Tanaka E, Miyawaki Y, del Pozo R, Tanne K
Department of Orthodontics, Hiroshima University School of Dentistry, 1-2-3 Kasumi, Minami-ku, 734-8553, Hiroshima, Japan.
Arch Oral Biol. 2000 Dec;45(12):1059-64. doi: 10.1016/s0003-9969(00)00082-0.
This study was designed to investigate the relation between the biomechanical behaviour of rat interparietal sutures and expansion forces placed on them. Thirty-five 4-week-old rats were divided into four groups, a control group and three experimental groups subjected to mechanical expansion of the interparietal sutures with a tensile force for 15, 30 and 50 h. After expansion, the parietal bones, including the interparietal suture, were dissected as specimens for tensile tests. Under tension, the relaxed stress-strain plots in the control group could be better fitted by a power of 2.00, and the relaxed moduli were 0.64 and 4.51 MPa at the lower and the higher applied strains, respectively. An initial fall in the relaxed moduli at 15 h of expansion was followed by an increase over time. It is therefore suggested that the biomechanical behaviour of the interparietal sutures is influenced by the duration of an external force.
本研究旨在调查大鼠顶间缝的生物力学行为与施加于其上的扩张力之间的关系。35只4周龄大鼠被分为四组，一组为对照组，另外三组为实验组，对其顶间缝施加拉伸力进行15、30和50小时的机械扩张。扩张后，将包括顶间缝在内的顶骨解剖作为拉伸试验的标本。在拉伸状态下，对照组的松弛应力-应变曲线能更好地用幂次为2.00拟合，在较低和较高施加应变时，松弛模量分别为0.64和4.51兆帕。在扩张15小时时松弛模量最初下降，随后随时间增加。因此表明，顶间缝的生物力学行为受外力作用持续时间的影响。
