241. Bone adjacent to periodontal ligament that contains a great number of sharpey’s fibres is known as______________?
A. Lamina dura
B. Bundle bone
C. Lamina propria
D. Lamina densa
✅ The correct answer is option B. Bundle bone.
Oral Histology
242. Moth eaten appearance of of enamel is seen in____________?
A. Odontodysplasia
B. Amelogenisis stage
C. Desmolytic stage
D. Mottled enamel
✅ The correct answer is option A. Odontodysplasia.
243. Sublingual gland is a_____________?
A. Mixed gland
B. Serous gland
C. Mucous gland
D. Present in root of tongue
✅ The correct answer is option A. Mixed gland.
244. The duct(s) of gland(s) opening into the floor of the mouth is (are)_______________?
A. Submandibular and sublingual
B. submandibular and parotid
C. Sublingual and parotid
D. Von Ebner
✅ The correct answer is option A. Submandibular and sublingual.
245. S shape of dentinal tubules is due to______________?
A. Incremental deposition
B. Peritubular dentin
C. Crowding of odontoblasts
D. Due to excess amount of organic component
✅ The correct answer is option C. Crowding of odontoblasts.
246. Width of PDL is_______________?
A. 0.10 mm
B. 0.50 mm
C. 0.25 mm
D. 0.75 mm
✅ The correct answer is option C. 0.25 mm.
247. Maxillary sinus is described as a four sided pyramid containing base, apex, roof and floor. The apex of maxillary sinus extends________________?
A. Laterally into zygomatics process of maxilla
B. Medially into zygomatic process of maxilla
C. Laterally into lateral nasal wall
D. Superiorly into floor of orbit
✅ The correct answer is option A. Laterally into zygomatics process of maxilla.
248. Morphological stages of tooth development are explained based on_____________?
A. Shape of enamel organ
B. Shape of tooth germ
C. Function of enamel organ
D. Shape of dental papilla
✅ The correct answer is option B. Shape of tooth germ.
249. The main function of horizontal fibres of P.D ligament is____________?
A. Prevent extrusion
B. Prevent rotation
C. Maintains the mesiodistal width
D. All of the above
✅ The correct answer is option C. Maintains the mesiodistal width.
250. perikymata are the external surface manifestations of_____________?
A. Enamel rods
B. Incremental lines of retzius
C. Nasmyth’s membrane
D. Pellicle
✅ The correct answer is option B. Incremental lines of retzius.