121. Formula of hydroxyapatite crystal is____________?
A. Ca3 (Po4)2 CaCo3
B. 3Ca (Po4)2 Ca(OH)2
C. CaPo4 Ca(OH)2
D. None of the above
✅ The correct answer is option B. 3Ca (Po4)2 Ca(OH)2.
Oral Histology
122. Which papillae are completely keratinized______________?
A. Fungiform
B. Filiform
C. Circumvallate
D. Foliate
✅ The correct answer is option B. Filiform.
123. Reversal lines which may be seen on the cribriform plate (alveolar bone proper) of the alveolar process indicate the cessation of____________?
A. Osteoblastic activity
B. Osteoclastic activity
C. Myeloid activity
D. Healing activity
✅ The correct answer is option B. Osteoclastic activity.
124. Merkel cells are found in which of the following tissue ______________?
A. Epidermis
B. Papillary layer of dermis
C. Reticular of dermis
D. Hypodermis
✅ The correct answer is option A. Epidermis.
125. Pain originate in the pulp due to_________?
A. free nerve ending in cell rich zone
B. free nerve ending at sub odontoblastic layer
C. Krause bulb at the center of the pulp
D. Meisseners corpuscles at cell rich zone
✅ The correct answer is option B. free nerve ending at sub odontoblastic layer.
126. One of the following statement is unique about circumpulpal dentine______________?
A. Collagen fibers are oriented perpendicular to DEJ
B. Vonkorff fibers are present
C. Contain phosphophoryn
D. Requires matrix vesicle for mineralization
✅ The correct answer is option C. Contain phosphophoryn.
127. Alveolar process helps in providing_____________?
A. Support and retention to the complete denture
B. Boundaries for the tongue during speech
C. Attachment to muscles of facial expression
D. Support the natural teeth
✅ The correct answer is option D. Support the natural teeth.
128. In a dried skull, holes on the lingual aspects of the deciduous teeth are called_____________?
A. Volkmann canals
B. Canals of Hirchfeld and Zuckerland
C. Herversian canals
D. Gubernacular canals
✅ The correct answer is option D. Gubernacular canals.
129. In mammals independent and tough suspension for teeth is provided by____________?
A. Alveolar sockets
B. Cementum
C. Gubernacular cords
D. Periodontal membrane
✅ The correct answer is option D. Periodontal membrane.
130. In cap stage, regulating factor for cusp shape formation is present in____________?
A. Dental papilla
B. Dental follicle
C. Inner enamel epithelium
D. Enamel Knot
✅ The correct answer is option D. Enamel Knot.