Evaluation of implant placement following ridge preservation in periodontally compromised molar extraction sockets: Three-year results of a prospective cohort study

Clin Oral Implants Res. 2022 Jul;33(7):735-744. doi: 10.1111/clr.13949. Epub 2022 May 14.


Objective: To investigate the 3-year implant-related outcomes following alveolar ridge preservation in periodontally compromised molar sockets.

Material and methods: Thirty implants were placed in 26 patients following either ridge preservation (test, n = 16) or natural healing (control, n = 14) at deficient molar extraction sites after a 6-month healing period. The need for additional augmentation procedures at implant placement was recorded. Patients were assessed for 3 years following a definitive restoration. Patient information being collected included modified plaque index, the modified sulcus bleeding index, the peri-implant probing depth clinically, and alterations of marginal bone level (MBL) radiographically.

Results: There was a 100% survival rate of implants in both groups after 3-year follow-up. During implant placement operation, 35.7% in the control group and 6.3% in the test group required additional augmentation procedures. No statistically significant differences were determined for peri-implant parameters and marginal bone levels between the two groups. The overall mean difference of MBL was 0.072 mm (95% CI [-0.279, 0.423]) during the 3 years of follow-up. The success rate was 81.2% in the test and 78.6% in the control group.

Conclusions: Implants placed into periodontally compromised molar-extracted sites after ridge augmentation resulted in comparable outcomes to implant placement at naturally healed sites after 3-year functional loading. (Chinese Clinical Trial Registry ChiCTR-ONN-16009433).

Keywords: dental implants; implant survival; marginal bone loss; socket augmentation.

Publication types

  • Clinical Trial

MeSH terms

  • Alveolar Ridge Augmentation* / methods
  • Cohort Studies
  • Dental Implantation, Endosseous / methods
  • Dental Implants*
  • Dental Implants, Single-Tooth*
  • Follow-Up Studies
  • Humans
  • Molar / surgery
  • Prospective Studies
  • Tooth Extraction / methods
  • Tooth Socket / surgery
  • Treatment Outcome


  • Dental Implants