Detailed data of the included studies.

NM – not mentioned; G1 – group flapless surgery; G2 – group conventional flapped surgery; NP – not performed aThe total of patients does not equal 169 because of cases treated with both protocols or in two phases of treatment in different years. bUnpublished information concerning the number of failed implants in each group was obtained by personal communication with one of the authors. In this case 3 implants were lost in the flapless group at the 6-month follow-up cThere were 60 patients at the beginning of the study, but only 52 completed the study with 1 year of follow-up dUnpublished information concerning the number of failed implants in each group was obtained by personal communication with one of the authors.