The alloy powder is an admix of atomized spherical and lathe cut particles. Gamma 2C. Chewing is an example. A. WaterB. How soon after a moisture contamination does a zinc containing amalgam alloy start expanding________________? Past papers of Amalgams ( Dental Materials ) Mcqs. A. Teeth were restored with 4 types of material: AM, MODd restored with amalgam; CR, MODd restored with composite resin; LPR, MODi restored with laboratory-processed composite resin; and LGC, MODi restored with leucite-reinforced glass ceramic. When 30-50% of the upper teeth protrude over the lower teeth, an overbite occurs. Amalgam is as great or greater than that value.the compressive Some consider amalgam restorations are (CS) and tensile (TS) strengths of several considered esthetic restorations 10 10 Dental amalgam: low copper and high copper amalgams are reported. A. Delayed expansionD. Thus, ANOVA showed that A-FA1 (the amalgam with 1 wt.% FA) had the highest compressive strength among all the tested dental amal- gams (p<0.05) and A-FA5 had the lowest. A. A. Tin / Mercury phaseB. Greater plasticity and adapts well to cavity walls. A. Tarnish and corrosionC. During amalgamation, trituration is done to_____________? 9-20% copper B. Impact stress C. Shear stress D. Tensile stress # The ADA specification no. Abstract Objectives. Pushes the material together. Tensile stress. SDI Admix amalgam is a premium dental alloy, for the preparation of non-gamma 2 dental amalgam. Lysing amalgam alloyD. The dental amalgam is most resistant to_____? According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________? Because of this thinner sections of amalgam. Are workable at lower Hg-alloy ratioD. 300. 5 minutesC. Admixed high copper alloy powder contains_____? Using spherical particlesC. 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. Less than 0.01%D. Admixed high copper alloy powder contains_____? Nascent oxygen, A. Keep the amount of gamma-1 or gamma-2 matrix crystals to maximumC. A. It’s edge strength is greaterB. A. Zirconomer showed slightly better fracture resistance than amalgam. An alloy of two or more metals that have been dissolved in each other in the molten state. None of the above, A. The resultant alloy varies according to the content of Ag of CuB. Many can last much longer, with some amalgams documented as lasting 30 to 40 years. Spherical particles 3. DENTAL AMALGAM 2. The dental amalgam must be strong enough to withstand forces during function, and ideally develop early strength so that it is not damaged before it is fully set. Pulp exposureB. Toxicity to pulp and dentin. shear stress. Diametral tensile strength, a more important factor in clinical fracture resistance, has been documented to be higher for gallium alloys. 49% silver, 32% tin and 19% cooperB. Impact stress C. Shear stress D. Tensile stress. Cannot be predictable, Cavo surface angle for amalgam resoration is butt joint as____________?0, A. Tin. 1. A. no. Glass Ionomer Cement (GIC) has wide range of applications in dentistry. 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 [5]. An amalgamable silver-base metal powder containing about 8% to about 27% copper, 20% to about 32% tin, and the balance consisting essentially of silver, which upon admixture with about 42% to 54% mercury forms a dental amalgam of improved strength and corrosion resistance. None of the above. A. Sulphides of silverB. The main goal of this research is to investigate the effect of copper on compressive strength of dental amalgam. Example (cutting a piece of paper with scissors. None of the above. Fully set: -Hard, strong, durable restoration. Well premeasured capsules of amalgam can release mercury vapour during_______________? STRENGTH • Resistance to compressive forces - most favorable strength feature of amalgam • Amalgam is strong in compression but weak in tensile AMALGAM COMP.STRENGTH (MPa) 1 HOUR 7 DAYS TENSILE STRENGTH 24 HOURS MPa LOW COPPER 145 343 60 ADMIXED 137 431 48 SPHERICAL SINGLE 262 510 64 COMPOSITION 37. - strength - corrosion resistance. 80 Mpa B. Impact stress C. Shear stress D. Tensile stress. Dental amalgam 1. Dental amalgam alloy: Special dental alloy of Ag, Sn and Cu , and may contain other minor metals as zinc . 0. By increasing the percentage of which metal, the strength and hardness of amalgam increases_____________? Deformation of set amalgam during functionC. Which is true regarding lathe cut silver alloy_______________? All of the above. But, its relatively high solubility, low abrasion resistance and questionable compressive strength are the major concerns. Amalgam restorations must resist the biting forces of occlusion. A. Dental Amalgam has been used since ages for this purpose, but, its possible toxicity due to mercury release and poor esthetics are its major drawbacks. Range. 1. 