Bone remodeling around implants placed after socket preservation: a 10-year retrospective radiological study

Int J Implant Dent. 2021 Jul 29;7(1):74. doi: 10.1186/s40729-021-00354-7.


Background: To evaluate and compare the long-term clinical and radiological outcomes of post-extraction sockets after ridge preservation either with porcine xenograft or collagen alone. Patients underwent single-tooth extraction in the posterior mandible. Fresh extraction sockets were filled with pre-hydrated cortico-cancellous porcine bone or collagen sponge. Two or 3 months later, a ridge expansion technique with immediate implant positioning placement was performed. Primary (alveolar width changes) and secondary outcomes (adverse events and long-term maintenance of buccal plate covering the implant) were evaluated.

Results: Thirty-four women and 20 men were selected: 30 implants (group A) placed into healed post-extraction sockets grafted with porcine bone and 24 (group B) into sockets filled with a collagen sponge. There was a significant loss in width in both groups from the first and second surgery (ranging between 2.7 mm and 4.5 mm). The ridge splitting with bone expansion resulted in significant long-term increases in width for both procedures and implant sites. Non-significant differences in alveolar width were registered between the groups at 10-year follow-up even if the analysis of the implant buccal bone coverage suggested that group A had significantly worst results.

Conclusions: Porcine bone group had significantly better short-term outcomes with lower long-term maintenance of the buccal plate.

Keywords: Alveolar ridge preservation; Collagen sponge; Dental implants; Split crest procedure; Xenogeneic bone substitute.

MeSH terms

  • Alveolar Bone Loss* / diagnostic imaging
  • Animals
  • Bone Remodeling
  • Bone Transplantation
  • Female
  • Follow-Up Studies
  • Humans
  • Male
  • Retrospective Studies
  • Swine
  • Tooth Socket* / diagnostic imaging
  • Treatment Outcome