References
Biofunctionality
About Geistlich

1   Sartori S. et al., Clin Implants Res. 14, 2003; 369–372
2   Traini T. et al., J Periodontol 78, 2007; 955–961
3   Zitzmann N. U. et al., Int J Oral Maxillofac Implants 16, 2001; 355–366
4   Pubmed / Scopus search performed 23.11.2011.