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
Related Mcqs:
- Marked reduction in amount of dentin, widening of predentin layer, presence of large area of interglobular dentin and irregular pattern of dentin is seen in______________?
A. Hypocalcified dentin
B. Odonto dysplasia
C. Dentin dysplasia
D. Dentinogenesis imperfecta - 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 - Compared to the inter tubular dentin, peritubular dentin is characterized by which of the following ?
A. Greater stainability
B. Lasser content of inorganic salts
C. greater content of inorganic salts
D. Greater content of large collagen fibres - In adult teeth, the type of dentin present underlying dentin-enamel junction is_______________?
A. Predentin
B. Mantle dentin
C. Interglobular dentin
D. Tertiary dentin - A histologic evidence of widespread formation of globular hypocalcified dentin and pulp horns reaching the dentinoenamel junction, absence of lamina dura around the tooth in radiograph are the characteristic features of_____________?
A. Vitamin -D resistant rickets
B. Hypophosphatasia
C. Hypervitaminosis-A
D. Vitamin-A deficiency - Which one of the following restorative materials is having coefficient of thermal expansion close to that of tooth enamel and dentin ?
A. Microfilled composite resins
B. Pure gold
C. Silver amalgam
D. Type II Glass ionomer cement - In a patient with reduced salivary flow the carious incidence is_______________?
A. More than the patient with normal salivary flow
B. less than the patient with normal salivary flow
C. unaffected
D. None of the above - Which of the following organisms is found in deep carious lesions rather than in incipient lesions ?
A. Streptococci
B. Lactobacilli
C. Veillonella
D. Bateroides - Early invading bacteria in carious lesions are called___________?
A. Microcosm
B. Pioneer bacteria
C. Advancing bacteria
D. Anaerobic bacteria - In the earliest stages of carious lesion. There is loss of______________?
A. Enamel cuticle
B. Interprismatic substance
C. Organic matrix
D. Enamel lamellae
