Dentosphere : World of Dentistry

21st MAR 2014 B.P. Koirala Institute of Health Sciences, Dharan, Nepal 1st year BDS Internal Assessment Examination, March 2014 Paper - II A (GENETICS, GROWTH AND DEVELOPMENT, IMMUNOLOGY & BLOOD) Time - 2 Hours  Total Marks: 125 SHORT ANSWER QUESTIONS SECTION - 'A' ANATOMY   1. Classify chromosomal disorders with examples of each.                        5 2. Draw a labeled histological diagram of lymph node.                              5 3. Write the criteria and examples of X-linked recessive disorder.             5                                                                     SECTION - 'B' PHYSIO...

# Endotoxin is released from: A. Candida albicans B. Streptococcus sanguis C. Gram negative bacteria D. Actinomyces viscosus # All of the following oral conditions can give rise to bacteremias, EXCEPT: A. Extraction of tooth B. Periodontitis C. Endodontic therapy D. Dentinal caries # The most common extraoral cause of halitosis is: A. Indigestion B. Alcohol intake C. Chronic sinusitis D. Diabetes mellitus # The typical triad of maxillary sinusitis are: A. Nasal congestion, pathological secretion, Headache B. Nasal congestion, trismus, epiphora C. Nasal congestion, maxillary tooth pain, bloody discharge from the sinus D. Nasal obstruction, headache, ear ache

# Leutic glossitis is  an intraoral manifestation caused by: A. Mycobacterium tuberculosis B. Actinomycosis C. Treponema pallidium D. Streptococcus The correct answer is C. Treponema pallidium.  Leutic glossitis or syphilitic glossitis is atrophic or interstitial glossitis due to tongue involvement by treponema. The importance of leutic glossitis is the chance of undergoing malignant transformation.

# One advantage of digital radiography is: A. All the teeth can be in a single film B.  Highly economical C. The radiographic images are obtained immediately D. Pulpal vitality can be accurately assessed The correct answer is: C. The radiographic images are obtained immediately. Advantages of digital radiography are: - direct display of the image which is dynamic rather than static - less patient exposure due to greater sensitivity - Elimination of the need of darkroom

# Which of the following is useful for studying the movements of the tongue? A. Angiography B. Arthroscope C. Fluoroscope D. Sonography The correct answer is C. Fluoroscope. FLUOROSCOPY IS REAL-TIME RADIOGRAPHY . It allows continuous viewing of a time-varying X-ray image and  permits live visual examination of dynamic events. - Modern fluoroscopy systems use an X-ray image intensifier,  which converts the X-ray energy into visible light and is cou pled optically to a television camera. - The fluoroscopic image is viewed on a cathode-ray tube video  monitor, located either in the fluoroscopy room beside the  patient, or else in a remote location.

# Most cases of pulpitis are caused by: A. Injudicious cavity preparation B. Excessive heat incident to dry polishing of restorations C. Bacterial invasion from a carious lesion D. Bacterial invasion from the blood stream # Odontalgia that is occasionally typical in hypertensive patients is a result of: A. Headache radiating to the teeth B. Nervous tension and worry C. Hyperemia of pulp resulting from increased blood pressure D. Abnormal situation of the sympathetic nerve system

# A microorganism is described as smallest living organism, filterable submicroscopic and obligatory parasite. We are talking about: A. Virus B. Bacteria C. Fungi D. Protozoans # Which of the following is characteristic only of viruses? A. They are intracellular organisms B. They affect the production of interferon and are sensitive to it C. They reproduce by binary fission D. They can be grown on an inanimate media # Viruses can be isolated from clinical samples by cultivation in the following EXCEPT: A. Tissue culture B. Embryonated eggs C. Animals D. Chemically defined media # All of the following are true for identification of viruses EXCEPT: A. Nature of viral nucleic acid B. Ability to be grown on differential media C. Neutralisation with specific antisera makes antiviral vaccines a possibility D. Nature of protein coat