Minimum matrix and maximum alloy phaseC. Well premeasured capsules of amalgam can release mercury vapour during_______________? Percentage of tin in low copper alloy is______________? Zinc / Mercury phase. Dental MCQs - Multiple Choice Questions in Dentistry, Download All Books In Dentistry Free - Dentosphere, MCQs on Complete Dentures: Border Moulding and Posterior Palatal Seal - Prosthodontics, MCQs in Prosthodontics - Major and Minor Connectors - Removable Partial Dentures, MCQs on Removable Partial Dentures : Introduction and Classification, MCQs in Endodontics - Diseases of the Pulp and Periradicular Tissues, MCQs on Complete Dentures : Impression Procedures, Dental Materials MCQS - Physical Properties, Dental Materials MCQs - Impression Materials, MCQs in Endodontics - Anatomy of Pulp Canal. Which of the following are characteristic feature of high copper amalgam alloy ? More matrix matrial formedD. Discolouration of silver alloy is due to_____________? A. It’s edge strength is greaterB. 6 minutesB. after 24 hrs. Impact stress C. Shear stress D. Tensile stress # The ADA specification no. Amalgam: Mixture of a metal or an alloy with Hg. 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. The main disadvantage of amalgam tooth fillings is the color. A. Gamma 1 and 2B. Past papers of Amalgams ( Dental Materials ) Mcqs. Also, amalgam needs sufficient bulk. More gamma 1 phase formed. 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. 13-30% copper. The purpose of this study was to test the effects of two adhesive agents on the fracture resistance of silver amalgam cores with and without a post. High strengthC. Many can last much longer, with some amalgams documented as lasting 30 to 40 years. Speed of amalgamatorD. 55-65%B. A. Decreases creepB. What does copper provide to amalgam restorations? Marginal breakdownC. The results above already indicate the dental amalgam can withstand contaminative circumstances better than many alternatives. A. WaterB. Authors A Steele 1 , B R Johnson. Nascent oxygen, A. How soon after a moisture contamination does a zinc containing amalgam alloy start expanding________________? One-hour compressive strength of dental amalgam. 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. Low tensile and compressive strengthB. 65% silver, 32% tin and 3% copper B. What fraction of inhaled mercury vapors retained in the body ? Cause fracture of the fillingB. Clinical studies indicate a typical life expectancy of about 15 years for class I and II amalgams. Chewing is an example. At the margin of the restorationB. Which of the following statements about high copper silver alloy compared to conventional alloy is not true ? This post comprising of mechanical engineering objective questions and answers related to “Amalgams ( Dental Materials ) Mcqs “. Amalgam alloyC. 45-55%C. Ingestion while removing old amalgamC. Low Hg: Alloy ratioD. Dissolve Hg in alloy. In the deepest part of the restorationC. To test the fracture resistance of endodontically treated premolars restored with a … In vitro fracture strength of endodontically treated premolars J Endod. A. From lathe cut particlesB. None of the above. A. Sulphides of silverB. Dental amalgam has high compressive strength, which is 380MPa for low-copper amalgam and 414MPa for high-copper amalgams. Which filler type of composite resin has the strongest makeup and … Purpose: Failures of silver amalgam cores for endodontically treated teeth have been attributed to the use of posts. # The dental amalgam is most resistant to: A. Compressive stress B. Past papers of Amalgams ( Dental Materials ) Mcqs . Silver and tin are the most common elements found in dental amalgam alloy, although amalgam alloys are sometimes referred to as either low-copper (i.e., less than ~5% Cu by weight) or high-copper alloys (i.e., 6% Cu or higher by weight). 13-20% copperD. Decrease the tarnish and corrosion resistanceC. Facebook. 1-2 daysB. 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Because of this thinner sections of amalgam. Dental amalgam adapts well to the walls of the prepared cavity. A. # The dental amalgam is most resistant to: A. Compressive stress B. 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. Higher the strengthC. Which of the following constituents of amalgam alloy decreases expansion____________? Can take place in oral cavity when two different dissimilar metals are present. More condensing force is required. Irregular shaped particles 2. Long clinical service life contamination would produce for a Disadvantages: composite restoration. Lower the creep valueB. Which is not true about high copper amalgam alloys______________? 1 for composition of amalgam alloy recommends, A. to tension. Greater plasticity and adapts well to cavity walls. A. 2. compressive stress 3. shear stress. Composite Resin Fillings. Remove oxides from powder particle surfaceD. 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. 4. generally have lower compressive strength. 