Oral Pathology & Medicine Mcqs - Set 12

1)   True ankyloglossia occurs as a result of________________?

a. Union between tongue and floor of mouth
b. Absence of lingual frenum
c. Lingual frenum attached to the tip of tongue
d. Short lingual frenum
Answer  Explanation 

ANSWER: Union between tongue and floor of mouth

Explanation:
No explanation is available for this question!


2)   Teeth that erupt with in 30 days of birth are called________________?

a. Natal teeth
b. Neonatal teeth
c. Primary teeth
d. Prenatal teeth
Answer  Explanation 

ANSWER: Neonatal teeth

Explanation:
No explanation is available for this question!


3)   The syndrom which consists of cleft palate micrognathia and glossoptosis is known as_____________?

a. Marfan’s syndrome
b. Crouzon’s syndrome
c. Paget’s disease
d. PierreRobin syndrome
Answer  Explanation 

ANSWER: PierreRobin syndrome

Explanation:
No explanation is available for this question!


4)   Facial edema, cheilitis granulomatosa and a fissured tongue characterize which of the following syndromes ?

a. Frey
b. Melkerson-Rosenthal
c. Teacher Collins
d. None of the above
Answer  Explanation 

ANSWER: Melkerson-Rosenthal

Explanation:
No explanation is available for this question!


5)   Globulamaxillary cyst is______________?

a. Soft tissue cyst present often between maxillary Lateral incisor and cuspid teeth
b. Often present between incisor and cuspid teeth but is a bone cyst
c. A cyst present between the midline of the palate
d. A cyst present in the incisive canal
Answer  Explanation 

ANSWER: Often present between incisor and cuspid teeth but is a bone cyst

Explanation:
No explanation is available for this question!


6)   Peg-shaped incisors which taper towards the incisal edge are typically seen in all of the following conditions EXCEPT______________?

a. Congenital syphilis
b. Rickets
c. Anhidrotic ectodermal dysplasia
d. Supernumerary teeth
Answer  Explanation 

ANSWER: Rickets

Explanation:
No explanation is available for this question!


7)   A union of the roots of adjacent teeth through the cementum is referred to as_____________?

a. Concrescence
b. Fusion
c. Gemination
d. None of the above
Answer  Explanation 

ANSWER: Concrescence

Explanation:
No explanation is available for this question!


8)   Animals maintained in germ free environmental did not develop caries even when fed on a high carbohydrate diet is given by_____________?

a. Gottlieb
b. Miller
c. Synder
d. Orland and Fizgerald
Answer  Explanation 

ANSWER: Orland and Fizgerald

Explanation:
No explanation is available for this question!


9)   Initiation of caries by streptococcus mutans is by the production of______________?

a. Dextranase and soluble dextran
b. Insoluble dextan and glucosyl transferase
c. soluble dextan and glucosyl transferase
d. None of the above
Answer  Explanation 

ANSWER: Insoluble dextan and glucosyl transferase

Explanation:
No explanation is available for this question!


10)   Ammonia causes______________?

a. Increase in plaque formation
b. Increase in calculus formation
c. Decrease in plaque formation
d. Causes precipitation of salivary proteins
Answer  Explanation 

ANSWER: Decrease in plaque formation

Explanation:
No explanation is available for this question!


11)   Pioneer bacteria in dental caries are in_____________?

a. Enamel
b. Dentin
c. Pulp
d. Cementum
Answer  Explanation 

ANSWER: Dentin

Explanation:
No explanation is available for this question!


12)   Chemico-parasitic theory of dental caries is proposed by______________?

a. Miller
b. G.V black
c. Gottlieb
d. Schwartz
Answer  Explanation 

ANSWER: Miller

Explanation:
No explanation is available for this question!


13)   In a caries-free individual the saliva has_____________?

a. low buffering capacity of acids
b. Medium buffering capacity for acids
c. High buffering capacity for acids
d. Independent of buffering capacity for acids
Answer  Explanation 

ANSWER: High buffering capacity for acids

Explanation:
No explanation is available for this question!


14)   The lateral spread of dental caries is facilitated mostly by the_______________?

a. Enamel spindles
b. Dentinoenamel junction
c. Enamel lamellae
d. Striae of Retzius
Answer  Explanation 

ANSWER: Dentinoenamel junction

Explanation:
No explanation is available for this question!


