Porosity: If time lapse between trituration and condensation is more, porosities are more and strength is less. As a general rule, smaller amalgam condenser are used first. It has been shown that amalgam condensation under or close to in vivo conditions revealed condensation pressures significantly below those mentioned above (1, … 2. bruxism. • Spherical amalgam - light condensation pressure produces adequate strength. Preserving unsupported enamel may facilitate matrix placement and improve amalgam condensation (Fig. a. 5) Amalgam is carried into the cavity using amalgam carrier. Place 2 coats of Varnish to clean, dry internal tooth surfaces. Carving The amalgam is overfilled into the cavity and the mercury rich surface layer is trimmed away. by clinic staf, it is highly recommended to employ your equipment service technician. 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. All moulds were overfilled, and excess amalgam was cut off with a knife. Good condensation is essential to successful amalgam restorations. 2. compressive strength 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. Which is not true about high copper amalgam alloys_____? Forces of 66.7 N (15 Lb) are recommended for condensation but it is doubtful that forces of this magnitude are used. 3. lack of enamel at the gingival cavo-surface margin. [] 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). Applying an optimum force for the condensation has a great role in the process. 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. 6) Use of suitable sized condensers (slightly smaller than cavity width). Traditional condensation techniques are recommended. 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. 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? Less effort is needed than for hand condensation. 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 … For conventional amalgam restorations, cavosurface margins of 90 degrees are needed to minimize the potential for fracturing the enamel and amalgam during function. A. A. Tooth is tender on percussion B. b. a. 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. A condenser is selected on the basis of its ability to remove excess mercury and to apply pressure needed for adaptation. 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. 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. 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 … b. The filling is carved to reproduce the tooth anatomy. The cavities in Group I received a varnish application and the condensation of high-copper amalgam. 5. Polishing •Increased smoothness •Decreased plaque retention •Decreased corrosion The amalgam container is always full of waste luid and a varying level of amalgam waste material. Amalgam controversy and amalgam war. More condensing force is required C. Both require same condensing force D. Manipulation is easy A load of 2.7 to 4.5 kg should be used on a 1.5 or 2-mm plugger. Less than 0.1 % C. Less than 0.01 % D. None of the above # In spherical alloys as compared to lathe cut: A. half the container. ... what is the recommended condensing increments? 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). 4. # In non zinc containing dental amalgam alloy, the percentage of zinc present is : A. The amalgam … i. Rinse and dry prep. Amalgam Management. 6-7, B). . Less than 0.02 % B. Dr. Shikha Jaiswal , Subharti Dental College, SVSU . 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. 100% amalgam waste capacity of the container is approx. Finish the cavosurface margins. Amalgam means_____? HISTORY. c. 1.5mm. No radiographic change C. Symptoms are similar to acute alveolar abscess FACTORS AFFECTING STRENGTH Condensation: • For lathe cut amalgam, greater the condensation pressure higher the compressive strength. 10. 2) Eliminating voids and reducing the amount of ... layers is impossible. 34 •Use rapid vibration •Used where high condensation forces are required. 2.7.4 Condense the amalgam with greatest confortable force. 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. [] 3. tensile strength of amalgam. Su Kung (659 AD) mentioned the use of a mixture in the Material Medica. Mechanical Condensation: Mechanical condensers provide vibration or impact type of force to pack the amalgam mix. - Therefore, the resulting freshly triturated lathe-cut amalgam requires more force during condensation than is required with spherical particles. Which of the following elements is a liquid at room temperature? [] Later, Li Shihchen (1578) chronicled a dental mixture of 100 parts mercury with 45 parts silver and 900 parts tin. The major factor influencing choices of material are moisture control (92.1%). Amalgam should be condensed in small increments with uniform force applied. triturated amalgam will form into a bright homogeneous plastic mass. 0.5 mm. A. The amalgam waste material settles at the bottom of the container and 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. 11. High tensile strength C. Low Hg: Alloy ratio D. Low creep. A. 4. inability to maintain a dry operating field For amalgam restorations, a 90 cavosurface angle accommodates the 1. condensing of amalgam. [] Dental amalgam has been used for over 150 years to fill the voids caused by tooth decay in millions of people. 1mm. Condensation is usually started at entire or spherical alloy and 45 o to walls and floors for non spherical amalgam. Dental amalgam apparently was first used by the Chinese. 3 pounds C. 35 pounds D. 25 lb. Karen L. Comisi, RDA. A. Increased force of condensation B. Although the tested amalgam … ii. During the condensation of the conventional amalgam mercury-rich material was removed before another increment was added. - 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. • Not recommended because of increased mercury levels in dental office. ... •High condensation force needed due to lathe cut ... –recommended for spherical amalgams. 15 lb B. Normally, fracture in the amalgam occurs at the grain boundaries. Recommended optimum condensation pressures were mainly derived from laboratory investigations and are between 10-20 MPa (=1-2 kp/mm^) (79). This is particularly true if a dynamic force such as RPD is applied. [] In Europe, Johannes stokers, a municipal physician in Ulm, Germany, recommended amalgam as a filling material in 1528. 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. Mercury. A force applied to the hand condenser 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. 12. 40. Low tensile and compressive strength B. What is the recommended for condensation of dental amalgam ? Proper condensation of amalgam promotes adaptation of amalgam to the cavity walls and matrix band. 4) Incremental placement and condensation. A metallic powder composed of silver, tin, copper and zinc B. List the following in order from start to finish for an Amalgam restoration. Which of the following statements apply to condensation of amalgam? Guidelines to minimize exposure to mercury and mercury vapor. Less condensing force is required B. ... La force de compression à 24 heures est de 500 Mpa et le changement dimensionnel pendant le durcissement est de -0.03%. Objectives: There is an obvious correlation between the quality of amalgam condensation and its mechanical properties. Dental Amalgam Col Kraig S. Vandewalle USAF Dental Evaluation & Consultation Service. There is a report on mercury exposure and risks from dental amalgam which was released by Health Canada on November 27, 1995. Compressive strength the resulting freshly triturated lathe-cut amalgam requires more force during condensation is. Is less of the following in order from start to finish for an amalgam restoration at the grain.! And reducing the amount of... layers is impossible smaller than cavity width ) this is true. Tooth surfaces 4lb ) coats of Varnish to clean, dry internal tooth surfaces coats Varnish. Of... layers is impossible 100 % amalgam waste material settles at bottom... 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