测定正畸弓丝的弯曲弹性模量。
Determination of the flexural modulus of elasticity of orthodontic archwires.
机构信息
Independent Section of Radiology, Semmelweis University, Budapest, Hungary.
出版信息
Dent Mater. 2010 Aug;26(8):821-9. doi: 10.1016/j.dental.2010.04.007.
OBJECTIVE
To design a protocol for the determination of the flexural modulus of elasticity of wire with high accuracy and precision.
METHODS
Cantilever bending was used at long span and low loads, using a laser displacement sensor. Various wires were tested for proof-of-concept: stainless steel, Elgiloy, Wiptam and a gold alloy, with primary attention being paid to the source and magnitude of errors.
RESULTS
The moduli of elasticity were determined with a median relative error of approximately 0.15%, with a worst case of 0.56%, taking into account all measurement errors. The precision was such as to permit distinctions between the values for the wires of different thermomechanical history.
SIGNIFICANCE
The determination of the elastic modulus of wires may be made with good precision using cantilever bending providing attention is given to all sources of error. These results represent the most reliable measures of modulus of elasticity of orthodontic archwires to date.
目的
设计一种高精度、高精准度的线材弹性弯曲模数测定方案。
方法
采用长跨距和低负载的悬梁弯曲方式，利用激光位移传感器。对各种线材进行了概念验证测试：不锈钢、Elgiloy、Wiptam 和一种金合金，特别关注误差的来源和大小。
结果
考虑到所有测量误差，弹性模量的测定中位数相对误差约为 0.15%，最大误差为 0.56%。这种精度足以区分不同热机械历史的线材值。
意义
只要关注所有误差来源，使用悬梁弯曲法可以很好地精确测定线材的弹性模量。这些结果代表了迄今为止最可靠的正畸弓丝弹性模量测量值。
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