Analysis of traction force in distraction osteogenesis by using strain gauges

本研究的目的是测量上颌骨牵张成骨过程中的牵引力，探讨牵引力的变化规律。微型张力计可定制，最小可达23 mm。对8例唇腭裂患者应用刚性牵引系统牵引时牵引钢丝张力进行了测量。力随每日激活量的增加而增加（P<0.01），力与激活量呈正相关（P<0.01）。此外，在所有8例病例中，通过激活期测量的双侧最大合力均为54 N。另一方面，观察到较低牵张效率的情况表明较高的张力/激活比。

The objective of this study was to make measurement of traction force and to investigate change of the force during the maxillary distraction osteogenesis. Micro tension gauge was able to be customized and minimized to 23 mm. Tension of traction wires was measured in 8 cleft lip/palate patients treated by using rigid external distraction system. The force increased with daily activation (p<0.01) ; the force showed positive correlation with the amount of activation (p<0.01). Moreover, the maximum total force of the both sides measured through activation period within all 8 cases was 54N. On the other hand, a case in which the lower distraction efficiency was observed demonstrated the higher tension/activation ratio.