The arm will be constituted by healthy people, that need to be rehabilitated by dental implant placement.

A short implant (length 6mm; diameter 4.3) will be inserted in an edentulous site. The implant will present a surface treated with double acid etching and traditional machined collar. A definitive transgingival standard machined abutment will be immediately screwed. Four months later, prosthetic procedures will start.

The arm will be constituted by healthy people, that need to be rehabilitated by dental implant placement.

A short implant (length 6mm; diameter 4.3) will be inserted in an edentulous site. The implant will present a surface treated with double acid etching and anodized collar. A definitive transgingival anodized abutment will be immediately screwed. Four months later, prosthetic procedures will start.

The intervention will consist of placement of two types of short implants (one with traditional machined collar and one with anodized collar). After their healing period, the prosthetic rehabilitation will be made.

The marginal bone remodeling will be evaluated by Radiographic examination. Periapical radiographs will be performed using paralleling technique with a Rinn-type positioner, customized for each patient at implant placement (T0), prosthetic restoration delivery (T1), and after 12 months (T2).Peri-implant bone levels will be measured at each time point as the linear distance (in mm) between implant platform and bone crest at mesial and distal aspects of each implant. A positive value will be assigned if the bone crest is coronal to the implant platform, whereas a negative value will be assigned if the first bone-to implant contact is apical to the implant platform. All measurements will be performed by two examiners, using measuring software (Image J). Each measurement will be performed three times at three different points.

Probing Depth (PD) will be calculated as the distance (in mm) from the gingival peri-implant margin to the bottom of the peri-implant pocket.