Kern M, Thompson V P
Department of Restorative Dentistry, Dental School, University of Maryland, Baltimore.
Dent Mater. 1994 Jan;10(1):19-25. doi: 10.1016/0109-5641(94)90017-5.
The purpose of this study was to evaluate the bond strength and bond durability of new adhesive systems (both micromechanical and chemo-mechanical) to a beryllium-free nickel-chromium alloy (NiCr).
Plexiglass tubes filled with composite were bonded to NiCr alloy discs. Groups of 24 samples were bonded using six different bonding systems. Subgroups of eight bonded samples were stored in an isotonic artificial saliva solution (37 degrees C) either for 1 d, 30 d or 150 d. In addition, the 30 and 150 d samples were thermal cycled for 7,500 or 37,500 cycles, respectively.
The bond strength of a conventional BisGMA composite to sandblasted NiCr was statistically significantly lower than that of chemo-mechanical bonding systems and decreased continuously during the storage time of 150 d. The additional use of a silane on the sandblasted alloy resulted only in a slight, statistically insignificant increase in bond strength. Statistically significantly higher and more durable bonds to NiCr alloy were achieved either with the combination of silica coating and use of a conventional BisGMA composite or with the combination of sandblasting and the use of a composite modified with a phosphate monomer. In these systems, the bond strengths were limited by the cohesive strength of the resin composites. However, a newly developed composite containing the same active phosphate monomer showed a statistically significant decrease in bond strength (cohesive strength) over storage time.
Longer-term storage times in a wet environment are needed in laboratory tests to examine the durability of bonding systems.
本研究旨在评估新型粘结系统（包括微机械粘结和化学机械粘结）与无铍镍铬合金（NiCr）之间的粘结强度和粘结耐久性。
将填充有复合材料的有机玻璃管粘结到NiCr合金圆盘上。使用六种不同的粘结系统将24个样本分为一组进行粘结。将每组8个粘结样本的亚组分别在等渗人工唾液溶液（37摄氏度）中储存1天、30天或150天。此外，30天和150天的样本分别进行7500次或37500次热循环。
传统双甲基丙烯酸缩水甘油酯（BisGMA）复合材料与喷砂处理的NiCr之间的粘结强度在统计学上显著低于化学机械粘结系统，并且在150天的储存时间内持续下降。在喷砂处理的合金上额外使用硅烷仅使粘结强度略有增加，在统计学上无显著意义。通过二氧化硅涂层与传统BisGMA复合材料的组合或喷砂处理与含磷酸盐单体改性的复合材料的组合，可实现与NiCr合金的统计学上显著更高且更持久的粘结。在这些系统中，粘结强度受树脂复合材料的内聚强度限制。然而，一种新开发的含有相同活性磷酸盐单体的复合材料在储存期间粘结强度（内聚强度）在统计学上显著下降。
在实验室测试中需要在潮湿环境中进行更长时间的储存，以检验粘结系统的耐久性。