15)   Caries, all are true except______________?

a. Lactobacillus is main acusative organism in plaque
b. Smooth surface caries occur due to streptococcus mutans
c. Pit and Fissure caries can be prevented by using pit and tissue sealants
d. Fluorides help in reducing caries incidence
Answer  Explanation 

ANSWER: Lactobacillus is main acusative organism in plaque

Explanation:
No explanation is available for this question!


16)   Intitation of dental caries depends upon_______________?

a. Formation of large amount of acid
b. Availability of carbohydrate food
c. Viscosity of saliva
d. Localization of acid over tooth surface
Answer  Explanation 

ANSWER: Localization of acid over tooth surface

Explanation:
No explanation is available for this question!


17)   Miller put forth the acidogenic theory of dental caries in the year______________?

a. 1890
b. 1920
c. 1924
d. 1980
Answer  Explanation 

ANSWER: 1890

Explanation:
No explanation is available for this question!


18)   Turbid dentin in carious tooth is all EXCEPT_____________?

a. Zone of bacterial invasion
b. Zone which can not be remineralized
c. Zone in which collagen is irreversibly denatured
d. Zone that need not be removed before restoration
Answer  Explanation 

ANSWER: Zone that need not be removed before restoration

Explanation:
No explanation is available for this question!


19)   Least cariogenic among these______________?

a. Raw starch
b. Cooked starch
c. Sucrose
d. Fructose
Answer  Explanation 

ANSWER: Raw starch

Explanation:
No explanation is available for this question!


20)   In the earliest stages of carious lesion. There is loss of______________?

a. Enamel cuticle
b. Interprismatic substance
c. Organic matrix
d. Enamel lamellae
Answer  Explanation 

ANSWER: Interprismatic substance

Explanation:
No explanation is available for this question!


21)   What is the PH at which initiation of caries begin ?

a. 4.3-4.5
b. 5.2-5.5
c. 4.9-5.1
d. 3.5-4.5
Answer  Explanation 

ANSWER: 5.2-5.5

Explanation:
No explanation is available for this question!


22)   The dietary carbohydrate most likely involved in etiology of dental caries in man is____________?

a. Glucose
b. Sucrose
c. Dextran
d. Polysaccharide
Answer  Explanation 

ANSWER: Sucrose

Explanation:
No explanation is available for this question!


23)   The corrct order of microscopic zones of dentinal caries starting from the D.E junction is_______________?

a. Zone of sclerosis, decalcification zone, bacterial invasion
b. Bacterial invasion, decalcification zone, zone of sclerosis
c. Zone of sclerosis, backterial invasion, decalcification zone
d. Decalcification zone, zone of scierosis, backterial invasion
Answer  Explanation 

ANSWER: Bacterial invasion, decalcification zone, zone of sclerosis

Explanation:
No explanation is available for this question!


24)   Dental caries is associated with_____________?

a. Streptococcus agalactiae
b. Streptococcus mutans
c. Streptococcus bovis
d. Streptococcus anginosus
Answer  Explanation 

ANSWER: Streptococcus mutans

Explanation:
No explanation is available for this question!


25)   Which of the following is cariogenic ?

a. Selenium
b. Vanadium
c. Strontium
d. Molybdenum
Answer  Explanation 

ANSWER: Selenium

Explanation:
No explanation is available for this question!


26)   Starch is considered to be less cariogenic than monosaccharides and disaccharides because it_______________?

a. Does not diffuse through plaque
b. Is rapidly hydrolysed in the mouth
c. Enhances remineralisation
d. Raises the PH in the oral cavity
Answer  Explanation 

ANSWER: Does not diffuse through plaque

Explanation:
No explanation is available for this question!


27)   Organism involved in smooth surface caries is____________?
1 Streptococcus mutans
2 Actinomyces viscosus
3 Lactobacillus
4 Campylobacter


a. only 1
b. only 2
c. 1 and 3
d. All of the above
Answer  Explanation 

ANSWER: only 1

Explanation:
No explanation is available for this question!


