Dentosphere : World of Dentistry

 # The average length of maxillary cuspid is: A. 26 mm B. 33 mm C. 21 mm D. 18 mm The correct answer is: A. 26 mm. The average crown length of maxillary permanent canine is 10 mm and average root length is 17 mm. Hence, the average length of permanent maxillary canine is 27 mm. CLICK HERE FOR MORE MCQs

 # The best radiographic technique for demonstration of internal derangements of the TMJ is: A. MRI B. CT scan C. Arthrography D. Conventional radiographs The correct answer is A. MRI.  Magnetic resonance imaging (MRI) is a medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes of the body. MRI scanners use strong magnetic fields, magnetic field gradients, and radio waves to generate images of the organs in the body. MRI does not involve X-rays or the use of ionizing radiation, which distinguishes it from CT and PET scans. MRI is a medical application of nuclear magnetic resonance (NMR) which can also be used for imaging in other NMR applications, such as NMR spectroscopy. MRI is widely used in hospitals and clinics for medical diagnosis, staging and follow-up of disease. Compared to CT, MRI provides better contrast in images of soft-tissues, e.g. in the brain or abdomen. However, it may be perceived as less comfortable by p...

 # A patient of head injury should be carried in ________ position. A. Prone B. Supine C. Lateral D. Sitting The correct answer is C. Lateral. Patients with head injury should be carried in semiprone position and never on their back. This prevents the accumulation of blood and secretions and pulls the tongue forward in semi or unconscious patients. CLICK HERE FOR MORE MCQs

 # In modified radical neck dissection, the structure preserved is: A. Submandibular gland B. Spinal accessory nerve C. Sternocleidomastoid muscle D. Internal jugular vein The correct answer is A. Submandibular gland. Radical neck dissection (RND) Removal of all cervical lymphatics and lymph nodes from level IV, with sacrifice of the spinal accessory nerve, the sternocleidomastoid muscle and the internal jugular vein. Modified radical neck dissection (MRND) Involves the removal of cervical lymphatics and lymph nodes from levels IV along with one or more of the non lymphatic structures mentioned below: • The spinal accessory nerve (SAN) • The internal jugular vein (IJV) • The sternocleidomastoid muscle (SCM) CLICK HERE FOR MORE MCQs

# Synthesis of DNA occurs in which phase of cell cycle? A. Mitosis-M phase B. Gap- G1 phase C. Gap-G2 phase D. Synthesis- S phase # Correct sequence of cell cycle is: A. G0-G1-S-G2-M B. G0-G1-G2-S-M C. G0-M-G2-S-G1 D. G0-G1-S-M-G2

# Which of the following is a interstitial accumulation that leads to compression and degeneration of cell? A. Amyloid B. Protein accumulation such as Russel bodies seen in plasma cell C. Fat accumulation seen in fatty liver D. Hydropic and vascular changes due to water accumulation # All of the following characteristics of amyloid can be used to distinguish it from other hyaline degeneration EXCEPT: A. Intracellular accumulation B. Affinity for congo red stain C. It is formed due to accumulation of immunoglobulins D. Immunofluorescein isothiocyanate test or secondary to predisposing diseases

 # Lyonization type of Amelogenesis imperfecta is seen in: A. X linked dominant B. Autosomal dominant C. Autosomal recessive D. X linked recessive The correct answer is A. X linked dominant. Lyonization- The inactivation of an X chromosome. It is seen in X linked dominant diseases. It is named after geneticist Mary Lyon. The process of lyonization is the deactivation of the genes of one random X chromosome in women to avoid duplication of the genes.  CLICK HERE FOR MORE MCQs