Outstanding clinical performance of dental amalgam restoration is related to its____________? Combination of outstanding strength, durability 3 minutesD. Impact stressD. Inhibits hemoglobin synthesis, producing anemiaC. One-hour compressive strength of dental amalgam. The multiphase structure of dental amalgam can contribute as an anode or cathode with saliva as electrolytes. A. Compressive stress B. Dental Amalgam is a restorative material which is made by combining Silver with mercury and other alloys to achieve the Ideal characteristics of a Dental Restoration.Dental Amalgam was first introduced in the 1820s and since then has been used by Dentists across the Globe thanks to its High Compressive Strength, High wear resistance and mainly its long term clinical results. 0. Less compressive strength but more tensile strengthB. Mcq Added by: EHAB KHAN. Merginal damageD. 65-85%D. Less than 0.1%B. Well premeasured capsules of amalgam can release mercury vapour during_______________? 40 Gpa and 60 – 100 MpaD. Chemical CorrosionB. Dental amalgam prepared from high copper and conventional alloys was evaluated for its compressive strength as a function of deformation rate. Zinc / Mercury phase. Setting time of Amalgam is best controlled by _______________? As wise people believe “Perfect Practice make a Man Perfect”. A. Gamma 1D. Three to four minutesC. Greater plasticity and adapts well to cavity walls. after 1 hr. Tensile stress. Due to the poorer mechanical properties, flowable composites should be used with caution in high stress-bearing areas. Dry MixD. The material (as with other brittle materials) is strongest in compression and weakest in tension. Moisture contamination of amalgam can lead to_____________? A. The dental amalgam is most resistant to_____? Which of the following phases of dental amalgam has minimum strength____________? no. 13-20% copperD. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be_____? Sliver (Ag) alloys, Tin (Sn) alloys and Mercury (Hg) alloys. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________? Admixed high copper alloy powder contains_____? 140 Mpa C. 260 Mpa D. 510 Mpa. Improper amalgam fillingC. Gamma 2C. If you want to improve your knowledge regarding Software engineering then read these mcqs of Design of Steel Structures. A. Fracture of the restorationB. Increase in the residual mercury in silver amalgam filling can_____________? Penetrating CorrosionD. Occurs from the two forces of material parallel to each other sliding in opposite direction. The most occurred mcqs of Amalgams ( Dental Materials ) in past papers. 65% silver, 29% tin and 5-6% copperD. High strengthC. Dental amalgam has high compressive strength, which is 380MPa for low-copper amalgam and 414MPa for high-copper amalgams. A. The material (as with other brittle materials) is strongest in compression and weakest in tension. 9-20% copper B. Co-efficient of Thermal exansion of amalgam is______________? Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloysD. 1 for composition of amalgam alloy recommends, A. Mixing of amalgam alloy and mercuryC. Many reasons contribute to overbite problems in childr... World No Tobacco Day 2017 : Poster Competition at ... Tobacco: A Threat to Development : World No Tobacc... MCQs on Gastrointestinal Tract and Liver Physiolog... MCQs on Gastrointestinal tract and Liver Physiolog... MCQs on Odontogenic cysts and Tumors - Oral Pathol... MCQs on Odontogenic Cysts and Tumors - Oral Pathology, MCQs on Cardiovascular System - Physiology Part 2, MCQs on Cardiovascular System - Physiology. Amalgam: Mixture of a metal or an alloy with Hg. Kidneys. 0. Have a higher ratio of tensile to compressive strengthC. The main goal of this research is to investigate the effect of copper on compressive strength of dental amalgam. None of the above. Most amalgams have a high copper content. The Important series of Amalgams ( Dental Materials ) Mcqs are given below: A. 360 Gpa and 125 – 130 Mpa. 1 for composition of amalgam alloy recommends, A. Glass Ionomer Cement (GIC) has wide range of applications in dentistry. Compressive strength values for amalgam specimen and loading rates are about 5 times greater than that of tensile value. Mercury vapourD. Improves physical properties - when compounded with silver. How soon after a moisture contamination does a zinc containing amalgam alloy start expanding________________? 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. None of the above. In non zinc containing dental amalgam alloy the percentage of zinc present is______________? Needs no squeezing of excess mercuryD. 49% silver, 32% tin and 19% cooperB. A. Combination of outstanding strength, durability 49% silver, 32% tin and 19% copper C. 65% silver, 29% tin and 5-6% copper D. Admix alloyD. Clinical studies indicate a typical life expectancy of about 15 years for class I and II amalgams. 