Dentosphere : World of Dentistry

On the occasion of World No Tobacco Day, Poster competition was jointly organized by the Department of Oral Medicine and Radiology and the Department of Public Health Dentistry, College of Dental Surgery, BPKIHS (B.P. Koirala Institute of Health Sciences), Dharan Nepal. Many posters rife with creative concepts and awareness messages were displayed in the college premises throughout the day. Patients and hospital visitors were counseled to quit tobacco in both smoked and smokeless forms after educating them about the horde of health hazards caused by tobacco.

Tobacco: A Threat to Development Tobacco, consumed worldwide in various smoked and smokeless forms, is now proved scientifically by various researches and investigations to be a definite carcinogen and an abetting factor for hundreds of health hazards. With aggressive marketing strategies and alluring advertisements tobacco producers aim at producing more and more tobacco dependent teenagers who succumb to the habit throughout their lives. And we play a conducive role in fulfilling their goal by exposing the children to tobacco every day to such an extent that they will somehow believe that all grown-ups do smoke/consume tobacco and so should he when he becomes one. This social impact of smoking is more deleterious than we believe it to be. Raising children in such a tobacco-ridden environment without them actually picking up the habit is very challenging to parents and to-be-parents. Tobacco consumption is socially accepted to be benign as it does not cause immediate harsh...

# Pancreatic juice rich in water and electrolytes but poor in enzymes is secreted in response to : A. Pancreatozymine B. Cholecystokinin C. Secretin D. Proteins # Secretin is secreted by : A. Duodenum B. Pancreas C. Liver D. Stomach # Urine urobilinogen is absent in : A. Obstructive jaundice B. Viral hepatitis C. Hemolytic jaundice D. All of the above # Which of the following is a reflex mediated by vagus ? A. Bile flow from liver B. Pancreatic secretion of bicarbonate C. Cephalic phase of gastric secretion D. Mucous secretion from the Brunner's glands # Fats absorbed with the help of bile salts are: A. Free fatty acids B. Glycerol C. Higher fatty acids, diglycerides and monoglycerides D. All of the above # Which of the following secretions has a very high pH ? A. Gastric juice B. Pancreatic juice C. Bile in gall bladder D. Saliva # Cephalic phase of gastric secretion can be demonstrated by the following exper...

# Parietal cells of gastric mucosa secrete : A. HCl B. Gastrin C. Mucin D. All of the above # Most potent stimulus for secretin is : A. Dilatation of intestine B. Acid chyme C. Protein D. Fat # The only sugar absorbed in the intestine against a concentration gradient is : A. Xylose B. Mannose C. Glucose D. Galactose # Cephalic phase of Gastric secretion is mediated by : A. Neurohormones B. Vagus C. Hormones D. Gastrin # Secretin does not cause : A. Bicarbonate secretion B. Augment the action of CCK C. Contraction of pyloric sphincter D. Gastric secretion increase # The final sugars in intestinal chyme are : A. Glucose and fructose B. Ribose and mannose C. Ribose and xylulose D. Xylulose and fructose # Gastric secretion is stimulated by all of the following except : A. Secretin B. Gastric distension C. Gastrin D. Vagal stimulus # Peristalsis in the gut is due to : A. Pre-peristaltic intestinal secretio...

# Pepsinogen is activated by : A. Enterokinase B. low pH C. Trypsin D. Chymotrypsin # Best stimuli for secretin secretion is : A. Protein B. Acid C. Fat D. Bile # Maximum secretory glands in stomach are : A. Fundic glands B. Pyloric glands C. Gastric glands D. Brunner's Glands # All are actions of CCK except: A. Relax lower esophageal sphincter B. Increased pancreatic secretion C. Increased gastric secretion D. Causes gall bladder contraction # Vagal stimulation following intake of food does not affect secretion of : A. Stomach B. Pancreas C. Parotid D. Gall bladder # Gastrin is produced by : A. Pancreas B. Gastric antral cells C. Pituitary D. All # Small intestinal peristalsis is controlled by : A. Myenteric plexus B. Meissner's plexus C. Vagus nerve D. Parasympathetic # The duodenum secretes a hormone which has the following effects except : A. Causes copious pancreatic juice rich in bicarbo...

# All are true regarding the enamel spindles except : A. Produced by ameloblasts B. Found in the region of cusps C. Surrounded by inter prismatic enamel D. Terminated as rounded process # Ionic exchange between enamel surface and environment : A. Does not take place once enamel matures B. Stops after 2 years of eruption C. Continues till adult life D. Continues throughout life # Approximately how many enamel rods will be present in maxillary molar? A. 5 million B. 7 million C. 9 million D. 12 million # All are true about the striae of Retzius except: A. Constitute the rest lines within the enamel rods B. Have high inorganic content C. They are areas of increased porosity D. Allow the movement of water and small ions # Neonatal lines are found in all of the following except : A. Enamel of primary incisors B. Enamel of premanent canines C. Enamel and dentin of permane...

