1 - All are true about the striae of retzius except___________?
1 - All are true about the striae of retzius except___________?
Have high inorganic content
2 - All are true regarding the enamel spindles except____________?
2 - All are true regarding the enamel spindles except____________?
Produced by ameloblasts
3 - Ameloblasts is______________?
3 - Ameloblasts is______________?
A cell from which tooth enamel is formed:
4 - Among the following the structure that is most calcified is_______________?
4 - Among the following the structure that is most calcified is_______________?
Enamel rod
5 - Approximately how many enamel rods will be present in a maxillary molar ?
5 - Approximately how many enamel rods will be present in a maxillary molar ?
12 million
6 - Blunt cell processes seen on the developing ameloblasts are celled as________________?
6 - Blunt cell processes seen on the developing ameloblasts are celled as________________?
Tomes fibres
7 - calcification in enamel starts at____________?
7 - calcification in enamel starts at____________?
DEJ
8 - Chronological hypoplasia is_____________?
8 - Chronological hypoplasia is_____________?
Hypoplasia of systemic origin
9 - Dark bonds that are present in enamel rods at intervals of 4 μms are______________?
9 - Dark bonds that are present in enamel rods at intervals of 4 μms are______________?
Cross striations
10 - Dentino enamel junction is_________________?
10 - Dentino enamel junction is_________________?
Scalloped and the convexities are directed towards dentin
11 - Enamel can act in a sense like a_______________?
11 - Enamel can act in a sense like a_______________?
Semipermeable membrane
12 - Enamel is laid down______________?
12 - Enamel is laid down______________?
Only by ameloblasts
13 - Enamel rods at the cervical area at the occlusal edge and incisal lip in permanent teeth are______________?
13 - Enamel rods at the cervical area at the occlusal edge and incisal lip in permanent teeth are______________?
Bent
14 - Enamel spindles are formed by______________?
14 - Enamel spindles are formed by______________?
Odontoblasts
15 - Enamel tufts are_______________?
15 - Enamel tufts are_______________?
Tuft like structure arising from dentin-enamel junction towards enamel surface
16 - Following is not an external manifestation of enamel________________?
16 - Following is not an external manifestation of enamel________________?
Enamel tufts
17 - Formation of dentin by odontoblasts begins in_______________?
17 - Formation of dentin by odontoblasts begins in_______________?
Organizing stage
18 - Hertwig's root sheath is formed from______________?
18 - Hertwig's root sheath is formed from______________?
Cervical loop
19 - Hunter Schreger band are____________?
19 - Hunter Schreger band are____________?
Dark and light bands of enamel seen in longitudinal ground section
20 - Incremental lines of Retzius appear_____________?
20 - Incremental lines of Retzius appear_____________?
In enamel and follow the apposition pattern
21 - Incremental lines of retzius are seen in______________?
21 - Incremental lines of retzius are seen in______________?
Enamel
22 - Inorganic content of enamel is about______________?
22 - Inorganic content of enamel is about______________?
0.96
23 - Interwining of the enamel rods at the cusp timps and the incisal edges of a tooth is called______________?
23 - Interwining of the enamel rods at the cusp timps and the incisal edges of a tooth is called______________?
Gnarled enamel
24 - Ionic exchange between enamel surface and environment______________?
24 - Ionic exchange between enamel surface and environment______________?
Continues through out life
25 - Length of enamel rods is_____________?
25 - Length of enamel rods is_____________?
Greater than the thickness of enamel
26 - Maximum amount of phosphate is seen in_______________?
26 - Maximum amount of phosphate is seen in_______________?
Enamel
27 - Metalloprotienases are used in which stage of the amelogenesis_____________?
27 - Metalloprotienases are used in which stage of the amelogenesis_____________?
Formative/ Secretory
28 - Moth eaten appearance of of enamel is seen in____________?
28 - Moth eaten appearance of of enamel is seen in____________?
Odontodysplasia
29 - narled enamel is seen in_____________?
29 - narled enamel is seen in_____________?
Cusp tips of tooth
30 - Neonatal line is also referred to as______________?
30 - Neonatal line is also referred to as______________?
Incremental lines
31 - Neonatal lines are found in all of the following except____________?
31 - Neonatal lines are found in all of the following except____________?
