Rock W P, Wilson H J, Fisher S E
Br J Orthod. 1985 Oct;12(4):202-7. doi: 10.1179/bjo.12.4.202.
The dimensions and force/extension characteristics of 13 commercially available orthodontic chain elastomeric materials are reported. The relationship between force and extension was not linear over the range investigated and there were two definite transition points in the curves. Over the first linear part of the curve the two-loop specimens had stiffness values from 0.9 to 1.6 N/mm. Stiffness fell as the number of loops increased so that four-loop chains produced 0.6-1.1 N/mm. One hundred per cent extension produced forces in the 4-5 N range for most specimens. It is suggested that an extension of between 50 and 70 per cent would provide the most satisfactory orthodontic force.
报告了13种市售正畸链状弹性材料的尺寸和力/伸长特性。在所研究的范围内，力与伸长之间的关系不是线性的，曲线中有两个明确的转变点。在曲线的第一个线性部分，双环试样的刚度值为0.9至1.6N/mm。随着环数增加，刚度下降，因此四环链的刚度为0.6 - 1.1N/mm。对于大多数试样，100%伸长产生的力在4 - 5N范围内。建议50%至70%的伸长能提供最理想的正畸力。
