【Yang Yeh】評論

摘自Sturdevant's art and science of operative dentistry Ch10 pp307The linear coeficient of the thermal expansion of amalgam is 2.5 times greater than that of tooth structure, but it is closer to that of tooth structure than the linear coeficient of thermal expansion of composite. Although the compressive strength of high-copper amalgam is similar to tooth structure, the tensile strength is lower, making amalgam restorations prone to fracture during flexure. Usually, high-copper amalgam fracture is a bulk fracture, not a marginal fracture. All amalgams are brittle and have low edge strength. As such, the amalgam restoration must have suicient bulk (usually 1.5–2 mm in any occlusally loaded area, depending on the position within the tooth) and a 90-degree marginal configuration

【ChiuYin】評論

高銅汞齊的抗壓強度與牙齒相近高銅汞齊的抗張強度比牙齒低，所以汞合金修復體比較容易斷

【Oswalt】評論

牙齒熱膨脹係數大概 8-11amalgam22-28composite 20-50