Irena Sailer

Objectives The aim of this study was to evaluate the effect of sterilization on the retention forces of lithium disilicate (LD) and polymer‐infiltrated ceramic network (PICN) crowns bonded to titanium base (Ti‐base) abutments. Materials and methods Forty LD and 40 PICN crowns were milled and then bonded to 80 Ti‐bases with two resin composite cements: Multilink Hybrid Abutment (mh) and Panavia V5 (pv) for a total of 8 groups ( n = 10). Half of the specimens (test) underwent an autoclaving protocol (pressure 1.1 bar, 121°C, 20.5 min) and the other half not (control). Restorations were screw‐retained to implants, and retention forces (N) were measured with a pull‐off testing machine. The surfaces of the Ti‐bases and the crowns were inspected for the analysis of the integrity of the marginal bonding interface and failure mode. Student's t ‐test, chi‐square test, and univariate linear regression model were performed to analyze the data ( α = 0.05). Results The mean pull‐off retention forces ranged from 487.7 ± 73.4 N to 742.2 ± 150.3 N. Sterilized groups showed statistically significant overall higher maximum retention forces ( p < .05), except for one combination (LD + mh). Sterilization led to an increased presence of marginal gaps and deformities compared to no‐sterilization ( p < .001), while no statistically significant relationship was found between failure mode and sterilization ( p > .05). Conclusions Sterilization may have a beneficial effect on the retention forces of LD and PICN crowns bonded to titanium base abutments, although it may negatively influence the integrity of the marginal bonding interface.

Objective The objectives of the study were to assess the survival, failure, and technical complication rates of implant‐supported fixed dental prosthesis (iFDPs) with pontic or splinted crown (iS p C) designs in the posterior area and compare the influence of prosthetic materials and prosthetic design on the outcomes. Methods Electronic and manual searches were performed to identify randomized‐, prospective‐, and retrospective clinical trials with follow‐up time of ≥12 months, evaluating the clinical outcomes of posterior iFDPs with pontic or iS p Cs. Survival and complication rates were analyzed using robust Poisson's regression models. Results Thirty‐two studies reporting on 42 study arms were included in the present systematic review. The meta‐analysis of the included studies indicated estimated 3‐year survival rates of 98.3% (95%CI: 95.6–99.3%) for porcelain‐fused‐to‐metal (PFM) iFDPs, 97.5% (95%CI: 95.5–98.7%) for veneered zirconia (Zr) iFDPs with pontic, 98.9% (95%CI: 96.8–99.6%) for monolithic or micro‐veneered zirconia iFDPs with pontic, and 97.0% (95%CI: 84.8–99.9%) for lithium disilicate iFDPs with pontics. The survival rates for different material combination showed no statistically significant differences. Veneered restorations, overall, showed significantly ( p < .01) higher ceramic fracture and chipping rates compared with monolithic restorations. Furthermore, there was no significant difference in survival rates (98.3% [95%CI: 95.6–99.3%] vs. 99.1% [95%CI: 97.6–99.7%]) and overall complication rates between PFM iFDPs with pontic and PFM iS p Cs. Conclusions Based on the data identified by this systematic review, PFM, veneered Zr, and monolithic Zr iFDPs with pontic and iS p Cs showed similarly high short‐term survival rates in the posterior area. Veneered restorations exhibit ceramic chipping more often than monolithic restorations, with the highest fracture rate reported for veneered Zr iFDPs.