Preprint Brief Report Version 1 Preserved in Portico This version is not peer-reviewed

Functional or Nonfunctional Cusps Preservation for Posterior Onlays in Indirect Composite or Glass-Ceramic: 3D FEA Study

Version 1 : Received: 19 October 2021 / Approved: 20 October 2021 / Online: 20 October 2021 (10:00:45 CEST)

A peer-reviewed article of this Preprint also exists.

Sellan, P.L.B.; Campaner, L.M.; Tribst, J.P.M.; de Oliveira Dal Piva, A.M.; de Andrade, G.S.; Borges, A.L.S.; Bresciani, E.; Lanzotti, A.; Ausiello, P. Functional or Nonfunctional Cusps Preservation for Molars Restored with Indirect Composite or Glass-Ceramic Onlays: 3D FEA Study. Polymers 2021, 13, 3831. Sellan, P.L.B.; Campaner, L.M.; Tribst, J.P.M.; de Oliveira Dal Piva, A.M.; de Andrade, G.S.; Borges, A.L.S.; Bresciani, E.; Lanzotti, A.; Ausiello, P. Functional or Nonfunctional Cusps Preservation for Molars Restored with Indirect Composite or Glass-Ceramic Onlays: 3D FEA Study. Polymers 2021, 13, 3831.

Journal reference: Polymers 2021, 13, 3831
DOI: 10.3390/polym13213831

Abstract

Evidence regarding the effect of the onlay preparation design for different CAD/CAM restorative materials considering the preservation of cusps is lacking. Molars were 3D modeled in four preparation designs for onlay restoration: traditional design with functional cusp coverage (TFC), non-retentive design with functional cusp coverage (NFC), traditional design with non-functional cusp coverage (TNFC), non-retentive design with non-functional cusp coverage (NNFC). Restorations were simulated with two CAD/CAM restorative materials: LD – lithium disilicate (IPS e.max CAD) and RC - resin composite (GrandioBloc). A 100 N axial load was applied to the occlusal surface simulating the centric contact point. Von Mises (VM) and maximum principal (Pmax) stresses were evaluated for restorations, cement layer and dental substrate. The non-retentive preparation design reduced the stress concentration in the tooth structure in comparison to the conventional retentive design. For LD onlays, the stress distribution on the restoration intaglio surface showed that the preparation design as well as the prepared cusp, influenced the stress magnitude. The non-retentive preparation design provided better load distribution in both restorative materials and more advantageous for tooth structure. The resin composite restoration on non-functional cusp is recommended when functional cusp is preserved, in order to associate conservative dentistry and low stress magnitude.

Keywords

dental materials; finite element analysis; prosthodontics; biomechanics

Subject

MEDICINE & PHARMACOLOGY, Dentistry

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