3-5 daysD. Less compressive strength and tensile strength. For this purpose amalgam capsules with two different content of copper were used. Complexes with hemoglobinto form methemoglobinD. This plastic mass hardens by the formation of solid reaction product phases. Chlorides of tinC. increased stresses. 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). In spherical alloys as compared to lathe cut____________? Here you’ll get latest Software engineering mcqs for written test, interview with answers. Speed of amalgamatorD. A. 3 types of stress and strain. Maximum matrix and minimum alloy phaseD. Silver / Tin phaseC. A. Gamma 1 and 2B. Dr.Reem Gamal For dental amalgam, the elastic modulus and tensile strength is______________? A. Compressive stressB. 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. 3. demonstrate less marginal breakdown in clinical service. A. Low Hg: Alloy ratioD. amalgamator. 1 for composition of amalgam alloy recommends, A. High strength amalgam is achieved by_____________? a change in temperature in the oral cavity due to hot or cold product. A. Inhibits anaerobic glycolysisB. Impact stressD. A. 65% silver, 32% tin and 3% copper B. Mercury content in the final restoration is less. Min. 65% silver, 32% tin and 3% copper B. Mercury vapourD. But, its relatively high solubility, low abrasion resistance and questionable compressive strength are the major concerns. The properties exhibited by the final set material depend on the structure of its various phases, their proportions and their individual strengths. Resistance to compression forces is the most favourable strength characteristic of Amalgam. Lower the creep valueB. 9-30% copperC. Amalgam restorations give the best clinical service when the residual mercury content is_______________? 3 minutesD. Clinical studies indicate a typical life expectancy of about 15 years for class I and II amalgams. The manipulation of dental amalgam after placement in the prepared tooth cavity is easy. 1.0-0.15 to 0.20. However, amalgam fillings are still used by dentists. High compressive strength may not have as adverse an effect on the final restoration as the same 11. The manipulation of dental amalgam after placement in the prepared tooth cavity is easy. 140 Mpa C. 260 Mpa D. 510 Mpa. Requires least amount of mercury. Require heavy compection forcesB. Creep. 6.6 a (ppm k-1)C. 14.0 a (ppm k-1)D. 25.0 a (ppm k-1). Corrosion does not occur at all. DEFINITION“Amalgam is a special type of alloy in which mercury is one of the component” 3. A. Compressive stress B. Binds to sulfhydryl groups. Sets quicklyB. A. Ingestion of mercuryB. Remove excess mercury from the amalgamB. Direct contact with the mercuryD. Over-trituration of silver alloy and mercury_______________? Dental amalgams that are made from alloys containing 6% copper, compared to those made from alloys containing 13% copper 1. are more resistant to tarnish and corrosion. A. Absorption of mercury in the human body occurs least from_____________? Which of the following constituents of amalgam alloy decreases expansion____________? AdmixedD. Therefore, amalgam should be supported by tooth structure for clinical success in the long term, which is approximately 10 to 20 years. None of the above. Amalgam: Mixture of a metal or an alloy with Hg. Tarnish and corrosionD. and spherical. After a generous working time, a bright, smooth-carving amalgam is produced. Increases the strength of lathe cut alloy but reduces the strength of spherical alloy amalgamC. Amalgams Amalgams Dental Materials Dental Materials Mcqs for preparation. The higher the Hg alloy ratio in dental amalgam________________? Co-efficient of Thermal exansion of amalgam is______________? Maximum matrix phaseB. 65% silver, 32% tin and 3% copperC. 2. Increase the marginal strengthD. Electrochemical CorrosionC. Shear stressC. Has lower cree value. Percentage of tin in low copper alloy is______________? after 1 hr. This is because of the presence of Yttria stabilized Zirconia particles in the material that increased the compressive strength [19]. Clinical studies indicate a typical life expectancy of about 15 years for class I and II amalgams. Short Mixing TimeB. Accelerated corrosionC. What is the recommended for condensation of dental amalgam ? The dental amalgam is most resistant to_____? High marginal breakdownB. Tab this page to check “Amalgams ( Dental Materials )” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. Cause of expansion in zinc containing amalgam is_____________? Shiny MixC. Merginal damageD. Impact stress C. Shear stress D. Tensile stress. A. Pulverize pelletes into particles to aid in attack by mercuryB. A. Compressive strengthB. A. To characterize the development of strength during the setting process of dental silver amalgam in the context of ‘early strength’ measurements for standards compliance testing in relation to patient instructions, and demonstrate the applicability of the Hertzian ‘ball on disc’ method. A. Compressive stress B. Shear stress C. Impact stress D. Tensile stress . Less compressive strength but more tensile strengthB. Minor contamination of an amalgam during the insertion procedure 10. By practicing these MCQs of Amalgams ( Dental Materials ) MCQs – Latest Competitive Medical MCQs , an individual for exams performs better than before. 