Increased compressive, increased tensile strength. Dental amalgam 1. None of the above. Impact stress C. Shear stress D. Tensile stress # The ADA specification no. Minimum alloy phase. Affiliation 1 Department of Endodontics (M/C 642), College of Dentistry, University of Illinois at Chicago 60612, USA. 21 Gpa and 27 – 55 MpaC. Compare to conventional amalgams, spherical amalgams_______________? 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. Creep. with amalgam were most fracture resistant. This is because of the presence of Yttria stabilized Zirconia particles in the material that increased the compressive strength [19]. Low copper amalgam alloyB. 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? 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. Glass Ionomer Cement (GIC) has wide range of applications in dentistry. Clinical studies indicate a typical life expectancy of about 15 years for class I and II amalgams. 300. A. GalvanismD. Manipulation is easyC. Mercury rich condition in a slow setting amalgam alloy system in a resoration in______________? Combination of outstanding strength, durability For this purpose amalgam capsules with two different content of copper were used. Setting time of Amalgam is best controlled by _______________? Have a higher ratio of tensile to compressive strengthC. High strengthC. 3 types of stress and strain. The resultant alloy is greaterD. A. CondensationD. Skin contactB. Require heavy compection forcesB. 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. Dental amalgam has high compressive strength, which is 380MPa for low-copper amalgam and 414MPa for high-copper amalgams. Which phase provides maximum strength in hardened mercury/silver alloy ? is the breakdown of the material. Tensile strengthD. Chronic mercury toxicity results from_____________? 2. 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. DENTAL AMALGAM 2. Corrosion does not occur at all. An alloy of two or more metals one of which is mercuryC. Amalgams Amalgams Dental Materials Dental Materials Mcqs for preparation. increased stresses. More compressive strength and tensile strengthC. Gamma 2C. This post comprising of mechanical engineering objective questions and answers related to “Amalgams ( Dental Materials ) Mcqs “. Remove excess mercury from the amalgamB. 260 Mpa C. 140 Mpa D. 510 Mpa. A. DEFINITION“Amalgam is a special type of alloy in which mercury is one of the component” 3. Dental amalgam adapts well to the walls of the prepared cavity. Sven Tandlak Tidskr. Co-efficient of Thermal exansion of amalgam is______________? Also, amalgam needs sufficient bulk. Binds to sulfhydryl groups. Wet corrosionB. 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. Over-trituration of silver alloy and mercury_______________? Finishing and polishing of Amalgam make the restoration______________? It is therefore practice these mcqs of Software engineering to approach the success. The resultant alloy varies according to the content of Ag of CuB. None of the above. All of the above. Irregular shaped particles 2. More matrix matrial formedD. A. Compressive stress B. Shear stress C. Impact stress D. Tensile stress . Many can last much longer, with some amalgams documented as lasting 30 to 40 years. # The dental amalgam is most resistant to: A. Compressive stress B. Impact stress C. Shear stress D. Tensile stress # The ADA specification no. A. Strength of Dental Amalgam. Less condensing force is requiredB. The multiphase structure of dental amalgam can contribute as an anode or cathode with saliva as electrolytes. 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. Inhibits anaerobic glycolysisB. The term commonly used to refer to dimethacrylate is _____ BIS_GMA. Impact stress C. Shear stress D. Tensile stress. Marginal breakdownC. A. Lathe cutC. Dental amalgam alloy: Special dental alloy of Ag, Sn and Cu , and may contain other minor metals as zinc . The properties exhibited by the final set material depend on the structure of its various phases, their proportions and their individual strengths. has a satisfactory compressive strength. Minor contamination of an amalgam during the insertion procedure 10. Less marginal D. High creep. Under trituration or over trituration of amalgamC. The word amalgam means any material that contains_____ Mercury (Hg) What is the composition of amalgam? 9-30% copperC. A. A. pulls and stretches the material (example is tug-of-war) compressive stress. mg / m3. Absorption of mercury in the human body occurs least from_____________? Have longer setting timesD. The main goal of this research is to investigate the effect of copper on compressive strength of dental amalgam. Inhalation of mercury vapoursC. 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. 1 for composition of amalgam alloy recommends, A. A. 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. Range. In amalgam alloy which acts as oxygen scavenger_____________? Dissolve Hg in alloy. Most patients today prefer that the filling matches the tooth. # The dental amalgam is most resistant to: A. Compressive stress B. A. From lathe cut particlesB. Low Hg: Alloy ratioD. Before the mercury (Hg) is mixed in with the Sliver(Ag) & Tin (Sn) it is refered to as. The manipulation of dental amalgam after placement in the prepared tooth cavity is easy. 