Titanium-zirconium narrow-diameter versus titanium regular-diameter implants for anterior and premolar single crowns: 1-year results of a randomized controlled clinical study

AimTo test whether titanium-zirconium (TiZr) 3.3mm diameter implants perform differently from titanium (Ti) 4.1mm diameter implants with respect to marginal bone level (MBL) and clinical parameters. Material and MethodsForty subjects in need of a single implant-supported crown in the anterior or premolar regions were recruited in two centres. After random allocation, either a Ti or a TiZr implant was placed. Definitive crowns were inserted 6months after implant placement. Implant survival, change in MBL, clinical parameters and occurrence of adverse events were assessed at the 1-year examination. ResultsAt 1year, 38 of the 40 included patients were examined (18 Ti and 20 TiZr implants). All the implants were in place and stable. From the implant placement to the 1-year examination, the change of MBL amounted to -0.40mm in the Ti group and -0.41mm in the TiZr group. There were no significant differences between the groups regarding the change in MBL, the clinical parameters and the occurrence of adverse events. ConclusionsThe use of TiZr implants with narrow diameter for the support of single crowns in the anterior and premolar regions leads to successful tissue integration and clinical performance over a 1-year period.