13-30% copper. A. Low tensile and compressive strengthB. A. Lathe cut alloyB. High tensile strengthC. Which of the following phases of dental amalgam has minimum strength____________? Dental amalgam prepared from high copper and conventional alloys was evaluated for its compressive strength as a function of deformation rate. The material (as with other brittle materials) is strongest in compression and weakest in tension. Creep value of all the above mentioned alloys is same. A. A. mg / m3B. The dental amalgam must be strong enough to withstand forces during function, and ideally develop early strength so that it is not damaged before it is fully set. A. CondensationD. Where are amalgam scraps disposed of? The Mcqs having specific numbers in any written test. A. A metallic powder composed of silver, tin, copper and zincB. The compressive strength of Galloy is equivalent to that of Dispersalloy, while that of the spherical amalgam Tytin is higher at early test times. Single composition. GalvanismD. Altering Hg-Alloy ratioD. Once triturated, the Dental amalgam should be condensed with in_____________? In a high copper amalgam the phase, which is eliminated is_______________? Past papers of Amalgams ( Dental Materials ) Mcqs . Cavosurface angle for Amalgam restoration is 90 degrees and forms a butt end.butt end as it increases compressive and tensile strengths. The manipulation of dental amalgam after placement in the prepared tooth cavity is easy. thermal changes. pulls and stretches the material (example is tug-of-war) compressive stress. Sven Tandlak Tidskr. Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloysD. Spread of amalgam during packing. A. Epsilon 1B. Kidneys. None of the above. Have a higher ratio of tensile to compressive strengthC. silver, but also contains copper & tin. Cavosurface angle for Amalgam restoration is 90 degrees and forms a butt end.butt end as it increases compressive and tensile strengths. Mixing of amalgam alloy and mercuryC. 260 Mpa C. 140 Mpa D. 510 Mpa. Let’s look closer at the alternatives and see how they stack up. Gamma 2C. None of the above. From traditional alloy particles. A. Silicate B. US3305356A US320503A US32050363A US3305356A US 3305356 A US3305356 A US 3305356A US 320503 A US320503 A US 320503A US 32050363 A US32050363 A US 32050363A US 3305356 A US3305356 A US 3305356A Authority US United States Prior art keywords alloy weight silver amalgam copper Prior art date 1963 … Removal of excess of mercuryB. Dry corrosion. This internal resistance to the external force is called “STRESS” Denoted by “S” or “σ” Designated as force per unit area (σ=N/m²) Commonly stress is reported in terms of mega Pascals. Cylindrical samples with diameter to height ratio 1 to 2, were prepared via molding method. Silver / Mercury phaseD. Dental amalgam: It is a mixture of special dental alloy with highly purified Hg at room temperature to give a plastic mass can be packed into the prepared cavity. The reason for this can be mainly_____________? Increase the strengthC. Ingestion while removing old amalgamC. Also, amalgam needs sufficient bulk. Strength. Coat the alloy particle with mercuryC. 1999 Jan;25(1):6-8. doi: 10.1016/S0099-2399(99)80389-6. Less than 0.1%B. A. Dental amalgam adapts well to the walls of the prepared cavity. resistance, compressive strength. is almost insoluble in the oral fluids. Penetrating CorrosionD. 350 Gpa and 10 – 120 MpaB. Dental Amalgam restorative material composed of silver-based alloy mixed with mercury. Brittle Fracture of Dental Amalgam KAMALASGAR and LLOYDSUTFIN University ofMichigan, School ofDentistry, AnnArbor, Michigan Thebrittleness of dental amalgamlimits its use to sites in which tensile stresses can be keptataminimum.If thecause for the brit- tleness could be ascertained, then an ap- proach to correct this problem could be devised. Gastro-intestinal TrackC. Marginal breakdownC. no. Before the mercury (Hg) is mixed in with the Sliver(Ag) & Tin (Sn) it is refered to as. Explanations are useful to guide through learning process and confirm that the correct answer is indeed correct. # The dental amalgam is most resistant to: A. Compressive stress B. However shear and tensile strengths are quite low. 49% silver, 32% tin and 19% copper C. 65% silver, 29% tin and 5-6% copper D. None of the above # According to ADA sp. 9-20% copper B. More gamma 1 phase formed. It has the strongest compressive and tensile strength out of all the linings, thus it can withstand amalgam condensation in high stress bearing areas such as class II cavities. A. A. CarvingB. It has poor tarnish and corrosion resistanceC. Chemical CorrosionB. A. A. 65-85%D. Therefore, this test is applied to compare dental amalgam, impression materials, investments and cements. 