2.7.4 Condense the amalgam with greatest confortable force. 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 … 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. What is the recommended for condensation of dental amalgam ? A. [] It was the beginning of the amalgam war. Removal of Hg rich amalgam during condensation of each ... CONDENSATION PRESSURE Condensation force- 13.3-17.8N(3 to 4lb). 2. bruxism. A. Normally, fracture in the amalgam occurs at the grain boundaries. Finish the cavosurface margins. Less effort is needed than for hand condensation. Forces of 66.7 N (15 Lb) are recommended for condensation but it is doubtful that forces of this magnitude are used. 3) The force of the condensation should be towards the cavity details not towards the matrix band. High tensile strength C. Low Hg: Alloy ratio D. Low creep. Amalgam means_____? Radiographic examination shows generalized loss of the lamina dura and a “ground glass” appearance of the bone. A corrosion-resistant dental alloy is disclosed which has improved handling characteristics during the filling of a dental cavity. Proper condensation of amalgam promotes adaptation of amalgam to the cavity walls and matrix band. Polishing •Increased smoothness •Decreased plaque retention •Decreased corrosion 4) Incremental placement and condensation. Condensation is usually started at entire or spherical alloy and 45 o to walls and floors for non spherical amalgam. Porosity: If time lapse between trituration and condensation is more, porosities are more and strength is less. 10. 6-7, B). 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. # In non zinc containing dental amalgam alloy, the percentage of zinc present is : A. Less condensing force is required B. half the container. Su Kung (659 AD) mentioned the use of a mixture in the Material Medica. The amalgam waste material settles at the bottom of the container and 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. The cavities in Group I received a varnish application and the condensation of high-copper amalgam. b. 100% amalgam waste capacity of the container is approx. 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 … Amalgam should be condensed in small increments with uniform force applied. More condensing force is required C. Both require same condensing force D. Manipulation is easy 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? The major factor influencing choices of material are moisture control (92.1%). c. 1.5mm. A. A load of 2.7 to 4.5 kg should be used on a 1.5 or 2-mm plugger. Mercury. [] • Spherical amalgam - light condensation pressure produces adequate strength. A metallic powder composed of silver, tin, copper and zinc B. [] In Europe, Johannes stokers, a municipal physician in Ulm, Germany, recommended amalgam as a filling material in 1528. Condensation pressure When a given force is applied,smaller the condenser greater the pressure exerted on the amalgam. triturated amalgam will form into a bright homogeneous plastic mass. 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. ... what is the recommended condensing increments? 5. 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. Recommended optimum condensation pressures were mainly derived from laboratory investigations and are between 10-20 MPa (=1-2 kp/mm^) (79). [] Applying an optimum force for the condensation has a great role in the process. 4. inability to maintain a dry operating field For amalgam restorations, a 90 cavosurface angle accommodates the 1. condensing of amalgam. - 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. ... La force de compression à 24 heures est de 500 Mpa et le changement dimensionnel pendant le durcissement est de -0.03%. A. Tooth is tender on percussion B. 2. compressive strength of amalgam. 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. 15 lb B. b. Amalgam controversy and amalgam war. There is a report on mercury exposure and risks from dental amalgam which was released by Health Canada on November 27, 1995. It has been shown that amalgam condensation under or close to in vivo conditions revealed condensation pressures significantly below those mentioned above (1, … 3. lack of enamel at the gingival cavo-surface margin. HISTORY. 3. tensile strength of amalgam. Carving The amalgam is overfilled into the cavity and the mercury rich surface layer is trimmed away. 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. Which of the following elements is a liquid at room temperature? No radiographic change C. Symptoms are similar to acute alveolar abscess Preserving unsupported enamel may facilitate matrix placement and improve amalgam condensation (Fig. The filling is carved to reproduce the tooth anatomy. As a general rule, smaller amalgam condenser are used first. FACTORS AFFECTING STRENGTH Condensation: • For lathe cut amalgam, greater the condensation pressure higher the compressive strength. Amalgam Management. Karen L. Comisi, RDA. This is particularly true if a dynamic force such as RPD is applied. 1mm. Increased force of condensation B. 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. 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). 0.5 mm. Mechanical Condensation: Mechanical condensers provide vibration or impact type of force to pack the amalgam mix. The amalgam … For conventional amalgam restorations, cavosurface margins of 90 degrees are needed to minimize the potential for fracturing the enamel and amalgam during function. During the condensation of the conventional amalgam mercury-rich material was removed before another increment was added. A. • Not recommended because of increased mercury levels in dental office. Dr. Shikha Jaiswal , Subharti Dental College, SVSU . 6) Use of suitable sized condensers (slightly smaller than cavity width). 2) Eliminating voids and reducing the amount of ... layers is impossible. Dental amalgam has been used for over 150 years to fill the voids caused by tooth decay in millions of people. The amalgam container is always full of waste luid and a varying level of amalgam waste material. All moulds were overfilled, and excess amalgam was cut off with a knife. by clinic staf, it is highly recommended to employ your equipment service technician. Dental Amalgam Col Kraig S. Vandewalle USAF Dental Evaluation & Consultation Service. 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 0.02 % B. i. Rinse and dry prep. 40. - Therefore, the resulting freshly triturated lathe-cut amalgam requires more force during condensation than is required with spherical particles. Although the tested amalgam … Traditional condensation techniques are recommended. 4. 12. Place 2 coats of Varnish to clean, dry internal tooth surfaces. Good condensation is essential to successful amalgam restorations. A condenser is selected on the basis of its ability to remove excess mercury and to apply pressure needed for adaptation. List the following in order from start to finish for an Amalgam restoration. Dental amalgam apparently was first used by the Chinese. 34 •Use rapid vibration •Used where high condensation forces are required. Guidelines to minimize exposure to mercury and mercury vapor. Which of the following statements apply to condensation of amalgam? A force applied to the hand condenser Which is not true about high copper amalgam alloys_____? Low tensile and compressive strength B. a. . 5) Amalgam is carried into the cavity using amalgam carrier. a. [] Later, Li Shihchen (1578) chronicled a dental mixture of 100 parts mercury with 45 parts silver and 900 parts tin. 3 pounds C. 35 pounds D. 25 lb. ... •High condensation force needed due to lathe cut ... –recommended for spherical amalgams. 11. Less than 0.1 % C. Less than 0.01 % D. None of the above # In spherical alloys as compared to lathe cut: A. ii. Objectives: There is an obvious correlation between the quality of amalgam condensation and its mechanical properties. 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. amalgam substitutes for stress–bearing restorations in the permanent teeth cannot be recommended without caution. 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