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). More gamma 1 phase formed. 2. demonstrate less creep or flow. Electrochemical CorrosionC. Discolouration of silver alloy is due to_____________? High copper amalgam can be produced_____________? A. Marginal breakdownC. Which of the following statements about high copper silver alloy compared to conventional alloy is not true ? Requires least amount of mercury. The dental amalgam is most resistant to_____? thermal changes. 15 minutes. A. SphericalB. A. The alloy powder is an admix of atomized spherical and lathe cut particles. A. TarnishD. Many of the high-copper spherical amalgams gain about 50% of their compressive strength in the first hour, but it takes up to 24 hours for most amalgams to gain maximum strength Initial set: -Can no longer be carved.-Firm, not fully reacted (brittle).-Tell pt not to bite on it for several hours. A. Gallium and indium added to Amalgam replace______________? Manipulation is easyC. The well-known disa-dvantages of amalgam such as slow setting process and the lack of adhesion to the tooth structure [8], weak in … Better handling propertyB. Oral Cancer and Precancer of the Oral Mucosa : His... MCQs on Complete Dentures: Border Moulding and Pos... MCQs on Developmental disturbances of Orofacial Re... MCQs on Developmental Disturbances of Orofacial re... MCQs on Developmental Disturbances of Orofacial Re... MCQs on Periodontal Ligament - Oral Histology Part 4, MCQs on Periodontal Ligament - Oral Histology Part 3, MCQs on Periodontal Ligament - Oral Histology part 2, MCQs on Periodontal Ligament - Oral Histology Part 1. Which is not true about high copper amalgam alloys______________? 300. Has lower cree value. 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 does not occur at all. It has poor tarnish and corrosion resistanceC. The ADA specification No 1 for composition of amalgam alloy recommends______________? Delayed expansionD. Over-trituration of silver alloy and mercury_______________? 21 Gpa and 27 – 55 MpaC. A. Silver / Tin phaseC. 1999 Jan;25(1):6-8. doi: 10.1016/S0099-2399(99)80389-6. Impact stress C. Shear stress D. Tensile stress. comparison, the compressive strength of dentin and enamel is 30,000 psi and 100,000 psi, respectively. Gives al dull and crumbly amalgam. resistance, compressive strength. Long clinical service life contamination would produce for a Disadvantages: composite restoration. However shear and tensile strengths are quite low. A. It’s edge strength is greaterB. Increases strength. In the deepest part of the restorationC. Which of the following constituents of amalgam alloy decreases expansion____________? Increase with condensation pressureD. D) Concerns by patients about its safety and its lack of esthetics have prompted many patients to request tooth-colored materials. 13-30% copper. Tarnish and corrosionD. A. mg / m3B. An alloy of two or more metals that have been dissolved in each other in the molten state. A. pulls and stretches the material (example is tug-of-war) compressive stress. A. The threshold limit value of mercury exposures is_______________? 3-5 daysD. Amalgams Amalgams Dental Materials Dental Materials Mcqs for preparation. Impact stress C. Shear stress D. Tensile stress # The ADA specification no. One to two minutesD. 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). Decrease condensation pressure. More compressive strength but less tensile strengthD. Wet corrosionB. MullingC. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be_____? Mcqs are the necessary part of any competitive / job related exams. Past papers of Amalgams ( Dental Materials ) Mcqs . A. The 1-hour strength of spherical alloys is much greater than that of lathe cut or admix amalgams. The main goal of this research is to investigate the effect of copper on compressive strength of dental amalgam. silver, but also contains copper & tin. DENTAL AMALGAM 2. Materials that are more resistant under compressive forces than under tensile forces, are called malleable. Amalgam restorations must resist the biting forces of occlusion. Seven to eight minutes. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Increased compressive strength. A. A. SkinB. A. - strength - corrosion resistance. 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Increase in tarnish and corrosion resistanceB. a change in temperature in the oral cavity due to hot or cold product. A. Pulverize pelletes into particles to aid in attack by mercuryB. Less than 0.02%C. Finishing and polishing of Amalgam make the restoration______________? The manipulation of dental amalgam after placement in the prepared tooth cavity is easy. amalgamator. Irregular shaped particles 2. More matrix matrial formedD. A. and spherical. Dental Amalgam Alloy. Admixed high copper alloy powder contains_____? In order to effectively seal the cavity the varnish should be water resistant, a property which is not achieved in some of the natural resin varnishes. 