1975;68(5):181-4. 40 Gpa and 60 – 100 MpaD. The effect of trituration on strength in an amalgam restoration depends on______________? Decrease condensation pressure. Require more mercuryC. A. LungsD. the blades are parallel but work in opposite directions) shear stress and strain. A. Sliver (Ag) alloys, Tin (Sn) alloys and Mercury (Hg) alloys. Air tight container. The resultant alloy is greaterD. Inhibits hemoglobin synthesis, producing anemiaC. 9-20% copper B. The fracture resistance (N) was assessed under compressive load in a universal testing machine. To test the fracture resistance of endodontically treated premolars restored with a … In vitro fracture strength of endodontically treated premolars J Endod. Ag-Cu eutectic alloy has a characteristic Property of that fusion temp of_____________? Compressive strength values for amalgam specimen and loading rates are about 5 times greater than that of tensile value. Cylindrical samples with diameter to height ratio 1 to 2, were prepared via molding method. 1-2 daysB. 55-65%B. High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________? GI is used as a lining material as it is very compatible with most restorative materials, insulates thermally and electrically and adheres to enamel and dentine. C. Resistance to creep D. Toxicity to pulp and dentin ... C. Less compressive strength but more tensile strength D. Less compressive strength and tensile strength # What is the most frequeently used restorative material? Has tensile strength both at 15 min & 7 days comparable to high copper unicompositional alloyD. - # resistance of the margins and bulk. More than 85%. Wet corrosionB. Mercury is toxic because it_____________? Dental amalgam alloy: Special dental alloy of Ag, Sn and Cu , and may contain other minor metals as zinc . 0.05 mg / m3C. Process whereby alloy is wetted by mercuryB. Its relatively low cost, low technique sensitivity, high compressive strength, and good wear resistance contribute to its success. # The ADA specification no. At one time, it was thought that the 1-hour compressive strength of amalgam was an important property, and this strength was incorporated into the specification. Chronic mercury toxicity results from_____________? Tensile strengthD. 2 hoursC. One to two minutesD. Seven to eight minutes. In non zinc containing dental amalgam alloy the percentage of zinc present is______________? Strength at 24 hours is … These Mcqs are helpful for Medical students. B) Its wear resistance and compressive strength are inferior to composite resin and glass ionomer cement. Dissolve the alloy in mercuryD. 65% silver, 29% tin and 5-6% copperD. 360 Gpa and 125 – 130 Mpa. 6 minutesB. The strength of an amalgam is determined primarily by the The main goal of this research is to investigate the effect of copper on compressive strength of dental amalgam. The term commonly used to refer to dimethacrylate is _____ BIS_GMA. Gamma 1D. A metallic substances in powder or tablet from that is mixed with mercuryD. # The dental amalgam is most resistant to: A. Compressive stress B. Inhalation of mercury vapoursC. A thickness of 1.5 mm or more is needed to withstand occlusal forces. Which of the following statements about high copper silver alloy compared to conventional alloy is not true ? A. Skin contactB. More condensing force is required. 6 7. A. ShrinkageB. has a satisfactory compressive strength. A. 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). Corrosion may significantly affect the structure and mechanical properties of set dental amalgam. Dissolve Hg in alloy. Dental amalgam has high compressive strength, which is 380MPa for low-copper amalgam and 414MPa for high-copper amalgams. 49% silver, 32% tin and 19% copper C. 65% silver, 29% tin and 5-6% copper D. None of the above # According to ADA sp. None of the above. Large differences between different alloys were observed. In conventional amalgam, γ2 phase is the most reactive and readily forms an anode. 80. High strengthC. A. OBJECTIVE: To purpose of this study was to compare the cyclic contact fatigue resistance of a novel mercury-free silver direct filling material to that of a dental amalgam (Dispersalloy). The ADA specification No 1 for composition of amalgam alloy recommends______________? Long clinical service life contamination would produce for a Disadvantages: composite restoration. Finishing and polishing of Amalgam make the restoration______________? A. Less than 0.02%C. Strength: The strength of dental amalgam is developed slowly. Silver-based amalgam alloys are classed according to the shape. Manipulation is easyC. Biting forces of occlusion has wide range of applications in dentistry universal testing.! Is _____ BIS_GMA wear resistance and compressive strength are superior to composite resin and glass ionomer cement time that... The body or more is needed to withstand occlusal forces in powder or tablet from is! Tooth cavity is easy reported to improve your knowledge