Purpose: To compare the connection microgaps and the bacterial infiltration of implant-abutment interfaces of two extraoral implant models. Materials and Methods: Two implant models were used: the inner connection and the flush connection types. The implant-abutment microgaps of five sets of each extraoral implant were evaluated with scanning electron microscopy. Eleven additional sets of each model design were immersed in Staphylococcus aureus cultures for 24 hours, and samples were obtained from the external surface and from the implant's internal chamber to quantify the colony-forming units. Results: Scanning electron microscopy analysis showed that microgaps of the flush connection were smaller compared with the inner connection (P < .0001), and that bacterial counts were higher at the inner connection compared with the flush connection (P < .0001). Conclusion: Within the limitations of this experimental study, it can be concluded that the flush connection model presented a smaller microgap and fewer bacterial colonies compared with the inner connection model. Schlagwörter: extraoral implants, implant-abutment interface, microbial leakage

The purpose of this case report was to assess whether patient-specific implants (PSI, Xillocs) and soft tissue flaps contribute in reconstructing large mandibular defects. Five patients whose medical situation and history were not suitable for free microvascular bone flaps received PSI implants and were subsequently evaluated. The mean follow-up time was 12 months. The excellent fit, convenient surgery, and esthetic outcome were seen as the major advantages. PSIs can, in the authors' experience, be considered as a useful alternative provided they are well embedded by viable tissue and attached to vital resection margins of the recipient bone. Schlagwörter: 3D printed titanium implant, jaw prostheses, mandibular reconstruction, osteoradionecrosis, patient-specific implant

This report describes a successful implant prosthetic rehabilitation in an atrophic left posterior mandible in a 62-year-old man using a cancellous equine bone block as grafting material. Four months later, two bone specimens were retrieved for histologic evaluation and two dental implants were placed. Computed tomography and conventional radiography showed a 5-mm mean vertical bone gain. The biopsies showed new bone formation within the cancellous portion of the blocks and no foreign body reaction. Cancellous equine bone grafts may be an effective alternative to autogenous bone and inorganic bovine bone grafting for reconstruction of the posterior mandible using the inlay technique.

Purpose: The purpose of this report is to describe a new technique to fabricate and deliver an implant-supported fixed prosthesis to the patient on the day of surgery, and to propose a protocol for the prosthodontic and dental laboratory procedures. Materials and Methods: The development of the Brånemark Novum prosthodontic protocol is reviewed, and clinical and dental laboratory assessments and methods are described. Results: The total treatment time to fabricate a permanent implant-supported fixed prosthesis in the mandible can be reduced to 1 day with the Brånemark Novum technique. The new method includes a precise surgical technique using drilling templates for predetermined implant positions, a rigid splinting of the implants immediately after placement, the use of a prefabricated titanium framework, and elimination of implant impression procedures. Conclusion: With the technique described in this report, it is possible to provide patients with a permanent implant-supported fixed prosthesis in the mandible on the day of implant surgery. Patient benefits are obvious, with drastically reduced total treatment time, lower cost, and fewer clinical visits.