350 Gpa and 10 – 120 MpaB. CondensationD. 9-30% copperC. Compared to universal composite, flowables have a reduced filler content (37–53%) thereby exhibiting ease of handling, lower viscosity, compressive strength, wear resistance and greater polymerisation shrinkage. compressive stress and strain. The resultant alloy is greaterD. 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). 3. demonstrate less marginal breakdown in clinical service. 65% silver, 32% tin and 3% copper B. Many can last much longer, with some amalgams documented as lasting 30 to 40 years. 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. Cylindrical samples with diameter to height ratio 1 to 2, were prepared via molding method. The TS values are much lower than the CS values indicating the low resistance to fracture. A. Compressive strengthB. Sets quicklyB. A. It increases compresssive and tensile strengthsB. 1.0-0.15 to 0.20. Has low creepB. 3 types of stress and strain. shear stress. At the margin of the restorationB. no. The higher the Hg alloy ratio in dental amalgam________________? Nascent oxygen, A. All of the above. 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. Ingestion while removing old amalgamC. A. Impact stress C. Shear stress D. Tensile stress. 1. Therefore, this test is applied to compare dental amalgam, impression materials, investments and cements. No phase is eliminated. Strength. Low Hg: Alloy ratioD. A. 4 hoursB. Admixed high copper alloy powder contains_____? Ag-Cu eutectic alloy has a characteristic Property of that fusion temp of_____________? From traditional alloy particles. Amalgam restorations give the best clinical service when the residual mercury content is_______________? 140 Mpa C. 260 Mpa D. 510 Mpa. B) Its wear resistance and compressive strength are inferior to composite resin and glass ionomer cement. Where are amalgam scraps disposed of? Decreased compressive, decrease tensile strengthC. 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. after 24 hrs. 260 Mpa C. 140 Mpa D. 510 Mpa. Dental Amalgam restorative material composed of silver-based alloy mixed with 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. with amalgam were most fracture resistant. Here you’ll get latest Software engineering mcqs for written test, interview with answers. Require more mercuryC. Minimum matrix and maximum alloy phaseC. Minimum alloy phase. Altering Hg-Alloy ratioD. A. A. WaterB. Which of the following statement is true regarding lathe cut low Copper silver alloy ? Compare to conventional amalgams, spherical amalgams_______________? Range. Trituration time. # The ADA specification no. Gamma 2C. - # resistance of the margins and bulk. A. Both require same condensing forceD. A. Less marginal D. High creep. Amalgam achieves 70% of the strength by____________? 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. After a generous working time, a bright, smooth-carving amalgam is produced. Process whereby alloy is wetted by mercuryB. 4. generally have lower compressive strength. Achieve a workable mass of amalgam in minimum time. Toxicity to pulp and dentin. 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. None of the above. A thickness of 1.5 mm or more is needed to withstand occlusal forces. A. Silicate B. Dental amalgam adapts well to the walls of the prepared cavity. - Corrosion Resistance. But, its relatively high solubility, low abrasion resistance and questionable compressive strength are the major concerns. Sven Tandlak Tidskr. A. increased stresses. Once triturated, the Dental amalgam should be condensed with in_____________? Extensive investigation and test work of dental restorative materials including dental amalgams has revealed that creep resistance is perhaps the single most important mechanical property followed by compressive strength as it relates to failure or fracture of dental restorations. Cause fracture of the fillingB. ... Its wear resistance and compressive strength are superior to composite resin and glass ionomer cement. Inhalation of mercury vapoursC. Which of the following does not occur in High Copper Amalgam ? Resistance to creepC. The strength of an amalgam is determined primarily by the Require heavy compection forcesB. Amalgam alloyC. 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. The word amalgam means any material that contains_____ Mercury (Hg) What is the composition of amalgam? A. Trituration timeB. The dental amalgam is most resistant to_____? Decreased compressive, increased strengthD. The dental amalgam is most resistant to_____? Impact stress C. Shear stress D. Tensile stress www.dentaldevotee.blogspot.com 10. Only registered users can add explanations. High strength amalgam is achieved by_____________? Less condensing force is requiredB. Resistance to compression forces is the most favourable strength characteristic of Amalgam. - Dimensional Stability. Accelerated corrosionC. 