Dentosphere : World of Dentistry

# 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...

Histological Classification of Cancer and Precancer of the Oral Mucosa 1. Carcinomas Squamous cell carcinoma Verrucous cell carcinoma Basaloid squamous cell carcinoma Adenoid squamous cell carcinoma Spindle cell carcinoma Adenosquamous carcinoma Undifferentiated carcinoma 2. Benign lesions capable of microscopically resembling oral squamous cell carcinoma and oral verrucous carcinoma Papillary hyperplasia Granular cell tumor Discoid lupus erythematosus Median rhomboid glossitis Keratoacanthoma Necrotizing sialometaplasia Juxtaoral organ of Chievitz Chronic hyperplastic candidiasis Verruciform xanthoma Verruca vulgaris Condyloma acuminatum 3. Precancerous lesions (Clinical classification) Leukoplakia Erythroplakia Palatal keratosis associated with reverse smoking 4. Precancerous lesions (Histological classification) Squamous epithelial dysplasia Squamous cell carcinoma in situ Solar keratosis 5. Benign lesions capable of r...