Competitive Medical MCQs – Latest Enamel ( Oral Histology ) MCQs
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Latest Medical MCQs
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Latest Enamel ( Oral Histology ) Mcqs
The most occurred mcqs of Enamel ( Oral Histology ) in past papers. Past papers of Enamel ( Oral Histology ) Mcqs. Past papers of Enamel ( Oral Histology ) Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Enamel ( Oral Histology ) Mcqs. The Important series of Enamel ( Oral Histology ) Mcqs are given below:
Which of the following is correct?
A. Each ameloblast contributes to 4 different rods
B. Each rod is formed by 4 ameloblasts
C. Head of the rod is formed by one ameloblasts, and tail is formed by three other ameloblasts
D. All of the above
Enamel can act in a sense like a_______________?
A. Impermeable membrane
B. Permeable membrane
C. Semipermeable membrane
D. Infrapermeable membrane
Dark bonds that are present in enamel rods at intervals of 4 μms are______________?
A. Striae of Retzius
B. Cross striations
C. Neonantal bands
D. Hunter-Schregar bands
The average width of enamel rods is______________?
A. 2mm
B. 5mm
C. 10mm
D. 0.5mm
The shallow furrows on the enamel surface, where stria of Retzius end are known as _______________ ?
A. Pellicle
B. Cracks
C. perikymata
D. Enamel lamellae
The key hole, pattern appearance in the cross section is feature of______________?
A. Intertubular dentin
B. Prismatic enamel
C. Aprismatic enamel
D. Intratubular dentin
The class of low molecular weight calcium binding proteins seen predominantly in developing enamel are_____________?
A. Tuftelin
B. Amelogenin
C. Enamelin
D. Ameloplakin
Metalloprotienases are used in which stage of the amelogenesis_____________?
A. Protective
B. Formative/ Secretory
C. Organising
D. Desmolytic
Nutritional supply of the ameloblasts during most of their life cycle is from the_____________?
A. Odontoblastic processes
B. Dental pulp
C. Dental sac
D. Reduced dental organ
Neonatal line is also referred to as______________?
A. Line of cross striations
B. Retzius line
C. Incremental lines
D. Line of enamel tufts
Among the following the structure that is most calcified is_______________?
A. Enamel spindle
B. Enamel rod
C. Enamel lamella
D. Enamel tuft
Synthesis of enamel matrix proteins occurs in the________________?
A. Stratum intermedium
B. Ameloblast
C. Outer enamel epithelium
D. Stratum granulosum
Enamel is laid down______________?
A. Mainly by ameloblasts
B. Mainly by odontoblasts
C. Only on odontoblasts
D. Only by ameloblasts
The striking difference between enamel and other mineralized tissues is______________?
A. Presence of high percentage of organic matrix
B. Enamel has high reparative capacity
C. Presence of incremental lines
D. Most of organic component is lost during mineralization
Formation of dentin by odontoblasts begins in_______________?
A. Desmolytic stage
B. Organizing stage
C. Morphogenic stage
D. Formative stage
Chronological hypoplasia is_____________?
A. Hypoplasia of hereditary origin
B. Hypoplasia of systemic origin
C. Hypoplasia of local origin
D. None of the above
Dentino enamel junction is_________________?
A. Straight
B. Non-scalloped
C. Scalloped and the convexities are directed towards dentin
D. Scalloped and the convexities are directed towards enamel
True about direction of enamel rods______________?
A. In the cervical third of deciduous crowns they are almost horizontal in direction
B. They are almost vertical near the incisal edge (or) cusp tip areas
C. They originate at right angle to dentin surface
D. In cervical region of permanent teeth, they deviate in apical direction
E. All of the above
The diameter of the rod is______________?
A. 4 μ m
B. 7 μ m
C. 9 μ m
D. 2 μ m
Inorganic content of enamel is about______________?
A. 50%
B. 35%
C. 4%
D. 96%
calcification in enamel starts at____________?
A. Root
B. Enamel matrix
C. CEJ
D. DEJ
The enamel has no capacity of self repair because______________?
A. It is essentially a keratin tissue and has no blood vessels
B. Its formative cells are lost once it is completely formed
C. It has only a small percent of organic content
D. It has no direct connection with the active cells of the dental pulp
The formative cells of which of the following dental tissues disappear once tissue is formed___________?
A. Enamel
B. Periodontal ligament
C. Dentin
D. Cementum
On microscopic examination enamel rods have___________?
A. Key hole appearance in cross section
B. Lanullate appearance in cross-section
C. Paddle appearance in cross section
D. None of the above
All are true about the striae of retzius except___________?
A. They are areas of increased porosity
B. Have high inorganic content
C. Constitute the rest lines with in the enamel rods
D. Allow the movement of water and small ions
Ionic exchange between enamel surface and environment______________?
A. Stops after 2 years of eruption
B. Does not take place once enamel surface and environment
C. Continues till adult life
D. Continues through out life
Incremental lines of retzius are seen in______________?
A. Enamel
B. Cementum
C. Dentin
D. Pulp
Blunt cell processes seen on the developing ameloblasts are celled as________________?
A. Tomes fibres
B. Tomes processes
C. Tomes layer
D. Odontoblastic processes
Following is not an external manifestation of enamel________________?
A. Enamel tufts
B. Incremental lines of enamel
C. Enamel lamella
D. Enamel cuticle
Hunter Schreger band are____________?
