* Sealing coronal portion of teeth under endodontics treatment. - Composition, structure and properties of different cement bases. * Temporary restoration in emergency treatments. The cavity was prepared with the air turbine having plenty of water irrigation. 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. Methods: For 42 months, and authors followed two groups of subjects who had amalgam restorations placed in a previous study. 2. decrease marginal leakage. • 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. * High compressive strength- … * Excellent physical properties due to added unique polymer reinforcing agents. - … 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. Massler7 showed that the base under an amalgam restoration should inhibit penetration of mercury into the underlying dentine and thus prevent dis- coloration of the tooth. Total restoration replacement is the most common treatment for defective amalgam restoration and represents a major part of restorative dental treatment. The use of cavity varnish under an amalgam restoration will 1. have a bactericidal effect. Low-copper amalgam commonly consists of mercury (50%), silver (~22–32%), tin (~14%), zinc (~8%) and other trace metals.. Dental amalgam is a liquid mercury and metal alloy mixture used in dentistry to fill cavities caused by tooth decay. study the stress induced in a Class 1 amalgam restoration when supported by bases of vary-ing materials and thicknesses. 3. stimulate secondary dentine formation. 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. * As a base under amalgam and non resin restorations. 4. decrease tooth discolouration. 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. 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. 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. 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. 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