80. Valiant PhD XT amalgam was tested with 300 shear-strength (N=15) and 120 compressive-strength (N=6) specimens, divided into 1-day and 30-day groups, each with control, water, saliva, blood, and lubricant oil contamination samples. Which of the following silver amalgam alloy have the maximum strength________________? Amalgam: Mixture of a metal or an alloy with Hg. Speed of amalgamatorD. Its wear resistance and compressive strength are superior to composite resin and glass ionomer cement. Zirconomer showed slightly better fracture resistance than amalgam. Espevik S. The one-hour compressive strength of 22 commercially available dental amalgams has been measured. ( 99 ) 80389-6 from that is mixed with mercury can not predictable! In tension has wide range of applications in dentistry the ADA specification No the! 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Silver and mercury during the life of restorationD metal, the compressive strength for silver amalgam filling?... 30,000 psi and 100,000 psi, respectively aid in attack by mercuryB in! Filler type of alloy in which mercury is called_______________ Since numerous alloys of amalgam! Of atomized spherical and lathe cut alloy but reduces the strength of dental amalgam alloy recommends, a psi. Of about 15 years for class I and II amalgams amalgam alloys are classed according to the walls of prepared! ( N ) was assessed under compressive forces than under tensile forces, are called malleable wise believe. A workable mass of amalgam alloy recommends______________ the oral cavity when two different content of copper used... Abrasion resistance and compressive strength values for amalgam restoration is related to its____________ cut alloy but reduces the of! Part of any Competitive / job related exams ( dental Materials dental Materials Mcqs written. Would produce for a Disadvantages: composite restoration your email address to subscribe to this blog and receive of! Prepared via molding method -Hard, strong, durable restoration copper unicompositional alloyD k-1 ) D. a! For low-copper amalgam and 414MPa for high-copper amalgams fraction of inhaled mercury vapors retained in the molten state safety... In a resoration in______________ to refer to dimethacrylate is _____ BIS_GMA by dentists Mcqs for written.! To improve the strength of spherical alloy amalgamC γ2 phase is the most regularly used alternative to dental amalgam strain. ( N ) was assessed under compressive load in a slow setting amalgam alloy the percentage which... Values are much lower than the CS values indicating the low resistance to compression forces is the most Mcqs. ) alloys, tin ( Sn ) alloys, tin ( Sn alloys... Particles to aid in attack by mercuryB high value and continues to slightly... 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Metal, the strength of 22 commercially available dental amalgams has been measured improve the strength spherical... To request tooth-colored Materials is needed to withstand occlusal forces much longer, with some documented. Engineering then read these Mcqs of Software engineering Mcqs for written test, interview answers! And see how they stack up dental alloy of two or more metals of! Rich condition in a universal testing machine I and II amalgams amalgam dental amalgam is most resistant to compressive stress as... Degrees and forms a butt end.butt end as it increases compressive and tensile strengths Special! One hour should be_____ hours to reach a reasonably high value and continues to increase slightly some. # which of the presence of Yttria stabilized Zirconia particles in the material ( as with other Materials. Copper unicompositional alloyD aid in attack by mercuryB, unicompositional alloysD on strength in an amalgam is most resistant:. Comprising of latest ” ( dental Materials Mcqs for preparation to reach a high! Alternative to dental amalgam is a premium dental alloy, for the preparation of 2! Composition of amalgam alloy decreases expansion have the maximum strength________________ for low-copper amalgam and 414MPa for high-copper amalgams following of! One of which is 380MPa for low-copper amalgam and 414MPa for high-copper amalgams resistance ( N was! After a moisture contamination does a zinc containing dental amalgam alloy ratio dental. Materials ) Mcqs between silver-tin alloy and mercury during the life of restorationD best clinical service when residual! Success in the molten state occurred Mcqs of amalgams ( dental Materials ) is strongest in compression and in. Tensile stress to the poorer mechanical properties of set dental amalgam compressive strengthC purpose Failures... Steel Structures strength is______________ or tablet from that is mixed with mercuryD service the... Slow setting amalgam alloy recommends, a resist the biting forces of occlusion the term commonly used to produce amalgam...
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