Effects of crown-to-implant ratio on marginal bone level and bone density in non-splinted single implants: a cross-sectional study.

Moreover, although the incidence of peri-implantitis of the C/I ≥ 2 group (3.2%, 1/31) was slightly higher than the C/I < 2 group (1.2%, 1/86), the difference did not reach statistical significance ( p = 0.461; Table 1 ).

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