Clinical Success of Dental Implants placed in posterior mandible augmented with interpositional block graft: 3-year results from a prospective cohort clinical study

Publication date: Available online 4 October 2018

Source: Journal of Oral and Maxillofacial Surgery

Author(s): Simone Marconcini, Ugo Covani, Enrica Giammarinaro, Eugenio Velasco Ortega, Daniele De Santis, Fortunato Alfonsi, Antonio Barone

ABSTRACT

Purpose

The purpose of the present cohort study was to investigate the 3-year efficacy and clinical performance of implant-supported rehabilitations in posterior mandibles augmented with the sandwich osteotomy technique.

Methods

Twenty-three partially edentulous patients, who developed an atrophy of the posterior mandible with a residual ridge height between 3 and 7 mm, were treated (32 surgical sites) by means of vertical bone augmentation with interpositional equine cancellous bone blocks and porcine cortico-cancelluos bone particulate. All implants were placed 4 months after augmentation and were loaded with fixed dental prostheses. One side per patient was selected and followed up for 3 years, and the patient was the unit of analysis. Linear radiographic vertical bone gain and peri-implant marginal bone loss were assessed; secondary outcomes - complication rates after surgery, prosthesis/implant failure rates, width of keratinized mucosa, and patient satisfaction - were evaluated.

Results

All patients reported a post-operative paresthesia that recovered over a period of 2 months after augmentation procedure. The mean vertical bone gain was 5.6 mm after 4 months. Ninety-one dental implants were positioned into the augmented areas. The global 3-year survival rate was 95.5%. The mean peri-implant marginal bone loss around implants was 1.06 mm ± 0.37, 3 years after loading, whereas the width of keratinized mucosa had an overall increase of 0.39 ± 0.36 mm.

Conclusion

The results of the present 3-year study suggested high success rates for implants placed in areas augmented with the osteotomy sandwich technique. This surgical approach could be helpful in presence of a low residual vertical height in the posterior mandible prior to implant placement.

https://ift.tt/2zQOxvW