Diederik Hentenaar

134 Chapter 6 height, but the largest increase in crown angles was measured between 1 mm and 2 mm height (see Table 3). Table 2. Clinical characteristics at baseline (T1) and 5 years (T60) T1 T60 N % N % Bleeding score 0 45 67% 45 67% 1 19 28% 17 25% 2 3 5% 5 7% Gingiva index Healthy gingiva 59 88% 65 97% Light inflammation 8 12% 2 3% Mild inflammation 0 0% 0 0% Severe inflammation 0 0% 0 0% Deepest pocket 1 1 2% 0 0% 2 19 28% 15 22% 3 34 51% 32 48% 4 6 9% 8 12% 5 3 5% 5 8% ≥6 4 5% 7 10% Table 3. Crown angle on heights 1 mm, 2 mm and 3 mm at mesial and distal implant site Height N Mean (º) Min(º) Max(º) St. Dev. Mesial 1 mm 67 0.5 º 0.0 º 19.8 º 2.8 2 mm 67 12.8 º 0.0 º 56.5 º 12.8 3 mm 67 18.0 º 0.0 º 40.5 º 11.3 Distal 1 mm 67 2.8 º 0.0 º 39.4 º 8.3 2 mm 67 16.2 º 0.0 º 53.4 º 16.0 3 mm 67 18.7 º 0.0 º 46.1 º 13.8 Marginal bone loss The average marginal bone loss between T1 and T60 was 0.14 mm ± 0.34 and 0.26 mm ± 0.47 at the mesial and distal implant sites, respectively (see Table 4). No correlation was found between the crown angles on different crown heights and marginal bone loss (Table 5).