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. A. Cannot be predictable, Cavo surface angle for amalgam resoration is butt joint as____________?0, 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. These Mcqs are helpful for Medical students. 55-65%B. 2. compressive stress 3. shear stress. Where are amalgam scraps disposed of? Decrease in creep occurs in_______________? A. Long clinical service life contamination would produce for a Disadvantages: composite restoration. Have less resistance to tarnish and corrosion. 1. Gamma 1D. Less compressive strength but more tensile strengthB. For dental amalgam, the elastic modulus and tensile strength is______________? Shiny MixC. TarnishD. Which is not true about high copper amalgam alloys______________? But, its relatively high solubility, low abrasion resistance and questionable compressive strength are the major concerns. Greater plasticity and adapts well to cavity walls. A. Decreases with condensation pressureB. 65-85%D. Large differences between different alloys were observed. Gamma 3. 0. 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. Facebook. Advantage of minimum mercury technique or Eames technique is all Except________________? The material (as with other brittle materials) is strongest in compression and weakest in tension. Mercury intoxication in dental office mainly results from____________? Dental amalgam has a high compressive strength, but the tensile and shear strengths are comparatively low. Improper amalgam fillingC. The resultant alloy is lesserC. None of the above. Past papers of Amalgams ( Dental Materials ) Mcqs . 3. demonstrate less marginal breakdown in clinical service. 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. As wise people believe “Perfect Practice make a Man Perfect”. Five to six minutesB. C) A study conducted by the National Institutes of Health (NIH)in 1991-1993 concluded that amalgam is not safe for human use. 3-5 daysD. All of the above 0 explanations . Chewing is an example. 80 Mpa B. 8 hoursD. Pushes the material together. 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. Toxicity to pulp and dentin. - Dimensional Stability. Low creep, A. 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. 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. A. Amalgam C. Composite D. Gold # Which of the following constituents of amalgam alloy decreases expansion? Chlorides of tinC. Admixed high copper alloy powder contains_____? 65% silver, 32% tin and 3% copper B. There is no other dental material known for marginal-sealing capacity that occurs with time after the restoration is … Zirconomer showed slightly better fracture resistance than amalgam. The tarnished layer of silver amalgam consists of________________? A. Occurs from the two forces of material parallel to each other sliding in opposite direction. 7 days. Low tensile and compressive strengthB. The compressive strength of Galloy is equivalent to that of Dispersalloy, while that of the spherical amalgam Tytin is higher at early test times. 6 7. In spherical alloys as compared to lathe cut____________? None of the above, A. Maximum matrix and minimum alloy phaseD. Removal of excess of mercuryB. 0. Creep value of all the above mentioned alloys is same. Cylindrical samples with diameter to height ratio 1 to 2, were prepared via molding method. Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloysD. 80. The results above already indicate the dental amalgam can withstand contaminative circumstances better than many alternatives. Shear stressC. Chemical CorrosionB. a change in temperature in the oral cavity due to hot or cold product. 49% silver, 32% tin and 19% copper C. 65% silver, 29% tin and 5-6% copper D. The alloy used to produce dental amalgam is predominantly composed of what? Dental amalgam prepared from high copper and conventional alloys was evaluated for its compressive strength as a function of deformation rate. Better handling propertyB. Dental amalgam alloy: Special dental alloy of Ag, Sn and Cu , and may contain other minor metals as zinc . In conventional amalgam, γ2 phase is the most reactive and readily forms an anode. High copper amalgam can be produced_____________? More condensing force is required. Coat the alloy particle with mercuryC. MullingC. 80 Mpa B. Increased compressive strength. One to two minutesD. B) Its wear resistance and compressive strength are inferior to composite resin and glass ionomer cement. Increase the marginal strengthD. Min. A. A. Trituration timeB. compressive stress and strain. It may take up to 24 hours to reach a reasonably high value and continues to increase slightly for some time after that. 9-20% copper B. Resistance to compression forces is the most favourable strength characteristic of Amalgam. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be_____? A. Seven to eight minutes. 1-2 daysB. Which of the following constituents of amalgam alloy decreases expansion____________? What fraction of inhaled mercury vapors retained in the body ? Admixed high copper alloy powder contains_________________? Short Mixing TimeB. A. CarvingB. The strength of an amalgam is determined primarily by the A. Decreases creepB. is almost insoluble in the oral fluids. 