Question: During the formation of primary teeth_______________?

• 1. Enamel forms more cervically than dentin
• 2. Enamel forms faster than dentin
• 3. Dentin forms faster than enamel
• 4. Processes of their cells remain in content with each other

Question: Compared to the inter tubular dentin, peritubular dentin is characterized by which of the following ?

• 1. Greater stainability
• 2. Lasser content of inorganic salts
• 3. greater content of inorganic salts
• 4. Greater content of large collagen fibres

Question: All factors govering dentine permeability EXCEPT_______________?

• 1. Smear layer
• 2. Fluid convection
• 3. Length of dentinal tubules
• 4. Diffusion coefficient

Question: The average diameter of coronal dentinal tubules near the pulp is____________?

• 1. 0.2-0.5 microns
• 2. 2-3 microns
• 3. 0.2-0.3 microns
• 4. 7 microns

Question: All of the following is true about dentinal tubules except______________?

• 1. Inner pulpal layer contains more dentinal tubules than outer dentin layer
• 2. The diameter of dentin tubules ranges from 5 to 7μm
• 3. The diameter of dentinal tubule is more at pulpal layer than outer layer
• 4. The bonding is more on the inner layer of dentin compared to outer surface

Question: S shape of dentinal tubules is due to______________?

• 1. Incremental deposition
• 2. Peritubular dentin
• 3. Crowding of odontoblasts
• 4. Due to excess amount of organic component

Question: Dentin formed through out the life is______________?

• 1. Sclerotic dentin
• 2. Secondary dentin
• 3. Reparative dentin
• 4. All of the above

Question: Dentinal tubules are calcified in_______________?

• 1. Sclerotic dentin
• 2. Primary dentin
• 3. Secondary dentin
• 4. Interglobular dentin

Question: Accentuated incremental lines in dentin due to disturbances in matrix and mineralization process is_____________?

• 1. Incremental lines of retzius
• 2. Incremental lines of vonebner
• 3. Contour lines of owen
• 4. None of the above

Question: Formula of hydroxyapatite crystal is____________?

• 1. Ca3 (Po4)2 CaCo3
• 2. 3Ca (Po4)2 Ca(OH)2
• 3. CaPo4 Ca(OH)2
• 4. None of the above