Oral Histology MCQs

Option A: Cell degenerated zone

Option B: Cell rich zone

Option C: Cell regenerated zone

Option D: cell free zone

Correct Answer: cell free zone ✔

Option A: Nutritive

Option B: Production of dentin

Option C: Production of enamel

Option D: Vascular supply to the teeth

Correct Answer: Production of dentin ✔

Option A: Formation of dentin

Option B: Nerve supply to dentin

Option C: Sends impulses to CNS

Option D: Nerve supply to enamel through fibres

Correct Answer: Nerve supply to enamel through fibres ✔

Option A: Collagen fibres

Option B: Haversian fibres

Option C: Non-myelinated nerve fibres

Option D: Reticulum

Correct Answer: Haversian fibres ✔

Option A: Volkmann canals

Option B: Canals of Hirchfeld and Zuckerland

Option C: Herversian canals

Option D: Gubernacular canals

Correct Answer: Gubernacular canals ✔

Option A: Cortical

Option B: Cancellous

Option C: Osteophytics

Option D: Exophytic

Correct Answer: Cortical ✔

Option A: 0.10 mm

Option B: 0.50 mm

Option C: 0.25 mm

Option D: 0.75 mm

Correct Answer: 0.25 mm ✔

Option A: 0.25 mm in thickness

Option B: 0.5 mm in thickness

Option C: 0.75 mm in thickness

Option D: mm in thickness

Correct Answer: 0.25 mm in thickness ✔

Option A: Cells of dental follicle

Option B: Cells of odontogenic layer

Option C: Cementoblasts

Option D: Cells of the gingiva

Correct Answer: Cells of dental follicle ✔

Option A: Cervical third

Option B: Apical third

Option C: Fulcrum of rotation

Option D: It has uniform width

Correct Answer: Fulcrum of rotation ✔

Option A: Gingiva

Option B: Periodontal ligament

Option C: Alveolar bone

Option D: Cementum

Correct Answer: Periodontal ligament ✔

Option A: Type I collagen

Option B: Type I and Type III collagen

Option C: Type I and Type II collagen

Option D: Type I and Type IV collagen

Correct Answer: Type I and Type III collagen ✔

Option A: Lacunae

Option B: Coupling

Option C: Reversal lines

Option D: Canaliculi

Correct Answer: Coupling ✔

Option A: Gingivodental

Option B: Cemental fibres

Option C: Horizontal fibres

Option D: Transseptal fibres

Correct Answer: Transseptal fibres ✔

Option A: Hertwig’s root sheath

Option B: Epithelial rests of malassez

Option C: Alveolar bone

Option D: Dental follicle

Correct Answer: Dental follicle ✔

Option A: Type II collagen fibres

Option B: Oxytalan fibres

Option C: Elastic fibres

Option D: Type I collagen fibres

Correct Answer: Type I collagen fibres ✔

Option A: Transseptal

Option B: Horizontal

Option C: Oblique

Option D: Apical

Correct Answer: Transseptal ✔

Option A: Horizontal

Option B: Transeptal

Option C: Apical

Option D: Oblique

Correct Answer: Oblique ✔

Option A: Alveolar sockets

Option B: Cementum

Option C: Gubernacular cords

Option D: Periodontal membrane

Correct Answer: Periodontal membrane ✔

Option A: Dentogingival

Option B: Transeptal

Option C: Oblique

Option D: Horizontal

Correct Answer: Oblique ✔

Option A: Sharpey’s fibres

Option B: Tomes fibres

Option C: Elastic fibres

Option D: Ray’s fibres

Correct Answer: A. Sharpey’s fibres ✔

Option A: Gingiva, cementum and alveolar bone

Option B: Gingiva and cementum

Option C: Cementum and periodontal ligament

Option D: Peridontal ligament the cementum and the alveolar bone

Correct Answer: Peridontal ligament the cementum and the alveolar bone ✔

Option A: Increased fibroplasia

Option B: Increased vascularity

Option C: Increased thickness

Option D: Decreased in number of cementicles

Correct Answer: Increased fibroplasia ✔

Option A: Triple pleated sheath

Option B: Mostly contains glycine residues

Option C: Exhibit cross striations at 64 μm

Option D: Intracellular in nature

Correct Answer: Intracellular in nature ✔

Option A: Horizontal

Option B: Oblique

Option C: Alveolar crest

Option D: Transseplat

Correct Answer: Transseplat ✔

Option A: The number or organelles

Option B: Presence of actin fibres and shape change

Option C: size of the cells

Option D: Collagen fibre formation

Correct Answer: Presence of actin fibres and shape change ✔

Option A: 6 weeks

Option B: 10 weeks

Option C: 18 weeks

Option D: 16 weeks

Correct Answer: 10 weeks ✔

Option A: Avascular

