Burrow M F, Tagami J, Negishi T, Nikaido T, Hosoda H
Tokyo Medical and Dental University, Department of Operative Dentistry, Japan.
J Dent Res. 1994 Feb;73(2):522-8. doi: 10.1177/00220345940730020701.
Tensile bond strength tests are commonly used for the evaluation of adhesive dental materials. The majority of these tests are carried out after 24 h of storage in water. However, determination of the early tensile bond strength could be more important, especially in relation to gap formation between the cavity surface and the restorative material. This study investigated the tensile bond strengths of five enamel/dentin bonding systems and two experimental dentin bonding systems. Tensile bond strengths were obtained at one min, ten min, and 24 h after the resin composite was cured. Bond strengths at the early stages were always somewhat less than the 24-hour test results. For the enamel/dentin bonding systems, a significant difference was found between the enamel and dentin bond strengths at all time periods, except with Superbond D-liner and Liner Bond. The experimental group with glyceryl methacrylate as the primer produced a good 24-hour result (14.3 MPa), but the early bond strengths were no different from those in the non-primer-treated groups. It was concluded that this material may actually retard the polymerization of the bonding resin. Previous workers have suggested that a tensile bond strength in the order of 20 MPa is necessary for gap-free restorations to be obtained. Should this be the case, then all of the materials tested, from the aspect of early bond strength, lack the strength for prevention of gap formation, although Superbond D-liner and Liner Bond approached this hypothetical figure. These systems, Superbond D-liner and Liner Bond, also exhibit small differences between the enamel and dentin tensile bond strengths.
拉伸粘结强度测试常用于评估牙科粘结材料。这些测试大多在材料在水中储存24小时后进行。然而，早期拉伸粘结强度的测定可能更为重要，特别是与窝洞表面和修复材料之间的间隙形成有关。本研究调查了五种釉质/牙本质粘结系统和两种实验性牙本质粘结系统的拉伸粘结强度。在树脂复合材料固化后1分钟、10分钟和24小时时获得拉伸粘结强度。早期阶段的粘结强度总是略低于24小时测试结果。对于釉质/牙本质粘结系统，除了Superbond D-liner和Liner Bond外，在所有时间段内，釉质和牙本质的粘结强度之间均存在显著差异。以甲基丙烯酸甘油酯作为底漆的实验组在24小时时取得了良好的结果（14.3MPa），但早期粘结强度与未进行底漆处理的组并无差异。得出的结论是，这种材料实际上可能会阻碍粘结树脂的聚合。之前的研究人员曾提出，要获得无间隙修复，拉伸粘结强度需达到20MPa左右。倘若如此，那么从早期粘结强度方面来看，所有测试材料都缺乏防止间隙形成的强度，尽管Superbond D-liner和Liner Bond接近这一假设数值。Superbond D-liner和Liner Bond这两种系统在釉质和牙本质的拉伸粘结强度之间也显示出微小差异。
