临床使用时间对正畸镍钛弓丝机械性能的影响

山东大学学报(医学版)

临床使用时间对正畸镍钛弓丝机械性能的影响

徐建光¹，步捷²，李娜¹，宋楠¹，张君¹

（1. 山东大学口腔医学院, 济南 250012； 2. 济宁医学院，山东济宁 272013）

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-01-16 发布日期:2009-01-16
通讯作者: 张君

Time effect on the mechanical properties of orthodontic NT arch wires

XU Jianguang¹, BU Jie², LI Na¹, SONG Nan¹, ZHANG Jun¹

(1. Department of Orthodontics， School of Stomatology， Shandong University， Jinan 250012， China; 2. Jining Medical School, Jining 272013, Shandong, China)

Received:1900-01-01 Revised:1900-01-01 Online:2009-01-16 Published:2009-01-16
Contact: ZHANG Jun

摘要/Abstract

摘要： 目的评价临床使用时间的长短对弓丝机械性能的影响。方法选取山东大学口腔医学院正畸科同一时期内收治的30例上颌后牙段基本无拥挤的非拔牙矫治患者，利用三点弯曲试验装置（MTS Tytron 250， USA），检测未经使用、使用4周、8周及12周的镍钛弓丝在37?℃下的应力应变关系，应用单因素方差分析及q检验，比较4组弓丝的滞后值、平台期的载荷值。结果未经使用的弓丝平台期应力值为(1.54±0.05)N，滞后值为(0.47±0.05)N；使用4周后分别为(1.35±0.03)N和(0.61±0.03)N；使用8周之后分别为(1.38±0.07)N和(0.46±0.07)N；使用12周之后分别为(1.02±0.04)N和(0.34±0.04)N。通过单因素方差分析及q检验，每组的平台期应力值和滞后值之间均存在明显的差异（P＜0.05）。结论随着临床使用时间的增加，镍钛丝的性能有所衰减，但是使用后的镍钛矫正弓丝仍然具有超弹性。

关键词: 镍钛弓丝, 机械性能, 超弹性

Abstract: To evaluate the time effect on mechanical properties of orthodontic arch wires. Methods30 nonextraction patients treated in the department of orthodontics in Shandong University in the same time period were enrolled in this study. The threepoint bending test was used to measure the strain and stress of arch wires at 37?℃. Oneway ANOVA and q test were used to compare the lag values and platform stresses. ResultsThe platform stress of the control group was 1.54±0.05N and the lag value was 0.47±0.05N. The platform stress of wires with a 4week usage was 1.35±0.03N and the lag value was 0.61±0.03N. The platform stress of wires used for 8 weeks was 1.38±0.07N and the lag value was 0.46±0.07N. The platform stress of wires used for 12 weeks was 1.02±0.04N and the lag value was 0.34±0.04N. By oneway ANOVA and q test, there were significant differences between each group（P＜0.05）. ConclusionWith the increment of use time, the properties of arch wires are attenuated, but their elasticity is still good.

Key words: NiTi arch wire, Mechanical properties, Superelasticity

中图分类号:

R783.5

徐建光1 ，步捷2 ，李娜1 ，宋楠1 ，张君1
. 临床使用时间对正畸镍钛弓丝机械性能的影响[J]. 山东大学学报(医学版), 2009, 47(01): 85-87.

XU Jianguang¹, BU Jie², LI Na¹, SONG Nan¹, ZHANG Jun¹
. Time effect on the mechanical properties of orthodontic NT arch wires[J]. JOURNAL OF SHANDONG UNIVERSITY (HEALTH SCIENCES), 2009, 47(01): 85-87.

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