Material
The implants used for this RCT were BTI® implants (Biotechnology Institute, Vitoria, Spain). BTI® internal implants are implants with parallel walls and conventional conical apex with internal connection of tetralobe design. They present a UnicCa® surface, which is a chemical modification with calcium ions on the triple nanoroughness. The implants presented different diameters and lengths. For the preparation of the bone bed with the expander technique, motorized expanders of the BTI® brand (Biotechnology Institute, Vitoria, Spain) were used. Primary stability was measured by RFA, using the Osstell® IDx device (Osstell®, Gothenburg, Sweden) to measure ISQ values.