Option B: Devoid of nervous tissue

Option C: Avascular & deviod of nervous tissue

Option D: None of the above

Correct Answer: Avascular ✔

Option A: Due to deposition of cementum and bone

Option B: Down growths of gingival epithelium

Option C: Gingival cysts formed from cell rests

Option D: Reversal of function of horizontal and oblique fibres

Correct Answer: Due to deposition of cementum and bone ✔

Option A: Prevent extrusion

Option B: Prevent rotation

Option C: Maintains the mesiodistal width

Option D: All of the above

Correct Answer: Maintains the mesiodistal width ✔

Option A: Dental pulp

Option B: Lamina propria

Option C: Odontogenic epithelium

Option D: Vestibular lamina

Correct Answer: Odontogenic epithelium ✔

Option A: Trans-septal

Option B: Horizontal

Option C: Oblique

Option D: Apical

Correct Answer: Oblique ✔

Option A: Monocytes are precursor cells of osteoclasts

Option B: The plasma membrane of osteoclasts adjacent to bone that is being resorbed is known as striated or ruffled border

Option C: Contain lysosomes with acid phosphates

Option D: All of the above are true

Correct Answer: All of the above are true ✔

Option A: Bone

Option B: Periosteum

Option C: Periodontal ligament

Option D: All of the above

Correct Answer: Bone ✔

Option A: Gingival

Option B: Oblique

Option C: Horizontal

Option D: Transseptal

Correct Answer: Gingival ✔

Option A: Cementicles

Option B: Osteoblasts

Option C: Cementoclasts

Option D: Osteoclasts

Correct Answer: Cementicles ✔

Option A: Alveolar bone proper

Option B: Bundle bone

Option C: Lamellar bone

Option D: Cortical bone

Correct Answer: Bundle bone ✔

Option A: Chondroblasts

Option B: Odontoblasts

Option C: Osteoblasts

Option D: Fibroblasts

Correct Answer: Fibroblasts ✔

Option A: Lamina dura

Option B: Bundle bone

Option C: Lamina propria

Option D: Lamina densa

Correct Answer: Bundle bone ✔

Option A: Cementum

Option B: PDL

Option C: Pulp

Option D: Dentin

Correct Answer: PDL ✔

Option A: Greatest in the middle-third of a single rotted tooth

Option B: Greatest in the middle-third of a multirooted tooth

Option C: A net like plexus that runs closer to the cementum than to the bone

Option D: A net like plexus that runs closer to the bone than to the cementum

Correct Answer: A net like plexus that runs closer to the bone than to the cementum ✔

Option A: Fibroblasts

Option B: Multi totipotent cells

Option C: Cementoblasts

Option D: Cell rests of malassez

Correct Answer: Cell rests of malassez ✔

Option A: Gingiva

Option B: Alveolar bone

Option C: Periodontal ligament

Option D: Cementum

Correct Answer: Periodontal ligament ✔

Option A: Type V and VII collagen

Option B: Type I and III collagen

Option C: Type IV collagen

Option D: Type IV and III Collagen

Correct Answer: Type V and VII collagen ✔

Option A: Derives its blood supply primarily from the branches of vessels entering the pulp

Option B: Has a slow rate of turn over

Option C: Contains epithelial cells

Option D: Comprises primarily of type II collagen

Correct Answer: Contains epithelial cells ✔

Option A: Bone

Option B: Dentin

Option C: Cementum

Option D: Pulp

Correct Answer: Cementum ✔

Option A: Cementoid

Option B: Incremental line

Option C: Cellular cementum

Option D: Acellular cementum

Correct Answer: Cementoid ✔

Option A: Cellular cementum

Option B: Acellular cementum

Option C: Intermediate cementum

Option D: All of the above

Correct Answer: Cellular cementum ✔

Option A: Hyperplasia of cementum

Option B: Hypertrophy of cementum

Option C: Resorption of cementum

Option D: None of the above

Correct Answer: Resorption of cementum ✔

Option A: 55 to 60%

Option B: 60 to 65%

Option C: 65 to 70%

Option D: 70 to 75%

Correct Answer: 60 to 65% ✔

Option A: Avascular

Option B: Vascular

Option C: Has blood supply initially only

Option D: None of the above

Correct Answer: Avascular ✔

Option A: Hyperplasia

Option B: Hypoplasia

Option C: Hypertrophy

Option D: Excementoses

Correct Answer: Hyperplasia ✔

Option A: Does not exhibit features of either dentin of cementum

Option B: Predominantly seen in apical tow thirds of roots of molars and premolars and is rare in incisors or deciduous teeth

