The purpose of this research is to study the effect of Subcrestal placement of dental
implants on marginal bone loss in immediate implantation. The research sample
comprised of 24 implants were immediately placed after extraction,12 implants have
placed at Equicrestal level (6 in the maxilla and 6 mandible) served as control group and
12 impalnts (6 in the maxilla and 6 mandible) have placed at Subcrestal level served as test
group. modified bleeding index MBI, probing pocket depth PPD and marginal bone loss
MBL Implant survival, evaluated for both groups. Mbl were 0.85 mm in control group and
1.30 mm in test group after one year of dental emplacement The results of the present
study showed that the success rate was 100% in both groups, there was no statistical
difference between the test and control regarding, MBI, while there was statistical
difference between the test and control regarding MBL, PPD. during periods of follow up .
