4Coelho Filho CM, Coelho FO, White LW. Closing mandibular first molar spaces in adults[J]. World J Orthod,2006,7( 1 ) :45 - 58.
5Hom BM, Turley PK, The effects of space closure of the mandibular first molar area in adults[J]. Am J Orthod, 1984,85(6) :457 - 69.
6Kyung SH, Choi JH, Park YC. Miniscrew anchorage used to protract lower second molars into first molar extraction sites[J]. J Clin Orthod, 2003.37 (10) : 575 - 579.
7Giancotti A, Greco M, Mampieri G, et al. The use of titanium miniscrews for molar protraction in extraction treatment[J]. Prog Orthod,2004,5(2) :236 - 247.
8Roberts WE, Arbuckle GR, Analoui M. Rate of meaial translation of mandibular molars using implant-anchored mechanics [J]. Angle Orthod, 1996,66(5 ) :331 - 338.
9Roberts WE, Nelson CL, Goodacre CJ.Rigid implant anchorage to close a mandibular first molar extraction site[J]. J Clin Orthod, 1994,28 : 693 - 704.
10Kagami H. Correction of the mesial reclining of the second molar caused by the loss of the first molar[J]. Shiyo, 1983,31 (4):6- 14.