# Ghost (Shadow) cells are seen in: A. Ameloblastic fibroodontoma B. Calcifying odontogenic cyst C. Compound Odontoma D. All of the above # A 25 year old male patient reports with a bony expansile swelling of the right body of the mandible & mild paraesthesia of the IDN. OPG shows a multilocular  radiolucency without root resorption. i) What would be your choice of next investigation? A. Excision biopsy B. Aspiration cytology C. CT scan D. PET bone scan ii) A dirty white aspirate with a protein estimation of <4gm% is suggestive of: A. Ossifying fibroma B. Dentigerous cyst C. Mucoepidermoid carcinoma D. Odontogenic keratocyst iii) Odontogenic keratocyst is noted for its: A. Malignant transformation B. Daughter cysts and high rate of recurrence C. Impacted teeth D. Nodal metastasis iv) Management of odontogenic keratocyst involves : A. Marsupialization B. Enucleation C. Enucleation with peripheral ostectomy D. Resection an...

  Click HERE to view all our MCQ Topics. # All of the following lesions may be classified as odontogenic tumors except : A. Acanthomatous ameloblastoma B. Branchial cleft cyst C. Myxoma D. Simple ameloblastoma # Bifid ribs, Multiple radiolucent lesions of the jaws, multiple basal cell nevi and falx cerebri calcification are found in : A. Basal cell nevus syndrome B. Sturge weber syndrome C. Horner syndrome D. Hereditary internal polyposis # Ameloblastoma most frequently occurs in: A. Mandibular molar region B. Maxillary molar region C. Mandibular premolar region D. Maxillary premolar region # Compound odontoma shows on a radiograph as: A. Supernumerary teeth B. Radiolucent and radioopaque areas C. Masses of calcified areas D. Distinguishable tooth like structures # Which of the following is true neoplasm of functional cementoblasts ? A. Periapical cemental dysplasia B. Familial cemental dysplasia C. Benign cementoblastoma ...

Dentigerous Cyst defined as an odontogenic cyst that surrounds the crown of an impacted tooth; caused by fluid accumulation between the reduced enamel epithelium and the enamel surface, resulting in a cyst in which the crown is located within the lumen. most common ; about 20% of all jaw cysts ; about 10% of impacted tooth form a dentigerous cyst almost always permanent tooth involved; rarely deciduous tooth involved Clinical Features: always associated initially with the crown of an impacted, embedded or unerupted tooth most common sites of this cyst are the mandibular and maxillary third molar and maxillary cuspid areas, as these teeth are most commonly impacted mostly solitary; bilateral and multiple cysts are usually found in association with a number of syndromes including cleidocranial dysplasia and Maroteaux–Lamy syndrome. potentially agressive; due to continuous enlargement of the cyst, may result in expansion of bone with subsequent facial asymmetry, e...

# Absolute period when whole heart is in diastole is : A. 0.7 sec B. 0.3 sec C. 0.2 sec D. 0.4 sec # The effects of adrenaline on heart are all except : A. Increases heart rate B. Decreases myocardial irritability C. Increases force of contraction D. Increases oxygen uptake by heart # Cardiac output is maximum to : A. Liver B. Brain C. Kidney D. Heart # Increase in carotid sinus pressure produces: A. Reflex hyperpnea B. Reflex bradycardia C. Reflex tachycardia D. Reflex hypercapnia # Effect on force of contraction of heart is : A. Chronotropic effect B. Dromotropic efffect C. Bathmotropic effect D. Inotropic effect # SA node acts as a pacemaker of the heart because of the fact that it: A. is capable of generating impulses B. has rich sympathetic innervations C. has poor cholinergic innervations D. generates impulses at the highest rate # Distribution of blood flow is mainly regulated by the : A. Arteries B. Arter...

# The first heart sound is produced by the : A. Closure of the aortic and pulmonary valves B. Opening of the aortic and pulmonary valves C. Closure of the mitral and tricuspid valves D. Opening of the mitral and tricuspid valves # Parasympathetic stimulation of heart causes: A. SA node decreases firing B. Increased AV node excitability C. Decreased ventricular contraction D. Tachycardia # Normally, the rate of the heart beat in a human is determined by: A. Bundle of His B. all cardiac muscles C. the SA node D. the cervical ganglion # The ventricular repolarisation in ECG is best seen in: A. "P" wave B. "Q" wave C. "R" wave D. "T" wave # Stroke output of each ventricle in normal adult is : A. 30 ml B. 130 ml C. 70 ml D. 5 liters # Cardiac output is a measure of : A. Peripheral resistance * tissue fluid B. Peripheral resistance * cardiac rate C. Blood pressure * Cardiac rate D. Hea...