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-Interglobular spaces:
a- Do not contain dentinal tubules.
b- Do not contain type I collagen.
c- Are formed during the course of globular mineralization.
d- Are seen only in secondary dentin.
2- Which would not be present in a ground section?
a- Inorganic crystals.
b-Odontoblast.
c- Interglobular space.
d- Dentinal tubules.
3- A major difference between secondary and primary dentine is that:
a- There is no predentine.
b- There is no hydroxyapatite.
c- There is no collagen fibers.
d- The dentinal tubules pass in wavier course through secondary dentine.
4- The interglobular dentin is found:.
a- Near the amelo-cemental junction.
b- In the root dentin.
c- Near the amelo-dentinal junction.
d- Near the dentino-cemental junction.
5- Which of the following is MOST likely to be found in the dentinal tubules:
a- Tomes' fibers.
b- Oxytalan fibers.
c- Tomes' process.
d- Thick collagen fibers.
6- Primary dentin differs from both secondary and reparative dentin in that:
a- Its matrix is calcified.
b- Its inorganic component is hydroxyapatite.
c- It usually has a greater number of tubules per unit area.
d- It is produced by mesenchymal cells.
7- Which of the following is not present within dentin?
a- Cell bodies.
b- Hydroxyapatite.
c- Collagen type I.
d- Incremental lines.
8- Which of the following is true of peritubular dentin ?It :
a- Is less mineralized than intertubular dentin.
b- May be considered as intratubular dentin.
c- Is best visualized in decalcified sections.
d- Is found in the interglobular dentin.
9- Which of the following is not present in odontoblasts?
a- Golgi saccules and vesicles.
b- Rough endoplasmic reticulum.
c- Desmosome-like junctions.
d- Numerous processes forming a striated border.
10- Human primary dentin contains:
a- Mantle & circumpulpal dentin.
b- Tomes' process.
c- Cell bodies.
d- Atubular dentin.
11- Which of the following is considered as age changes?
a- Transparent dentin.
b- Cellular cementum.
c- Primary dentin.
d- Enamel spindle.
12- Which of the following is true:
a- A layer of predentin is found between primary and secondary dentin.
b- Dentinal tubules do not pass through interglobular dentin.
c- The physiological secondary dentin contain dentinal tubules.
d- Many large collagenous fiber bundles are found in the dentinal tubules.
13- Reparative dentin:
a- Contain regular and numerous dentinal tubules.
b- Obliterates the apical foramen.
c- Forms on localized regions of the pulpal surface of the dentin.
d- Formation is induced by the cells of the inner dental epithelium.
14- Matrix vesicles are present during:
a- The initial mineralization of dentin.
b- The initial mineralization of enamel.
c- The initial mineralization of cementicles.
d- The initial mineralization of denticles.
15- Which of the following is least prominent in odontoblasts and secretory ameloblasts?
a- Rough endoplasmic reticulum.
b- Mitochondria.
c- Golgi apparatus.
d- Lysosomes.
16- Collagenous fibers are not found in:
a- Mantle dentin.
b- Reparative dentin.
c- The outer prismless layer.
d- The dental sac.
17- Obliteration of the dentinal tubules by mineral deposits:
a- Occurs only when the dentin becomes exposed to the oral fluids.
b- Produces dead tracts.
c- First occurs in predentin.
d- Is seen in sclerotic and transparent dentine.
18- Tome's granular layer is:
a- An extension of odontoblast processes into enamel.
b- A region lacking dentinal tubules.
c- Following the incremental lines.
d- Derived from the epithelial rests of Malassez.
19- Amelogenesis and dentinogenesis are similar in which respect?
a- Both processes involve the secretion of collagenous fibers
impregnation with hydroxy-apatite crystals.
b- Both processes involve maturation with hydroxyappatite crystals.
c- Both processes start simultaneously at the early crown stage.
d- Both processes continue throughout the life of the tooth.
20- Which of the following is wrong?
a- The formation of primary dentin continues throughout life.
b- Primary dentin contains a significantly higher number of tubules per unit
volume.
c- Reparative dentin forms as a response to injury.
d- Dead tracts are more common in secondary than in primary dentin.
