Ogiso M, Nakabayashi N, Matsumoto T, Yamamura M, Lee R R
Department of Fixed Prosthodontics, Tokyo Medical and Dental University, Japan.
J Biomed Mater Res. 1996 Jan;30(1):109-16. doi: 10.1002/(SICI)1097-4636(199601)30:1<109::AID-JBM14>3.0.CO;2-J.
We have been using dense, pure hydroxyapatite (HA) dental implants for the last 15 years and results have shown that dense HA is a chemically stable material with acceptable mechanical properties. However, due to HA's physical characteristics, particularly its brittleness, there is the risk that the implant will fail if the subsequent bone binding comprises less than one half of the root portion. To ensure greater implant success, a new cementing method has been developed that uses methacrylates for the bonding of the dense HA outer shell to the titanium (Ti) inner cylinder in a two-piece HA-cemented Ti implant. Mechanical property tests were conducted to compare the HA-cemented Ti implant bonded with this new acrylic cement with existing commercially available HA-cemented Ti implants bonded with a triethyleneglycol dimethacrylate (TEGDMA)-bisphenol-A diglycidyl ether (BisGMA compound). The vertical and horizontal compressive strength of this improved implant was respectively 3.4 and 6.1 times greater than the commercial implants. This increased strength of new acrylic cement is due to its ability to compensate for shrinkage that affects adhesion during curing, thereby providing stronger bonding.
在过去15年里，我们一直在使用致密、纯净的羟基磷灰石（HA）牙种植体，结果表明致密HA是一种化学性质稳定且具有可接受机械性能的材料。然而，由于HA的物理特性，特别是其脆性，如果后续骨结合少于根部的一半，种植体就有失败的风险。为确保更高的种植成功率，已开发出一种新的粘结方法，即在两件式HA粘结钛（Ti）种植体中，使用甲基丙烯酸酯将致密HA外壳粘结到钛内筒上。进行了机械性能测试，以比较用这种新型丙烯酸粘结剂粘结的HA粘结钛种植体与现有的用三乙二醇二甲基丙烯酸酯（TEGDMA）-双酚A二缩水甘油醚（BisGMA化合物）粘结的市售HA粘结钛种植体。这种改进后的种植体的垂直和水平抗压强度分别比市售种植体高3.4倍和6.1倍。新型丙烯酸粘结剂强度的提高归因于其补偿固化过程中影响粘结的收缩的能力，从而提供更强的粘结力。
