6Frank AL. Therapy for the divergent pulpless tooth by continued apical formation [J]. J Am Dent Assoc, 1966, 72 (1) : 87-93.
7Yamamoto H, Cho S-W, Kim E-J, et al. Developmental Properties of the Hertwig's Epithelial Root Sheath in Mice [J]. J Dent Res, 2004, 83 (9) : 688-692.
9Ryan ME, Golub LM. Modulation of matrix metalloproteinase activitis in periodontitis as a treatment strategy [J]. Periodontology, 2000, 24(2) :226 - 238.
10Row KL, Jognson RB. Distibution off 3H-proline within trans-septal fibers if the rat following release of trthodontic forces[J]. Am J Anat,1990,189(2): 179 - 188.
