Effect of autogenous bone graft site on dental implant survival and donor site complications: a systematic review and meta-analysis: Implant survival in autologous bone graft sites

Purpose : This systematic review and meta-analysis was undertaken to answer the following focus questions: Is the Implant survival in augmented bone utilising iliac crest bone grafts the same as while using intraoral autologous bone grafts? Is the incidence of postoperative donor site complications the same when using iliac crest bone grafts as opposed to intraoral grafts?

Basic procedures : Systematic searches of electronic databases (PubMed, Embase, CENTRAL) were performed to identify studies which reported on implant survival and postoperative complications for dental implants placed in grafted partially/completely edentulous human jaws. Studies were included if: they reported on two-piece micro-rough surface root form dental implants placed in bone-augmented completely or partially edentulous human jaws and the jaws must have been augmented with autologous bone graft materials. Time and nature of postoperative complications must have been reported. Two investigators performed data extraction and a Cohen's unweighted kappa was calculated for inter-investigator reliability. A meta-analysis was performed for extracted data on implant survival rate (ISR) in both iliac crest grafts (ICGs) and intra-oral grafts (IOGs). A qualitative analysis was performed on the information extracted on graft donor site complications. Quality assessment of the included studies were done using the Cochrane collaboration tool and the Newcastle-Ottawa scales.

Main findings : A total of 23 studies were included in the final analysis. The calculated kappa ranged between 0.77–0.89 for the literature search and identification process. 14 studies were included with data on implant survival including four randomised controlled clinical trials. The meta-analysis of included studies revealed that the ISR of dental implants placed in jaws augmented with iliac crest grafts was lower than those placed in jaws augmented with intra-oral bone grafts at 6-months [ICG = 95.8% IOG =98.4%; p<0.001], and at 120-months [ICG = 88.8%, IOG = 95.2%; p<0.001] follow-up periods. Iliac crest grafts were also frequently associated with donor site complications including pain / discomfort, gait disturbance and sensory disturbance.

Principal conclusions: This systematic review and meta-analysis demonstrates that implant survival is consistently higher in bone harvested from intraoral sites compared to iliac crest grafts. Donor site complications seemed to be a frequent finding with iliac crest grafts and mental grafts.