🏥Medical MCQs
Medical MCQs
499 MCQs21
Streptococcus mutans is considered to be principle etiologic agent of caries because it produces organic acids and it ________________?
AForms a gelatinous matrix
BMetabolizes substrate from saliva
CDerives energy from enamel constituents
DLives symbiolically with lactobacillus
22
Miller put forth the acidogenic theory of dental caries in the year______________?
A1890
B1920
C1924
D1980
23
Turbid dentin in carious tooth is all EXCEPT_____________?
AZone of bacterial invasion
BZone which can not be remineralized
CZone in which collagen is irreversibly denatured
DZone that need not be removed before restoration
24
Least cariogenic among these______________?
ARaw starch
BCooked starch
CSucrose
DFructose
25
In the earliest stages of carious lesion. There is loss of______________?
AEnamel cuticle
BInterprismatic substance
COrganic matrix
DEnamel lamellae
26
What is the PH at which initiation of caries begin ?
A4.3-4.5
B5.2-5.5
C4.9-5.1
D3.5-4.5
27
The dietary carbohydrate most likely involved in etiology of dental caries in man is____________?
AGlucose
BSucrose
CDextran
DPolysaccharide
28
The corrct order of microscopic zones of dentinal caries starting from the D.E junction is_______________?
AZone of sclerosis, decalcification zone, bacterial invasion
BBacterial invasion, decalcification zone, zone of sclerosis
CZone of sclerosis, backterial invasion, decalcification zone
DDecalcification zone, zone of scierosis, backterial invasion
29
Dental caries is associated with_____________?
AStreptococcus agalactiae
BStreptococcus mutans
CStreptococcus bovis
DStreptococcus anginosus
30
Which of the following is cariogenic ?
ASelenium
BVanadium
CStrontium
DMolybdenum