WebDec 1, 2014 · Consistent with the fact that the use of amalgam as a restorative material is decreasing in general dental practice, 41, 42 dentists chose to replace defective restorations that had amalgam as the restorative material. Web1. Amalgam blues (staining) 2. Proximal overhangs 3. Marginal ditching 4. Voids 5. Fracture lines 6. Improper anatomical contours 7. Marginal ridge incompatibility 8. Improper proximal contacts 9. Recurrent caries-this MIGHT justify replacement (but not all of them)

A comparative study of bonded and non-bonded amalgam

Dental amalgam is a liquid mercury and metal alloy mixture used in dentistry to fill cavities caused by tooth decay. Low-copper amalgam commonly consists of mercury (50%), silver (~22–32%), tin (~14%), zinc (~8%) and other trace metals. Dental amalgams were first documented in a Tang Dynasty medical text … See more There are, according to Geir Bjørklund, indications that dental amalgam was used in the first part of the Tang Dynasty in China (AD 618–907), and in Germany by Strockerus in about 1528. Evidence of a dental amalgam … See more Dental amalgam is produced by mixing liquid mercury with an alloy made of silver, tin, and copper solid particles. Small quantities of zinc, … See more Amalgam is a mixture of two or more metals (alloy) with mercury which has been purified first by distillation to remove impurities. Currently, major components of the alloy are silver, … See more Amalgam is tolerant to a wide range of clinical placement conditions and moderately tolerant to the presence of moisture during placement. In contrast, the techniques for composite resin placement are more sensitive to many factors. Mercury has … See more To fabricate an amalgam filling, the dentist uses a mixing device to blend roughly equal parts (by mass) of shavings of a silver-base alloy with mercury until the shavings are thoroughly wetted. The silver alloy is typically 40–70% Ag, 25-29% Sn, 2–40% Cu and … See more γ : Ag3Sn (mechanically the strongest) γ1 : Ag2Hg3 (major matrix phase in set amalgam) γ2 : Sn8Hg (weakest phase, corrodes easily) β : … See more Dental amalgam does not by itself bond to tooth structure. This was recognized as a shortcoming by early practitioners such as Baldwin. He recommended that the prepared cavity be … See more gluten free pumpkin cheesecake easy

Effect of Residual Mercury Content on Creep in Dental …

WebDec 1, 2014 · Objectives. To evaluate how restoration characteristics are associated with the decision to repair or replace an existing restoration. The following hypotheses were … Web(Ditching, Recurrent caries, Dislodged amalgam restoration and Cervical overhang of amalgam and fractured cusp occurred in that descending order accounting for 70.9%. 13.5%, 9.0%, 3.0%, 2.4%, 1.2%, respectively. The pattern was repeated when the reasons given for replacement of WebThere was a total of sixty six class V amalgam restoration out of which 28 were placed due to primary caries, cervical abrasion was 28(42.4%) each while fractured restoration and … boldon chinese