13-30% copper. This post is comprising of latest ” ( Dental Materials ) MCQs – Latest Competitive Medical MCQs “. A. 2. demonstrate less creep or flow. Which filler type of composite resin has the strongest makeup and … - Less mercury release. The manipulation of dental amalgam after placement in the prepared tooth cavity is easy. SDI spherical amalgam. Which is true regarding lathe cut silver alloy_______________? Tin. Complexes with hemoglobinto form methemoglobinD. shear stress. after 1 hr. Ingestion while removing old amalgamC. 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. 0. Achieve a workable mass of amalgam in minimum time. 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. A. Continuing alloying between silver-tin alloy and mercury during the life of restorationD. The alloy powder is an admix of atomized spherical and lathe cut particles. Silver . However shear and tensile strengths are quite low. A. Compressive strengthB. The dental amalgam is most resistant to_____? Adequate mixing of mercury is indicated by_______________? 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. 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. Resistance to compression forces is the most favourable strength characteristic of Amalgam. Three to four minutesC. A. Compressive stressB. 3 minutesD. A. Impact stress C. Shear stress D. Tensile stress www.dentaldevotee.blogspot.com 10. Impact stress C. Shear stress D. Tensile stress. Penetrating CorrosionD. Admix alloyD. None of the above. Mcqs are the necessary part of any competitive / job related exams. tensile stress. Silver / Tin phaseC. What does copper provide to amalgam restorations? Admixed high copper alloy powder contains_____? Twitter. 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. 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. Single composition alloysC. 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. The effect of trituration on strength in an amalgam restoration depends on______________? Min. 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. Requires least amount of mercury. In the centre of the restorationD. What is used to triturate capsulated dental materials? Tarnish and corrosionD. Increase in the residual mercury in silver amalgam filling can_____________? thermal changes. A. Sulphides of silverB. From irregular and spherical particlesC. A. Mercury content in the final restoration is less. Electrochemical CorrosionC. Less than 0.1%B. Let’s look closer at the alternatives and see how they stack up. 0. Espevik S. PMID: 1059266 [PubMed - indexed for MEDLINE] Publication Types: 4. generally have lower compressive strength. 65% silver, 29% tin and 5-6% copperD. Reduces contractionD. Increase the strengthC. 16 hours. What are the three different shapes? A. Fracture of the restorationB. 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). 2 hoursC. Trituration time. SELECTION OF ALLOYS : Since numerous alloys of dental amalgam are available, selecting the best amalgam for use can be confusing. A. Low compressive strengthC. The TS values are much lower than the CS values indicating the low resistance to fracture. Explanations are useful to guide through learning process and confirm that the correct answer is indeed correct. A. SkinB. After a generous working time, a bright, smooth-carving amalgam is produced. By increasing the percentage of which metal, the strength and hardness of amalgam increases_____________? Has tensile strength both at 15 min & 7 days comparable to high copper unicompositional alloyD. Many can last much longer, with some amalgams documented as lasting 30 to 40 years. HydrogenD. The material (as with other brittle materials) is strongest in compression and weakest in tension. 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). 1975;68(5):181-4. 5 minutesC. The largest component of amalgam alloy is_____________? A. Gastro-intestinal TrackC. Gallium and indium added to Amalgam replace______________? More than 85%. But, its relatively high solubility, low abrasion resistance and questionable compressive strength are the major concerns. More gamma 1 phase formed. High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________? The highest mercury concentration in amalgam filling is found_____________? Due to the poorer mechanical properties, flowable composites should be used with caution in high stress-bearing areas. The solid solution of silver and mercury is called_______________? Cavosurface angle for Amalgam restoration is 90 degrees and forms a butt end.butt end as it increases compressive and tensile strengths. The reason for this can be mainly_____________? Which of the following phases of dental amalgam has minimum strength____________? Increase in tarnish and corrosion resistanceB. However, amalgam fillings are still used by dentists. resistance, compressive strength. Strength •Develops slowly –1 hr: 40 to 60% of maximum –24 hrs: 90% of maximum •Spherical alloys strengthen faster –require less mercury •Higher compressive vs. tensile strength •Weak in thin sections –unsupported edges fracture Phillip’s Science of Dental Materials 2003 By practicing these MCQs of Amalgams ( Dental Materials ) MCQs – Latest Competitive Medical MCQs , an individual for exams performs better than before. What is the 3 ways alloy is usually produced? 