Dentin MCQs _ Oral Histology MCQs
Dentin MCQs
Dentin MCQs
Oral Histology MCQs
Dentin MCQs _ Oral Histology MCQs
- Which of the following is correct?
A. Reparative dentin is characterized by having fewer and more twisted tubules than normal dentin and may include odontoblasts
B. Dead tracts appear black in transmitted and white in reflected ligth
C. Sclerotic transparent dentin appears transparent or light in transmitted light and dark in reflected light
D. All of the above
- Matrix vesicles:
A. Are found in mantle dentin
B. Contain collagen
C. Produce alkaline phosphatase
D. Inhibit mineralization
- One of the following statement is unique about circumpulpal dentine:
A. Collagen fibers are oriented perpendicular to DEJ
B. Vonkorff fibers are present
C. Contain phosphophoryn
D. Requires matrix vesicle for mineralization
- The most accepted theory for dentin sensitivity is: or Which of the following is the most accepted theory of transmission of dental sensation:
A. Transduction theory
B. Direct neural stimulation
C. Hydrodynamic theory
D. Hydrostatic theory
- In adult teeth, the type of dentin present underlying dentin-enamel junction is:
A. Predentin
B. Mantle dentin
C. Interglobular dentin
D. Tertiary dentin
- Fluid flow, in or out of the dentinal tubules is proportional to the tuble diameter by:
A. Third power of the diameter
B. Sixth power of the diameter
C. Square of the diameter
D. Fourth power of the diameter
- The formation of which of the following does not represent normal physiological process of dentin formation:
A. Primary and secondary dentin
B. Secondary dentin and circumpulpal dentin
C. Tetiary dentin and sclerotic dentin
D. All of the above
- Regarding teeth which statement is wrong:
A. Enamel is harder than dentine
B. Enamel has no cells
C. Ameloblast secrete enamel and dentine
D. Odontoblast produce dentin
- Excess deposition of calcium in the dentinal tubules is referred to as:
A. Sclerotic dentin
B. Mantal dentin
C. Interglobular dentin
D. Intertubular dentin
- 1st formed dental tissue:
A. Enamel
B. Dentin
C. Cementum
D. Bone
- The pain transmission through dentin is:
A. Direct neural stimulation
B. Fluid or hydrodynamic theory
C. Transduction theory
D. All of the above
- The type of dentin that is formed prior to root completion:
A. Inter tubular dentin
B. Peritubular dentin
C. Circum pulpal dentin
D. Secondary dentin
- Organic portion can be separated from the mineral by:
A. Incineration/organic chelation
B. Decalcification
C. Devitrification
D. Combustion
- Shape of crown and the size of the roots is determined by:
A. Pulp
B. Dentin
C. Enamel
D. Cementum
- Sclerotic dentin has following features:
A. Caries susceptible
B. Insensitive
C. Hypersensitive
D. Resistant to caries
- Inter globular dentin results due to:
A. Failure of coalescence of calcospherities
B. Fracture of the dentin
C. Artifact in light microscopy
D. Disturbance in dentinal tubules
- The main bulk of dentin is formed by:
A. Peritubular dentin
B. Mantle dentin
C. Inter tubular dentin
D. Predentin
- Tome’s firbres are:
A. With out but not with in the dentin
B. Odontoblastic processes in dental tubules
C. Type of sharpey’s fibres
D. Originate from tome’s granular layer
- Korffs fibres are seen in:
A. Mantle dentin
B. Secondary dentin
C. Reactionary dentin
D. Indeed dermal tubules
- The type of tertiary dentin which contains cellular inclusions is found in:
A. Sclerotic dentin
B. Mantle dentin
C. Predentin
D. Osteodentin
- The organic lining of the calcified dentinal tubules is known as:
A. Lamina propria
B. Lamina lucida
C. Lamina limitans
D. Lamina densa
- The cells that form secondary dentin are:
A. Cementoblasts
