Dentosphere : World of Dentistry

# Which of the following are true about direct pulp capping? A. Mechanically exposed teeth have a greater success rate than carious exposures B. Final restorative materials do not affect success C. Generally, individual teeth involved in a fixed prosthesis are candidates for direct pulp capping D. All of the above The correct answer is A.  Mechanically exposed teeth have greater success rate than carious exposures.

# The ‘FLUORIDE BOMBS’ is related to: A. A fluoride  capsule with high ppm of fluoride varnish B. A hypoplastic lesion on tooth seen in fluorosis areas C. Undiagnosed hidden caries D. Procedure to treat rampant caries The correct answer is C. Undiagnosed hidden caries. Occult or hidden caries is used to describe such lesion which is not clinically diagnosed but detected only on radiographs. Occult lesions are seen with low caries rate which is suggestive of increased fluoride exposure. It is believed that increased fluoride exposure encourages remineralization and slows down the progress of the caries in the pit and fissure enamel while the cavitation continues in dentin, and the lesions become masked by a relatively intact enamel surface. These hidden lesions are called 'fluoride bombs' or fluoride syndrome.

# Calcium hydroxide is advocated as an inter appointment intracanal medication because of: A. Its ability to dissolve necrotic tissue B. Its antimicrobial property C. Its ability to stimulate hard tissue formation D. Its powerful bleaching effect The correct  answer is B. Its antimicrobial property.  Most studies report culture reversals during the interappointment period when active antibacterial dressing is not used in the root-canal system between appointments. The reversals are due to regrowth of residual bacteria or recontamination by bacterial leakage around the access cavity dressing.  Classical and well-controlled studies (Sundqvist’s group) evaluated the effect of various root-canal treatment procedures on the microbiota both qualitatively and quantitatively. They tested the effect of mechanical preparation, saline or sodium hypochlorite irrigation (0.5%, 5.0%, 5.0% with EDTA), the addition of ultrasonic activation to the irrigation and calc...

# In the carious process, the initial dissolution of the tooth substance by acid takes place in which of the following place? A. Below the dentin Surface B. Below the enamel surface C. On the enamel surface D. Towards the dentin The correct answer is B. Below the Enamel Surface. The top portion of the tooth remains intact and it's the subsurface which looses the minerals. This is the stage where it's called as incipient lesion. Once the top protion breaks, it's called a cavitated lesion.

The correct answers are highlighted in green. # Micelles are the bodies related to:  A. Secretion of hormones  B. Secretion of enzymes  C. Absorption of minerals  D. Absorption of fat # Movements of circular muscles in the stomach is called  A. Digestion  B. Absorption  C. Excretion  D. Peristalsis

Sites Metabolic Pathways Mitochondria Citric acid cycle Oxidative phosphorylation Fatty acid oxidation Electron transfer Synthesis of ketone bodies Ribosomes Protein Synthesis Golgi Complex Glycoprotein synthesis Nucleolus RNA Synthesis Cytoplasm Cholesterol synthesis Glycolysis Fatty acid synthesis Glycogenesis Glycogenolysis HMP shunt Gluconeogenesis In both mitochondria and cytosol Urea Cycle Gluconeogenesis

# Clotting factor common to extrinsic and intrinsic pathway is: A. Factor II B. Factor III C. Factor V D. Factor VII The correct answer is C. Factor V. Prothrombin activator that is formed in intrinsic and extrinsic pathways converts prothrombin into thrombin in the presence of calcium (factor IV).  Once formed thrombin initiates the formation of more thrombin molecules. The initially formed thrombin activates Factor V. Factor V in turn accelerates formation of both extrinsic and intrinsic prothrombin activator, which converts prothrombin into thrombin. This effect of thrombin is called positive feedback effect.