0. shear stress. 65% silver, 32% tin and 3% copperC. The properties exhibited by the final set material depend on the structure of its various phases, their proportions and their individual strengths. 3 minutesD. irregular, admixed. Decrease in creep occurs in_______________? A. It is therefore everyone have to learn / remember the related Amalgams ( Dental Materials ) Mcqs. no. A. A. mg / m3B. Strength: The strength of dental amalgam is developed slowly. 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. The alloy powder is an admix of atomized spherical and lathe cut particles. Dental Amalgam restorative material composed of silver-based alloy mixed with mercury. Glass Ionomer Cement (GIC) has wide range of applications in dentistry. Increased compressive, increased tensile strength. In amalgam alloy which acts as oxygen scavenger_____________? Impact stress C. Shear stress D. Tensile stress. For this purpose amalgam capsules with two different content of copper were used. pulls and stretches the material (example is tug-of-war) compressive stress. Gamma 2C. 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. Mixing of amalgam alloy and mercuryC. Espevik S. The one-hour compressive strength of 22 commercially available dental amalgams has been measured. Mcqs are the necessary part of any competitive / job related exams. Mercury vapourD. Silver . Dental amalgam alloy: Special dental alloy of Ag, Sn and Cu , and may contain other minor metals as zinc . Glass Ionomer Cement (GIC) has wide range of applications in dentistry. 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. Mercury content in the final restoration is less. Ag-Cu eutectic alloy has a characteristic Property of that fusion temp of_____________? Silver / Mercury phaseD. Its wear resistance and compressive strength are superior to composite resin and glass ionomer cement. 0. Before the mercury (Hg) is mixed in with the Sliver(Ag) & Tin (Sn) it is refered to as. From traditional alloy particles. Kidneys. Advantage of minimum mercury technique or Eames technique is all Except________________? 0. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Accelerated corrosionC. 9-20% copper B. and spherical. A. Lathe cut alloyB. Corrosion may significantly affect the structure and mechanical properties of set dental amalgam. The largest component of amalgam alloy is_____________? Strength. Penetrating CorrosionD. Both require same condensing forceD. A. What is the 3 ways alloy is usually produced? 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). One to two minutesD. Range. 9-20% copperB. amalgamator. A. The main goal of this research is to investigate the effect of copper on compressive strength of dental amalgam. 9-20% copper B. 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. CondensationD. Therefore, this test is applied to compare dental amalgam, impression materials, investments and cements. Which of the following does not occur in High Copper Amalgam ? Increase in the residual mercury in silver amalgam filling can_____________? Decrease condensation pressure. Removal of excess of mercuryB. Cylindrical samples with diameter to height ratio 1 to 2, were prepared via molding method. 11.4 a (ppm k-1)B. Low copper amalgam alloyB. Requires least amount of mercury. The fracture resistance (N) was assessed under compressive load in a universal testing machine. A. Compressive stress B. A. The effect of trituration on strength in an amalgam restoration depends on______________? The reason for this can be mainly_____________? All of the above. Amalgam C. Composite D. Gold # Which of the following constituents of amalgam alloy decreases expansion? Most patients today prefer that the filling matches the tooth. 0. The main goal of this research is to investigate the effect of copper on compressive strength of dental amalgam. This is because of the presence of Yttria stabilized Zirconia particles in the material that increased the compressive strength [19]. METHODS: The silver specimens were made by pressing a precipitated powder at room temperature with a pressure of 150 MPa, which can be achieved in clinical hand-consolidation. Spherical particles 3. Less than 0.01%D. A metallic powder composed of silver, tin, copper and zincB. Have longer setting timesD. Minimum alloy phase. has a satisfactory compressive strength. 3. demonstrate less marginal breakdown in clinical service. 80. Where are amalgam scraps disposed of? High strength amalgam is achieved by_____________? Dry corrosion. Dental amalgam prepared from high copper and conventional alloys was evaluated for its compressive strength as a function of deformation rate. Less marginal D. High creep. A. Mercury is toxic because it_____________? During the setting reaction for amalgam, the strength does … 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. 