McKinney J E, Antonucci J M, Rupp N W
National Bureau of Standards, Gaithersburg, Maryland 20899.
J Dent Res. 1988 May;67(5):831-5. doi: 10.1177/00220345880670050701.
Knoop Hardness and pin-and-disc-wear measurements were made on a commercial silver-sintered glass-ionomer cement. The objective was to determine whether the incorporation of a bonded-metal-to-glass filler would enhance durability as determined by the above measurements. As with the previous work on conventional (non-metalized) glass-ionomer cements, the specimens were preconditioned at 37 degrees C in air, water, 0.02 mol/L lactic acid (pH 2.67), and heptane. The influence of these media on the microhardness of the silver-sintered material was about the same as that on the conventional materials. Storing in air produced dehydration, which increased the hardness considerably. Heptane storage increased the hardness less, but this increase is attributed to continued curing during storage. After storage in water, the hardness was essentially unchanged; the influence of increased cure is believed to be offset by softening or plasticization from water uptake. Lactic acid produced a decrease in hardness from chemical dissolution as seen from the SEM observations. In most cases, in particular for the air-stored specimens, the wear resistance was enhanced markedly over that of the conventional materials evaluated previously. The exception was the lactic acid-stored specimens for which little, or no, improvement was observed during early periods of wear. The incorporation of silver appeared to provide lubrication, thus reducing wear. However, catastrophic failure from brittle fracture was still a problem, but its occurrence was less frequent.
对一种市售的银烧结玻璃离子水门汀进行了努氏硬度和销盘磨损测量。目的是确定加入键合金属与玻璃填料是否会如上述测量所确定的那样提高耐久性。与之前关于传统（未金属化）玻璃离子水门汀的研究一样，将试样在37摄氏度的空气、水、0.02摩尔/升乳酸（pH值2.67）和庚烷中进行预处理。这些介质对银烧结材料显微硬度的影响与对传统材料的影响大致相同。在空气中储存会导致脱水，这会显著提高硬度。在庚烷中储存使硬度增加较少，但这种增加归因于储存期间的持续固化。在水中储存后，硬度基本不变；固化增加的影响被认为被吸水导致的软化或增塑所抵消。如扫描电子显微镜观察所见，乳酸会因化学溶解导致硬度降低。在大多数情况下，特别是对于在空气中储存的试样，其耐磨性比之前评估的传统材料有显著提高。例外情况是在乳酸中储存的试样，在磨损初期几乎没有观察到改善或没有改善。银的加入似乎提供了润滑，从而减少了磨损。然而，脆性断裂导致的灾难性失效仍然是一个问题，但发生频率较低。
