Dentosphere : World of Dentistry

# 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...

# Periodontal fibers joining cemental surface of one tooth, to cemental surface of adjacent tooth are called: A. Gingivodental B. Cemental fibers C. Horizontal fibers D. Transseptal fibers # Sharpey's fibers are present in: A. Bone B. Periosteum C. Periodontal ligament D. All of the above # Interdependency of osteoblasts and osteoclasts in bone remodelling is called as: A. Lacunae B. Coupling C. Reversal lines D. Canaliculi # True about osteoclasts: A. Monocytes are precursor cells of osteoclasts B. The plasma membrane of osteoclasts adjacent to bone that is being resorbed is known as striated or ruffled border C. Contain lysosomes with acid phosphates D. All of the above are true # Periodontal ligament is made up of : A. Type I collagen B. Type I and Type III collagen C. Type I and Type II collagen D. Type I and Type IV collagen # Which of th...

# Width of PDL is : A. O.10 mm B. 0.50 mm C. 0.25 mm D. 0.75 mm # Intermediate Plexus is seen in the: A. Cementum B. PDL C. Pulp D. Dentin # In mammals independent and tough suspension for teeth is provided by: A. Alveolar sockets B. Cementum C. Gubernacular cords D. Periodontal membrane # Bone adjacent to periodontal ligament that contains a great number of Sharpey's fibers is known as : A. Lamina dura B. Bundle bone C. Lamina propria D. Lamina densa # The most abundant principal fiber group in periodontal ligament is : A. Horizontal B. Transseptal C. Apical D. Oblique # Collagen biosynthesis occurs inside the : A. Chondroblasts B. Odontoblasts C. Osteoblasts D. Fibroblasts # Which of the following groups of fibers are not attached to alveolar bone ? A. Apical B. Horizontal C. Oblique D. Transseptal ...

# Which of the following cells are the predominant connective tissue cells of the periodontal ligament? A. Cementoblasts B. Fibroblasts C. Osteoblasts D. Cell rests of Malassez # The periodontal ligament: A. Derives its blood primarily from the branches of vessels entering the pulp B. Has a slow rate of turn over C. Contains epithelial cells D. Comprises primarily of type II collagen # Which of the following is not the principal fiber group of the periodontal ligament ? A. Horizontal B. Oblique C. Alveolar crest D. Trans septal # Anchoring fibrils are composed of: A. Type V and VII collagen B. Type I and III collagen C. Type IV collagen D. Type IV and III collagen # Collagen molecule exhibits all of the following features EXCEPT : A. Triple plated sheath B. Mostly contains glycine residues C. Exhibit cross striations at 64 micrometer D. Intracellular...

# Spindle cell carcinoma is a variant of : A. Pleomorphic adenoma B. Adenoid cystic carcinoma C. Basal cell carcinoma D. Squamous cell carcinoma # Commonest site for ectopic salivary gland tumor is : A. Tongue B. Cheek C. Palate D. Neck # Chemical Mumps is synonymous with: A. Epidemic parotitis B. Iodine mumps C. Nutritional mumps D. Nonspecific mumps # Break up time (BUT) test is done in : A. Sjogren's syndrome B. Multiple sclerosis C. SLE D. Myasthenia gravis # Salivary duct calculi : A. Produce pain on eating B. Are commonest in the parotid ducts C. Are common cause of acute parotitis D. Are associated with hypercalcemic states # Sialoliths are stones found in the salivary duct and gland and are primarily composed of: A. Hydroxyapatite B. Potassium chloride C. Unknown compounds of phosphates D. Calcium chloride # In Xerostomia, the salivary pH is: A. Unaffected B. Low C. High D. Increased in morning a...

# The most common complication of mumps is : A. Myocarditis B. Orchitis C. Uveitis D. Conjunctivitis # Adenoid cystic carcinoma is also known as : A. Cylindroma B. Pindborg tumor C. Warthin's tumor D. Pleomorphic adenoma # Sialolith in the excretory duct will result in: A. Chronic sialadenitis B. Mucous retention cyst C. Pleomorphic adenoma D. Rupture of the cyst # Parotid fatty change is a sign of : A. Aging B. Alcoholism C. Malnutrition D. None of the above # Which tumor does not occur in minor salivary gland ? A. Pleomorphic adenoma B. Adenocarcinoma C. Mucoepidermoid carcinoma D. Warthin's tumor # Leafless fruit laden tree or cherry-blossom appearance on a sialogram indicates : A. Mucoepidermoid cell carcinoma B. Acinar cell carcinoma C. Sjogren's syndrome D. Pleomorphic adenoma # Sjogren's syndrome includes al...