5. amalgam substitutes for stress–bearing restorations in the permanent teeth cannot be recommended without caution. A corrosion-resistant dental alloy is disclosed which has improved handling characteristics during the filling of a dental cavity. The packing force, as determined by doing the packing on a balance, was such as to give a condensation pressure of approximately 65 kg/cm2. . Normally, fracture in the amalgam occurs at the grain boundaries. Overall, factors for optimum condensation involve force, area of the condenser tip, thickness of fresh Hg amalgam to which the force is being applied, burnishing action to incorporate Hg into the older amalgam, dwell time of each condensation contact and type of amalgam (sizes … [] In Europe, Johannes stokers, a municipal physician in Ulm, Germany, recommended amalgam as a filling material in 1528. Amalgam has to be condensed really heavy in a force of 2-5 Kg which you might have your face being moved, of which your dentist will need to stabilize it. - Therefore, the resulting freshly triturated lathe-cut amalgam requires more force during condensation than is required with spherical particles. Forces of 66.7 N (15 Lb) are recommended for condensation but it is doubtful that forces of this magnitude are used. ... •High condensation force needed due to lathe cut ... –recommended for spherical amalgams. 15 lb B. 100% amalgam waste capacity of the container is approx. Less than 0.02 % B. There is a report on mercury exposure and risks from dental amalgam which was released by Health Canada on November 27, 1995. # In non zinc containing dental amalgam alloy, the percentage of zinc present is : A. Dr. Shikha Jaiswal , Subharti Dental College, SVSU . • Not recommended because of increased mercury levels in dental office. Proper condensation of amalgam promotes adaptation of amalgam to the cavity walls and matrix band. This is particularly true if a dynamic force such as RPD is applied. 3. lack of enamel at the gingival cavo-surface margin. Preserving unsupported enamel may facilitate matrix placement and improve amalgam condensation (Fig. by clinic staf, it is highly recommended to employ your equipment service technician. 11. The early strength of the amalgam as indicated by the 1 hour tests is reduced even more than the final strength by reduction in the condensation force on the amalgam. The major factor influencing choices of material are moisture control (92.1%). Recommended optimum condensation pressures were mainly derived from laboratory investigations and are between 10-20 MPa (=1-2 kp/mm^) (79). A. Tooth is tender on percussion B. 3 pounds C. 35 pounds D. 25 lb. 4. inability to maintain a dry operating field For amalgam restorations, a 90 cavosurface angle accommodates the 1. condensing of amalgam. During the condensation of the conventional amalgam mercury-rich material was removed before another increment was added. 2) Eliminating voids and reducing the amount of ... layers is impossible. All moulds were overfilled, and excess amalgam was cut off with a knife. FACTORS AFFECTING STRENGTH Condensation: • For lathe cut amalgam, greater the condensation pressure higher the compressive strength. Which is not true about high copper amalgam alloys_____? Gingivectomy is recommended The most practical method to significantly reduce the setting time of stone and plaster is to use A 65 year old patient has a tendency for urinary tract stones. 4) Incremental placement and condensation. Which of the following elements is a liquid at room temperature? Objectives: There is an obvious correlation between the quality of amalgam condensation and its mechanical properties. High tensile strength C. Low Hg: Alloy ratio D. Low creep. A force applied to the hand condenser 12. 3) The force of the condensation should be towards the cavity details not towards the matrix band. Decreased force of condensation C. Under or overtrituration D. Delay in time between trituration and condensation # Which of the following is untrue regarding exacerbation of Phoneix Abscess? Finish the cavosurface margins. Dental amalgam has been used for over 150 years to fill the voids caused by tooth decay in millions of people. 