Ferracane J L, Antonio R C, Matsumoto H
J Dent Res. 1987 Jun;66(6):1140-5. doi: 10.1177/00220345870660060901.
The fracture toughness of a variety of dental composites was evaluated using notched bending specimens, with and without pre-cracks. The pre-crack simulates more accurately a sharp, natural flaw in a material than does a notch, and is standard procedure in fracture-toughness evaluation. The fracture toughness was related to the filler composition and degree of conversion in the composite resins. In general, fracture toughness was highest in the more heavily filled resins, independent of degree of conversion in the matrix. The results also show that producing a pre-crack in certain composites reduced the value of their fracture toughness compared with notched-only specimens.
使用带有和不带有预裂纹的缺口弯曲试样对多种牙科复合材料的断裂韧性进行了评估。与缺口相比，预裂纹能更准确地模拟材料中尖锐的天然缺陷，并且是断裂韧性评估中的标准程序。断裂韧性与复合树脂中的填料成分和转化率有关。一般来说，在填充量更大的树脂中，断裂韧性最高，与基体中的转化率无关。结果还表明，与仅带有缺口的试样相比，在某些复合材料中产生预裂纹会降低其断裂韧性值。
