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