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

Multiple choice

Triple rooted premaxillary teeth are found in ___________.

  1. homonidae

  2. ceboids

  3. anthropoid

  4. In all of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Triple-rooted premaxillary teeth (premaxilla with three tooth roots) is a dental characteristic found in anthropoids, which include monkeys, apes, and humans. This distinguishes them from other primate groups like ceboids (New World monkeys) and the family Hominidae as a broader category.

Multiple choice

Tooth in mammals develops from _______.

  1. endoderm

  2. ectodem

  3. mesoderm

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Teeth develop from the ectoderm layer (specifically neural crest cells of ectodermal origin) during embryonic development. The enamel organ comes from ectoderm. Endoderm forms internal organs, mesoderm forms muscles and connective tissue - neither gives rise to teeth.

Multiple choice

Independent part of face is not formed by ________ in Homo sapiens.

  1. pre maxilla

  2. palate

  3. maxillary suture

  4. maxilla
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Homo sapiens, the independent part of the face is not formed by the premaxilla, as the premaxilla fuses with the maxilla early in development. The palate, maxillary suture, and maxilla all contribute to facial formation. In humans, unlike some other vertebrates, the premaxilla is not an independent facial element.

Multiple choice

The stellate reticulum shows metaplastic changes in

  1. granular cell ameloblastoma

  2. basal cell type of ameloblastoma

  3. acanthomatous ameloblastoma

  4. desmoplastic ameloblastoma

  5. plexiform ameloblastoma
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The stellate reticulum shows metaplastic changes in acanthomatous ameloblastoma.

Multiple choice

Which of the following statements is/are true?

  1. A cold test indicates a vital pulp regardless of whether the pulp is normal or abnormal.

  2. A heat test is a test for pulp vitality.

  3. An improper response to heat indicates either the tooth has pulpal or periapical disease.

  4. The frozen carbon dioxide is not reliable method of cold pulp testing.

  5. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is correct statement.

Multiple choice

Cracked tooth syndrome can be effectively diagnosed by

  1. radiological examination

  2. subjective symptoms or horizontal percussion

  3. electric pulp testing

  4. thermal pulp testing

  5. palpation and vertical percussions
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cracked tooth syndrome can be effectively diagnosed by subjective symptoms or horizontal percussion.

Multiple choice

Which of the following statements is false about pulpitis?

  1. Irreversible pulpitis may be asymptomatic.

  2. In irreversible pulpitis, there is abnormal response to cold and more current is required in electric testing in advanced stages.

  3. Pulp polyp is less sensitive than pulp and more current is required.

  4. In reversible pulpitis, more response to cold and more current is required to elicit a response.

  5. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is an incorrect statement about pulpitis.

Multiple choice

Which of the following statements is/are false about internal resorption?

  1. Internal resorption is an idiopathic slow or fast progressive resorptive process occurring in the dentin of the pulp chamber or root canals of teeth.

  2. Internal resorption is the result of osteoclastic activity.

  3. Internal resorption in the root of a tooth is symptomatic.

  4. Only 1, 2 and 3

  5. Internal resorption in the root of tooth is asymptomatic.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is an incorrect statement about internal resorption because internal resorption in the root of tooth is asymptomatic. So, it is the correct answer.