MDS PREP
What is the effect of oxytocin on the myoepithelial cells of the mammary gland?
1) Contraction to facilitate milk ejection
2) Relaxation to facilitate milk secretion
3) Increase in cellular metabolism
4) Growth and proliferation of myoepithelial cells
E. Inhibition of milk secretion
Oxytocin causes contraction of the myoepithelial cells surrounding the mammary alveoli, which presses milk into the larger ducts and leads to the milk let-down reflex. This is essential for milk ejection during lactation.
The following projection best locates the position of impacted third molar
1. Lateral oblique view of mandible
2. Waters view
3. Occlusion view combined with periapical view
4. Occlusal view combined with bite wing
Radiology
Answer: 3
The projection that best locates the position of an impacted third molar is occlusion view combined with periapical view.
Amount of cusp reduction recommended to receive a metal-ceramic restoration is
1) 0.75 mm
2) 1 mm
3) 1.5 mm
4) 2.5 mm
Prosthodontics
Answer: 3
Gingivally the depth of a class V cavity is
1. 0.5-1 mm
2. 0.75-1 mm
3. 1-1.25 mm
4. 2-3 mm
Conservative Dentistry
Answer: 2
Gingivally, the depth of a class V cavity is typically 0.75-1 mm. This depth is
sufficient to provide a good bond with the tooth structure and prevent
microleakage without causing significant gingival irritation or damage.
Composites used as dental sealant are composed of
1) Glass ionomers
2) Methylmethacrylate
3) Bis-GMA
4) EBA resins
Conservative Dentistry
Answer: 3
Which cranial nerve is involved in the parasympathetic innervation of the lacrimal gland and pupillary constriction?
1) Cranial nerve III (Oculomotor)
2) Cranial nerve VII (Facial)
3) Cranial nerve X (Vagus)
4) Cranial nerve V (Trigeminal)
The vagus nerve, also known as the tenth cranial nerve, provides the parasympathetic innervation to various organs, including the lacrimal gland for tear production and pupillary constriction via the ciliary ganglia.