Dentosphere : World of Dentistry

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...

# The upper denture falls when the patient opens his mouth wide. This is due to: A. Thick labial flange B. Over extended borders C. Thick Disto buccal flange D. Poor Peripheral Seal CLICK HERE FOR EXPLANATION # Distolingual extension of the mandibular impression for a complete denture is limited by the action of : A. Stylohyoid muscle B. Medial pterygoid muscle C. Lateral Pterygoid muscle D. Superior Constrictor Muscle # Posterior Palatal Seal (PPS) anatomically is : A. Pterygomaxillary notches and Fovea Palatine B. Pterygomaxillary notches and PNS C. Maxillary tuberosity and Pterygomandibular Raphe D. Posterior limit of palatine bone # Secondary peripheral seal area in mandible is provided by: A. Buccal Shelf B. Anterior lingual Border C. Retromolar pad D. Crest of the ridge # Increased depth in posterior palatal seal area in mandible is provided by : A. Tingling sensation B. Gagging C. Increased retention D. Unseating of dentur...

# The cyst which is found within the bone at the junction of the globular process, the lateral nasal process and maxillary process is : A. Naso-alveolar cyst B. Globulomaxillary cyst C. Nasopalatine cyst D. Mid palatine cyst # The histological appearance of " lava following around boulders in dentin dysplasia " suggests : A. Attempt to repair the defective dentin B. Abrupt arrest to dentin formation in crown C. Abnormal dentin formation in disorganised fashion D. Cascades of dentin to form root # A four year old child with one tooth less than the normal dentition shows a large tooth with two crowns and two root canals. The anomaly is : A. Dilaceration B. Fusion C. Concrescence D. Gemination # Which of the following is most common developmental cyst ? A. Nasopalatine cyst B. Naso- alveolar cyst C. Globulomaxillary cyst D. Median palatal cyst # A 6 year old patient with extra cusp on maxillary central incisor is associated with a...

# Epstein pearls are cysts that arise from ? A. Squamous tissue of the mucosa B. Connective tissue of the mucosa C. Rests of the Malassez D. Dental Lamina # A dens in dente is caused by : A. An abnormal proliferation of pulp tissue B. Denticle formation within the pulp tissue C. A deep invagination of the enamel organ during formation D. A supernumerary tooth bud enclaved within a normal tooth # In children the most frequently missing permanent teeth are : A. First premolars B. Second premolars C. Maxillary lateral incisors D. Mandibular lateral incisors # Hutchinson's incisors are present in: A. Congenital syphilis B. Tertiary syphilis C. Secondary syphilis D. Acquired syphilis # A 15 year old boy shows an inverted pear shaped radiolucency between the upper central incisors. The teeth are normal in all aspects. The most likely diagnosis is : A. Globulomaxillary cyst B. Nasopalatine cyst C. Aneurysmal cyst D. Dentigerous cyst...

# Bohn's nodules are : A. Cystic swellings in neonates B. Cysts associated with soft palate C. Cysts of gingiva in growing children D. Warts on the tongue # False about anodontia : A. May involve both the deciduous and the permanent dentition B. In false anodontia, tooth doesn't undergo full development C. may involve a single tooth D. In total anodontia , all teeth are missing # Turner's tooth is seen in : A. enamel hypoplasia due to hypocalcemia B. enamel hypoplasia due to birth injuries C. enamel hypoplasia due to congenital syphilis D. enamel hypoplasia due to local infection or local trauma # All are true about supernumerary tooth except : A. may have resemblance to normal teeth B. distomolars does not resemble any other tooth C. Mesiodens is the most common supernumerary tooth D. more common in mandible # Dental anomaly of teeth associated with defective bone formation is seen in : A. Amelogenesis imperfecta B. dent...

# A union of the roots of adjacent teeth through the cementum is referred to as : A. Concrescence B. Fusion C. Gemination D. None of the above # The term dilaceration refers to : A. A deformity of a tooth consisting of a sharp bend in the root B. Abrasions on two surfaces of a single tooth C. A root or tooth that is split into two D. A tooth that is fractured at two or more places

# The main function of the horizontal fibers of the PDL is: A. Prevent extrusion B. Prevent rotation C. Maintains the mesiodistal width D. All of the above # The periodontal ligament is approximately : A. 0.25 mm inn thickness B. 0.5 mm in thickness C. 0.75 mm in thickness D. 1.0 mm in thickness # Narrowing of periodontl ligament in labially placed mandibular canine with age is due to : A. Due to deposition of cementum and bone B. Down growths of gingival epithelium C. Gingival cysts formed from cell rests D. Reversal of function of horizontal and oblique fibers # Centre of the disc of TMJ is : A. Avascular B. Devoid of nervous tissue C. Avascular and devoid of nervous tissue D. None of the above # The type of bone present in the labial area of the anterior teeth is: A. Cortical B. Cancellous C. Osteophytic D. Exophytic # The component of future TMJ shows...