Enamel of permanent canines
32 - Neonatal lines are seen in_______________?
32 - Neonatal lines are seen in_______________?
Enamel of deciduous incisiors
33 - Non acidic, nonionic protein which helps in enamel mineralization _______________?
33 - Non acidic, nonionic protein which helps in enamel mineralization _______________?
Amelogenin
34 - Nutritional supply of the ameloblasts during most of their life cycle is from the_____________?
34 - Nutritional supply of the ameloblasts during most of their life cycle is from the_____________?
Dental sac
35 - On microscopic examination enamel rods have___________?
35 - On microscopic examination enamel rods have___________?
Key hole appearance in cross section
36 - perikymata are the external surface manifestations of_____________?
36 - perikymata are the external surface manifestations of_____________?
Incremental lines of retzius
37 - Ratio of diameter of enamel rods in the DEJ to the enamel surface is______________?
37 - Ratio of diameter of enamel rods in the DEJ to the enamel surface is______________?
0.042361111111
38 - Shape of enamel rod is______________?
38 - Shape of enamel rod is______________?
Key hole or paddle shaped
39 - Specific gravity of enamel is_____________?
39 - Specific gravity of enamel is_____________?
2.8
40 - Synthesis of enamel matrix proteins occurs in the________________?
40 - Synthesis of enamel matrix proteins occurs in the________________?
Ameloblast
41 - The average width of enamel rods is______________?
41 - The average width of enamel rods is______________?
5mm
42 - The class of low molecular weight calcium binding proteins seen predominantly in developing enamel are_____________?
42 - The class of low molecular weight calcium binding proteins seen predominantly in developing enamel are_____________?
Amelogenin
43 - The diameter of the rod is______________?
43 - The diameter of the rod is______________?
4 μ m
44 - The enamel has no capacity of self repair because______________?
44 - The enamel has no capacity of self repair because______________?
Its formative cells are lost once it is completely formed
45 - The enamel of the posterior teeth is thickest at____________?
45 - The enamel of the posterior teeth is thickest at____________?
Occlusal surface
46 - The formative cells of which of the following dental tissues disappear once tissue is formed___________?
46 - The formative cells of which of the following dental tissues disappear once tissue is formed___________?
Enamel
47 - The key hole, pattern appearance in the cross section is feature of______________?
47 - The key hole, pattern appearance in the cross section is feature of______________?
Prismatic enamel
48 - The percentage of inorganic matter in fully developed enamel is about____________?
48 - The percentage of inorganic matter in fully developed enamel is about____________?
0.96
49 - The shallow furrows on the enamel surface, where stria of Retzius end are known as _______________ ?
49 - The shallow furrows on the enamel surface, where stria of Retzius end are known as _______________ ?
perikymata
50 - The small ridges, perikymata, seen on facial surfaces of canines are the result of_____________?
50 - The small ridges, perikymata, seen on facial surfaces of canines are the result of_____________?
Normal development
51 - The striking difference between enamel and other mineralized tissues is______________?
51 - The striking difference between enamel and other mineralized tissues is______________?
Most of organic component is lost during mineralization
52 - The thickness of prismless enamel in diciduous teeth is______________?
52 - The thickness of prismless enamel in diciduous teeth is______________?
25 μ m
53 - The type of fibrous element in enamel is_____________?
53 - The type of fibrous element in enamel is_____________?
Keratin like fibre
54 - Thin leaf like structures that extend from enamel surface in to DEJ are____________?
54 - Thin leaf like structures that extend from enamel surface in to DEJ are____________?
Enamel lamella
55 - True about direction of enamel rods______________?
55 - True about direction of enamel rods______________?
All of the above
56 - Which of the following is correct about enamel crystals ?
56 - Which of the following is correct about enamel crystals ?
Roughly texagonal in shape
57 - Which of the following statement is correct_________________?
57 - Which of the following statement is correct_________________?
All of the above
58 - Which of the following statement is false______________?
58 - Which of the following statement is false______________?
None of the above
59 - Which of the following structures is not of ectodermal origin_______________?
59 - Which of the following structures is not of ectodermal origin_______________?
Enamel spindles
60 - Which of the following tissues have no reparative capacity______________?
60 - Which of the following tissues have no reparative capacity______________?
Enamel
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