28)   The attachment of the Actinomyces species to the tooth surface is facilitated by____________?

a. Fimbriae
b. Cilia
c. Flagella
d. Pseudopodia
Answer  Explanation 

ANSWER: Fimbriae

Explanation:
No explanation is available for this question!


29)   Which of the following factors in the stephan’s curve is related to the caries incidence and sugar intake______________?

a. Physical form of sugar
b. Frequency of sugar intake
c. Ph of Plaque
d. Quantity of sugar intake
Answer  Explanation 

ANSWER: Ph of Plaque

Explanation:
No explanation is available for this question!


30)   Cavity formation in a tooth, due to dental caries is due to______________?

a. Destructive potential of streptococcus mutans
b. Destructive potential of lactobacillus acidophilus
c. Lateral spread of caries along DE junction and weakening of the outer covering enamel
d. Mastectomy force and unrelated to the extent of carious process
Answer  Explanation 

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

Explanation:
No explanation is available for this question!


31)   The most pronounced effect on the oral microflora of a reduction in rate of salivary flow is a_____________?

a. Significant increase in number of oral bacteria
b. Shift towards more acidogenic microflora
c. Significant decrease in number of oral bacteria
d. Shift towards more aerobic microflora
Answer  Explanation 

ANSWER: Shift towards more acidogenic microflora

Explanation:
No explanation is available for this question!


32)   Which of the following organisms is found in deep carious lesions rather than in incipient lesions ?

a. Streptococci
b. Lactobacilli
c. Veillonella
d. Bateroides
Answer  Explanation 

ANSWER: Lactobacilli

Explanation:
No explanation is available for this question!


33)   Early invading bacteria in carious lesions are called___________?

a. Microcosm
b. Pioneer bacteria
c. Advancing bacteria
d. Anaerobic bacteria
Answer  Explanation 

ANSWER: Pioneer bacteria

Explanation:
No explanation is available for this question!


34)   The prbable reasons for a high incidence of dental caries in the teenage population relates most directly to______________?

a. Rapid growth
b. Frequency of sucrose intake
c. Negligence in visiting the dentist
d. Carelessness in oral hygiene habits
Answer  Explanation 

ANSWER: Frequency of sucrose intake

Explanation:
No explanation is available for this question!


35)   The enzyme glucosyl transferase secreted by Streptococcus mutans sythesizes glucans from_____________?

a. The enzyme glucosyl transferase secreted by Streptococcus mutans sythesizes glucans from_____________?
b. Fructose
c. Sucrose
d. Lactose
Answer  Explanation 

ANSWER: Sucrose

Explanation:
No explanation is available for this question!


36)   For a bacterium to be seriously considered in the etiology of dental caries, it must______________?

a. Exist regularly in the dental plaque
b. Produce extracellular amylopectins
c. Be lethal for gnotobiotic animals
d. Produce intracellular dextrans
Answer  Explanation 

ANSWER: Exist regularly in the dental plaque

Explanation:
No explanation is available for this question!


37)   Streptococcus mutans is considered to be principle etiologic agent of caries because it produces organic acids and it ________________?

a. Forms a gelatinous matrix
b. Metabolizes substrate from saliva
c. Derives energy from enamel constituents
d. Lives symbiolically with lactobacillus
Answer  Explanation 

ANSWER: Forms a gelatinous matrix

Explanation:
No explanation is available for this question!


38)   Which tooth in the permanent dentition is the most susceptible to dental caries ?

a. Maxillary 1st premolar
b. Maxillary 2nd molar
c. Mandibular 1st molar
d. Mandibular 2nd molar
Answer  Explanation 

ANSWER: Mandibular 1st molar

Explanation:
No explanation is available for this question!


39)   Smooth surface caries is characterized by spread of caries in enamel and dentin as cones. These alignment in enamel and dentin is____________?

a. Base to base
b. Apex to base
c. Apex to apex
d. None of the above
Answer  Explanation 

ANSWER: Apex to base

Explanation:
No explanation is available for this question!


40)   Oral foci of miller’s are seen in_______________?

a. Dental caries
b. Lichen planus
c. Herpes simplex
d. Syphilis
Answer  Explanation 

ANSWER: Dental caries

Explanation:
No explanation is available for this question!