Romeo E, Lops D, Margutti E, Ghisolfi M, Chiapasco M, Vogel G.;Long-term survival and success of oral implants in the treatment of full and partial arches:a 7yeaｒ　prospective study with the ITI dental implant system. Int J Oral Maxillofac Implants. 2004 ;19:247-259.
Webrich G, Bush RSR, Wegener J, Wagner W,: 5 year prospective follow-up report of the Astra Tech standard dental implant in clinical treatment.; Int J Oral Maxillofac Implants. 2001 ;16:557-562.