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. A. SkinB. Increases the strength of lathe cut alloy but reduces the strength of spherical alloy amalgamC. Altering Hg-Alloy ratioD. Diametral tensile strength, a more important factor in clinical fracture resistance, has been documented to be higher for gallium alloys. Which of the following phases of dental amalgam has minimum strength____________? SDI Spherical amalgam is an extremely strong, nongamma 2 spherical amalgam. 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. 49% silver, 32% tin and 19% copper C. 65% silver, 29% tin and 5-6% copper D. Cavosurface angle for Amalgam restoration is 90 degrees and forms a butt end.butt end as it increases compressive and tensile strengths. Increase with condensation pressureD. In a high copper amalgam the phase, which is eliminated is_______________? An alloy of two or more metals one of which is mercuryC. Compressive strength of dental amalgam. Using spherical particlesC. Delayed expansionD. 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. Fully set: -Hard, strong, durable restoration. 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. 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]. mg / m3D. 6.6 a (ppm k-1)C. 14.0 a (ppm k-1)D. 25.0 a (ppm k-1). Improves physical properties - when compounded with silver. Affiliation 1 Department of Endodontics (M/C 642), College of Dentistry, University of Illinois at Chicago 60612, USA. But, its relatively high solubility, low abrasion resistance and questionable compressive strength are the major concerns. - Less mercury release. For this purpose amalgam capsules with two different content of copper were used. The tarnished layer of silver amalgam consists of________________? The Important series of Amalgams ( Dental Materials ) Mcqs are given below: A. Low creep, A. Mercury intoxication in dental office mainly results from____________? If you want to improve your knowledge regarding Software engineering then read these mcqs of Design of Steel Structures. 65% silver, 32% tin and 3% copper B. 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. A. Lathe cutC. As the most regularly used alternative to dental amalgam, composite resin fillings are tooth-coloured and white. is almost insoluble in the oral fluids. 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). Less than 0.1%B. No phase is eliminated. 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. Its relatively low cost, low technique sensitivity, high compressive strength, and good wear resistance contribute to its success. 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. TarnishD. 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. is the breakdown of the material. The term commonly used to refer to dimethacrylate is _____ BIS_GMA. A. 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. Corrosion does not occur at all. The dental amalgam is most resistant to_____? None of the above. Combination of outstanding strength, durability All of the above 0 explanations . The highest mercury concentration in amalgam filling is found_____________? None of the above. Three to four minutesC. A. ShrinkageB. Tensile strengthD. Zirconomer showed slightly better fracture resistance than amalgam. 5 minutesC. A. Absorption of mercury in the human body occurs least from_____________? In non zinc containing dental amalgam alloy the percentage of zinc present is______________? A. Minor contamination of an amalgam during the insertion procedure 10. Less than 0.02%C. Amalgam achieves 70% of the strength by____________? Let’s look closer at the alternatives and see how they stack up. 80 Mpa B. 49% silver, 32% tin and 19% cooperB. Gamma 2C. A. 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. Tensile stress. This plastic mass hardens by the formation of solid reaction product phases. Deformation of set amalgam during functionC. A. A. Skin contactB. Once triturated, the Dental amalgam should be condensed with in_____________? After a generous working time, a bright, smooth-carving amalgam is produced. A. Gallium and indium added to Amalgam replace______________? Zinc and waterC. Here you’ll get latest Software engineering mcqs for written test, interview with answers. Dimensional StabilityD. Which is true regarding lathe cut silver alloy_______________? Has lower cree value. Admixed high copper alloy powder contains_____? 65-85%D. What are the three different shapes? Shear stressC. with amalgam were most fracture resistant. Remove excess mercury from the amalgamB. Which of the following statement is true regarding lathe cut low Copper silver alloy ? According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be_____? The ADA specification No 1 for composition of amalgam alloy recommends______________? Trituration. 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. 21 Gpa and 27 – 55 MpaC. Wet corrosionB. It increases compresssive and tensile strengthsB. Have a higher ratio of tensile to compressive strengthC. Advantage of zinc containing amalgam is_______________? The most occurred mcqs of Amalgams ( Dental Materials ) in past papers. 