2Rothman SL, Chaftez N, Rhodes ML, et al. CT in the preopera- tive assessment of the mandible and maxilla for endosseous im- plant surgery-work in progress [J]. Radiology, 1988, 168 (1) : 171-175.
3Villari N, Fanfani F. Diagnostic contribution of CT in implantolo- gy: use of a new Denta-Scan reconstruction program [J}. Radiol Med. 1992,83(5) :608-614.
4Holst S, Hegenbarth EA, Schlegel KA, et al. Restoration of a non- restorable central incisor using forced orthodontic eruption, imme- diate implant placement, and an all-ceramic restoration: A cli- nical report[J]. J Prosthet Dent, 2007, 98(4):251-255.
5Tselios N, Parel SM, Jones JD. Immediate placement and imme-diate provisional abutment modeling in anterior single-tooth im- p|ant restorations using a CAD/CAM application: A clinical report [J]. J Prosthet Dent, 2006, 95(3): 181-185.
6Kamalakidis S, Paniz G, Kang KH, et al. Nonsurgical management of soft tissue deficiencies for anterior single implant-supported restorations: A elinical report[J]. J Prosthet Dent, 2007, 97(1): 1-5.
7Meijer HJ, Stellingsma K, Meijnderl L, et al. A new index for rating aestheties of implant：upported single crowns and adjacent soft tissues-：he Implant Crown Aesthetie Index[J]. Clin Oral Im- plants Res, 2005, 16(6):645-649.
8Ekfeldt A, Fiirst B, Carlsson GE. Zirconia abutments for single- tooth implant restorations: A retrospective and clinical follow-up study[J]. Clin Oral hnplauts Res. 2Oll, 22(11):1308-1314.
9Bollen CM, Papaioanno W, Eldere J, et al. The influence of abutment surface roughness on plaque accumulation and peri-implant mucosi- tis [J]. Clin Oral Implants Res, 1996, 7 (3): 201-211.
10Andersson B,Taylor A, Lang BR, et al. Alumina ceramic implant abutments used for single-tooth replacement: a prospective 1- to 3- year multicenter study [J]. IntJProsthodont, 2001,14 (5) : 432-438.