21- Which of the following has the highest mineral content?
a- Predentin.
b- Peritubular dentin.
c- Intertubular dentin.
d- Cementum.
22-Dentin is a variety of Connective tissue because it:
a- is elastic and contains mucopolysaccharides.
b- contains collagen fibers and cell processes derived from mesenchyme.
c- contains inorganic cells.
d- has few cells and much intercellular material.
23-Cementum is a tissue that:
a- provides attachment of periodontal ligament fibers.
b- is easily resorbed than bone.
c- it contains blood vessels.
d- it contains neural receptors.
24-Cementum deposition cervically on enamel surface is due to:
a- premature degeneration of epithelial root sheath of Hertwig.
b- loss of reduced enamel epithelium.
c- persistence of epithelial root sheath of Hertwig.
d- cementoblasts coming from dental sac.
25-Neonal line is present in:
a- enamel and cementum. b- dentin and cementum.
c- enamel and dentin. d- non of the above.
26-Obliteration of dentinal tubules by minerals will result in:
a- formation of dead tracts.
b- formation of secondary dentin.
c- formation of sclerosed dentin.
d- formation of irregular or reparative dentin.
27-Age changes will increase:
a- dentin sclerosis. b- interglobular dentin.
c- in cementum thickness. d- Tome's granular layer.
28-formation of matrix vesicles in calcification of dentin is limited to:
a- circumpulpal dentin. b- Mantle dentin.
c- all types of dentin. d- non of the above.
Dentin-Complete:
1- .................. is the mineralized tissue that forms the bulk of the tooth.
2-Two major properties distinguish dentin from enamel: First, dentin is .......... Second, dentin ...................................
3- Dentin is slightly harder than...............or ............... and is less hard than ...................
4- On radiographs, dentin appears more .................. than enamel and more ..................... (lighter) than pulp.
6- The collagen of dentin comprises over 90% of the organic matrix. The principle collagen fibril is type ..................., traces of type III and type V collagen are also found.
7-........................... are highly specialized connective tissue cells that differentiate from the peripheral cellular layer of the dental papilla.
8- Secretory odontoblasts exhibit ...................... and ..................... activity along their plasma membranes.
9- The................. odontoblast produces dentin in a very slow rate.
10- In resting odontoblasts, there are increase in number and size of ............... and ........................
11- The Mantle dentin varying in width from ................ µm. The large collagen fibrils (0.1-0.2 mm in diameter) aggregate in the cell free zone.
12- The collagen fibrils of mantle dentin are aligned ...................... to the basal lamina, while in the mantle dentin of the root they are......................
13- ..................................theory proposes that fluid movement through the tubules distorts the local pulpal environment and is sensed by the free nerve endings in the plexus of Raschkow.
14- The ...................dentin is the basic structure of dentin and forms its bulk.
15- The collagen fibers of ......................... dentin are smaller in diameter (0.05Mm) and are more closely packed and interwoven with each other.
16- The fibers of circumpulpal dentin are present ............................. to the tubules.
17- The ground substances of the ....................... dentin are exclusively a product of odontoblasts.
18- The vesicles that bud from the odontoblast cells during mineralization of dentin are called ..............................
19- .............................theory supposes that dentin contains nerve endings, which respond when dentin is stimulated.
20- The function of .......................... is to provide a special micro-environment in which the first hydroxyappatite crystals can form.
21- the presence of matrix vesicles is limited to........................ dentin.
22- ....................... calcification founds in mantle dentin.
23-................................. calcification usually presents in circumpulpal dentin formed just below mantle dentin.
24- In the rest of the circumpulpal dentin, a combined pattern of calcification occurs with a ........................phase alternating with a .................... phase.
25- The convexity of the primary curvatures of dentinal tubules nearest the pulp chamber faces..........................
26- The ............................. result from the spiral track taken by the odontoblast during its course from the outer dentin surface to the pulp.
