3Bohon WA. Disharmony in tooth size and its relation to the analysis and treatment of malocclusion. Angle Orthod, 1958,28(2):113-130.
4Bolton WA. The clinical application of a tooth-size analysis. Angle Orthod, 1962,48(4) :504-529.
5Crossby DA,Alexander CG.The occurrence of tooth size discrepancies among different malocclusion groups.Am J Orthod Dentofacial Orthop,1989,95(6):457-461
6Saatci P, Yukay F. The effect of premolar extraction on tooth discrepancy. Am J Orthod Dentofacial Orthop, 1997,111 (4) :428-434.
7Nie Q, Lin J. Comparison of intermaxillary tooth size discrepancies among different malocclusion groups. Am J Orthod Dontofacial Orthop, 1999,116(5) : 539-544.
8Vema C, Dalstra M, Mdsen B. The rate and the type of orthodontic tooth movement is influenced by bone turnover in a rat model.Eur J Orthod, 2000,22(4) :343-352.
9Melsen B. Biological reaction of alveolar bone to orthodontic tooth movement. Angle Orthod, 1999 ,69(2) : 151-158.
10Eden JD, Waters NE. An investigation into the characteristic of the PG canine retraction spring. Am J Orthod Dentofacial Orthop, 1994,105( 1 ) :49-60.