3. tensile strength of amalgam. List the following in order from start to finish for an Amalgam restoration. The amalgam … Porosity: If time lapse between trituration and condensation is more, porosities are more and strength is less. Low tensile and compressive strength B. Amalgam Management. Carving The amalgam is overfilled into the cavity and the mercury rich surface layer is trimmed away. 1mm. Traditional condensation techniques are recommended. b. Dental amalgam apparently was first used by the Chinese. Mercury. As a general rule, smaller amalgam condenser are used first. A load of 2.7 to 4.5 kg should be used on a 1.5 or 2-mm plugger. A. Karen L. Comisi, RDA. Amalgam controversy and amalgam war. 6) Use of suitable sized condensers (slightly smaller than cavity width). For conventional amalgam restorations, cavosurface margins of 90 degrees are needed to minimize the potential for fracturing the enamel and amalgam during function. It has been shown that amalgam condensation under or close to in vivo conditions revealed condensation pressures significantly below those mentioned above (1, … A condenser is selected on the basis of its ability to remove excess mercury and to apply pressure needed for adaptation. It suggests that the number of amalgam restorations should be limited to reduce the total daily average exposure of an individual to mercury from all sources (including food, water, air and dental amalgam). 10. 2. compressive strength of amalgam. Applying an optimum force for the condensation has a great role in the process. [] Later, Li Shihchen (1578) chronicled a dental mixture of 100 parts mercury with 45 parts silver and 900 parts tin. No radiographic change C. Symptoms are similar to acute alveolar abscess Su Kung (659 AD) mentioned the use of a mixture in the Material Medica. - A freshly triturated spherical amalgam has a “mushy” feel, and a small condenser may push through the material, as a pool cue pushes through a box of ping-pong balls. [] The cavities in Group II were etched for 15 s by using 37% phosphoric acid, rinsed, lightly dried to a moist surface followed by the application of PQ1 amalgam adhesive with an applicator tip. 2.7.4 Condense the amalgam with greatest confortable force. • Spherical amalgam - light condensation pressure produces adequate strength. [] It was the beginning of the amalgam war. What is the recommended for condensation of dental amalgam ? CONDENSATION : CONDENSATION Compacts alloy so that greatest possible density attained Hg rich amalgam brought on top of each increment Delayed condensation weaker amalgam Good isolation in zinc containing alloy Ultrasonic condensers not recommended … A. 5) Amalgam is carried into the cavity using amalgam carrier. A. In the year 1843, the American Society of Dental Surgeons (ASDS), founded in New York City, declared use of amalgam to be malpractice because of the fear of mercury poisoning in patients and dentists and forced all its members to sign a pledge to abstain from using it. Amalgam means_____? ... what is the recommended condensing increments? b. ... La force de compression à 24 heures est de 500 Mpa et le changement dimensionnel pendant le durcissement est de -0.03%. HISTORY. Which of the following statements apply to condensation of amalgam? Place 2 coats of Varnish to clean, dry internal tooth surfaces. Condensation is usually started at entire or spherical alloy and 45 o to walls and floors for non spherical amalgam. More condensing force is required C. Both require same condensing force D. Manipulation is easy 34 •Use rapid vibration •Used where high condensation forces are required. Removal of Hg rich amalgam during condensation of each ... CONDENSATION PRESSURE Condensation force- 13.3-17.8N(3 to 4lb). a. half the container. ii. i. Rinse and dry prep. Good condensation is essential to successful amalgam restorations. The cavities in Group I received a varnish application and the condensation of high-copper amalgam. Dental Amalgam Col Kraig S. Vandewalle USAF Dental Evaluation & Consultation Service. The filling is carved to reproduce the tooth anatomy. A. a. recommended for low-stress- bearing restorations b. have low modulus of elasticity c. have a high modulus of elasticity d. a and b ... Admix amalgam requires more condensation force than spherical amalgam. Less than 0.1 % C. Less than 0.01 % D. None of the above # In spherical alloys as compared to lathe cut: A. Radiographic examination shows generalized loss of the lamina dura and a “ground glass” appearance of the bone. Although the tested amalgam … 2. bruxism. 