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  • Title: The influence of the restorative material on the mechanical behavior of screw-retained hybrid-abutment-crowns.
    Author: Yazigi C, Kern M, Chaar MS, Libecki W, Elsayed A.
    Journal: J Mech Behav Biomed Mater; 2020 Nov; 111():103988. PubMed ID: 32799134.
    Abstract:
    BACKGROUND: The use of polymers in implant dentistry is gaining popularity, as they might have several advantages due to their shock absorption capacity. PURPOSE: The aim of this study was to evaluate the performance and fracture strength of three resilient shock-absorbing polymer-based materials as well as the widely used ceramics as one-piece screw-retained implant-supported hybrid-abutment-crowns. MATERIALS AND METHODS: Forty custom-made CAD/CAM one-piece screw-retained restorations were milled out of 5 different monolithic materials (n = 8); Z: 3Y-TZP zirconia, L: lithium disilicate, P: ceramic-reinforced polyetheretherketone (PEEK), C: nano-hybrid composite resin and E: polymer-infiltrated ceramic-network. Specimens were subjected to dynamic loading for 1,200,000 cycles with integrated thermal cycling. The surviving specimens were subjected to quasi-static loading until failure. Shapiro-Wilk test was used to test for normality, and Levene test was conducted to test the homogeneity of variance. One-way ANOVA test followed by Tukey's post-hoc test were used to detect statistically significant differences between groups. RESULTS: All specimens withstood 1,200,000 cycles of thermo-dynamic loading with no signs of cracks or screw loosening. The median values of fracture strength varied from a minimum of 670 N for group E to a maximum of 2645 N for group Z. CONCLUSIONS: Fracture strength of screw-retained hybrid-abutment-crowns is influenced by the material used. Zirconia showed superior results. However, its fracture strength was comparable to that of PEEK, which additionally enjoys a shock absorbing property.
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