One-stage Vertical Ridge Augmentation and Dental Implantation with Allograft Bonerings: Results 1 Year After Surgery
The aim of this study was to analyze the success rate of dental implants and the graft shrinkage rate after vertical ridge augmentation and simultaneous implantation with an allograft bonering. Fifty-one patients (81 augmentations and simultaneous implantations) were included. The bonering technique followed a standardized protocol. The alveolar ridge was prepared using a congruent trephine, and depending on the defect size, an allograft bonering with an outer diameter of 6–7 mm was placed. The height of the bonering was trimmed with a diamond disc to the required length. The average height of vertical augmentation was 5.5 mm. Implants were inserted through the bonering into the native bone of alveolar ridge. After 6 months, dental implants were exposed, and dental prosthetics were placed. Of 81 implants placed with the bonering technique, two failed during a 12-month follow-up, corresponding to a success rate of 97.5%. One year after surgery, the allograft bonering exhibited an average vertical graft shrinkage rate of 8.6%. In conclusion, the allograft bonering technique was associated with a favorable outcome, and in cases with large vertical defects, both treatment time and donor site morbidity could be reduced.
Figure 1. Initial situation before surgery. Figure 2. Crestal defect. Figure 3. Measuring the defect with a trephine drill. Figure 4. Pilot-drilling in ideal implant position. Figure 5. Ringbed preparation. Figure 6. Shortening the bonering with a diamond disc.
Figure 7. Press-fit of the bonering. Figure 8. Inserting the implant. The implant should be placed approximately 1 mm below the surface. Figure 9. Covering of the graft with bovine bone substitute material and a barrier membrane. Figure 10. Measurement of the distance implant shoulder–coronal surface of the bonering. Figure 11. X-ray 12 months after surgery.
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