Abstract: Objective： To evaluate the influence of implants with different implanting depth on the marginal bone level and discuss its clinical significant. Methods： 57 patients with 146 Bicon implants in the poste- rior region were included. According to implanting depth, there were 4 groups including group A of 1 mm less below the bone level, group B of between 1mm to 2 mm below the bone level, group C of between 2 mm to 3 mm below the bone level, group D of more than 3 mm below the bone level. The marginal bone level were evaluated by means of X-ray and SPSS 17.0 software package was used for statistical analysis. Results： After 5-years functional load, there was no significant difference in crestal bone loss among four groups(P>0.05), while there was a statistical difference among four groups(P<0.05) in the relationship be- tween the marginal bone level and implant neck platform. Conclusion： There was no significant effect of Bicon implant with different implanting depth on the marginal bone resorption,but implants implanted be- low the bone level might have more chance to keep the marginal bone stabilized at or above the implant platform.

Key words: Bicon implant, implanting depth, bone resportion, marginal bone level