Dentosphere : World of Dentistry

 #  Saw toothed Rete Pegs are seen in: A. Lichen planus B. Lichenoid reaction C. Leukoplakia D. Leukoedema The correct answer is A. Lichen Planus. Histopathologic examination of lesional tissue is the most relevant investigation in cases of Oral Lichen Planus. Typical findings include hyperparakeratosis or hyperorthokeratosis with thickening of the granular layer, acanthosis with intracellular edema of the spinous cells in some instances, the development of a ‘saw tooth’ appearance of the rete pegs. Band-like subepithelial mononuclear infiltrate consisting of T-cells and histiocytes; increased numbers of intraepithelial T-cells; and degenerating basal keratinocytes that form colloid (Civatte, hyaline, cytoid) bodies, which appear as homogenous eosinophilic globules are consistently seen. CLICK HERE FOR MORE MCQs

 #  Bleeding joints is a characteristic feature of: A. Vitamin C deficiency B. Vitamin K deficiency C. Hemophilia D. Thrombocytopenia The correct answer is C. Hemophilia. Patients with hemophilia exhibit persistent bleeding, either spontaneous or following even slight trauma that produces the mildest of abrasions or cuts. Hemorrhage into the subcutaneous tissues, internal organs, and joints is also a common feature and may result in massive hematomas. CLICK HERE FOR MORE MCQs

 # An asymptomatic tooth has deep caries on occlusal surface. Radiograph shows radiopaque mass at apex of the tooth. This  mass is most likely to be: A. Cementoma B. Condensing osteitis C. Chronic apical periodontitis D. Acute apical periodontitis The correct answer is B. Condensing osteitis. In condensing osteitis, radiographs demonstrate radiopacity which is not attached to tooth, entire root outline is visible, lamina dura intact and periodontal ligament is widened. These features differentiate it from cementoblastoma, in which the radiopacity is attached to tooth, lamina dura absent and root outline is not visible. In condensing osteitis the tooth may be vital or non-vital. CLICK HERE FOR MORE MCQs

 # In a leukemic patient, bleeding does not stop because: A. Decreased platelet count  B. Increased WBC count C. Decreased calcium level D. Decrease in coagulation level The correct answer is A. Decreased Platelet Count The sign and symptoms of acute leukemia result from either bone marrow suppression or infiltration of leukemic cells into organs tissues. These changes cause anemia, thrombocytopenia and a decrease in neutrophils. Thrombocytopenia causes spontaneous bleeding such as petechiae, ecchymoses, epistaxis, melena. It may necessary to perform surgery on patients with platelet counts in the range of 25,000 because of the difficulty in achieving platelet levels due to circulating platelet antibodies. CLICK HERE FOR MORE MCQs

 # Diamond Blackfan anemia is characterized by: A. Inherited thrombocytopenia  B. Inherited leucopenia C. Erythroid aplasia D. All of the above The correct answer is C. Erythroid aplasia. Diamond–Blackfan anemia (DBA) is a congenital erythroid aplasia that usually presents in infancy. DBA causes low red blood cell counts (anemia), without substantially affecting the other blood components (the platelets and the white blood cells), which are usually normal. This is in contrast to Shwachman–Bodian–Diamond syndrome, in which the bone marrow defect results primarily in neutropenia, and Fanconi anemia, where all cell lines are affected resulting in pancytopenia. First noted by Hugh W. Josephs in 1936, the condition is however named for the pediatricians Louis K. Diamond and Kenneth Blackfan, who described congenital hypoplastic anemia in 1938.  CLICK HERE FOR MORE MCQs

# Reduction of flow of saliva is not generally seen in: A. Elderly diabetes B. Patient undergoing radiation C. Patient suffering from parkinsonism D. Patient of Phenothiazine drugs The correct answer is C. Patient suffering from Parkinsonism. Xerostomia : It is the subjective clinical condition of less than normal amount of saliva. It is dryness of mouth, which is a clinical manifestation of salivary gland dysfunction. Causes: - Radiation induced - Pharmacologically induced xerostomia—there are about 500 drugs which can cause xerostomia. The classes of drugs which cause xerostomia include anticonvulsants, antiemetics, antihistaminics, anti-hypertensives and antispasmodics. The mode of action for decreased salivary flow is generally related to the para-sympathetic activity, usually an antimuscarine effect. - Smoking, Mouth breathing - Developmental—developmental abnormalities of salivary glands, tumors, autoimmune states and certain diseases which affect afferent or efferent portions of...

# Which of the following condition shows marked reduction in the amount of dentin, widening of predentin layer, presence of large areas of interglobular dentin and irregular pattern of dentin? A. Hypocalcified dentin B. Regional odontodysplasia C. Dentin dysplasia D. Dentinogenesis imperfecta The correct answer is B. Regional odontodysplasia. The most characteristic features of Regional odontodysplasia are the marked reduction in the amount of dentin, the widening of the predentin layer, the presence of large areas of interglobular dentin, and an irregular tubular pattern of dentin. CLICK HERE FOR MORE MCQs