Then, the good results were obtained with both techniques (implants placed into fresh alveolus and implants non-submerged); these have been joined together with the objective to reduce the time of the treatment. However, the esthetic results can directly influence by the peri-implant tissue dimension (vertical or horizontal) and position in relationship of the cervical implant portion. In this way, the objective of the present study was to compare the dimensional changes of crestal bone level and peri-implant soft tissue during osseointegration of immediately exposed and submerged implants placement in fresh extraction or healed sites using a mandible dog model. The null hypothesis was the moment of implant placement after tooth extraction (immediate or after healing) or leaving the implant exposed or submerged not affecting the behavior of the peri-implant tissues.