2. Facebook. Gastro-intestinal TrackC. After a generous working time, a bright, smooth-carving amalgam is produced. Has lower cree value. Authors A Steele 1 , B R Johnson. with amalgam were most fracture resistant. Inhibits hemoglobin synthesis, producing anemiaC. DEFINITION“Amalgam is a special type of alloy in which mercury is one of the component” 3. Strength at 24 hours is … Single composition alloysC. AdmixedD. Absorption of mercury in the human body occurs least from_____________? GalvanismD. silver, but also contains copper & tin. Gives al dull and crumbly amalgam. Have longer setting timesD. Silver-based amalgam alloys are classed according to the shape. From traditional alloy particles. The compressive strength of dental amalgam (380 − 540 MPa) develops progressively after trituration but tensile (57 MPa) and flexural (114 MPa) strengths are much lower, making amalgam brittle . There is no other dental material known for marginal-sealing capacity that occurs with time after the restoration is … This is because of the presence of Yttria stabilized Zirconia particles in the material that increased the compressive strength . Tarnish and corrosionC. Decrease the tarnish and corrosion resistanceC. This is because of the presence of Yttria stabilized Zirconia particles in the material that increased the compressive strength . The most occurred mcqs of Amalgams ( Dental Materials ) in past papers. 1999 Jan;25(1):6-8. doi: 10.1016/S0099-2399(99)80389-6. A. A. - Corrosion Resistance. Admixed high copper alloy powder contains_________________? Delayed expansionD. LungsD. A. 0. Increased compressive strength. Requires least amount of mercuryC. DENTAL AMALGAM 2. A. SDI spherical amalgam. Cylindrical samples with diameter to height ratio 1 to 2, were prepared via molding method. Low tensile and compressive strengthB. High compressive strength may not have as adverse an effect on the final restoration as the same 11. Cause of expansion in zinc containing amalgam is_____________? Cylindrical samples with diameter to height ratio 1 to 2, were prepared via molding method. Which of the following statements about high copper silver alloy compared to conventional alloy is not true ? a change in temperature in the oral cavity due to hot or cold product. Admixed high copper alloy powder contains_____? Impact stress C. Shear stress D. Tensile stress. But, its relatively high solubility, low abrasion resistance and questionable compressive strength are the major concerns. Min. 24 hoursC. A patient who has had a recent amalgam filling in the upper teeth has a gold filling in the lower teeth, the patient complains of pain. 49% silver, 32% tin and 19% copper C. 65% silver, 29% tin and 5-6% copper D. In the centre of the restorationD. For this purpose amalgam capsules with two different content of copper were used. This post comprising of mechanical engineering objective questions and answers related to “Amalgams ( Dental Materials ) Mcqs “. CondensationD. The main disadvantage of amalgam tooth fillings is the color. Mercury is liquid at room temperature , it reacts with other metals that are in solid state, to form a plastic mass, which can be conveniently packed into a prepared tooth preparation. A. Achieves high compressive strength at 1 hr.B. Less compressive strength but more tensile strengthB. Past papers of Amalgams ( Dental Materials ) Mcqs . Setting time of Amalgam is best controlled by _______________? Chewing is an example. and spherical. Using spherical particlesC. An alloy of two or more metals one of which is mercuryC. Spherical particles 3. Lysing amalgam alloyD. The dental amalgam is most resistant to_____? Higher the strengthC. Dental amalgam has a high compressive strength, but the tensile and shear strengths are comparatively low. The manipulation of dental amalgam after placement in the prepared tooth cavity is easy. The multiphase structure of dental amalgam can contribute as an anode or cathode with saliva as electrolytes. Decreased compressive, decrease tensile strengthC. The material has low creep, high compressive strength, and high resistance to wear, and it experiences minimal dimensional change with time (George et al., 2009; ADA, 2011; Uçar and Brantley, 2011). comparison, the compressive strength of dentin and enamel is 30,000 psi and 100,000 psi, respectively. Clinical studies indicate a typical life expectancy of about 15 years for class I and II amalgams. Biting forces of occlusion abrasion resistance and compressive strength may not have as adverse an on. 1 ):6-8. doi: 10.1016/S0099-2399 ( 99 ) 80389-6 the most favourable strength characteristic of amalgam have. 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