4Thilander B, Odman J, Jemt T. Single implants in the upper incisor region and their relationship to the adjacent teeth[J].Clin Oral Implants Res, 1999,10:346-355.
5Furumoto K. Contemporary Clinical Oral Implantology[M]. Tokyo: World Congress for Oral Implantology WCOI, 1998, 34-45, 7687 ,150-159.
7Albrektsson T, Zarh G, Worthington P, et al. The long- term efficacy of currently used dental implants: A review and proposed criteria of success[J]. Int J Oral Maxillofac Implants, 1986,1(1) : 11-25.