Option C: Represents area of entrapment of hertwig’s sheath in dentin or cementum

Option D: All of the above are correct

Correct Answer: All of the above are correct ✔

Option A: Cellular cementum

Option B: Acellular cementum

Option C: Both of the above

Option D: None of the above

Correct Answer: Cellular cementum ✔

Option A: Enamel meet cementum at a point

Option B: Enamel overlaps cementum

Option C: Cementum overlaps enamel

Option D: Both never meet

Correct Answer: Enamel overlaps cementum ✔

Option A: Dental cementum

Option B: Dental pulp

Option C: Enamel

Option D: Dentin

Correct Answer: Dental cementum ✔

Option A: Cervical third of the root

Option B: Middle third of the root

Option C: Apical third of the root

Option D: No secondary cementum forms

Correct Answer: Apical third of the root ✔

Option A: Sharpehy’s fibres and elastic fibres

Option B: Collagen fibres and blood vessels

Option C: Canaliculi and incremental lines

Option D: Lacunae and elastic fibres

Correct Answer: Canaliculi and incremental lines ✔

Option A: First formed cementum

Option B: Less calcified than acellular type

Option C: More calcified than acellular type

Option D: Less irregular

Correct Answer: Less calcified than acellular type ✔

Option A: Periodontal ligament

Option B: Alveolar bone

Option C: Cementum

Option D: Longbones

Correct Answer: Alveolar bone ✔

Option A: Less than dentin

Option B: More than dentin

Option C: Equal dentin

Option D: None of the above

Correct Answer: Less than dentin ✔

Option A: Forms during root formation

Option B: Forms after the eruption of the tooth

Option C: Seen at the coronal portion of the tooth

Option D: Formation is a slow process

Correct Answer: Forms after the eruption of the tooth ✔

Option A: Twisted

Option B: Curved

Option C: Pulp chamber

Option D: Lateral canal

Correct Answer: Pulp chamber ✔

Option A: Highly defined cellular zone near cemento – dentinal junction (CDJ)

Option B: Highly defined fibrillar zone near CDJ

Option C: Poorly defined zone near cemento-dentinal junction

Option D: Both a and B

Correct Answer: Poorly defined zone near cemento-dentinal junction ✔

Option A: 45 to 50%

Option B: 50 to 55%

Option C: 55 to 60%

Option D: 60 to 65%

Correct Answer: 45 to 50% ✔

Option A: Middle

Option B: Coronal

Option C: Apical

Option D: Interradicular

Correct Answer: Middle ✔

Option A: Cementum is thinnest at CEJ (20-50μm)

Option B: Cementum is thickest towards the apex (150-200μm)

Option C: The apical foramen is surrounded by cementum

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Anatomic repair

Option B: Functional repair

Option C: Physiological repair

Option D: Hyperplasia

Correct Answer: Anatomic repair ✔

Option A: Between enamel and cementum

Option B: Found at dentinocemental junction

Option C: Apical third

Option D: Coronal third

Correct Answer: Found at dentinocemental junction ✔

Option A: Cementum is more resistant to resorption than bone

Option B: Bone is more resistant to resorption than cementum

Option C: Both are equally resorbable

Option D: None of the above

Correct Answer: Cementum is more resistant to resorption than bone ✔

Option A: Ankylosis

Option B: Resorption of cementum

Option C: Hypertrophy of cementum

Option D: Hyperplasia of cementum

Correct Answer: Hyperplasia of cementum ✔

Option A: Ankylosis may occur

Option B: Exforliation of teeth occur

Option C: Delayed eruption

Option D: No change occurs

Correct Answer: Exforliation of teeth occur ✔

Option A: The uncalcified matrix of cementum is called cementoid

Option B: Cementum contain type I collagen predominantly

Option C: Cementodentinal junction is sometimes scallopes in deciduous teeth and smooth in permanent teeth