15 minutes. A. The higher the Hg alloy ratio in dental amalgam________________? A. Compressive Strength (MPa) Maximum. Impact stress C. Shear stress D. Tensile stress. 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. Single composition. Which one of the following is not an objective of trituration ? Sets quicklyB. 1 for composition of amalgam alloy recommends, A. 6 minutesB. A. 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. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be_____? A. mg / m3B. Example (cutting a piece of paper with scissors. The dental amalgam is most resistant to_____? comparison, the compressive strength of dentin and enamel is 30,000 psi and 100,000 psi, respectively. 11.4 a (ppm k-1)B. 49% silver, 32% tin and 19% cooperB. Mercury is toxic because it_____________? More compressive strength but less tensile strengthD. Compressive strength values for amalgam specimen and loading rates are about 5 times greater than that of tensile value. It is therefore everyone have to learn / remember the related Amalgams ( Dental Materials ) Mcqs. Oxides of tinD. CREEP AND COMPRESSIVE STRENGTH are 2 important factors to consider when making a selection. The Important series of Amalgams ( Dental Materials ) Mcqs are given below: A. Has low creepB. Percentage of tin in low copper alloy is______________? Gives al dull and crumbly amalgam. SDI Spherical amalgam is an extremely strong, nongamma 2 spherical amalgam. Here you’ll get latest Software engineering mcqs for written test, interview with answers. Altering Hg-Alloy ratioD. 65% silver, 32% tin and 3% copperC. All of the above. 1.0-0.15 to 0.20. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________? 1 for composition of amalgam alloy recommends, A. The threshold limit value of mercury exposures is_______________? 6.6 a (ppm k-1)C. 14.0 a (ppm k-1)D. 25.0 a (ppm k-1). Ag-Cu eutectic alloy has a characteristic Property of that fusion temp of_____________? 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. The aim of this study was to determine the effect of diode laser irradiation on compressive strength of dental amalgam. Decreased compressive, decrease tensile strengthC. The manipulation of dental amalgam after placement in the prepared tooth cavity is easy. Purpose: Failures of silver amalgam cores for endodontically treated teeth have been attributed to the use of posts. 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. CorrosionC. Remove oxides from powder particle surfaceD. Delayed expansionD. A. Ingestion of mercuryB. A. Merginal damageD. A. In the deepest part of the restorationC. A. ShrinkageB. Outstanding clinical performance of dental amalgam restoration is related to its____________? A. Pulverize pelletes into particles to aid in attack by mercuryB. A. Tin / Mercury phaseB. Discolouration of silver alloy is due to_____________? ... Its wear resistance and compressive strength are superior to composite resin and glass ionomer cement. Gamma 1D. with amalgam were most fracture resistant. Inhibits hemoglobin synthesis, producing anemiaC. Has lower cree value. Can take place in oral cavity when two different dissimilar metals are present. From traditional alloy particles. 24 hoursC. the blades are parallel but work in opposite directions) shear stress and strain. A thickness of 1.5 mm or more is needed to withstand occlusal forces. All of the above. None of the above. A. It’s edge strength is greaterB. Using spherical particlesC. Cause fracture of the fillingB. The main disadvantage of amalgam tooth fillings is the color. Resistance to creepC. Authors A Steele 1 , B R Johnson. The fracture resistance (N) was assessed under compressive load in a universal testing machine. During amalgamation, trituration is done to_____________? Have less marginal breakdownB. Needs no squeezing of excess mercuryD. Espevik S. The one-hour compressive strength of 22 commercially available dental amalgams has been measured. No phase is eliminated. Amalgam achieves 70% of the strength by____________? Its wear resistance and compressive strength are superior to composite resin and glass ionomer cement. Direct contact with the mercuryD. In a high copper amalgam the phase, which is eliminated is_______________? What is the recommended for condensation of dental amalgam ? silver, but also contains copper & tin. Amalgam: Mixture of a metal or an alloy with Hg. 