2George F. The esthetic challenge of adjacent implants [J]. J Oral Maxillofac Surg, 2007, 65 (7) :2-12.
3Adell R, Lekholm U, Rockler B, et al. A 15-year study of osseointegrated implants in the treatment of the edentulous jaw [J]. Int J Oral Surg,1981, 10(6): 387-416.
4Abrahamsson I, Berglundh T, Wennstro J, et al. The peri-implant hard and soft tissues at different implant systems. A comparative study in the dog[J]. Clin Oral Implants Res, 1996,7(3):212-219.
5Tarnow DP, Cho SC, Wallace SS.The effect of interimplant distance on the height of inter-implant bone crest [J]. J Periodontol, 2000,71(4):546-549.
6Zarb GA, AlbrektssonT. Consensusreport:towards optimized treatment outcomes for dental implants[J]. Int J Prosthodont, 1998,80(6):641.
7Albrektsson T, Zarb G, Worthington P, et al, The long- term efficacy of currently used dental implants: a review and proposed criteria for success[J]. Int J Oral Maxillofac implants,1986,1(1):11-25.
8Hemann JS, Cochran DL, Nummikoski PV, et al. Crestal bone changes around titanium implants. A radiographic evaluation of uploaded nonsubmerged and submerged implants in the canine mandible[J]. J Periodontal, 1997,68 (11):1117-1130.
9Lazzara RJ, Porter SS. Platform switching: a new concept in implant dentistry for controlling postrestorative crestal bone levels [J]. Int J Periodontics Restorative Dent,2006, 26(1):9-17.
10Hermann JS, Schoolfield JD, Nummikoski PV, et al. Crestal bone changes around titanium implants: a methodologic study comparing linear radiographic with histometric measurements[J]. Int J Oral Maxollofac Implants, 2001, 16(4):475-485.
