关键词: 滑动阻力, 自锁托槽, 含牙周膜仿真模型

Abstract:

Abstract：Objective To investigate the difference and the laws of variation on the resistance to sliding of conventional and self-ligating brackets. Methods A maxillary simulation model with pericementum was set up according to the proportion of somatological elastic modulus. The resistance to sliding was measured by conventional brackets and self-ligating brackets and the arch wire of 0.016 and 0.018 inches NiTi wires and 0.017×0.022、0.018×0.025、0.019×0.025 inches stainless steel wires. Results The resistance to sliding was followed from the high to the low: Damon Q passive self-ligating brackets < Tomy active self-ligating brackets < conventional brackets， and the differences were significant （P < 0.05）； The resistance to sliding increased along with the increase of the diameter of archwires， except that the resistance to sliding of the 0.019×0.025 inch rectangular archwire was lower than the 0.017×0.022 and 0.018×0.025 inch ones. The differences between them were significant （P < 0.05）. Conclusion Clinically the resistance to sliding is influenced by the match of different types of brackets and the arch wire， which is important in realizing the rapid and effective movement of teeth.

Key words: resistance to sliding, self-ligating brackets, simulation model with pericementum