Immediate implants in posterior extraction sites: A case series applying the dual-zone therapeutic concept with cerabone® and three-year follow-up

Bahaa A, Bahaa A M, El-Bagoury N, et al. (February 25, 2024) Cureus 16(2): e54890. DOI 10.7759/cureus.54890

Original title: Immediate Implants in Posterior Extraction Sites: A Case Series Applying the Dual-Zone Therapeutic Concept With a Three-Year Follow-Up.


To assess the efficacy of the dual-zone therapeutic technique for immediate implant placement in mandibular or maxillary premolar/molar regions.


Eleven dental implants in five patients were placed. Teeth were extracted using piezo instruments. Following debridement of the socket, implants were inserted, and the gaps around the implants were filled with small cerabone® granules to the level of the gingival margin. A custom-made screw-retained healing abutment was connected, which acted to seal the augmented socket and allow for undisturbed healing. The final restorations were delivered four to six months later, and the patients were followed up for three years. Outcomes were evaluated annually including complications, implant or prosthesis loss, marginal bone loss and peri-implant tissue health.


  • Implants were successfully maintained with no implant or prosthesis loss or any complications
  • Implants showed no bleeding or suppuration at different time points during the three-year follow-up
  • Probing pocket depths ranged from 2.5 mm to 3.5 mm
  • Marginal bone loss was minimal and ranged from 0.11 mm gain to a 0.14 mm loss during the three-year follow-up


The authors concluded that the dual-zone therapeutic technique with immediate implant placement in posterior extraction sockets showed promising results over three years.

cerabone® used to graft the implant to bone gaps together with a customized healing abutment acting as a prosthetic seal supported the preservation of the ridge dimensions.

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