Caroliene Meijndert

49 Performance of bone level implants with conical connections in the anterior maxilla two crowns at the T 60 follow-up, but these patients wished no repair or replacement. During the 5-years follow-up period, no loosening of crowns and/or abutment screws were encountered. Peri-implant bone level change Primary outcome measure was peri-implant bone level change ( Table 2 ). Mean bone level change at T 60 was minor, being -0.13±0.66 mm. Bone level change was comparable between the augmented and non-augmented group (p=0.53, Mann-Whitney U-test, Table 3 ). Since the latter was based on a subgroup calculation, a post-hoc group size determination was performed. It appeared that 428 participants should be needed in each group to calculated a significant difference, so it seems to be justified to mention that there is not a clinically relevant difference between the two subgroups. Table 2. Mean bone level change (mm±SD) from one month after crown placement (T 1 ) to 5 years after crown placement (T 60 ). Mean change T 1 -T 60 -0.13±0.66 n = 50 Implant bone loss n % 0-0.5 mm 44 88 0.6-1.0 mm 5 10 1.1-1.5 mm 0 0 1.6-2.0 mm 0 0 >2.0 mm 1 2 Largest change of mesial or distal site was used. Clinical parameters A summary of the clinical parameters is shown in Table 4 . Plaque was hardly present at the implant restorations. Thirteen patients had probing depths ≥5mm at the implant site. Of these 13 implants, 10 showed bleeding on probing (score 1-2), but minor peri- implant bone loss (0-0.5mm). One patient showed severe bleeding on probing (score 3) and >2mm bone loss on the peri-apical radiograph and was subsequently referred for peri-implantitis treatment. Calculations in Table 3 show a statistically significant deeper probing depth in the augmented group. The patient diagnosed with peri-implantitis belonged to the augmented group. 3