Study	Reason for exclusion
Di Carlo 2008	No outcome of interest reported.
Francetti 2004	Dealing with healing of tissue on submerged implants, outside the question of the review.
Jeffcoat 1995	Problems with data. It is unclear how many patients in each study group and although author replied to letter requesting further information this is still unclear.
Kokosi 2000	Insufficient information presented. Written to authors but no reply.
Lauciello 1993	Insufficient information presented. Written to authors but no reply.
Lavigne 1994	Problems with data. 8 patients all having 3 treatments, but number was 10 for each group. Written to author but no reply.
Paolantonio 2008	Problems with data. No data at baseline and at 6 months divided by groups. Written to author but no reply.
Porras 2002	Problems with data. Implants and not patients were the unit of the statistical analyses. Written to authors but no reply.
Renvert 2008	Problems with data. Implants and not patients were the unit of analyses.The author was unable to provide data at patient level.
Simoncic 2000	Insufficient information presented. Written to authors but no reply.
Tarpey 1996	Insufficient information presented. Written to authors but no reply.
Truhlar 2000	Problems with data. Study designed as cluster randomised controlled trial, however data analysed and means and standard deviation (SD) presented on implant basis, ignoring centres. Written to authors requesting new data, but no reply.
Yalcin 2002	Insufficient information presented. Written to authors but no reply.