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RCC 1001 Final Exam Questions And Accurate Answers
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RCC 1001 Final Exam QuestionsAnd Accurate Answers
In the closed sandwich technique, at what thickness is the liner applied?Answer *0.5
mm*
- In the open sandwich, applies as *>1.0 mm base*
In the open sandwich technique, the GI/RMGI must form the contact with the adjacent
teeth. (T/F)Answer *False*
- Must NOT form the contact (must be below)
Conventional GI provides a significant increase in dentine hardness at the cervical
margins, while RMGI does not. (T/F)Answer *True*, creates highest amount of calcium ->
decreases caries risk
GIC/RMGI are useful in a restoration because they provide:Answer A better *seal at
dental margins* (stabilize adhesive interface) and release *fluoride*
- Requires *composite lamination* to improve resistance to forces
All of the following are advantages of deep marginal elevation, except:
A. Supragingival elevation of margins
B. Seals dentin
C. Creates undercuts to stabilize restoration
D. Geometry for inlay/onlay restorationsAnswer *C*, fills undercuts and reinforces
undermined cusps
Overall, DME is a successful long-term solution
Surefill SDR is a bulkfill flowable with less shrinkage, but it should not be placed on what
surfaces?Answer *Occlusal and proximal*, due to its low filler content
Enamel is avascular, while the dentin-pulp complex is vital and responds to injuries.
(T/F)Answer True
The dentin-pulp complex has a cellular-driven defense against:Answer *pH fluctuations*
in the biofilm
- Tubular/peritubular mineralization, tertiary dentin
,Deep dentin has less tubules with smaller diameters. (T/F)Answer *False*, more tubules
(38,000-45,000) with larger diameter (1.6-2.5 micrometers)
Adhesive binds better at the superficial dentin. Why?Answer *Less water content*, and
the adhesive is hydrophobic
- Deep dentin has more peritubular dentin (greater SA), however its high water content
makes adhesion more difficult
When does the DPC react to caries?Answer *Early*, before demineralization reaches
DEJ or enamel breakdown
- Pre-dentin reduction, pulp cells in cell-free-zone, and dentin hypermineralization
(tubular sclerosis)
Tubular sclerosis forms a ___________ zone.Answer *Translucent* (minerals in tubules
gives homogenous appearance)
In the progressive stages of lesion formation, what is the first zone to form?Answer
*Translucent (sclerotic) zone*, followed by zone of demineralization
- Reactive dentin is next, and the zone of bacterial invasion forms last
Tertiary dentin is not as hard as primary dentin. (T/F)Answer *True*, less mineralized
and irregular tubules
Histology of primary dentinAnswer - Smooth odontoblastic processes
- No intratubular crystals
- Intertubular dentin cross-banded collagen and dense-apatite crystals
*Hard, only cut by bur or sharp cutting intstrument*
Secondary dentin has the same histology and clinical appearance
How does sclerotic dentin differ from primary dentin?Answer *Dark and harder*
- Can be seen before demineralization reaches dentin
Sclerotic vs tertiary dentinAnswer Sclerotic
- Translucent zone
- Responds to aging, mild irritation
- *Seal dentinal tubules* to wall of lesion
- Crystalline material precipitates
- *Harder than normal dentin*
, Tertiary
- Reaction = reparative
- Responds to caries, attrition, and operative
- Localized dentin deposit
- *Not as hard as primary*
Affected dentin contains less bacteria than infected dentin. (T/F)Answer True
Firm dentin is infected dentin. (T/F)Answer *False*, it is affected
- Infected dentin is soft dentin
Histologically, firm dentin may be referred to as:Answer *Demineralized* intertubular
dentin
- Collagen cross-linking remains
- Remineralizable as long as pulp stays vital
- Formation of intratubular fine crystals
- *Transparent* appearance
All of the following is a characteristic of soft dentin, except:
A. Denatured collagen
B. Bacteria
C. High mineral content
D. No self-repairAnswer C, *low mineral content*
The transition between soft and firm dentin has a ____________ texture.Answer Leathery
The difference between the zones becomes less distinct with rapidly progressing
lesions. (T/F)Answer True
Infected dentin is remineralizable. (T/F)Answer False
What is considered hard dentin?Answer Tertiary dentin, sclerotic dentin, and normal (or
sound) dentin
In slow progressing lesions, what occurs with the tubules?Answer *Sealing of tubules*
and occlusion
- In rapid lesion odontoblast processes are destroyed with *open tubule pathway*
Diagnosis of reversible pulpitis includes:Answer - Presence of pain
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