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Strasding, Malin
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article
The influence of titanium‐base abutment geometry and height on mechanical stability of implant‐supported single crowns
Abstract
<jats:title>Abstract</jats:title><jats:sec><jats:title>Aim</jats:title><jats:p>This study aimed to investigate the influence of titanium base (ti‐base) abutment macro‐ and micro‐geometry on the mechanical stability of polymer‐infiltrated ceramic network (PICN) screw‐retained implant‐supported single crowns (iSCs).</jats:p></jats:sec><jats:sec><jats:title>Materials and Methods</jats:title><jats:p>Twelve specimens per group were used, comprising six different implant/ti‐base abutment combinations restored with PICN iSCs: Nb‐T (gingival height [GH]: 1.5 mm, prosthetic height [PH]: 4.3 mm), CC (GH: 0.8 mm, PH: 4.3 mm), CC‐P (GH: 0.8 mm, PH: 7 mm), Nb‐V (GH: 1.5 mm, PH: 6 mm), St (GH: 1.5 mm, PH: 5.5 mm), and Th (GH: 0.5 mm, PH: 9 mm). The specimens underwent thermo‐mechanical aging, and those that survived were subsequently subjected to static loading until failure. The data were analyzed using a one‐way ANOVA test followed by Tukey post hoc test (<jats:italic>α</jats:italic> = .05).</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>All specimens survived thermo‐mechanical aging without complications, namely, visible cracks, debonding, or screw loosening. Th group demonstrated the highest strength values among all the groups, with significant differences compared to Nb‐T (<jats:italic>p</jats:italic> < .05), CC (<jats:italic>p</jats:italic> < .001), and St (<jats:italic>p</jats:italic> < .001). Additionally, CC‐P group exhibited significantly superior fracture strength results compared to CC (<jats:italic>p</jats:italic> < .05) and St (<jats:italic>p</jats:italic> < .05).</jats:p></jats:sec><jats:sec><jats:title>Conclusion</jats:title><jats:p>The choice of ti‐base, particularly prosthetic height, had a significant influence on fracture resistance of PICN iSCs. Nevertheless, the height or geometrical features of the ti‐base did not exhibit a significant influence on the mechanical behavior of the iSC/ti‐base assembly under thermomechanical loading, as all specimens withstood the aging without complication or failure.</jats:p></jats:sec>