A. Dark and light bands of enamel seen in longitudinal ground section
B. Dark and light brands of dentin seen in longitudinal section
C. Dark and light bands of enamel seen in horizontal ground section
D. Dark and light bands of dentin seen in horizontal
The percentage of inorganic matter in fully developed enamel is about____________?
A. 76%
B. 66%
C. 86%
D. 96%
Non acidic, nonionic protein which helps in enamel mineralization _______________?
A. Sheathlin
B. Tuftelin
C. Enamelin
D. Amelogenin
Which of the following is correct about enamel crystals ?
A. Contains organic portion in the center
B. Same as dentin crystals
C. Roughly texagonal in shape
D. Their diameter is about 5 microns in size
Maximum amount of phosphate is seen in_______________?
A. Gingiva
B. Enamel
C. Bone
D. Dentin
Neonatal lines are seen in_______________?
A. Enamel of deciduous incisiors
B. Enamel of premolars
C. Enamel of permanent incisors
D. Dentin of all teeth, as if is formed first
narled enamel is seen in_____________?
A. Cervical region of tooth
B. Proximal surface of tooth
C. Cusp tips of tooth
D. All of the above
The thickness of prismless enamel in diciduous teeth is______________?
A. 25 μ m
B. 75 μ m
C. 50 μ m
D. 100 μ m
Enamel rods at the cervical area at the occlusal edge and incisal lip in permanent teeth are______________?
A. Shallow
B. Straight
C. Bent
D. Curved
Incremental lines of Retzius appear_____________?
A. As lines in the enamel running at right angles to the enamel surface
B. In dentin and follow the appositional pattern
C. In enamel and follow the apposition pattern
D. As lines in the dentin running at right angles to the dentino-enamel junction
Enamel spindles are formed by______________?
A. Ameloblasts
B. Cracks
C. Odontoblasts
D. Hypocalcified rods
The small ridges, perikymata, seen on facial surfaces of canines are the result of_____________?
A. Hypoplacification
B. Hyperplasia
C. Normal development
D. Interstitial development
Ameloblasts is______________?
A. A cell from which tooth enamel is formed:
B. A tumour of the jaw
C. A tissue from which tooth erupts
D. Pertaining to dentin
Shape of enamel rod is______________?
A. Key hole or paddle shaped
B. Round
C. Square
D. None of the above
Moth eaten appearance of of enamel is seen in____________?
A. Odontodysplasia
B. Desmolytic stage
C. Amelogenisis stage
D. Mottled enamel
Hertwig’s root sheath is formed from______________?
A. Stellate reticulum
B. Stratum inter medium
C. Outer enamel epithelium
D. Cervical loop
Thin leaf like structures that extend from enamel surface in to DEJ are____________?
A. Enamel tufts
B. Enamel lamella
C. Enamel spindles
D. Perikymata
Which of the following statement is correct_________________?
A. The bodies of rods are near occlusal and incisal surfaces, where as the tails point cervically
B. In cross sections enamel rods appear hexagonal and resembles fish scales
C. The apatite crystals are parallel to bodies and deviate 65° from the tails
D. All of the above
Length of enamel rods is_____________?
A. Greater than the thickness of enamel
B. Equal to the thickness of enamal
C. Less than the thickness of enamel
D. None of the above
Specific gravity of enamel is_____________?
A. 2.8
B. 4.8
C. 3.8
D. 2.3
The type of fibrous element in enamel is_____________?
A. Collagen fibre
B. Keratin like fibre
C. Tono filament
D. Vimentin filament
Which of the following tissues have no reparative capacity______________?
A. Enamel
B. Cementum
C. Dentin
D. Periodontal ligament
Which of the following structures is not of ectodermal origin_______________?
A. Enamel tufts
B. Enamel spindles
C. Hunter schreger bands
D. Enamel lamellae
Neonatal lines are found in all of the following except____________?
A. Enamel and dentin of permanent first molars
B. Enamel of permanent canines
C. Enamel of primary incisors
D. Dentin of permanent mandibular incisors
Approximately how many enamel rods will be present in a maxillary molar ?
A. 7 million
B. 5 million
C. 9 million
D. 12 million
All are true regarding the enamel spindles except____________?
A. Produced by ameloblasts
B. Surrounded by inter prismatic enamel
C. Found in the region of cusps
D. Terminate as rounded process
Interwining of the enamel rods at the cusp timps and the incisal edges of a tooth is called______________?
A. Incremental lies of woven
B. Gnarled enamel
C. Enamel spindles
D. Incremental lines of retzius
Ratio of diameter of enamel rods in the DEJ to the enamel surface is______________?
A. 1:2
B. 1:1
C. 1:4
D. 2:1
Enamel tufts are_______________?
A. Odontoblastic processes extending into enamel
B. Tuft like structure arising from dentin-enamel junction towards enamel surface
C. Thin tuft like structure extending from enamel surface of dentin enamel junction
D. None of the above
The enamel of the posterior teeth is thickest at____________?
A. Middle third of buccal surface
B. Cervical third of buccal surface
C. Middle third of lingual surface
D. Occlusal surface
perikymata are the external surface manifestations of_____________?
A. Nasmyth’s membrane
B. Incremental lines of retzius
C. Enamel rods
D. Pellicle