摘要
目的：分析唇舌侧托槽转矩控制性能的差异,同时探讨不同材质不同尺寸的弓丝对舌侧托槽转矩控制的影响规律。方法：建立左上尖牙到右上尖牙的唇舌侧托槽三维有限元模型,在弓丝尺寸及材质不同的情况下,模拟临床左上中切牙转矩加载±20°。结果：随着转矩角度的增大,唇舌侧托槽转矩值逐渐增大,舌侧托槽转矩值为唇侧托槽的3～5倍;0.48 mm×0.64 mm弓丝的转矩值大于0.43 mm×0.64 mm;弓丝尺寸相同时,不锈钢丝（SS）,β-钛丝（TMA）,镍钛丝（Ni Ti）,转矩值依次减小。结论：唇舌侧托槽转矩均随着转矩角度和弓丝的弹性模量的增大而增大;在相同的转矩角度下,舌侧托槽产生的转矩值大于唇侧托槽;舌侧托槽的转矩值与弓丝尺寸及材质有关。
Objective： To analyse the difference of torque performance between lingual and labial brackets as well as the influence of the archwires of different materials with different dimension on the torque capability of lingual brackets. Methods： The 3D finite model of lingual and labial brackets from the right upper canine to the left upper canine was established,all brackets were with 0. 56 mm slot size. The center of the bracket slot of the left upper central incisor was used as the central point and the two brackets were rotated clockwise and counterclockwise with a rotation angle of ± 20° along the horizontal axis of bracket slot. The torque load on the left upper central incisors with different materials and dimensions of the archwires was simulated. Results： The torque force of both lingual and labial brackets increased with the increase of rotation angle and the elastic modulus of archwire. The lingual archwire generated torque force was nearly 3- 5 times more than the labial system under the same torque angle. The torque value generated with 0. 48 mm× 0. 64 mm archwires was greater than 0. 43 mm × 0. 64 mm. The lingual bracket generated torque force decreased gradually from nickel-titanium（ Ni Ti）,Beta-titanium（ TMA） to stainless steel（ SS） under the same dimension. Conclusion： Torque moments of lingual and labial brackets both increases with the increase of torque angle in each operating condition. The lingual orthodontic brackets produce more torque force than labial brackets under the same torque angle. Torque performance of lingual bracket was affected by the material and dimension of the archwires.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2016年第3期345-349,共5页
Journal of Practical Stomatology
基金
国家自然科学基金青年基金(编号:81300903)
四川省卫生厅科研基金(编号:川卫办发[2009]464号90200)
泸州科技局-四川大学战略合作项目(编号:2013CDLZ-S22)
关键词
唇舌侧托槽
三维有限元
转矩
力学性能
Lingual and labial brackets
Torque
Three-dimensional finite element
Mechanical properties
