Biology
Dental and Oral Biology
967 Questions
Dental and Oral Biology focuses on the structure, development, and function of teeth and oral tissues. It covers key concepts like dental formulas, tooth eruption, and common oral diseases. These topics are essential for medical and biology entrance examinations.
Dental formulaTooth anatomyMilk teethOral diseasesTooth decay
Dental and Oral Biology Questions
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Neurofibromatosis
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Fibrous dysplasia
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Option 1 and 2
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Periapical granuloma
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Apical periodontal cyst
C
Correct answer
Explanation
This is the correct answer.
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Median rhomboid glossitis
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Abnormally fissured tongue
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White spongy nevus
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Black hairy tongue
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All of the above
B
Correct answer
Explanation
Abnormally fissured tongue is the most common developmental disorder affecting the tongue.
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soft
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firm and resilient
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hard
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firm and leathery
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hard and leathery
B
Correct answer
Explanation
Normal consistency of gingiva is firm and resilient.
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Attached gingiva is stippled.
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Loss of stippling is reversible.
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Loss of stippling is a common sign of gingival disease.
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Stippling is seen on only attached gingiva.
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All of the above
E
Correct answer
Explanation
All of the above statements are true.
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With the increase in age, keratinization of gingiva increases.
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With the increase in age, keratinization of gingiva decreases.
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With the increase in age, width of the attached gingiva increases.
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With the increase in age, number of elastic fibers in the periodontal ligament increases.
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Keratinization of gingiva is maximum on hard palate.
A
Correct answer
Explanation
This is not true statement.
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Acellular afibrillar cementum
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Cellular intrinsic fiber cementum
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Both 1 and 2
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Acellular extrinsic fiber cementum
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Cellular mixed stratified cementum
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Keratinosomes
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Melanocytes
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Merkel cells
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Langerhans cells
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Polymorphonuclear leukocytes
D
Correct answer
Explanation
Langerhans cells are dendritic cells located at suprabasal layers.
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Merkel cells
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Keratinosomes
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Melanocytes
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Langerhans cells
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Both 1 and 3
B
Correct answer
Explanation
Keratinosomes take part in destruction of organelle's membrane.
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3.5 - 4.5 mm
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3.3 - 3.9 mm
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1.9 mm
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1.8 mm
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None of the above
A
Correct answer
Explanation
This is the correct answer.
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NUG
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NUP
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NOMA
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Necrotizing stomatitis
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All of the above
B
Correct answer
Explanation
According to Horning and Cohen staging of oral necrotizing disease, stage 3 represents NUP.
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transseptal fibres
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alveolar crest fibres
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oblique fibres
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horizontal fibres
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apical fibres
C
Correct answer
Explanation
Oblique fibres run from cementum to alveolar bone in coronal direction.
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Class I
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Class II
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Class III
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Class IV
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Both 1 and 2
D
Correct answer
Explanation
Class IV : Recession extends beyond mucogingival junction with severe soft tissue and bone loss.
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Type I collagen
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Type II collagen
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Type III collagen
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Type IV collagen
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Type V collagen
A
Correct answer
Explanation
Type I collagen is present in principal fibres of periodontal ligament.
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Internal basal lamina
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External basal lamina
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Hemidesmosomes
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Enamel cuticle
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Nasmyth's membrane
B
Correct answer
Explanation
The junctional epithelium is attached to the gingival connective tissue by external basal lamina.
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Grade I furcation involvement
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Grade II furcation involvement
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Grade III furcation involvement
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Grade IV furcation involvement
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Grade II and Grade III furcation involvement
A
Correct answer
Explanation
Grade I furcation involvement : Incipient lesions