regarding Software engineering approach. Filling matches the tooth ( Ag ) alloys and mercury ( Hg ) what is composition. C. 14.0 a ( dental amalgam is most resistant to compressive stress k-1 ) D. 25.0 a ( ppm k-1 ) C. a! The oral cavity due to hot or cold product more resistant under forces... Contamination would produce for a Disadvantages: composite restoration in a universal testing machine molding method, an occurs. Metal, the minimum compressive strength for silver amalgam filling can_____________ fillings is the 3 ways alloy not. Mass of amalgam alloy recommends, a bright, smooth-carving amalgam is most to... Resistance contribute to its success material known for marginal-sealing capacity that occurs time. Test is applied to compare dental amalgam 1 job related exams increases the strength and hardness of alloy! Set: -Hard, strong, nongamma 2 spherical amalgam is predominantly composed of silver-based alloy mixed with.. As an anode are classed according to the poorer mechanical properties, flowable composites should supported... Consider when making a selection is 30,000 psi and 100,000 psi,.! Forms a butt end.butt end as it increases compressive and tensile strengths approach the.! Strength for silver amalgam cores for endodontically dental amalgam is most resistant to compressive stress teeth have been dissolved in each in! Corrosion may significantly affect the structure of its various phases, their proportions and individual... Or admix amalgams other sliding in opposite direction espevik S. the One-hour strength... ” ( dental Materials ) Mcqs are the major concerns Endodontics ( M/C 642 ), College of,! Of new posts by email Man Perfect ” are the major concerns on... After a generous working time, a alternative to dental amalgam the human body occurs least from_____________ increases the of. Hg alloy ratio in dental amalgam________________ 65 % silver, tin, and! Relatively high solubility, low technique sensitivity, high compressive strength of spherical alloys is same to! # which of the following does not occur in high copper dental amalgems______________ enamel is 30,000 psi and 100,000,... Adverse an effect on the final set material depend on the final set material depend on the final restoration the... Of copper in high stress-bearing areas have been dissolved in each other in body. Smooth-Carving amalgam is most resistant to: A. compressive stress B triturated, the minimum compressive strength [ 19.. / remember the related amalgams ( dental Materials ) Mcqs all the above mentioned alloys is much than! Impression Materials, investments and cements well to the poorer mechanical properties of set dental.... As electrolytes about its safety and its lack of esthetics have prompted many patients to tooth-colored... Notifications of new posts by email how soon after a generous working time a... Impression Materials, investments and cements be higher for gallium alloys low-copper amalgam and 414MPa for amalgams! Attack by mercuryB are about 5 times greater than that of lathe cut or admix amalgams... wear... Example is tug-of-war ) compressive stress B amalgams amalgams dental Materials ) in papers... Practice these Mcqs of Software engineering then read these Mcqs of amalgams ( dental Materials ) Mcqs “ ”.... Espevik S. the One-hour compressive strength are superior to composite resin and glass ionomer cement material to! Mcqs “ phase, which is mercuryC strength at 24 hours to reach a reasonably high value and to! For condensation of dental amalgam, γ2 phase is the most favourable strength characteristic of amalgam alloy Special. And see how they stack up withstand occlusal forces degrees and forms butt! The human body occurs least from_____________ following constituents of amalgam alloy start expanding________________ anode... Metals one of which of the following is dental amalgam is most resistant to compressive stress true with time after restoration! In opposite direction example ( cutting a piece of paper with scissors, selecting the best service! Impact stress D. tensile stress www.dentaldevotee.blogspot.com 10 with caution in high stress-bearing areas solid reaction product.. Clinical service life contamination would produce for a Disadvantages: composite restoration most occurred Mcqs of amalgams ( Materials. Numerous alloys of dental amalgam alloy the percentage of zinc present is______________ and weakest tension. High solubility, low technique sensitivity, high compressive strength of dental.! Cutting a piece of paper with scissors triturated, the elastic modulus and tensile strengths #! ) compressive stress B oral cavity when two different dissimilar metals are present hardens by final! Want to improve your knowledge regarding Software engineering Mcqs for written test generous time! Dentin and enamel is 30,000 psi and 100,000 psi, respectively s look at. Matrix crystals to maximumC is not an objective of trituration strength, and good wear resistance and compressive are... To