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Medical Mcqs/MCQs

Medical Mcqs – MCQs

5140 questions. Click to practice.

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1.Which of the following statements about enamel spindles is incorrect?

They are formed by ameloblastsThey are located near the cusp areasThey are encased within interprismatic enamelThey end in a rounded structure

2.What term describes the twisting and intertwining of enamel rods found at the cusps and incisal edges of a tooth?

Enamel spindlesGnarled enamelWoven incremental linesRetzius incremental linesPerikymata

3.What is the ratio of the diameter of enamel rods at the dentinoenamel junction (DEJ) compared to their diameter at the enamel surface?

1 to 41 to 11 to 22 to 1None of the above

4.What are enamel tufts characterized as?

Fine hair-like structures originating from the enamel surface near the dentin-enamel junctionTuft-shaped formations that start at the dentin-enamel junction and extend into the enamelExtensions of odontoblastic processes penetrating the enamel layerNone of these

5.Where is the enamel layer the thickest on the posterior teeth?

Cervical area on the cheek sideCentral portion of the cheek sideCentral portion of the tongue sideChewing (occlusal) surface

6.Perikymata represent the visible surface expression of which dental structure?

Enamel prismsLines of RetziusNasmyth's membraneDental pellicleNone of the above

7.Which of the following statements is incorrect?

The root resorption of primary incisors and canines starts on their lingual sides.Root resorption in primary molars initiates from their inner surfaces.The loss of primary teeth is postponed if their permanent successors are missing.All of the above statements are correct.

8.Which of the following statements about epithelial keratinization is accurate?

Non-keratinized epithelium lacks both the stratum granulosum and stratum corneum layers, with surface cells retaining their nuclei.Parakeratinized epithelium features superficial cells containing pyknotic nuclei and does not have a stratum granulosum layer.Orthokeratinized epithelium has a visible stratum granulosum, and its surface cells are anucleate.All the above statements are true.None of the above.

9.Which areas of the oral mucosa are characterized by elongated connective tissue papillae and a keratinized epithelial layer?

Gingiva and alveolar mucosaHard palate and gingivaBuccal mucosa and alveolar mucosaHard palate and soft palate

10.Which of the following areas is NOT covered by stratified squamous epithelium?

The lipsThe tongueThe roof of the soft palateThe oropharynx

11.Membrane coating granules are known to __________?

Present as round structures containing an amorphous center in keratinized epitheliumDerive from the Golgi apparatusContain bundles of tonofilamentsAssist in the attachment of fully keratinized epithelial cells

12.What are the main components of the basement membrane?

Includes lamina lucida and lamina duraComposed of luratihyaline granulesMade up of lamina densa and lamina lucidaContains desmosomes and hemidesmosomes

13.Which type of clear cell is predominantly found in the oral epithelium?

Pigment-producing melanocyteImmune system lymphocyteSensory Merkel cellAntigen-presenting Langerhans cell

14.Into which type of papilla do the von Ebner's glands secrete?

Foliate papillaeFiliform papillaeCircumvallate papillaeFungiform papillae

15.Which type of dendritic cell is found within the stratified squamous keratinized epithelium of the oral cavity?

Cells that produce keratinImmune cells involved in allergic reactionsPigment-producing dendritic cellsContractile epithelial cellsNone of the above

16.What is the name of the epithelial layer formed by reduced enamel after the crown has erupted?

Primary attachment epitheliumSecondary attachment epitheliumInitial enamel cuticleReduced enamel epithelium

17.Why does the vermilion border need to be moisturized frequently?

It has a higher concentration of sweat glandsIt possesses a greater number of oil-producing glandsIt has fewer sebaceous glands than other skin areasIt contains a reduced amount of sweat glandsIt is exposed to constant sunlight

18.Which of the following statements about stippling is correct?

It results from the alternating raised and lowered areas in the epithelium.It serves as a functional response to mechanical stress.It vanishes during advancing gingivitis because of edema, and this alteration can be reversed.All of the above are true.

19.Which of the following cells is not a keratinocyte?

Langhans cellRed blood cellLangerhans cellGrey cellMelanocyte

20.Which type of papilla is characterized by partial keratinization?

Fungiform papillaeFiliform papillaeCircumvallate papillaeFoliate papillae

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