Effect of Cement at Crown-Abutment Margin on Peri-Implant Soft Tissue

Objectives: Effect of changing abutment design and cementation technique on peri implant soft tissue
Methods: 28 titanium implants were placed in 28 patients in the premolar maxillary region. 14 crowns were cemented with the cement applied to all axial walls while in the other 14 crowns the cement was applied on the cervical 1/3 only. In each group 7 crowns were cemented on closed abutments while the other 7 crowns were cemented on vented abutments.Treatment protocol included surgical stage where the implants were placed, prosthetic stage which included placement of abutments of different designs and then, CAD/CAM provisional crowns were fabricated and cemented. In follow- up stage; periodontal and soft tissue esthetic assessments were done at the time of provisional restoration placement (base line) then at 3months and 6months intervals
Results: Analysis of the results revealed that the effect of the abutment design (vented and closed) and cementation technique on the peri-implant tissues showed statistical significance between groups. Vented abutments with cement applied on the cervical 1/3 only showed the best peri-implant soft tissue esthetic results
Conclusions: The good esthetic behavior with the use of vented abutment and cement applied to cervical 1/3 seems to be strongly correlated to the less amount of excessive cement extruded in this group