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Coronal half of root

Option B: Apical half of root

Option C: Apex of root

Option D: Entire root

Correct Answer: Coronal half of root ✔

Option A: Cementum meets enamel

Option B: Cementum overlaps enamel

Option C: Cementum does not meet enamel

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Less than bone

Option B: More than bone

Option C: Equal to that of bone

Option D: More than that of enamel

Correct Answer: Less than bone ✔

Option A: 10%

Option B: 30%

Option C: 60%

Option D: 90%

Correct Answer: 30% ✔

Option A: Is derived from the sheath of hertwig

Option B: Is acellular in the apical third of the tooth

Option C: Often overlaps the enamel

Option D: Does not contain collagen fibres

Correct Answer: Often overlaps the enamel ✔

Option A: Reparative dentin is characterized by having fewer and more twisted tubules than normal dentin and may include odontoblasts

Option B: Dead tracts appear black in transmitted and white in reflected ligth

Option C: Sclerotic transparent dentin appears transparent or light in transmitted light and dark in reflected light

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Are found in mantle dentin

Option B: Contain collagen

Option C: Produce alkaline phosphatase

Option D: Inhibit mineralization

Correct Answer: Are found in mantle dentin ✔

Option A: Collagen fibers are oriented perpendicular to DEJ

Option B: Vonkorff fibers are present

Option C: Contain phosphophoryn

Option D: Requires matrix vesicle for mineralization

Correct Answer: Contain phosphophoryn ✔

Option A: Transduction theory

Option B: Direct neural stimulation

Option C: Hydrodynamic theory

Option D: Hydrostatic theory

Correct Answer: Hydrodynamic theory ✔

Option A: Predentin

Option B: Mantle dentin

Option C: Interglobular dentin

Option D: Tertiary dentin

Correct Answer: Mantle dentin ✔

Option A: Third power of the diameter

Option B: Sixth power of the diameter

Option C: Square of the diameter

Option D: Fourth power of the diameter

Correct Answer: Fourth power of the diameter ✔

Option A: Primary and secondary dentin

Option B: Secondary dentin and circumpulpal dentin

Option C: Tetiary dentin and sclerotic dentin

Option D: All of the above

Correct Answer: Tetiary dentin and sclerotic dentin ✔

Option A: Enamel is harder than dentine

Option B: Enamel has no cells

Option C: Ameloblast secrete enamel and dentine

Option D: Odontoblast produce dentin

Correct Answer: Ameloblast secrete enamel and dentine ✔

Option A: Sclerotic dentin

Option B: Mantal dentin

Option C: Interglobular dentin

Option D: Intertubular dentin

Correct Answer: Sclerotic dentin ✔

Option A: Enamel

Option B: Dentin

Option C: Cementum

Option D: Bone

Correct Answer: Dentin ✔

Option A: Direct neural stimulation

Option B: Fluid or hydrodynamic theory

Option C: Transduction theory

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Inter tubular dentin

Option B: Peritubular dentin

Option C: Circum pulpal dentin

Option D: Secondary dentin

Correct Answer: Circum pulpal dentin ✔

Option A: Incineration/organic chelation

Option B: Decalcification

Option C: Devitrification

Option D: Combustion

Correct Answer: Incineration/organic chelation ✔

Option A: Pulp

Option B: Dentin

Option C: Enamel

Option D: Cementum

Correct Answer: Dentin ✔

Option A: Caries susceptible

Option B: Insensitive

Option C: Hypersensitive

Option D: Resistant to caries

Correct Answer: Resistant to caries ✔

Option A: Failure of coalescence of calcospherities

Option B: Fracture of the dentin

Option C: Artifact in light microscopy

Option D: Disturbance in dentinal tubules

Correct Answer: Failure of coalescence of calcospherities ✔

Option A: Peritubular dentin

Option B: Mantle dentin

Option C: Inter tubular dentin

Option D: Predentin

Correct Answer: Inter tubular dentin ✔

Option A: With out but not with in the dentin

Option B: Odontoblastic processes in dental tubules

Option C: Type of sharpey’s fibres

Option D: Originate from tome’s granular layer

Correct Answer: Odontoblastic processes in dental tubules ✔

Option A: Mantle dentin

Option B: Secondary dentin

Option C: Reactionary dentin

Option D: Indeed dermal tubules

Correct Answer: Mantle dentin ✔

Option A: Sclerotic dentin

Option B: Mantle dentin

Option C: Predentin

Option D: Osteodentin

Correct Answer: Osteodentin ✔

Option A: Lamina propria

Option B: Lamina lucida

Option C: Lamina limitans

Option D: Lamina densa

Correct Answer: Lamina limitans ✔

Option A: Cementoblasts

Option B: Fibroblasts

Option C: Odontoblasts

Option D: Osteoblasts

Correct Answer: Odontoblasts ✔