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二级参考文献3
1HansonH. The SPEED system a report on the development of a new Edgewise appliance. Am J Orthod 1980;78:243-65
2ShivapujaPK, Berger J. A comparatuve sutdy of conventional ligatuin and self- ligation bracket systems. Am J Orthod Dentofac Orthop 1994 ; 106: 472-80
3Hanson H. SPEED System orthodontics Strite Industries Limited. 1998 pg3
