Fracture strength of endodontically treated roots restored with zirconia post anddifferent core materials

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Objectives: The aim of this study was to investigate the effect of different core materials on the fracture strength of endodontically treated roots. Materials and Methods: Twenty-one (CAD/CAM zirconia post) posts were cemented to the central incisors with a resin cement (Rely X Unicem). After fabrication of core restorations (zirconia, resin core, resin composite), the metal crowns were fabricated on these cores and cemented with a polycarboxylate cement. Each specimen was embedded in an acrylic resin mold. A compressive load was applied on the lingual surface (2 mm below the incisal edge) at 45° angle and crosshead speed of 0.5 mm/min until a fracture occurred. Then fracture strength was measured using a universal testing machine. Data were analyzed using one-way analysis of variance and Tukey tests (p 0.05). Results: The core materials used had significant effect on fracture strength of tooth restored with zirconia post (p 0.05). The mean fracture strength values of the specimens restored with different core materials were ranked as follows: Zirconia core (480 ± 132 MPa) resin composite (344 ± 60 MPa) ≥ resin core (332 ± 89 MPa). Conclusions: Zirconia post-core system showed higher fracture strength values than resin composite and resin core groups. However, the fracture patterns observed in teeth restored with resin-based materials were more favorable than teeth restored with zirconia posts.

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Zirconia post , resin core , resin composite , fracture strength

Cumhuriyet Dental Journal

31

Cumhuriyet Dental Journal