Young J, Sandrik J L
Angle Orthod. 1979 Apr;49(2):104-9. doi: 10.1043/0003-3219(1979)049<0104:TIOPOS>2.0.CO;2.
The main objective of the investigation was the determination of whether prestretching would decrease the rapid force loss of the elastic polymers. The results indicated that Alastik CK chains showed a significant decrease in force loss whereas the C2 chains were unaffected. Since overextending the chain to compensate for force loss during clinical placement could result in capillary bed ischemia, increasing the force loss of the CK chains must be done before application. To accomplish this the chains should be prestretched by the manufacturer or operator. An improvement in the material component or manufacturing process would provide a more lasting solution to a material for which orthodontists have found increasing use.
该研究的主要目的是确定预拉伸是否会减少弹性聚合物的快速力损失。结果表明，Alastik CK链的力损失显著降低，而C2链未受影响。由于在临床放置过程中过度拉伸链以补偿力损失可能导致毛细血管床缺血，因此在应用前必须增加CK链的力损失。为实现这一点，链条应由制造商或操作人员进行预拉伸。材料成分或制造工艺的改进将为正畸医生越来越多地使用的材料提供更持久的解决方案。
