This systematic review of studies1 published from 2000 to September 2012 provides a summary assessment of the survival outcomes and reported complications of screw- and cement-retained fixed reconstructions supported by dental implants.
When one- and two-piece abutments and crowns were grouped, survival and failure rate differences between these two retention systems were not found to be significant. However, isolating the results with two-piece screw-retained reconstructions showed a significantly lower estimated failure rate compared to cement-retained solutions (p=0.00). Furthermore, screw-retained restorations exhibited significantly fewer technical (7.50 vs. 9.81 events per 100 years, p=0.03) and biologic (4.81 vs. 7.01 events per 100 years, p=0.02) complications, mainly suppuration and fistula formation.
These outcomes were considered in the latest consensus statements recommending cases in which to use screw retention2.