Dental Caries MCQs

Option A: Gottlieb

Option B: Miller

Option C: Synder

Option D: Orland and Fizgerald

Correct Answer: Orland and Fizgerald ✔

Option A: Dextranase and soluble dextran

Option B: Insoluble dextan and glucosyl transferase

Option C: soluble dextan and glucosyl transferase

Option D: None of the above

Correct Answer: Insoluble dextan and glucosyl transferase ✔

Option A: Increase in plaque formation

Option B: Increase in calculus formation

Option C: Decrease in plaque formation

Option D: Causes precipitation of salivary proteins

Correct Answer: Decrease in plaque formation ✔

Option A: Enamel

Option B: Dentin

Option C: Pulp

Option D: Cementum

Correct Answer: Dentin ✔

Option A: Miller

Option B: G.V black

Option C: Gottlieb

Option D: Schwartz

Correct Answer: Miller ✔

Option A: low buffering capacity of acids

Option B: Medium buffering capacity for acids

Option C: High buffering capacity for acids

Option D: Independent of buffering capacity for acids

Correct Answer: High buffering capacity for acids ✔

Option A: Enamel spindles

Option B: Dentinoenamel junction

Option C: Enamel lamellae

Option D: Striae of Retzius

Correct Answer: Dentinoenamel junction ✔

Option A: Lactobacillus is main acusative organism in plaque

Option B: Smooth surface caries occur due to streptococcus mutans

Option C: Pit and Fissure caries can be prevented by using pit and tissue sealants

Option D: Fluorides help in reducing caries incidence

Correct Answer: Lactobacillus is main acusative organism in plaque ✔

Option A: Formation of large amount of acid

Option B: Availability of carbohydrate food

Option C: Viscosity of saliva

Option D: Localization of acid over tooth surface

Correct Answer: Localization of acid over tooth surface ✔

Option A: 1890

Option B: 1920

Option C: 1924

Option D: 1980

Correct Answer: 1890 ✔

Option A: Zone of bacterial invasion

Option B: Zone which can not be remineralized

Option C: Zone in which collagen is irreversibly denatured

Option D: Zone that need not be removed before restoration

Correct Answer: Zone that need not be removed before restoration ✔

Option A: Raw starch

Option B: Cooked starch

Option C: Sucrose

Option D: Fructose

Correct Answer: Raw starch ✔

Option A: Enamel cuticle

Option B: Interprismatic substance

Option C: Organic matrix

Option D: Enamel lamellae

Correct Answer: Interprismatic substance ✔

Option A: 4.3-4.5

Option B: 5.2-5.5

Option C: 4.9-5.1

Option D: 3.5-4.5

Correct Answer: 5.2-5.5 ✔

Option A: Glucose

Option B: Sucrose

Option C: Dextran

Option D: Polysaccharide

Correct Answer: Sucrose ✔

Option A: Zone of sclerosis, decalcification zone, bacterial invasion

Option B: Bacterial invasion, decalcification zone, zone of sclerosis

Option C: Zone of sclerosis, backterial invasion, decalcification zone

Option D: Decalcification zone, zone of scierosis, backterial invasion

Correct Answer: Bacterial invasion, decalcification zone, zone of sclerosis ✔

Option A: Streptococcus agalactiae

Option B: Streptococcus mutans

Option C: Streptococcus bovis

Option D: Streptococcus anginosus

Correct Answer: Streptococcus mutans ✔

Option A: Selenium

Option B: Vanadium

Option C: Strontium

Option D: Molybdenum

Correct Answer: Selenium ✔

Option A: Does not diffuse through plaque

Option B: Is rapidly hydrolysed in the mouth

Option C: Enhances remineralisation

Option D: Raises the PH in the oral cavity

Correct Answer: Does not diffuse through plaque ✔

Option A: only 1

Option B: only 2

Option C: 1 and 3

Option D: All of the above

Correct Answer: only 1 ✔

Option A: Fimbriae

Option B: Cilia

Option C: Flagella

Option D: Pseudopodia

Correct Answer: Fimbriae ✔

Option A: Physical form of sugar

Option B: Frequency of sugar intake

Option C: Ph of Plaque

Option D: Quantity of sugar intake

Correct Answer: Ph of Plaque ✔

Option A: Destructive potential of streptococcus mutans

Option B: Destructive potential of lactobacillus acidophilus

Option C: Lateral spread of caries along DE junction and weakening of the outer covering enamel

Option D: Mastectomy force and unrelated to the extent of carious process

Correct Answer: Lateral spread of caries along DE junction and weakening of the outer covering enamel ✔

Option A: Significant increase in number of oral bacteria

Option B: Shift towards more acidogenic microflora

Option C: Significant decrease in number of oral bacteria

Option D: Shift towards more aerobic microflora

Correct Answer: Shift towards more acidogenic microflora ✔

Option A: Streptococci

Option B: Lactobacilli

Option C: Veillonella

Option D: Bateroides

Correct Answer: Lactobacilli ✔

Option A: Microcosm

Option B: Pioneer bacteria

Option C: Advancing bacteria

Option D: Anaerobic bacteria

Correct Answer: Pioneer bacteria ✔

Option A: Rapid growth

Option B: Frequency of sucrose intake

Option C: Negligence in visiting the dentist

Option D: Carelessness in oral hygiene habits

Correct Answer: Frequency of sucrose intake ✔

Option A: Glucose

Option B: Fructose

Option C: Sucrose

Option D: Lactose

Correct Answer: Sucrose ✔

Option A: Exist regularly in the dental plaque

Option B: Produce extracellular amylopectins

Option C: Be lethal for gnotobiotic animals

Option D: Produce intracellular dextrans

Correct Answer: Exist regularly in the dental plaque ✔

Option A: Forms a gelatinous matrix

Option B: Metabolizes substrate from saliva

Option C: Derives energy from enamel constituents

Option D: Lives symbiolically with lactobacillus

Correct Answer: Forms a gelatinous matrix ✔

Option A: Maxillary 1st premolar

Option B: Maxillary 2nd molar

Option C: Mandibular 1st molar

Option D: Mandibular 2nd molar

Correct Answer: Mandibular 1st molar ✔

Option A: Base to base

Option B: Apex to base

Option C: Apex to apex

Option D: None of the above

Correct Answer: Apex to base ✔

Option A: Dental caries

Option B: Lichen planus

Option C: Herpes simplex

Option D: Syphilis

Correct Answer: Dental caries ✔

Option A: Actinomyces

Option B: Strep. mutans

Option C: Lactobacillus

Option D: Strep. viridans

Correct Answer: Strep. mutans ✔

Option A: S. Sarcinus

Option B: S. macae

Option C: S. sanguis

Option D: S. salivarius

Correct Answer: S. sanguis ✔

Option A: Proteolytic theory

Option B: Proteolytic chelation theory

Option C: Acidogenic theory

Option D: Autoimmune theory

Correct Answer: Acidogenic theory ✔

Option A: One

Option B: Two

Option C: Four

Option D: Five

Correct Answer: Five ✔

Option A: More than the patient with normal salivary flow

Option B: less than the patient with normal salivary flow

Option C: unaffected

Option D: None of the above

Correct Answer: More than the patient with normal salivary flow ✔

Option A: Mucopolysaccharide

Option B: Dextran-like glucan

Option C: Glycogen – like glucan

Option D: Amylopectin

Correct Answer: Dextran-like glucan ✔

Option A: Are the main causative agent

Option B: Can produce insoluble extracellular polysaccharides

Option C: Can attack to smooth enamel surfaces

Option D: Are secondary invaders

Correct Answer: Are secondary invaders ✔