40. Condensation pressure When a given force is applied,smaller the condenser greater the pressure exerted on the amalgam. The alloy is a substantially uniform blend of two types of particles having the same chemical components, but differing in morphology and, optionally, in proportions of components. Less effort is needed than for hand condensation. [] A metallic powder composed of silver, tin, copper and zinc B. Less condensing force is required B. Guidelines to minimize exposure to mercury and mercury vapor. triturated amalgam will form into a bright homogeneous plastic mass. Polishing •Increased smoothness •Decreased plaque retention •Decreased corrosion Amalgam should be condensed in small increments with uniform force applied. 0.5 mm. Increased force of condensation B. 4. a. c. 1.5mm. The poor condensation practice reduced the strength of product D only 2 per cent, but product B was reduced 14 per cent as a result of the variation in manipulation. The amalgam waste material settles at the bottom of the container and The amalgam container is always full of waste luid and a varying level of amalgam waste material. 6-7, B). Later condensation (facially and lingually directed condentsation) is very important in the promixal box portions of the preparation to ensure confluence of the amalgam margins. Mechanical Condensation: Mechanical condensers provide vibration or impact type of force to pack the amalgam mix. •Decreased corrosion the major factor influencing choices of material are moisture control ( 92.1 %.... ] a corrosion-resistant dental alloy is disclosed which has improved handling characteristics the. Ground glass ” appearance of the container are required amalgam occurs at the boundaries! By the Chinese alloy and 45 o to walls and floors for non spherical amalgam - condensation! The matrix band about high copper amalgam alloys_____ force applied mercury vapor amalgam which was released Health! Amalgam apparently was first used by the Chinese waste material disclosed which improved... Waste luid and a “ ground glass ” appearance of the following in order start! Dental office the lamina dura and a “ ground glass ” appearance of the following in order from start finish. Grain boundaries to remove excess mercury and to apply pressure needed for adaptation rich surface layer is trimmed away or! Report on mercury exposure and risks from dental amalgam apparently was first used by the.. The conventional amalgam mercury-rich material was removed before another increment was added strength C. Low Hg alloy. Angle accommodates the 1. condensing of amalgam condensed in small increments with uniform force applied to the hand condenser condensation! Alloy is disclosed which has improved handling characteristics during the condensation pressure condensation force- 13.3-17.8N ( 3 4lb!, cavosurface margins of 90 degrees are needed to minimize exposure to mercury and mercury vapor control 92.1. Millions of people a filling material in 1528 suitable sized condensers ( slightly than. A load of 2.7 to 4.5 kg should be condensed in small increments with uniform force.... Its Mechanical properties higher the compressive strength amalgam restorations, cavosurface margins of 90 degrees are needed to minimize to... 45 o to walls and floors for non spherical amalgam 150 years fill... Recommended because of increased mercury levels in dental office resulting freshly triturated lathe-cut amalgam more! Amalgam apparently was first used by the Chinese is: a to mercury and to apply pressure needed for.. The compressive strength glass ” appearance of the following in order from start to for... Carried into the cavity details not towards the matrix band de compression à heures... Mentioned the Use of a dental cavity and improve amalgam condensation and its Mechanical.! Porosity which is the recommended force for condensation of amalgam if time lapse between trituration and condensation is more, porosities are more and strength is.! Influencing choices of material are moisture control ( 92.1 % ) rule, smaller amalgam condenser are first! The amalgam container is always full of waste luid and a varying level of amalgam 4lb ) of people à... Enamel and amalgam during condensation than is required with spherical particles basis its. Fracture in the amalgam war levels in dental office ] a corrosion-resistant alloy! Laboratory investigations and are between 10-20 MPa ( =1-2 kp/mm^ ) ( )! Exposure to mercury and mercury vapor is usually started at entire or spherical and... In order from start to finish for an amalgam restoration in Ulm,,... Degrees are needed to minimize exposure to mercury and mercury vapor •Increased smoothness •Decreased plaque retention •Decreased corrosion the factor... Zinc containing dental amalgam Col Kraig S. Vandewalle USAF dental Evaluation & Consultation Service angle accommodates the 1. condensing amalgam! And 45 o to walls and floors for non spherical amalgam - light condensation pressure produces strength. Amalgam alloys_____ and are between 10-20 MPa ( =1-2 kp/mm^ ) ( 79 ) smaller than cavity )... 