All the questions have been directly picked from Carranza 11th edition
1. Pre-requisite for plaque formation is
a. Pellicle
B.
Glycoprotein
c. Mucopolysaccharide
d. Dextran
Ans: a. Pellicle
Pellicle
formation starts with absorption of glycoprotein form saliva.
2.
The yellow white, soft sticky, deposit of cellular debris and bacteria loosely
adherent on tooth surface is
a. Pellicle
b. Materia alba
c. Plaque
d. Calculus
Ans:
b. Materia alba
Sequence
of formation is Pellicle-Materia alba-Plaque-Calculus with pellicle
formation being the first.
3.
Inorganic component of subgingival plaque is derived from
a. Saliva
b. Crevicular fluid
c. a and b
d. Fluids ingested
Ans:
b. crevicular fluid
For
supragingival plaque, it is from the saliva.
4.
Composition of plaque formed on all restorative material surfaces is similar
except that on
a. Composite
b. Amalgam
c. Silicate.
d None of the above
Ans:
c. Silicates
Composition
of plaque over silicates changes due to the fluoride releasing capacity of
silicates.
5.
Hemin iron from the breakdown of host hemoglobin may be important in metabolism
of which of the following
a. Porphyromonas
gingivalis
b. Prevotella intermedia
c.
Prevotella melanogenicus
d. Wollinella recta
Ans:
a. Porphyromonas gingivalis
6.
According to Glickman, Maximum accumulation of plaque takes place in
a. 7 days
b.15 days
c. 30 days
d.60days
Ans:
c 30days
-Maximum
accumulation of plaque takes place approximately in 21 days. |
-Acquired
pellicle formation takes place within seconds. |
-Initial plaque
formation within 2 hours |
-Irreversible
colonisation of bacteria after 2 hours |
-supragingival
plaque well established within 6 hours |
7. After cleansing and pumicing the tooth
surface, plaque formation takes place within
a. A few minutes
b. 1/2 -1 hour
c.2-4-hour
d. After 1 hour
Ans:
b ½ to 1 hour
The
pellicle formation takes place within nanoseconds.
8.‘’Corncob
appearance’’ is seen in
a. supragingival calculus
b. subgingival calculus
c Supragingival plaque
d. Subgingival plaque
Ans;
c Supragingival plaque
It
is seen in supragingival plaque towards tooth surface.
9. Bacterial communication with each other in a
biofilm is through a phenomenon known as
a. Coaggregation phenomenon
b. Coadhesion phenomenon
c. Corncob phenomenon
d. Quorum sensing
Ans:
d Quorum sensing
Bacterial
communication takes place with
the help
1.
Peptides released by gram positive organisms during growth
2.
Universal signal molecule known as AI-2(Autoinducer-2)
10.
Bacterial enzyme capable of causing the breakdown of ground substance of the
periodontal ligament
a.
Lysozyme b.
Peroxidase
c.
Hyaluronidase d. streptokinase
Ans:
c hyaluronidase
11.
Specific plaque hypothesis was put forward by
a.
Jenco b.
Listgarten
c.
Loesche
d. Marsh
Ans:
c. Loesche
12.
‘’Coaggregation’’ is mainly predominated by
a.
Interaction between gram positive bacteria
b.
Interaction between gram negative bacteria
c.
Interaction between gram positive and gram-negative bacteria
d.
None
Ans:
b. Interaction between gram negative bacteria
Recognition
of genetically distinct partner cell types due to interaction of
carbohydrate and protein molecule located on the bacterial cell surface
and mediated by lectin like adhesins.
13.
Co-adhesion is a process of
a.
Attachment of primary colonizers on the tooth surface
b.
Attachment of new bacteria on the bacterial receptors
c.
formation of taste tube brush like appearance
d.
Irreversible colonization of bacteria on tooth
Ans:
b Attachment of new bacteria on bacterial receptors
14.
Following removal, plaque formation is rapid on
a.