27- In some places of the crown, the peripheral ends of some odontoblastic processes cross the dentino-enamel junction and protrude into the enamel, forming ...............................
28- Dentin located between the dentinal tubules is called ......................................
29- ...................................dentin is type of highly calcified dentin matrix deposited on the internal surface of the walls of the dentinal tubules narrowing the size of the lumen.
30- .......................... dentin contains little amount of collagen. It is about 40% more mineralized than intertubular dentin.
31- External stimulus accelerates ..........................r dentin formation that eventually may obliterate the tubules spaces.
32- ......................... dentin will be seen as translucent rings in ground sections.
33-....................................... is the area of unmineralized or hypomineralized dentin where globular zones of mineralization have failed to fuse within mature dentin.
34- Inter-globular dentin is seen most frequently in the ........................ dentin just below the.................... dentin.
35- ................................. is a constant feature of the root dentin immediately adjacent to cementum.
36- .....................................do not follow any incremental pattern and usually smaller than interglobular dentin.
37-...............................do not cross through Tomes' granular layer.
38- Incremental lines of Von-Ebner run at right angles to..................................
39- ........................................... may results from a coincidence of the secondary curvatures between neighboring dentinal tubules.
40- ............................. could be seen in all deciduous teeth as well as in the mesio lingual cusp of the first permanent molar.
41- .................................... dentin develops by odontoblasts after root formation has been completed.
42- The reparative dentin with no tubules at all named ............................While that with trapped forming cells named .................................
43- ............................. is characterized by calcification of dentinal tubules, where the odontoblastic processes undergo fatty degeneration and then calcification.
44- ......................... dentin appears translucent when viewed by transmitted light while with reflected light these areas appear dark.
45- Dentin areas characterized by degenerated odontoblastic processes have been called ......................................
46- Each ...................... is surrounded and isolated by a narrow zone of sclerotic dentin.
47- ..........................may be caused in some teeth by the death of odontoblasts crowded in narrow pulpal horns.
48- ..................................... theory contends that a dental stimulus excites the odontoblastic process which then transmits the excitation to the adjacent nerve plexus
-Interglobular spaces:
a- Do not contain dentinal tubules.
b- Do not contain type I collagen.
c- Are formed during the course of globular mineralization.
d- Are seen only in secondary dentin.
2- Which would not be present in a ground section?
a- Inorganic crystals.
b-Odontoblast.
c- Interglobular space.
d- Dentinal tubules.
3- A major difference between secondary and primary dentine is that:
a- There is no predentine.
b- There is no hydroxyapatite.
c- There is no collagen fibers.
d- The dentinal tubules pass in wavier course through secondary dentine.
4- The interglobular dentin is found:.
a- Near the amelo-cemental junction.
b- In the root dentin.
c- Near the amelo-dentinal junction.
d- Near the dentino-cemental junction.
5- Which of the following is MOST likely to be found in the dentinal tubules:
a- Tomes' fibers.
b- Oxytalan fibers.
c- Tomes' process.
d- Thick collagen fibers.
6- Primary dentin differs from both secondary and reparative dentin in that:
a- Its matrix is calcified.
b- Its inorganic component is hydroxyapatite.
c- It usually has a greater number of tubules per unit area.
d- It is produced by mesenchymal cells.
7- Which of the following is not present within dentin?
a- Cell bodies.
b- Hydroxyapatite.
c- Collagen type I.
d- Incremental lines.
8- Which of the following is true of peritubular dentin ?It :
a- Is less mineralized than intertubular dentin.
b- May be considered as intratubular dentin.
c- Is best visualized in decalcified sections.
d- Is found in the interglobular dentin.
9- Which of the following is not present in odontoblasts?
a- Golgi saccules and vesicles.
b- Rough endoplasmic reticulum.
c- Desmosome-like junctions.
d- Numerous processes forming a striated border.
10- Human primary dentin contains:
a- Mantle & circumpulpal dentin.
b- Tomes' process.
c- Cell bodies.
d- Atubular dentin.
11- Which of the following is considered as age changes?
a- Transparent dentin.
b- Cellular cementum.
c- Primary dentin.
d- Enamel spindle.