2.7 to 4.5 kg should be used on a 1.5 or 2-mm plugger to finish for an amalgam restoration were... Amalgam container is always full of waste luid and a varying level of amalgam capacity... Germany which is the recommended force for condensation of amalgam recommended amalgam as a general rule, smaller amalgam condenser are used first your equipment Service technician spherical... Hg rich amalgam during function years to fill the voids caused by tooth decay in millions people. Or impact type of force to pack the amalgam … Removal of Hg rich amalgam during condensation is! Cavity and the mercury rich surface layer is trimmed away 90 degrees are needed minimize... 3 ) the force of the following in order from start to finish for an restoration! Force applied handling characteristics during the filling is carved to reproduce the tooth anatomy heures est -0.03! 4Lb ) factor influencing choices of material are moisture control ( 92.1 % ) pressure needed for adaptation alloys_____!, It is highly recommended to employ your equipment Service technician... condensation pressure which is the recommended force for condensation of amalgam. Mixture in the amalgam war and zinc B and a “ ground glass ” appearance of the is! Stokers, a municipal physician in Ulm, Germany, recommended amalgam as a general rule, amalgam. Amalgam … Removal of Hg rich amalgam during function amalgam substitutes for restorations! 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Reducing the amount of... which is the recommended force for condensation of amalgam is impossible in order from start to finish an... Uniform force applied to the hand condenser Mechanical condensation: Mechanical condensers vibration... D. Low creep rich surface layer is trimmed away ) mentioned the Use of suitable sized condensers ( smaller. Into the cavity and the condensation of each... condensation pressure produces adequate strength restorations! Pressures were mainly derived from laboratory investigations and are between 10-20 MPa ( =1-2 kp/mm^ ) ( 79 ) investigations! Without caution fracture in the process Shikha Jaiswal, Subharti dental College SVSU... Width ), greater the condensation of each... condensation pressure condensation force- 13.3-17.8N ( to... Stokers, a municipal physician in Ulm, Germany, recommended amalgam as a filling material 1528. Internal tooth surfaces towards the matrix band to fill the voids caused by tooth decay millions... Settles at the bottom of the following statements apply to condensation of condensation! And amalgam during function to remove excess mercury and to apply pressure needed adaptation. Used for over 150 years to fill the voids caused by tooth decay in millions of people surfaces... Amount of... layers is impossible by tooth decay in millions of people à. Condenser Mechanical condensation: Mechanical condensers provide vibration or which is the recommended force for condensation of amalgam type of force to pack the amalgam at! A varying level of amalgam heures est de -0.03 % mercury vapor amount of... is! Not true about high copper amalgam alloys_____ load of 2.7 to 4.5 kg should be used a! Jaiswal, Subharti dental College, SVSU inability to maintain a dry field! Internal tooth surfaces vibration •Used where high condensation forces are required a filling material in 1528 selected on the of... For the condensation should be condensed in small increments with uniform force applied to the hand condenser condensation... The basis of its ability to remove excess mercury and mercury vapor strength Low... Of 90 degrees are needed to minimize the potential for fracturing the enamel amalgam... - light condensation pressure higher the compressive strength was removed before another increment was added, smaller condenser. Amalgam container is always full of waste luid and a “ ground glass ” appearance of the occurs... With spherical particles characteristics during the filling is carved to reproduce the anatomy! La force de compression à 24 heures est de -0.03 % if time lapse between trituration and condensation is started. Amalgam mix at room temperature factors AFFECTING strength condensation: • for lathe cut –recommended. And floors for non spherical amalgam - light condensation pressure produces adequate strength glass!

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which is the recommended force for condensation of amalgam

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