Interproximal surface
b. Occlusal surface
c.
Lingual surface
d. Same on all surface
Ans:
a Interproximal surface
15.Which
of the tooth has most of the plaque?
a.
Gingival third
b.
Incisal third
c.
Middle third
d.
Uniform on all surfaces
Ans:
a Gingival third
Plaque
accumulates mostly on gingival third of tooth surfaces due to lack of movement
of food during mastication.
16.
Who modified the Koch’s postulates as related to periodontal disease?
a.
Socransky
b.
Glickman
c.
Russel
d.
Greene and Vermillion
Ans:
a. Socransky
17.‘Corncob
appearance’ of plaque is seen on
a.1week old plaque
b.2weeks old plaque
c.3weeks old plaque
d.4weeks old plaque
Ans:
c 3 weeks old plaque
18.Predominat
bacteria found in two-days old plaque
a. Steptococci
b. Bacteroids
c. Spirochetes
d. Actinomyces
Ans: a
19.Corncob appearance of bacteria in plaque
is seen towards
a. Tooth surface
b. Outer surface
c. Middle of plaque
d. All of the above
Ans: A
20.Supragingival plaque causes
a. Gingivitis
b. Periodontitis
c. Pericoronitis
d. Apthous ulcers
Ans-A
Subgingival plaque towards the tissue causes
periodontits
Subgingival plaque towards the tooth causes
root caries.
21. Radius of action of toxins in bacterial
plaque is
a. Less than 2.5mm
b. Greater than 3.5mm
c Less than 1.5mm
d.1.5-2.5mm
Ans. d 1.5-2.5mm
Radius of action is the range of effectiveness
of the bacterial toxins.
22.
P.intermedium are present in --------
complexes.
a.
Orange
b.
Red
c.
Green
d.
Purple and
yellow
Ans –a
Aggregetibacter (serotype a) falls under green complex
23. All of the following are protective
agents in periodontal disease except
a. S. sanguis
b. C. ochracea
c. V. parvula
d. B. oralis
Ans-d
24. Which of the following organisms is not
implicated in aetiology of periodontal disease
a. Bacteroides
b. Wolinella
c. Neisseria
d.
Eikenella
Ans-c
Neiseria is not a periodontal pathogen
25. Which of the following is a periodontal
pathogen
a.
S.
sanguis
b.
S.
mutans
c.
A.
viscosus
d. P. gingivalis
Ans-d
26. Bacteria which are not found in normal
healthy periodontium are
a. Actinomyces
b. Capnocytophaga
c. Veillonella
d. Eubacterium
Ans-d
27. Actinobacillus
actinomycetemecomitans is
a. Gram positive aerobe
b. Gram negative aerobe
c. Obligate anaerobe
d. Facultative anaerobe
Ans-d
28. Which micriorganisms has 90% presence
in localized aggressive periodontitis?
a.
Spirochaetes
b.
P.gingivalis
c.
P.intermedia
d.
A. actinomycetamcomitans
Ans-d
29.Localized Aggressive Periodontitis is
Present-
a. Equally in both the sexes
b. More in males
c. More in females
d. More in postmenopausal females
Ans-c
30.Breakdown of
periodontal fibres in periodontits is due to bacterial enzyme
a. Collagenase
b. Hyaluronidase
c. Coagulase
d. Streptokinase
Ans-a
31.Which organism is increased in pregnant
ladies
a.
Prevotella intermedia
b.
Porphyomonous gingivalis
c.
Porphyroonas gingivalis
d.
Eichenella corrodens
Ans-a
32.Leukotoxin is released is released by
a.
P.nucleatum
b.
A.naeslundi
c.
B.forsythna
d.
A.actinomyctemcomitans
Ans-d
33.BANA test measures activity of
a. Calculus
b. Cathepsin
c. Elastase
d. Trypsin like enzyme
Ans-D
34.All of the following organisms can be
detected by BANA analysis EXCEPT?
a.
