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