12- Which of the following is true:
a- A layer of predentin is found between primary and secondary dentin.
b- Dentinal tubules do not pass through interglobular dentin.
c- The physiological secondary dentin contain dentinal tubules.
d- Many large collagenous fiber bundles are found in the dentinal tubules.
13- Reparative dentin:
a- Contain regular and numerous dentinal tubules.
b- Obliterates the apical foramen.
c- Forms on localized regions of the pulpal surface of the dentin.
d- Formation is induced by the cells of the inner dental epithelium.
14- Matrix vesicles are present during:
a- The initial mineralization of dentin.
b- The initial mineralization of enamel.
c- The initial mineralization of cementicles.
d- The initial mineralization of denticles.
15- Which of the following is least prominent in odontoblasts and secretory ameloblasts?
a- Rough endoplasmic reticulum.
b- Mitochondria.
c- Golgi apparatus.
d- Lysosomes.
16- Collagenous fibers are not found in:
a- Mantle dentin.
b- Reparative dentin.
c- The outer prismless layer.
d- The dental sac.
17- Obliteration of the dentinal tubules by mineral deposits:
a- Occurs only when the dentin becomes exposed to the oral fluids.
b- Produces dead tracts.
c- First occurs in predentin.
d- Is seen in sclerotic and transparent dentine.
18- Tome's granular layer is:
a- An extension of odontoblast processes into enamel.
b- A region lacking dentinal tubules.
c- Following the incremental lines.
d- Derived from the epithelial rests of Malassez.
19- Amelogenesis and dentinogenesis are similar in which respect?
a- Both processes involve the secretion of collagenous fibers
impregnation with hydroxy-apatite crystals.
b- Both processes involve maturation with hydroxyappatite crystals.
c- Both processes start simultaneously at the early crown stage.
d- Both processes continue throughout the life of the tooth.
20- Which of the following is wrong?
a- The formation of primary dentin continues throughout life.
b- Primary dentin contains a significantly higher number of tubules per unit
volume.
c- Reparative dentin forms as a response to injury.
d- Dead tracts are more common in secondary than in primary dentin.
21- Which of the following has the highest mineral content?
a- Predentin.
b- Peritubular dentin.
c- Intertubular dentin.
d- Cementum.
22-Dentin is a variety of Connective tissue because it:
a- is elastic and contains mucopolysaccharides.
b- contains collagen fibers and cell processes derived from mesenchyme.
c- contains inorganic cells.
d- has few cells and much intercellular material.
23-Cementum is a tissue that:
a- provides attachment of periodontal ligament fibers.
b- is easily resorbed than bone.
c- it contains blood vessels.
d- it contains neural receptors.
24-Cementum deposition cervically on enamel surface is due to:
a- premature degeneration of epithelial root sheath of Hertwig.
b- loss of reduced enamel epithelium.
c- persistence of epithelial root sheath of Hertwig.
d- cementoblasts coming from dental sac.
25-Neonal line is present in:
a- enamel and cementum. b- dentin and cementum.
c- enamel and dentin. d- non of the above.
26-Obliteration of dentinal tubules by minerals will result in:
a- formation of dead tracts.
b- formation of secondary dentin.
c- formation of sclerosed dentin.
d- formation of irregular or reparative dentin.
27-Age changes will increase:
a- dentin sclerosis. b- interglobular dentin.
c- in cementum thickness. d- Tome's granular layer.
28-formation of matrix vesicles in calcification of dentin is limited to:
a- circumpulpal dentin. b- Mantle dentin.
c- all types of dentin. d- non of the above.
Dentin-Complete:
1- .................. is the mineralized tissue that forms the bulk of the tooth.
2-Two major properties distinguish dentin from enamel: First, dentin is .......... Second, dentin ...................................
3- Dentin is slightly harder than...............or ............... and is less hard than ...................
4- On radiographs, dentin appears more .................. than enamel and more ..................... (lighter) than pulp.
6- The collagen of dentin comprises over 90% of the organic matrix. The principle collagen fibril is type ..................., traces of type III and type V collagen are also found.
