[目的]探讨低强度激光照射对正畸牙移动的影响。[方法]采用低强度激光对20例对称拔除第一前磨牙的病例在尖牙向远中移动的过程中进行照射,1次/周,20 m in/次,共照射4次,右侧为实验侧,左侧为对照侧。在尖牙移动后7、14、21和28 d时,在石...[目的]探讨低强度激光照射对正畸牙移动的影响。[方法]采用低强度激光对20例对称拔除第一前磨牙的病例在尖牙向远中移动的过程中进行照射,1次/周,20 m in/次,共照射4次,右侧为实验侧,左侧为对照侧。在尖牙移动后7、14、21和28 d时,在石膏模型上测量尖牙远中移动的距离,并进行统计学的分析。[结果]实验侧尖牙远中移动的距离均大于对照侧,经过t检验,第7、14、21、28天,P值均<0.01,与对照侧尖牙远中移动的距离相比,差异具有显著性意义。[结论]低强度激光照射能有效的加速正畸牙齿的移动,缩短正畸治疗的疗程。展开更多
Stimulated raman scattering (SRS) is an effective method for expanding the spectral range of high power lasers, especially in the regime of near IR and middle IR. We report the SRS of high pressure H2 with a multipl...Stimulated raman scattering (SRS) is an effective method for expanding the spectral range of high power lasers, especially in the regime of near IR and middle IR. We report the SRS of high pressure H2 with a multiple-pass cell configuration. The SRS with the multiple-pass cell configuration is found to be very efficient for reduction of threshold of the first Stokes (S1). Due to the coherent SRS (CSRS) process, the multiple-pass cell configuration is more effective for reduction of the threshold for the second Stokes (S2) SRS and for increasing the conversion efficiency of S2. This contributes to the relatively low conversion efficiency of S1 for the multiple-pass cell configuration. Multiple-pass cell SRS is also found to be very effective for improving the beam quality and the stability of S1.展开更多
文摘[目的]探讨低强度激光照射对正畸牙移动的影响。[方法]采用低强度激光对20例对称拔除第一前磨牙的病例在尖牙向远中移动的过程中进行照射,1次/周,20 m in/次,共照射4次,右侧为实验侧,左侧为对照侧。在尖牙移动后7、14、21和28 d时,在石膏模型上测量尖牙远中移动的距离,并进行统计学的分析。[结果]实验侧尖牙远中移动的距离均大于对照侧,经过t检验,第7、14、21、28天,P值均<0.01,与对照侧尖牙远中移动的距离相比,差异具有显著性意义。[结论]低强度激光照射能有效的加速正畸牙齿的移动,缩短正畸治疗的疗程。
基金Supported by the National Natural Science Foundation of China under Grant Nos 11304311 and 11475177
文摘Stimulated raman scattering (SRS) is an effective method for expanding the spectral range of high power lasers, especially in the regime of near IR and middle IR. We report the SRS of high pressure H2 with a multiple-pass cell configuration. The SRS with the multiple-pass cell configuration is found to be very efficient for reduction of threshold of the first Stokes (S1). Due to the coherent SRS (CSRS) process, the multiple-pass cell configuration is more effective for reduction of the threshold for the second Stokes (S2) SRS and for increasing the conversion efficiency of S2. This contributes to the relatively low conversion efficiency of S1 for the multiple-pass cell configuration. Multiple-pass cell SRS is also found to be very effective for improving the beam quality and the stability of S1.