Marginal Bone Level at 24 Months of primaconnex implants: Prospective cohort study

Aim: The aim of this prospective cohort study was to examine the crestal Marginal Bone Level (MBL) of PrimaConnex implants system (Keystone Dental, MA, USA) after 24 months from placement in a partially dentate patients. Material and Methods: Fifty-four patients (20males, 24females; mean-age 54.77 11.73), which encountered inclusion criteria, were enrolled in this study. A total of 122 implants were inserted by one operator. Sixty-two implants were placed in healed-site with a full-thickness flap surgical procedure and sixty implants were placed with a flapless procedure. Intraoral radiographs were taken using paralleling technique before surgery, at impression making and after 3, 6, 12 and 24 months. Metal-ceramic crown was cemented on the abutment of the implants after 3 months. Radiographs were blindly evaluated twice by two experienced examiners. MBL was assessed at mesial and distal levels between the implant shoulder and the first bone-to-implant contact. Periodontal-Index were also evaluated: Bleeding on Probing (BOP) and Pocket Depth (PD) Results: After 24 months, 119 implants were successfully osseointegrated and stable. Three implants were lost at 3 and 6 months after the insertion, (cumulative success rate; 97.54%). The total MBL was 0.33 0.62 mm at 3 months, 0.46 0.72 mm at 6 months, 0.70 0.86 mm at 12 months and 1.05 1.01 mm at 24 months. Figure shows MBL variation of the 2 groups. BOP and PD were stable and not different during the time and between the groups Conclusion: PrimaConnex implants showed a limited reduction of MBL, suggesting that both surgical techniques may preserve the integrity of marginal bone. MBL was within the normal range.