESTION: location of interproximal caries lesion :
below the contact

QUESTION: Most interproximal decay happens where?
– Just under the contact.

QUESTION: A class II caries is
: Apical to contact

QUESTION: When do you restore a lesion? –
When there is cavitation

QUESTION: When do you tx caries: half way to the enamel, through enamel, when you can see it
on xray (NO) Answer: cavitation

QUESTION: In which of these cases do you start restoration:
can see on x-ray,
cavitation present,
lesion ½ into enamel,
cross CEJ (not DEJ)

QUESTION: when you start to do a caries :
a) more than half way into enamel
b) in the DEJ
c) in CEJ
d) when you see it in the xray

QUESTION: When do you restore a tooth?
a. Either when its CAVITATED
when its ½ in enamel (but this can remineralize..)?
b. Nothing about dentin involvement

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