External marginal gap variation and residual fracture resistance of composite and lithium-silicate CAD/CAM overlays after cyclic fatigue over endodontically-treated molars

Andrea Baldi, Allegra Comba, Riccardo Michelotto Tempesta, Massimo Carossa, Gabriel Kalil Rocha Pereira, Luiz Felipe Valandro, Gaetano Paolone, Alessandro Vichi, Cecilia Goracci, Nicola Scotti*

*Corresponding author for this work

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Abstract

The purpose of this in vitro study was to evaluate the external marginal gap variation with a 3D quantitative method and the residual fracture resistance after cyclic fatigue in endodontically treated molars restored with overlays of different materials, with and without fiber postssupported buildups. Forty-eight human maxillary molars were selected, endodontically treated, prepared with standardized MOD cavities and randomly allocated into 6 study groups considering the “core strategy” (build-up with composite resin; build-up with composite resin supported by a fiber post); and the “restorative material” of the indirect adhesive overlay (GrandioBlocks, Voco; Cerasmart, GC; CeltraDuo, Dentsply). All procedures were executed according with manufacturers guidelines. Micro-CT analysis prior and after cyclic fatigue were executed, followed by scanning electron microscope analysis and fracture resistance test. The Two-Way ANOVA analysis showed that interfacial gap progression was significantly influenced by the “core strategy” (p < 0.01) but not of “restorative material” (p = 0.59). Concerning fracture resistance, “restorative material” was statistically significant (p < 0.01), while “core strategy” (p = 0.63) and the interaction (p = 0.84) were not. In conclusion, the fiber post presence within the build-up promoted a lower interfacial gap opening after fatigue, evaluated through micro-CT scans. In terms of fracture resistance, teeth restored with Cerasmart and Celtra Duo were statistically similar, but superior to GrandioBlocks.

Original languageEnglish
Article number3002
Number of pages13
JournalPolymers
Volume13
Issue number17
DOIs
Publication statusPublished - 4 Sep 2021

Keywords

  • 3D gap
  • fiber post
  • fracture resistance
  • micro-CT
  • overlay

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