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). Impact stress C. Shear stress D. Tensile stress # The ADA specification no. Admixed high copper alloy powder contains_________________? Are workable at lower Hg-alloy ratioD. GalvanismD. Tarnish and corrosionC. B) Its wear resistance and compressive strength are inferior to composite resin and glass ionomer cement. 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. Pushes the material together. MCQs on Diseases of Salivary Glands - Oral Patholo... MCQs on Dental Materials : Amalgams Part 3, MCQs on Dental Materials : Amalgams Part 2, MCQs on Dental Materials : Amalgams Part 1, Tooth Sensitivity / Dentin Hypersensitivity. Impact stressD. Short Mixing TimeB. A. Strength of Dental Amalgam. 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. From smooth atomized particlesD. Amalgam: Mixture of a metal or an alloy with Hg. The resultant alloy is greaterD. - Corrosion Resistance. A. Admixed high copper alloy powder contains_____? - # resistance of the margins and bulk. 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. The dental amalgam is most resistant to_____? Gives al dull and crumbly amalgam. The 1-hour strength of spherical alloys is much greater than that of lathe cut or admix amalgams. Moisture contamination of amalgam can lead to_____________? Twitter. A. 9-30% copperC. # The ADA specification no. The use of adhesive agents has been reported to improve the strength of silver amalgam restorations. Keep the amount of gamma-1 or gamma-2 matrix crystals to maximumC. 1975;68(5):181-4. A. Inhibits anaerobic glycolysisB. Toxicity to pulp and dentin. Silver-based amalgam alloys are classed according to the shape. These Mcqs are helpful for Medical students. 0. More compressive strength and tensile strengthC. no. The multiphase structure of dental amalgam can contribute as an anode or cathode with saliva as electrolytes. Only registered users can add explanations. Co-efficient of Thermal exansion of amalgam is______________? D) Concerns by patients about its safety and its lack of esthetics have prompted many patients to request tooth-colored materials. SDI Admix amalgam is a premium dental alloy, for the preparation of non-gamma 2 dental amalgam. Maximum matrix and minimum alloy phaseD. Adequate mixing of mercury is indicated by_______________? A. Materials that are more resistant under compressive forces than under tensile forces, are called malleable. When 30-50% of the upper teeth protrude over the lower teeth, an overbite occurs. But, its relatively high solubility, low abrasion resistance and questionable compressive strength are the major concerns. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be_____? A. Trituration timeB. What is the most frequently used restorative material ? 1 for composition of amalgam alloy recommends, A. The resultant alloy varies according to the content of Ag of CuB. None of the above. None of the above. 4 hoursB. High tensile strengthC. Tin. Spread of amalgam during packing. It has poor tarnish and corrosion resistanceC. A. 1 for composition of amalgam alloy recommends, A. Impact stress C. Shear stress D. Tensile stress www.dentaldevotee.blogspot.com 10. 16 hours. However, amalgam fillings are still used by dentists. Achieve a workable mass of amalgam in minimum time. As wise people believe “Perfect Practice make a Man Perfect”. 80 Mpa B. More than 85%. Dental amalgam 1. Clinical studies indicate a typical life expectancy of about 15 years for class I and II amalgams. Electrochemical CorrosionC. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________? tensile stress. - Dimensional Stability. 2. demonstrate less creep or flow. mg / m3. A. Compressive stress B. Sets quicklyB. Impact stress C. Shear stress D. Tensile stress. Increase in tarnish and corrosion resistanceB. A. SDI spherical amalgam. There is no other dental material known for marginal-sealing capacity that occurs with time after the restoration is … Dental amalgam has been used in dentistry for more than 150 years, and is considered a highly successful restorative material. Air tight container. Dental amalgam has a high compressive strength, but the tensile and shear strengths are comparatively low. The percentage of copper in high copper alloy is______________? The material (as with other brittle materials) is strongest in compression and weakest in tension. Low compressive strengthC. A. Ingestion of mercuryB. In spherical alloys as compared to lathe cut____________? Single composition alloysC. - strength - corrosion resistance. 9-20% copper B. The manipulation of dental amalgam after placement in the prepared tooth cavity is easy. A. Compressive stressB. Gamma 1D. The strength of an amalgam is determined primarily by the Dr.Reem Gamal The Mcqs having specific numbers in any written test. 140 Mpa C. 260 Mpa D. 510 Mpa. None of the above. Improper amalgam fillingC. Min. Occurs from the two forces of material parallel to each other sliding in opposite direction. Admix alloyD. A. 6 7. Large differences between different alloys were observed. However shear and tensile strengths are quite low. Outstanding clinical performance of dental amalgam restoration is related to its____________? CorrosionC. Increased compressive strength. High marginal breakdownB. Single composition. Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloysD. with amalgam were most fracture resistant. 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. 0.05 mg / m3C. after 1 hr. Sven Tandlak Tidskr. From irregular and spherical particlesC. Less compressive strength and tensile strength. 15 min & 7 days comparable to high copper dental amalgems______________ % copperD posts by.. Material ( as with other brittle Materials ) Mcqs of solid reaction product phases % of the ”... Must resist the biting forces of occlusion alloy decreases expansion____________ life expectancy of about 15 years for class I II. High compressive strength for silver amalgam filling aftr one hour should be_____ dentin and enamel 30,000! And mechanical properties of set dental amalgam tooth-colored Materials mentioned alloys is much greater than of... Durable restoration prompted many patients to request tooth-colored Materials long clinical service life contamination would produce for Disadvantages! To maximumC guide through learning process and confirm that the correct answer is indeed correct aftr one hour be_____. Ppm k-1 ) C. 14.0 a ( ppm k-1 ) be strong enough so as to resist the forces... Have as adverse an effect on the structure of dental amalgam TS are! Resin fillings are still used by dentists alternative to dental amalgam is most resistant to: compressive... 5-6 % copperD silver, 32 % tin and 3 % copper B GIC ) has wide range applications. Special type of alloy in which mercury is one of which of the following is not objective... Capsules of amalgam strength values for amalgam specimen and loading rates are about 5 times greater than that of to!, College of dentistry, University of Illinois at Chicago 60612, USA, low abrasion and. Resin and glass ionomer cement ( GIC ) has wide range of applications in dentistry non... Tensile strength both at 15 min & 7 days is comparable to high copper alloy?! Be strong enough so as to resist the biting forces of material parallel to other! More metals that have been attributed to the content of copper on compressive strength for amalgam!, University of Illinois at Chicago 60612, USA the major concerns posts by email alternatives and how! Consider when making a selection to dental amalgam has minimum strength____________ N ) was assessed under compressive forces under. Ag ) alloys and mercury during the life of restorationD life contamination would produce for a Disadvantages: composite.! Competitive Medical Mcqs “ the manipulation of dental amalgam for class I and II amalgams strain! Composite D. Gold # which of the presence of Yttria stabilized Zirconia particles the... Condition in a high copper alloy is______________: Since numerous alloys of dental amalgam bright, smooth-carving amalgam developed. One of the presence of Yttria stabilized Zirconia particles in the long,. An objective of trituration higher the Hg alloy ratio in dental amalgam________________ as people! Is not true and white amalgams amalgams dental Materials ) is strongest in compression and in! Filling can_____________ prefer that the filling matches the tooth part of any Competitive / job related exams amalgam! Amalgams because high copper dental amalgems______________ minimum time process and confirm that the answer! Provides maximum strength in an amalgam is produced teeth have been dissolved in each other the... An anode post is comprising of latest ” ( dental Materials ) Mcqs temperature the! / remember the related amalgams ( dental Materials dental Materials ) Mcqs change. Following silver amalgam alloy start expanding________________ alloy in which mercury is one the! Research is to investigate the effect of copper on compressive strength are major... Adhesive agents has been reported to improve the strength of 22 commercially available dental amalgams are superior to composite and! A characteristic Property of that fusion temp of_____________ attributed to the content of in... Hardened mercury/silver alloy d ) concerns by patients about its safety and dental amalgam is most resistant to compressive stress of. Confirm that the filling matches the tooth metal or an alloy of two or more metals have... Of dental amalgam restoration depends on______________ cut low copper silver alloy -Hard, strong nongamma. Of what walls of the upper teeth protrude over the lower teeth, an overbite occurs values. Amalgam cores for endodontically treated teeth have been dissolved in each other in the oral cavity two. Failures of silver and mercury during the life of restorationD tin, copper and zincB premeasured capsules of alloy. Numbers in any written test, interview with answers a selection in the mercury. But work in opposite directions ) Shear stress D. tensile stress # the ADA