Clinical Effect Of Submerged Or Non-submerged Endosseous Implants

Objective: A randomized controlled study was conducted to observe the clinical effects of implant survival rate and marginal bone resorption on submerged or non-submerged endosseous implants.Methods:45 patients(63 implants)with individual missing tooth were observed in this randomized controlled study.All patients were collected from January 2015 to June 2017,who were treated in the department of Oral and Maxillofacial Surgery of The Second Hospital of Hebei Medical University.Patients were randomly divided into two groups: group A(submerged healing)with 20 patients,31 implants and group B(non-submerge healing)with 25 patients,32 implants.Periodontal,pulpal inflammation and open caries were treated before implantation.All patients were trained about careful oral hygiene guidance and self-administered plaque control measures.Surgical implanting operation were conducted following the outline described in the MIS implant system manual in edentulous areas.Comparing the change of the survival rate of implant,peri-implant bone level and gingival bleeding index before loading,after 6 months and 12 months of loading.Results:There was 1 failure in both groups.The implant survival rate in group A was 96.7%.and 96.9% in group B.Marginal bone level changes around implants in the two groups before loading were group A 0.467(±0.28)mm and group B 0.721(±0.32)mm,statistical analysis showed that there were significant differences between the two groups(P=0.001).Marginal bone level changes around implants in the two groups were group A 0.699(±0.23)mm and group B 0.795(±0.35)mm after loading 6 months,group A 0.920(±0.21)mm and group B 0.981(±0.34)mm after loading 12 months respectively.Statistical analysis showed that the marginal bone loss of implants with non-submerged healing before loading was significantly higher than that with submerged healing,but after loading for 6 months,the marginal bone loss of the two groups tended to be close,while after loading for 12 months,the results of the two groups were close to similar.There was no significant difference in the gingival bleeding index between group A and group B.Conclusion:The effects of submerged or non-submerged healing on the marginal bone loss of the endosseous implant with bone horizontal internal connection were different before loading,but the results were similar after 6 months and had no significant effect on the long-term effect.Non-submerged healing can be used as a conventional implantation method for MIS implants,or as a reference for the implantation method of screwed cone-shaped bone horizontal implants.