7-........................... are highly specialized connective tissue cells that differentiate from the peripheral cellular layer of the dental papilla.
8- Secretory odontoblasts exhibit ...................... and ..................... activity along their plasma membranes.
9- The................. odontoblast produces dentin in a very slow rate.
10- In resting odontoblasts, there are increase in number and size of ............... and ........................
11- The Mantle dentin varying in width from ................ µm. The large collagen fibrils (0.1-0.2 mm in diameter) aggregate in the cell free zone.
12- The collagen fibrils of mantle dentin are aligned ...................... to the basal lamina, while in the mantle dentin of the root they are......................
13- ..................................theory proposes that fluid movement through the tubules distorts the local pulpal environment and is sensed by the free nerve endings in the plexus of Raschkow.
14- The ...................dentin is the basic structure of dentin and forms its bulk.
15- The collagen fibers of ......................... dentin are smaller in diameter (0.05Mm) and are more closely packed and interwoven with each other.
16- The fibers of circumpulpal dentin are present ............................. to the tubules.
17- The ground substances of the ....................... dentin are exclusively a product of odontoblasts.
18- The vesicles that bud from the odontoblast cells during mineralization of dentin are called ..............................
19- .............................theory supposes that dentin contains nerve endings, which respond when dentin is stimulated.
20- The function of .......................... is to provide a special micro-environment in which the first hydroxyappatite crystals can form.
21- the presence of matrix vesicles is limited to........................ dentin.
22- ....................... calcification founds in mantle dentin.
23-................................. calcification usually presents in circumpulpal dentin formed just below mantle dentin.
24- In the rest of the circumpulpal dentin, a combined pattern of calcification occurs with a ........................phase alternating with a .................... phase.
25- The convexity of the primary curvatures of dentinal tubules nearest the pulp chamber faces..........................
26- The ............................. result from the spiral track taken by the odontoblast during its course from the outer dentin surface to the pulp.
27- In some places of the crown, the peripheral ends of some odontoblastic processes cross the dentino-enamel junction and protrude into the enamel, forming ...............................
28- Dentin located between the dentinal tubules is called ......................................
29- ...................................dentin is type of highly calcified dentin matrix deposited on the internal surface of the walls of the dentinal tubules narrowing the size of the lumen.
30- .......................... dentin contains little amount of collagen. It is about 40% more mineralized than intertubular dentin.
31- External stimulus accelerates ..........................r dentin formation that eventually may obliterate the tubules spaces.
32- ......................... dentin will be seen as translucent rings in ground sections.
33-....................................... is the area of unmineralized or hypomineralized dentin where globular zones of mineralization have failed to fuse within mature dentin.
34- Inter-globular dentin is seen most frequently in the ........................ dentin just below the.................... dentin.
35- ................................. is a constant feature of the root dentin immediately adjacent to cementum.
36- .....................................do not follow any incremental pattern and usually smaller than interglobular dentin.
37-...............................do not cross through Tomes' granular layer.
38- Incremental lines of Von-Ebner run at right angles to..................................
39- ........................................... may results from a coincidence of the secondary curvatures between neighboring dentinal tubules.
40- ............................. could be seen in all deciduous teeth as well as in the mesio lingual cusp of the first permanent molar.
41- .................................... dentin develops by odontoblasts after root formation has been completed.
42- The reparative dentin with no tubules at all named ............................While that with trapped forming cells named .................................
43- ............................. is characterized by calcification of dentinal tubules, where the odontoblastic processes undergo fatty degeneration and then calcification.
44- ......................... dentin appears translucent when viewed by transmitted light while with reflected light these areas appear dark.
45- Dentin areas characterized by degenerated odontoblastic processes have been called ......................................
46- Each ...................... is surrounded and isolated by a narrow zone of sclerotic dentin.
47- ..........................may be caused in some teeth by the death of odontoblasts crowded in narrow pulpal horns.
48- ..................................... theory contends that a dental stimulus excites the odontoblastic process which then transmits the excitation to the adjacent nerve plexus