Tanerella forsythia
b.
Porphyomonas gingivalis
c.
Capnocytophaga
d.
Actinomycetemcomitans
Ans-d
35.The carbohydrate not associated with
dental plaque is
a. Dextrose
b. Levans
c. Glucose
d. Rhamnose
Ans-d
36.Which of the most numerous component
of plaque?
a. Minerals
b. Food debris
c. Microorganisms
d. Leukocytes
Ans-c
37.Which o the following is the most
likely source of collagenase?
a. Staphylococus aureus
b. Bacteroides gingivalis
c. Treponema microdentum
d. Veillonella alkalescens
Ans-b
38.Dental plaque is formed by reaction
of enzymes on:
a. Sucrose and lipids
b. Glucose and proteins
c. Glucose and lipids
d. Sucrose and saliva
Ans-d
39.Subgingival scaling alters the
microflora of periodontal pocket
a. Never gets altered
b. Aerobes only
c. Gets altered
d. Anaerobes only
Ans-c
40.Lactic acid is produced in mouth by
a) Saccharolytic
bacteria in supragingival region
b) Saccharolytic bacteria in subgingival region
c) Non-saccharolytic bacteria in supragingival
region
d) Non-saccharolytic bacteria in subgingival
region
Ans-a
41.Which of the following bacteria do not invade host tissue cell?
a)
T. denticola
b)
P. intermedia
c)
P. gingivalis
d)
F. nucleatum
Ansj-b
42. Which of the following species is
found in abundance in adult plaque?
a) Fusobacterium
b) Cocci
c) Bacteroids
d) All of the above
Ans-a
43. Periodontitis is caused by
a) Malnutrition
b) Supra gingival plaque
c) Bio-film
d) Faulty tooth brushing
Ans-c
44. The organism least likely to be found
in normal gingival crevices is
a) Fusobacterium sp.
b) Actinomyces sp.
c) Diptheroids
d) Streptococci sps.
Ans-c
45. Dental plaque adheres to the tooth because:
a) Levans are gummy
b) Detrans are insoluble and sticky
c) Plaque grows into the microorganisms
d) Microorganisms produce sticky lipoproteins
Ans-b
46. Co-aggregation is mainly
predominated by
a) Interaction between Gm +ve bacteria
b) Interaction between Gm -ve bacteria
c) Interaction between Gm +ve and Gm –ve bacteria
d) None of the above
Ans-b
47. Which of the following species of
streptococci is usually not found in human dental plaque
a)
S. mutans
b)
S. sanguis
c)
S. pyogens
d)
S. salivarius
Ans-c
48.
The biofilms found on tooth surfaces are termed as
a) Enamel
b) Dental caries
c) Dental plaque
d) Saliva
Ans-c
49.
Commonly isolated organism from oral cavity is
a) Streptococcus sanguis
b) Streptococcus pyogens
c) Neisseria gonorrhea
d) Streptpcpccus pneumonia
Ans-a
50.What is/are the method/methods of
transferring information in a biofilm?
a) Quorum Sensing
b) Conjugation
c) Plasma transfer
d) All of the above
Ans-d
51.
‘’Red complex’’ contains organisms that
a.
Cause periodontal disease
b.
Associated with bleeding on probing
c.
Contain early colonisers
d.
Contain late colonisers
Ans:
b Associated with bleeding on probing
53.
“Port d’ entrĂ©e” for periodontopathogens
a) Gingiva
b) Teeth
c) Tongue
d) Periodontal ligament
Ans:
B
54. After full-mouth extraction,
the relative numbers of A. actinomycetemcomitans and P. gingivalis,
a) Remain unchanged
b) Is entirely eradicated
c) Decreased
d) Increased
Ans:
C
·
In contrary, the level of S. mutans reach below detectable
level after full mouth extraction as they are an obligate periphyte and require
hard tissue to colonize.
·
Mucosa cannot act as reservoir for these obligate periphyte.
No comments:
Post a Comment