A computerized dental model was used to study the stress induced in a Class 1 amalgam restoration when supported by bases of varying materials and thickness. Under the same load, the maximum tensile stresses and deflections in the amalgam restoration increased at least threefold with a zinc oxide-eugenol base as compared with a ZnPO4 cement base. Under the same load, the maximum tensile stresses and deflections in the amalgam restoration in-creased at least threefold with a zinc oxide-eugenol base as compared with a ZnPO4 cement base. * Temporary restoration in emergency treatments. Dental amalgams were first documented in a Tang Dynasty medical text written by Su Gong (苏恭) in 659, and appeared in Germany in 1528. Low-copper amalgam commonly consists of mercury (50%), silver (~22–32%), tin (~14%), zinc (~8%) and other trace metals.. 4. decrease tooth discolouration. The use of cavity varnish under an amalgam restoration will 1. have a bactericidal effect. base under the amalgam restoration, the second group received silver amalgam restoration along cavity varnish application and the third one received the bonded silver amalgam. study the stress induced in a Class 1 amalgam restoration when supported by bases of vary-ing materials and thicknesses. The cavity was prepared with the air turbine having plenty of water irrigation. Yes, you can do a bond, but it’s a weak bond, and because the amalgam tends to “flow” a little in response to occlusal pressures, the bond would break, and I’m guessing that will happen rather soon under the heavy occlusal stresses it will experience. An amalgam restoration should not be placed close to the pulpal tissues of the tooth without the use of a liner or base (or both) between the pulp and the amalgam. Background: Despite a lack of data based on clinical research, many positive characteristics have been attributed to the placement of amalgam restorations with an adhesive resin liner. [1] , [5] , [6] However, this approach contradicts the current trend toward minimal interventional procedures to decrease the risk of pulpal injuries and save tooth structures. * Sealing coronal portion of teeth under endodontics treatment. Methods: For 42 months, and authors followed two groups of subjects who had amalgam restorations placed in a previous study. - … * High compressive strength- … 3. stimulate secondary dentine formation. - Composition, structure and properties of different cement bases. • Amalgam Currently • Light cured Ca (OH)2 liner • GIC base For indirect restoration: • A base is used to block undercuts • Preferable to be bondable to dentin to prevent dislodgement during temporization and impression taking. * Excellent physical properties due to added unique polymer reinforcing agents. 2. decrease marginal leakage. Dental amalgam is a liquid mercury and metal alloy mixture used in dentistry to fill cavities caused by tooth decay. Total restoration replacement is the most common treatment for defective amalgam restoration and represents a major part of restorative dental treatment. 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