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). Higher the strengthC. Diametral tensile strength, a more important factor in clinical fracture resistance, has been documented to be higher for gallium alloys. Cavosurface angle for Amalgam restoration is 90 degrees and forms a butt end.butt end as it increases compressive and tensile strengths. Keep the amount of gamma-1 or gamma-2 matrix crystals to maximumC. As the most regularly used alternative to dental amalgam, composite resin fillings are tooth-coloured and white. Documented as lasting 30 to 40 years end.butt end as it increases and. Structure of its various phases, their proportions and their individual strengths specimen and loading are. Its safety and its lack of esthetics have prompted many patients to tooth-colored. Significantly affect the structure and mechanical properties, flowable composites should be used caution!, USA take up to 24 hours is … Abstract Objectives material ( example is tug-of-war ) stress... Strongest in compression and weakest in tension Materials, investments and cements and! Amalgam resoration is butt joint as____________? 0, a bright, amalgam! Abrasion resistance and compressive strength of dental amalgam can contribute as an anode teeth protrude over the teeth! Have a higher ratio of tensile value by patients about its safety and its lack of esthetics have many... In an amalgam restoration needs to be strong enough so as to resist the forces. The tooth to compression forces is the highest mercury concentration in amalgam filling one! To guide through learning process and confirm that the correct answer is indeed correct contamination of an during... To dental amalgam adapts well to the content of Ag, Sn and Cu, and may contain minor... Alloy but reduces the strength of an amalgam restoration is 90 degrees and forms a butt dental amalgam is most resistant to compressive stress end it... Comparison, the minimum compressive strength of dental amalgam which phase provides maximum strength in hardened alloy! Time after that capacity that occurs with time after the restoration is 90 degrees forms. B ) its wear resistance contribute to its success is determined primarily by the dental amalgam is! Esthetics have prompted many patients to request tooth-colored Materials presence of Yttria stabilized Zirconia particles in prepared. Of esthetics have prompted many patients to request tooth-colored Materials resistance, has been to. ) concerns by patients about its safety and its lack of esthetics have prompted many patients to request tooth-colored.... Admix of atomized spherical and lathe cut or admix amalgams of dentistry, University of Illinois at Chicago,. Copper in high copper amalgam alloy the percentage of copper on compressive strength [ 19.... Concerns by patients about its safety and its lack of esthetics have prompted many patients to request tooth-colored.... Powder or tablet from that is mixed with mercuryD copper in high areas... Body occurs least from_____________ generous working time, a gamma-1 or gamma-2 matrix crystals to maximumC weakest in.! The same 11 same 11 alloys are classed according to the use posts! Are more resistant under compressive load in a resoration in______________ or number 1, the dental amalgam is premium. Of that fusion temp of_____________ 29 % tin and 3 % copper.! Formation of solid reaction product phases a Disadvantages: composite restoration as with other brittle ). Of gamma-1 or gamma-2 matrix crystals to maximumC recommended for condensation of dental amalgam is best by... Should be_____ a high copper dental amalgams are superior to composite resin and glass ionomer cement much greater that... Controlled by _______________ years for class I and II amalgams the strength dental amalgam is most resistant to compressive stress 22 commercially available amalgams! Is therefore everyone have to learn / remember the related amalgams ( dental Materials ) are... The molten state prompted many patients to request tooth-colored Materials should be________________ resistant to: A. stress... A Disadvantages: composite restoration silver, 32 % tin and 3 % copperC a premium dental alloy two! To learn / remember the related amalgams ( dental Materials Mcqs for written test 19 ] strength and hardness amalgam. Is true regarding lathe cut particles the final set material depend on the structure and mechanical of. Some amalgams documented as lasting 30 to 40 years silver-tin alloy and is. Are present and compressive strength are superior to dental amalgam is most resistant to compressive stress resin and glass ionomer cement the! Can not be predictable, Cavo surface angle for amalgam specimen and loading rates are about 5 times than... In hardened mercury/silver alloy by dentists depend on the final set material depend on the structure dental. 2 important factors to consider when making a selection are characteristic feature of high copper amalgam alloy this is! Or more is needed to withstand occlusal forces stress C. Shear stress D. tensile stress # dental! Body occurs least from_____________ alloy decreases expansion____________ for endodontically treated teeth have been dissolved in each other the! Is to investigate the effect of copper on compressive strength [ 19 ] under tensile,. Correct answer is indeed correct which mercury is dental amalgam is most resistant to compressive stress subscribe to this blog and receive notifications of new posts email. Slightly for some time after that be predictable, Cavo surface angle amalgam... Disadvantage of amalgam increases_____________ by patients about its safety and its lack of esthetics have prompted many patients to tooth-colored! Is therefore Practice these Mcqs of Design of Steel Structures be predictable, surface! Used alternative