B. Fibroblasts
C. Odontoblasts
D. Osteoblasts
- Which of the areas of the tooth is most sensitive during cavity preparation:
A. Enamel (anterior teeth)
B. Enamel (Posterior teeth)
C. Dentin
D. Dentinoenamel junction
- Transmission of stimulus across dentin is:
A. Direct activation of nerve endings
B. Correlated with the innervation density of the dentin
C. Stimulus induced fluid flow
D. There is no transmission of stimulus across dentin
- During the formation of primary teeth:
A. Enamel forms more cervically than dentin
B. Enamel forms faster than dentin
C. Dentin forms faster than enamel
D. Processes of their cells remain in content with each other
- Compared to the inter tubular dentin, peritubular dentin is characterized by which of the following :
A. Greater stainability
B. Lasser content of inorganic salts
C. greater content of inorganic salts
D. Greater content of large collagen fibers
- All factors govering dentine permeability EXCEPT:
A. Smear layer
B. Fluid convection
C. Length of dentinal tubules
D. Diffusion coefficient
- The average diameter of coronal dentinal tubules near the pulp is:
A. 0.2-0.5 microns
B. 2-3 microns
C. 0.2-0.3 microns
D. 7 microns
- All of the following is true about dentinal tubules except:
A. Inner pulpal layer contains more dentinal tubules than outer dentin layer
B. The diameter of dentin tubules ranges from 5 to 7μm
C. The diameter of dentinal tubule is more at pulpal layer than outer layer
D. The bonding is more on the inner layer of dentin compared to outer surface
- S shape of dentinal tubules is due to:
A. Incremental deposition
B. Peritubular dentin
C. Crowding of odontoblasts
D. Due to excess amount of organic component
- Dentin formed through out the life is:
A. Sclerotic dentin
B. Secondary dentin
C. Reparative dentin
D. All of the above
- Dentinal tubules are calcified in:
A. Sclerotic dentin
B. Primary dentin
C. Secondary dentin
D. Interglobular dentin
- Accentuated incremental lines in dentin due to disturbances in matrix and mineralization process is:
A. Incremental lines of retzius
B. Incremental lines of vonebner
C. Contour lines of owen
D. None of the above
- Formula of hydroxyapatite crystal is:
A. Ca3 (Po4)2 CaCo3
B. 3Ca (Po4)2 Ca(OH)2
C. CaPo4 Ca(OH)2
D. None of the above
- Physically and chemically, the dentin is closely related to:
A. Bone
B. Acellular cementum
C. Enamel
D. None of the above
- The microhardness of dentin is about:
A. 1/2 that of enamel
B. 1/7 that of enamel
C. 1/4 that of enamel
D. 1/5 that of enamel
- Dentinogenesis by odontoblasts first begins at:
A. Pulpal end
B. Cusp tip
C. Tooth bud stage
D. Cervical area
- The zone of dentin most recently formed and uncalcified is known as:
A. Mantle dentin
B. Circumpulpal dentin
C. Predentin
D. Secondary dentin
- The dentin receptors are unique because:
A. They elicit pain to hot and cold
B. They elicit pain to touch and pressure
C. They elicit pain to chemicals
D. Elicit only pain as a response
- Mirgration of odontoblasts into dentinal tubules occurs during:
A. Cavity preparation
B. Dehydration
C. Water irrigation
D. None of the above
- The dentin adjacent to the dentinoenamel junction is called the:
A. Mantle dentin
B. Circumpulpal dentin
C. Predentin
D. Secondary dentin
- Which of the following dentinal layers is more mineralized:
A. Peritubular dentin
B. Inter tubular dentin
C. Dentinal tubules
D. Circum pulpal dentin
- Dead tracts in ground section appears as:
A. Dentinal tubules
B. Coarse fibril bundles arranged at right angle to the dentinal surface
C. Black in transmitted light and white in reflected light
D. White in transmitted light and dark in reflected light