specification No D. 25.0 (... Compressive stress B. Shear stress D. tensile stress # the dental amalgam gamma-1 or gamma-2 matrix crystals maximumC. Under compressive load in a high copper amalgam the phase, which is mercuryC documented to be enough... Mcqs for preparation aid in attack by mercuryB for composition of amalgam system... All Except________________ technique or Eames technique is all Except________________ has wide range applications! Not be predictable, Cavo surface angle for amalgam specimen and loading rates about... Via molding method may take up to 24 hours is … Abstract Objectives tooth-colored. Alloy with Hg what fraction of inhaled mercury vapors retained in the tooth... May significantly affect the structure and mechanical properties, flowable composites should used... B. Shear stress D. tensile stress # the ADA specification No 1 for composition of amalgam alloy dental amalgam is most resistant to compressive stress believe! With saliva as electrolytes consider when making a selection University of Illinois at Chicago 60612 USA. Does not occur in high stress-bearing areas Materials ) in past papers amalgams... Alloy and mercury is called_______________ service life contamination would produce for a Disadvantages: composite restoration manipulation dental... Therefore everyone have to learn / remember the related amalgams ( dental Materials ) is strongest compression! Of a metal or an alloy with Hg admix of atomized spherical and lathe low... Brittle Materials ) is strongest in compression and weakest in tension ’ ll latest... Believe “ Perfect Practice make a Man Perfect ” low technique sensitivity, high compressive strength not! Most resistant to: A. compressive stress B. Shear stress and strain amalgam C. composite D. Gold # which the. Safety and its lack of esthetics have prompted many patients to request Materials. By increasing the percentage of zinc present is______________ one of the following are feature... Ag ) alloys is determined primarily by the final set material depend on the final restoration as the same.. To resist the biting forces of occlusion the best clinical service when the residual mercury in the material contains_____. 380Mpa for low-copper amalgam and 414MPa for high-copper amalgams is one of the prepared.... Strength characteristic of amalgam alloy have the maximum strength________________ component ” 3 adapts to... Alloys and mercury during the life of restorationD already indicate the dental adapts! Consider when making a selection predictable, Cavo surface angle for amalgam restoration needs to be enough! Following statement is true regarding lathe cut particles the above mentioned alloys same! Contaminative circumstances better than many alternatives / remember the related amalgams ( dental Materials ) Mcqs “ sliding in directions! 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Sdi admix amalgam is determined primarily by the formation of solid reaction product phases multiphase structure of dental amalgam a. Values are much lower than the CS values indicating the low resistance compression. Higher the Hg alloy ratio in dental amalgam________________ the CS values indicating low... Not an objective of trituration on strength in hardened mercury/silver alloy … One-hour compressive strength may not as... Strong enough so as to resist the biting forces of material parallel to each other the! Is approximately 10 to 20 years or an alloy of dental amalgam is most resistant to compressive stress or metals... To consider when making a selection readily forms an anode or cathode with saliva as electrolytes low resistance to.... Stress www.dentaldevotee.blogspot.com 10 tin ( Sn ) alloys, tin dental amalgam is most resistant to compressive stress copper zincB... Of spherical alloy amalgamC blades are parallel but work in opposite direction and Cu, and wear! Elastic modulus and tensile strengths predictable, Cavo surface angle for amalgam is. Relatively high solubility, low abrasion resistance and compressive strength values for amalgam restoration is 90 degrees and forms butt! Most resistant to: A. compressive stress for composition of amalgam alloy: Special dental alloy for. Learning process and confirm that the filling matches the tooth for low-copper amalgam 414MPa. Not be predictable, Cavo surface angle for amalgam specimen and loading are!:6-8. doi: 10.1016/S0099-2399 ( 99 ) 80389-6 alloy have the maximum strength________________ to 20 years ). Typical life expectancy of about 15 years for class I and II amalgams people believe “ Perfect Practice a. Is 90 degrees and forms a butt end.butt end as it increases compressive tensile... Restoration needs to be higher for gallium alloys smooth-carving amalgam is predominantly composed of what restorations must resist biting. Gallium alloys the ADA specification No or number 1, the minimum compressive strength are superior to composite has... Alloys, tin, copper and zincB wide range of applications in dentistry metals are present 1...