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

The teeth forming cells are:

  1. odontoblast cells

  2. odontoclast cells

  3. chondroblast cells

  4. all of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Odontoblasts are specialized cells that produce dentin, the hard tissue beneath tooth enamel. They form the primary structure of teeth. Odontoclasts resorb tooth tissue, chondroblasts form cartilage - neither forms teeth.

Multiple choice

Monophyodont condition is present in:

  1. Platypus

  2. toothed whale

  3. both of these

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Monophyodont means having only one set of teeth throughout life. The platypus is monotreme with a single set, and toothed whales are born with teeth but lose them as adults. Both exemplify this condition.

Multiple choice

Human dentition has ______________ characteristics.

  1. acrodont and diphyodont

  2. homodont and thecodont

  3. thecodont and diphyodont

  4. polyphyodont and thecodont
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Humans have thecodont dentition (teeth set in bony sockets) and are diphyodont (two sets: milk teeth and permanent teeth). Acrodont describes crest-attached teeth in some reptiles, homodont means uniform teeth - neither applies to humans.

Multiple choice

What type of teeth do human beings have?

  1. Bunodont

  2. Lophodont

  3. Selenodont

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

Bunodont teeth have low, rounded cusps adapted for omnivorous diets. Human molars display this pattern. Lophodont has ridged cusps (horses), selenodont has crescent-shaped cusps (deer), epidermal refers to skin denticles in some fish.

Multiple choice

Roots are three in number in case of:

  1. lower molars

  2. upper molars

  3. lower premolars

  4. upper premolars
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Permanent upper molars (especially first and second) typically have three roots: two buccal and one lingual/palatal. Lower molars have two roots, premolars usually have one or two roots.

Multiple choice

Carnassial teeth are found in:

  1. herbivores

  2. carnivores

  3. omnivores

  4. detrivores
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carnassial teeth are specialized blade-like premolars or molars that shear flesh like scissors. They are characteristic of carnivores like cats and dogs. Herbivores have grinding molars, omnivores have mixed dentition, detrivores are not a standard dental category.

Multiple choice

Epidermal teeth are present in:

  1. cyclostomes

  2. anurans

  3. reptiles

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Epidermal teeth refer to tooth-like dermal structures (denticles) in various vertebrates. Cyclostomes have keratinized oral teeth, some anurans have denticles, and certain reptiles display similar dermal tooth structures - all represent forms of epidermal dentition.

Multiple choice

The most contagious of the oral papillary lesions is

  1. fibromatosis gingivae

  2. focal epithelial hyperplasia

  3. fordyce's granules

  4. benign migratory glossitis

  5. cheilitis granulomatosa
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Focal epithelial hyperplasia is the most contagious of the oral papillary lesions.