4Felippe LA, Monteiro S Jr, Vieira LC, et al. Reestablishing biologic width with forced eruption[J].Quintessence Int, 2003,34(10): 733.
5de Waal H,Castellucci G.The importance of restorative margin placement to the biologic width and periodontal health. Part Ⅱ. Int J Periodontics Restorative Dent, 1994 ,14:70-83.
6Johnson RH. Lengthening clinical crowns.J Am Dent Assoc ,1990,121:473-476.
3Heithersay GS. Combined endodontie-orthodontic treatment of trans- verse root fractures in the region of the alveolar crest [J]. Oral Surg Oral Med Oral Pathol, 1973, 36:404.
4Oesterle LJ,Wood LW. Raising the root. A look at orthodontic extru- sion[J]. J Am Dent Assoc, 1991,122: 193-196.
5Kirzioglu Z,Karayilmaz H. Surgical extrusion of a crown-root frac- tured imam-ture permanent incisor: 36 month follow-up [J]. Dent Traumatol, 2007,23 (6) : 380-385.
6Heithersay GS.Combined endodontic-orthodontic treatment of transverse root fractures in the region of the alveolar crest[J].Oral Surg Oral Med Oral Pathol,1973,36:404-407.
7Oesterle LJ,Wood LW.Raising the root.A look at orthodontic extrusion[J].J Am Dent Assoc,1991,122:193-196.
8Kirzioglu Z,Karayilmaz H.Surgical extrusion of a crown-root fractured immature permanent incisor:36 month follow-up[J].Dent Traumatol,2007,23 (6):380-385.
9Oesterle L1,Wood LW. Raising the root. A look at orthodontic ex- trusion[ J]. J Am Dent Assoc,1991,122(7) :193 - 196.
10Kirzioglu Z, Karayihnaz H. Surgical extrusion of a crown-root frac- tured immature permanent incisor: 36 month follow-up [ J ]. Dent Traumatol,2007,23 ( 6 ) :380 - 385.
