Biology

Dental and Oral Biology

924 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

Multiple choice

Which of the following is the incorrect statement regarding the porosity in acrylic dentures?

  1. Gaseous porosity is seen in thicker portions due to volatilisation of the monomer.

  2. Pressure porosity is seen as diffuse and is due to inadequate pressure during flasking.

  3. Acrylic dentures are generally porous.

  4. Option1, 2 and 3 are correct statement regarding the porosity in acrylic dentures.

  5. Acrylic dentures are generally non-porous.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the incorrect statement regarding the porosity in acrylic dentures because acrylic dentures are generally porous.

Multiple choice

Apical surgery is least indicated in

  1. maxillary molars

  2. maxillary premolars

  3. mandibular molars

  4. mandibular premolars

  5. maxillary incisors
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Apical surgery is least indicated in mandibular premolars because of their proximity to the mental foramen.

Multiple choice

Which of the following statements is false about condensing osteitis?

  1. Condensing osteitis is the response to a low-grade, chronic inflammation of the periradicular area.

  2. Condensing osteitis is a mild irritation from pulpal disease that stimulates osteoblastic activity in the alveolar bone.

  3. Condensing osteitis is usually asymptomatic.

  4. Condensing osteitis is usually symptomatic.

  5. The mandibular posterior teeth are most frequently affected in condensing osteitis.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is an incorrect statement because condensing osteitis is usually asymptomatic.

Multiple choice

Which of the following statements is/are false about cleaning and shaping of the canal?

  1. Shaping of canal is done after cleaning the apical 1/3rd to ensure patency.

  2. Shaping facilitates placement of instruments to the working length by increasing the coronal taper.

  3. Shaping permits more accurate assessment of the apical cross-section diameter of the canal.

  4. Only 1, 2 and 3

  5. Shaping is necessary for more calcifications that occur from coronal portion to the apex.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is an incorrect statement about cleaning and shaping of the canal.

Multiple choice

Which of the following statements is false about balance force technique?

  1. A flex-R file is used in balance force technique.

  2. The coronal third of the canal is prepared using the crown-down technique in balance force technique.

  3. Rotate the uncurved file clockwise from 90 to 180 degrees with light apical pressure to engage dentin in balance force technique.

  4. Rotate the uncurved file clockwise from 180 to 270 degrees with light apical pressure to engage dentin in balance force technique.

  5. Balance force technique has shown to reduce canal transportation and ledging.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is an incorrect statement about balance force technique because rotating the uncurved file clockwise from 90 to 180 degrees with light apical pressure to engage dentin in balance force technique.

Multiple choice

Which of the following microorganisms is/are most commonly involved in failure of endodontically treated teeth due to extraradicular infection?

  1. Actinomyces israelii

  2. Propionibacterium propionicum

  3. Only 1 and 2

  4. Enterococcus faecalis

  5. Candida albicans
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Both Actinomyces israelii and Propionibacterium propionicum are most commonly involved in failure of endodontically treated teeth due to extraradicular infection.