Ionic exchange between enamel surface and environment ______ ?
A. Continues till adult life
B. Continues through out life
C. Does not take place once enamel surface and invironment
D. Stops after 2 years of eruption
ORAL HISTOLOGY
Medical multiple-choice questions here cover topics like Oral Histology MCQs, with answers and explanations for medical students.
All are true about the striae of retzius except _____ ?
A. Have high inorganic content
B. They are areas of increased porosity
C. Constitute the rest lines with in the enamel rods
D. Allow the movement of water and small ions
On microscopic examination enamel rods have _____ ?
A. Paddle appearance in cross section
B. Lanullate appearance in cross-section
C. Key hole appearance in cross section
D. None of them
Formative cells of which of the following dental tissues disappear once tissue is formed _____ ?
A. Cementum
B. Enamel
C. Dentin
D. Periodontal ligament
Calcification in enamel starts at _____?
A. Root
B. CEJ
C. DEJ
D. Enamel matrix
Enamel spindles are formed by _____ ?
A. Ameloblasts
B. Hypocalcified rods
C. Cracks
D. Odontoblasts
Enamel rods at the cervical area at the occlusal edge and incisal lip in permanent teeth are ______ ?
A. Bent
B. Curved
C. Straight
D. Shallow
Thickness of prismless enamel in diciduous teeth is ____?
A. 75 μ m
B. 100 μ m
C. 25 μ m
D. 50 μ m
narled enamel is seen in _____ ?
A. Cusp tips of tooth
B. Proximal surface of tooth
C. Cervical region of tooth
D. None of them
Neonatal lines are seen in ____ ?
A. Enamel of premolars
B. Dentin of all teeth, as if is formed first
C. Enamel of deciduous incisiors
D. Enamel of permanent incisors