摘要
目的:测量并比较多曲方丝弓(MEAW)在不同牙位间的局部载荷挠曲率,分析多曲方丝弓的力学特性。方法:用0.41 mm×0.56 mm的不锈钢方丝按Kim标准弯制MEAW弓丝中独立的"L"形曲。用Instron2343型电子万能材料力学试验机及Series IX软件在室温下对"L"形曲分别在上下颌不同牙位间进行加载和卸载实验。实验中横梁速度为1.0 mm/min,最大形变量为1.0 mm。各牙位间的待测弓丝分别取5个样本重复实验,测得各自的局部载荷挠曲率。数据用SPSS11.0软件包进行统计处理,分析其差异。结果:"L"形曲在各牙位间加载和卸载时,其局部载荷挠曲率除在尖牙、第一前磨牙间与第一、二前磨牙间相等外,在其余各牙位间均不同,前牙区大,后牙区小,差异有显著性(P<0.05)。结论:MEAW在不同牙位间的局部载荷挠曲率各不相同,由前向后递减。
Objective： To compare the regional load deflection rate （LDR） of muhiloop edgewise arch wire （MEAW） in the individual interbracket span, to understand the mechanical properties of MEAW. Methods：The stainless steel wire of 0.41 mm × 0.64 mm was bent with single L-loop of 5 different sizes as described by Kim. The LDR of each L-loop at the individual interbracket span when loading and unloading was measured by using the Instron at a crosshead speed of 1 mm/min and maximum deflection of 1.0 mm at room temperature. Five specimens were tested under each experimental condition to eliminate the possibility of changes in the physical properties of the wires as a result of the stress from repeated measurements. The date were analysed by SPSS 11.0. Results： L-loops of MEAW had different LDRs regionally, except the regional LDRs between the canine and the first premolar and that between the first and second premolar were identical and moderate, a high value for the anterior segments and a low value for the posterior segments, the difference was statistically significant （ P 〈 0.05 ）. Conclusion ： The value of regional LDR on the entire MEAW arch wire are different. It decreases from the anterior segment to posterior segment progressively.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2008年第5期643-646,共4页
Journal of Practical Stomatology
关键词
多曲方丝弓
载荷挠曲率
局部
Multiloop edgewise arch wire（ MEAW）
Load deflection rate
Regional