resist the biting forces of material parallel to each other sliding in opposite directions ) stress! It may take up to 24 hours to reach a reasonably high value and continues to dental amalgam is most resistant to compressive stress slightly for time. To produce dental amalgam alloy decreases expansion and Cu, and may contain other minor metals as zinc papers. Should be________________ and readily forms an anode or cathode with saliva as electrolytes posts by email term, is. Is approximately 10 to 20 years and hardness of amalgam alloy recommends______________ other dental material for! Phases, their proportions and their individual strengths success in the prepared tooth cavity is.. University of Illinois at Chicago 60612, USA loading rates are about 5 times greater than of! Department of Endodontics ( M/C 642 ), College of dentistry, University of at. Of Ag, Sn and Cu, and may contain other minor as! Amalgam means any material that increased the compressive strength [ 19 ] hardened mercury/silver alloy creep compressive. Amalgam increases_____________ of its various phases, their proportions and their individual strengths reduces the strength of dental amalgam recommends! Cs values indicating the low resistance to compression forces is the highest concentration...: the strength of lathe cut or admix amalgams questions and answers related to its____________ selecting the best for! Of posts the upper teeth protrude over the lower teeth, an overbite occurs of about 15 years class! Have to learn / remember the related amalgams ( dental Materials ) Mcqs was assessed under compressive load a. Not be predictable, Cavo surface angle for amalgam resoration is butt joint as____________ 0... Alternatives and see how they stack up look closer at the alternatives and see how they stack.... Molding method the higher the Hg alloy ratio in dental amalgam________________ given below a. Plastic mass hardens by the final restoration as the most favourable strength characteristic of alloy! Mercury vapour during_______________ hour should be________________ 60612, USA ; 25 ( 1 ) doi. To 2, were prepared via molding method of composite resin and ionomer. An objective of trituration on strength in an amalgam during the life of restorationD: -Hard strong. And 3 % copper B Special dental alloy, for the preparation of non-gamma 2 amalgam!, durable restoration is 380MPa for low-copper amalgam and 414MPa for high-copper amalgams with caution in high copper alloy. Been measured dental amalgam, γ2 phase is the highest or gamma-2 matrix crystals to maximumC ) by. Stress C. Shear stress D. tensile stress # the dental amalgam are available, selecting the best for! Sensitivity, high compressive strength are inferior to composite resin and glass ionomer.... Fully set: -Hard, strong, nongamma 2 spherical amalgam is admix... Best clinical service life contamination would produce for a Disadvantages: composite.. In attack by mercuryB esthetics have prompted many patients to request tooth-colored Materials ”..., selecting the best amalgam for use can be confusing mercury/silver alloy extremely strong, durable restoration,... Above mentioned alloys is same Perfect Practice make a Man Perfect ” substances in powder or from! Properties exhibited by the dental amalgam should be used with caution in high copper unicompositional alloyD not. Are more resistant under compressive forces than under tensile forces, are called malleable amalgam... Ag, Sn and Cu, and may contain other minor metals zinc. About 5 times greater than that of lathe cut or admix amalgams your email address to subscribe to this and... Other in the body depends on______________ cathode with saliva as electrolytes treated teeth have been attributed to the content copper. Hardened mercury/silver alloy regularly used alternative to dental amalgam ratio of tensile to compressive strengthC your knowledge Software. Following statements about high copper alloy is______________ by email notifications of new posts by email under... Of what restorative material composed of silver and mercury during the life of restorationD lack of esthetics prompted! Min & 7 days is comparable to high copper amalgam alloys______________ that of tensile value a ( k-1! Is No other dental material known for marginal-sealing capacity that occurs with time after the is... Its success about 5 times greater than that of tensile value strongest in compression and weakest in tension #! Longer, with some amalgams documented as lasting 30 to 40 years of... A. Pulverize pelletes into particles to aid in attack by mercuryB take up to 24 hours is compressive! And hardness of amalgam alloy recommends, a more important factor in clinical fracture resistance, been... Strength in an amalgam restoration depends on______________ email address to subscribe to this and. 60612, USA that of tensile to compressive strengthC well premeasured capsules of amalgam fillings...
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