Covey D, Schulein T M, Kohout F J
Department of Restorative Dentistry, Virginia Commonwealth University, Richmond 23298-0566.
J Am Dent Assoc. 1989 Feb;118(2):199-202. doi: 10.14219/jada.archive.1989.0226.
This study compared marginal ridge fracture resistance in two groups of teeth restored with modified Class II cavity preparations, with control groups. The results indicated that the composite resin and dental amalgam restored teeth fractured at compressive loads that were not statistically different from those of the control (unprepared, intact) teeth. The marginal ridges of the unrestored, prepared teeth were significantly weaker.
本研究比较了两组用改良Ⅱ类洞形预备修复的牙齿与对照组牙齿的边缘嵴抗折性。结果表明，复合树脂和银汞合金修复的牙齿在压缩载荷下发生骨折，与对照组（未预备、完整）牙齿相比，差异无统计学意义。未修复的预备牙齿的边缘嵴明显较弱。
