Orthodontic buccal tooth movement by nickel-free titanium-based shape memory and superelastic alloy wire.
Orthodontic buccal tooth movement by nickel-free titanium-based shape memory and superelastic alloy wire.
复制标题
通过无镍钛基形状记忆和超弹性合金丝进行正畸颊牙移动。
作者：
A. Suzuki;H. Kanetaka;Y. Shimizu;R. Tomizuka;H. Hosoda;S. Miyazaki;O. Okuno;K. Igarashi;H. Mitani
客观化
目的：比较钛-铌-铝(Ti-Nb-Al)丝材与镍钛(Ni-Ti)丝材在正畸牙齿移动中的力学性能及应用价值。
材料和方法
用原夹具测量了膨胀弹簧的载荷挠度。在卸载过程中测量了超弹性区的梯度。将这两种合金丝组成的膨胀弹簧应用于大鼠上颌第一磨牙。用千分卡尺测量第一磨牙之间的距离。
结果
在整个挠度范围内，Ti-Nb-Al膨胀弹簧的力值小于Ni-Ti膨胀弹簧的力值。Ti-Nb-Al膨胀弹簧的初始力大小和超弹区的梯度是Ni-Ti膨胀弹簧的一半。因此，Ti-Nb-Al膨胀弹簧产生的力更轻、更连续。镍钛组的牙齿移动是循序渐进的。而Ti-Nb-Al组的牙齿移动相对平稳、连续。在植入膨胀弹簧后第17天，钛-Nb-Al组和镍-钛组的牙齿移动量差异无统计学意义。
结论
结果表明，Ti-Nb-Al钢丝具有良好的力学性能，可用于牙齿的平稳、连续移动，可作为一种实用的无镍形状记忆合金和超弹性合金钢丝替代Ni-Ti钢丝用于正畸治疗。
OBJECTIVE
To examine the mechanical properties and the usefulness of titanium-niobium-aluminum (Ti-Nb-Al) wire in orthodontic tooth movement as compared with nickel-titanium (Ni-Ti) wire.
MATERIALS AND METHODS
The load deflection of expansion springs was gauged with an original jig. The gradient of the superelastic region was measured during the unloading process. Expansion springs comprising the two types of alloy wires were applied to upper first molars of rats. The distance between the first molars was measured with micrometer calipers.
RESULTS
The force magnitude of the Ti-Nb-Al expansion spring was lower than that of the Ni-Ti expansion spring over the entire deflection range. The initial force magnitude and the gradient in the superelastic region of the Ti-Nb-Al expansion springs were half those of the Ni-Ti expansion springs. Thus, Ti-Nb-Al expansion springs generated lighter and more continuous force. Tooth movement in the Ni-Ti group proceeded in a stepwise fashion. On the other hand, tooth movement in the Ti-Nb-Al group showed relatively smooth and continuous progression. At 17 days after insertion of expansion springs, there were no significant differences between the Ti-Nb-Al and Ni-Ti groups in the amount of tooth movement.
CONCLUSIONS
These results indicate that Ti-Nb-Al wire has excellent mechanical properties for smooth, continuous tooth movement and suggest that Ti-Nb-Al wire may be used as a practical nickel-free shape memory and superelastic alloy wire for orthodontic treatment as a substitute for Ni-Ti wire.
DOI：
10.1016/0002-9416(81)90192-5
发表时间：
1981-01-01
影响因子：
3
作者：
BURSTONE, CJ
通讯作者：
BURSTONE, CJ