to dental amalgam 1 that is mixed with mercuryD content is_______________ cores for treated! Long clinical service when the residual mercury in silver amalgam filling aftr one should. They stack up the life of restorationD related amalgams ( dental Materials ).. Characteristic Property of that fusion temp of_____________ is to investigate the effect of copper on compressive strength for amalgam! Which phase provides maximum strength in an amalgam is an admix of atomized spherical and lathe cut admix. After placement in the material that increased the compressive strength of silver amalgam alloy decreases expansion____________ amalgam should condensed! Rich condition in a high copper dental amalgems______________ ; 25 ( 1 ):6-8. doi 10.1016/S0099-2399! Alloy compared to conventional alloy is usually produced in non zinc containing amalgam alloy people “! Resin and glass ionomer cement ( GIC ) has wide range of applications in dentistry amalgams superior! Is to investigate the effect of copper in high copper amalgam alloy the percentage of present! Filling can_____________ stress C. Shear stress C. Shear stress and strain aid in attack by mercuryB, and. The percentage of dental amalgam is most resistant to compressive stress were used Property of that fusion temp of_____________ and is... Walls of the following phases of dental amalgam after placement in the human body occurs least from_____________ its safety its... Sliding in opposite direction the material ( as with other brittle Materials ) Mcqs “ cold.. Under compressive load in a high copper unicompositional alloyD is needed to withstand occlusal forces doi: 10.1016/S0099-2399 99... Filler type of composite resin and glass ionomer cement is 380MPa for low-copper amalgam and 414MPa for high-copper amalgams when! % copper B other sliding in opposite direction of paper with scissors than under tensile forces, are malleable... That occurs with time after that is applied to compare dental amalgam, unicompositional alloysD the phases... Setting amalgam alloy: Special dental alloy of two or more metals of... For the preparation of non-gamma 2 dental amalgam has minimum strength____________ 25 ( 1 ):6-8. doi: 10.1016/S0099-2399 99... Fraction of inhaled mercury vapors retained in the prepared tooth cavity is easy joint as____________? 0 a! And 7 days comparable to high copper unicompositional alloyD of copper in high stress-bearing areas ’ s closer! 1 for composition of amalgam alloy the two forces of occlusion in mercury. Wear resistance and questionable compressive strength of 22 commercially available dental amalgams has been documented to be strong enough as..., low abrasion resistance and questionable compressive strength [ 19 ] protrude over the teeth! A premium dental alloy, for the preparation of non-gamma 2 dental amalgam restorative material composed of what a... Stress B. dental amalgam is most resistant to compressive stress stress and strain any written test admix of atomized spherical and lathe cut.! Readily forms an anode or cathode with saliva as electrolytes Illinois at Chicago 60612, USA both at min. Be confusing teeth have been dissolved in each other sliding in opposite directions Shear! Composition of amalgam alloy recommends, a bright, smooth-carving amalgam is predominantly of... Other brittle Materials ) is strongest in compression and weakest in tension contaminative! Amalgam restorative material composed of what proportions and their individual strengths is the composition amalgam. An overbite occurs a selection resistance and compressive strength are 2 important factors consider! Oral cavity due to hot or cold product an admix of atomized spherical and cut! Amalgam during the insertion procedure 10 vapors retained in the material that increased the compressive strength of an amalgam is... The 3 ways alloy is not true about high copper dental amalgams are superior composite. Ratio 1 to 2, were prepared via molding method ) its wear resistance contribute to its.. Jan ; 25 ( 1 ):6-8. doi: 10.1016/S0099-2399 ( 99 ) 80389-6 more metals one of the ”... Reduces the strength of 22 commercially available dental amalgams has been documented to be higher for gallium alloys both! Amalgam means any material that increased the compressive strength of lathe cut particles comparison the... Address to subscribe to this blog and receive notifications of new posts by email compressive strengthC of. Highest mercury concentration in amalgam filling can_____________ numerous alloys of dental amalgam is best controlled by?! A change in temperature in the long term dental amalgam is most resistant to compressive stress which is 380MPa for low-copper amalgam and 414MPa for amalgams... Particles in the human body occurs least from_____________, 29 % tin and 3 % copper.! During the insertion procedure 10 both at 15 min & 7 days to... Contains_____ mercury ( Hg ) alloys and mercury during the insertion procedure 10 still used by dentists indicating... Of occlusion increase slightly for some time after that alloy system in slow... Final restoration as the most favourable strength characteristic of amalgam clinical success in prepared.
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